Text

Forwards Westinghouse Response to NRC Request for Addl Info on AP600.Encl 1 List Sequences,Will Be Discussed During PRA Meeting
	ML20112H074
Person / Time
Site:	05200003
Issue date:	06/07/1996
From:	Mcintyre B; WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Quay T; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	NSD-NRC-96-4742, NUDOCS 9606140324
	Download: ML20112H074 (150)
	v • d • e

.-

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Westinghouse Energy Systems Ba 355 Pittsburgh Pennsylvania 15230 0355 Electric Corporation NSD-NRC-96-4742 DCP/NRC0529 Docket No.: STN-52-003 June 7,1996 Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 ATTENTION:

T.R. QUAY

SUBJECT:

WESTINGHOUSE RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION ON TIIE AP600

Dear Mr. Quay:

Enclosed with this letter are minimum cutsets for a select number of sequences from the AP600 Level 1 PRA. The information is being provided to the NRC as preparation material for the upcoming Westinghouse /NRC PRA meeting scheduled for June 24-26,1996. Please provide a copy of the enclosures to Mr. Nick Saltos of the NRC.

! is a list of sequences that will be discussed during the PRA meeting. Provided in the left-hand margin of the enclosure is the filename associated with the particular sequence. Note that no cutsets are reported for seven of the sequences because there are no minimal cutsets above a meaningful cutoff (cutoff in the range of E-13 to E-15). contains a printout of each of the listed files which contains the minimum cutsets per sequence, in discussions held with the NRC while preparing for the meeting, the NRC requested the top 50 (or about) cutsets for each of the sequences be provided. Westinghouse has complied with that request when appropriate. For some sequences, there are less than 50 cutsets above the low cutoff of i

E-13 to E-15. Since the AP600 PRA core damage frequency is on the order of E-7, it is believed that review of cutsets with a probability lower than the cutoff is not meaningful.

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-2 June 7,1996 Please note that the cutsets provided are based on the latest Level 1 PRA which was provided to the NRC in a Westinghouse letter dated May 1,1996 as a draft mark up report.

Please contact Cynthia L. IIaag on (412) 374-4277 if you have any questions concerning this transmittal.

bxf$

Brian A. McIntyre, Manager Advanced Plant Safety and Licensing

/nja Enclosures cc:

D. Jackson, NRC (enclosures)

J. Sebrosky, NRC (without enclosures)

N. J. Liparulo, Westinghouse (w/o encisoures) i l

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, to Westinghouse Letter NSD-NRC-96-4742 June 7,1996

.M

SENENCES TO SET MININUR CUTSETS Provide top 50 cutsats for each of the* following sequences. Please useeventdesign(orabout) ators and a brief event description with the associated probability (i.e., same f>rmat as the one used in Table 33-3 of the FRA).

c h ef @le m e HIA nicx-i. bE3 1.

SGTR * /RTRIP

CYCS * /SGISO

CNT * /PRHR * / ADS-F * /ACC

NRHR

IRWST a

ae.

nicx.L brs 2.

SGTR

RTRIP

CVCS

SGISO * /CNT * /PRHR

ADS-F

ADS-P (7. SGTR

RTAIP

CVCS

SGISO

RCL * /PRHR

ADS-F

ADS-P

" Wh i

4.

SGTR

RTRIP

CYCS * /SGISO

RCL * /PRHR * / ADS-E

ACC M fo M L _14 SGTR

RTRIP.* CYCS

SGISO * /CNT * /PRHR * / ADS-Fi* /ACC

NRHR

IRWST CONTE 00tNTIAL SGTR (Lc 5G -O L bE s 1.

SLB-V*/RTRIP " $GTR * /CMT * /PRNR * / ADS-F * /ACC

NRHR

IRWST 2.

(LMFW or LOSP

R05 or LCAS or LCOND or LCCW

MFW or TRANS

MFW or ne g

pf

'LMFW1

MFW) * /RTRIP

SLSOY

SGTR

PRHR * /CMT

ADS-F

ADS-P STUCK-0 PEN SECONDAR" SIDE SAFETY VALVE

.- SLB-V * /RTRIP " NSGTR * /PRNR * (CMT or RCL) *CVCS

ADS-F

ADS-P l

wo 4[,

2.

SL8-V * /RTRIP " NSGTR * /PRHR * (CMT or RCL)

CVCS * / ADS-F * /ACC OM I

NRHR

IRWST i

[ 3_.

SLB-V * /RTRIP " NSGTR * /PRHR * (CMT or RCL)

CVCS * / ADS-F

ACC j

i 1

LDDE l

4 A L O 5 - I o. b E_5 1.

LOSP * /RTRIP

R05 * /0 GEN * /SLS0V

SFW

PRHR * /PR$0V * /CNT

ADS-F

ADS-P 2 eto s - 07. be.s 2.

LOSP * /RTRIP

R05 * /DGEN * /SLSOY

SFW

PRHR * /PRSOY * /CMT *

/ ADS-F

NRHR

IRWST 2 L Lo 5 -06 M s 3.

LOSP * /RTRIP

R05 * /DGEN * /SLSOY

SFW

PRHR * /PRSOY * /CMT *

/ ADS-F

NRHR * /!RVST

RECIR LOSS OF MAIN FEEDWATER (LMFW)

( A LMF, I P hE.S 1.

LNFW * /RTRIP * /SLSOV

SFW

PRHR * /PR$0V * (CMT or RCL)

ABS-F

ADS-P i A L MF- 09. bES 2.

LMFW*/RTRIP* /SL50V

SFW

PRHR * /PRSOY * /CMT

ADS-F

ADS-P.

GIES

'/Of 20 MM numbered I to 7 and 10 to 12 in Table 33-4 of the PRA Sequenses,dditionalcutsets than what already provided for each of these (provide a g pgr sequences).

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. to Westinghouse Letter NSD-NRC-96-4742 l

June 7,1996 l

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File: 1ALCF 09. DES Cre:ted: Fri May 24 16:20:26 1996 Page 1 sf 2 Length: 14966 byt?S Queued: Fri M y 25 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1

Title:

AP600 7 File: 1ALMF 09 WLK ( WLINK2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PROBABILITY INCREASED)

Reduced Sum of Cutsets: 1.3060E-11 i

NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

2.69E 12 20.60 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FA! LURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX-TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS COND. PROS. OF REC *MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E-03 ADX MV Go OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 1

2 2.69E-12 20.60 INITIATING EVENT - Loss OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ADX-MV Go OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 3

1.88E 12 14.40 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3.84E-05 CMX VS-FA 4

1.20E-12 9.19 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMEN!

4.78E 04 CCX-TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS 4

COND. PRON. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC COMMON CAUSE FA4 LURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E-03 ADX-MV GO OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR (SLOCA/ TRANSIENT) 1.34E-03 LPM MAN 01 5

1.20E-1k 9.19 !NITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURF ENVIRONMENT 4.78E-04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC COMMON CAUSE FAILURE OF 4/4 STAGE 2 8 3 LINE MOVs TO OPEN 1.10E 03 ADX-MV-GO OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/TRANS!ENT) 1.34E 03 LPM MAN 01 6

7.19E 13 5.51 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR COMMON CAUSE FAILURE OF TEMP SENSORS 1.1TE-04 CCX-TT-UF COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E 05 CMX-VS-FA 7

7.13E 13 5.46 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02-REC MANDAS COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E 05 CMX-VS FA 8

6.15E-13 4.71 INITIATING EVENT - LOSS OF MAIN FECDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION

~

1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E-05 CMX VS FA 9

5.90E 13 4.52 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR COMMON CAUSE FAILURE O! PRHR ADVs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E-05 CMX VS FA 10 1.62E-13 1.24 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX-TRNSM EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3M0007 COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ADX-MV-GO OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 11

'1.62E 13 1.24 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.0$E 04 ED3 MOD 07 COMMON CAUSE FAILURE OF.4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E-03 ADX-MV-Go OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 12 7.20E 14

.55 INITIATING EVENT - LOS$ OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRES $URE ENVIRONMENT 4.78E 04 CCX-TRNSM

File: 1ALIF-09. DES Crseted: Fri Msy 24 16:20:26 1996 Page 2 of 2 Length: 14966 bytss Queued: Fri M;y 24 17:23:02 1996 EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 COMMON CAUSE FAILURE OF 4/4 ETAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ACX MV GO OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM MAN 01 13 7.20E 14

.55 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E*04 ED3M0007 COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ADX MV G0 OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM MAN 01 14 6.79E-14

.52 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E 04 ED3M0001 STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E-02 E03M0004 COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E 05 CMX VS FA 15 5.32E-14

.41 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSOR $ IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX TRNSM FAILURE OF AUTOM ifC DAS FUNCTION 1.00E-02 CAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ADX MV GO

)

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 16

'5.32E-14 41 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E-03 ADX MV GO nPf8ATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 17 4.48E 14

.34 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR BATTERf DB1 UNAVAILABLE 2.70E-03 ED3M0003 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E 05 CMX VS-FA j

18 4.04E-14

.31 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW f

COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMik I

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3 MOD 04 BUS EDS3 DS i UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSDS1TM COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E-05 CMX VS FA 19 2.36E 14

.18 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OL JRS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SELSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ADX-MV GO OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM MAN 01 20 2.36E-14

.18 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs 70 OPEN 1.10E 03 ADX-MV-Go OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM-MAN 01

i Fitz: 1ALMF 18. DES Crs:ted: Fri May 24 16:20:34 1996 Page 1 of 3 Length: 23214 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Titts: AP600 7 File: 1ALMF 18.WLK ( WLINK2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PROBABILITY INCREASED)

Reduced Sun of Cutsets: 2.1850E 10 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

1.23E-10 56.29 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3 MOD 07 2

4.66E 11 21.33 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS OPERATOR FAILS TO ACTUATF. A SYSTEM U$!NG DAS ONLY 1.16E 02 REC-MANDAS 3

4.02E-11 18.40 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF PMS AMD FLS sVFTWARE 1.20C-06 CCX SFTW FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 4

1.17E-12

.54 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.7BE 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 5

1.03E-12

.47 IkIATING EVENT

LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW C04 hen CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX-TRNSM FA! LURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS COND, PR06. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC C0AMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX-CB-GO 1

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 6

1.03E 12

.47 INITIAT!bG EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 7

5.46E 13

.25 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCX TT-UF OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS 8

5.37E-13

.25 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT DCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78EiD4 CCX-TRNSM EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXMOD1 SW 9

5.37E-13

.25 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3 MOD 07 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001 S 10 4.70E 13

.22 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW COMMON CAUSE FAILURE OF TEMP SENSORS 1.1TE 04 CCX TT-UF FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 11 4.48E 13

.21 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA OPERATOR FAILS TO ACTUATE A STSTEM USING DAS ONLY 1.16E-02 REC MANDAS 12 4.21E-13

.19 INITI ATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.7BE 04 CCX-TRNSM EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3 MOD 07 COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX-EP-SAM 13 4.21E 13

.19 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW

^

COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT

4. 7BE- 04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CACINET SUPPLY) 3.05E 04 ED3 MOD 07 COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX EP SAM

File: 1ALMF 18. DES Cre:ted: Fri May 24 16:20:34 1996 Page 2 of 3 Length: 23214 bytes Queued: Fri May 24 17:23:02 1996 14 3.86E 13

.18 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILUR2 0F PMS AND PLS SOFTWARE 1.20E-06 CCX-SFTW COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 15 2.04E 13

.09 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW l

COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXMOO1-SV 16 2.04E-13

.09 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRES $URE ENVIRONMENT 4.78E 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001-SW 17 1.76C-13

.08 INITIATING EYCNT LOS3 0F MA!N FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.7BE-04 CCX TRNSM FAILURE OF AUTOMATIC DAS FUNCT!DN 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAs COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX-PMXM001-SW 18

'1.76E 13

.08 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HlGH PRESSURE ENVIRONMENT

4. 7BE- 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001-SW 19 1.60E 13

.07 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX-TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP-SAM 20 1.60E-13

.07 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX-EP SAM 21 1.38E-13

.06 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSOR $ IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX-EP-SAM 22 1.38E 13

.06 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX-EP-SAM 23 7.05E-14

.03 INITI ATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX-XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX XMTR195 OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 24 6.19E 14

.03 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX TRNSM EDS3 EA 1 DISTR. ' PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E-04 RPX CS-GO OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 25 6.19E 14

.03 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CASINET SUPPLY) 3.05E 04 ED3M0007 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX-C8 GO DPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 26 3.13E 14

.01 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT

4. 78E-04 CCX XMTR FDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3M0007 COMMON CAUSE FAILURE OF PZR LEVEL SENSORS

4. 78E- 04 CCX XMTR195 OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM MAN 01

Fils: 1ALMF 18. DES Crocted: Fri M:y 21 16:20:34 1996 Fage 3 of 3 Length: 23214 bytas Queued: Fri M;y 2417:25:021996 27 2.75E 14

.01 INITIATING EVENT Loss OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX-TRNSM EDS3 EA 1 DISTR. PANEL FAl:URE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3M0007 COMMON CAUSE FAILURE OF RCP MEAKERS FAIL TO OPEN 4.20E 04 RPX-CB-GO OPERATOR FAILS TO RECOGNIZE NiED Fo RCS DEPR. (SLOCA/TRANS!ENT) 1.34E 03 LPM MAN 01 g

28 2.75E 14

.01 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 E03M0007 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO OPERA 10R FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM-MAN 01 29 2.31E 14

.01 INITIATING EVENT - LOSS OF MA!N FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE of SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E*03 ADN MAN 01 30 2.03E-14

.01 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV-LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX-TRNSM FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 31 2.03E-14

.01 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW COMMON CAUSE FAILURE OF SENSOR $ IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX-CB GO OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 32 1.94E-14

.01 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX-TRNSM FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001

{

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E-02 ED3M0004 i

COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001-St !

33 1.94E-14

.01 INITIATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW COMMON CAUSE FAILURE OF SENSOR $ IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E 04 ED3M0001 STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E-02 ED3M0004 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001-St 34 1.62E-14

.01 INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E 03 ECOM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCIL 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN STANDBT DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO1DG001TM

File: 1ALOS 10. DES Crocted: Fri May 24 16:20:(4 1996 Page 1 ef 3 Length: 20182 bytes Queued: Fri May 25 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1

Title:

AP600-7 File: 1ALOS 10.WLK ( WLINK2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PR08A81LITY INCREASED)

Reduced Sun of Cutsets: 2.2620E 12 NUMSER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

4.70E 13 20.78 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.0$E 04 ED3M0007 COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3.84E-05 CMX VS FA 2

1.80E-13 7.96 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01

!EV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR I

COMMON CAUSE FAILURE OF TEMP SENSOR $

1.17E 04 CCX-TT UF COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.B4E 05 CMX vs FA 3

1.79E 13 7.91 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX-XMTR FAILURE OF AUTOMATIC DAS FUNCT!DN 1.00E-02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E-05 CMX VS-FA 4

1.54E 13 6.81 INITI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01

!EV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.B4E-05 CMX VS FA 5

1.48E-13 6.54 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMTR 4

COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX-AV-LA COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSOR $

3.84E-05 CMX-VS-FA 6

1.37E 13 6.06 INITI ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCX-TT-UF OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS DNLY 1.16E-02 REC-MANDAS 7

1.18E 13 5.22 INITIAT'ING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 '

CCX-TT-UF FAILURE OF MANUAL DAS HARDWARE 1.00E-02 HDAS 8

1.12E 13 4.95 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANDAS 9

9.68E 14 4.28 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX-AV LA FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 10 5.77E 14 2.55 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS STAND 8Y DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX-PMXMOO1-St COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCX-TT-UF OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANDAS 11 4.97E-14 2.20 INITI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTM ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001-St COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCX TT-UF FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS

Flies 1ALOS 10. DES Craited: Fri May 25 16:20:45 1996 Pa9e 2 of 3 Length: 20182 bytes Queued: Fri M:y 24 17:25:02 1996 12 4.73E 14 2.09 INITIATING EVENT LOSS OF OFFSITE POWER EVENT DCCURS 1.20E-01 LEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 Zo20G002TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV-LA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS l

COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001-Si i

i 13 4.71E 14 2.08 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE To TEST AND MAINTENANCE 4.60E-02 202DG002TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV-LA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 14 4.71E 14 2.08 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo20G002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 15

.',.71E 14 2.08 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE.

4.60E 02 201DG001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285022TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN 16 4.71E-14 2.08 INITIATING EVENT LOSS OF CFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO1DG001TM 17 4.52E-14 2.00 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBT DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo2DG002TM COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX-EP-SAM COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCX-TT-UF OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS 18 4.45E 14 1.97 INITIATING EVENT LOSS OF OFFS!TE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT

4. 78E - 04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED5 MOD 07 COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN' 1.10E-03 ADX-MV-GO OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 19 4.08E-14 1.80 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 S 20 4.0TE 14 1.80 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT

4. 78E-04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3M0007 COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE M3Vs TO OPEN 1.10E-03 AD X-MV-GO OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 21 3.90E 14 1.72 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO20G002TM COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX EP-SAM COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E 04 CCX TT-UF FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 4

22 3.71E 14 1.64 INITI ATING EVENT 10SS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE To RECCu R UFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG Uh* allABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DGCO2TM COMMON CAUSE PAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP SAM

Fils: 1ALos-10. DES Crected: Frf M;y 24 16:20: 4 1996 Page 3 of 3 Length: 20182 bytes Queued: Fri May 25 17:25:02 1996 23 3.20E*14 1.41 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV-LA FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX-EP-SAM 24 2.53E 14 1.12 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS DG FAILS TO STAR 1 & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2M0001 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX-PMXM001 SW COMMON CAUSE FAILURE OF TEMP SENSORS 1.1TE 04 CCX TT-UF OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANCAS 25 2.18E 14

.96 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 202M0001 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX-PMXM001-Sb COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCX 1T UF FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 1

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d File: 1PNLO 16. DES Cr sted: Fri May 24 16:17:06 1996 Page 1 of 8 Length: 66902 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMlWANT CUTSETS *****

Page:

1 1

Title:

AP600 7 File: 1PNLO 16 WLK ( File created by linking ntoca.in WLINK2 ** Ver. 4.02 **)

Reduced Sun of Cutsets: 1.6710E 09 i

WUMBER.CUTSET PROB PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER ii 1-5.41E 10 32.38 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX-CB GO i'

COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC M NDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 2

4.93E 10 29.50 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMM0lf CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS AC(.)

5.06E 01

' REC-MANDASC i

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 3

7.85E 11 4.70 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF 4 A0VS TO OPEN 6.10E 05 CCX AV-LA COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 4 ' 7.20E 11 4.31 1%IT!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04

[EV NLOCA 00pBION CAUSE FAILURE OF 4 A0VS TO OPEN 6.10E 05 CCX AV-LA L1ND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 J

5 6.54E 11 3.91 IN!TIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF 4 CMT CHECK VALVES TO OPEN 5.10E 05 CMX CV GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC l

OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 L

6 6.02E 11 3.60 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF 4 CMT CHECK VALVES TO OPEN 5.10E 05 CMM CV-Go COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC l

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 7

2.27E 11 1.36 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB063GO PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB064GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACY.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 8

2.27E-11 1.36 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1CB061GO PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1CB062GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 l

9 2.27E 11 1.36 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB053G0 PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1CB054GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 10 2.27E 11 1.36 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB051Go PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB052G0 kT kl t

Z OR R PR M d 30E-N 11 2.08E 11 1.24 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILE TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CS063GO PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1CB064G0 COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06C 01 REC MANDASC OPERA 10R FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 12 2.08E 11 1.24 IN!T!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB061GO

. PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN

'.20E-03 RC1CB062GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 l

13 2.08E 11 1.24 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP A FAILS TO 1 RIP BREAKER FAILS TO OPEN 4.20E 03 RC1CB053GO PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB054G0 j

File: 1 POLO 16. DES Cracted: Fri M;y 24 16:17:06 1996 Pr8e 2 of 8 Length: 66902 bytes Queued: Fri May 24 17:25:02 1996 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 14 2.08E-11 1.24 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RCIC8051GO i

PUMP A FAILS TO TPIP - BREAKER FAILS TO OPEN 4.20E 03 RC1CB052Go l

COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 15 1.07E-11

.64 INITI ATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF RCP SREAKERS Fall TO OPEN 4.20E 04 RPX CB-GO FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 16 9.77E 12

.58 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX-CB-GO FA! LURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 17 4.71E 12

.28 INITI ATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS 70 DPEN 4.20E 03 RC1C8063GO COMPONENTS FAILURE 8.76E 04 RPTMOD08 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 18 4.71E-12

.28 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMPONENTS FAILURE 8.76E-04 RPTMOD07 PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8064GO COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 19 4.71E-12

.28 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1Cs061GO COMPONENTS FAILURE 8.76E-04 RPTM0006 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC DPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 20 4.71E 12

.28 INITI ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E-04 RPTM0005 PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1C8062GO COND PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 21 4.71E 12

.28 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1Cs053GO COMPONENTS FAILURE 8.76E-04 RPTM0004 i

COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 22 4.71E 12

.28 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0003 PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RCICB054G0 COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 23 4.71E-12

.28 !NITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1C8051GO COMPONENTS FAILURE 8.76E 04 RPTM0002 COND. PROS. OF REC MANDAS (F AILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 24 4.71E-12

.28 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMPONENTS FAILURE 8.76E-04 RPTM0001 PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1C8052GO COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 25 4.33E-12

.26 INITIATING EVENT INTERMEDIATE LOCA EVENT DCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RCIC8063GO COMPONENTS FAILURE 8.76E-04 RPTMOD08 COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 26 4.33E 12

.26 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E-04 RPTM0007 PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1C8064GO COND PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01

f Files 1PNLO-16. DES Crx teds Fri May 24 16:17:06 1996 Fase 3 of 8 Length: 66902 bytes Queued: Fri M:y 24 17:25:02 1996

)

i 27 4.33E-12

.26 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB061GO COMPONENTS FAILURE 8.76E-04 RPTM0006 COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 28 4.33E 12

.26 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV*NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0005 PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB062GO COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 29 4.33E 12

.26 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB053GO COMPONENTS FAILURE 8.76E-04 RPTM0004 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 30 4.33E 12

.26 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E-04 RPTM0003 PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8054GO COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 31 4.33E 12

.26 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8051GO COMPONENTS FAILURE 8.76E-04 RPTM0002 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAl;S TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 32 4.33E 12

.26 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0001 PUMP A FAIL 3 TO TRIP BREAKER FAILS TO OPEN

'. 20E-03 RC1CC052GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 33 2.58E 12

.15 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 Sb EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 34 2.02E-12

.12 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP SAM EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3M0007 35 1.62E-12

.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B. FAILS TO TRIP - BREAKER FAILS To OPEN 4.20E 03 RC1CB063GO BUS IDSB DS 1 UNAVAILABLE DUE TO TCST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 36 1.62E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP

BREAKER FAILS TO OFEN 4.20E-03 RC1CB063GO BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04

!DBBSDDITM CONO. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06C-01 REC-MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 37 1.62E 12

.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 LEV *NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB064GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 38 1.62E 12

.10 INITIATING EVE'NT

INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1C8064GO BUS UNAVAILABLE DUE To TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDDITM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 39 1.62E 12

.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB061GO BUS IDSB-DS-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDSITM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 40

' 62E-12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB061GO BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDDITM

Fits: 1PNLO 16. DES Crected: Fri M y 24 16:17:06 1996 f

Page 4 of 8 Length: 66902 bytes Queued: Fri M;y 24 17:25:02 1996 COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS To RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 41 1.62E-12

.10 INITI ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS To TRIP - BREAKER FAILS To OPEN 4.20E-03 RCICB062GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDS1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 42 1.62E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RCIC8062Go BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDD1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 43 1.62E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8053Go BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM l

CONO. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 44 1.62E 12

.10 INITIATING EVENT INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RCICB053GO BUS 1058 00-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDDITM COND. PROB. OF REC MANDAS (FA! LURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 45 1'62E 12

.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB054GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDS1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 46 1.62E 12

.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1C8054GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDD1TM COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 47 1.62E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RCICB051Go BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM COND. PROB 0F REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR ' RAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 48 1.62E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA i

PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8051GO

)

BUS 1058 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDDITM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 49 1.62E 12

.10 INITIATING EVENT - INTERMEDI ATE LOCA EVENT 0 CURS 7.70E-04 IEV-NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1C8052GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAthiENANCE 3.00E-04 IDCBSDS1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 50 1.62E 12

.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1C8052Go BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDD1TM COND. PROB. OF RCC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 51 1.55E 12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF 4 ADVS TO OPEN 6.10E-05 CCX AV-LA FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 52 1.48E-12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1CB063Go BUS 1D58-03 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC j

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 53 1.48E-12

.09 INITIATING EVENT - INTERMFDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RCICB063GO BUS IDSB DD-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC

Fils: 1PNLO 16. DES Crssted: Fri May 24 16:17:06 1996 Page 5 of 8 Length: 66502 bytes Queued: Fri M:y 2417:25:021996 OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 54 1.48E-12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP 8 FAILS TO TRIP BREAKER FAILS TO DPEN 4.20E-03 RCICB06400 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC DPERATOR FA!LS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 55 1.48E-12

.09 INITIATING EVENT INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB064G0 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDD1TM COND. PROS. OF REC-MANDAE (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUAL'.Y ACTUATE ADS 3.02E 03 ADN-MAN 01 56 1.48E-12

.09 IN!TI ATING EVENT - INTERFEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA PUMP 8 Fi!LS TO TRIP - BLEAKER FAILS TO OPEN 4.20E 03 RC1CB06100 BUS IDSB L31 UNAVAILABL'i DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM COND. PROS. OF REC MANSAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS iu MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 57 1.48E 12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB061Go BUS IDSB-DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 58 1.48E 12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1CB062Go BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 59 1.48E 12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8062Go BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDD1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 60 1.48E-12

.09 INITI ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO DPEN 4.20E-03 RC1CB053Go BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM COND PROS OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC DPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 61 1.48E 12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RCICB053Go BUS IDSB DD-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDD1TM COND PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 62 1.48E-12

.09 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RCICB054GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 63 1.48E 12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB054GO BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDDITM COND. PRO 8. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 64 1.48E 12

.09 INITI ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO DPEN 4.20E-03 RC1CB051GO BUS 10S8-05-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 65 1.48E 12

.09 INITI ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E*03 RCIC8051Go BUS IDS 8 DD-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 66 1.48E-12

.09 INITI ATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1C8052GO SUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM COND. PROB. OF 9EC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC

File: 1PNLO 16. DES Cre:ted: Fri May 24 16:17:06 1996 Page 6 of 8 Length: 66902 bytes Queued: Fri May 25 17:25:02.96 OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 67 1.48E 12

.09 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO 00EN 4.20E-03 RC1CB052GO B07. UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04

!DCBSDDITM COND. PROS. OF REC MANDAS (FAILURE OF MAdUAL DAS ACT.)

5.06E-01 REC-MANDASC i

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 1

68 1.42E 12

.08 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF 4 A0VS TO OPEN 6.10E-05 CCX AV-LA FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 69 1.30E-12

.08 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF 4 CMT CHECK VALVES TO OPEN 5.10E 05 CMX CV GO l

FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 70 1.19E 12

.07 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04

!EV NLOCA COMMON CAUSE FAILURE OF 4 CMT CHECK VALVES TO OPEN 5.10E 05 CMX-CV GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 71

,9.86E-13

.06 INITIATING EVENT - INTERMEDIATE LOCA EVDIT OCCURS 7.70E-04 IEV-NLOCA COMPONENTS FAILURE 6.76E 04 RPTM0007 COMPONENTS FAILURE 8.76E 04 RPTMOD08 COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 72 9.86E 13

.06 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMPONENTS FAILURE 9.76E-04 RPTMODOS 8.76E 04 RPTM0006 COMPONENTS FAILURE 5.06E 01 REC-MANDASC COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

OPERATOR FA!LS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 73 9.86E 13

.06 1NITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA I

COMPONENTS FAILURE 8.76E 04 RPTMOD03 COMPONENTS FAILURE 8.76E 04 RPTM0004 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 i

l 74 9.86E 13

.06 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA

)

COMPONENTS FAILURE 8.76E*04 RPTM0001 COMPONENTS FAILURE

.8.76E-04 RPTMOD02 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02

'75 9.03E-13

.05 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMPONENTS FAILURE 8.76E-04 RPTMOD07 COMPONENTS FAILURE 8.76E-04 RPTM0008 COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATGR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 76 9.03E 13

.05 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA 1

COMPONENTS FAILURE 8.76E 04 RPTM0005 8.76E 04 RPTM0006 1

^

COMPONENTS FAILURE COND. PROS. OF REC-MANDAS (F AILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC l

OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 77 9.03E 13

.05 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0003 COMPONENTS FAILURE 8.76E-04 RPTM0004 COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 78 9.03E 13

.05 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E-04 RPTMOD01 COMPONENTS FAILURE 8.76E 04 RPTM0002 COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 79 6.80E 13

.04 INIT!ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA CMT FLOW TUNING ORIFICE PLUCS 7.27E-04 CMA PLUG CMi FLOW TUNING ORIFICE PLUGS 7.27E 04 CM8 PLUG COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 80 6.24E 13

.04 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA

i File: IfMLO-16. DES Cre:ted: Fri May 25 16:17:06 1996 fage 7 of 8 Length: 66902 bytes Queued: Fri May 24 17:25:02 1996 CMT FLOW TUNING ORIFICE PLUGS 7.2TE 04 CMA PLUG CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMB-PLUG f

COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 81 4.4BE 13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB063GO PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB064GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 82 4.48E-13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP

BREAKER FAILS TO OPEN 4.20E-03 RC1CB061GO PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1CB062G0 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 83 4.48E-13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB053GO i

PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1C8054GO 1

FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 84 4.48E 13

.03 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB051GO PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E-03 RC1CB052GO FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 85 4,10E 13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1CB063Go PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1CB064GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 86 4.10E 13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA PUMP B FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1C8061GO PUMP B FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E-03 RC1C8062GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 G7 4.10E 13

.02 INITIATING EVENT

INTERMEDIATE LOCA EVENT' OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RCICB053GO PUMP A FAILS TO TRIP

BP.EAKER FAILS TO OPEN 4.20E-03 RC1CB054G0 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 88 4.10E 13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA PUMP A FAILS TO TRIP - BREAKER FAILS TO OPEN 4.20E 03 RC1CB051GO PUMP A FAILS TO TRIP BREAKER FAILS TO OPEN 4.20E 03 RC1CB052GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 89 3.89E 13

.02 INITIATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO1DG001TM MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E-03 ECOM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM 90 3.68E 13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN COMMON CAUSE FAILURE TO START OF ENGINE DRIVEN FUEL PUMPS 2.00E-03 ZOX-PD ES MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12]

5.08E-03 ECOM0001 91 3.38E 13

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E-04 RPTM0007 BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 92 3.38E-13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV MLOCA COMPONENTS FAILURE 8.76E-04 RPTM0007 BUS 1058 D01 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 93 3.3SE-13

.02 INITI ATING EVENT INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTMOD08

l File: 1PNLO 16. DES Crsated Fri May 24 11:17:06 1996 Page 8 of 8 Length: 66902 bytes oueued: Fri M:y 2617:25:021996 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 94 3.38E*13

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 LEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0008 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBS001TM CONO. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 95 3.38E 13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVEN' OCCURS 7.70E 04 IEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0005 BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDSBSDS1TM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS 70 RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 96 3.38E 13

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMPONENTS FAILUPE 8.76E 04 RPTM0005 BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSD01TM COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 97 3.3BE 13

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0006 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDSITM COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 98 3.38E 13

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E - 04 RPTM0006 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBS001TM COND. PROS. OF REC MANDAS (F AILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02

' 99 3.38E-13

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMPONENTS FAILURE 8.76E 04 RPTM0003 BUS IDSB-DS-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDSITM COND. PROS. OF REC MAADAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO RfCOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 100 3.38E-13

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMPONENTS FAILURE 8.76E-04 RPTMOD03 1

BUS IDSB DD-1 ULAVa!LABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBS001TM COND. PROS. OF RfC F4MDAS (F AILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS 'io RECC'4t!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM MAN 02 l

File: 2ELLO 03. DES-Crs ted: Fri May 2i 16:17:16 1996 Page 1 of 8 Length: 64573 bytes Gueued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Title AP600 7 Fits: 2ELLO 03.WLK ( File created by linking tloca.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 1.9210E-08 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

5.41E 09 28.16 INITI ATING EVENT

LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC GROUPS (HARDWARE) 1.03E-04 CCX INPUT LOGI 2

3.20E 09 16.66 INITIATING EVENT

LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF 4 A0VS TO OPEN 6.10E-05 CCX-AV-LA 3-2.68E 09 13.95 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK $1ZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF 4 CMT CHECK VALVES TO OPEN 5.10E 05 CMX-CV Go 4

2.02E 09 10.52 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3,.84E 05 CMX VS-FA

.5-1.5SE-09' 8.22 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05C 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF 4 IRWST INJECT!DN CHECK VALVES 3.00E-Li IWX CV-A0 6

1.37E 09 7.13 INITI ATING EVENT - LARGC LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF 4 IRWST INJECTION S0U18 VALVES 2.60E-05 IWX EV SA 7

6.30E-10 3.28 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZF UPPER END OF BREAK'81ZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX-FL GP 8

5.77E-10 3.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001 Sb 9

5.77E 10 3.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.U5E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BS!ZE LARGE COMMON CAUSE FAILURE OF PMG ESF ArTUATION LOGIC SOFTWARE 1.10E-05 CCX-PMXM002 Sk i

10 5.77E 10 3.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BS!ZE LARGE COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC SOFTWARE 1.10E-05 CCX !N LOGIC SW 11 4.53E 10 2.36 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK.S!ZE 5.00E 01 BS!ZE-LARGE COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX EP SAM 12 6.30E 11

.33 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSf2E LARGE COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW 13 2.77E 11

.14 INITIAT!NG EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E 01 BS!ZE-LARGE CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMA PLUG CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMB-PLUG 14 6.64E 12

.03 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END or BREAK SIZE 5.00E 01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 j

FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 15 6.64E 12

.03 INITIATING EVENT

LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF IPC CABINET 5.02E-03 PMBM0032 FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 16 6.64E-12

.03 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF IPC CABINET 5.02E-03 PMBM0032

Fils: 2ELLO 03. DES Cr::ted: Fri May 24 11:17:16 1996 Page 2 of 8 Length: 64573 bytes Queued: Fri May 26 17:25:02 1996 FAILURE OF INPUT GROUP 3 5.02E 03 PMCM0033 17 6.64E-12

.03 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02Z 03 PMBM0032 FAILURE OF INPUT GROUP 3 5.02E 03 PMcM0033 FA! LURE OF INPUT GROUP 4 5.02E-03 PMOM0034 18 6.30E 12

.03 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CMT TANKS 1.20E 07 CMX-TK-AF 19 3.02E 12

.02 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE IWRST Di$ CHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA PLUG IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E 04 IWB PLUG 20 4.19E-13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E-04 IDBM0024 21

~4.19E 13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 FAILURE OF INPUT GROUP 4 5.02E-03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E 04 IDCM0028 22 4.19E 13

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E 01 BS12E LARGE FAILURE OF IPC CABINET 5.02E-03 PMSM0032 FAILURE OF INPUT GROUP 3 5.02E-03 PMcM0033 LOSS OF DIST. PANEL DR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 IDDM0032 23 4.19E 13

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE FAILURE OF INPUT GROUP 3 5.02E 03 PMCM0033 FAILURE OF INPUT GROUP 4 5.02E 03 PMDMOD34 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3;17E-04 IDAM0004 24 4.19E 13

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK $1ZE 5.00E-01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02E-03 PMAMOD31 FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCM0028 25 4.19E 13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 IDDM0032 26 4.19E 13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 FAILURE OF INPUT GROUP 4 5.02E 03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A07 SPUR 10USLY OPENS 3.1TE 04 IDAM0004 27 4.19E 13

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF INPUT GROUP 4 5.02E 03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.1TE-04 IDBM0024 28 4.19E-13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02E-03 PMAM0031 FAILURE OF IPC CABINET 5.02E 03 PMBM0032 LOSS OF DIST. PANEL 04 BREAKER A28 SPUR 10USLY DPENS 3.17E 04 IDDM0032 29 4.19E-13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SI7E - UPPER END OF BREAK SIZE 5.00E-01 CSIZE-LARGE FAILURE OF IPC CABINET 5.02E-03 PMSM0032 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.1TE-04 IDAM0004 30 4.19E 13

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA j

1

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FAILURE OF INPUT GROUP 3 5.02E 03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E 04 IDBM0024 31 4.19E-13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF IPC CABINET 5.02E 03 PMBM0032 LOSS OF DIST. PANEL DR BREAKER A21 SPURIOUSLY OPENS 3.17E 04 IDCMOD28 32 9.65E*14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E 01 BSIZE LARGE CMT FLOW TUNING ORIFICE PLUGS 7.2TE-04 CMA PLUG HARDWARE FAILURE OF CMT ADV 0148 1.59E 03 CMBAv014LA HARDWARE FAILURE OF CMT A0V 015B 1.59E-03 CMBAv015LA 1

33 9.65E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF CMT ADV 014A f.59E-03 CMAAV014LA HARDWARE FAILURE OF CMT A0V 015A 1.59E-03 CMAAV015LA CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMS PLUG 4

34 9.16E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E*04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE CMT TANK 7002A RUPTURES 2.40E 06 CMATK002AF CMT FLOW TUNING ORIFICE PLUGS 7.2TE 04 CMB PLUG 35 9.16E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMA PLUG CMT TANK T0028 RUPTURES 2.40E 64 CMBTK002AF 36 7.63E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA J

LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE CMT CHECK VALVES V016A OR 017A Fall TO CPEN 2.00E-06 CMA CV CMT FLOW TUNING CRIFICE PLUGS 7.27E 04 CMB PLUG 37 7.63E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMA PLUG CMT CHECK VALVES V0168 OR 0178 FAIL TO OPEN 2.00E-06 CMB CV 38 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA 4

LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX IV xR UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM STATIC TRANSFER SWITCH OR BREAKER A05 FAILURE 2.19E-02 IDAM0007

.39 7.45E 14

.00 INITIATING EVfNT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV xR UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM STATIC TRANSFER SWITCH OR BREAKER A19 FAILURE 2.19E 02 IDCM0031 40 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV AR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM STATIC TRANSFER SWITCH OR BREAKER A05 FAILURE 2.19E 02 IDAM0007 41 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04

!EV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX IV xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.705 03 EC2BS022TM STATIC TRANSFER SWITCH OR BREAKER A19 FAILURE 2.19E 02 IDCM0031 42 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV-xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM STATIC TRANSFER SWITCH OR BREAKER A05 FAILURE 2.19E-02 IDAM0007 43 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM STATIC TRANSFER SWITCH OR BREAKER A19 FAILURE 2.19E-02 IDCM0031

Files 2ELLO 03. DES Crscted: Fri ray 24 16:17:16 1996 Page 4 cf 8 Length: 64573 bytes oueued: Fri M:y 26 17:25:02 1996 44 7.45E-14

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STATIC TRANSFER SWITCH OR BREAKER A12 FAILURE 2.19E-02 IDSM0027 45 7.45E*14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV XR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM STATIC TRANSFER SWITCH OR BREAKER A12 FAILURE 2.19E 02 ICBMOD27 46 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX-IV XR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM STATIC TRANSFER SWITCH OR BREAKER A12 FAILURE 2.19E 02 IDBM0027 47 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX-IV xR UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC185001TM i

STATIC TRANSFER SWITCH DR BREAKER A26 FAILURE 2.19E-02 IDDM0035 48 7.45E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX-IV XR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC18$012TM STATIC TRANSFER SWITCH OR BREAKER A26 FAILURE 2.19E-02 IDDM0035 49 7.45E-14

.00 -INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA I

LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV-XR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM STATIC TRANSFER SWITCH OR BREAKER A26 FAILURE 2.19E 02 IDDM0035 i

50 3.86E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E-01 BS!ZE LARGE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E-04 IWA PLUG IRWOT CHECK VALVE 122B FAILS TO OPEN 1.75E 03 IWBCV122A0 IRWST CHECK VALVE 1248 FAILS To OPEN 1.75E-03 IWBCV124A0 51 3.86E-14

.09 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E-01 BSIZE-LARGE IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACv122A0 i

IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E-03 IwACV124A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB-PLUG

$2 3.34E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN UNAVAILABIL!iY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM FAILURE OF IPC CABINET 5.02E 03 PMAM0031 53 3.34E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC285002TM j

FAILURE OF INPUT GROUP 3 5.02E 03 PMCMOD33 54 3.34E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E 01 BS!ZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM FAILURE OF IPC CABINET 5.02E-03 PMAM0031 55 3.34E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM FAILURE OF INPUT CROUP 3 5.02E 03 PMCM0033 56 3.34E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM FAILURE OF IPC CABINET 5.02E-03 PMAM0031

File: 2ELLO-03. DES Cre:ted: Fri May 24 16:17:16 1996 Page 5 of 8 Length: 64573 bVtes Queued: Fri M:y 24 17:25:02 1996 57 3.34E 14

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.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 59 3.34E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 60 3.34E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.7DE 05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 61 3.34E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.0$E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM l

62 3.34E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV*LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PW BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 63 3.34E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA j

LLOCA BREAK $12E - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UN$CHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 64 3.22E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E-04 IWA PLUG IRWST CHECK VALVE 1228 FAILS TO OPEN 1.75C-03 IWBCV122A0 HARDWARE FAILURE OF IRWST VALVE 125B 1.46E-03 IRWM0008 65 3.22E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK S!ZE 5.00E 01-BSIZE LARGE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA PLUG HARDWARE FAILURE OF IRWST VALVE 123B 1.46E-03 IRWM0007 IRWST CHECK VALVE 1248 FAILS TO OPEN 1.75E 03 IWBCV124A0 66 3.22E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE i

IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E-03 IWACV122A0 HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E 04 IWB PLUG 67 3.22E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST VALVE 123A 1.46E-03 1RWM0005 1RWST CHECK VALVE 124A FAILS TO OPEN 1.75E-03 IWACV124A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB PLUG i

68 2.75E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE CMT FLOW TUNING ORIFICE RUPTURES 7.20E 07 CMADR001EB CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMB PLUG (9 ' 2.75E-14

.00 !NITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER ENO 0F BREAK SIZE 5.00E-01 BSIZE-LARGE CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMA-PLUG CMT FLOW TUNING ORIFICE RUPTURES 7.20E-07 CMBOR001EB l

70 2.69E-14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA

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HARDWARE FAILURE OF IRWST VALVE 125B 1.46E-03 IRWM0006 71 2.69E 14 00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $!ZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE 4

HARDWARE FAILURE OF 1RWST VALVE 123A 1.46E 03 IRWM0005 l

MARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 i

IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB-PLUG j

72 2.65E 14

.00 INITI ATING EVENT LARGE LOCA CVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $12E 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM i

MAIN GEN. BKR ES 01 FAILS TO OPEN l# 12]

5.0BE-03 ECOMOD01 i

STANDBY DG UNAVAILABLE DUE To TEST AND MAINTENANCE 4.60E-02 201DG001TM a

73 2.65E 14

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LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E 01 BS!ZE-LARGE FAILURE Or INPUT GROUP 4 5.02E-03 PMDM0034 LOSS CF DIST. PANEL OR BREAKER A07 SPUR 10USLY OPENS 3.17E 04 IDAMOD04 LOS$ OF DIST. PANEL OR BREAKER A21 SPUR 10USLY OPENS 3.17E-04 IDCMOD28 i

T5 2.65E 14

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LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 LOSS OF DIST. PANEL DR BREAKER A07 SPUR 10USLY OPENS 3.17E-04 IDAMOD04 LOSS OF DIST. PANEL OR BREAKER A28 SPUR 10USLY OPENS 3.17E-04 IDDMOD32 76 2.65E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E Of BSIZE LARGE FAILURE OF IPC CABINET 5.02E-01 PMAMOD31 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCMOD28 i

LOSS OF DIST. PANEL OR BREAKER A28 SPUR 10USLY OPENS 3.17E-04 IDDM0032 77 2.65E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE FAILURE OF INPUT GROUP 4 5.02E-03 PMDMOD34 LOSS OF DIST. PANEL DR BREAKER A07 SPURIOUSLY OPENS 3.17E 04 IDAM0004 LOSS OF DIST PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E-04 IDBM0024 78 2.65E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04

!EV LLOCA LLOCA BREAK $1ZE

UPPER END OF BREAK SIZE 5.00E-01 BS!ZE LARGE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 LOSS OF DIST. PANEL OR BREAKER A07 SPUR 10USLY OPENS 3.1 TE-04 IDAM0004 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 IDDM0032 4

79 2.65E-14

.00 INITI ATING EVENT LARGE LOCA FvENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E-01 BSIZE-LARGE I

FAILURE OF IPC CABINET 5.02E-03 PMAM0031 LOSS OF DIST. PANEL DR BREAKER A14 SPURIOUSLY OPENS 3.17E-04 IDBM0024 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 IDDMOD32 80 2.65E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.17E-04 IDAM0004 LOSS OF DIST. PANEL DR BREAKER A14 SPUR 10USLY OPENS 3.17E 04 IDBM0024 81 2.65E 14

.00 INIT!ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE FAILURE OF IPC CABINET 5.02E-03 PMBMOD32 LOSS OF DIST. PANEL OR BREAKER A07 SPUR 10USLY OPENS 3.17E-04 IDAM0004 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCMOD28 82 2.65E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE FAILURE OF IPC CABINET 5.02E-03 PMAMOD31 LDSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E-04 IDBM0024 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCM0028

Fils: 2ELLO 03. DES Crc:ted: Fri May 25 16:17:16 1996 Page 7 of 8 Length: 64573 bytes Queued: Fri May 24 17:25:02 1996 83 2.65E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 LEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE FAILURE OF INPUT GROUP 4 5.02E 03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E 04 IDBMOD24 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E 04 IDCM0028 84 2.65E 14

.00 INIT!AT!NG EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE FAILURE OF INPUT GROUP 3 5.02E 03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E-04 IDBM0024 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 IDDMUo32 85 2.51E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF WREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN COMMON CAUSE FAILURE TO START OF ENGINE DRIVEN FUEL PUMPS 2.00E-03 20X PD ES MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E 03 ECOM0001 86 2.07E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERY CHARGERS 8.40E 06 CCX BC-SA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN 87 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA PLUG IRWST CHECK VALVE 122B FAILS TO OPEN 1.75E 03 IWBCv122A0 RELAY FAILS TO OPERATE 8.76E 04 IWCR$125BFA 88 1.93E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E-04 IWA PLUG IRWST CHECK VALVE 124B FAILS TO OPEN 1.75E-03 IWBCV124A0 RELAY FAILS TO OPERATE 8.76E-04 IWAR$123BFA 89 1.93E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE IRWST CHECK VALVE 122A FAILS TO OPEN

1. 75E-03 IWACv122A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB-PLUG RELAY FAILS TO OPERATE 8.76E-04 IWDRS125AFA 90 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE IRWST CHECK VALVE 124A FAILS TO OPEN

1. 75E-03 IWACV124A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWBRS123AFA 91 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UkvER END OF BREAK SIZE 5.00E-01 BS!ZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 92 1.80E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 93 1.80E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $!ZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 94 1.80E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00F-01 BS!ZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDUL D MAINTENANCE 2.70E 03 EC2BS022TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC18$001TM 95 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 96 1.80E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCbRS 1.0$E-04 LEV-LLOCA

File: 2ELLO 03. DES Crs:tod: Fri May 24 16:17:16 1996 Page 8 ef 8 Length: 645T3 bytes Queued: Fri May 24 17:25:02 1996 LLOCA BREAK $1ZE UPPER END OF BREAK $1ZE 5.00E 01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285022TM l

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM 97 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BS!ZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM UNAVAILABILITY OF BUS ECS ES 1 DUE To UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 98 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK $!ZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE To UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 99 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EvFNT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN BUS UNAVAILABLE DOE TO UNSCHEDULED MAILTENANCE 2.70E-03 EC2BS221TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM 100 1.71E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV XR UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM FAILURE OF IPC CABINET 5.02E 03 PMAM0031

)

6 1

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I i

Fits: 2ELLO-06. DES s Created: Fri May 24 16:17:28 1996 Page 1 sf 8 LonBth:.64573 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 i-

Titles AP600-7 Files 2ELLO 06.WLK ( File created by linking ttoca.in WLINK2 ** Ver. 4.02 **)

Reduced Sun of Cutsets: 1.9210E 06

]

I NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1.05E 04 IEV LLOCA 1

5.41E 09 28.16 INITIATING EVENT LARGE LOCA EVENT OCCURS 5.00E-01 BSIZE LLOCA BREAK SIZE LOWER END OF BREAK $!ZE COMMON CAUSE FAILURE OF FMS ESF INPUT LOGIC GROUPS (HARDWARE) 1.03Et04 CCX INPUT-LOGi 1.05E 04 IEV LLOCA 2

3.20E 09 16.66 INITIATING EVENT - LARGE LOCA EVENT OCCURS j

LLOCA BREAK SIZE LOWER END OF BREAK $12E 5.00E-01 BS!ZE I

COMMON CAUSE FAILURE OF 4 A0VS TO OPEN 6.10E 05 CCX AV*LA 3

2.68E 09 13.95 INITIATING EVENT - LARGE LOCA EVENT OCCUPS 1.0$E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF 4 CMT CHECK VALVES TO OPEN 5.10E 05 CMX CV-GO 4; 2.02E 09 10.52 INITIATING EVENT

LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK 31ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3.84E 05 CMX VS-FA 5

1.58E 09 8.22 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $12E 5.00E-01 BSIZE COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV-A0 6

1.37E 09 7.13 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE

. COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 1

7 6.30E-10 3.28 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF STRAINCRS IN IRWST TANK 1.20E 05 IWX FL-GP 8

5.77E 10 3.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE f

COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX-PMXM001 st 9

5.77E 10 3.00 INIT!ATING EVENT LARGE LOCA EVENT OCCUR $'

1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF PMS ESF ACTUATION LOGIC SOFTWARE 1.10E-05 CCX PMXMOD2 Si 10 5.77E 10 3.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04

!EV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC SOFTWARE 1.10E 05 CCX*IN LOGIC-5.

11 4.53E 10 2.36 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF OUTPUT ORIVERS 8.62E 06 CCX EP SAM 12 6.30E 11

.33 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA i

LLOCA BREAK $12E LOWER END OF BREAK SIZE 5.00E 01 BS!ZE COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SF1W 13 2.77E 11

.14 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.0$E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMA PLUG J

CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMB PLUG 14 6.64E 12

.03 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE l

FAILURE OF IPC CABINET 5.02E 03 PMAMOD31 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 f

FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 i

15 6.64E 12

.03 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 LEV-LLOCA l

'LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 j

FAILURE OF IPC CABINET 5.02E 03 PMBM0032 FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 16 6.64E 12

.03 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $!ZE 5.00E 01 BSIZE FAILURE OF IPC CABikET 5.02E 03 PMAM0031 FAILURE OF IPC CABINET 5.02E 03 PMBM0032

Files 2ELLO 06. DES Crected: Fri M:y 24 16:17:28 1996 Page 2 of 8 Length: 64573 bytes oueued: Fri May 24 17:25:02 1996 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 17 6.64E 12

.03 !NITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PM8M0032 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 FAILURE OF INPUT GROUP 4 5.02E-03 PMOM0034 18 6.30E 12

.03 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CMT TANKS 1.20E 07 CMX TK-AF 19 3.02E 12

.02 INITIAflNG EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE IWRST O!SCHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA-PLUG IWRST DISCHARGE LIN" "B" STRAINER PLUGGED 2.40E 04 IWB-PLUG 20 4.19E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.0$E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF INPUT GROUP 3 5.02E 03 PMCM0033 FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 LOSS OF DIST. PANEL OR BREAKER A14 $PURIOUSLY OPENS 3.17E 04 IDBM0024 21 4.19E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E 04 IDCM0028 22 4.19E 13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 FAILURE OF INPUT GROUP 3 5.02E 03 PMcM0033 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.1TE-04 IDDM0032 23 4.19E-13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 FAILURE OF INPUT GROUP 4 5.02E-03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A07 $PURIOUSLY OPENS 3.1TE 04 ID AM0004 24 4.19E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCM0028 25 4.19E 13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMAM0031 FAILURE OF INPUT GROUP 3 5.02E PMCM0033 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.1TE-04 IDOM0032 26 4.19E-13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.0$E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BS!ZE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 FA! LURE OF INPUT GROUP 4 5.02E-03 PMDM0034 LOSS OF DIST. PANEL OR BREAKER A07 $PURIOUSLY OPENS 3.17E 04 IDAM0004 27 4.19E-13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABINET 5.02E-03 PMAM0031 FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 LOSS OF DIST.' PANEL OR BREAKER A14 SPUR 10USLY OPENS 3.1TE-04 IDBM0024 28 4.19E-13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $!ZE 5.00E-01 BSIZE FAILURE OF !PC CABINET 5.02E 03 PMAM0031 FAILURE OF IPC CABINET 5.02E-03 PMBM0032 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E-04 IDDM0032 29 4.19E 13

.00 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.1TE-04 IDAM0004 4

30 4.19E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA

Files 2ELLO 06. DES Cre:ted: Fri May 24 16:17:28 1996 Fri ' y 24 17:23:02 1996 Page 3 of 8 L ength: 45573 bytes cueued:

4 LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 BSIZE FAILURE OF IPC CABINET 5.02E-03 PMAM0031 FAILURE OF INPUT GROUP 3 5.02E-03 PMcM0033 LOSS OF DIST. PANEL OR BREAKER A14 SPUR 10USLY OPENS 3.17E-04 IDBM0024 31 4.19E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABINET 5.02E-03 PMAM0031 FAILURE OF IPC CABINET 5.02E-03 PMBM0032 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E 04 IDCM0028 32 9.65E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMA PLUG HARDWARE FAILURE OF CMT ADV 0148 1.59E-03 CMBAV014LA HARDWARE FAILURE OF CMT A0V 0158 1.59E-03 CMBAV015LA 33 9.65E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK $1ZE 5.00E-01 BSIZE HARDWARE FAILURE OF CMT ADV 014A 1.59E 03 CHAAV014LA l

HARDWARE FAILURE OF CMT A0V 015A 1.59E 03 CMAAV015LA CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMB PLUG 34 9.16E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE CMT iANK T002A RUPTURES 2.40E-06 CMATK002AF CMT FLOW TUh!NG ORIFICE PLUGS 7.27E-04 CMB PLUG 35 9.16E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 BSIZE CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMA-PLUG CMT TANK T002B RUPTURES 2.40E-06 CMBTK002AF 36 7.63E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 BSIZE CMT CHECK VALVES V016A OR 017A Fall TO OPEN 2.00E-06 CMA-CV CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMB PLUG 37 7.63E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE i

CMT FLOW TUNING ORIFICE PLUGS 7.27E-04 CMA-PLUG j

CMT CHECK VALVES V0168 OR 017B FAIL TO OPEN 2.00E-06 CMB-CV i

i 38 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX-IV xR UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM t

STATIC TRANSFER SWITCH OR BREAKER A05 FAILURE 2.19E-02 IDAM0007 39 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK $12E 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX IV xR UNAVAILABILITY OF BUS ECS E5 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM STATIC TRANSFER SWITCH OR BREAKER A19 FAILURE 2.19E 02 IDCM0031 40 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX IV-xR

{

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM J

STATIC TRANSFER SWITCH OR BREAKER A05 FAILURE 2.19E-02 IDAM0007

]

41 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX IV xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM STATIC TRANSFER SWITCH OR BREAKER A19 FAILURE 2.19E-02 IDCM0031 42 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCX IV XR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM STATIC TRANSFER SWITCH OR BREAKER A05 FAILURE 2.19E-02 IDAMoD07 43 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BRCAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX-IV xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM STAfic TRANSFER SWITCH OR BREAKER A19 FAILURE 2.19E-02 IDCM0031 J

File: 2ELLO 06. DES Crested: Fri May 25 16:17:28 1996 Page 4 of 8 L enSth: 64573 bytes Queued: Fri M:y 2617:25:021996 44 7.45E-14

.00 INITIATING EVENT LARGE LOCA EVEN'T OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK $12E 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCx IV xR UNAVAILABILITY OF BUS ELS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM STATIC TRANSFER SWITCH OR BREAKER A12 FAILURE 2.19E 02 IDBM0027 45 7.45E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E-05 CCx IV xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM STATIC TRANSFER SWITCH OR BREAKER A12 FAILURE 2.19E-02 IDBM0027 46 7.45E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BRF K SIZE 5.00E 01 BS!ZE COMMON CAUSE FAILURE OF CLASS 1E NVERTERS 2.40E-05 CCX IV XR BUS UNAVAILABLE DUE TO UNSCHEDULEL MAINTENANCE 2.70E-03 EC1BS121TM STATIC TRANSFER SWITCH OR BREAKER A 2 FAILURE 2.19E 02 IDBM0027 4

47 7.45E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OLO!*S 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 BS!ZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX-IV xR UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM STATIC TRANSFER SWITCH OR BREAKER A26 FAILURE 2.19E 02 IDDM0035 48 7.45E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV-xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC185012TM STATIC TRANSFER SWITCH OR BREAKER A26 FAILURE 2.19E-02 IDDM0035 49 7.45E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK S!ZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX IV xR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM STATIC TRANSFER SWITCH OR BREAKER A26 FAILURE 2.19E 02 IDDM0035 50 3.86E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE IWRST DISCHARGE LINE "A" SiRAINER PLUGGED 2.40E-04 IWA PLUG IRWST CHECK VALVE 122B FAILS TO OPEN

1. 75E 03 IWBCV122A0 IRWST CHECK VALVE 1248 FAILS TO DPEN

1. 75E-03 IWBCV124A0 51 3.86E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $12E LOWER END OF BREAK SIZE 5.00E-01 BS!ZE IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 1RWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E 04 IWB PLUG 52 3.34E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM l

FAILURE OF IPC CABINET 5.02E 03 PMAM0031 53 3.34E 14

.00 INITIATING EVZNT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 54 3.34E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04

[EV LLOCA f

LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BS!ZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCx BT PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM FAILURE OF IPC CABINET 5.02E 03 PMAM0031 55 3.34E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BS!ZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM FAILURE OF INPUT GROUP 3 5.02E 03 PMCM0033 56 3.34E 14

.00 INITI ATING EVENT LARGE-LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM FAILURE OF IPC CABINET 5.02E 03 PMAM0031

File: 2ELLO 06.0ES Crattec. Fri May 24 16:17:23 1996 PaBe 5 of 8 Length: 64573 bytes Queued: Fri Mry 24 17:25:02 1996 57 3.34E 14

.00 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK $1ZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM FAILURE OF INPUT GROUP 3 5.02E 03 PhCM0033 58 3.34E 14

.00 INIT! ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 BSIZE FAILURE OF INPUT GROUP 4 5.02E-03 PMDM0034 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM

$9 3.34E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 LEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 60 3.34E 14

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM 61 3.34E 14'

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMBM0032 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 62 3.34E*14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE l

FAILURE OF IPC CABINET 5.02E 03 PMBM0032 COMMON CAUSE FAILURE OF CLASS 1E BATTERIE; 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC18$012TM 63 3.34E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 -

BSIZE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM 64 3.22E-14

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E-04 IWA PLUG IRWST CHECK VALVE 1228 FAILS TO OPEN

1. 75E-03 IWBCV122A0 HARDWARE FAILURE OF 1RWST VALVE 125B 1.46E 03 IRWM0008 65 3.22E 14

.00 INITIATING EVEWf LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA-PLUG HARDWARE FAILURE OF 1RWST VALVE 123B 1.46E-03 1RWM0007 IRWST CHECK VALVE 124B FAILS TO OPEN 1.75E 03 IWBCv124A0 66 3.22E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 HARDWARE FAILURE OF IRWST VALVE 125A 1.46E-03 IRWM0006 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E 04 IWB PLUG d

67 3.22E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST VALVE 123A 1.46E-03 IRWM0005 IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E 04 IWB PLUG 68 2.75E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE CMT FLOW TUNING ORIFICE RUPTURES 7.20E 07 CMADR001EB CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMB PLUG 69 2.75E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.0$E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE CMT FLOW TUNING ORIFICE PLUGS 7.27E 04 CMA PLUG CMT FLOW TUNING ORIFICE RUPTURES 7.20E-07 CMBOR001EB 70 2.69E 14

.00 INifl ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA

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.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF 3REAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF 1RWST VALVE 123A 1.46E 03 IRWM0005 HARDWARE FAILURE OF 1RWST VALVE 125A 1.46E-03 IRWM0006 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E 04 IWB-PLUG 72 2.65E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04

'EV LLOCA LLOCA BREAK SIZE -LOW 2R END OF BREAK S!ZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DG002TM MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E-03 ECOM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO10G001TM 73 2.65E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 BS!ZE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCM0028 LOSS OF DIST. PANEL OR BREAKER A28 SPUR 10USLY OPENS 3.17E-04 100M0032 74 2.65E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF INPUT GROUP 4 3.02E 03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A07 SPUR 100 SLY OPENS 3.17E 04 IDAMOD04 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.1TE 04 IDCM0028 75 2.65E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 12V-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE FAILURE OF INPUT GROUP 3 5.02E-03 PMCM0033 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.17E-04 IDAM0004 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.1TE 04 100M0032 76 2.65E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE 5.02E-03 PMAM0031 FAILURE OF IPC CABINET LOSS OF DIST. PAhEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCM0028 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E-04 IDOM0032 77 2.65E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $!ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF INPUT GROUP 4 5.02E-03 PMOM0034 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.1TE-04 IDAMOD04 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.1TE 04 10BM0024 78 2.65E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE 5.02E-03 PMBM0032 FAILURE OF IPC CABINET LOSS OF DIST. PANEL OR BREAKER A07 $PURIOUSLY OPENS 3.17E-04 IDAM0004 LOSS OF DIST. PANEL OR BREAKER A28 SPUR 10USLY OPENS 3.17E 04 100M0032 79 2.65E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE FAILURE OF IPC CABINET 5.02E 03 PMAMOD31 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E-04

!DBM0024 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 100M0032 80 2.65E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 BSIZE FAILURE OF INPUT GROUP 3 5.02E 03 PMcM0033 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.17E 04 IDAM0004 LOSS OF DIST. PANEL OR BREAKER A14 SPUR 10USLY OPENS 3.1TE 04 10BM0024 4

81 2.65E 14

.00 INITI ATING EVENT LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIEE FAILURE OF IPC CABINET 5.02E-03 PMBM0032 LOSS OF DIST. PANEL OR BREAKER A07 SPURIOUSLY OPENS 3.1TE-04 IDAM0004 LOSS OF DIST. PANEL OR BREAKER A21 SPUR 10USLY OPENS 3.17E-04 10CM0028 82 2.65E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF IPC CABlWET 5.02E 03 PMAM0031 LOSS OF DIST. PANEL OR BREAKER A14 SPURIOUSLY OPENS 3.17E 04 IDBM0024 LOSS OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E-04 IDCM0028 s

~.

a File: 2ELLO 06. DES Crssted: Fri May 24 16:17:28 1996 Page 7 of 8 Length: 64573 bytes Queued: Fri May 24 17:25:02 1996 4

83 2.65E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE FAILURE OF INPUT GROUP 4 5.02E 03 PMDM0034 LOSS OF DIST. PANEL DR BREAKER A14 SPUR 10USLY OPENS 3.17E 04 IDBM0024 LOS$ OF DIST. PANEL OR BREAKER A21 SPURIOUSLY OPENS 3.17E 04 IDCM0028 l

84 2.65E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA l

LLOCA BREAK SIZE LOUER END OF BREAK SIZE 5.00E-01 BSIZE

)

FAILURE OF INPUT GROUP 3 5.02E 03 PMcM0033 LOSS OF DIST. PANEL OR BREAKER A14 SPUR 10USLY OPENS 3.17E 04 IDBM0024 LOSS OF DIST. PANEL OR BREAKER A28 SPURIOUSLY OPENS 3.17E 04 IDDM0032 85 2.51C 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE l

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN COMMON CAUSE FAILURE TO START OF ENGINE DRIVEN FUEL PUMPS 2.00E 03 ZOX-PD ES MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E 03 ECOM0001 86 2.07E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERY CHARGERS 8.40E 06 CCX BC SA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN 87

,1.93E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E 01 BSIZE IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA-PLUG 1RWST CHECK VALVE 1228 FAILS TO OPEN

1. 75E-03 IWBCV122A0 i

RELAY FAILS TO OPERATE 8.76E 04 IWCR$125BFA 88 1.93E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA i

LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE i

IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E-04 IWA PLUG 1RWST CHECK VALVE 1248 FAILS TO OPEN 1.75E 03 IWBCV124A0 RELAY FAILS TO OPERATE 8.76E 04 IWARS123BFA 4

89 1.93E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 34 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE 1

1RWST CHECK VALVE 122A FAILS TO OPEN 1.75E-03 IWACV122A0 I

IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWDR$125AFA 90 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA a

LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE i

IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 IWRST DISCHARGE LINE "B" STRAINER PLUGGED 2.40E-04 IWB-PLUG RELAY falls TO OPERATE 8.76E-04 IWBRS123AFA

'1 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA 9

LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN UNAVAILABillTY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 92 1.80E-14

.00 INITIATlWG EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 1.05E-04 IEV LLOCA 93 1.80E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATH RIES 4.70E-05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM i

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM 94

!.80E 14

.00 INITIATlWG EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $12E 5.00E-01 BS!ZE j

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 95 1.80E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM BUS UNAVAILABLE DOE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 96 1.80E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA

~

I

Files 2ELLo 06. DES Crocted: Fri May 24 16:17:28 1996 Page 8 of 8 Length: 64573 bytes Queued: Fri M:y 24 17:25:02 1996 LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHkDULED MAINTENANCE 2.70E 03 EC285022TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM 97 1.80E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1gS001TM 98 1.80E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 99 1.80E-14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE FOMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 100 1.71E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF CLASS 1E INVERTERS 2.40E 05 CCX-IV XR UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM FAILURE OF IPC CABINET 5.02E-03 PMAM0031

4 I

i Filc 2ELOS 07. DES Created: Fri May 25 16:20:54 1996

.Page 1 cf 7 Length: 54788 bytes

_ ueued: Fri May 24 17:25:02 1996 Q

- - - - DOMINANT CUTSETS *****

Page:

1

Title:

AP600 7 Files 2ELOS 07.WLK ( WLINK2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PROBABILITY INCREASED)

Reduced Sum of Cutsets: 4.5490E 12 WUMBER CUTSET PROB PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

3.78E-13' 8.31 INITIATING EVENT LOSS OF 0FFS:TE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STAN0BY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 2020G002TM COMMON CAUSE FAILURE OF PRHR AOVs 9.60E 05 PXX AV LA 4

N*RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 2

3.28E 13 7.21 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DC UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SP0 3.40E 02 RNAM0006 i

COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA 3

1.66E 13 3.65 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 LEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 CODBION CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV-A0 4

1.57E 13 3.45 INIT!ATI'NG EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01

!EV LOSP

)

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA HARDWARE FAILURE OF NORMAL RHR !$0LATION MOV 011 1.41E-02 RN11M003 i

COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 5

1.57E 13 3.45 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO20G002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 6

1.57E 13 3.45 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS STANDBY,DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX-CV A0 7

1.51E 13 3.32 INITIATING EVENT LOSS OF OFFS!TE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX-FL-GP 8

1.44E 13 3.17 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.0ZE 02 202 MOD 01 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 COMMON CAUS5 FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 9

1.36E 13 2.99 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM C00B40N CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E-02 RN11 MOD 3 COMMON CAUSE FAILURE OF 41RWST INJECTION UAllB VALVES 2.60E-05 IWX EV-SA 10 1.36E 13 2.99 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 Zo2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA

Files 2ELOS 07. DES Crected: Fri rey 24 16:20:54 1996 Fage 2 of 7 Length: 54788 bytes Queued: Fri May 24 17:25:02 1996 11 1.36E 13 2.99 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO20G002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA HARDWARE FAILURE 08 N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION $QU18 VALVES 2.60E-05 IWX EV-SA 12 1.33E-13 2.92 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00

)

BATTERY 081 UNAVAILABLE 2.70E 03 ED1M0003 j

COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA i

COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX-CV A0 13 1.15E-13 2.53 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO 80 aFTER L3 0F AIR 2.04E-01 REG MAN 00 BAti m 081 u ;."*ILABLE 2.70E-03 ED1M0003 COMMON CAUSE FAILURc N PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 IRW51 INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 14 7.26E-14 1.60 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS BUS IDSD-DS-1 UNAVAILABLE DUE To TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDSITM COMMON CAUSE FAILURE OF m R A0Vs 9.60E-05 PXX-AV LA COMMON CAUSE FAILURE JF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX-CV-A0 15 7.26E 14 1.60 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS i

BUS IDSD-DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDD1TM COMMON CAUSE FAILURE OF PRNR A0Vs 9.60E-05 PXX-AV-LA COMMON CAUSE FA! LURE OF 4 IRWST IMECTION CHECK VALVES 3.00E 05 IWX CV-A0 16 7.26E 14 1.60 INITIATING EVENT LOSS OF OFFSIfl POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS SUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 17 6.89E 14 1.51 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 LEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E-02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 10 6.89E-14 1.51 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2 MOD 01 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CD FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 19 6.89E-14 1.51 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 Zo2M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA i

HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSC FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 20 6.65E 14 1.46 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E 05 IWX FL-GP 21 6.29E 14 1.38 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP i

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 BUS !DSD-DS*1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA

)

22 6.29E 14 1.38 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LO$P FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS BUS ICSD-DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDOBSDDITM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA

File: 2ELOS 07. DES Cracted: Fri May 24 16:20:56 1996 Page 3 of 7 Length: 54788 bytes cueued: Fri M1y 26 17:25:02 1996 COMMON CAUSE FAILURE OF 4 !RWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 23 6.29E-14 1.38 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT DCCURS 1.20E-01 LEV LOSP FAILURE TO RECOVER OFFS!TE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDK1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 IRWST INJECTION SOU!B VALVES 2.60E 05 IWX-EV-SA 24 6.28E-14 1.38 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E-05 IWX FL GP 23 6.2BE 14 1.38 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL GP 26 6.28E-14 1.38 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FrC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL GP 27 5.97E-14 1.31 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 202M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05 IWX EV-SA 28 5.97E-14 1.31 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX*AV-LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV-SA 29 5.97E 14 1.31 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FA!LS TO CLOSE 2.02E 02 ZO2M0001 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05 IWX EV-SA 30 5.45E-14 1.20 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX-KV1-GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 31 5.33E-14 1.17 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG MAN 00 BATTERY 081 UNAVAILABLE 2.70E 03 ED1M0003 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E 05 IWX FL-GP 31 4.85E 14 1.07 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01

!EV LCSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZC2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV-LA UNDERVOLTAGE RELAY DG1 FAILURE 4.36E 03 EC1REDG1GA COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 33 4.81E 14 1.06 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS SFW MOV V028 FAILS 10 OPEN 1.41E 02 FWM00028 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0

l Fito: 2ELOS 07. DES Crsated: Fri May 25 16:20:55 1996 Page 4 of 7 Length: 54788 bytes Queued: Fri May 24 17:25:02 1996 34 4.81E 14 1.06 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FA! LURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 35 4.81E 14 1.06 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF PRNR A0Vs 9.60E-05 PXX-AV LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 36 4.73E 14 1.04 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02

'Zo2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX KV1-GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 37 4.20E 14

.92 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE '

4.60E 02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA UNDERVOLTAGE RELAY DG1 FAILURE 4.36E-03 EC1REDG1GA COMMON CAU$2 FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX EV SA 38 4.17E 14

.92 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA HARCWARE FAILURE OF NORMAL RHR !$0LAT10N MOV 011 1.41E-02 RN11M003 COMMr4 CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 39 4.17E-14

.92 INTI ATING EVENT LOSS OF 0FFGITE POWER EVENT OCCURS 1.20E-01 IEV LOSP 4

SAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05 IWX-EV SA 40 4.17E-14

.92 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01

!EV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA f

.41 3.45E-14

.76 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO REC 0VER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 BREAKER 200 FAILS TO OPEN (#3,5) 4.20E 03 EC2CB200VO COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX-AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SP0 3.40E 02 RNAM0006 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 42 3.23E 14

.71 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO REC 0VER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RhR 2.90E-03 RHN-MAN 01 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 43 3.00E-14

.66 INITIAflHG EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS STANOBY DG UNAVAILABLE DUE TO TEST AND MAlWTENANCE 4.60E 02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS013fM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 44 2.99E-14

.66 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 BREAKER 200 FAILS TO OPEN (#3,5) 4.20E 03 EC2CB200VO COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SP0 3.40E 02 RNAM0006 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 45 2.90E 14

.64 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP

File: 2ELOS 07. DES Crs:ted: Fri May 25 16:20:54 1996 Page 5 of 7 Length: 54788 byt:s Queued: Fri May 24 17:25:02 1996 FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-ROS BUS 1D50-05 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX-FL-GP 46 2.90E-14

.64 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS BUS 10S0 0D 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDOBS001TM COMMON CAUSE FA! LURE OF PRHR ADVs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL-GP 47 2.90E 14

.64 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITF AC POWER IN 30 MINUTES 7.00E 01 OTH ROS BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 100BSDK1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV-LA COMMON CAUSE FAILURE OF STRAINER $ IN 1RWST TANK 1.20E 05 IWX FL GP 48 2.86E 14

.63 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS STANOBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo20G002TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N-RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E-02 RNAM0009 HARDWARE FAILURE OF N RHR VALVES ON DVI LINE 8 (V 0158 & 0178) 5.07E-02 RNBM0010 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 49 2.80E-14

.62 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT DCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV-LA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E 03 RHN MAN 01 COMMON CAUSE FAILURE OF 4 IRWST INJECT!DN SQUIB VALVES 2.60E-05 IWX-EV SA 50 2.78E*14

.61 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS OPERAirR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG-MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW SASIN 4.00E-02 SWN MANO3 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA HARDWARE FAILURE OF NORMAL RHR ISOLAfl0N MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 51 2.78E-14

.61 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-ROS OPERAfont FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E 02 SWN-MANO3 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAU$E FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 52 2.78E-14

.61 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01

!EV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 DPERATOR FAILS To LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG-MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW 8ASIN 4.00E 02 SWN MANO3 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V023 FT0/C8 FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX+CV A0 53 2.76E 14

.61 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS DG FAILS TO START & RUN OR 8KR 202 FAILS TO CLOSE 2.02E-02 202M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF STRA!NERS IN IRWST TANK 1.20E 05 IWX FL GP

)

56 2.76E 14

.61 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BER 202 FAILS TO CLOSE 2.02E 02 202M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V022 FT0/C8 FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E-05 IWX-FL-GP 55 2.76E 14

.61 INIT!ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 202M0001 COMMON CAUSE FAILURE OF PRNR ADVs 9.60E-05 PXX-AV-LA HARDWARE FAILURE OF N RHR MOV V023 FT0/C8 FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX-FL-CP 56 2.60E 14

.57 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP

File: 2ELOS 07. DES Created: Fri Kry 24 16:20:54 1996 Page 6 of 7 Length: 54788 bytes cueued: Fri Aay 24 17:25:02 1996 FAILURE TO RECOVER OFFSITE AC POWER 14 30 MUSTES 7.00E-01 OTH-ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DG002TM i

COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA l

BUS UNAVAILABLE DUE TO UNSCHEDULED MA&NTENANCE 2.70E 03 EC18$013TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX-EV SA 57 2.48E-14

.55 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER [N 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM 1

COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF N RNR VALVES ON DVI LINE A (V 015A & 017A) 5.07E 02 RNAMOD09 l

HARDWARE FAILURE OF N RHR VALVES ON DV! LINE B (V 015B & 017B) 5.07E-02 RNBM0010

)'

COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA

'58 2.41E-14

.53 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG-MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E-02 SWW MANO3 COMMON CAUSE FAILURE OF PRNR ADVs 9.60E 05 PXX AV-LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.412-02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 59 2.41E 14

.53 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01

!EV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 M!duTES 7.00E-01 OTH ROS OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E-02 SWN MANO3 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V022 Fio/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX EV-SA 60 2.41E 14

.53 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG-MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E-02 SWb-MANO3 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECT!DN SQUIB VALVES 2.60E-05 IWX EV-SA f

61 2.39E-14

.53 !NITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS i

DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA COMMON CAUSE FAILURE OF N-RHR STOP CHECK VALVES V015A/B To OPEN 4.90E-03 RNX KV1 GO I

COMMON CAUSF FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 62 2.33E-14

.51 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 M!NUTFS 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 2020G002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA FAILURE OF OUTPUT LOGIC GROUP 1 1/0 2.09E 03 PL5M0011 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05' IWX-CV A0 63 2.33E-14

.51 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO REC 0VFR OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA FAILURE OF OUTPUT LOGlc GROUP 1 1/0 2.09E 03 PMDM0011 i

COMMON CAUSE FAILURE OF 4 1RWST INJECT!DN CHECK VALVES 3.00E 05 IWX-CV-A0 64 2.22E-14

.49 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 BATTERY DB1 UNAVAILABLE 2.70E 03 ED2M0003 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX-AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 65 2.22E 14 49 INITIATING EVENT

LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E*01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF PRNR ADVs 9.60E-05 PXX AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 COMMON CAUSE FAILURE OF 41RWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 66 2.18E-14 48 INITIATING EVENT - LOSS'0F OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LO$P FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNx-KV1-Go

File 2ELOS 07,0E5 creatW: Fri May 25 16:20:54 1996 Page 7 Cf 7 Length: 54788 bytes Queued: Fri May 25 17:25:02 1996 COMMON CAUSE FAILURE OF STRAINERS IN 1RWST TANK 1.20E 05 IWx.FL.cp O

Fils: 2C LO 04. DES Crected: Fri May 25 16:17:38 1996 Page 1 of 6 Length: 44571 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Titics AP600 7 Filt 2ENLO 04.WLK ( File created by linking nloca.in WLINK2 ** Ver. 4.02 **)

Reduced Sun of Cutsets: 3.2270E 09 NUMBER CUTSET PR08 PERCENT basic EVENT NAME EVENT PROS. IDENTIFIER 1

3.26E-10 10.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 2

3.26E 10 10.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/RELAT FTC 1.41E-02 RN22 MOD 4 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 3

3.26E 10 10.10 INITI ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 4

2.82E 10 8.74 INii!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX EV SA 5

2.82E 10 8.74 INITIATING EVENT INTERMCDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE OF N-RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX-EV SA 6

2.82E-10 8.74 INITIAT!NG EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05

!WX EV SA 7

1.30E 10 4.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E*05 IWX FL GP 8

1.30E 10 4.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E*04 IEV NLOCA HARDWARE FA! LURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURC OF STRAINERS IN IRWST TANK 1.20E 05 IWX FL-GP 9

1.30E 10 4.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF.N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF STRAINER $ IN !RWST TANK 1.20E 05 IWX-FL-GP 10 1.13E 10 3.50 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF N-RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX KVT GO COMMON CAUSE FA! LURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 11 9.81E 11 3.04 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMM0M CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E-03 RNX KV1-GO COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 12 6.70E-11 2.08 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E 03 RHN-MAN 01 COMMON CAUSE FAILURE OF 4 IRUST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 13 5.94E 11 1.84 INITIATING EVENT, INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF N*RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E-02 RNAMOD09 HARDWARE FAILURE OF N-RHR VALVES ON DV! LINE B (V 015B & 017B) 5.07E 02 RNBP0010 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 14 5.81E 11 1.80 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E 03 RHN MAN 01 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV-SA 15 5.15E 11 1.60 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF N RHR VALVES ON DV! LINE A (V 015A & 017A) 5.07E 02 RNAM0009 HARDWARE FAILURE OF N RHR VALVES ON DVI LINE B (V 0158 & 017B) 5.07E-02 RNBM0010 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA 16 4.53E 11 1.40 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E-03 RNX KV1 GO COMMON CAUSE FA! LURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX FL GP 17 4.04E 11 1.25 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75E-03 PNNCV013GO COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E 05 IWh CV A0

i files 2ENLO 04. DES Crected: Fri ?ty 24 16:17:38 1996 Page 2 of 6 Length: 44571 bytes Queued: Fri ty 2417:25:021996 18 3.50E 11 1.08 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75E 03 RNNCV013GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUl8 VALVES 2.60E 05 IWX EV SA 19 2.68E 11

.83 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E-03 RHN MAN 01 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX-FL GP 20 2.67E 11

.83 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N-RHR PUMP 01A FAILS /ST CK V007A/C8 FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 N RHR PUMP 01B FAILS /ST CK V0078/C8 FTC/RE FTC/C8 ECS221 SPO 3.40E-02 RNBMOD07 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 21 2.38E 11

.74 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF N RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E 02 RNAM0009 HARDWARE FAILURE OF N RHR VALVES ON DVI LINE B (V 0158 & 017B) 5.07 02

'RNBM0010 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E-05 IWX FL-GP 22 2.31E-11

.72 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 liv-NLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/C8 ECS122 CPO 3.40E 02 RNAMOD06 N RHR PUMP 01B FAILS /ST CK V0078/C8 FTC/RE FTC/C8 ECS221 SPO 3.40E-02 RNBM0007 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX-EV SA 23 1.7BE 11

.55 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF N RHR PUMPS TO START 7.70E 04 RNX-PM FS COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 24 1.62E 11

.50 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RNR CHECK VALVE V013 FAILURE TO OPEN 1.75E-03 RNNCV013GO COMMON CAUSE FAILURE OF STRA!NERS IN IRWST TANK 1.20E 05 IWX FL-GP 25 1.54E*11 48 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF N RHR PUMPS TO START 7.70E-04 RNX PM FS COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQU18 VALVES 2.60E 05 IWX EV-SA 26 1.41E-11

.44 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV 4LOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V007A/8 TO OPEN 6.10E 04 RNX KV Go COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX-CV A0 27 1.22E 11

.38 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF N RNR STOP CHECK VALVES V007A/8 TO OPEN 6.10E-04 RNX-KV GO COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 78 1.07E-11

.33 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOC'A N RNR PUMP 01A FAILS /ST CK V007A/C8 FTC/RE FTC/C8 ECS122 SPO 3.40E-02 RNAM0006 N RHR PUMP 01B FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SPO 3.40E 02 RNBM0007 COMMON CAUSE FAILURE OF STRA!NERS IN IRWST TANK 1.20E 05 IWX FL-GP

.29 7.11E 12

.22 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF N RHR PUMPS TO START 7.70E 04 RNX PM FS COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL-GP 30 6.93E 12

.21 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70F 04 IEV-NLOCA BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 31 6.93E 12

.21 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSA DD-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDA8SDDITM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 j

32 6.93E 12

.21 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA BUS IDSA DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDK1TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 33 6.93E 12

.21 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA BUS IDS 0 DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBS051TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 34 6.93E-12

.21 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA BUS IDSD DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDOBSDDITM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV-A0 35 6.93E 12

.21 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX CV-AO 36 6.01E 12

.19 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA

File: 2ENLO-04. DES Crceted: Fri M;y 25 14:17:38 1996 Page 3 of 6 Length: 44571 bytes Queued: Fri May 24 17:25:02 1996 BUU IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04

!DABSDS1TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION Sou!B VALVES 2.60E-05 IWX EV SA 37 6.01E-12

.19 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSA-DD 1 UNAVAILABLE DUE 70 TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDABSD01TM COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 38 6.01E-12

.19 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCUxS 7.70E-04 IEV NLOCA BUS IDSA-DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENAXCC 3.00E-04 IDABSDK1TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 39 6.01E 12

.19 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA BUS IDSD-DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV-SA 40 6.01E 12

.19 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA BUS 105D 001 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSD01TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05

.!WX EV SA 41 6.01E 12

.19 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV WLOCA BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX-EV SA 42 5.64E 12

.17 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V007A/B TO OPEN 6.10E 04 RNX-KV-Go COMMON'CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E-05 IWX FL-GP 43 5.54E 12

.17 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 44 4.80E 12

.15 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG COMMON CAUSE FAILURE OF 4 IRWST INJECTIOi SQUlB VALVES 2.60E-05 IWX EV-SA 45 3.95E 12

.12 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNBEP011SA COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 46 3.95E-12

.12 INIT!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNAEP022SA COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 47 3.95E 12

.12 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNDEP023SA COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 48 3.42E 12

.11 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNBEP011SA COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX-EV-SA 49 3.42E-12

.11 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNAEP022SA 4

COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 50 3.42E-12

.11 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNDEP023SA COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05 IWX EV-SA 51 3.26E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMAM001 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 52 3.26E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 LEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E 04 CCX PMDM001 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 53 3.26E 12

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PL4M001 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 54 2.82E 12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF UUTPUT LOGIC !/Os 1.41E-04 CCX PMAM001 COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQU!B VALVES 2.60E 05 IWX EV-SA 55 2.82E-12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMDM001 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA

File: 2ENLO 04. DES C m ted: Fri t y 24 16:17:38 1996 Page 4 cf 6 Length: 44571 bytes Gueued: Fri M y 24 17:25:02 1996 56 2.82E 12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC !/Os 1.41E 04 CCX PL4M001 COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUIB VALVES 2.60E-05 IWX-EV SA 57 2.77E-12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E 05 IWX-FL-GP 58 2.77E 12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSA DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IVABSDD1TM COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX FL GP 59 2.77E-12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA BUS IDSA DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDK1TM COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL GP 60

2. 77E -12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX-FL-GP 61 2.77E-12

.09 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA BUS 10$D 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDDITM COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX FL-GP 62 2.77E-12

.09 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA BUS UNAVAILABLE DUE TO TEST OR CURRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF STRAINERS IN IRWsf TANK 1.20E 05 IWX FL CP 63 2.24E 12

.07 INITIATING EVENT INTERMEDIATE LOCA EVENT Ot. CURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 COMMON CAUSE FAILURE OF 4 IRWST INJEC110N CH3CK VALVES 3.00E-05 IWX CV A0 64 2.24E-12

.07 INITI ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMD030 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 65 2.24E-12

.07 !NITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PL403 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 66 2.22E-12

.07 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 NEB-PLUG COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL-CP 67 2.12E 12

.07 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA N RNR PUMP 018 FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SPO 3.40E 02 RNBMOD07 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE '

2.70E 03 EC1BS001TM l

COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 68 2.12E-12

.07 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E IEV-NLOCA N RHR PUMP 018 FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SP0 3.40E-02 RNBM0007 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 69 2.12E-12

.07 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N-RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2B5002TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 70 2.12E-12

.07 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SP0 3.40E 02 RNAM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 71 1.94E-12

.06 INIT!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 COMMON CAUSE FAILURE OF 41RWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 72 1.94E 12

.06 INITIATING EVENT INTERMEDI ATE LOCA EVENT XCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMD030 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX EV SA 73 1.94E 12

.06 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PL403 COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUIB VALVES 2.60E-05 IWX EV SA 74 1.84E 12

.06 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA

File: 2ENLO 04. DES Crested: Fri M:y 24 16:17:38 1996 Page 5 of 6 Length: 44571 byta Queued: Fri May 26 17:23:02 1996 N RHR PUMP 01B FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SP0 3.40E 02 RNBM0007 UNAVAILABILITY OF BUS ECS ES 1 DUE To UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E-05 IWX EV-SA 75 1.84E-12

.06 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUMP 01B FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SPO 3.40E-02 RNBM0007 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013fM COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUIB VALVES 2.60E 05 IWX EV-SA 76 1.84E 12

.06 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPD 3.40E-02 RNAM0006 UNAVAILABILITT OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV SA 77 1.84E-12

.06 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N-RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023fM COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV SA 78 1.58E 12

.05 INITIATING EVENT

INTI(MEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNBEP011SA COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX-FL-GP 79

'1.58E 12

.05 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNAEP022SA COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL-GP 80 1.58E-12

.05 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF OUTPUT ORIVER 1.71E 04 RNDEP023SA COMMON CAUSE FAILURE OF $TRA!NERS IN IRWST TANK 1.20E 05 IWX FL GP 81 1.30E 12

.04 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E 05 IWX FL-GP 82 1.30E 12

.04 (NITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E-04 CCX PMOM001 COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX FL GP 83 1.30E-12

.04 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FA! LURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PL4M001 COMMON CAUSE FAILURE OF STRAINERS IN 1RWST TANK 1.20E 05 IWX FL GP 84 1.18E-12

.04 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF W RHR CHECK VALVES V017A/B TO OPEN 5.10E 05 RNX CV-GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 85 1.15E 12

.04 INITIATlWG EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E 05 CCX-PMAM004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 86 1.15E 12

.04 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E-05 CCX-PMDM004 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 87 1.15E 12

.04 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E-05 CCX PLMM004 I

COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 1

88 1.04E-12

.03 INITIATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS To OPEN 1.20E 02 IRWM0003 OPERATOR FAILS TO THROTTLE NORMAL RHR PUMP DISCHARGE VALVE V011 3.75 E-03 RHN MAN 06 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 89 1.02E 12

.03 INIT! ATING EVENT

INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF N-RNR CHECK VALVES V017A/B TO OPEN 5.10E-05 RNX CV Go COMMON CAUSE FAILURE OF 4 1RWST INJECTION SQUIB VALVES 2.60E 05 IWX EV SA 90 9.97E 13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E 05 CCX PMAM004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05 IWX EV SA 91 9.97E 13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E 05 CCX PMCM004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 92 9.97E 13

.03 INITI ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E 05 CCX-PLMM004

Fils: 2EILO 04. DES Cre:ted: Fri May 24 16:17:38 1996 Page 6 of 6 Length: 44571 bytes Queued: Fri M;y 26 17:25:02 1996 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 93 9.01E 13

.03 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003

.HN MAN 06 OPERATOR FAILS TO THROTTLE NORMAL RHR PUMP DISCHARGE VALVE V011 3.75E 03 9

COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUIB VALVES 2.60E 05

!WA EV SA 94 8.95E 13

.03 INITIATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E 05 IWX FL-GP 95 8.95E-13

.03 [NITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS

' 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMD030 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E 05 IWX FL GP 96 8.95E 13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PL403 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX FL GP 97 8.48E-13

.03 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEY-NLOCA N-RHR PUMP 018 FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SP0 3.40E 02 RNBM0007 UNAVAILABILITT OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX-FL GP 98 8.48E 13

.03 INITIATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA N RHR PUMP 01B FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SP0 3.40E 02 RNBM0007 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013TM COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05

!WX FL-GP 99 8.48E-13

.03 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 UNAVAILABILITT OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E-05 IWX FL-GP 100 8.48E-13

.03 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUNP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SP0 3.40E 02 RNAM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023TM COMMON CAUSE FAILURE OF STRAINER $ IN IRWST TANK 1.20E 05 IWX-FL-GP i

Filct 2ESIL*02. DES Crc:ted: Fri May 24 16:17:48 1996 Page 1 of 6 Length: 46078 bytes Queued: Fri M.y 2617:25:021996

- - - - DUMINANT CUTSETS *****

Page:

1

Title:

AP600 7 Files 2ESIL 02.WLK ( File created by linking si lb.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 3.4270E 08 NUM8ER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

2.50E 08 72.95 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI L8 IWRST DISCHARGE LINE "A" STRAINER PLUGGED 2.40E 04 IWA PLUG 2

3,12E 09 9.10 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-SI LB COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX CV A0 3

2.70E-09 7.88 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St LB COMMON CAUSE FAILURE OF 4 !RWST INJECTION SQUlB VALVES 2.60E-05

'IWX EV SA 4

1.04E*D9 3.03 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-St LB COMMON CAUSE FAILURE OF 2 IRWST INJEC. SQUlBS IN 1 LINE TO OPEN 1.00E-05 IWX EV1 SA 5

3,19E 10

.93 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACv122A0 IRWST CHECK VALVE 124A FAILS TO OPEN

1. 75E *03 IWACV124A0 6

2.66E 10

.78 INITIAflNG EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E-03 IWACv122A0 HARDWARE FAILURE OF IRWST VALVE 125A 1.46E-03 IRWM0006 7

2.66E 10

.78 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB HARDWARE FAILURE OF 1RWST VALVE 123A 1.46E 03 IRWM0005 1RWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 8

2.22E 10

.65 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI L8 HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 9

1.59E 10

.46 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACv122A0 RELAY FAILS TO OPERATE 8.76E 04 IWDR$125AFA 10 1.59E 10 46 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 RELAY FAILS TO OPERATE 8.76E-04 IWBRS123AFA 11 1.33E 10

.39 INITI ATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E-03

!RWM0005 RELAT FAILS TO OPERATE 8.76E-04 IWDRS125AFA

.12 1.33E 10

.39 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWMOD06 RELAY FAILS TO OPERATE 8.76E 04 IWBRS123AFA 13 7.98E 11

.23 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI LB RELAY FAILS TO OPERATE 8.76E 04 IWBRS123AFA RELAY FAILS TO OPERATE 8.76E 04 IWORS125AFA 14 5.62E 11

.16 INITIATING EVENT

SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-St-LB COMMON CAUSE FAILURE OF IRWST INJECTION CVs IN 1 LINE TO OPEN 5.40E-07

!WX CV1 A0 15 5.46E 11

.16 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB IRWST CHECK VALVE 122A FAILS TO OPEN

1. 75 E-03 (WACV122A0 BUS 10S0 051 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 ID0BSDS1TM 16 5.46E 11

.16 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 BUS IDSD DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBS001TM 17 5.46E-11

.16 INITIATING EVENT

SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-L8 1RWST CHECK VALVE 124A FAILS TO OPEN

1. 75E-03

!WACV124A0 SUS 10SB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM 18 5.46E 11

.16 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-S! LB IRWST CHECK VALVE 124A FAILS TO OPEN

1. 75E-03 IWACV124A0 BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDDITM 19 4.56E 11

.13 INITI ATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI L8 HARDWARE FAILURE OF IRWST VALVE 123A 1.46E-03 IRWM0005

Files 2ESIL 02. DES Crocted: Fri f*ay 24 16:17:(8 1996 Page 2 of 6 Length: 46078 bytes Queued: Fri M y 24 17:25:02 1996 BUS 10$D 05 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDSITM 20 4.56E 11

.13 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04

[EV St LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 i

BUS 1050 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDD1TM 21 4.56E 11

.13 INITIATING EVENT - $AFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 BUS IDSB-0$ 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDSITM 22 4.56E 11

.13 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWMOD06 BUS 10S8 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDDITM 23 2.73E 11

.08 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB RELAY FAILS TO OPERATE 8.76E-04 IWDRS125AFA BUS !DSB DS 1 UNAVAILABLE DUE To TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM 24 2.73E 11

.08 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB RELAY FAILS TO OPERATE 8.76E-04 IWDR$125AFA BUS !DSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDDITM 25 2.73E 11

.08 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 ICV St LB RELAY FAILS TO OPERATE 8.76E-04 IWBR$123AFA BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM 26 2.73E 11

.08 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB RELAY FAILS TO OPERATE 8.76E 04 IWBR$123AFA BUS IDSD DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSD01TM 27 1.32E 11

,04 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY.0F BUG ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2B5002TM 28 1.32E 11

.04 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM 29 1.32E 11

.04 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX 0Y PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM 30 9.36E 12

.03 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St LB BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDSITM BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSOSITM 31 9.36E 12

.03 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St-LB BUS 10$8 D5 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM BUS 10$D 0D 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDDITM j

32 9.36E 12

.03 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB l

BUS 10S8 00-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM l

BUS IDED DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM 33 9.36E 12

.03 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB BUS 10$8 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDD1TM BUS 1050 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBS001TM 34 2.18E 12

.01 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 FUSE DISCONNECT SWITCH (FD19) SPURIOUSLY OPENS 1.20E 05 IDDFD019RQ 35 2.18E-12

.01 INITIATING EVENT

SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 FUSE DISCONNECT SWITCH (F013) SPURIOUSLY OPENS 1.20E 05 IDBFD013RQ 36 1.82E 12

.01 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St-LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 FUSE DISCONNECT SWITCH (FD19) SPURIOUSLY OPENS 1.20E 05 IDDF0019RQ 37 1.82E 12

.01 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St-LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 FUSE DISCONNECT SWITCH (F013) SPURIOUSLY OPENS 1.20E-05 IDBFD013RQ 38 1.14E 12

.00 INIT!ATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 Zo2DG002TM MAIN GEN. BKR ES 01 FAILS TO OPEN l# 12]

5.08E 03 ECOM0001

File: 2ES!L 02. DES Cre:ted: Fri May 26 16:17:18 1996 Page 3 of 6 Length: 46078 bytes Queued: Fri M;y 24 17:25:02 1996 39 1.09E 12

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK CVENT OCCURS 1.04E 04 IEV SI LB RELAY FAILS TO OPERATE 8.76E 04 IWDRS125AFA FUSE DISCONNECT SWITCH (FD13) SPURIOUSLY OPENS 1.20E 05 IDBF0013RQ 40 1.09E 12

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB I

J RELAY FAILS TO OPERATE 8.76E 04 IWBR$123AFA FUSE DISCONNECT SWITCH (F019) SPURIOUSLY OPENS 1.20E 05 IDDFD019RQ 41 8.74E*13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV S! LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 BUS 1050-05 1 FAILS (ALL MODES) 4.80E 06 IDDBSDS1LF 42 8.74E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 BUS 1050 0D 1 FAILS (ALL MODES) 4.80E 06 IDDBSDD1LF 43 8.74E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St-LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 BUS 1058 05 1 FAILS (ALL MODES) 4.80E 06

!DBBSDS1LF 44 8.74E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACv124A0 BUS 1058 0D 1 FAILS (ALL MODES) 4.80E 06 IDBBSDD1LF 45 7.29E 13

.00 INITIATING EVENT SAFETY INJECTION LINE 8REAK EVENT OCCURS 1.04E-04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E-03 1RWMcD05 BUS IDSD DS-1 FAILS (ALL MODES) 4.80E 06 IDDBSDS1LF 46 7.29E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 1RWM0005 BUS 10S0 00 1 FAILS (ALL MODES) 4.80E 06 IDDBSD01LF 47 7.29E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWMOD06 BUS IDSB DS 1 FAILS (ALL MODES) 4.80E 06 IDBBSDS1LF 48 7.29E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 BUS IDSB DD 1 FAILS (ALL MODES) 4.80E-06 IDBBSDD1LF 49 5.02E 13

.00 INITIAflWG EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 ZO2 MOD 01 MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E 03 ECOMOD01 50 4.37E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St-LB RELAY FAILS TO OPERATE 8.76E-04 IWDR$125AFA BUS IDSB DS 1 FAILS (ALL MODES) 4.80E-06 IDBBSDS1LF

$1 4.37E -13

.00 INITIAT!hG EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E IEV SI LB RELAY FAILS TO OPERATE 8.76E-04 IWDRS125AFA BUS IDSB DD 1 FAILS (ALL MODES) 4.80E 06 IDBBSDD1LF 52 4.37E 13

.00 INITIATING EVENT

SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB RELAY FAILS TO OPERATE 8.76E 04

!WBRS123AFA BUS 10S0 0S 1 FAILS (ALL MODES) 4.80E-06 IDDBSDS1LF 53 4.37E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB RELAY FAILS TO OPERATE 8.76E 04 IWBRS123AFA BUS 1D$0 0D 1 FAILS (ALL MODES) 4.80E 06 IDDBSDD1LF 54 3.74E 13

.00 INITIATING EVENT - $AFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM FUSE DISCONNECT SWITCH (FD19) SPURIOUSLY OPENS 1.20E 05 IDDFD019RQ 53 3.74E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDDITM FUSE DISCONNECT SWITCH (FD19) SPURIOUSLY OPENS 1.20E 05 IDDFD019RQ 56 3.74E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB FUSE DISCONNECT SWITCH (FD13) SPURIOUSLY OPENS 1.20E 05 IDBF0013RQ BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM 57 3.74E-13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB FUSE DISCONNECT SWITCH (FD13) SPURIOUSLY OPENS 1.20E 05 (DBFD013RQ BUS 10$D 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDD1TM

File: 2ES!L 02. DES Crscred: Fri M:y 24 16:17:48 1996 Page 4 of 6 Length: 46078 bytes Queueds. Fri May 24 17:25:02 1996 58 3.61E 13

.00 INITIATING EVENT - SAFETY INJECTIOM LINE BREAK EVENT OCCURS 1.04E-04

[EV SI-LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACv122A0 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123BSA 59 3.61E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACVl24A0 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS FAILURE OF OUTPUT DRIVER 1.71E-04 IRSEP123ASA 60 3.11E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04

[EV-SI-LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACv122A0 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123BSA 61 3.11E-13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVFNT OCCURS 1.04E 04 IEV-SI-LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACv124A0 FAILURE OF MANUAL DAS PARDWARE 1.00E 02 MDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123ASA 62 3.01E-13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS FAILURE OF OUTPUT DRIVER 1.71E 04 1RBEP123BSA 63 3.01E 13'

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB HARDWARE FAILURF OF IRWST VALVE 125A 1.66E-03 IRWM0006 i.

OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANOAS FAILURE OF OUTPUT DRIVER 1.71E-04 IRBEP123ASA 64 2.98E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV S!-LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E 04 CCX PMDM001 i

65 2.98E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB IRWST CHECK VALVE 124A FAILS TO OPEN 1.75E 03 IWACV124A0 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 66 2.60E*13

.00 INITIATING EVENT - SAFETY INJEC110N LINE BREAK EVENT OCCURS 1.04E 04 IEV-St LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123BSA 67 2.60E-13

.00 INITIAi!NG EVCNT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 J

FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123ASA 68 2.57E 13

.00 INITI ATING EVENT SAFETY INJECTION Ll.NE BREAK EVENT OCCURS 1.04E 04 IEV-SI LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03 IWACV122A0 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FA! LURE OF OUTPUT LOGIC 1/Os 1.41E-04 CCX PMDM001 69 2.57E-13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB I

1RWST CHECK VALVE 124A FAILS TO OPEN

1. 75 E-03 IWACV124A0 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 70 2.4BE 13

.00 INIT!ATING EVENT - SAFETY INJECil0N LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB HARDWARE FAILURE OF 1RWST VALVE 123A 1.46E 03 IRWM0005 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMDM001 71 2.48E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-St-LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 l

72 2.35E 13 00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN FIXED COMPONENT FAULTS 4.80E-05 EC2M0022 73 2.14E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMDM001

Files 2ESIL 02. DES Crccted: Fri M;y 2516:17:(81996 Pese 5 of 6 Length: 46078 bytes Queued: Fri May 24 17:25:02 1996 74 2.14E 13

.00 INITI ATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 IRWM0006 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF OU1PJT LOGIC I/Os 1.41E-04 CCX PMBM001 1

75 2.05E-13

.00 INITIATING EVENT SAFETY INJECTION LINE BRE!.K EVENT OCCURS

1. 04E - 04 IEV SI LB IRWST CHECK VALVE 122A FAILS TO OPEN 1.75E 03

!WACV122A0 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAk DNLf 1.16E 02 REC-MANDAS COMMON CAUSE FAILURE OF OUTPUY LOGIC GROUPS 9.69E 05 CCX PM0030 76 2.05E 13

.00 INITI ATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 LEV SI LB IRWST CHECK VALVE 124A FAILS TO OPEN

1. 75E-03 IWACV124A0 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMB030 77 1.81E-13

.00 INITI ATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-SI-LB RELAY FAILS TO OPERATE A.76E-04 IWDRS125AFA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123ASA 78 1.81E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS

1. 04E-04 IEV-SI LB RELAY FAILS TO OPERATE 8.76E-04 IWBRS123AFA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123BSA 79

'1.76E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-SI-LB IRWST CHECK VALVE 122A FAILS TO OPEN

1. 75E-03 IWACV122A0 FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMD030 80 1.76E 13

.00 INITI ATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB IRWST CHECK VALVE 124A FAILS TO OPEN

1. 75E-03 IWACV124A0 FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAJSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PM8030 81 1.71E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB 1.46E 03 IRWM0005 HARDWARE FAILURE OF IRWST VALVE 123A OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PM0030 83 1.71E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB HARDWARE FAILURE OF IRWST VALVE 125A 1.46E 03 1RWM0006 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMB030 83 1.56E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS

1. 04E - 04 IEV-SI-LB RELAY FAILS TO OPERATE 8.76E-0.

IWDRS125AFA FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS FAILURE OF OUTPUT DRIVER 1.71E 04 IRBEP123ASA 64 1.56E 13

.00 INITI ATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB RELAY FAILS TO OPERATE 8.76E 04 IWBRS123AFA FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS FAILURE OF OUTPUT DRIVER 1.71E-04

!RBEP123BSA 85 1.50E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB BUS 10$8 D5 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM BUS IDSD DS 1 FAILS (ALL MODES) 4.80E-06 IDDBSDSILF 86 1.50E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 LEV-St-LB BUS IDSB-DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDS1TM BUS IDSD DD-1 FAILS (ALL MODES) 4.80E 06 IDDBSDD1LF c7 1.50E 13

.00 INITI ATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM BUS 1D50-05 1 FAILS (ALL MODES) 4.80E 06 IDDBSDS1LF 88 1.50E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-SI-LB BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM BUS 1D50 0D 1 FAILS (ALL MODES) 4.80E 06 IDDBS001LF 89 1.50E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB BUS IDSB-DS 1 FAILS (ALL MODES) 4.80E-06 IDBBSDC1LF BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDS1TM 90 1.50E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV St-LB BUS IDSB DS 1 FAILS (ALL MODES) 4.80E 06 IDBBSDS1LF

i File: 2EslL 02. DES Crscted: Fri May 24 16:17:48 1996 Page 6 of 6 Length: 46075 bytes Oueued: Fri May 24 17:25:02 1996 BUS !DSD DD*1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBS001TM 91 1.50E 13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB BUS IDSB DD 1 FAILS (ALL MODES) 4.80E-06 IDBBSDD1LF BUS IDSD DS-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM 92 1.50E-13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI LB BUS 1058 00 1 FAILS (ALL MODES) 4.80E-06 IDB8SDDILF BUS IDSD DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDDITM 93 1.49E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB RELAY FAILS TO OPERATE 8.76E 04 IWDRS125AFA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 94 1.49E 13

.00 INIT!ATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB RELAY FAILS TO OPERATE 8.76E 04 IWBR$123AFA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS COMMON CAUSE FAILURE OF QUTPUT LOGIC I/Os 1.41E 04 CCX PMDMOD1 i

95 1.47E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-St LB HARDWARE FAILURE OF IRWST VALVE 123A 1.46E 03 IRWM0005 FAILURE OF MANUAL DAS MARDU RE 1.00E 02 MDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM0030 96 1.47E-13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI LB e

HARDWARE FAILURE OF 1RWST VALVE 125A 1.46E 03

!RWM0006 FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 1

COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 h

97 1.28E 13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV S! LB RELAY FAILS TO OPERATE 8.76E-04 IWDRS125AFA FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 98 1.28E-13

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB RELAY FAILS TO OPERATE 8.76E 04 IWBRS123AFA f

FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FATLURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX-PMDM001 99 1.04E 13

.00 INITIATING EVENF - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BREAKER 200 FAILS TO OPEN (#3,5) 4.20E 03 EC2CB200VO MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E 03 ECOM0001 4

100 1.02E-13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK CVENT OCCURS 1.04E-04 IEV-SI-LB RELAY FAILS TO OPERATE 8.76E-04 IWDRS125AFA OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS i 69E-05 CCX PMB030 4

4

~

File: 2LCMT 03. DES Crceted: Fri May 25 16:18:20 1996 Page 1 of 7 Length: 51147 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *"**

Page:

1 Titte: AP600 7 Fils: 2LCMT 03.WLK ( File created by linking cmttb.in WLINK2 ** Ver. 4.02 ")

Reduced Sun of Cutsets: 2.8250E 09 NUMBER. CUTSET PROS PERCENT SASIC EVENT NAME EVENT PR06. IDENTIFIER 1

2.32E 09 82.12 INITIATING EVENT

CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF 4 SQUI8 VALVES IN RECIRC LINES 2.60E-05

!WX Ev4 SA 2

4.27E 10 15.12 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E 02 REN MAN 04 3

1.51E 11

.53 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE OF NORMAL RHR !$0LAT10N MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 4

'1.51E-11

.O INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FA! LURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 5

1.51E 11

.53 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB HARDWARE FAILURE OF N RHR MOV V023 FT0/C8 FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 6

5.26E-12

.19 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTL8 COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/8 TO OPEN 4.90E 03 RNX-KV1 Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 7

5.15E 12

.18 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 8

3.11E-12

.11 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E-03 RHN MAN 01 C00040N CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 9

2.76E 12

.10 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE OF N RHR VALVES ON DV! LINE A (V 015A & 017A) 5.0TE 02 RNAM0009 HARDWARE FAILURE OF N RHR VALVES ON DV! LINE B (V 0158 & 0178) 5.07E 02 RNBM0010 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP

)

10 1.88E-12

.07 INITIATING EVENT - CM1 LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTL8 N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75 E* 03 RNNCV013Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLl>GGING 1.20E 05 REX FL GP 11 1.64E 12

.06 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-XMTR COMMON CAUSE FAILURE OF CONTAINMENT SUMP LEVEL TRANSMITTERS 3.84E-05 CCX-VS FA 12 1.24E 12

.04 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB N RHR PUMP 01A FAILS /ST CK V007A/C8 FTC/RE FTC/CB ECS122 SP0 3.40E 02 RNAM0006 N RHR PUMP 018 FAILS /ST CK V0078/C8 FTC/RE FTC/C8 ECS221 SP0 3.40E 02 RN8M0007 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 13 8.26E-13

.03 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB C0pO90N CAUSE FAILURE OF N RHR PUMPS TO START 7.70E-04 RNX PM FS COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 14 6.54E 13

.02 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V007A/S TO OPEN 6.10E-04 RNX KV G0 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGOING 1.20E 05 REX FL GP 15 4.70E 13

.02 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001-S COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR 16 4.70E 13

.02 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA, 1.10E-05 CCX PMXM004 5 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR 17 4.51E 13

.02 INITIATING EVENT - CMT LINE BREAT EVENT OCCURS 8.94E 05 IEV CMTLB

$ UMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001

File: 2LCMT 03. DES Cre:ted: Fri May 25 16:18:20 1996 Page 2 of 7 Length: 51147 bytes Queued: Fri May 24 17:25:02 1996 18 4.51E 13

.02 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTL8 HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 HARCWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 19 3.76E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05

!EV CMTLB SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWH0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FA!LS TO OPEN 1.20E 02 IRwo001 20 3.76E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05

!EV-CMTL8 HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWMOD03 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 21 3.68E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP-SAM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04

!WX XMTR 22 3.22E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 23 3.22E 13

.01 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB BUS IDSA DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDASS001TM COMMON CAUSE FAILURE OF REC!RC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 24 3.22E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB BUS IDSA-DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 ID ABSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 25 3.22E-13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB BUS 1D50 05 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDOBSOSITM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 26 3.Z2E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB BUS IDSD DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDD1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 27 3.22E 13

.01 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP i

28 2.57E 13

.01 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTL8 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 RE8 PLUG COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 29 2.26E 13

.01 INIT!ATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWDRS120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWMOD01 30 2.26E-13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLS HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWMOD03 RELAY FAILS TO OPERATE 8.76E 04 IWCR$1208FA SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 31 1.83E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB FAILURE OF OUTPUT DRIVER 1.71E 04 RN8EP011SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 32 1.83E-13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB FAILURE OF OUTPUT DRIVER 1.71E-04 RNAEP022SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.2CE 05 REX FL GP 33 1.83E 13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB FAILURE OF OUTPUT DRIVER 1.71E-04 RNDEP023SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO Suk.* SCREEN PLUGGING 1.20E-05 REX FL GP li 1.51E 13

.01 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX FMAM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 35 1.51E-13

.01 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMOM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUhP SCREEN PLUGGING 1.20E 05 REX FL CP

i file: 2LCMT 03. DES Crested: Fri M;y Zh 16:18:20 1996 Page 3 of 7 Length: 51147 bytes cueued: Fri tay 24 17:25:02 1996 36 1.51E-13

.01 INITI ATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTL8 COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E 04 CCX PL4M001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 37 1.04E 13

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 38 1.04E 13

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMD030 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP t

39 1.04E 13

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PL403 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP l

40 9.85E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB N RHR PUMP 018 FAILS /ST CK V0078/C8 FTC/RE FTC/CB ECS221 SP0 3.40E-02 RNBM0007 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC18S001TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 41 9.85E 14

.0G INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB N RHR PUMP 018 FAILS /ST CK V0078/C8 FTC/RE FTC/C8 ECS221 SPO 3.40E-02 RNBM0007 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013fM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 42 9.85E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB N RNR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/C8 ECS122 SPO 3.40E 02 RNAMOD06 UNAVAILABILITT OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC28S002TM COMMON,CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 43 9.85E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLS N RHR PUMP 01A FAILS /ST CK'V007A/C8 FTC/RE FTC/CB ECS122 SP0 3.40E-02 RNAM0006 8US UNAVAILA8LE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC28$023fM COMMON CAUSE FAILURE OF RECIRC LINES DOE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 44 7.72E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB BUS 10SD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDOBSDS1TM SUNP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 3

45 7.72E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB BUS 10$D 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDD8S001TM SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB-PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 46 7.72E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLS HARDWARE FAliURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDS1TM SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 47 7.72E-14

.00 INITI ATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 BUS UNAVA!LABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSD01Th SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 48 5.48E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB SUMP SCREEN 8 PLUCS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQU18 VALVE 118A 1.46E 03 IRWM0009 49 5.4SE 14

.00 INITIATING EVENT CMT LINE 8REAK EVENT OCCURS 8.94E 05 IEV CMTLB HARDWARE FAILURE OF IRWST SQUIB VALVE 1188 1.46E 03 IRWM0011 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119G0 i

SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 50 5.47E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF N RHR CHECK VALVES V017A/B To OPEN 5.10E 05 RNX CV GO f

COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 51 5.34E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF. MUX LOGIC GROUPS 4.98E 05 CCX PMAM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGlWG 1.20E 05 REX FL-GP

$2 5.34E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.9BE 05 CCX-PMDM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP

FILo: 2LCMT 03. DES Crected: Fri May 24 16:18:20 1996 Page 4 of 7 Lengths 51147 bytes Queued: Fri May 24 17:25:02 1996 53 5.34E 14 00 INITI ATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E-05 CCX PLMM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 54 5.13E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX CFTW COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR 55 4.83E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB HARDWARE FA! LURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 OPERATOR FAILS TO THROTTLE NORMAL RHR PUMP DISCHARGE VALVE V011 3.75E-03 RHN MAN 06 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP

$6 4.57E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB l

SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 1RWM0010 HARDWARE FAILURE OF IRWST SQUld VALVE 118A 1.46E-03 IRWM0009 57 4.57E-14

.00 INITIATING EVENT CMf 1E BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB HARDWARE FAILURE OF IRvst SQUlB VALVE 1188 1.46E-03 IRWM0011 HARDWARE FAILURE OF IRWST SQUIB VALVE 120B 1.46E 03 IRWM0012 1

SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG l

58 4.27E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB FAILURE OF PMS, PLS AND DAS INDICATION FOR OPERATOR ACTIONS 1.00E-06 ALL*lND FAIL i

COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR l

59 3.94E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO l

HARDWARE FAILURE CAUSE RFCIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 60 3.86E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB i

COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 1194 FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO 61 3.86E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E*03 REACV119GO 62 3.29E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB l

SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO RELAT FAILS TO OPERATE 8.76E-04 IWBRS118AFA l

63 3.29E 14

.00 INIT!ATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCv119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWMOD10 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 l

64 3.29E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003

(

HARDWARE FAILURE OF IRWST SQUID VALVE 1208 1.46E 03 1RWMOD12 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWMOD01 63 3.29E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB RELAT FAILS TO OPERATE 8.76E-04 IWAR$118BFA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA 1) LUG 66 3.22E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWMOD12 67 3.22E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMAM001 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO 68 3.22E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLS HARDWARE FAILURE CAUSE RECIRC. CV 1198 FA!LS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF QUTPUT LOGIC 1/Os 1.41E-04 CCX-PMBM001

File: 2LCMT 03. DES Crated: Fri May 24 16:18:20 1996 Pa9e 5 of 7 Length: 51147 bytts Queued: Fri m y 24 17:25:02 1996 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 1RWM0010 69 3.22E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 CCMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 70 2.74E-14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB

$ UMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWDRS120AFA HARDWARE FAILURE OF IRWST SQUlB VALVE 118A 1.46E-03 IRWM0009 71 2.74E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB SUMP SCREEN B PLUGS AND PREVENTS (LOW 2.40E 04 REB PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 RELAY FAILS TO OPERATE 8.76E-04' IWBR$118AFA T2 2.74E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E 03 1RWM0012 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 73 2.74E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE OF IRWST SQUlB VALVE 118B 1.46E-03 1RWMOD11 RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 74 2.74E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB RELAY FAILS TO OPERATE 8.76E-04 IWAR$118BFA HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWMOD12 l

SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG 75 2.69E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E-03 IRWM0012 76 2.69E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1,41E-04 CCX FMBM001 i

HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 l

77 2.65E 14

.00 INIT!ATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMA030 l

HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO l

HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO 77, 2.65E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E CCX-PMB030 HARDWARE FAILURE CAUSE RECIRC. CJ 119A FAILS TO OPEN 1.75E 03 REACV119Go 79 2.25E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 1RWMOD03 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-CP 80 2.21E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARE FAILURE OF 1RWST SQUIB VALVE 1208 1.46E 03 IRWMOD12 81 2.21E-14

.00 INITIATING EVfNT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB COMMON Ct':SE FAILURE OF DJTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119Go 82 2.21E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PMB030 HARDWARE FAILURE OF IRWST SQU!B VALVE 120A 1.46E-03 1RWM0010 83 2.21E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE OF 1RWST SQUIB VALVE 120B 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PMB030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS To OPEN 1.75E 03 REACV119CO

1 File: 2LCMT 03. DES Created: Fri May 24 16:18:20 1996 Page 6 of 7 Length: 51147 bytes cueved: Fri M;y 26 17:25:02 1996 84 1.99E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCUR?

8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 1 DUE To UNSCHEDUL MAINTENANCE 2.70E-03 EC1B5001TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119Go 85 1.99E 14

.00 INITIAT!NG EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC1BS012TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 86 1.99E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 87 1.99E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE

2. 70E-03 EC2BS002TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 88 1.99E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT DCCURS 8.94E-05 IEV CMTLB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX B7-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCC 2.70E-03 EC2BS022TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO 89 1.99E 14 *

.00 INITIATING EVENT CMT LINE ' BREAK EVENT OCCURS 8.94E 05 IEV CMTLB COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119G0 90 1.97E-14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB

' HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO RELAY FAILS TO OPERATE

8. 76E-04 IWDRS120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 91 1.97E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV CMTLB HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO DPEN 1.20E-02 IRWM0003 RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 92 1.93E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119G0 RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA 93 1.93E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119Go 8.76E-04 IWDR$120AFA RELAY FAILS TO OPERATE 94 1.93E 14

.00 INITIATING EVENT CMT LINE BREAK EVENT DCCURS 8.94E-05 IEV-CMTLB HARDWARE FAILURE CAUSE RECIRC. CV 1199 FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBMOD1 8.76E-04 IWDR$120AFA RELAY FAILS TO OPERATE 95 1.93E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB 8.76E-04 IWCRS120BF A RELAY FAILS TO OPERATE COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMBM001 HARDWARE FAILUPE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 96 1.88E-14

.00 INITIATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 (EV-CMTLS HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 1RWM0003 HARDWARE FAILURE OF 1RWST SQUIB VALVE 1208 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 97 1.88E-14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLB SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG HARDWARE FAILURC CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO MOV 117A UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REAMOV117TM 98 1.88E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV-CMTLB NOV 1178 UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REBMOV117TM HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN

1. 75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG 99 1.85E-14

.00 INITI ATING EVENT CMT LINE BREAK EVENT OCCURS 8.94E-05 IEV-CMTLB

1

)

Files 2 LCM 1 03. DES Crested: Fri May 24 16:18:20 1996 Page 7 of 7 Length: 51147 bytes Queued: Fri May 24 17:25:02 1996 I

COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWMOD10 HARDWARE FAILURE OF IRWST SQUIS VALVE 120e 1.46E-03

!RWM0012

100 1.85E 14

.00 INITIATING EVENT - CMT LINE BREAK EVENT OCCURS 8.94E 05 IEV CMTLS HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 JRWMOD12 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM8030 HARDWARE FAILURE OF IRWST SQUlO VALVE 120A 1.46E-03 IRWM0010 1

i 1

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1 Fitz: 2LLLO-02. DES Crscted: Fri Cry 24 16:18:30 1996 Page 1 af 8 Length: 69231 bytes Queued: Fri May 2S 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Titto: AP600 7 Fl10: 2LLLO 02.WLK ( File created by linking Lloca.in WLINK2 ** Ver. 4.02 **)

j Reduced Sum of Cutsets: 2.2580E 09 NUMBER CUTSET PROS PERCuNT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

1.37E 09 60.67 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 2

6.30E 10 27.90 IN!TI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE CDPMON CAUSE FAILURE OF RECIRC LINES DUE To SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 3

2.51E-10 11.12 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE

UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE COMMON CAUSE FAILURE OF TANK LEVEL TRAN5MITTERS (IRWST, BAT) 4.7BE-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN MAN 04 4

3.02E-12

.13 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG 5

9.64E*13

.04 INITIATING EVENT LARGE LOCA EVEN1 OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE 04 IWX XMTR COMMON CAUSE FAILURE OF CONTAINMENT SUMP LEVEL TRANSMITTERS 3.84E-05 CCX-VS FA 6

2.76E-13

.01 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE

UPPER END OF BREAK $1ZE 5.00E 01 BS!ZE LARGE COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E 05 CCX-PMXMOD4-Sb 7

2.65E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E-02 IRWM0003 8

2.65E-13

.01 IN!!!ATING EVENT LARGE LOCA EVENT DCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE

'5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FA! LURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWMOD01 9

2.21E 13

.01 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $!ZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG HARDWARE FAILURE OF IRWST $0UlB VALVE 120B 1.46E 03 IRWM0012 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 10 2 21E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 s

11 1.32E 13

.01 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG RELAT FAILS TO OPERATE 8.76E 04 IWCRS120BFA HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E-02 IRWMOD03 12 1.32E 13

.01 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE

UPPER END OF BREAK SIZE 5.00E-01 BS!ZE LARGE SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAT FAILS TO OPERATE 8.76E-04 IWDR$120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 13 4.54E 14

.00 INITIATING EVENT

LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E-02 IRWMOD03 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDS1TM

j File: 2LLLo 02. DES Crs:ted: Fri May 24 16:18:30 1996 F:ge 2 ef 8 Length: 69231 bytes Queued: Fri May 25 17:25:02 1996 14 4.54E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDC8SDD1TM 15 4.54E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO DPEN 1.20E 02 IRWM0001 BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDS1TM 16 4.54E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 BUS IDSD DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDD1TM 17 3.22E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E*01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1.46E-03 IRWM0011 18 3.22E 14

.00 INITIATING EVENT + LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE

UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE OF IRWST SQUI8 VALVE 118A 1.46E-03 IRWM0009 19 2.69E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE OF IRWST $0018 VALVE 1208 1.46E-03 IRWM0012 4

HARDWARE FAILURE OF IRWST SQUIB VALVE 1188 1.46E 03 IRWM0011 20 2.69E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG 1

y l

HARDWARE FAILURE OF IRWST SQUlB VALVE 118A' 1.46E-03 1RWM0009 21 2.51E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, B'AT) 4.78E 04 IWX-XMTR 1

FAILURE OF PMS, PLS AND DAS INDICATION FOR OPERATOR ACTIONS 1.00E-06 ALL IND-FAIL 22 2.32E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAIL 5 TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO DPEN 1.20E 02 1RWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 6

23 2.27E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 24 2.27E-14

.00 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO DPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 25 1.93E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E-03 IRWMOD12 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 1RWM0003 26 1.93E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK $1ZE 5.00E-01 SSIZE-LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO

Film: 2LLLO 02. DES Crs:ted: Fri M:y 24 16:18:30 1996 Page 3 of 8 Length: 69231 bytes Queued: Fri May 24 17:25:02 1996 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E 02 IRWM0003 27 1.93E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA-PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO DPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E-04 IWARS118BFA 28 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWBR$118AFA 29 1.89E*14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE OF 1RWST SQUlB VALVE 120B 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 30 1.89E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWMOD10 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 31 1.89E-14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARf FAILURE OF IRWST SQUlB VALVE 120B 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMAM001 32 1.89E-14

,00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWMOD10 HARDWARE FAILURE CAUSE REclRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX-PMAM001 33 1.61E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWM0012 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 1RWMOD01 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 34 1.61E 14

.00 INITIAt!NG EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1.46E 03*

IRWMOD11 35 1.61E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA-PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E 03 IRWM0012 RELAY FAILS TO OPERATE 8.76E-04 IWARS11EBFA 36 1.61E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA HARDWARE FAILURE OF IRWST SQUlB VALVE 118A 1.46E-03 IRWM0009 37 1.61E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWMOD10 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWBRS11BAFA 38 1.58E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA l

LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 1204 1.46E 03 1RWM0010 HARDWARE FAILURE OF 1RWST SQUlB VALVE 1208 1.46E-03 1RWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 39 1.58E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E-01 BSIZE LARGE

File: 2LLLO 02. DES Created: Fri M y 24 16:18:30 1996 Page 4 sf 8 Length: 69231 bytes Queued: Fri May 24 17:25:02 1996 HARDWARE FAILURE OF IRWST SOU!B VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF IRWST SQU!B VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 40 1.56E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE a UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMB030 41 1.56E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE a UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO DPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 42 1.30E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BS!ZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 RFACV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 43

,1.30E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWMOD10 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCv119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMB030 44 1.30E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 1RWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 45 1.30E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK S!ZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE 05 IAUST SQUIB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO DPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 46 1.17E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 USIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119Go COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM 3

47 1.17E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN

1. 75 E-03 REBCV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM 48 1.17E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO DPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF CLASS 1E F tTTERIES 4.70E-05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULEs MAINTENANCE 2.70E-03 EC2BS221TM 49 1.17E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BS!ZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 50 1.17E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE

UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV11900 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC185012TM 51 1.17E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $1ZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 52 1.16E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE

File 2LLLO 02. DES Crected: Fri M:y 24 16:18:30 1996 P pe 5 of 8 Length: 69231 bytes Queued: Fri May 26 17:25:02 1996 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119CO RELAY FAILS TO OPERATE-8.76E 04 IWCRS120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 1RWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 1RWM0003 53 1.16E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLO"A BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILULE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS Tf, OPERATE 8.76E-04 IWDRS120AFA HARDWARE FAILJRE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 HARDWARE FAILORE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 1RWM0001 56 1.13E-14

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 55 1.13E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BS!ZE*LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 56 1.13E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO RELAY FAILS TO OPERATE 8.76E-04

!WCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMAM001 57 1.13E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 58 1.10E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $12E - UPPER END OF BREAK SIZE

.5.00E 01 BSIZE-LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E-03 REBCV119GO MOV 11TB UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REBMOV117TM 59 1.10E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG MOV 117A UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REAMOV117TM 60 1.08E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQU1B VALVE 120A 1.46E 03 1RWMOD10 HARDWARE FAILURE OF 1RWST SQUlB VALVE 1208 1.46E 03 IRWM0012 4

COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMB030 61 1.08E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE HARDWARE FAILURE OF 1RWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SOUlB VALVE 1208 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 J

62 9.73E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF 1RWST SQUIB VALVE 120B 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2B5002TM 63 9.73E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURC OF 1RWST SQUIB VALVE 1208 1.46E-03 IRWM0012 COMMON CAUSE FALLS *E OF ?. ASS 1E BATTERIES 4.70E-05 CCX-BY-PN BUS UNAVAILABLE DUE TC UdSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM 64 9.73E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF 1RWST SQUlB VALVE 1208 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM

File: 2LLLO 02. DES Created: Fri M:y 24 16:18:30 1996 Page 6 of 8 Length: 69231 bytes Queued: Fri M:y 24 17:25:02 1996 65 9.73E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQU!B VALVE 120A 1.46E 03 IRWM0010 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM 66 9.73E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE

UPPER END OF BREAK $1ZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 COMMON CAUSE FAILURE Of CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 67 9.73E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MA!NTENANCE 2.70E-03

'EC1BS121TM 68 9.67E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG RELAY FAILS TO CPERATE 8.76E 04 IWCRS120BFA RELAY FAILS TO OPERATE 8.76E 04 IWARS118BFA 69

9,67E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS To OPERATE 8.76E 04 IWDRS120AFA RELAY FAILS To OPERATE 8.76E-04 IWBR$118AFA 70 9.67E 15

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 1RWM0010 RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 HARDWARE FAILURE CAL iES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 1RWM0003 71 9.67E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E 03 IRWM0012 RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA HARDWARE FAILURE CAUSES REclRC MOV 117A FAILS TO OPEN 1.20E-02 IRWMOD01 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 72 9.47E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC !/Os 1.41E 04 CCX-PMBM001 73 9.47E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQu!B VALVE 1208 1.46E-03 IRWM0012 RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/0s 1.41E-04 CCX PMBMOD1 74 9.4TE 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWMOD10 RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 75 9.4TE-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF 1RWST SQUIB VALVE 120B 1.46E-03 IRWM0012 RELAY FAILS TO DPERATE 8.76E 04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC t/Os 1.41E 04 CCX-PMAMOD1 76 9.20E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E-03 IRWM0012 MOV 117B UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REBMov117TM 77 9.20E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E*04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG

File: 2LLLO 02. DES Crs:ted: Fri MCy 24 16:18:30 1996 i

Page 7 of 8 Length: 69231 bytes Queued:- Fri May 24 17:25:02 1996 MOV 117A UNAVAll DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REAMOV117TM 78 7.80E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119Go i

RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF DUTPUT LOGIC GROUPS 9.69E 05 CCA-PM8030 l

79 7.80E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 80 7.80E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA e

LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDUARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO RELAf FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 01 7.80E 15

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 82 6.61E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA 4

LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E 01 BS!ZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM 83 6.61E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 4

HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO BUS IDSA DD-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDABSDD1TM B4 6.61E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG

1. 75E-03 REBCV119GO

~

HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN BUS IDSA DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDABSDK1TM 85 6.61E 15 00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG BUS IDSB DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDS1TM B6 6.61E-15

.00 INITIATING EVENT. LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK $!ZE 5.00E-01 BSIZE-LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG BUS IDSB DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04

!DBBSDD1TM 87 6.61E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119G0 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG BUS IDSB DK-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDK1TM 88 6.51E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE-5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 89 6.51E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQU!B VALVE 1208 1.46E 03 1RWMOD12 RELAY FAILS TO DPERATE 8.76E-04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCx PMB030 90 6.51E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE - UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWMOD10 RELAY FAILS TO DPERATE 8.76E 04 IWCRS120BFA

Fils: 2LLLD 02. DES Created: Fri May 24 16:18:30 1996 Page 8 of 8 Length: 69231 bytes Queued: Fri May 24 17:25:02 1996 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMA030 91 6.51E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $12E UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE HARDWARE FAILURE OF IRWST $0UlB VALVE 120s 1.46E 03 IRWM0012 RELAY FA!LS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 92 5.84E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE LARGE RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM 93 5.84E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK $1ZE 5.00E-01 BSIZE-LARGE RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA I

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DOE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM 94 5.84E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM 95 5.84E 15

.00 INIT!ATING EVENT s LARGE LOCA EVENT OCCURS 1.05E 04

!EV LLOCA LLOCA BREAK $1ZE UPPER END OF BREAK SIZE 5.00E-01 BSIZE LARGE RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 96 5.84E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLDCA BREAK $12E UPPER END OF BREAK $1ZE 5.00E 01 BSIZE LARGE 3

i RELAY FAILS TO OPERATE 8.76E-04 IWDR$120AFA COMMON CAUSE FAILURE OF CLASS 1C BATTERIES 4.70E 05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 97 5.84E 15

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.0$J 04 IEV LLOCA

~

LLOCA BR'AK SIZE

UPPER END OF BREAK SIZE 5.00E L1 BSIZE LARGE RELAY FAILS TO OPERATE 8.76E 0/

IWDR$120AFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E C4 CCX-BY PN 3

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.7GE-03 EC1BS121TM 98 5.80E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE

UPPER END OF BREAK $1ZE 5.00E-01 BSIZE LARGE RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 1

HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWMOD03 99 5.68E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BSIZE-LARGE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 100 5.68E-15

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE - UPPER END OF BREAK SIZE 5.00E 01 BS!ZE-LARGE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001

Files 2LLLO 05.0ES Cre:ted: Fri May 24 11:18:12 1996 Page 1 of 8 Length: 69231 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Tittas AP600 7 Files 2LLLO 05.WLK ( File created by linking Lloca.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 2.2580E 09 NUMBER CUTSET PROB PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

1.37E 09 60.67 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04

[EV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 2

6.30E 10 27.90 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CAUSE FAILURE OF RECiRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 3

2.51E 10 11.12 INITIATINP EVEN) - LASGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREM SIZE -iUWER END OF BREAK SIZE 5.00E-01 BSIZE COMMON CALSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 4

.3.02E 12

.13 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG 5

9.64E 13

.04 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR COMMON CAUSE FAILURE OF CONTAINMENT SUMP LEVEL TRANSMITTERS 3.84E-05 CCX VS-FA 6

2.76E 13

.01 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA i

LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE i

COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E-05 CCX PMXM004-St 7

2.65E-13

.01 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA j

LLOCA BREAK $12E LOWER END OF BREAK SIZE.

5.00E-01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO i

HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWMcD03 j

8 2.65E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE f

HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119G0 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG j

HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 9

2.21E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SJZE 5.00E-01 BS!ZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E-03 1RWMOD12 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 10 2.21E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.0VE 01 BS!ZE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWMOD10 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 11 1.32E 13

.01 INIT!ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA* PLUG RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 1RWM0003 12 1.32E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 13 4.54E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM

Files 2LLLO 05. DES Crseted: Fri M;y 24 16:18:12 1996 Page 2 of 8 Length: 69231 bytes Queued: Fri May 24 17:25:02 1996 14 4.54E 14

.00 (NITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDD1TM 15 4.54E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSES RECIRC Mov 117A FAILS TO OPEN 1.20E-02 IRWM0001 BUS IDSD DS-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM 16 4.54E 14

.C0 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 OUS 1050 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDOSDD1TM 17 3.22E 14

.00 INITIAT!NG EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 85!ZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 RESCV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1.46E 03 IRWM0011 18 3.22E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 118A 1.46E 03 IRWM0009 19 2.69E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $12E LOWER END OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWNOD12 HARDWARE FAILURE OF !RWST SQU!B VALVE 1188 1.46E 03 IRWM0011 20 2.69E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOYER END OF BREAK S!ZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03

!RWMOD10 SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 11BA 1.46E-03 1RWM0009 21 2.51E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSI2E COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR FAILURE OF PMS, PLS AND DAS INDICATION FOR OPERATOR ACT10NS 1.00E-06 ALL-IND FAIL 22 2.32E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO DPEN

1. 75E-03 REBCv119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 23 2.27E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE.CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 24 2.27E 14

.00 INITIATlWG EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO DPEN

1. 75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO DPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC !/Os 1.41E 04 CCX PMAMOD1 25 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWEP END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAU*E RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARE FAILURE OF IRWST SCUlB VALVE 1208 1.46E 03 IRWM0012 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 HARDWARE FAILURE CAUSES RfCIRC MOV 117B FAILS TO DPEN 1.20E 02 IRWM0003 26 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO DPEN 1.75E 03 REBCV119GO

l File: 2LLLO 05. DES Ceseted: Fri M;y 24 16:18:42 1996 l

Page 3 of 8 Length: 69131 bytes Queued: Fri M:y 26 17:25:02 1996 HARDWARE FAILURE CAUSES REclRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWM0003 27 1.93E 14

.00 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BS!ZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 'i98 FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWAR$118BFA I

28 1.93E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA i

LLOCA BREAK $12E LOWER END OF BREAK SIZE 5.00E 01 BSIZE j

HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWBRS118AFA 29 1.89E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01

'BS!ZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMBM001 30 1.89E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWMOD10 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMSM001 31 1.89E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK $1ZE 5.00E 01 BS!ZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE OF IRWST SQUIB VALVE 120B 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 32 1.89E-14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SOUlB VALVE 120A 1.46E-03 1RWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAMOD1 33 1.61E-14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF 1RWST $0UlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E 03 IRWM0012 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 J4 1.61E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA HARDWARE FAILURE OF IRWST SQUIB VALVE 1188 1.46E 03 IRWM0011 35 1.61E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E 03 IRWM0012 RELAY FAILS TO OPERATE 8.76E 04 IWAR$118BFA 36 1.61E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E-01 83!ZE SUMP SCREEN B PLUGS AND PREVFWTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO UPERATE 8.76E- 04 IWDRS120AFA HARDWARE 'AILURE OF IRWST SOUlB VALVE 118A 1.46E-03 1RWMOD09 37 1.61E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE

LOWER END OF BREAK $1ZE 5.00E 01 BS!ZE HARDWARE FAILURE OF IRWST $0UlB VALVE 120A 1.46E 03 1RWM0010 SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG RELAY FAILS TO OPERATE 8.76E-04 IWBRS118AFA 38 1.5BE-14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $12E 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST $001B VALVE 120A 1.46E 03 IRWMOD10 HARDWARE FAILURE OF 1RWST SQUIB VALVE 120B 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 39 1.5BE 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $12E 5.00E 01 BS!ZE

Flte: 2LLLO 05. DES Cre ted: Fri M:y 24 16:18:42 1996 Page 4 of 8 Length: 69231 bytes Queued: Fri M;y 26 17:25:02 1996 HARDWARE FAILURE OF 1RWST SOU!B VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF 1RWST $0UlB VALVE 1208 1.46E 03 1RWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAMOD1 40 1.56E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119CO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PMB030 41 1.56E 14

.00 INITIAFING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 119B FA!LS TO OPEN~

1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMA030 42 1.30E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BS!ZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SOU!B VALVE 120B 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 43 1.30E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST $0018 VALVE 120A 1.46E-03 IRWHOD10 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAPEE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM8030 44 1.30E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119G0 HARDWARE FAILURE OF IRWST SOUlB VALVE 120B 1.46E-03 1RWMOD12 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PHA030 45 1.30E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PMA030 1.05E-04 IEV LLOCA 46 1.17E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS '

5.00E 01 BSIZE LLOCA BREAK SIZE -LOWER END OF BREAK SIZE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENAN,CE 2.70E 03 EC2BS002TM 47 1.17E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $12E -LOWER END OF BREAK SIZE 5.00E-01 BSIZE j

HARDWARE FAILURE CAUSE REclRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV11930 i

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM 48 1.17E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $!ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM 49 1.17E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 LEV LLOCA LLOCA BnCAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119Go COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 50 1.17E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 51 1.17E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM 52 1.16E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $12E LOWER END OF BREAK SIZE 5.00E-01 BSIZE

Flie 2LLLO 05. DES Cricted: Fri May 24 16:18:42 1996 Page 5 cf 8 Length: 69231 bytes Queued: Fri May 25 17:25:02 1996 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO RELAY FAILS TO OFERATE 8.76E-04 IWCRS120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWMOD01 HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO DPEN 1.20E-02 IRWM0003 53 1.16E 14

.00 INITI ATING EVENT LARGE LOCA EVENT DCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119Go RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWM0003 4

54 1.13E-14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 53 1.13E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 56

1.13E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE HARDWARE FAILURE CAUSE RECILO. CV 119A FAILS TO OPEN 1.75E 03 REACV119Go RELAY FAILS TO OPERATE 8.76E- 04 IWCRS120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMAM001 57 1.13E-14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC l/Os 1.41E 04 CCX-PMAMOD1 58 1.10E 14

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO MOV 1178 UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REBMOV11TTM 59 1.10E 14

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG MOV 117A UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REAMOV117TM 60 1.08E 14

.CV INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWMOD10 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWMOD12 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMB030 61 1.08E 14

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF 1RWST SQUlB VALVE 1208 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 62 9.73E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E- 04 IEV-LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE To UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM 63 9.73E 15

.00 INIT!ATING EVENT - LARGE LOCA EVENT OCCURS 1.052-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E-03 1RWM0012 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70C-05 CCX-BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM 64 9.73E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120B 1.46E-03 IRWM0012 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE To UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM

5 File: 2LLLO 05. DES Created: Fri May 24 16:18:42 1996 Page 6 of 8 Length: 69231 bytts Queued: Fri M;y 24 17:25:02 1996 65 9.73E 15

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 BS!ZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN j

UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM 66 9.73E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRW90010 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM 67 9.73E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF 8 REAR $1ZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST $0UlB VALVE 120A 1.46E 03 IRWM0010 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN BUS UNAVAILABLE DUE TO UhZCHEDULED MAINTENANCE 2.70E 03 ECIBS121TM 68 9 47E 15

.00 INITIATING EVENT LARGE LOCA MVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E-01 8 SIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA RELAY FAILS TO OPERATE 8.76E 04 IWAR$11BBFA 69 9.67E 15

.00 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV*LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA RELAY FAILS TO OPERATE 8.76E 04 IWBR$118AFA 70 9.67E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 71 9.67E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE 1

HARDWARE FAILURE OF IRWST SQU!B VALVE 120B 1.46E-03 IRWM0012 RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02

[RWMOD03 72 9.47E-15

.00 INITIATING EVENT

LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWMOD10 1

RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 s.

73 9.4TE 15

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA j

LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF 1RWST SOU!B VALVE 120B 1.46E 03 IRWMOD12 RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E-04 CCX PMBM001 74 9.4TE 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA 1

LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA 1

COMMON CAUSE FAILURE OF DUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 l

J 75 9.47E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $12E -LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 1RWM0012 i

RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAMOD1 76 9.20E-15

.00 INITI ATING EVENT

LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER FWD OF BREAK SIZE 5.00E-01 BSIZE SUMP SCREEN A PLUCL AND PREVENTS FLOW 2.40E-04 REA-PLUG HARDWARE FAILUKE OF 1RWST SQUlB VALVE 1208 1.46E-03 IRWM0012 MOV 117B UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REBMOV11TTM 77 9.20E 15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB-PLUG

File: 2LLLO 05. DES Crc:ted: Fri M:y 24 16:18:42 1996 Psee 7 of 8 Length: 69231 bytes Queued: Fri M:y 24 17:25:02 1996 MOV 117A UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REAMOV1177M 78 7.80E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA i-LLDCA BREAK $1ZE LOWED END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT logic GROUPS 9.69E 05 CCx PMB030 79 7.80E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119Go RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PMB030 80 7.80E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO i

RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX FMA030 81 7.80E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.0$E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO DPERATE 8.76E 04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCx PMA030 82 ' 6.61E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK $12E LOWER END OF BREAK SIZE 5.00E 01 BSIZE i

SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDSITM 83 6.61E-15

.00 INITIATihG EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK $1ZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO BUS IDSA 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04

! DABS 001TM 84 6.61E 15

.00 INITIATING EVENT LARGE LOCA EVENT DCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BS!ZE i

SUMP ECREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO BUS IDSA DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDABSDK1TM 85 6.61E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 2.40E-04 REB PLUG SUMP SCREEN B PLUGS AND PREVENTS FLOW 3.00E-04 IDB8S0$1TM BUS 1DS8-D$ 1 UNAVAILABLE DDE TO TEST OR CORRECTIVE MAINTENANCE 4

l 4

i 86 6.61E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 -

!EV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG BUS 10SB 00-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDBBSDD1TM 87 6.61E 15

.00 INIT!ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04

[EV LLOCA l

LLOCA BREAK SIZE LOWER END OF BREAK $1ZE 5.00E 01 BSIZE HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG BUS IDSB DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDBBSDK1TM 88 6.51E 15

.00 INITIATING EVENT - LARGE LOCA EVENT DCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWMOD10 RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCx-PMB030 89 6.51E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWMOD12 RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCx PMB030 90 6.51E 15-

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 LEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE 1

HARDWARE FAILURE OF IRWST SOUlB VALVE 120A 1.46E-03 IRWMOD10 RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA

Fila: 2LLLO 05.0ES Created: Fri May 24 16:18:42 1996 Page 8 of 8 Length: 69231 byt s cueued: Fri M1y 24 17:25:02 1996 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMA030 91 6.51E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE HARDWARE FAILURE OF IRWST $0UlB VALVE 1208 1.46E-03 IRWM0012 RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF OUTPUT LOGIC CROUPS 9.69E 05 CCX-PMA030 92 5.54E 15

.00 INITIATING EVENT - LADGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK $1ZE 5.00E 01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN f

UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC28$002TM 93 5.84E 15

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E-01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN J

BUS UNAVAILABLE DUE TO UNSCHEDULED KAINTENANCE 2.70E 03 EC2BS022TM 94 5.84E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E*01 BSIZE RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA COMMON CAUSE FAILURE 08 CLASS 1E BATTERIES 4.70E 05 CCX BY PN

)

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM 95 5.84E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK $!ZE 5.00E-01 BSIZE RELAY FAILS TO OPERATE 8.76E-04 IWDR$120AFA l

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PW UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM j

96 5.84E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM 97 5.84E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK $1ZE -LOWER END OF BREAK SIZE 5.00E 01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM i

98 5.80E 15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA LLOCA BREAK SIZE -LOWER END OF BREAK SIZE 5.00E-01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 1RWM0003 99 5.68E-15

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 100 5.68E-15

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV LLOCA LLOCA BREAK SIZE LOWER END OF BREAK SIZE 5.00E 01 BSIZE RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 l

l 1

l

Filer 2LLOS 06. DES Cmted: Fri May 25 16:21:04 1996 Page 1 sf 9 Length: 79927 bytes Queued: Fri May 25 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1

Title:

AP600 7 Fils: 2LLOS 06.WLK ( WLINK2 02

WARNING

MAX CUTSET LIMIT REACHED, PROBABILITT INCREASED)

Reduced Sun of Cutsets: 3.1550E 11 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

9.64E 12 30.55 INITIATING EVENT - LOS$ OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LO$P FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDIT DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA COMMON CAUSE FAILURE OF 4 SQUls VALVES Ik dECIRC LINES 2.60E 05 IWX EV4-SA 2

4.24E 12 13.44 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP j

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 Z02M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 3

'2.96E 12 9.38 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTM R05 j

SFW MOV V028 FAILS TO CPEN 1.41E 02 FW00028 i

COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA h.77E12 5.61 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP J

4 FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANOBY leg UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA C0 pet 0N CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 5

1.71E 12 5.42 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFF3!TE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 l

OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG-MAN 00 OPERATOR FAILS TO LOCALLT REFILL SW BASIN 4.00E-02 SWN MANO3 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA COMMON CAUSE FAILURE OF 4 $0UlB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4 SA 6

8.81E 13 2.79 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 GTH ROS BREAKER 200 FAILS TO OPEN (#3,5) 4.20E 03 EC2CB200VO COMMON CAUSE FAILURE OF PRNR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQU1B VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 7

7.79E 13 2.47 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS To START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 ZO2M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS 70 ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 8

5.66E 13 1.79 INIT!ATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP I

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS BATTERT 091 UNAVAILABLE 2.70E-03 ED2M0003 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 9

5.66E*13 1.79 INITIATING EVENT LOS$ OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 UNAVAILABILITT OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA' 10 5.66E 13 1.79 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS021TM i

COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 11 5.66E 13 1.79 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS211TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX*AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA i

l File: 2LLOS-06. DES Cr ated: Fri M y 24 16:21:04 1996 Page 2 of 9 L eryth: 79927 bytes cueved: Fri M2y 24 17:23:02 1996 l

12 5.43E 13 1.72 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH RO5 SFW MOV V028 FAILS TO OPEN 1.41E 02 FWM00028 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, 8AT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 13 3.18E 13 1.01 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CARINET SUPPLY) 3.05E 04 E03 MOD 07 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REclRC LINES 2.60E 05 IWX EV4 SA 14 3.15E 13 1.00 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER Loss OF AIR 2.04E 01 REG MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E 02

-SWN-MAN 03 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (!RWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 15 2.62E 13

.83 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 LOSS OF DG ROOM VENTILATION FANS 1.25E 03 ZO2M0004 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 4

16 2.41E 13

.76 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 M!NUTES 7.00E 01 OTH-R05 STAN0BY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO2DG002TM PLUG / LEAK OF PRHR HEAT EXCHANGER 2.40E 06 PCNHR001ML COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA t

17 2.41E-13

.76 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM FAILURE OF P RHR DUE TO IRWS TANK FAILURE 2.40E 06 IWNTK001AF COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 18 2.24E 13

.71 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 OPERATOR FAILS To LOCALLY REGULATE FLOW TO SG AFTER LOS$ OF AIR 2.04E-01 REG MAN 00 FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011RI COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 19 1.64E 13

.52 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS SFW PUMP MP 038 FAILS TO START AND RUN 1.70E-02 FWM00038 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO10G001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA I

COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REClRC LINES 2.60E 05 IWX EV4 SA 20 1.62E-13

.51 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 BREAKER 200 FAILS TO OPEN !#3,5) 4.20E-03 EC2CB200VO COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 21 1.51E 13 48 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBT DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM i

COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 22 1.36E 13 43 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 SFW MOV V0138 FAILS TO OPEN 1.41E-02 FWMOD0138 STANDBT DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo10G001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4-SA 23 1.22E 13

.39 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E 04 CCX-TT-UF

Ffits2LLOS06. DES Created: Fri May 25 16:21:04 1996 Page 4 of 9 LonSth 79927 bytes Queued: Fr{ May 25 17:25:02 1996 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUA1E CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E 02 REN MAN 04 36 1.04E 13

.33 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS BUS UNAVAILABLE DUE To UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS211TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR

. OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN-MAN 04 37 1.00E 13

.32 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMFNT 4.78E-04 CCX TRNSM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 38 1.00E 13

.32 INITIATING EVENT - Lo$$ OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 l

l COMMON CAUSE FAILURE OF SENSORS IN HIGH PRES $URE ENVIRONMENT 4.78E 04 CCX XMTR

{

COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SOUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 39 9.44E-14

.30 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER CFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS i

OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00 j

PUMP SUBLOOP B HARDWARE FAILURE OR MAINTENANCE OR DIVERTED FLOW 4.80E-02 CCBM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 201DG001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA l

40 7.48E 14

.24 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 LEV LOSP

~l FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 OPER M FAILS.To LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00 PUMP %8 LOOP B IN MAIP *ENANCE (#1) 3.80E-02 SWB-001TM STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO1DG001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA J

COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 41 7.39E 14

.23 !NITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 SFW MOV V028 FAILS TO OPEN 1.41E 02 FWM00028 PLUG / LEAK OF PRHR HEAT EXCHANGER 2.40E 06 PCNMR001ML COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN REC!RC LINES 2.60E 05 IWX EV4-SA 42 7.39E-14

.23 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS 3

SFW MOV V028 FAILS TO OPEN 1.41E-02 FWMOD028 FAILURE OF P RNR DUE TO IRWS TANK FAILURE 2.40E 06 IWNTK001AF COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 43 7.20E 14

.23 INIT!ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FA! LURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 SFW PUMP MP 038 FAILS TO START AND RUN 1.70E-02 FWMOD03B I

DG FAILS TO START & RUN OR BKR 102 FAILS TO CLOSE 2.02E 02 201M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 44 6.65E-14

.21 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LUSP 4

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 l

125 VDC PMEL EDS2 DS 11 COMPONENT FAILURES 3.17E-04 ED2M0011 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA 1

COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 45 6.65E 14

.21 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 202 MOD 01 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 46 6.29E 14

.20 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP j

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 a

BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM COBO40N CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 $0V!B VALVES IN REC!RC LINES 2.60E-05 IWX-EV4-SA 47 6.29E 14

.20 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE To RFCOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS

File: 2LLOS 06. DES Cr:cted: Fri Cry 24 16:21:04 1996 Page 3 of 9 L ength: 79927 bytes Queued: Fri May 26 17:25:02 1996 COMMON CAUSE FAILURE OF 4 $0UlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA

~

24 1.21E 13

.38 IN!T!ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE 70 RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT

4. 78E-04 CCX-XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4-SA 25 1.19E 13

.38 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4,60E-02 ZO2DG002TM P*RHR FAILURE OF AIR OPERATED VALVE V108A (NO MOVEMENT) 1.09E-03 PRAAV108LA P RHR FAILURES OF AIR OPERATED VALVE V1088 (NO h0VEMENT) 1.09E 03 PRBAV108LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REclRC LINES 2.60E 05 IWX EV4-SA 26 1.15E-13

.36 INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW To SG AFTER LOSS OF AIR 2.04E-01 REG-MAN 00 BATTERY DB1 UNAVAILABLE 2.70E 03 ED1M0003 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 27 1.15E 13

.36 IN!TI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS COMMON CAUSE FAILURE OF SFW MOVs V028, V013A, V013B TO OPEN 5.50E 04 FWX MV2 Go COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SOU!B VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 28 1.15E 13

.36 INITTATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE' TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS COMMON CAUSE FAILURE OF Movs SG V067A & V0678 TO OPEN 5.50E 04 SGX MV-GO COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF 4 SQu!B VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 29 1.13E-13

.36 INIT!ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS COMMON CAUSE FAILURE OF SFW PUMPS TO START 5.40E-04 FWX PM2-FS COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 30 1.06E 13

.34 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202M0001 PLUG / LEAK OF PRHR HEAT EXCHANGER 2.40E 06 PCNHR001ML COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4 SA 31 1.06E 13

.34 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 LEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 ZO2M0001 FAILURE OF P-RHR DUE TO IRwS TANK FAILURE 2.40E 06' IWNTK001AF COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA i

32 1.04E 13

.33 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 33 1.04E 13

.33 INITI ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS i

BATTERY DB1 UNAVAILABLE 2.10E 03 ED2Mn003 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, SAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 36 1.04E-13

.33 INITIATING EVENT LOSS OF OFFSITE POWEP EVENT OCCURS 1.20E 01 IEV-LOSP i

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 35 1.04E 13

.33 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS021TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV-LA

File: 2LLOS 06. DES Crested: Fri May 24 16:21:04 1996 Pa9e 5 of 9 Length: 79927 bytes Queued: Fri May 24 17:25:02 1996 i

BUS 10$D 00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDDITM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 00UIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 48 6.29E 14

.20 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTN ROS BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDK1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV-LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 49 6.29E 14

.20 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCUPS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 i

BUS EDS2 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E 04 E02BSDS1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV-LA a

COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4 SA 50 6.28E 14

.20 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV-LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SrREEN PLUGGING 1.20E 05 REX FL-GP 51

'6.28E-14

.20 INIT!ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E*05 PXX-AV-LA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 52 6.28E 14

.20 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF PRNR ADVs 9.60E 05 PXX AV-LA i

l HARDWARE FAILURE OF N RNR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 53 6.06E 14

.19 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 SFW PUMP MP 03A FAILS TO START AND RUN

1. 70E-02 FWM0003A SFW PUMP MP 038 FAILS TO START AND RUN 1.70E 02 FWM00038 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 54 5.97E 14

.19 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01

!EV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 SFW MOV V0138 FAILS TO OPEN 1.41E 02 FWM000138 DG FAILS TO START & RUN OR BKR 102 FAILS TO CLOSE 2.02E 02 ZO1M0001 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REClRC LINES 2.60E 05 IWX EV4 !A 55 5.85E 14

.19 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT DCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3 MUD 07 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE-04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E 02 REN-MAN 04 1

56 5.48E-14

.17 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo2DG002TM P RHR AIR OPERATED VALVE V10BA UNAVAILABLE DUE TO TEST OR MAIN.

5.00E-04 PRAAV108TM P-RHR FAILURES OF AIR OPERATED VALVE V1088 (N0 MOVEMENT) 1.09E-03 PRBAV108LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4-SA 57 5.48E 14

.17 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM P RHR FAILURE OF AIR-OPERATED VALVE V10BA (NO MOVEMENT) 1.09E-03 PRAAV108tA P RHR AIR-OPERATED VALVE V1088 UNAVAILABLE DUE TO TEST OR MAIN.

5.00E 04 PRBAV108TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05

!WX EV4 SA l

58 5.33E-14

.17 INITIATING EVENT - LOSS OF OFFS!TE POWER EVENT OCCURS 1.20E-01

!EV-LOSP l

FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05

)

OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG-MANDO BATTERY DB1 UNAVAILABLE 2.70E-03 ED1M0003 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX-AV-LA i

l COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP

Filc: 2LLOS 06. DES Crocted: Fri M;y 21 16:21:04 1996 Page 6 of 9 Length: 79927 bytso Queued: Fri M:y 2517:25:021996 59 5.30E-14 17 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS COMMON CAUSE FAILURE OF SIGNAL SELECTOR GROUPS-LOGIC &I/Os 2.53E 04 CCX-PLSM006 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX-AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 60 5.24E-14

.17 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202M0001 P RHR FAILURE OF AIR OPERATED VALVE v108A (NO MOVEMENT) 1.09E-03 PRAAV108LA P RHR FAILURES OF AIR OPERATED VALVE V1088 (NO MOVEMENT) 1.09E-03 PRBAV108LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4*SA 61 5.03E 14

.16 INITI ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS SFW MOV V013A FAILS TO OPEN 1.41E-02 FWM00013A SFW PUMP MP 038 FAILS TO START AND RUN 1.70E 02 FWM00038 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 62 5.03E-14

.16 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E*01 OTH R05 SFW PUMP MP 03A FAILS TO START AND RUN 1.70E 02 FWM0003A SFW MOV V0138 FAILS TO OPEN 1.41E 02 FWM000138 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 63 4.82E-14

.15 sNITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWC3 IN 30 MINUTES 7.00E-01 OTH ROS LOSS OF DG ROOM VENTILATION FANS 1.25E 03 ZO2M0004 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 64 4.80E-14

.15 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP i

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG-MAN 00 PUMP MP 01B SEGMENT HARDWARE FAILURE OR DIVERTED FLOW 2.44E-02 SWBM0002 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 201DG001TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX-AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 65 4.59E-14

.15 INITI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS CST CHECK VALVE V029 FAILS TO OPEN 2.19E-04 FWNCV029Go COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV-LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IF RECIRC LINES 2.60E-05 IWX EV4-SA 66 4.54E-14

.14 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00 AIR COMPRESSOR B FA!LS To START & RUN DUE TO HARDWARE FAILURES 2.31E-02 CASM0002 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO10G001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 67 4.43E 14

.14 INITIATING EVENT. LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DG002TM PLUG / LEAK OF PRHR HEAT EXCHANGER 2.40E 06 PCNHR001ML i

COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.75E-04 IWX XMTR l

OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN MAN 04 68 4.43E-14

.14 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO20G002TM FAILURE OF P RHR DUE TO IRWS TANK FAILURE 2.40E-06 IWNTK001AF COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 69 4.28E 14

.14 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E 02 SWN-MANO3 j

PLUG / LEAK OF PRHR HEAT EXCHANGER 2.40E 06 PCNHR001ML COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4 SA

l l

Files 2LLOS 06. DES Cre:ted: Fri May 24 16:21:04 1996 Page 7 of 9 Length: 79927 bytes Queued: Fri May 25 17:25:02 1996 70 4.28E 14

.14 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 LEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS OPERATOR FAILS TO LOCALLT REGULATE FLOW TO SG AFTER LOS$ OF AIR 2.04E 01 REG MAN 00 OPERATOR FAILS TO LOCALLY REFILL SW BASIN 4.00E 02 SWN MANO3 FAILURE OF P RNR DUE TO IRWS TANK FAILURE 2.40E 06 IWNTK001AF J

COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E 05

!WX EV4 SA 71

'.17E 14 13 !NITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS SFW MOV V067A FAILS TO OPEN 1.41E 02 FWM00067A SFW MOV V0678 FAILS TO OPEN 1.41E 02 FWM00067B COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 72 4.17E 14 13 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH RO5 l

SFW MOV V013A FAILS TO OPEN 1.41E 02 FWM00013A SFW MOV V013B FAILS TO OPEN 1.41E-02 FWM000138 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA

)

COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN 2ECIRC LINES 2.60E 05 IWX EV4 SA 1

73 4.15E 14

.13 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG MAN 00 PUMP SUBLOOP B HARDWARE FAILURE OR MAINTENANCE OR DIVERTED FLOW 4.80E 02 CCBM0001 DG FAILS TO START & RUN OR BKR 102 FAILS TO CLOSE 2.02E 02 201M0001 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA J

74 4.11E 14

.13 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV*LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 CTH R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG MAN 00 FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011RI COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP REclR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAh04 l

75 3.66E-14

.12 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVEP OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 P RHR FAILURE OF AIR OPERATED VALVE V108A (NO MOVEMENT) 1.09E 03 PRAAV108LA P RHR FAILURES OF AIR-OPERATED VALVE V108B (No MOVEMENT) 1.09E-03 PRBAV108LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 76 3.59E-14

.11 INITIATING EVENT - LOSS OF 0FFS!TE POWER EVENT OCCURS

'1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER !? 30 MINUTES 7.00E 01 OTH ROS FAILURE OF OUTPUT DRIVER 1.71E-04 SFBEP028SA COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA a

'77 3.28E 14

.10 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01

!EV-LOSP

]

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 i

OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E-01 REG MAN 00 PUMP SUBLOOP B IN MAINTENANCE (#1) 3.80E-02 SW8-001TM DG FAILS TO START & RUN OR BKR 102 FAILS TO CLOSE 2.02E-02 201M0001 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4 SA 78 3.05I 14

.10 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OF7 SITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 2020G002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV-LA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E-03 REBCV119GO 79 3.01E 14

.10 INITIATING EVENT LOSS OF OFFSITE POWER EVENT DCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS SFW PUMP MP 03B FAILS TO START AND RUN 1.70E-02 FWM0003B STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 201DG001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MANQ4 80 2.96E-14

.09 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PLBM001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA

File 2LLOS 06.0ES Crs:t ed: Fri May 24 16:21:04 1996 Pag) 8 of 9 Length: 79927 bytes Cueued: Fri M:y 24 17:25:02 1996 81 2.90E 14

.09 INITI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 82 2.90E 14

.09 INITI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS BUS 10S0-00 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBS001TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP 83 2.90E 14

.09 INIT!ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDKITM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 84 2.f7E 14

.09 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 OPERATOR FAILS TO LOCALLY REGULATE FLOW TO SG AFTER LOSS OF AIR 2.04E 01 REG-MAN 00 VALVE V0378 HARDWARE FAILURE 1.41E 02 SWBM0011P STANDBY DU UNAVAILABLE DUE TO TEST AND NAINTENANCE 4.60E 02 201DG001TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 85 2.76E-14

.09 (NITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-R05 DG FAILS TO' START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 202M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX-AV LA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E-02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 86 2.76E-14

.09 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH-ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202M0001 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA HARDWARE FAILURE OF N-RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 87 2.76E 14

.09 INITI ATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202M0001 COMMON CAUSE FAILURE OF PRHR ADVs 9.60E-05 PXX AV-LA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY'FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 88 2.60E 14

.08 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Zo1DG001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 89 2.60E-14

.08 INITI ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS STANDBY DG UNAVAILAoLE DUE To TEST AND MAINTENANCE 4.60E-02 201DG001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS222TM COMMON CAUSE FAILURE OF PRHR ADVs 9.60E 05 PXX AV LA COMMON CAUSE FAILURE OF 4 $0018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 90 2.55E-14

.08 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILA8LE DUE TO TEST AND MAINTENANCE 4.60E 02 Zo2DG002TM COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E 05 PXX-AV LA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN HARDWARE FAILURE OF IRWST SOUlB VALVE 1208 1.46E-03 IRWM0012 91 2.51E 14

.08 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINiENANCE 4.60E 02 ZO2DG002TM P-RHR AIR OPERATED VALVE V108A UNAVAILABLE DUE TO TEST OR MAIN.

5.00E-04 PRAAV108tM P-RHR AIR OPERATED VALVE V1088 UNAVAILABLE DUE TO TEST OR MAIN.

5.00E 04 PRBAV108TM COMMON CAUSE FAILURE OF 4 $0U18 VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 92 2.50E 14

.08 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01

!EV-LOSP FAILURE TO RECOVER OF8 SITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05

Files 2LLOS 06. DES Crated: Fri May 24 16:21:04 1996 Page 9 of 9 Length: 79927 bytes Queued: Frf M;y 2417:25:021996 SFW MOV V0138 FAILS TO OPEN 1.41E-02 FbMOD0138 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 201DG001TM Com40N CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN MAN 04 93 2.40E*14

.08 INITIATING EVENT LOS$ OF 0FFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 ZO2M0001 P RHR AIR OPERATED VALVE V108A UNAVAILABLE DUE TO TEST OR MAIN.

5.00E 04 PRAAV108TM P RNR FAILURES OF AIR-OPERATED VALVE V108B (No MOVEMENT) 1.09E 03 PRBAV108LA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 96

-2.40E 14

.08 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202 MOD 01 P RHR FAILURE OF AIR-OPERATED VALVE V108A (No MOVEMENT) 1.09E 03 PRAAV108LA P RHR AIR OPERATED VALVE V1088 UNAVAILABLE DUE TO TEST OR MAIN.

5.00E 04 PRBAV108TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 95 2.28E 14

.07 INITIATING EVENT Loss OF OFFSITE F0WER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH R05 OPERATOR FAILS To LOCALLY REGULATE FLOW TO SG AFTER Lo$$ OF AIR-2.04E 01 REG MAN 00 AIR COMPRESSOR A FAILS TO START & RUN DUE TO HARDWARE FAILURES 2.31E-02 CASMOD03 AIR COMPRESSOR B FAILS TO START & RUN DUE To HARDWARE FAILURES 2.31E 02 CASM0002 COMMON CAUSE FAILURE OF PRHR A0Vs 9.60E-05 PXX AV LA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 96 2.25E*14

.07 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWE:t IN 30 MINUTES 7.00E-01 OTH ROS COMMON CAUSE FAILURE OF SENSOR $ IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX MMTR COMMON CAUSE FAILURE OF TEMP SENSORS 1.17E-04 CCx TT UF COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN-MAN 04 97 2.23E 14

.07 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E-01 IEV-LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX xMTR i

FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN-MAN 04 98 2.20E 14

.07 INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH R05 BREAKER 200 FA'LS TO OPEN (#3,5) 4.20E 03 EC2CB200VO PLUG / LEAK OF PRHR HEAT EXCHANGER 2.40E-06 PCNHR001ML COMMON'CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 99 2.20E-14

.07 INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01-OTH R05 BREAKER 200 FAILS TO OPEN (#3,5) 4.20E-03 EC2CB200Vo FAILURE OF P-RHR DUE TO IRWS TANK FAILURE 2.40E 06 IWNTK001AF COMMON CAUSE FAILURE OF 4 SQUIB VALVES lii RECIRC LINES 2.60F 05 IWX-EV4 SA 100 2.19E 14

.07 INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO2DG002TM P-RHR FAILURE OF AIR OPERATED VALVE V108A (No MOVEMENT) 1.09E-03 PRAAV108LA P RHR FAILURES OF AIR OPERATED VALVE V1088 (No MOVEMENT) 1.09E-03 PRBAV108LA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN MAN 04 v

File: 2LMLO 03. DES Crw.ted: Fri May 24 16:17:58 1996 P:ge 1 of 7 Length: 51147 bytes Queued: Fri Cty 24 17:25t02 1996

"*** DOMINANT CUTSETS *****

Page 1

Title:

AP600 7 Files 2LMLo 03.WLK ( File created by linking mioca.in WLINK2 ** Ver. 4.02 ")

Reduced Sum of Cutsets: 5.1260E 09 NUMSER CUTSET PROS PERLENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

4.21E 09 82.13 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FA! LURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 2

7.74E 10 15.10 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E 02 REN MAN 04 3

2.74E 11

.53 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 4

2.74E 11

.53 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004

. COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 5

2.74E 11

.53 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE OF N RNR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23 MODS COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 6

9.53E 12

.19 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX KV1*GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 7

9.33E 12

.18 INIT!ATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 8

5.64E 12

.11 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA CPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E 03 RHN MAN 01 COMMON CAUSE FAILURE OF REC!RC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 1

l 4

9 5.00E 12

.10 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA I

HARDWARE FAILURE OF N RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E 02 RNAM0009 i

HARDWARE FAILURE OF N RHR VALVES ON DV! LINE B (V 015B & 0178) 5.07E-02 RNBMOD10 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP s

i 10 3.40E 12

.07 INITIATING EVENT MEDIUM.LOCA EVENT OCCURS 1.62E 04 IEV MLOCA N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75E 03 RNNCV013GO COMMON CAUSE FAILUNE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 11 2.97E 12

.06 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR COMMON CAUSE FAILURE OF CONTAINMENT SUMP LEVEL TRANSMITTERS 3.84E-05 CCX VS FA

)

12 2.25E 12

.04 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SP0 3.40E-02 RNAM0006 N-RHR PUMP 018 FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SPO 3.40E 02 RNBM0007 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL*GP 13 1.50E 12

.03 INIT!ATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA C00440N CAUSE FAILURE OF N-RHR PUMPS TO START 7.70E-04 RNX PM FS COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 14 1.19E 12

.02 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V007A/B TO OPEN 6.10E 04 RNX KV GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 15 8.52E 13

.02 INITIATING EVENT ME01UM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FA! LURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 S COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR j

i 16 8.52E 13

.02 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E 05 CCX-PMXM004-S COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR 17 8.16E 13

.02 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 l

.-..-. =.

i j

i i

Files 2LMLo 03. DES Cracted: Fri May 25 16:17:58 1996 Page 2 of 7 Length: 51147 bytes Queued: Fri May 24 17:25:02 1996 18 8.16E-13

.02 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA i

HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE CAUSE REC!RC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 19 6.81E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 20 6.81E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRbMOD03 j

HARDWARE FAILURE OF IRWST $Q018 VALVE 1208 1.46E 03 IRWM0012

$ UMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 4

21 6.68E 13

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP SAM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST,' BAT) 4.78E-04 IWX XMTR 22 553E13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E C4 IEV-MLOCA l

BUS IDSA DS-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP j

23 5.832d3

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA BUS IDSA-DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDDITM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 1

24 5.83E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA BUS IDSA DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP j

l 25 5.83E 13

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBS0$1TM

(

COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP l

26 5.83E-13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA BUS 1050 D0-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBS001TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 27 5.83E-13

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 28 4.67E 13

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04

!EV MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 29 4.09E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB-PLUG RELAT FAILS TO OPERATE 8.76E 04 IWDR$120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 30 4.09E 13

.01 INIT!ATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 RELAT FAILS TO OPERATE 8.76E-04 IWCR$120BFA SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 31 3.32E 13

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA i

FAILURE OF OUTPUT DRIVER 1.71E-04 RNBEP011SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 32 3.32E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNAEP022SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP t

33 3.32E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA FAILURE OF OUTPU.T DRIVER 1.71E-04 RNDEP023SA COMMON CAUSE FA!.URE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 34 2.74E-13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 35 2.74E 13

.01 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/0s 1.41E 04 CCX-PMDM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 4

e+

File: 2LMLO-03. DES Crs:ted: Fri M:y 24 16:17:58 1996 Page 3 of 7 Length: 51147 bytes Queued: Fri Mry 24 17:25:02 1996 36

2. 74E-13

.01 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PL4 MOD 1 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL CP 37 1.88E 13

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMA030 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 4

38 1.88E 13

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PM0033 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 39 1.88E 13

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PL403 COMMON CAUSE FAILURE OF RECIRC LINES DOE TO SUMP SCREEN PLUGG[NG 1.20E-05 REX FL GP 40 1.78E 13

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04

~IEV-MLOCA N RHR PUMP 01B FAILS /ST CK V007B/C8 FTC/RE FTC/C8 ECS221 SPO 3.40E 02 RNBM0007 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 41 1.78E 13

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA N RHR PUMP 018 FAILS /ST CK V0079/C8 FTC/RE FTC/C8 ECS221 SPO 3.40E 02 RN8 MOD 07 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

~

2.70E-03 EC185013TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PlVCGING 1.20E 05 REX-FL-GP 42 k.78E13

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA N RHR PUMP 01A FAILS /ST CK V007A/C8 FTC/RE FTC/C8 ECS122 SPO 3.40E 02 RNAMOD06 UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC28S002TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 43 1.78E-13

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA N RHR PUMP 01A FAILS /ST CK V007A/C8 FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAMOD06 i

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285023TM COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 44 1.40E 13

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA BUS 10$D-05-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDSITM SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWMOD01 1.62E-04 IEV-MLOCA 45 1.40E-13

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS BUS IDSD-DD-1 UNAVAILABLE DUE TO TEST OR CORRECT!vE MA!NTENANCE 3.00E-04 IDDBSDDITM SUMP SCREEN O PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG MACDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 v

46 1.40E-13

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA HARDWARE FAILURE CAUSES REclRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 47 1.40E-13

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA r

HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E 02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDDITM 2.40E-04 REA PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 48 9.93E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA 2.40E 04 REB PLUG SUMP SCREEN 8 PLUGS AND PREVENTS FLOW HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE OF IRWST $0U18 VALVE 118A 1.46E*03 IRWM0009 49 9.93E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1.46E-03 IRWMOD11 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 2.40E 04 REA PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 50 9.91E 14

.00 INITI ATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA COMMON CAUSE FAILURE OF N RHR CHECK VALVES V017A/B TO OPEN 5.10E 05 RNX-CV GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 51 9.68E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA 4.98E-05 CCX PMAM004 COMMON CAUSE FAILURE OF MUX LOGIC GROUPS COMMON CAUSE FAILURE OF REclRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 1.62E 04 IEV-MLOCA 52 9.68E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT DCCURS 4.98E-05 CCX PMDM004 COMMON CAUSE FAILURE OF MUX LOGIC GROUPS COMMON CAUSE FA! LURE OF REclRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP

File: 2LMLO 03. DES Crs:ted: Fri M;y 24 16:17:58 1996 Page 4 of 7 Length: 51147 bytts Queued: Fri May 24 17:25:02 1996 53 9,68E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E 05 CCX-PLMM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 54 9.29E-14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR 55 8.75E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 OPERATOR FAILS TO THROTTLE NORMAL RHR PUMP DISCHARGE VALVE V011 3.75E 03 RHN MAN 06 COMMON CAUSE FAILURE OF RECIRC LlhES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 56 8.29E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SQUIB VALVE 118A 1.46E 03 IRWM0009 57 8.29E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FA! LURE OF !RWST SOU!B VALVE 118B 1.46E 03 1RWM0011 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 58 7.74E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-D4 IEV MLOCA FAILURE OF PMS, PLS AND DAS INDICATION FOR OPERATOR ACTIONS 1.00E 06 ALL-IND-FAIL COMMON'CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-KMTR 59 7.14E-14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 1RWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO

-HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 60 7.00E-14

.00 INITIATING EVENT

MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC !/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119G0 HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN

1. 75E-03 REBCV119GO 61 7.00E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OFSN 1.75E 03 REACV119GO 62 5.9({ 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO RELAY FAILS TO OPERATE 8.76E 04 IWBR$118AFA J

63 5.96E 14

.00 INITI ATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA J

HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FA!LS TO OPEN 1.75E 03 REBCV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSES RECIPC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 j

64 5.96E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF IRWST SOU!B VALVE 1208 1.46E-03 IRWM0012 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 1

65 5.96E-14

.00 INITIATING EVENT

MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA RELAY FAILS TO OPERATE 8.76E-04 IWAR$118BFA HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG 66 5.84E 14

.00 INITI ATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQU!B VALVE 1208 1.46E 03 IRWM0012 67 5.84E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC CV 119B FAILS TO OPEN

1. 75 E-03 REBCv119GO 68 5.84E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 LEV-MLOCA HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E-04 CCX PMBM001

File 2LMLO-03. DES Cr::ted: Fri May 24 16:17:58 1996 P69e $ cf 7 LenSth: 51147 bytts Queued: Fri M2y 2417:25:021996 HARDWARE FAILURE OF IRWST SOU!B VALVE 120A 1.46E 03 1RWM0010 69 5.84E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE OF IRWST Sou!B VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO TO 4.97E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWORS120AFA HARDWARE FAILURE OF 1RWST $0UlB VALVE 118A 1.46E 03 1RWM0009 71 4.97E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 RELAY FAILS TO OPERATE 8.76E 04 IWBRS118AFA 72 4.97E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 1RWM0012 l

HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 1RWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 73 4.97E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FAILURE OF 1RWST SOUlB VALVE 1188 1.46E 03 1RWM0011 RELAY FAILS TO OPERATE 8.76E-C4 IWCRS120BFA SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG 74 4.97E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04

!EV MLOCA RELAY FAILS To OPERATE 8.76E 04

! WARS 118BFA 6

HARDWARE FAILURE OF 1RWST SQUIB VALVE 1208 1.46E-03 IRWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG T5 4.87E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE OF IRWST $0UlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF 1RWST SQUlB VALVE 120B 1.46E 03 IRWM0012 76 4.87E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FAILURE OF 1RWST SQUIB VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PMSM001 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 77 4.81E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PMA030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119Go HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119G0 78 4.81E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119Go COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 -

CCX PMB030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 79 4.08E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCRIEN PLUGGING 1.20E-05 REX FL-GP 80 4.01E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E -03 IRWM0012 81 4.01E 14

.00 INITI ATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE REclRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 82 4.01E-14

.00 INITIATING EVENT

MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REB"V119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX Ph?030 HARDWARE FAILURE OF 1RWST SOUlB VALVE 120A 1.46E 03 1RWM0010 83 4.01E*14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE OF IRWST SOUlB VALVE 1208 1.46E 03 IRWM0012 COMMON CAU$C FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS To OPEN 1.75E 03 REACV119GO

File: 2LMLO 03. DES Crsited: Fri May 24 14:17:58 1996 Page 6 of 7 Len;th: 51147 bytes Queued: Fri M:y 24 17:25:02 1996 84 3.60E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 85 3.60E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC1Br012TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS To OPEN

1. 75E-03 REACV119GO 86 3.60E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MA!NTENANCE 2.70E 03 EC1BS121TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 87 3.60E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 88 3.60F-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM HARDWARE FAILURE CAUSE RECIRC. CV 1199 FAILS TO OPEN

1. 75E-03 REBCV119GO 89 3.60E 14'

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS221TM HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN

1. 75E-03 REBCV119GO 90 3.58E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWMOD03 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 91 3.58E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWMOD03 RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 92 3.50E-14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001

)

HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACv119Go RELAY FAILS TO OPERATE 8.76E 04

!WCRS120BFA 93 3.50E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE REClRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO RELAY FAILS TO OPERATE 8.76E-04 IWDR$120AFA 94 3.50E-14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA HARDWARE FAILURE CAUSF RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 RELAY FAILS TO OPERATE 8.76E-04 IWDRS120AFA 95 3.50E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT DCCURS 1.62E-04 IEV MLOCA RELAY FAILS TO OPERATE 8.76E-04 IWCR$120BFA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 96 3.41E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS

'1.62E 04 IEV MLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF IRWST SQUIB VALVE 120B 1.46E-03 1RWM0012 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 97 3.40E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV MLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO MOV 117A UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REAMOV117TM 98 3.40E 14

.00 INITIATING EVENT - MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV MLOCA MOV 11TB UNAVAll DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REBMOV117TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAliS TO OPEN 1.75E 03 REBCV119Go SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 99 3.35E 14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E-04 IEV-MLOCA

File: 2LMLO 03. DES Crscted: Fri M:y 2416:17:581996 Page 7 of 7 Length: 51147 bytes Queued: Fri M:y 2417:25:021996

' COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX Pt4A030 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 100 3.35E-14

.00 INITIATING EVENT MEDIUM LOCA EVENT OCCURS 1.62E 04 IEV-MLOCA HARDWARE FAILURE OF IRWST SQUIB VALVE 120B 1.46E 03 IRWM0012 COMMON CAUSE FA! LURE OF OUTPUT LOG!C GROUPS 9.69E-05 CCX*PM6030 HARDWARE FAILURE OF IRWST SoulB VALVE 120A 1.46E-03 IRWM0010 e

0 4

3

~ ~ ~

v-rr-e-w-.

r File: 2LNLO 03. DES Crccted: Fri May 24 16:18:08 1996 Page 1 of 7 Length: 51147 bytes Queued: Fri May 24 17:25:02 1996

- "* DOMINANT CUTSETS *****

Page:

1 Titto: AP600 7 File 2LNLO 03.WLK ( File created by linking nloca.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 2.4360E 08 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

2.00E 08 82.10 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 2

3.68E 09 15.11 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN-MAN 04 3

1.30E 10

.53 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04

!EV NLOCA HARDWARE FAILURE OF NORMAL RHR !$0LATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 4

1.30E 10

.53 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 5

'1.30E 10

.53 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 6

4.53E 11

.19 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX-KV1-GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 7

4.44E 11

.18 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.406-04 REB-PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 8

2.68E-11

.11 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E-03 RHN MAN 01 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 9

2.38E 11

.10 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE OF N RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E 02 RNAM0009 HARDWARE FAILURE OF N-RHR VALVES ON DYI LINE B (V 0158 & 017B) 5.07E 02 RNBM0010 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 10 1.62E 11

.07 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75E-03 RNNCV013GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 11 1.41E 11

.06 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR COMMON CAUSE FAILURE OF CONTAINMENT SUMP LEVEL TRANSMITTERS 3.84E-05 CCX VS FA 12-1.07E 11

.04 INITIATIhG EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 LEV-NLOCA N-RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAM0006 N RHR PUMP 018 FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SPO 3.40E 02 RNBM0007 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 13 7.11E 12

.03 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF N RHR PUMPS TO START 7.70E 04 RNX*PM FS COMMON CAUSE FAILURE OF RECIRC LINES DUE To SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 14 5.64E 12

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E*04 IEV NLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V007A/B TO OPEN 6.10E-04 RNX KV G0 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SC1EEN PLUGGING 1.20E-05 REX FL GP 15 4.05E-12

.02 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMXM001-S COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR 16 4.05E 12

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E 05 CCX-PMXM004-S COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR 17 3.88E 12

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119CO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001

1 Fils: 2LNLO 03. DES Crs ted: Fri M:y 2516:18:081996 l

Page 2 of 7 Length: 51147 bytis Queued: Fri ncy 24 17:25:02 1996 18 3.88E-12

.02 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 1RWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA-PLUG 19 3.24E 12

.01 INITI ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE OF 1RWST $0018 VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 20 3.24E-12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E 03 1RWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 21 3.17E 12

.01 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX-EP-SAM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE-04 IWX XMTR 22 2.77E-12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 23

2. 77E-12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA BUS IDSA-DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDD1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP 24 2.77E 12

.01 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA BUS IDSA-DK+1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDABSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 25 2.77E 12

.01 INITI ATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSD DS-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDS1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 26 2.77E 12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA BUS 10$0 0D 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDDITM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 27 2.77E-12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 28 2.22E-12

.01 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 29 1.94E 12

.01 INITIATING EVENT INTERMEDI ATE LOCA EVENT DCCURS 7.70E 04 IEV-NLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAT FAILS TO OPEPATE 8.76E 04 IWDR$120AF A HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 30 1.94E 12

.01 INITIATING FVENT INTERMEDI ATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAnLORE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 1RWM0003 RELAT FAILS TO OPERATE 8.76E 04 IWCR$120BFA SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 31 1.58E-12

.01 INITIAT!NG EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNBEP011SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 32 1.58E 12

.01 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNAEP022SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 33 1.5SE-12 01 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNDEP023SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGlWG 1.20E-05 REX FL GP 34 1.30E 12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAMOD1 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP 35 1.30E-12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMDM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP

_ = =,

4 File: 2LNLo 03. DES Cre:ted: Fri M:y 24 16:18:08 1996 Page 3 of 7 Length: 51147 bytes Queued: Fri M:y 24 17:25:02 1996 36 1.30E 12

.01 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E 04 CCX-PL4M001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 37 8.95E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 COMMON CAUSE FAILURE OF REC!RC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 38 8.95E 13

.00 INITIATING EVENT

!NTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PM0030 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 39 8.95E-13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PL403 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP 40 8.48E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUMP 01B FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SPO 3.40E 02 RNBMOD07 UNAVAILABILITT OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 41 8.48E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUMP 018 FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SPO 3.40E-02 RNBM0007 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS013TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 42 8.4BE 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAMOD06 UNAVAILABILITT OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX rL GP 43 8.4BE-13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV WLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAMOD06 BUS UNAVAILABLE DDE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023fM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 1

44 6.65E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA BUS IDSD-DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDDBSDS1TM SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 45 6.65E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVFNT OCCURS 7.70E 04 IEV NLOCA BUS IDSD DD-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04

!DDBSDD1TM SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWMOD01 46 6.65E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWMOD03 4

1 BUS UNAVAILABLE DUE TO TEST OR CORRCCTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 47 6.65E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDDITM SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 48 4.72E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA SUMP SCREEN B P!'JGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE OF 1RWST SQUIB VALVE 118A 1.46E 03 IRWM0009 49 4.72E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1.46E 03 1RWMOD11 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119G0 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 50 4.71E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF N RHR CHECK VALVES V017A/B TO OPEN 5.10E 05 RNX CV Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 51 4.60E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E-05 CCX PMAM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP

$2 4.60E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGlc GROUPS 4.98E-05 CCX PMDM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP

Filer 2LNLO 03. DES Created: Fri May 26 16:18:08 1996 Page 6 of F Length: 51147 bytes Queued: Fri Cay 25 17:25:02 1996 53 4.60E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E-05 CCX PLMM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 54 4.42E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 lEV NLOCA COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR 55 4.16E-13

.00 INIT!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02

!RWM0003 OPERATOR FA!LS TO THROTTLE NORMAL RHR PUMP DISCHARGE VALVE V011 3.75E 03 RHN-MAN 06 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 96 3.94E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 LEV-NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB-PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SQUlB VALVE 118A 1.46E 03 IRWM0009 97 3.94E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1:46E 03 IRWM0011 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG i

58 "3.68E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA FAILURE OF PMS, PLS AND DAS.!NDICATION FOR OPERATOR ACTIONS 1.00E-06 ALL IND-FAIL COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, SAT) 4.78E-04 IWX XMTR 59 3'40E-13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 4

60 3.33E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA j

COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO G1 3.33E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS t 70E 04 IEV NLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 62 2.83E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 33 REACV119GO RELAY FAILS TO OPERATE 8.76E 04 IWBR$118AFA 63 2.83E-13

.00 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 i

HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FA! LURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 64 2.83E-13

.00 INIT!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA i

HARDWARE FAILURE CAUSES REClRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF 1RWST SQUlB VALVE 1208 1.46E-03 IRWM0012 l

HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 65 2.83E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA RELAT FAILS TO OPERATE 8.76E-04 IWARS118BFA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 66 2.77E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 6F 2.77E 13

.00 INITIATING EVENT

INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO i

68 2.77E-13

.00 INITIATlWG EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001

l Fils: 2L::LO 03. DES Cr::ted: Fri May 24 16:18:08 1996 Fage 5 of 7 Length: 51147 bytes Queued: Fri sty 24 17:25:02 1996 HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E 03 IRWM0010 69 2.77E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 1RWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMSM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 70 2.36E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWOR$120AFA HARDWARE FAILURE OF IRWST SQU18 VALVE 118A 1.46E-03 IRWM0009 71 2.36E-13

.00 INITIATING EVENT INTERMEDIATF LOCA EVENT OCCURS 7.70E 04 IEV NLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 RES PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 RELAY FAILS TO OPERATE 8.76E 04 IWBR$118AFA 72 2.36E-13

.00 INIflATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 1RWM0003 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 HARDWARE FAILURE OF IRWST SQUIS VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSES REclRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 73

'2.36E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE OF IRWST SQUI8 VALVE 1188 1.46E-03 IRWM0011 RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 74 2.36E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA LVENT OCCURS 7.70E 04 IEV NLOCA RELAY FAILS TO OPERATE 8.76E 04 IWARS1188FA HARDWARE FAILURE OF IRWST SQUIB VALVE 120B 1.46E-03 IRWM0012 4

SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG I

75 2.31E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX-PMAM001 HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF IRWST Sou!8 VALVE 1208 1.46E-03 IRWM0012 76 2.31E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA HARDWARE FAILURE OF IRWST SQUIS VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PM8M001 HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 77 2.28E-13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS To ofEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO 08EN 1.75E-03 REBCV119GO 78 2.28E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV-NLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PM8030 HARDWARE FAILURE CAUSE RECIRC. CV 1'9A FAILS TO COEN 1.75E-03 REACV119G0 79 1.94E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 80 1.91E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 HARDWARE FAILURE CAUSE RECIRC CV 119A FAILS To OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 1RWM0012 81 1.91E-13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE OF IRWST SQUlB VALVE 1204 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE REC!RC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO 82 1.91E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX-PM8030 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 83 1.91E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMB030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO

F Her 2Lh o 03. DES Crocted: Fri M:y 24 14:18:08 1996 Page 6 of / Length: 11147 bytes Queued: Fri May 24 17:25:02 1996 84 1.71E-13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04

[EV NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN 2

~

UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC18$001TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119G0 85 1.71E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04

[EV NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 86 1.71E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 87 1.71E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV #LOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCv119GO 88 1.71E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC2BS022TM HARDWARE FAILURE CAUSE REclRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO 89 1.71E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 90 1.70E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E-04 IWDR$120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 91 1.70E-13

.00 INITI ATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 RELAY FAILS TO OPERATE 8.76E-04 IWCRS120BFA HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 92 1.66E-13

.00 INIT!ATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75 E-03 REACV119GO RELAY FAILS TO OPERATE 8.76E 04 IWCR$120BFA

'93 1.66E 13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV-NLOCA COMMON CAUSE FAILURE OF OUTPUT LOGlc I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 RECCV119GO 8.76E-04 IWDR$120AFA r

RELAY FAILS TO OPERATE 94 1.66E 13

.00 INITI ATING EVENT

INTERMEDIATE LOCA EVENT OCCURS

7. 70E-04 IEV-NLOCA HARDWARE FAILURE CAUSE REClRC. CV 1198 FAILS TO DPEN

1. 75 E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX-PMBM001 8.76E-04 IWDRS120AFA i

RELAY FAILS TO OPERATE 95 1.66E 13

.00 INITI ATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E- 04 JEV NLOCA 8.76E 04 IWCRS120BFA RELAY FAILS TO OPERATE COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE REClRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 96 1.62E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS

7. 70E- 04 IEV-NLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWMOD03 HARDWARE FAILURE OF 1RWST SQUlB VALVE 120B 1.46E 03 IRWMcD12 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 97 1.62E-13

.00 INITIATING EVENT - INTERMEDI ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO MOV 117A UNAVAll DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REAMOV117TM i

98 1.62E 13

.00 INITIATING EVENT INTERMED. ATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA MOV 1178 UNAVAll DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REBMOV117TM HARDWARE FAILURE CAUSE RECIRC CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG l

I 99 1.59E-13

.00 INITIATING EVENT - INTERMEDIATE LOCA EVENT OCCURS 7.70E-04 IEV NLOCA l

. -.... -.. =.- _-...

i File: 2LNLO 03. DES Crscted: Fri May 24 16:18:08 1996 Page 7 cf 7 Lon8ths 5114F bytes cueued: Fri May 24 17:25:02 1996

' COMMON CAUSE FAILURE OF QUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE OF 1RWST SQU18 VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF IRWST SQU18 VALVE 1208 1.46E-03 IRWM0012 100 1.59E 13

.00 INITIATING EVENT INTERMEDIATE LOCA EVENT OCCURS 7.70E 04 IEV NLOCA HARDWARE FAILURE OF IRWST SQUIS VALVE 1208 1.46E-03 1RWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM8030 HARDWARE FAILURE OF IRWST SQUIS VALVE 120A 1.46E 03 IRWM0010 l

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Filc: 2LRCS 03. DES Crceted: Fri May 25 16:18:52 1996 Page 1 of 7 Length: 55678 bytes Queued: Fri May 24 17:25:02 1996 4

** DOMINANT CUTSETS *****

Page 1

i Titto: AP600 7 Fils: 2LRCS 03.WLK ( WLINK2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PROSABILITY INCREASED)

Reduced Sun of Cutsets: 1.5450E 09 l

NUMSER CUTSET PROB PERCENT SASIC EVENT NAME EVENT PROS. IDENTIFIER 1

2.40E 10 15.53 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK OPERATOR FAILS TO PERFORM CONTROLLED SHUTDOWN (RTN MAN 01) 7.70E-04 OTH SDMAN COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA

]

2 2.30E 10 14.89 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK CVS DISCHARGE LINE FAILURE 7.37E-04 CVM0004 COMMON CAUSE FAILURE OF 4 50018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA j

3 1.49E 10 9.64 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 4

6.90E-11 4.47 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK i

CVS SUCTION FOM BORIC ACID TANK FAILURE 2.21E 04 CVM0001 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 5

4.42E 11 2.86 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 LEV-RCSLK OPERATOR FAILS TO PERFORM CONTROLLED SHUTDOWN (RTN MAN 01) 7.70E-04 OTH SOMAN COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 6

4.40E 11 2.85 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PL3M001 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN REClRC LINES 2.60E 05 IWX EV4-SA 7

4.23E 11 2.74 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK CVS DISCHARGE LINE FAILURE 7.37E 04 CVM0004 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 8

3.02E 11 1.95 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PL303 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4-SA 9

2.74E 11 1.77 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK COMMON CAUSE FAILURE OF P2R LEVEL SENSORS 4.78E 04 CCX-XMTR195 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL 31GNAL FAILS) 1.00E 02 REN MAN 04 10 1.84E 11 1.19 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK UNAVAILABILITY OF TRAIN "B" DUE TO MAINTENANCE (2) 2.19E-02 CV8PM01BTM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03' EC185001TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 11 1.84E 11 1.19 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK VWS MS 03 S2GMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VW8M0005 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 12 1.84E*11 1.19 INITIATING EVENT - RCS LEAK EVENT OCCURS

.?0E-02 IEV RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.*VE 02 VW8M0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 13 1.84E*11 1.19 !NITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VW8M0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM

+

COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 14 1.84E 11 1.19 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E-02 VWBM0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC185011TM COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 15 1.84E 11 1.19 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VWBM0005 8US UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS112TM COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E 05

!WX EV4 SA

I i

l Filer 2LRCS 03. DES Crocted: Fri M;y 24 16:18:52 1996 Page 2 ef 7 L ength: 55678 bytes Queued: Fri M;y 25 17:25:02 1996 16 1.84E-11 1.19 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VWaM0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM COMMON CAUSE FAILURE OF 4 Sou!B VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 17 1.54E 11 1.00 INITIATING EVENT RCS LEAK EVf.NT OCCUP' 1.20E 02 IEV ACSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURF rR MAINTENANCE 1.83E 02 VWBM0004 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF 4 50U18 VALVES IN RECIRC LINES 2.60E 05

!WX-EV4-SA I

18 1.54E 11 1.00 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E*02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013fM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 19 1.54E 11 1.00 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC1BS131TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 20 1.54E 11 1.00 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAlkTENANCE 2.70E 03 EC1BS011TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 21 1.54E 11 1.00 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS112TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 22 1.54E 11 1.00 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E-02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 23 1.2TE 11

.82 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK CVS SUCTION FOM BORIC ACID TANK FAILURE 2.21E-04 CVM0001 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE-04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E 02 REN MAN 04 24 1.15E 11

.74 INITIATING EVENT - RCS LEAK EVENT OCCUR $

1.20E-02 IEV RCSLK COMMON CAUSE FAILURE OF CVS PUMPS TO RUN 3.70E-05 CVX PM ER COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05

!WX EV4 SA 25 9.63E-12

.62 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK CVS TRAIN "A" HARDWARE FAILURES 1.41E 03 CVM0002 UNAVAILABILITY OF TRAIN "B" DUE TO MAINTENANCE (2) 2.19E-02 CVBPM01BTM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 26 9.43E-12

.61 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCfLK CVS TRAIN "B" HARDWARE FAILURES 1.12E-02 CVM0003 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 27 8.09E 12

.52 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PL3M001 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 28 6.88E 12

.45 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX-XMTR 29 5.56E 12

.36 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PL303 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT)

4. 78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN MAN 04 30 4.93E 12

.32 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK CVS TRAIN "A" HARDWARE FAILURES 1.41E 03 CVM0002 CVS TRAIN "B" HARDWARE FAILURES 1.12E-02 CVM0003 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REclRC LINES 2.60E 05 IWX EV4 SA 31 4.37E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK COMMON CAUSE FAILURE OF MOTOR DRIVEN PUMPS TO RUN 1.40E 05 CCX PM ER COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 32 4.36E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK

Filc: 2LRCS 03. DES Crested: Fri May 24 16:18:52 1996 Page 3 of 7 Length: 55678 bytes Queued: Fri M:y 25 17:25:02 1996 VWS UNIT COOLER MS07B SEGMENT HARDWARE FAILURE 5.18E-03 VWBM0006 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 33 4.36E-12

.28 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK VVS UNIT COOLER HS078 SECMENT HARDWARE FAILURE 5.18E 03 VWBM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS013TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05

!WX EV4-SA 35 4.36E 12

.28 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK VWS UNIT COOLER hS078 SEGMENT HARDWARE FAILURE 5.18E 03 VWSM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 35 4.36E 12

.28 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK VWS UNIT COOLER MS07B SEGMENT HARDWARE FAILURE 5.18E 03 VWBM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS011TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 36 4.36E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS UNIT COOLER MSOTB SEGMENT HARDWARE FAILURE 5.18E 03 VWBMOD06 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC1BS112TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 37 4.36E 12

.28 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK VWS UNIT COOLER MS0TB SEGMENT HARDWARE FAILURE 5.18E 03 VWBM0006 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 38 4.35E 12

.28 INITI ATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM OPERATOR FAILS TO ALIGN STANDBY VWS CHILLER 5.16E-03 VWN MAN 01 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 39 4.35E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS013TM OPERATOR FAILS TO ALIGN STANDBY VWS CHILLER 5.16E 03 VWN MAN 01 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 40 4.35E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS131TM OPERATOR FAILS TO ALIGN STANDBY VWS CHILLER 5.16E 03 VWN-MAN 01 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 41 4.35E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM OPERATOR FAILS TO ALIGN STANDBY VWS CHILLER 5.16E 03 VWN MAN 01 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REClRC LINES 2.60E 05 IWX EV4-SA 42 4.35E 12

.28 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS112TM OPERATOR FAILS TO ALIGN STANDBY VWS CHILLER 5.16E 03 VWN-MAN 01 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 43 4.35E 12

.28 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM OPERATOR FAILS TO ALIGN STANDBY VVS CHILLER 5.16E 03 VWN MAN 01 COMMON CAUSE FAILURE OF 4 SQUla VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 44 4.28E 12

.28 !NITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12]

5.08E-03 ECOM0001 BATTERY DB1 UNAVAILABLE 2.70E-03 ED1M0003 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 45 4.18E 12

.27 INITI ATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK VWS PUMP MP 02 SEGMENT HARDWARE FAILURE 6.12E-04 VWAM0002 VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E-02 VWBM0005 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05

!WX EV4 SA (6

3.74E 12

.24 INITIATING EVENT - RCS LEAK EVENT DCCURS 1.20E-02 IEV-RCSLK COMMON CAUSE FAILURE OF UNIT COOLER FANS TO RUN 1.20E-05 CCX BL ER COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 47 3.74E-12

.24 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV*RCSLK COMMON CAUSE FAILURE VWS CHILLERS TO RUN 1.20E 05 VWX RF ER COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REC!RC LINES 2.60E-05 IWX fv4 SA 48 3.49E 12

.23 !NITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK

1 Files 2LRCS 03. DES Ces:ted: Fri M2y 2s 16:18:52 1996 Page 4 of 7 Length: 55678 bytes Queued: Fri M2y 2417:25:021996 6.12E-04 VWAM0002 VWS P9MP MP 02 SEGMENT HARDWARE FAILURE VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E-02 VWBM0004 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 49 3.43E 12

.22 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK COMMON CAUSE FAILURE OF SOFTWARE FOR OUTPUT LOGIC GROUPS 1.10E 05 CCX PL3M001 SW COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 50 3.39E-12

.22 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK UNAVAILABILITY OF TRAIN "B" DUE TO MAINTENANCE (2) 2.19E-02 CVBPM01BTM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP REClR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 51 3.39E 12

.22 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E-02 VW8M0005 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 52 3.39E 12

.22 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VW8M0005 BUS UNAVAILABLE DUE To UNSCHEDULED MAlWTENANCE 2.70E 03 EC1BS01374 5

COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.75E 04 IWX XMTR 1

OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 j

53 3.39E 12

.22 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VWBM0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS131TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 54 3.39E-12

.22 INITIATING EVENT RCS LEAR EVENT OCCURS 1.20E-02 IEV-RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E 02 VWBM0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 55 3.39E 12

.22 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E-02 VWBM0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS112TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 l

56 3.39E-12

.22 INITIATING EVENT RCS LEAK EVENT OCCURS

't.20E 02 IEV RCSLK j

VWS MS 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 2.19E-02 VWBM0005 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $!GNAL FAILS) 1.00E-02 REN MAN 04

'57 3.35E 12

.22 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 201DG001TM MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12]

5.08E 03 ECOM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO20G002TM COMMON CAUSE FAILURE OF 4 50VIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 58 3.1TE-12

.21 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK COMMON CAUSE FAILURE TO START OF ENGINE-DRIVEN FUEL PUMPS 2.00E-03 Z0X PD ES l

MAIN GEN. SKR ES 01 FAILS TO OPEN !# 12]

5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REclRC LINES 2.60E-05 IWX-EV4 SA 59 2.83E 12

.18 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBM0004 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR

,~

OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN-MAN 04 60 2.83E-12

.18 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC18$013TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN MAN 04 61 2.83E 12

.18 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E-02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04

Fils: 2LRCS 03. DES Cessted: Fri May 24 11:18:52 1996 Page 5 of 7 Length: 55678 bytes Queued: Fri May 24 17:25:02 1996 62 2.83E 12

.18 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK WS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBM0004 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS011TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE 04 IWX-XMTR t

OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 4

63 2.83E 12

.18 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E 02 VWBMcD04 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS112TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP REC!R. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 64 2.83E 12

.18 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK VWS PUMP MP 03 SEGMENT HARDWARE FAILURE OR MAINTENANCE 1.83E-02 VWBMOD04 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.7BE 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04

~

65 2.k9E12

.17 INITIATING EVENT - RCS LEAK EVENT DCCURS 1.20E 02 IEV RCSLK COMMON CAUSE FAILURE OF PLS OUTPUT DRIVER (EPO) BOARDS 8.62E 06 CCX EP SA COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 9

7 66 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC18$001TM BATTERT DB1 UNAVAILABLE 2.70E 03 ED1 MOD 03 COMMON CAUSE FAILURE OF 4 SOUlB VALVES IN REC!RC LINES 2.60E 05

!WX EV4 SA 67 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM UNAVAILABILITY OF BUS ECS ES 2 DUE To UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF 4 $0UlB VALVES IN REClRC LINES 2.60E 05 IWX-EV4 SA 68 2.27E 12

.15 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IdX EV4-$A 69 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM BUS UNAVAILABLE DUE To UNSCHEDULED KAINTENANCE 2.70E 03 EC2BS231TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA

=

i 70 2.27E 12

.15 INITI ATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS013TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF 4 SOU!B VALVES IN RECIRC LINES 2.60E 05 IWX EY4 SA i

71 2.27E 12

.15 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC185013TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285023TM COMMON CAUSE FAILURE OF 4 S0U18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 72 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013fM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS231TM COMMON CAUSE FAILURE OF 4 Sou!B VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 73 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS131TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF 4 $0UlO VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 74 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE To UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023fM COMMON CAUSE FAILURE OF 4 50UlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 75 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE To UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS2317M l

COMMON CAUSE FA! LURE OF 4 $001B VALVES IN RECIRC LINES 2.60E 05 IWX EVI SA 76 2.27E 12

.15 INITI ATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TJ UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS021TM COMMON CAUSE FAILURE OF 4 $0U18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA

File: 2LRCS 03. DES Crcated: Fri May 24 16:18:52 1996 Page 6 of 7 Length: 55678 bytzs Queued: Fri ray 24 17:25:02 1996 77 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 ECIBS001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS212rM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 78 2.2TE 12

.15 !NITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK

)

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013TM I

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS021TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 79 2.2TE 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS212TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 80 2.27E 12 15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS021TM COMMON CAUSE FAILURE OF 4 SOU!B VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 81 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS212TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA l

82 2.27E-12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM l

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 83 2.2TE 12 15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013fM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM l

COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 84 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS131TM i

I BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 65 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT DCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM BATTERY DB1 UNAVAILABLE 2.70E 03 ED1M0003 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 86 2.27E 12

.15 INITI ATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM UNAVAILABILITY OF BUS ECS ES 2 DUE 70 UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 87 2.27E-12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02' IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023fM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REC!RC LINES 2.60E 05 IWX EV4 SA 88 2.2TE-12

.15 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS231TM COMMON CAUSE FAILURE OF 4 S0018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 89 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS112TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 90 2.27E 12

.15 INITI ATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MA!NTENANCE 2.70E-03 EC1BS112TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS0237M COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 91 2.27E-12

.15 INITIATING EVENT - RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS112TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS231TM COMMON CAUSE FAILURE OF-4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 92 2.2TE 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK SUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM BUS UNAVAILABLE DUE TO UNSCHEDULE'D MAINTENANCE 2.70E 03 EC2BS021TM

)

i Filer 2LRCS 03. DES Crscted: Fri May 24 14:18:52 1996 l

Page 7 of 7 Lengths 55678 bytes oueued: Fri M;y 24 17:25:02 1996 i

COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 93 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC185011TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS212TM COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 94 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC185112TM BUS UNAVAILABLE DUE TO UNSCH50VLED MAINTENANCE 2.70E 03 EC2BS021TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 95 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS112TM BUS UNAVAILABLE DUE TO UNSCHEDULE0 MAINTENANCE 2.70E 03 EC2BS212TM COMMON CAUSE FAILURE OF 4 SOUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 96 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1B5011TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM COMMON CAUSE FAILURE OF 4 $0UlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 97 2.2TE 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV-RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS112TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM COMMON CAUSE FAILURE OF 4 $0VIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 98 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK 4

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC285002TM COMMON CAUSE FAILURE OF 4 $0018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 99 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E-02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.7DE 03 EC1BS012TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.7DE 03 EC2BS023TM COMMOW CAUSE FAILURE OF 4 Sou!B VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 100 2.27E 12

.15 INITIATING EVENT RCS LEAK EVENT OCCURS 1.20E 02 IEV RCSLK BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC185012TM 1

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS231TM COMMON CAUSE FA! LURE OF 4 SOU18 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA J

4 l

i i

Fit: 2LSLO 03.0ES Crc.ted: Fri May 24 16:19:02 1996 Page 1 of 7 Length: 51147 leytes Queued: Fri May 24 17:25:02 1996 4

- - - - DOMINANT CUTSETS *****

Page:

1 l

Titto: AP600 7 fils: 2LSLO 03.WLK ( File created by linking stoca.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 3.2020E-09 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

2.63E 09 82.14 lNITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 2

4.83E 10 15.08 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 3

1.71E 11

.53 INITIATING EVENT - SMALL LOCA EVENT OCCURS.

1.01E 04 IEV SLOCA HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 4

1.71E 11

.53 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 j

COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 5

1.71E 1'1

.53 INITIATING EVENT SMALL LorA EVENT OCCURS 1.01E-04 IEV SLOCA 1.41E-02 RN23M005 HARDWARE FAILURE OF N RER MOV V023 FT0/CB FTC/ RELAY FTC COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 6

5.94E 12

.19 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX KV1-GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 7

5.82E 12

.18 INITIATING EVENT - SMALL LOCA EVEPT OCCURS 1.01E-04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB-PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40F 04 REA PLUC 8

3.51E 12

.11 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E-03 RHN MAN 01 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP l

9 3.12E 12

.10 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV-SLOCA HARDWARE FAILURE OF N RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E 02 RNAM0009 HARDWARE FAILURE OF N RHR VALVES ON DVI LINE B (V 015B & 017B) 5.07E-02 RNBM0010 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 10 2.12E 12

.07 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV-SLOCA N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75E-03 RNNCV013GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 11 1.85E 12

.06 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04

!EV SLOCA COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR COMMON CAUSE FAILURE OF CONTAINMENT SUMP LEVEL TRANSMITTERS 3.84E 0$

CCX VS FA 12 1.40E 12

.04 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV-SLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAMOD06 N RNR PUMP 01B FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SP0 3.40E 02 RNBMOD07 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 13 9.33E 13

.03 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA C0f040N CAUSE FAILbRE OF N RHR PUMPS TO START 7.70E 04 RNX PM FS COB 040N CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 14 7.39E 13

.02 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V007A/B TO OPEN 6.10E 04 RNX KV Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP l

15 5.31E 13

.02 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 5 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR 16 5.31E 13

.02 INIT!ATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E 05 CCX PMXM004 S C0f040N CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR 17 5.09E-13

.02 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA

~$ UMP SCREEN 8 '"./.;ws AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWMOD01

l File: 2LSLO 03.0ES Cracted: Fri r.:y 24 16:19:02 1996 PaBe 2 cf 7 LenSth: 51147 bytes Queued: Fri Pay 24 17:25:02 1996 18 5.09E 13

.02 INITI ATING EVENT - SMALL LOCA EVENT DCCURS 1.01E 04 IEV-SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO DPEN 1.75E-03 REBCV119GO sump SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 19 4.25E 13

.01 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA l

$ UMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 20 4.25E 13

.01 INITI ATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E 03 1RWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 21 4.16E 13

.01 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP-SAM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR 22 3.64E-13

.01 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA BUS IDSA DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDABSDS1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 23

' 3.64E 13

.01 INITIATING EVENT SMALL LOCA EVENT DCCURS 1.01E 04 IEV SLOCA BUS IDSA DD 1 UNAVAILABLE DDE TO TEST OR CORRECTlvE MAINTENANCE 3.00E-04 IDABSDDITM i

COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 24 3.64E-13

.01 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA BUS IDSA DK 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDABSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 23 3,64E 13

.01 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA 1

BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAlWTENANCE 3.00E 04 IDDBSDS1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP a

26 3.64E 13

.01 INITIATING EVENT - SMALL LOCA EVENT DCCURS 1.01E-04 IEV SLOCA BUS IDSD-DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDD1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 27 3.64E 13

.01 INITIATING EVENT - SMALL LOCA EVENT DCCURS 1.01E-04 IEV-SLOCA BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDK1TM COMMON CAUSE FAILURE OF RECIRC LINES DUE To SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 28 2.91E 13

.01 INITIATING EVENT - SMALL LOCA EVENT OCCURS

~1.01E 04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 29 2.55E 13

.01 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA HARDWARE FAILUDI CAu?ES RECIRC MOV 1?7A FAILS TO OPEN 1.20E 02 IRWM0001 30 2.55E-13

.01 INITI ATING EVENT SMALL LOCA EVENT 0.* CURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSES RECIRC MOV liTB FAILS TO OPEN 1.20E 02 1RWM0003 RELAY FAILS TO OPERATE 8.76E 04 IWCRS120BFA SUMP SCREEN A PLUGS AND PRr. VENTS FLOW 2.40E 04 REA PLUG 31 2.07E-13

.01 INITIATING EVENT SMALL LLTA EVENT OCCURS 1.01E-04 IEV SLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNBEP011SA COMMON CAUSE FAILURE OF RECIRC LIh:5 DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 32 2.07E 13

.01 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA FAILURE OF OUTPUT DRIVER 1.71E-04 RNAEP022SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 33 2.0TE-13

.01 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA FAILURE OF OUTPUT DRIVER 1.71E 04 RNDEP023SA COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 34

.1.71E-13

.01 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMAM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 35 1.71E 13

.01 INITI ATING EVENT

SMALL LOCA EVENT OCCURS 1.01E 04 IEV $LOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX-PMDM001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP

File: 2LSLO 03. DES Cre:ted: Fri Zay 24 16:19:02 1996 Page 3 of 7 Length: 51147 bytes Queued: Fri M;y 2417:25:021996 36 1.71E 13

.01 INITI ATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC !/Os 1.41E-04 CCX PL4M001 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 37 1.17E-13

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E- 04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 38 1.17E 13

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM0030 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL-GP 39 1.17E-13

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PL403 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 40 1.11E 13

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA N RHR PUMP 01B FAILS /ST CK V007B/CB FTC/RE FTC/CB ECS221 SPJ 3.40E 02 RNBM0007 UKAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FA! LURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 41 1.11E-13

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA N RHR PUMP 018 FAILS /ST CK V0078/CB FTC/RE FTC/CB ECS221 SPO 3.40E 02 RNSM0007 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS013TN COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 42 1.11E 13

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E 02 RNAM0006 2

UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM l

COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20F 05 REX FL-GP 43 1.11E-13

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA N RHR PUMP 01A FAILS /ST CK V007A/CB FTC/RE FTC/CB ECS122 SPO 3.40E-02 RNAMOD06 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023TM COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 44 8.73E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA BUS IDSD DS 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSDS1TM SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB-PLUG HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 1RWM0001 9

45 8.73E 14

.00 INIT!ATING EVENT SMALL LOCA EVENT OCCUR $'

1.01E 04 IEV-SLOCA BUS 10S0 00-1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDDBSD01TM SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG i

HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 46

8. 73E-14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E-02 1RWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 IDCBSDS1TM SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA-PLUG 47

8. 73E -14

.00 INITIATING EVENT - SMALL LOCA EVENT DCCURS 1.01E 04 IEV-SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E 02 1RWM0003 BUS UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04 IDCBSDDITM SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E-04 REA PLUG 48 6.19E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA SUMP SCREEN 8 PLUCS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF 1RWST SQUlB VALVE 118A 1.46E-03 IRWM0009 49 6.19E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 118B 1.46E-03 IRWM0011 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 50 6.18E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF N RHR CHECX VALVES V017A/B TO OPEN 5.10E-05 RNX*CV-GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 51 6.04E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.9BE 05 CCX PMAM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 52 6.04E-14

.00 INITI ATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E 05 CCX-PMDM004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-CP

Filc: 2LSLO 03. DES Crssted: Fri May 24 16:19:02 1996 Page 4 of 7 Length: 51147 bytes cueued: Fri May 24 17:25:02 1996 53 6.04E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF MUX LOGIC GROUPS 4.98E-05 CCX PLMMOG4 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 rex FL-GP 54 5.79E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMUN CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR 55 5.45E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 OPERATOR FAILS TO THROTTLE NORMAL RNR PUMP DISCHARGE VALVE V011 3.75E 03 RHN-MAN 06 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 rex FL GP 56 5.17E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SQUIB VALVE 118A 1.46E-03 IRWM0009 57 5.17E 14

.00 INITI ATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04

!EV-SLOCA HARDWARE FAILURE OF IRWST Sou!B VALVE 1188 1.46E 03 IRWM0011 HARDWARE FAILURE OF IRWST Sou!B VALVE 1200 1.46E-03 IRWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 58 4.83E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA FAILURE OF PMS, PLS AND DAS INDICATION FOR OPERATOR ACTIONS 1.00E 06 ALL-IND FAIL COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR 59 4.45E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E-02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119G0 HARD6MRE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 60 4.36E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 61 4.36E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT logic I/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119Go 62 3.72E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV-SLOCA SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E

03 REACV119G0 j

RELAY FAILS TO OPERATE 8.76E-04 IW8R$118AFA i

63 3.72E-14

.00 INITI ATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA J

HARDWARE FAILURE CAUSES RECIRC MOV 117B FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO HARDWARE FAILURE OF 1RWST SQUlB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWMOD01 j

64 3.72E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 11TB FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF IRWST SQUIB VALVE 1208 1.46E 03 IRWM0012 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 65 3.72E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA RELAY FAILS TO OPERATE 8.76E 04 IWARS1188FA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO DPEN 1.75E 03 REBCV1190G SUMP SCREEM A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLU4 66 3.64E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV-5LOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX >MAM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACv119Go HARDWARE FAILURE OF IRWST $QU18 VALVE 1208 1.46E 03 IRWM1012 67 3.64E-14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV tLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX P(AM001 HARDWARE FAILURE OF IRWST Soula VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO 68 3.64E-14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 F AILS TO OPEN 1.75E-03 RE8CV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMBM001

File: 2LSLO 03.0ES Crseted: Fri t y 25 16:19:02 1996 Page 5 cf 7 Length: 51147 bytes Queued: Fri MIy 24 17:25:02 1996 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 69 3.64E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE OF 1RWST $Q018 VALVE 1208 1.46E 03 IRWM0012 1

COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E 04 CCX PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 70 3.10E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG RELAY FAILS TO OPERATE 8.76E-04 IWOR$120AFA HARDWARE FAILURE OF 1RWST SQUlB VALVE 118A 1.46E 03 IRWM0009 71 3.10E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 i

RELAY FAILS TO OPERATE 8.76E 04 IWBRS118AFA 72 3.10E 14

.00 INITIATING EVENT

SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA HARDWARE FAILURE CAUSES REclRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWM0003 HARDWARE FAILURE OF IRWST SQUIS VALVE 120s 1.46E 03 IRWM0012 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWM0001 73 3.10E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE OF IRWST SQUlB VALVE 1188 1.46E 03 IRWM0011 RELAY FAILS TO OPERATE 8.76E 04 IWCRS1208FA 1

SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 74 3.10E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA RELAY FAILS TO OPERATE 8.76E 04 IWARS1188FA HARDWARE FAILURE OF IRWST SQUl8 VALVE 1208 1.46E 03 IRWM0012 SUMP SCREEN A PLUGS AND PREVENTS FLGW 2.40E 04 REA PLUG 75 3.04E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX FMAM001 HARDWARE FAILURE OF IRWST SQUIB VALVE 120A 1.46E-03 IRWM0010 HARDWARE FAILURE OF IRWST SQUlB VALVE 1208 1.46E-03 IRWM0012 76 3.04E-14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA HARDWARE FAILURE OF IRWST SQU18 VALVE 120s 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PM8M001 HARDWARE FAILURE OF 1RWST SQUIB VALVE 120A 1.46E 03 IRWM0010 77 3.00E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE CAUSE RECIRC CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 78 3.00E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 RE8CV119GO CONMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM8030 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 79 2.55E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSES REC 1RC MOV 1178 FAILS TO OPEN 1.20E-02 IRWM0003 i

HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL*GP 80 2.50E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E-05 CCX PMA030 HARDWARE FAILLAE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO HARDWARE FAILURE OF IRWST SQU18 VALVE 1208 1.46E 03 IRWM0012 81 2.50E-14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE OF IRWST SQU18 VALVE 120A 1.46E-03 IR WOO 10 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO 82 2.50E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119GO COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM8030 HARDWARE FAILURE OF IRWST SQUlB VALVE 120A 1.46E 03 IRWM0010 83 2.50E 14

.00 INITIATING EVENT

SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA HARDWARE FAILURE OF IRWST SQU18 VALVE 1208 1.46E 03 IRWM0012 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PM8030 HARDWARE FAILURE CAUSE RECIRC. CV 1194 FAILS TO OPEN 1.75E 03 REACV119GO

1 I

File: 2LSLO 03.0ES Cestted: Fri M2y 24 16:19:02 1996 Page 6 of 7 Length: 51147 bytes Queued: Fri 11:y 2417:25:021996 84 2.24E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 85 2.24E-14 00 INIT!ATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 86 2.24E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS121TM HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO 87 2.24E 14

.00 INITI ATlWG EVENT

SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN UNAVAILABILITY OF SUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM HARDWARE FAILURE CAUSE RECIRC. CV 119B FAILS TO OPEN 1.75E 03 REBCV119Go 88 2.24E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN SUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS022TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN

1. 75E-03 REBCV119GO 89 2.24E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS221TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 RE8CV119GO 90 2.23E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWN0003 HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119GO RELAY FAILS TO OPERATE 8.76E 04 IWDRS120AFA HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E-02 IRWMOD01 91 2.23E 14

.00 INITIA?!NG EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E-02 IRWMOD03 RELAY FAILS TO OPERATE

' 8.76E 04 IWCR$1208FA HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E-03 REACV119GO HARDWARE FAILURE CAUSES RECIRC MOV 117A FAILS TO OPEN 1.20E 02 IRWM0001 92 2.18E-14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV-SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC 1/Os 1.41E 04 CCX-PMAM001 i

HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO

)

RELAY FAILS TO OPERATE 8.76E-04

!WCRS120eFA 93 2.18E-14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E-04 IEV-SLOCA COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX PMAM001 HARDWARE FAILURE CAUSE REclRC. CV 1198 FAILS TO OPEN 1.75E 03 REBCV119Go RELAY FAILS TO OPERATE 8.76E 04 IWDR$120AFA 1

94

-2.18E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO OPEN 1.75E-03 REBCV119G0 COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PMSM001 RELAY FAILS TO OPERATE 8.76E 04 IWDRS120AFA 95 2.18E-14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA RELAY FAILS TO OPERATE 8.76E 04 IWCR$1208FA COMMON CAUSF FAILURE OF OUTPUT LOGIC I/Os 1.41E 04 CCX-PMBM001 HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN

1. 75E-03 REACV119GO 96 2.12E 14

.00 INITIATING EVENT - SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA f

HARDWARE FAILURE CAUSES RECIRC MOV 1178 FAILS TO OPEN 1.20E 02 IRWMOD03 HARDWARE FAILURE OF IRWST $0VIB VALVE 120s 1.46E-03 1RWM0012 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 97 2.12E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG HARDWARE FAILURE CAUSE RECIRC. CV 119A FAILS TO OPEN 1.75E 03 REACV119GO MOV 117A UNAVAll DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E 04 REAMOV1177M 98 2.12E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E-04 IEV SLOCA MOV 1175 UNAVAIL DUE TO TEST AND UNSCHEDULED MAINTENANCE 5.00E-04 REBMOV117TM HARDWARE FAILURE CAUSE RECIRC. CV 1198 FAILS TO GPEN

1. 75E-03 REBCV119GO SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 99 2.09E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA

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Fils: 2LSLO 03.0ES-Crscted: Fri May 24 16:19:02 1996 Page 7 sf 7 Length: 51147 bytes Queued: Fri May 24 17:25:02 1996 COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX PMA030 HARDWARE FAILURE OF IRWST SQU!B VALVE 120A 1.46E 03 IRWM0010 HARDWARE FAILURE OF IRWST SQUla VALVE 1208 1.46E-03 IRWM0012 100. 2.09E 14

.00 INITIATING EVENT SMALL LOCA EVENT OCCURS 1.01E 04 IEV SLOCA HARDWARE FAILURE OF IRWST SoulB VALVE 1200 1.46E 03 IRWM0012 i

COMMON CAUSE FAILURE OF OUTPUT LOGIC GROUPS 9.69E 05 CCX-PMB030 f

HARDWARE FAILURE OF 1RWST SQUIB VALVE 120A 1.46E-03 IRWM0010 l

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4

Fil 2RLLO-11. DES Cr;;ted: Fri May 25 16:19:10 1996 Page 1 of 2 Length: 9756 bytes Queued: Fri May 24 17:25:02 1996

- - - - 00MINANT CUTSETS *****

Page 1

Title:

AP600-7 Fils: 2RLLO-11.WLK ( File created by linking Lloca.in WLINK2 ** Ver. 4.02 **)

Reduced Sun of Cutsets: 7.2450E 09 WUMSER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

5.35E 09 73.84 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA COMMON CAUSE FAILURE OF 2 ACCUMULATOR CHECK VALVES 5.10E-05 ACX CV-GO 2

3.22E 10 4.44 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA ACCUMULATOR CHECK VALVE 0298 FAILS TO OPEN 1.75E-03 ACBCVC29GO ACCUMULATOR CHECK VALVE 029A FAILS TO OPEN 1.75E-03 ACACV029Go 3

3.22E 10 4.44 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR CHECK VALVE 0299 FAILS TO OPEN 1.75E-03 ACBCv029Go ACCUMULATOR CHECK VALVE 028A FAILS TO OPEN

1. 75E-03 ACACV028Go 4

3.22E 10 4.44 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA ACCUMULATOR CHECK VALVE 0288 FAILS TO OPEN

1. 75E-03 ACsCv028GO ACCUMULATOR CHECK VALVE 029A FAILS TO OPEN

1. 75E-03 ACACV029Go 5

3.22E 10 4.44 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR CHECK VALVE 0288 FAILS To OPEN 1.75E-03 AC8Cv028Go ACCUMULATOR CHECK VALVE 028A FAILS TO OPEN 1.75E-03 ACACV028Go 6

1.34E-10 1.85 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA

)

ACCUMULATOR' FLOW TUNING ORIFICE PLUCS 7.27E-04 AC80R001SP ACCUMULATOR CHECK VALVE 029A FAILS TO OPEN 1.75E 03 ACACV029Go 7

1.34E 10 1.G5 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E-04 AC80R00fSP ACCUMULATOR CHECK VALVE 028A FAILS TO OPEN 1.75E 03 ACACV028Go 8

1.34E 10 1.85 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR CHECK VALVE 0299 FAILS TO OPEN 1.75E-03 ACBCv029GO ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E-04 ACAOR001SP 9

1.34E 10 1.85 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA I

I ACCUMULATOR CHECK VALVE 0288 FAILS TO OPEN -

1.75E-03 ACBCV028GO ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E-04 ACAOR001SP 10 5.55E 11

.77 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA 7.27E-04 AC80R001SP ACCUMULATOR FLOW TUNING ORIFICE PLUGS ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E 04 ACADR001SP 11 1.26E 11

.17 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.0$E-04 IEV-LLOCA COMMON CAUSE FAILURE OF ACCUMULATOR TANKS 1.20E-07 ACX-TK-AF 12 4.41E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA ACCUMULATOR TANK T0018 RUPTURES 2.40E-06 ACSTK001AF ACCUMULATOR CHECK VALVE 029A FAILS TO OPEN 1.75E-03 ACACV029Go 13 4.41E-13

.01 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR TANK T001B RUPTURES 2.40E-06 ACBTK001AF ACCUMULATOR CHECK VALVE 028A FAILS TO OPEN 1.75E 03 ACACV028Go 14 4.41E 13

.01 INITI ATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR CHECK VALVE 029B FAILS TO DPEN 1.75E-03 ACBCV029GO ACCUMULATOR TANK T001A RUPTURES 2.40E-06 ACATK001AF 15 4.41E 13

.01 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA I

ACCUMULATOR CHECK VALVE 028B FAILS TO OPEN

1. 75E-03 ACBCv028Go ACCUMULATOR TANK T001A RUPTURES 2.40E-06 ACATK001AF i

16 1.83E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV-LLOCA ACCUMULATOR TANK T001B RUPTURES 2.40E-06 ACBTK001AF ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E-04 ACAOR001SP 17 1.83E 13

.00 INITIATING EVENT - LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR FLOW TUNING DRIFICE PLUGS 7.2TE-04 AC80R001SP ACCUMULATOR TANK T001A RUPTURES 2.40E-06 ACATK001AF 18 1.32E 13

.00 INITI ATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR FLOW TUNING ORIFICE RUPTURES 7.20E-07 ACBOR001EB ACCUMULATOR CHECK VALVE 029A FAILS TO OPEN 1.75E 03 ACACV029Go

File: 2RLLO 11. DES Created: Fri shy 24 16:19:10 1996 Page 2 of 2 Length: 9755 bytes Ques.es: Fri M:y 24 17:25:02 1996 19 1.32E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA ACCUMULATOR FLOW TUNING ORIFICE RUPTURES 7.20E 07 ACBOR001E8 ACCUMULATOR CHECK VALVE 028A FAILS TO OPEN 1.75E 03 ACACV028Go 20 1.32E 13

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA ACCUMULATOR CHECK VALVE 0298 FAILS TO OPEN 1.75E-03 ACBCV029Go ACCUMULATOR FLOW TUNING ORIFICE RUPTURES 7.20E 07 ACAOR001EB 21 1.32E 13 00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA ACCUMULATOR CHECK VALVE 0288 FAILS TO OPEN 1.75E-03 ACBCV028Go ACCUMULATOR FLOW TUNING ORIFICE RUPTURES 7.20E 07 ACA0R001EB 22 5.50E 14

.00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E 04 IEV LLOCA ACCUMULATOR FLOW TUNING ORIFICE RUPTURES 7.20E-07 ACBOR001EB ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E 04 ACAOR001SP 23 5.50E 14 00 INITIATING EVENT LARGE LOCA EVENT OCCURS 1.05E-04 IEV-LLOCA ACCUMULATOR FLOW TUNING ORIFICE PLUGS 7.27E-04 ACBOR001SP ACCUMULATOR FLOW TUNING ORIFICE RUPTURES 7.20E 07 ACAOR001EB 4

l

Fil : 3AATW 13. DES Crc:ted: Fri May 24 16:19:18 1996 Page 1 af 3 tength: 22787 bytes Dueued: Fri May 25 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Titics AP600 7 Filos 3AATW 13.WLK ( File created by linking atwo.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 3.3110E-09 NUMBER CUTSET PR08 PERCENT BASIC EVENT NAME EVENT PROS. IDENTIFIER 1

3.00E 09 90.61 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX XMTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 COND. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW-MAN 04C 2

8.25E 11 2.49 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 TURBINE IMPULSE PRESSURE TRANSMITTER 002 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP002RI COND. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C I

3 8.25E- !1 2.49 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX-SFTW DPERATOR FAILS TO MANUAL'Y TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 TUR81NE !MPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISSIVE) 5.23E-03 MSHTP001RI COND. PtJ8. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW MAN 04C 4

5.71E-11

1. 72 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MAN 03 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX-XMTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 5

5.2SE-11 1.59 INITIATING EVENT ATWS PdECURSOR WITH NO MFW DCCURS 4.81E-01 IEV-ATWS FAILURE OF CONTROL ROD MG SETS TO TRIP BY DAS 1.75E-03 OTH-MGSET COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3

)

6 1.00E-11

.30 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS FAILURE OF CONTROL ROD MG SETS TO TRIP BY DAS 1.75E 03 OTW-MGSET OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX-XMTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 7

7.55E-12

.23 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRES $URE ENVIRONMENT 4.78E-04 CCX-XMTR COND. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW MAN 04C 4

8 7.55E 12

.23 INITI ATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX-SFTW OPERATOR FAILS 70 MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MAN 03 COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX TRNSM COND. PROS. OF ATW-MAND 4 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW-MAND 4C 9

1.57E 12

.05 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MAN 03 TURBINE IMPULSE PRESSURE TRANSMITTER 002 (DAS TRIP PERMISSIVE) 5.23E-03 MSHTP002RI FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 10 1.57E-12

.05 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 TURBINE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISSIVE) 5.23C-03 MSHTP001RI FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 11 8.23E 13

.02 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 INSTRUMENT LINE PLUGGED (SG A) 7.22E-03 SGADR-DAS SP INSTRUMENT LINE PLUGGED (SG B) 7.22E-03 SGBOR--DAS SP COND. PROS. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW-MAN 04C 12 5.96E 13

.02 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3

File: NICK 1. DES Crested: Fri May 25 16:21:14 1996 Page 1 ef 2 Length: 14456 bytes Queued: Fri M:y 25 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1 Titts: AP600 7 Fils: NICK 1.WLK ( File created by linking nick.in WLINK2 ** Ver. 4.02 **)

Reduced Sun of Cutsets: 1.5610E 10 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

7.24E-11 46.38. INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS 2

6.24E 11 39.97 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS

.3 2.63E-12 1.68 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 Z010G001TM MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E 03 ECOM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 202DG002TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN 4

2.48E 12 f.59 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE TO START OF ENGINE-DRIVEN FUEL PUMPS 2.00E 03 Zox PD-ES MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN 5

1.78E 12 1.14 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM UNAVAILABILITY OF BUS ECS ES 2 DUE To UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY-PN 6

1.78E 12 1.14 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN 7

1.78E-12 1.14 INITIATING EVENT - STEAM GENERATOR TURE RUPTURE EVENT OCCURS

'5.20E-03 IEV SGTR i

BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN 8

1.78E 12 1.14 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS022TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN 9

1.78E-12 1.14 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SCTR COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS121TM-UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM 10 1.15E 12

.74 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZO10G001TM MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E-03 ECOM0001 DG FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E-02 202M0001 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN 11 1.15E-12

.74 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR DG FAILS TO START & RUN OR BKR 102 FAILS TO CLOSE 2.02E-02 201 MOD 01 MAIN GEN. BKR ES 01 FAILS TO DPEN [# 12) 5.08E-03 ECOM0001 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 202DG002TM CUMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN 12 9.06E 13

.58 INITI ATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR COMMON CAUSE FAILURE 4KV BREAKER TD CLOSE 7.30E-04 ECX-CB GC MAIN GEN. SKR ES 01 FAILS To OPEN [# 12) 5.08E 03 ECOM0001 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN 13 5.46E-13

.35 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF STANDBY DG TO RUN 4.40E-04 20X-DG-DR MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX-BY PN 14 5.21E 13

.33 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE 4KV BREAKERS TO OPEN 4.20E-04 ECX CB Go MAIN GEN. BCR ES 01 FAILS TO ODEN I# 12) 5.08E-03 ECOM0001

Fils: NICK 1. DES Created: Fri MIy 24 16:21:14 1996 Page 2 cf 2 Length: 14416 byt:s Queued: Fri MIy 25 17:25:02 1996 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-PN 15 4.89E 13

.31 INITI ATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.'20E 03 IEV SGTR CVS DISCHARCE LINE FAILURE 7.37E 04 cvM0004 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX-PMXM001-Sb OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS 16 4.22E-13

.27 INITIATING EVENT

STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR CVS DISCHARGE LINE FAILURE 7.37E 04 CVM0004 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 Sb FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 17 3.83E 13

.25 INITI ATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV $GTR CVS DISCHARGE LINE FAILURE

7. 37E- 04 CVM0004 COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP-SAM DPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS 18 3.30E 13

.21 INITIATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR CVS DISCHARGE LINE FAILURE 7.37E-04 CVM0004 COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP-SAM FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 19 3.17E-13

.20 INITIATING EVENT

STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001-Sb 20 2.73E 13

.17 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 FA! LURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF PMS ESF DUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 54 21 2.49E 13

.16 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03

!EV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.7BE 04 CCX-XMTR195 OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX-EP-SAM 22 2.14E-13

.14 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT DCCURS 5.20E-03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX-EP-SAM 23 1.47E 13

.09 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR CVS SUCT!DN FOM BORIC ACID TANK FAILURE 2.21E-04 CVMOD01 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMXM001 Sb OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC-MANDAS 24 1.26E-13

.08 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR CVS SUCT10N FOM BORIC ACID TANK FAILURE 2.21E 04 CVM0001 COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX-PMXM001-SW FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 25 1.15E-13

.07 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR CVS SUCTION FOM BORIC ACID TANK FAILURE 2.21E 04 CVM0001 COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E 06 CCX EP-SAM OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC-MANDAS

n

+

FitC: NICK 2.0ES Creted: Fri May 25 16:21:22 1996 Page 1 of 2 Length: 11529 bytes cueued: Fri May 25 17:25:02 1996

- - - - DOMINANT CUTSETS * *

Page:

1

Title:

AP600 7 File NICK 2.WLK ( Fite created by linking nick.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 9.3260E 12 WUMBER CUTSET PROB PERCENT BASIC EVENT NAME EVENT PROB. IDENTIFIER 1

1.05E 12 11.26 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX XMTR195 MARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 1.41E-02 RN11M003 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E 05 IWX CV-A0 2

1.05E-12 11.26 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX XMTR195 HARDWARE FAILURE OF N RNR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E-02 RN22M004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX-CV A0 3

1.0$E-12 11.26 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-$GTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX-CV-A0 4

9.11E 13 9.77 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FA! LURE OF PZR LEVEL SENSORS 4.78E 04 CCX-XMTR195 HARDWARE FAILURE OF NORMAL RHR !$0LAT10N MOV 011 1.41E-02 RN11M003 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQU!B VALVES 2.60E-05 IWX EV-SA 2

5 9.11E 13 9.77 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN224004 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQU!B VALVES 2.60E 05 IWX EV-SA 6

9.11E-13 9.77 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 i

HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E 02 RN23 MOD 5 COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV-SA 7

4.21E 13 4.51 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE' EVENT OCCURS 5.20E-03 IEV-SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX XMTR195 HARDWARE FAILURE OF NORMAL RHR !$0LATION MOV 011 1.41E-02 RN11M003 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX FL-GP 0

4.21E-13 4.51 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR 4.78E 04 CCX-XMTR195 COMMON CAUSE FAILURE OF PZR LEVEL SENSORS HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF STRA!NERS IN 1RWST TANK 1.20E-05 IWX-FL-CP 9

4.21E 13 4.51 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR I

COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 HARDWARE FAILURE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF STRAINERS IN IRWST TANK 1.20E-05 IWX FL-GP 4

10 3.65E 13 3.91 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E-03 RNX KV1-GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E 05 IWX-CV-A0 11 3.17E 13 3.40 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV $GTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX XMTR195 COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E 03 RNX KV1 GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E-05 IWX EV-SA 12 2.16E-13 2.32 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E-03 RHN MAN 01 COMMON CAUSE FAILURE OF 4 1RWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 13 1.92E 13 2.06 INIT!ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03

!EV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 HARDWARE FAILURE OF N RHR VALVES ON DV! LINE A (V 015A & 017A) 5.07E-02 RNAM0009 HARDWARE FA! LURE OF N RNR VALVES ON DV! LINE B (V 0158 & 0178) 5.07E 02 RNBM0010 COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 16 1,87E 13 2.01 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX XMTR195 OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E 03 RHN MAN 01

FilO NICK 2.0ES Creoged: Frl May 26 16:29:32 1996 Page 2 of 2 Length: 11529 bytes Queued: Fri May 26 17:25:02 1996 COMMON CAUSE FAILURE OF 4 IRWST 1NJECTION SQUIB VALVES 2.60E-05 IWX EV SA 15 1.87E 13 2.01 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV-A0 16 1.66E 13 1.78 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS

4. 78E-04 CCX XMTR195 HARDWARE FAILURE OF N RHR VALVES ON DVI LINE A (V 015A & 017A) 5.07E 02 RNAM0009 HARDWARE FAILURE OF N RHR VALVES ON DV! LINE B (V 0158 & 017B) 5.0TE 02 RNBM0010 COMMON CAUSE FAILURE OF 4 IRWST INJECT!DN SOU!B VALVES 2.60E 05 IWX EV SA 1F 1.62E*13 1.74 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV $GTR COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUlB VALVES 2.60E 05 IWX EV-SA 10 1.46E 13 1,57 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSOR $

4.78E 04 CCX XMTR195 COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/8 TO OPEN 4.90E-03 RNX KV1-GO COMMON CAUSE FAILURE OF STRA!NERS IN IRWST TANK 1.20E 05

!WX FL*GP 19 1.30E 13 1.39 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX XMTR195 N RHR CHECK WALVE V013 FAILURE TO DPEN 1.75E 03 RNNCV013GO COMMON CAUSE FAILURE OF 4 IRWST INJECTION CHECK VALVES 3.00E-05 IWX CV A0 20 1.13E 13 1.21 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03

!EV SGTR 4

COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E 04 CCX-XMTR195 N RHR CHECK VALVE V013 FAILURE TO OPEN 1.75E 03 RNNCv013Go l

COMMON CAUSE FAILURE OF 4 IRWST INJECTION SQUl8 VALVES 2.60E-05

!WX-EV SA a

l i

i

Fils: 3AATW 13. DES Cr:cted: Fri Key 24 16:19:18 1996 PsBe 2 of 3 LenBth: 22787 bytes Queued: Fri May 25 17:25:02 1996 INSTRUMENT LINE PLUGGED (SG A) 7.22E 03 SGADR -DAS SP SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGBTL-DAS-UF COND. PROB. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW MAN 04C 13 5.96E 13

.02 INITIATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS 1

COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL -DAS-UF i

I INSTRUMENT LINE PLUGGED (SG B) 7.22E 03 SGBOR-DAS SP CONO. PROB. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C 14 4.32E 13

.01 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL -DAS-UF SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E-03 SGBTL DAS-UF COND. PROB. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C 1

15 3.31E 13

.01 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW OPERATOR FAILS 70 MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MAN 03 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E 04 ED3 MOD 01 STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 16 2.19E 13

.01 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 BATTERY DB1 UNAVAILABLE 2.70E 03 ED3M0003 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM 17 1.97E 13

.01 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 BUS EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSDS1TM 18 1.43E-13

.00 INITI ATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.7BE 04 CCX-XMTR FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 19 1.43E 13

.00 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 4

COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX-TRNSM FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 20 4.63E 14

.00 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS l

COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB-FA COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.7BE-04 CCX XMTR OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW-MAN 04 COMMON CAUSE FAILURE OF PZR LEVEL SENSORS 4.78E-04 CCX-XMTR195 21 4.08E-14

.00 INITI ATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCMCDUL MAINTENANCE 2.70E-03 EC18$001TM 22 4.08E 14

.00 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC1BS011TM 23 4.08E 14

'. 00 INITIATING EVENT - ATWS PRECURSOR WiTH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX SFTN OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E 04 ED3 MOD 01 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC1BS111TM 24 2.43E 14

.00 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW i

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MAN 03 BUS EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSDS1TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM i

~.

File: 3AATW 13. DES Cre:ted: Fri May 24 16:19:18 1996 Page 3 of 3 Length: 22787 bytes Queued: Fri May 24 17:25:02 1996 25 2.43E 14

.00 INITIATING EVENT ATWS PRECURSOR WnTH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX $FTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 BUS EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSDS1TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS011TM 26 2.43E 14

.00 INITIATING EVENT ATWS FRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 BUS E053 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E 4'>

ED3BS0$1TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS111TM 27 1.89E 14

.00 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 BATTERY DB1 UNAVAILABLE 2.70E-03 ED3 MOD 03 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 ZOIDG001TM MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E-03 ECOM0001 28 1.18E 14

.00 INITIATING EVENT

ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWAPE 1.20E-06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF NON CLASS 1E INVERTERS 2.40E 05 CCX IV-XR1 STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 29 1.56E 14

.00 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 INSTRUMENT LINE PLUGGED (SG A) 7.22E-03 SGAOR -DAS SP INSTRUMENT LINE PLUGGED (SG B) 7.22E 03 SGBOR -DAS-SP FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 30 1.13E-14

.00 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX $FTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 INSTRUMENT LINE PLUGGED (fG A) 7.22E 03 SGADR -DAS SP SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E-03 SGBTL-DAS UF FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS 31 1.13E-14

.00 INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E 06 CCX-SFTW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL-DAS UF INSTRUMENT LINE PLUGGED (SG B) 7.22E 03 SGBOR DAS SP FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS l

Files 3AATW 28. DES Crzted: Fri May 24 11:19:30 1996 Page 1 cf 10- Length: 87'.52 byt:s Queued: Fri May 24 17:25:02 1996

"*" DOMI NANT CUTSETS *****

Page 1

Titto: AP600 7 File 3AATW 28.WLK ( File created by linking etws.in WLINK2 ** Ver. 4.02 **)

Reduced Sum of Cutsets: 5.4040E-09 NUMSER CUTSET PROS PERCENT SAslC EVENT NAME EVENT PROS. IDENTIFIER 1

1.76E 09 32.57 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX-PMS HARDWAr CPERATOR FAILS To MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS COND. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL R00 5.17E 01 ATW-MAN 01C 1

2 9.18E 10 16.99 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH No MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS HARDWA OPERATOR FAILS 70 MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MAN 03 TURBINE IMPULSE PRESSURE TRANSMITTER 002 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP002RI CONO. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C CONO. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL Rao 5.17E-01 ATW-MAN 01C 3

9.18E-10 16.99 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.2TE 01 OTH PRESU INITIATING FVENT ATWS PRECURSGR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX-PMS MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 TUR8tPE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMIS$1VE) 5.23E 03 MSHTP001R1 CONO. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW-MAN 04C COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E-01 ATW-MAN 01C 4

5.84E 10 10.81 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS FAILURE OF CONTROL R00 MG SETS TO TRIP BY DAS 1.75E 03 OTH MGSET COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS-HARDWA OPERATOR FAILS To MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 CONO. PROS. OF ATW-MAN 01 (OPER. FAILS To STEP IN CONTROL ROD 5.17E 01 ATW-MAN 01C 5

3.43E 10 6.35 FAILURE OF PRS RELIEF FOR Loss OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RS FA FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW MAN 04 CONO. PROS OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E-01 ATW-MAN 01C

'6 1.79E-10 3.31 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.2TE 01 OTH-PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA TURBINE IMPULSE PRES $URE TRA;fSMITTER 002 (DAS TRIP PERMIS$1VE) 5.23E 03 MSHTP002RI OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW-MAN 04 COND. PR06. OF ATW-MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E-01 ATW-MAN 01C 7

1.79E 10 3.31 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTM-PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB-FA TUR81NE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP001RI OPERATOR FAILS To MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW MAN 04 COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E 01 ATW-MAN 01C 8

1.02E 10 1.89 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.61E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARDW/

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E-04 ED3M0007 COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E-01 ATW-MAN 01C 9

8.38E 11 1.55 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH No MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX-PMS HARDWI OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR COND. PROB. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW-MAN 04C COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL, R00 5.17E-01 ATW MAN 01C 10 8.38E 11 1.55 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTN PRESU INITIATING EVENT ATWS PRECUR$0R WITH NO MFW OCCURS 4.81E-01 LEV ATWS

. ~.

Fils: 3AATW 28. DES Crected: Fri M y 25 16:19:30 1996 Page 2 of 10 Len8th: 87452 bytes cueued: Fri May 24 17:25:02 1996 COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARDW/

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF SENSOR $ IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX-TRNSM CONO. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW-MAN 04C CONO. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E 01 ATW-MAN 01C 11 7.36E 11 1.36 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS FAILURE OF CONTROL ROD MG SETS TO TRIP BY DAS 1.75E 03 OTH MGSET COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA OPERATOR FAILS TO STEP !N THE CONTROL ROOS 3.30E 02 ATW MAN 01 12 3.34E-11

.62 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU l NIT!ATING EVENT ATWS PRECURSOR WITH NO MFW OCCUR $'

4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX-PMS MARDW/

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COND PROS. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL R00 5.17E 01 ATW MAN 01C 13 1.74E-11

.32 FAILURE OF PR$ RELIEF FOR LOS$ OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS HARDW/

3 OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 TURBINE IMPULSE PRESSURE TRANSMITTER 002 (DAS TRIP PERMISS!VE)

5. 23E -03 MSHTP002RI FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COND. PROB. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E-01 ATW MAN 01C 14 1.74E 11

.32 FAILURE OF PR$ RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX-PMS MARDW; OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MAN 03 TURBINE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMIS$1VE)

5. 23E-03 MSHTP001RI FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COND. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E 01 ATW MAN 01C 15 1.64E-11

.30 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH No MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS-8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT

4. 78E- 04 CCX XMTR OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW MAN 04 COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E-01 ATW MAN 01C 16 1.64E 11

.30 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 4.81E-01 IEV ATWS INITIATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 8.10E 06 RCX RB-FA COMMON CAUSE FAILURE OF SENSOR $ IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX-TRNSM OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW-MAN 04 COND. PROB. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E-01 ATW MAN 01C 17 1.28E 11

.24 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH No MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.0$E-04 ED3M0007 OPERATOR FAILS TO STEP IN THE CONTROL ROOS 3.30E 02 ATW-MAN 01 18 9.14E 12

.17 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS MARDW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 INSTRUMENT LINE PLUGGEO (SG A) 7.22E-03 SGAOR -DAS SP

!NSTRUMENT LINE PLUGGED (SG B) 7.22E 03 SGBOR -DAS SP COND. PR08. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C CONO. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E-01 ATW MAN 01C 19 6.62E-12

.12 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS MARD6 OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 INSTRUMENT LINE PLUGGED (SG A) 7.22E 03 SGADR DAS SP SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E-03 SGBTL -DAS UF COND. PROS. OF ATW MAN 04 (OPER. FA!LS TO TRIP REACTOR) 5.26E 01 ATW-MAN 04C COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E 01 ATW-MAN 01C 20 6.62E-12

.12 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX-PMS-HARDb OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3

File: 3AATW 28. DES Crotted: Fri May 24 16:19:30 1996 Page 3 af 10 Length: 87'52 bytes oueued: Fri M:y 2517:25:021996 SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL -DAS UF INSTRUMENT LINE PLUGGED (SG 8) 7.22E-03 SG80R -DAS SP COND. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW-MAN 04C CONO. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP *lN CONTRot Roo 5.17E-01 ATW MAN 01C 21 4.80E 12

.09 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL -DAS UF SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SG8TL--DAS UF COND. PROS. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C COND. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E 01 ATW MAN 01C 22 4.20E 12

.08 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA FAILURE OF AUTOMATIC DAS FUNCTION 1.00E-02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO STEP IN THE CONTROL ROOS 3.30E 02 ATW-MAN 01 23 3.68E 12

.07 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E*01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001 i

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 f

COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL R00 5.1TE 01 ATW-MAN 01C 24 2.43E 12

.04 FAILURE OF PAS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS HARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 BATTERY D81 UNAVAILABLE 2.70E-03 ED3M0003

)

UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM CONO. PRO 8. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E 01 ATW-MAN 01C 25 2.24E 12

.04 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 i

FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS CONO. PROS. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW-MAN 04C FAILURE OF R00 CONTROL SYSTEM TO STEP IN RODS 6.60E-04 ROO-CTRL-SYS i

26 2.20E 12

.04 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.2TE 01 OTH-PRESU j

INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA 4

TURBINE IMPULSE PRESSURE TRANSMITTER 002 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP002RI FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E 02 ATW-MAN 01 27 2.20E-12

.04 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB-FA TURBINE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PEkMISSIVE) 5.23E-03 MSHTP001RI FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW MAN 01 28 2.19E-12

.04 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.895 05 CCX-PMS MARDWI J

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 I

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 l

BUS EDS3 DS 1 UNAVAILABLE DOE TO CORRECTIVE MAINTENANCE 3.00E 04 ED3BSDS1TM COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E-01 ATW-MAN 01C 29 1.79E-12

.03 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTM PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA INSTRUMENT LINE PLUGGED (SG A) 7.22E 03 SGAOR -DAS SP INSTRUMENT LINE PLUGGED (SG B) 7.22E-03 SGBOR--DAS SP OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW-MAN 04 CONO. PROS. OF ATW-MAN 01-(DPER. FAILS TO STEP-IN CONTROL R00 5.17E 01 ATW MAN 01C

)

30 1.60E 12

.03 FAILURE OF PR$ RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITI ATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS-MARDW.

l 1

Files 3AATW 28. DES Cracted: Fri May 25 16:19:30 1996 Page 4 of 10 Length: 87452 bytte oueued: Fri M:y 2417:25:021996 OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCX xMTR FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COND. PROS. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E-01 ATW MAN 01C 31 1.60E 12

.03 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E*05 CCX PMS MARDW, OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX TRNSM FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COND. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E 01 ATW MAN 01C 32 1.47E-12

.03 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH No MFW OCCURS 4.81E 01 IEV ATWS FAILURE OF CONTROL ROD MG SETS TO TRIP BY DAS 1.75E-03 OTH MGSET COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E 04 ROD CTRL-SYS 1

33 1.29E 12

.02 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH No MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RS FA INSTRUMENT LINE PLUGGED (SG A) 7.22E-03 SGAOR DAS SP SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SG8TL -DAS-UF OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW MAN 04 COND. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E 01 ATW-MAN 01C 35 1.29E 12

.02 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTM PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RS FA SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL -DAS-UF l

INSTRUMENT LINE PLUGGED (SG B) 7.22E 03 SGe0R -DAS SP OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW MAN 04 COND. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP IN CONTROL ROD 5.17E-01 ATW-MAN 01C i

35 1.17E 12

.02 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU j

INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIF SYSTEM HARDWAdE 7.89E-05 CCX PMS MARDW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MAN 03 TURBINE IMPULSE PRESSURE TRANSMITTER 002 (DAS TRIP PERMIS$1VE) 5.23E-03 MSHTP002RI COND. PROS. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW-MAN 04C FA! LURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E 04 ROD CTRL-SYS i

36 1.17E 12

.02 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS l

CapWON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS*HARDW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 TURelNE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP001RI COND. PROB. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E 01 ATW MAN 04C FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E-04 ROD CTRL-SYS

]

37 9.37E-13

.02 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WI'TH UET 3.27E-01 OTH PRESU

}

INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RS FA l

SG A WR WATER LEVEL TRANSMITTER FAILURE 5.23E 03 SGATL*-DAS UF SG B WR WATER LEVEL TRANSMITTER FAILURE 5.23E*03 SGBTL DAS-UF j

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW MAN 04 COND. PROB. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E 01 ATW MAN 01C 38 7.45E 13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS FAILURE OF CONTROL ROD MG SETS TO TRIP BY DAS 1.75E 03 OTH-MGSET COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS-HARDb i

i OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 1

FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E 04 ROD CTRL SYS l

39 4.64E 13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITI ATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA

]

4 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E 04 ED3M0001 l

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW MAN 01 40 4.54E-13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARD6 OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 i

FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001

File: 3AATW 28. DES Cracted: Fri May 24 16:19:30 1996 Page 5 cf 10 Length: 87452 bytes Oueved: Fri May 25 17:25:02 1996 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E 01 ATW-MAN 01C 41 4.54E 13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITI ATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATVS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS HARDWA DPERATOR FAILS TO MANUAL'.Y TRIP REACTOR VI A PMS 5.20E-02 ATW-MANO3 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STAfic XFER SW 5.04E 04 ED3M0001 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E 01 ATW-MAN 01C 42 4.54E 13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS-MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-Cf ATW MANO3 FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS111TM COND. PROB. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTROL R00 5.17E 01 ATW-MAN 01C 43 4.37E-13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA FAILURE OF AUTOMAfic DAS FUNCTION 1.00E 02 DAS OPERATOR FAILS TO MANUALLY TRIP REACTOR VI A DAS 5.20E 02 ATW-MAN 04 FAILURE OF ROD CONTROL SYSTEM TO STEP IN ROOS 6.60E 04 ROD CTRL SYS 44 3'.69E-13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 31 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF NON-CLASS 1E BATTERIES 5.70E 05 CCX BY PN1 MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12) 5.08E-03 ECOM0001 45 3.06E-13

.01 FAILURE OF PR$ RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCJRS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA BATTERY DB1 UNAVAILABLE 2.70E 03 ED3M0001 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM OPERATOR FAILS TO STEP IN THE CONTROL RODS

.3.30E-02 ATW-MAN 01 46 2.76E 13

.01 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RS FA STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 BUS EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSD$1TM OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW MAN 01 47 2.69E-13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX-PMS-HARDWAR,

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 l

BUS EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSDS1TM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E-01 ATW MAN 0fC 48 2.69E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS-MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 BUS EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED3BSDSITM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E-01 ATW MAN 01C 49 2.69E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS-HARD6D OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 BUS EDS3 DS 1 UNAVAILABLE DUE To CORRECTIVE MAINTENANCE 3.00E-04 ED3BSOS1TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS111TM COND. PROS. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E 01 ATW MAN 01C 50 2.56E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITI ATING EVENT ATWS PRECUR$0R WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX-RB FA EDS3 EA 1 DISTR. PANEL FAILURE OR T&M (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3 MOD 07 FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60c-04 ROO-CTRL-SYS f

51 2.29E-13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTM PRESU INITIATING EVENT - ATWS PRECURROR WITH NO MFW OCCURS 4.81E 01 IEV ATWS i

File: 3AATU 28. DES Cr cted: Fri May 24 16:19:30 1996 Page 6 of 10 Length: 87452 bytes Queued: Fri May 24 17:25:02 1996 COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB-FA 4

TURBINE IMPULSE PRESSURE TRANSHITTER 002 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP002RI OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW MAN 04 FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E-04 ROD-CTRL-SYS 52 2.29E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU INITIATING EVENT ATWS'PRECUR$0R WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX-RB FA TURBINE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISS!VE) 5.23E 03 MSHTP001RI OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW MAN 04 FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E 04 ROD CTRL SYS 53 2.10E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS HARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MAN 03 BATT2RY 081 UNAVAILABLE 2.70E 03 ED3 MOD 03 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 2010G001TM MAIN GEN. DKR ES 01 FAILS TO OPEN [# 12) 5.0BE 03 ECOMOD01 COND. PROB. OF ATW MAN 01 (OPER. FAILS TO STEP IN CONTROL R00 5.17E-01 ATW MAN 01C 3.27E 01 OTH*PRESU 54 2.01E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS

~

4.81E 01 IEV-ATWS INITIATING EVENT - ATWS PRECURSOR WITH No MFW OCCURS 8.10E-06 RCX-RB FA COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.7BE 04 CCX XMTR FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW-MAN 01 55 2.01E-13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.2TE 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF SENSOR $ IN LOW PRESSURE ENVIRONMENT 4.7BE 04 CCX-TRNSM FAILURE OF HANUAL DAS HARDWARE 1.00E 02 MDAS DPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E 02 ATW MAN 01 56 1.96E-13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E-05 CCX BY PN1 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM 57 1.96E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITI ATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX-RB FA COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E-05 CCX BY-PN1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC2BS023fM 5'8 1.96E-13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU IN!TI ATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E-05 CCX BY PN1 UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM 59 1.87E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTM PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS-MARDW/

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF NON-CLASS 1E BAiTERIES 5.70E-05 CCX BY-PN1 MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12]

5.08E-03 ECOM0001 60

1. 75E-13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX-PMS MARDW, OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF NON CLASS 1E INVERTERS 2.40E-05 CCX-IV XR1

]

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E-02 ED3M0004 COND. PROB. OF ATW-MAN 01 (OPER. FAILS TO STEP-IN CONTROL ROD 5.17E-01 ATW-MAN 01C 61 1.74E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS-HARDW OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 INSTRUMENT LINE PLUGGED (SG A) 7.22E-03 SGAOR--DAS SP INSTRUMENT LINE PLUGGED (SG B) 7.22E-03 SGBOR--DAS SP FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COND. PROB. OF ATW MAN 01 (OPER. FAILS TO STEP-IN CONTRot R00 5.17E-01 ATW-MAN 01C

{

62 1.30E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATVS, WITH UET 3.27E-01 0,TH-PRESU

Filos 3AATW 28. DES Croated: Fri May 24 16:99:30 1996 Page F of 10 Leng2h: 87652 bytos Queued: Fri May 26 17:35:02 1996 INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS HARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 EDS3 EA 1 distr. PANEL FAILURE OR TLM (DAS/PLS CABINET SUPPLY) 3.05E 04 ED3M0007 FAILURE OF ROD CONTROL SYSTEM TO STEP IN ROOS 6.60E-04 ROD CTRL-SYS 63 1.07E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS CGAMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM KARDWARE 7.89E 05 CCX-PMS-HARDWA 4

OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN HIGH ?RES$URE ENVIRONMENT 4.78E-04 CCX XMTR COND. PROB. OF ATW-MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW MAN 04C FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E-04 ROD CTRL SYS 64 1.07E 13

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS 1

COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX-PMS HARDhm i OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX TRNSM i

COND. PROB. OF ATW MAN 04 (OPER. FAILS TO TRIP REACTOR) 5.26E-01 ATW-MAN 04C FAILURE OF ROD CONTROL SYSTEM TO STEP IN RUDS 6.60E 04 ROD-CTRL SYS 65 9.93E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS MARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E 05 CCX BY PN1 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 66 9.93E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVEhT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS HARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E 05 CCX BY-PN1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS023TM 67 9.93E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEN HARDWARE 7.89E 05 CCX PMS HARD6W OPERATOR FAILS TO MANUALLY TRIP REACTOR v!A PMS 5.20E-02 ATW MANO3 COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E-05 CCX-BY PN1 UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM 68 8.41E-14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RB FA FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS FAILURE OF R00 CONTROL SYSTEM TO STEP IN ROOS 6.60E 04 ROD-CTRL-SYS 69 8.26E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF NON CLASS 1E INVERTERS 2.40E-05 CCX IV XR1 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 70 8.26E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RG FA COMMON CAUSE FAILURE OF NON CLASS 1E INVERTERS 2.40E 05 CCX-IV XR1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM F1 8.26E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF NON-CLASS 1E INVERTERS 2.40E-05 CCX IV-XR1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS111TM 72

5. 72E-14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB-FA FIXED COMPONENT FAILS: CKT BKR, INVERTER, OR STATIC XFER SW 5.04E-04 ED3M0001 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW MAN 01 73 5.72E-14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITI ATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01

!EV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA

Files 3AATW-28. DES Created: Fr6 nay 24 15:19:30 1996 Page 8 of 10 Length: 87452 bytes Queued: Fri May 24 17:25:02 1996 FIXED. COMPONENT FAILS: CET BKR, INVERTER, OR STATIC XFER SW-5.04E 04 ED3M0001 SUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC18$011TM OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E 02 AtW MAN 01

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW AfWS, WITH UET 3.27E -01 OTH-PRESU 74 5.72E 14 1

INITIAflNG EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB-FA FIXED COMPONENT FAILS: CKT 8KRi INVERTER, OR STATIC XFER SW 5.04E 04 ED3 MOD 01 BUS UNAVAILA8tE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC18S111TM OPERATOR FAILS to STEP !N THE CONTROL RODS 3.30E 02 ATW-MAN 01 75 4.72E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSDR WITH NO MFW OCCURS 4.81E-01 LEV ATWS i

COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA I

BATTERY D81 UNAVAILABLE 2.70E-03 ED3M0003 MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12]

5.08E 03 ECOMOD01 BATTERY 081 UNAVAILABLE 2.70E-03 ED1 MOD 03 76 4.40E-14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 LEV ATWS I

COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB-FA TURBINE ' IMPULSE PRESSURE TRANSMITTER 002.(DAS TRIP PERMISSIVE) 5.23E 03 MSHTP002RI FAILURE OF MANUAL DAS HARDWARE 1.00E 02 NOAS FAILURE OF ROD CONTROL SYSTEM 70 STEP IN ROOS 6.60E 04 ROD CTRL SYS 77 4.40E-14

.00 FAILURE OF PR$ RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITI ATING EVENT - ATWS PRECURSOR WifH NO MFW DCCURS 4.81E-01 LEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RS FA DJRBINE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISSIVE) 5.23E-03 MSHTP001R1 FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS FAILURE OF ROD CONTROL SYSTEM TO STEP IN ROOS 6.60E-04 ROD-CTRL SYS i

4 3

78 4.26E-14 i

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS-MARDWAR OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 E

FAILURE OF AUTOMATIC DAS FUNCTION 1.00E 02 DAS FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS FAILURE OF R00 CONTROL SYSTEM TO STEP IN RODS 6.60E-04 ROO CTRL-SYS 79 4.18E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS MARDWAR OPERATOR FAILS 10 MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW-MANO3 COMMON CAUSE FAILURE OF NON-CLASS 1E INVERTERS 2.40E 05 CCX-IV-XR1 UNAVAILABILliY 0F BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 80 4.18E-14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIAf!NG EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS HARDWA :i OPERATOR FAILS TO MANUALLY TRIP REACTOR VI A PMS 5.20E 02 ATW MANO3 COMMON CAUSE FAILURE OF NON CLASS 1E INVERTERS 2.40E-05 CCX-IV XR1-i SUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM j

81 4.18E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.2 7E-01 OTH PRESU IN!f!Af!NG EVENT - ATWS PRECURSOR WITH NO MFW DCCURS 4.81E 01 LEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX-PMS HARDWA OPERATOR FAILS TO MANUALLY TRIP REACTOR vlA PMS 5.20E-02 ATW-MANO3 COMMON CAUSE FAILURE OF NON-CLASS 1E INVERTERS 2.40E 05 CCX IV XR1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS111TM 82 3.41E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WifM UET 3.27E-01 OTH PRESU IN!' SATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS CCAMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RS-FA 6US EDS3 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 F03BSDSITM UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM OPERAf0R FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW MAN 01 83 3.41E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UEt 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 LEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA SUS EDS3 DS.1 UNAVAILA8LE DUE TO CORRECTIVE MAINTENANCE 3.00E- 04 E03BSDS1TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM OPERATOR FAILS TO STEP IN THE CONTROL RODS.

3.30E-02.

ATW MANOT 34' 3.A1E-14'

.30' FAILURE.0F PRS RELIEF,FOR LOSS OF1MFW ATWS, WITN UET.

3.2 7E- 01 OTH-PREsu INITI ATING EVENT ATWS PRECURSOR WITH NO MrW OCCutt e.81E-01

!EV-ATWS COMMON CAUSE TAILURE OF<REAC10R TRIP BREAKERS )

S.10E-36 RCX-R9-FA

File: 3AATW 28. DES Created: Fri s'ey 24 16:19:30 1996 Page 9 of 10 Length: 87452 bytes Queued: Fri May 24 17:25:02 1996 BUS EDS3 05 1 UNAVAILABLE DUE To CORRECTIVE MAlWTENANCE 3.'00E 04.

E03BSDS1TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS111TM GPERATOR FALLS TO STEP ]W THE CONTROL RODS 3.30E-02 ATW MAN 01 85 3.06E 14i 00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 LEV ATWS -

FA! LURE OF CONTROL ROD MG SETS TO TRlP BY DAS

1. 75 E-03 OTH MGSE1 COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB-FA BATTERY 081 UNAVAILABLE 2.70E-03 ED1M0003 -

MAIN GEN. SKR ES 01 FAILS TO OPEN [# 12]

5.08E-03 ECOM0001 86 2.65E*14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 LEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX-RG-FA I

BATTERY DB1 UNAVAILABLE 2.70E 03 E03M0003 STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02 201DG001TM MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12]

5.08E 03 ECOM0001 OPERATOR FAILS TO STEP lN THE CONTROL RODS 3.30E 02 ATW MAN 01 87 2.51E-14

.00, FAILURE OF PRS RELIEF FOR LOS$ OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA BATTERY DB1 UNAVAILABLE 2.70E 03 ED3M0003 UNAVAILABILITY OF BUS ECS ES 1 DUF. TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM BATTERY 081 UNAVAILABLE 2.70E 03 E01M0003 88 2.39E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 1EV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX-PMS MARDWAR OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E-02 ATW-MANO3 BATTERY 081 UNAVAILABLE 2.70E 03 E03M0003 MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12]

5.08E-03 ECOM0001 l

BATTERY 091 UNAVAILABLE 2.70E 03 E01M0003 89 2.30E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH No MFW OCCURS 4.81E-01 LEV ATWS l

COMMON CAUSE FAILURE OF REACTOR TRIP RREAKERS 8.10E 06 RCX RB FA COMMON CAUSE FAILURE OF NON CLASS 1E BATTERIES 5.70E 05 CCX BY PNI FlXED COMPONENTS FAILURE 3.17E-04 E04M00112 90 2.30E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB*FA COMMON CAUSE FAILURE OF NON-CLASS 1E BATTERIES 5.70E 05 CCX BY PN1 FIXED COMPONENTS FAILURE 3.17E 04 ED4M0011 91 2.23E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH-PRESU INITIATING EVENT ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E 05 CCX PMS HARDWAR OPERATOR FAILS 70 MANUALLY TRIP REACfDR V!A PMS 5.20E-02 ATW MANO3 i

TURBlNE IMPULSE PRESSURE TRANSMtTTER 002 (DAS TRIP PERMIS$1VE) 5.23E-03 MSHTP002Rt FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS FAILURE OF ROD CONTROL SYSTEM TO STEP IN ROOS 6.60E-04 ROD-CTRL SYS 92 2.23E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV-ATWS COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS-MARDWAR OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA PMS 5.20E 02 ATW MANO3 TURBlNE IMPULSE PRESSURE TRANSMITTER 001 (DAS TRIP PERMISSIVE) 5.23E 03 MSHTP001RI FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS FAILURE OF ROD CONTROL SYSTEM TO STEP IN RODS 6.60E-04 ROD CTRL-SYS 93 2.21E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E-01 OTH PRESU INITIATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E 01 LEV-ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E-06 RCX RB FA COMMON CAUSE FAILURE OF NON CLASS 1E INVERTERS 2.40E-05 CCX tV-xR1 j

STATIC TRANSFER SWITCH FAILS TO TRANSFER OR BKR FAILS OPEN 2.19E 02 ED3M0004 OPERATOR FAILS TO STEP IN THE CONTROL RODS 3.30E-02 ATW-MAN 01 94 2.19E 14-

.30 FAILURE OF. PRS REttEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH-PRESU INtil ATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS.

4.81E 01 IEV-ATWS CJMMON CAUSE FAILURE- 0F REACTOR TRIP BREAKERS S.10E 06 RCX RB FA INSTRUMENT LINE PLUGGED (SG A) 7.22E-03 SGAOR -DAS SP l

!NSTRUMENT LINE PLUGGED (SG B)

' 22E-03 SG80R - DAS-SP FAILURE OF MANUAL DAS HARDWARE T.00E-02 40AS OPERATOR FAILS TO STER IN THE CONTROL RODS 3.30E-02 ATW MANO) i f-95 2.18E-14

.30 FALLURE OF PRS RELIEF E0e LOSS OF MFW ATWS, WITH UET 3.27E-01 JT + PRESU

File: 3AATW-28. DES Crested: Fri MIy 24 16:19:30 1996

)

Page 10 of 10 Length: 87452 bytes Queued: -Fri May 24 17:25:02 1996 INifl ATING EVENT - AfWS PRECURSOR WITH NO MFW OCCURS '

4.81E 01 IEV-ATWS-COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS S.10E 06 RCX RB FA COMMON CAUSE FAILURE OF NON CLASS 1E BAffERIES 5.70E 05 CCX BY PN1 BUS EDS4 DS 1 UNAVAILABLE QUE TO CORRECTIVE MAINTENAhCE 3.00E ED4GSDSITM 96 2.15E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF. MFW ATWS, WITH UEt 3.27E 01 OTH PRESU.

INITIAi!NG EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 IEV ATWS FAILURE OF CONTROL R00 M0 SETS TO TRIP BY DAS

1. 75 E -03 OTH-MGSET-COMMON CAUSE FAILURE OF PMS REACTOR TRIP SYSTEM HARDWARE 7.89E-05 CCX PMS HARDWAR FAILURE OF PMS REACTOR TRIP SWlTCHES 3.00E-05 PMS RTSWITCH OPERATOR FAILS TO STEP IN IME CONTROL RODS 3.30E 02 ATW MAN 01 97 2.09E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INIf!Ai!NG EVENT ATWS PRECURSOR WlfH NO MFW OCCURS 4.81E 01 IEV ATWS COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E 04 CCX XMTR OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E 02 ATW MAN 04 FAILURE OF ROD CONTROL SYSTEM TO STEP !N ROOS 6.60E 04 ROO-CTRL SYS 98 2.09E 14

.30 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WifH UET 3.27E 01 OTH PRESU 4.81E 01 IEV-ATWS.

INITI ATING EVENT - ATWS PRECURSOR WifH NO MFW DCCURS 8.10E 06 RCX RB FA COMMON'CAUSE FAILURE OFsREACTOR TRIP BREAKERS COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX TRNSM OPERATOR FAILS TO MANUALLY TRIP REACTOR VIA DAS 5.20E-02 ATW MAN 04 FAILURE OF ROD CONTROL SYSTEM TO STEP IN R005 6.60E-04 ROO CTRL-SYS 99 1.63E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WifH UET 3.27E 01 OTH-PRESU INITIAflNG EVENT ATWS PRECURSOR WlfH NO MFW OCCURS 4.81E 01 IEV ATWS FAILURE OF CONTROL ROD MG SETS TO TRIP BY DAS 1.75E 03 OTH MGSET COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA BATTERY 081 UNAVAILABLE 2.70E-03 ED1M0003 UNAVAILABILITY OF BUS ECS ES 1 DUE To UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM i

100 1.63E 14

.00 FAILURE OF PRS RELIEF FOR LOSS OF MFW ATWS, WITH UET 3.27E 01 OTH PRESU INifl ATING EVENT - ATWS PRECURSOR WITH NO MFW OCCURS 4.81E-01 1EV ATWS FAILURE OF CONTROL R00 MG SETS TO TRIP BY DAS 1.75E 03 ofH-MGSET COMMON CAUSE FAILURE OF REACTOR TRIP BREAKERS 8.10E 06 RCX RB FA BATTERY DB1 UNAVAILABLE 2.70E 03 ED1M0003 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS011TM I

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- File 3Cava 02.0ES; Created: Fri ney 24 10:19:361996 c Page 1 of 1-Length: 670' bytes, Queued: Fri May 26.1P:25:02.1996~

"** 00NIRANT ^ CutSETS ***** '

Page:

1-fitto: AP600 7 i

- file 3cRVR 02.WLK ( File created by linking rv rp.it' WLINKt ** Ver. 4.C2 "L

- Reduced sum of Cutsets: 1.0000E 08.

/GMBER CUTSET PROSY PERCENT BASIC EVENT NAME; EVENT PR05. -IDEWilPIER

-1

- 1.00E 08

-100.00 INITIATING EVENT - REACTOR VESSEL RUPTURE' EVENT OCCURS.

1.00E IEV-RV-RP I

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4 Files 30SIL 03. DES Crasted: Fri M1y 24 16:19:48 1996 P ge 1 of 3 Leng th o 17724' bytes,

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" *** DOMINANT CUTSETS **"*

Page:

1-

Title:

AP600-7 File: 30SIL 03.WLK ( File created byslinkinc st-lb.in WLINK2 ** Ver. G.02 ")

Reduced Sum of Cutsets: 3.2240E-09 NUMBER CUTSET PROS PERCENTd SASIC EVENT NAME EVENT PR06. '10ENTfffER 1

3.12E 09 96.77 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB COMMON CAUSE FAILURE OF 4TH STAGE ADS SQUlB VALVES TO OPERATE 3.00E 05 A0X-EV-SA 4

y 2

1.79E*11

.56 INITIAi!NG EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-St-LB COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC GROUPS (HARDWARE) 1.03E-04 CCX-!NPUT-LOGIC 3

1.64E-11

.51 INITIATING EVENT

SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB CONO. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE AOS 3.02E 03 ADN MAN 01 COMMON CAUSE FAILURE OF PMS ESF INDUT LOClO GROUPS (HARDWARE 1 -

1.03E 0&.

CCx-INPUT-LOGIC.

4 T.33E*T1' 41 INITIATING EVENT - SAFETY INJECil0N LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB OPERATOR FAILS TO ACTUATE A SYSTLM USING OAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCx PMxM001-SW 1.14E 11

.35 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI LB FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E 05 CCX PMxM001 SW 6

1.04E 11

.32 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E 02 REC MANDAS COMMON CAUSE FAILuflE OF OUTPUT ORIVERS 8.62E-06 CCX EP-SAM 7

8.96E 12

.28 INITIAi!NG EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI-LB FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS COMMON CAUSE FAILURE OF QUTPUT DRIVERS 8.62E-06 CCX EP-SAM 8

6.67E 12

.21 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB COND. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR F AILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3.84E 05 CMx-es FA y

9 6.11E-12

.19 INITIAi!NG EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-St-L8 1

COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 COMMON CAUSE FAILURE OF CMf/ SUMP LEVEL HEATED RfD SENSORS 3.84E-05 CMX-VS-FA a

10 1.91E 12

.06 INITIATING EVENT - SAFETY INJECT!ON LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM-MAN 02 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC SOFTWARE 1.10E 05 CCX-IN LOGIC SW 11 1.91E 12

.06' INITIATING EVENT - SAFETY INJECTION LINE 8REAK EVENT OCCURS 1.04E-04 IEV-St LB CONO. PR08. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 COMMON CAUSE FAILURE OF PMS ESF ACTUATION LOGIC SOFTWARE 1.10E CCX PMXMOD2 SW 12 1.91E-12

.06 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 1EV-St LB COMMON CAUSE FAILURE OF CMf/ SUMP LEVEL HEATED RfD SENSORS 3.84E-05 CMX-VS-FA COMMON CAUSE FAILURE OF SENSORS IN HIGH PRES $URE ENVIRONMENT 4.78E 04 CCX xMTR.

1 13 1.75E 12

.05 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 LEV-SI-LB COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC SOFTWARE 1.10E 05 CCx IN LOGIC SW 14 1.75E 12

.05 INITIATING EVENT

SAFETY INJECil0N LINE BREAK EVENT OCCURS 1.04E-04 LEV St L8 COND.- PRO 8. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 COMMON CAUSE FAILURE'0F PMS ESF ACTUATION LOGIC SOFTWARE 1.10E-05 CCX-PMXM002 SW IL 1.45E-12

.M (NITIA11NG EVENT f SAFETY INJECTION LINE BREAK EVENT 0CCURS r.04E-041 LEV-St-LB' COMMON CAUSE FAILURE OF PMS'AND PLS SOFTWARE-L 20E-06 OceSf TW '

OPERATOR falls TO ACTUATE. A SYSTEM USING DAS ONLY '

i.166-02 '

Rec-MANDAS-

^16' L 256-12

.J4 INITI ATING EVEuf i SAFE'TY IWJECTION LINE BREAK EVENT 0CCURS LO4E-04~.

EV-Sli-LB g

COMMON CAUSS FAILURE'0F PMS AND PLS SOFTWARE--

20E-06 CCCSrfa '

I

File: 30SIL 03. DES Crested: Fri May 24 11:19:48 1996 Page 2 of 3 Length: 17724 bytes Queued: -Fel'May 24 17:25:02 1996-FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MCAS 17 3.53E 13

.01 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04' IEV St-LB FAILURE OF MANUAL DAS HARDWARE -

1.00E 02 MOAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03' LPM MAN 02 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC GROUPS (KARDWARE) 1.03E 04 CCX-lNPUT LOGIC 18 3.23E-13'

.31 INITIATING EVENT - SAFETY INJECTION LINE BREAC EVENT OCCURS

1. 04E-04' iTV St LB FAILURE OF MANUAL DAS HARDhaRE 1.00E-02 MDAS OPERATOR F AILS To MANUALLY ACTUATE ADS 3.02E ADN MAN 01 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC GROUPS (HARDWARE) 1.03E 04 CCX INPUT LOGIC 19 1.32E 13

.00 INITIATING EVENT - SAFE 1Y INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV SI LB FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MOAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3.84E 05 CMX-VS FA 20 1.21E-13

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 LEV S! LB FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RTD SENSORS 3.84E 05

. CMX VS F A

1. 04E- 04' IEV St-LB 21 4.97E - 14%

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS

+

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN COMMON CAUSE FAILURE TO START OF ENGINE-DRIVEN FUEL PUMPS 2.00E 03 20X PD ES MAIN GEN. BKR ES 01 FAILS TO OPEN !# 12) 5.08E-03 ECOM0001 22 4.11E 14

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-St LB COMMON CAUSE FA! LURE OF CLASS 1E BATTERY CHARGERS 8.40E 06 CCX BC SA COMMON CAUSE FAlluRE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN 23 3.78E 14

.00 lNITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV S!-LB FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (MLOCA) 3.30E 03 LPM MAN 02 COMMON CAUSE FAILURE OF PMS ESF ACTUATION LOGIC SOFTWARE 1.10E-05 CCX PMXM002-SW 24

3. 78E - 14

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR F AILS TO RECOGNIZE NEED FOR RCS DEPR. (MLOCA) 3.30E-03 LPM-MAN 02 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC SOFTWARE 1.10E-05 CCX IN LOGIC-SW 25 3.45E 14

.00 INITIATING EVENT SAFETY INJECil0N LINE BREAK EVENT OCCURS 1.04E-04 IEV SI-LB FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR F AILS TO MANUALLY ACTUATE ADS 3.02E 03 A0N MAN 01 COMMON CAUSE FAILURE OF PMS ESF ACTUATION LOGlc SOFTWARE 1.10E-05 CCX-PMXM002 SW 26 3.45E-14

.00 INITIATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV-St-LB FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR F AILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC SOFTWARE 1.10E-05 CCX IN LOGIC-SL 27 2.03E 14

.00 lNITIATING EVENT

SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 LEV St-LB HARDWARE FAILURE OF ST. #4 LINE 2 5.80E 04 AD4M0008 HARDWARE FAILURE OF ST. #4 LINE 3 5.80E 04 AD4M0009 -

HARDWARE FAILURE OF ST. #4 LINE 4 5.80E 04 AD4M0010 28 2.03E-14

.00 INITIATING EVENT. SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St-LB HARDWARE FAILURE OF ST. #4 LINE 1 5.80E 04 AD4M0007 HARDWARE FAILURE OF ST. #4 LINE 3 5.80E-04 A04M0009-HARDWARE FAILURE OF ST. #4 LINE 4 5.80E 04 AD4M0010 29 2.03E 14

.00 INITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E-04 IEV St LB HARDWARE FAILURE OF ST. #4 LINE 1 5.80E-04 A04M0007 HARDWARE FAILURE OF ST. #4 LINE 2 5.80E 04 AD4M0008 HARDWARE FAILURE OF St. #4 LINE 4 5.80E 04 AD4M0010 30 2.03E 14

.00 lNITIATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV SI LB HARDWARE FAILURE OF ST. #4 LINE 1 5.80E-04 AD4M0007 HARDWARE FAILURE OF ST. #4 LINE 2 5.80E-04 AD4M0008 4ARDWARE FAILURE,0F ST. 84 LINE 3 5.BOE-04 AD4M0009 31 1.81E 14'

.30 INITI ATING EVENT SAFETY INJECTION LINE BREAK EVENT OCCURS 1.04E 04 IEV-SI-LB COMMO% CAUSE FAILURE OF CLASS 1F SATTERIES 4.70E-05 CCX BY PN COMMON CAUSE fAlLURE.4KV BREArER TC 9.0$E 7.30E-04 ECX CB GO MAIN GEN. BKR ES 01 FAILS To OPEN !# *.2) 5.08E-03 ECOM0001 32 1.390-14

.00 !NITI ATING EVENT - SAFETY INJECT!DN LthE EREAK EVENT OCCURS 1.048-04

EV-St '.B COMMON CAUSE FAILURE OF CLASS 1E BATTERIES

. 70E-05 CCX 8Y-PN-

Files 30SIL-03. DES Crocted: Fri May-2416:19:48-1996-Queued. t Frf Mey-24 17:25:02 1996 '

Page 3 of 3 Length: 17724' bytes.

7.

COMMON CAUSE FAILURE OF STANDSY DG TO RUN 4.40E 04 20X-0G DR MAIN GEN! SKA ES 01 FAILS TO OPEN [# 122 5.08E 03,

ECOM0001 33 1,07E-14

.00 INIflATING EVENT - SAFETY INJECTION LINE BREAK EVENT OCCURS t.04E-04~

IEV-St-LB FAILURE OF PMS, PLS AND DAS IMOICAf!ON FOR OPERATOR ACTIONS 1.00E-06 ALL IND FAIL COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC GROUPS (HARDWARE) 1.03E-04 CCX-INPUT-LOGIC 34 -

1.04Ea14' 00 (NITI AT!NG EVENT + SAFETY INJECTION LINE SREAR EVENT OCCURS t.04E IEV-St-LB COMMON CAUSE FAILURE OF CLASS 1E SATTERIES' 4.70E-05 CCX-BY PN COMMON CAUSE FAILURE 4KV BREAKERS TO OPEN 4.20E-04 ECX-CB-C0 MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E 03 ECOMOD01

/

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Files 6ESGT 07. DES Created: Fri May 24 16:19:56 1996 t Page 1 of 1 Length: 5495 bytes Queued: 1Fri May 24 17:25:02 1996 '

- - - - DOMINANT - CUTSET S *****

Page:

1 Titto: AP600 7 Filet 6ESGT 07.WLK ( WLINK2 4.02

WARNING ** MAX CUTSET limit REACHEDi PR06ASILITY INCREASED)

Reduced Sum of Cutsets: 2.4350E 09 NUMBER 1 CUTSET PROS PERCENT BASIC EVENT NAME EVENT PROB.

IDENTIFIER 1

6.64E 10 27.27 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS S.20E-03 IEV SGTR COMMON CAUSE FAILURE OF PMS ESF DUTPUT LOGIC SOFTWARE 1.10E 05 CCx PMxMOD1-SW OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLf 1.16E-02 REC MANDAS 2

5.72E-10 23.49 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR COMMON CAUSE FAILURE OF PMS ESF OUTPUT LOGIC SOFTWARE 1.10E-05 CCX PMxM001-SW FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 3

5.20E 10 21.36 SNIT! ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF OUTPUT DRIVERS 8.62E-06 CCX EP SAM OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS 6

4.48E-1G=

18.40 (N!TIATING EVENT a STEAM' GENERATOR, TUBE RUPTURE EVENT OCCtAS 5.20E-03 '

IEV SGTR COMMON CAUSE JAILURE OF DUTPUT DRIVERS 5.62E 06 CCx EP SAM 1.00E 02 MDAS FAILUPE OF MANUAL DAS HARDWARE 5

9.54E-11 3.92 INITIAT!NG EVENT - STEAM GENERATOR TUBE RUPTURE EVCNT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF SENSORS IN HIGH PRESSURE ENVIRONMENT 4.78E-04 CCx-xMTR COMMON CAUSE FAILURE OF CMT/ SUMP LEVEL HEATED RfD SENSORS 3.84E-05 CMX-vs FA 6

7.24E 11 2.97 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 1EV-SGTR COMMON CAUSE FAILURE OF PMS AND PLS SOF.TWARE 1.20E 06 CCX SFTW OPERATOR FAILS TO ACTUATE A SYSTEM USl3G DAS ONLY 1.16E-02 REC MANDAS 7

6.24E-11 2.561 INITIATING EVENit-STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E IEV SGTR COMMON CAUSE FAILURE OF PMS AND PLS SOFTWARE 1.20E-06 CCX-SFTW FAILURE OF MANUAL DAS HARDWARE 1.00E-02.

MDAS 8

5.36E 13

.02 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR FAILURE OF PMS, PLS AND DAS !N01 CATION FOR OPERATOR ACTIONS 1.00E-06 ALL-IND-FAIL COMMON CAUSE FAILURE OF PMS ESF INPUT LOGIC GROUPS (HARDWARE) 1.03E-04 CCX-!NPUT-LOGIC 9

3.16E 13

.01' [NiflATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS -

5.20E-03' LEV SGTR OPERATOR FAILS TO DIAGNOSE SGTR EVENT 1.84E-03 CIB MAN 00 COMMON CAUSE FAILURE OF 4TN STAGC ADS SQUIB VALVES TO DPERATE 3.00E ADX:EV SA COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LjNE MOVs TO OPEN 1.10E 03 ADx-MV GO 10 2.30E 13.

.01. INITIATING EVENT - STEAM GENERATOR TUBE RUPiURE EVENT OCCURS 5.20E-03 IEV SGTR OPERATOR FAILS TO CLOSE MS!v FOR FAILED SG 1.34E-03 CIB MAN 01 COMMON CAUSE FAILURE OF 4TH STAGE ADS SQUlB VALVES TO OPERATE 3.00E-05 ADX-EV-SA COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E 03 ADX-MV Go 11' 1.87E-13'

.01. INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR A0V MSiv V040B FAILS TO CLOSE 1.09E SGBAV040LA COMMON CAUSE FAILURE OF 4TH STAGE ADS SQUIB VALVES TO OPERATE 3.00E-05 ADX EV SA COMMON CAUSE FAILURE OF 4/4 STAGE 2 & 3 LINE MOVs TO OPEN 1.10E-03 ADx-MV-GO 6a l

Fils: 6ESGT 23. DES Crested: Fri nzy 24 16:20:06 1996 Pasi 1 of 5 Length: 41215 bytea Queued: Fri M y 2417:25:021996

- - - - DOMINAN E CUTSETS *****

Page:

1

Title:

AP600 7 Files 6ESGT 23.WLK ( WLINC2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PR08A81LITY INCREASED)

Reduced Sim of Cutsets: 2.3320E 09 NUMBER CUTSET PROS PERCENT BASIC EVENT NAME-EVENT PRDS. 1 DENT!FIER 1

1.02E 09 43.74 !NITIATING EVENT - STEAM GENERATOR TUBE RUPTDRE FVENT OCCURS 5.20E 03

!EV SGTR OPERATOR FAILS TO DIAGNOSE SGTR EVENT 1.84E 03 CIB MAN 00 COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E-04 RPX CB Go CONO. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC COND PROB. OF ADN MAN 01(OPER. FAILS 10 ACT. ADS) 5.00E-01 ADN MAN 01C 2

8.59E-10 36.84 !NITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR OPERATOR FAILS TO ACTUATE CVS IN AUX. SPRAY MODE IN SGTR EVENT 3.10E 03 CVN MAN 00 OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E 01 ADF MAN 01 COMMON CAUSE FAILURE OF RCP SREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC CONO. PROS. OF ADN-MAN 01(OPER. FAILS.TO ACT.' ADS) 5.00E 01-ADN MAN 01C 3

4.80E TI' 2.06 INITI ATING EVENT STEAM GENERATOR, TUBE RUPTURE EVENT OCCURS 5.20E-03 I EV-SGTR CVS MECHANICAL FAILURE OF A0V V084 AND CV V085 TO OPEN 2.8SE 02 CVM0005 OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PR2 SPR FAILS) 5.00E-01 ADF-MAN 01 COMMON CAUSE FAILURE OF RCP BREAKERS FA!L TO OPEN 4.20E-04 RPX-CB Go COND. PRO 8. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN-MAN 01 4

4.71E 11 2.02 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03

!EV SGTR SFW MOV V067A FAILS TO OPEN 1.41E 02 FWMOD067A COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB+G0 COND. PROS. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 5

4.71E-11 2.02 INITI ATING EVENT - STEAM CENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR SFW HOV V028 FAILS TO OPEN 1.41E-02 FJM00028 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX C8 Go COND. PRO 8. OF REC-MANDAS (FAILURE OF M/kUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 6

4.54E 11 1.95 INITIATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR CVS MECHANICAL FAILURE OF A0V V081 FAILS TO CLOSE 2.71E 02 CVM0007 OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E 01 ADF-MAN 01 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX-C8 Go COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 7

2.13E-11

.91 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 1EV SGTR CVS MECHANICAL FA! LURE OF A0V V084 AND CV V085 TO OPEN 2.88E 02 CVMODOS OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E 01 ADF MAN 01 COMMON CAUSE FAILURE OF RCP SREAKERS FAIL TO OPEN 4.20E-04 RPX C8 Go COND. PROB OF REC MANOAS (FA! LURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E-03 LPM MAN 01 8

2.09E 11

.90 INITI ATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR SFW MOV V067A FAILS TO OPEN 1.41E 02 FWM00067A j

COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E 04 RPX-CB Go COND. PRO 8. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC 4

OPERATOR FAILS 70 RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E-03 LPM MAN 01 9

2.09E-11

.90 INITIAtlNG EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CB-GO COND. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FA!LS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E-03 LPM MAN 01 10 2.01E-11

.66.!NITIAftNG EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR CVS MECHANICAL FAILURE OF A0V V081 FAILS 70 CLOSE 2.71E 02 CVM0007 OPERATOR FALLS TO MANUALLY ACTUATE ADS (SGTR IF PRZ_ SPR FAILS) 5.00E-01 ADF MAN 01 COMMON CAUSE FAILURE OF RCP BREAKERS Fall to OPEN.

4.20E-04 RPX CB Go COND. PRO 8. OF REC-MANDAS (FAtLURE OF MANUAL DAS ACT.)

5.06E REC MANDASC 3PERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT 1 f.34E-03 LPM MAN 01 f

l 11 2.00E 11

.56 INITI ATING EVENT.

STEAM. GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03

!EW SGTR -

f OPERATOR FAILS TO DI AGNOSE SGTR EVENT T.S4E 03 CIB-MAN 00 i

COMMON CAUSE J AILURE OF RCP BREAKERS FA)L 10 GREN

. 20E 04

,RP4 CB GO'.

4 FAILURE OF MANUAL GAS N4RDWAet 1.00E-02 40AS' l

File 6cSGT 23.0ES Crested: Fri M2y 24 16:20:06 1996 Page 2 of 5 Length: 41213 bVtes Queued:- Fri May 24 17:25:02 1996 COND. PROS. OF 40N MAN 01(OPER. FAILS 70 ACT, ADS) 5.00E-Of ADN MAN 01C 12 1.74E 11

. 75 INITI AtlNG EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03' IEV SGTR.

FAILURE OF AIR COMPRESSOR TRANSMITTER.

5.23E 03 CANTP0f1RI COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E 04 RPX CS-GO,

CONO. P408. 0F REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE A05 :

3.02E 03 ADN MAN 01 13

1. 70E

11

. 73 INITIAi!NG EVENT STEAM GENERATOR fuse RUPTURE EVENT OCCURS 5.2CE 03 LEV SGTR MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12]

5.08E 03 ECOM0001 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX C8-GO COND. PROB. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN P.*N01 14 1.69E 11

.72 INITIATING EVENT STEAM GENERATOR TU8E RUPfuRE EVENT OCCURS 5.20E 03 IEV SGTR OPERATOR FAILS 70 ACTUATE CVS IN AUX. SPRAY MODE IN SGTR EVENT 3.10E 03 CVN MAN 00 OPERATOR FA!LS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E 01 ADF-MAN 01 l

COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CS GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MOAS CONO. PROS. OF ADN MAN 01(OPER. FAILS TO ACT ADS) 5.00E 01 ADN-MAN 01C 15 9.33E-12

.39 [NITI AtlWG EVENi< - STEAM GENERATOR' TUBE RUPTURE EVENT OCCURS-3.20E 33 IEV SGTR -

UNAVAILA81LITY OF BUS ECS ES 1 DUE.70 UNSCHEDUU MAlWTENANCE 2.70E-03 EC18S00lTM

{

COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO COND. PR084 0F REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS

~

3.02E 03 ADN MAN 01 16 9.03E-12

.39 IN!TI AflNG EVENT - STE AM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR BUS UNAVAILABLE OVE'TO UNSCHEDULED MAINTENANCE 2.70E 03 EC185012TM COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO CONO. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE A05 3.02E 03 ADN MAN 01 l

17 9.03E 12

.39 INITIATING EVENT - STEAM GENERATOR fuBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR UNAVAILABILITY OF BUS ECS ES 2 OUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC285002fM COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E-04 RPX CB GO CONO. PR08. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E 01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 18 9.03E.39 INlflATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 LEV SGTR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC28S021TM COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX-CB Go CONO. PROS. OF REC *MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC-MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 19 9.03E 12

.39 ! NIT!ATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285211TM COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E 04 RPX C8 GO CONO. PROB. OF REC-MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03-ADN MAN 01 J

20 7.76E.33 !NITI Ai!NG EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 LEV-SGTR FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011RI COMMON CAUSE FAILURE OF RCP SREAKERS Fall TO OPEN 4.20E-04' RPX-CB-Go CONO. PROG. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGNI2E NEED FOR RCS DEPR (SLOCA/TRANS!ENT) 1.34E 03 LPM MAN 01 21 7.50E-12

.32 IN!f!ATING EVENT - STEAM GENERATOR TUSE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR MAIN GEN. 8KR ES 01 FAILS to OPEN [# 12]

5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CS Go' COND. PRO 8. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E-03 LPM MAN 01 22 5.02E 12

.22 INiilATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE OF STEAM DUMP VALVES TO OPEN 1.50E 03 MSX AV FA COMMON CAUSE FAILURE Of RCP BREAKERS Fall TO OPEN 4.20E 04 RPX-CB G0 CONO. PROS. OF REC MANDAS (FAILURE OF MANUAL DAS Act.)

5.06E-01 REC MANDASC OPERATOR FAILS 70 MANUALLY ACTUATE AOS 3.02E 03 ADN MAN 01 23 4.49E-52'-

.t9: !NITIATING EVENT STE AM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR OPERATOR FA!LS TO CLOSE MSiv FOR FAILED SG 1.34E-03 CIS MAN 01 COMMON CAuSE FAILURE OF RCP BREAKERS Fall TO OPEN

. 20E-04 RPX CB GO CONO. PRO 8. OF REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E REC-MANDASC

)

OPERATOR FAILS TO MANu4CLT ACTUATE ADS 3.02E 03 ADN-MAN 01 24 4.41E.'9 4 INITI AilNG EVEN) - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR OPERATOR FAILS TO CONTROL STEAM DUMP VALVES IN A SGTR EVENT.

i.32E-03 3 UMP-MAN 01 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL 70 OPEN.

. 20E-04' 4PX CB-GO

File: 6ESGi 23. DES Crotteds.Frl Rey 24 16:20:06 1996 Page 3 of 5 Length: 41215 bytes Queued: eFri May 24 17:25:02 1996 COND. PROS. OF. REC MANDAS (FAILURE OF MANUAL DAS ACT.)

5.06E-01 REC MANDASC OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-D3 ADN MAN 01 25

'2.63E-12 11 (NITIATING EVENT STEAM GENERATOR TUBE' RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR STAND 8Y DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E 02~

201DG001tM MAIN GEN. BrR ES 01 FAILS To OPEN (# 12]

5.08E 03 ECOM0001 STAND 8Y DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 ZO2DG002TM COMMON CAUSE FAILURE OF CLASS 1E 8ATTERIES 4.70E 05 CCX BY PN 26 2.48E 12

.11 INITIAi!NG EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE 10 START OF ENGINE DRIVEN FUEL PUMPS 2.00E-03 20X PD ES MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12]

5.08E 03 ECOM0001 COMMON CAUSE FAILURE OF CLA?L 1E BATTERIES 4.70E 05 CCX BY PN 27 2.18E 12

.09 INit!ATING EVENT - STEAP GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR FAILURE OF PMS, PLS #a0 DAS INDICATION FOR OPERATOR ACTIONS 1.00E-06 ALL !ND FAIL 1

COMMON CAUSE FA! LORE OF RCP BREAKERS Fall TO OPEN 4.20E 04 RPX CB GO 28 2.05E 12

.09 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF CLASS 1E BATTERY CHARGERS 8.40E-06 CCX 8C SA COMMON CAUSE FAILURE OF CLASS 1E BATTERIES

. 70E 05 CCX BY-PN 29 1.75E 12

.08 [NITIATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE OF CLASS 1E 8AffERIES 4.70E 05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285022TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC18512?TM 30 1.78E-12

.08 INITIAi!NG EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF CLASS 1E BAffERIES 4.70E 05 CCX BY PN BUS UNAVAILA8LE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC285221TM UNAVAILA81LifY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM 31 1.78E 12

.08 INITIATING EVENT - STEAM CENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E-03 EC26S221TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC18S012TM 32 1.78E 12

.08 INITIAilNG EVENT - STEAM GENERATOR TUBE RUPfuRE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY-P4 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC285221TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC18S121TM 33 1.78E 12

.08 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE

2. 70E-03 EC285002TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX BY PN 34

1. 78E - 12

.08 [ Nit!ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR I

UNAVAILASILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC18S001TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC28S022TM l

COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN 35 f.78E-12

.08 ! NIT!ATING EVENT STEAM GENERATOR TUBE RUPfuRE EVENT OCCURS 5.20E-03 IEV $GTR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC18S012TM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN 36 1.78E 12

,08 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 (EV SGTR SUS UNAVAILABLE DUF 70 UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE

2. 70E -03 EC2BS022TM COMMON CAUSE FAILURE OF CLASS 1E BATTERIES

4. 70E -05 CCX 8Y-PN 37 1.78E-12

.08 INiilAflNG EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 (EV-SGTR COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY PN BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC18512tTM UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC2BS002TM 38 1.15E 12

.05 INITIAflNG EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR STANDBY DG UNAVAILABLE DUE TO TEST AND MAINTENANCE 4.60E-02 2010G001TM MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12]

5.08E 03 ECOM0001 3G FAILS TO START & RUN OR BKR 202 FAILS TO CLOSE 2.02E 02 202MC301 COMMON CAUSE. FAILURE OF CLASS 1E BATTERIES 4.70E-05 CCX BY-PN 37 f.15E-12

.05

N!I!AT14G EVENT - STEAM GENERATOR TuSE RUPTURE EVENT Occuas 5.20E 03

!EV SGTR 3G FAILS TO START & RUN OR BKR 102 FA!LS TO CLOSE 2.02E-02 201M0001 r

4 MAIN GEN. 8KR ES 01 FAILS TO OPEN (# 12]

5.08E 03 ECOM0001-STANDBY DG UNAVAILA8LE DUE TO TEST AND MAINTENANCE

. 60E 02 202aG002TM t.

COMMON CAUSE FATLURE,OF CLASS 1E BATTERIES

. 70E-05 CCX-BY-pq

Filer 6ESGT 23. DES Crocted: Fri May*24 16:20:06 1996 Ptge 4 of 5 Length: 41215 bytes Queued: 'Frt May 24 17:25:02 1996 40 9.50E-13

,.04 INITIATING EVENT - STEAM GENERATOR TUSE RUPTURE EVENT OCCURS 5.20E-03

!EV-$GTR CVS MECHANICAL FAILURE OF ADV V084 AND CV V085 70 OPEN 2.88E 02 CVM0005 OPERATOR FA!LS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E-01 ADF MAN 01 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CB GO FAILURE OF MANUAL DAS RARDWARE 1.00E MCAS OPERATOR FAILS TO MANUALLY ACTUATE A05 3.02E 03 ADN MAN 01-41 9.30E 13 '

.04 INITIATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E 03 IEV*SGTR SFW MOV V067A FAILS TO OPEN 1.41E 02 FWM00067A COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX-CB Go FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN-MAN 01 42 9.30E-13

.04 INITIATING EVENT - STEAM CENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR SFW MOV V028 FAILS To OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX-CB G0 FA! LURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 C?

9.06Ewt3

.04 tlN!TIATING EVENT SIEAM GENERATOR TU8E RUPTURE.EVEN?. DCCURS-5.20E-03' IEV-SGTR COMMON CAUSE FAILURE / 4KV SREAKER TO CLOSE T 7.30E-04' ECX-CB GC-MA!N CCM, EKR ES Of falls TO OPEN [# 1 21 5.08E-03" ECOM0001 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX 8Y PN 44 8.94E 13

.04 INITI ATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR CVS MECHANICAL FAILURE OF ACV V081 FAILS To CLOSE 2.71E 02 CVM0007 OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E-01 ADF-MANO)

COMMON CAUSE FAILURE OF RCP BREAKERS FA!L TO OPEN 4.20E 04 RPX-CB GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 45 5.46E 13

.02, INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE OF STANDBY DG TO RUN 4.40E 04 20X DG DR MAIN GEN. SKR ES 01 FAILS TO OPEN 18 12]

5.08E 03 ECOM0001 COMMON CAUEE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY-PN 46 5.21E-13

.02 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR COMMON CAUSE FAILURE 4KV BREAKERS TO OPEN 4.20E 04 ECX-CB-GO MAIN GEN BKR ES 01 FAILS TO OPEN l# 121 5.08E 03 ECOM0001 COMMON CAUSE FAILURE OF CLASS 1E BATTERIES 4.70E 05 CCX-BY PN 47 4.21E-13

.02 t INITIATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR CVS MECHANICAL FAILURE OF A0V V084 AND CV V085 TO OPEN 2.88E-02 CVM0005 OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E 01 ADF-MAN 01 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX-CB GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FA!LS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPN-MAN 01 48 6.13E-13

.02! INITI ATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E-03 LEV-SGTR SFW MOV V067A FAILS TO OPEN 1.41E 02:

FWM00067A COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN, 4.20E-04 RPX CB GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS 70 RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E-03 LPM MAN 01 1

49 4.13E-13

.02 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03

!EV SGTR SFW MOV V028 FAILS TO OPEN 1.41E-02 FWM00028 COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E-04 RPX CB Go FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E-03 LPM-MAN 01 50 3.97E 13

.02 ' INITIATING EVENT STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR CVS MECHANICAL FAILURE OF ADV V081 FAILS to CLOSE 2.71E 02 CVM0007 OPERATOR FAILS TO MANUALLY ACTUATE ADS (SGTR IF PRZ SPR FAILS) 5.00E-01 ADF MAN 01 COMMON CAUSE FAILURE OF RCP SREAKERS FAIL TO OPEN 4.20E 04 RPX-CB GO F AILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO RECOGNIZE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM MAN 01 51 3.45E-13

.01 INITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR

' ALLURE OF. AIR COMPRESSOR TRANSMITTER 5.23E-03 CANTP011RI COMMON CAUSE. FAILURE OF RCP BREAKERS FAIL-TO OPEN 4.20E-04 RPX-CB GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 3PERATOR FAILS TO MANUALLY ACTUATE ADS 3.0ZE-03 ADN MANOT 52 3.35E'13-

.31 INITIATING EVENT STEAM GENERATOR TU8E RUPTURE EVENT OCCURS 5.20E 03 IEV SGTR MAIN GEN. BKA ES 01 FAILS To OPEN (# 12) 5.08E 03 ECOMOD01,

COMMON CAUSE F AILURE OF RCP BREAKERS F AILS To OPEN

. 20E-04 RPt-C9 GQ 8AILURE OF MANUAL DAS MARDWARE

00E-02 CAS

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Queued-Fri May 24 17:25:02 1996-OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02e-03 ADN MAwoi 53 2.79E 13

.01 tNITIATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E 05 CCX PMXM004-SW COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E RPX CS GO OPERATOR FAILS TO ACTUATE A SYSTEM USING DAS ONLY 1.16E-02 REC MANDAS 54 2.40E-13

.31 INITI ATING EVENT - STEAM GENERATOR TUSE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR COMMON CAUSE FAILURE OF PMS ESF MANUAL INPUT MULTIPLEXER SOFTWA.

1.10E-05 CCX PMXM004-SW COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CB Go l

FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS 55 1.78E 13

.01 INITIATING EVENT - STEAM GENERATOR TU8E RUPTURE EVENT DCCURS 5.20E 03 IEV SGTR UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CB GO FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 i

56 1.78E-13

.01 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 LEV-SGTR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX-CB-GO s

1.002-02 MDAS l

FAILURE OF MANUAL DAS HARDWARE OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 f

57 1.78E 13 '

.01 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV SGTR UNAVAILABILITY OF BUS ECS ES 2 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC2BS002TM COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E 04 RPX CB Go FAILURE OF MANUAL DAS HARDWARE I.00E 02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 58 1.78E 13

.01 INITIATING EVENT - STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 LEV SGTR BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS021TM COMMON CAUSE FA! LURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX CB GO FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO MANUALLY ACTUATE ADS 3.02E-03 ADN MAN 01 1

59 1.78E 13

.01 INITI ATING EVENT - STE AM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGT2 BU$ UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC2BS211TM COMMON CAUSE FAILURE OF RCP BREAKERS Fall TO OPEN 4.20E-04 RPX CB-GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS 70 MANUALLY ACTUATE ADS 3.02E 03 ADN MAN 01 60 1.53E 13

.01 INIT! AT!NG EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E 03 IEV-SGTR FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011RI COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E-04 RPX CS GO FAILURE OF MANUAL DAS HARDWARE 1.00E 02 MDAS OPERATOR FAILS TO RECOGN!ZE NEED FOR RCS DEPR. (SLOCA/TRANS!ENT) 1.34E-03 LPM MAN 01 61 1.49E-13

.01 INITI ATING EVENT STEAM GENERATOR TUBE RUPTURE EVENT OCCURS 5.20E-03 IEV-SGTR MAIN GEN. BKR ES 01 FAILS TO OPEN [# 12]

5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF RCP BREAKERS FAIL TO OPEN 4.20E 04 RPX C8 GO FAILURE OF MANUAL DAS HARDWARE 1.00E-02 MDAS OPERATOR FAILS TO RECOGNITE NEED FOR RCS DEPR. (SLOCA/ TRANSIENT) 1.34E 03 LPM MAN 01 I

l 4

l 1

.~.

Fils: 6LCSG 03.0ES Crsetedt Frt May 24 11:20:18.1996.

Page 1 of 8 Length: 704T4 bytes Queued: Fri May 24 17:25:02 1996

- - - - DOMINANT CUTSETS *****

Page:

1

Title:

AP600 7 Files 6LCSG 03.WLK ( WLlNK2 4.02

WARNING

MAX CUTSET LIMIT REACHED, PROSABILITY INCREASED)

Reduced S e of Cutsets: 2.1290E-09 CUMBER 1 CUTSET PROS PERCENT BASIC EVENT NAME EVENT PRO 8..

!OEWilFIER 1.00E-02 OTH SGTR T

6.12E-10

28. 75 CONSEQUENTIAL SGTR OCCURS i

INITI ATING EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E 01 LEV LCOND.

FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 ofw SLSOV1 COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 2

4.59E-10 21.56 CONSEQUENTI AL SGTR OCCURS 1.00E 02 OTH-SGTR INITIATING EVENT

LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSifE AC POWER IN 30 MINUTES 7.00E 01

,ofM ROS i FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOVli COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 3

3.15E110 14.80 INITIATING EVENT MAIN STEAM LINE STUCK-OP;d SV OCCURS i

1.21E 03 IEV-SL8-V 1.00E 02 ofH SGTR CONSEQUENTIAL SGTR OCCURS 5

COMMON CAUSE FAILURE OF 4 SQUl8 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 4

1.12E 10 5.26 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITI Af!NG EVENT LOSS OF CONDEN'.ZR EVENT DCCURS 1.12E-01

!EV LCOND FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (Sv/PORV) 2.10E 02 OTH SLSOV1 COMMON CAUSE FAILURE OF TANK LEVEL TRANSM!TTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $!GNAL FAILS) 1.00E-02 REN-MAN 04 5

9.05E 11 4.25 CONSEQUENTI AL SGTR OCCURS 1.00E 02 ofM SGTR INITIATING EVENT

LOSS OF COMPRESSED AIR EVENT OCCURS 3.48E-02 IEV-LCAS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV) 1.00E-02 OTH SLSOV2 COMMON CAUSE FAILURE OF 4 SQU!8 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 6

8.43E-11 3.96 CONSEQUENTIAL SGTR OCCURS 1.00E 02 of* SGTR INITIATING EVENT LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO REC 0VER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH ROS FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SLSOV1 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS)

1. 00E-02 REN-MAN 04 7

6.4dE 11 3.04 INITIATING EVENT - STEAM LINE UPSTREAM OF MS!V DCCURS

3. 72E + 04 IEV-SLB U SINGLE CONSEQUENTIAL SGTR OCCURS 6:70E 03 OTH-SGTR1 COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E 05

!WX EV4-SA 8

5. 78E-11 2.71 INITIAf!NG EVENT MAIN STEAM LINE STUCK OPEN SV OCCURS 1.21E-03 IEV-SL8-V CONSEQUENil AL SGTR OCCURS 1.00E-02 ofM SGTR COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (!RWST, 8AT) 4.78E-04 IWX xMTR.

OPFRATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL S!6NAL FAILS) 1.00E-02 REN-MAND 4 9-2.09E-11

98. CONSEQUENTIAL $GTR OCCURS 1.00E-02 OTH-SGTR INITIAf!NG EVENT TRANSIENT WITH MFW EVENT OCCURS.

1.40E+00 LEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 ofH-SL50V FA! LURE OF AIR COMPRESSOR TRANSMITTER 5.23E-03 CANTP011RI COMMON CAUSE FAILURE OF 4 Scu!8 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 10 2.09E-11

.98' CONSEQUENilAL SGTR OCCURS 1.00E-02 OTH SGTR INITIAi!NG EVENT - TRANSlENT WITH MFW EVENT OCCURS 1.40E+00-IEV TRANS FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 1.10E OTH SLSOV TRANSMlffER FAILURE 5.23E 03 CONTF018Rt COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05 IWX-EV4-SA 11 2.03Er11

.95 CONSEQUENT!AL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT IRANSIENT WITH MFW EVENT CCCSo!.

1.40E+00 LEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV MAIN GEN. SKR ES 01 FAILS TO OPEN (# 12) 5.08E 03 ECOM0001 COMMON CAUSE FAILURE OF 4 S0018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 12' T.84E-10

.36 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-$GTR INITI Af!NG EVENT - STEAM LINE UPSTREAM OF MSiv DCCURS 3.72E-04 IEV-SLB-U MSL8 UPSTREAM OF MSIVs DU1S10E CONTAINMENT 1.90E-01 OTH-8L COMMON CAUSE FAILURib 0F 4 SQU18 VALVES.!N RECIRC LINES 2.60E-05 IWX EVA-SA 13' 1.666 11 78 00NSEQUENTIAL SGTR OCCURS-1.00E 02 OTH SGTA IN!TIAi!NG EVENT LOSS OF COMPRESSED AIR EVENT OCCURS 3.48E-02 IEV-LCAS

' ALLURE OF,A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV) 1.00E-02 OTH SLSOV2 tc COMMON CAUSE FAILURE OF T Aamt LEVEL # TRANSMITTERS (IRWST. 8A1)

. 78E 04

WX xMTR k-

1 Fils: 6LCSG 03. DES Created: Fri May 24 16:20:18 1996 Page 2 of 8 Lengthri70474 bytes Queued: Fri May 24 17:25:02 1996 OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS).

1.00E 02 REN MAN 04

)

i 14 1.19E - 11

.56 !NITIATING EVENT - STEAM LINE UPSfREAM 0F MSIV OCCURS

3. 72E -04 IEV-SLB U l

SINGLE CONSEQUENTI AL SGTR OCCURS 6.70E-03 OTH-SGTR1~

l COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT)

.78E 04 IWx xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E 02 REN->AN04 1

l 15 1.0$E-11

.51 CONSEQUENTI AL SGTR OCCURS 1.00E-02 OTH SiTR INITI ATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-fFANS FAILURE OF A SECONDARY SIDE REL!EF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLhSV j

UNAVAILABILifY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC18S001TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4-fA 16 1.08E 11

.51 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR

)

INITIAi!NG EVENT = TRANSIENT WITH MFW EVENT OCCURS 1.40E+00

!EV TRANS i

FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E 03 EC1BS012TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 17 9.5 7E-12 45 CONSEQUENTIAL SGTR OCCURS 1.00E OTH-SGTR INITIATING EVENT - LOSS OR MAIN FEEDWATER EVENT OCCURS, 3.35E 01 IEV LMFW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011RI COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 18 9.29E 12 44 CONSEQUENilAL SGTR OCCURS 1.00E-02 ofH SGTR

! NIT!ATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW FAILURE OF A SECONDARY !!DE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 MAIN GEN. BKR ES 01 FAILS TO OPEN [# 121 5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 19 6.01E 12

.28 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT

TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH-SLSOV COMMON CAUSE FAILURE OF STEAM DUMP VALVES TO OPEN 1.50E-03 MSX AV FA COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 20 5.48E 12

.26 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTM SGTR INITIATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01 IEV LMFW1 FAILURE OF A SECONDARY SIDE REllEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E-03 CANTP011RI COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 21 5.48E-12

.26 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR 1

! NIT!ATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E 01 LEV-LMFW1 i

FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 TRANSMITTER FAILURE 5.23E 03 SG2TF50ARI COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN REClRC LINES 2.60E-05 IWX-EV4-SA 22 5.48E 12

.26 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01 LEV LMFW1 FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH-SLSOV1 TRANSMITTER FAILURE 5.23E-03 CDNTF01BRI COMMON CAUSE FAILURE OF 4 SQU!B VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 23 5.33E-12

.25 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E 01 IEV LMFW1 FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 MAIN GEN. SKR ES 01 FAILS TO OPEN !# 12]

5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN REC 1RC LINES 2.60E-05 (WX EV4 SA 24 4.94E 12

.23 CONSEQUENTIAL SGTR OCCURS-1.00E-02 OTH SGTR INITI ATING EVENT LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE ($V/PORV) 2.10E 02 ofH SLSOV1 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC18S001TM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 25 4.94E*12

.23 CONSEQUENTI AL SGTR OCCURS 1.00E-02 OTM SGTR INITI ATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW FAILURE OF A SECONDARY SIDE REllEF VALVE TO CLOSE (SV/PORV) 2.10E-02.

OTH SLSOV1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012TM COMMON CAUSE FAILURE OF 4 S0018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 36

. 30E 12 19 CONSEQUENTIAL SGTR OCCURS.

1.'00E-02 OTH-SGTR INITIATING EVENT - TRANSIENT WITH MFV EVENT OCCURS T.40E+00 EV-fRANS FAILURE OF.A SECONOARY SIDE RELIEF VALVE TO CLOSE (SV/PORV)*

10E-02 OTH-SLSOV' 8 AltuRE OF MAIN COND, EVACUAf!ON STSt. TO PROVIDE VACUUM t.00E-03 CONOVACUUM-s COMMON CAUSE FAILURE OF 4 Sou!8 VALVES IN REC 1RC LINES 2.60E-05

WX EV4 SA

s filer 6LCSG 03.0ES Created: Fri May 24 16:20:18 1996 Queuedo Fri May 24 17:25:02 1996 Ptge 3 of 8 Lengtha t70474 bytes c 27 3.98E 12,

.19 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR -

INITI ATING EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E 01 IEV LCOND FAILURE OF A SECONDARY $!DE RELIEF VALVE TO CLOSE.(SV/PORV) 2.10E-02 OTH SLSOV1 HARDWARE FAILURE OF NORMAL RHR ISOLATION MOV 011 f.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REK FL GP 28 3.98E-12

.19 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT - LOS$ OF CONDENSER EVENT OCCURS 1.12E 01

!EV-LCOND FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 HARDWARE FAILURE OF N RHR MOV V022 FT0/C8 FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP

-29 3.98E 12

.19 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E-01

!EV-LCOND FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTM SLSOV1 HARDWARE FAILURE OF N RNR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF REClRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL*GP 30' 3.85E-12

.18 CONSEQUENTI AL' SGTR OCCURS 1.00E-02 OTH SGTR IN!11AT!MG EVENT - TRANSIENT WITH MFW EVENT OCCURS

,r 1.40E+00

!EV-TRANS' FAILURE OF. A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 0 1.10E-02 OTH SLSOV FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011RI COMMON CAUSE FA! LURE OF TANK LEVEL' TRANSMITTERS (IRWST, 8AT) 4.78E 04

!WX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 31 3.85E 12

.18 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR IN!TIATING EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY S10E RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSOV TRANSMITTER FAILURE 5.23E-03 CONTF01BR1 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04

!WX XMTR OPERATOR FAILS TO ACTUATE CONT. S'MP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 U

32 3.74E-12

.18 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT a TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IFV TRANS FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV MAIN GEN. 8KR ES 01 FAILS TO OPEN (# 12]

5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL $1GNAL FAILS) 1.00E-02 REN-MAN 04 33 3.38Es12

.16 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - STEAM LINE UPSTREAM OF MS!V OCCURS 3.72E 04 IEV-SLB U MSLB UPSTREAM OF MSIVs OUTSIDE CONTAINMENT 1.90E 01 OTH BL COMMON CAUSE FA! LURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT)

4. 78E - 04

!WX-XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP REC!R. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 34 2.98E 12

.14 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT - LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01

!EV LOSP FAILURE To RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 HARDWARE FA! LURE OF NORMAL RHR ISOLATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 35 2.98E-12

.14 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP j

FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS i

FAILURE OF A SECONDARY S10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 HARDWARE FAILURE OF N RNR MOV V022 FT0/C8 FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL GP 36 2.98E-12 14 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT - LOSS OF 0FFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTM ROS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SLSOV1 HARDWARE FAILukE OF N RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 37

'2.83E 12 13 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INIT! ATING EVENT LOSS OF MFW TO ONE SG EVENT DCCURS 1.92E 01 IEV LMFW1 FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 JNAVAILABILITV 0F BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE. FAILURE OF 4 SQULB VALVES IN RECIRC. likes 2.60E-05 IWX EV4 SA 38 2.83E 12 13' CONSEQUE4T! AL SGTR OCCURS T.00E-02 OTH SGTR-INITI ATING EVENT LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01 LEV-LMFW1 FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E OTW SLSOV1.

BUS UkAVAILABLE DUE TO UNSCHEDULED MAINTEEANCE 2.70E-Q3 EC1BS012TM' g-COMMON CAUSE FAILURE OF 4 SQUl0 VALVES IN REC 1RC LINES-2.60E 05 WX EV=-SA

I File: 6LCSG 03.0ES Crested: Fri Mry 24 16:20:18 1996 4

Queued Fri May 24 17:25:02 1996 Page 4 of 8 Length: 70474 bytes 39 2.74E 12

.13 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT

LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E 01 IEV LMFW FAILURE OF A SECONDARY SIDE REllEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 COMMON CAUSE FAILURE OF STEAM DUMP VALVES TO OPEN 1.50E-03 MSX AV FA COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN REClRC LINES 2.60E 05 IWX-EV4-SA 40 2.15E-12

.10 CONSEQUENTIAL SGTR DCCURS.

1.00E-02 OTH SGTR i

INITIATING EVENT LOSS OF CCW/SW EVENT OCCURS 1.44E 01 IEV LCCW j

FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSOV FAILURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011R1 l

COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX-EV4-SA 41 2.15E 12

.10 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - LOSS OF CCW/SW EVENT OCCURS 1.44E-01 IEV LCCW FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV TRANSMITTER FAILURE 5.23E 03 CDNTF01BRI COMMON CAUSE FAILURE OF 4 SOUlB VALVES IN REC 1RC LINES 2.60E 05 IWX EV4-SA 42 2.09E-12

.10 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - LOSS OF CCW/SW EVENT OCCURS 1.44E-01 IEV-LCCW FAILURE OF A SECONDARY SIDE RELIEF VALVE 70.CLOSE (Sv/PORV) 1.10E 02 OTH SLSOV MAIN GEN. 8KR' ES 01 FAILS TO OPEN [# 12]

5.08E-03 ECOM0001 COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 43 2.0$E 12

.10 INITIATING EVENT MAIN STEAM LINE STUCK OPEN SV DCCURS 1.21E 03 IEV SLB V CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR HARDWARE FAILURE OF NORMAL RHR 150LATION MOV 011 1.41E 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX FL-GP 44 2.05E 12 10 INITIATING EVENT - MAIN STEAM LINE STUCK-OPEN SV OCCURS 1.21E-03 IEV-SLB-V CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH $GTR HARDWARE FAILURE OF N RHR MOV V022 FT0/CB FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF REClRC LINES DUE 10 SUMP SCREEN PLUGGING 1.20E REX-FL-GP 45 2.05E-12~

.10 INITIATING EVENT MAIN STEAM LINE STUCK OPEN SV OCCURS 1.21E 03 IEV-SLB V CONSEQUENTIAL SCTR OCCURS 1.00E-02 OTH-SGTR HARDWARE FAILURE OF N-RHR MOV V023 FT0/CB FTC/ RELAY FTC 1.41E-02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL-GP 46 1.99E 12'

.09 CONSEQUENT!AL SGTR OCCURS-1.00E-02 OTH SGTR INITIATING EVENT

TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV UkAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC1BS001TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP REclR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 47 1.99E-12;

.09 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV BUS UNAVAILA8LE DUE TO UNSCHEDULED MA!NTENANCE

2. 70E -03 EC1BS012TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIE. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 48 1.91E-12;

.09 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITI ATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00

[EV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E-04 CCX TRNSM COMMON CAUSE FAILURE OF 4 SQUl8 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 49 1.83E.09 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTM-SGTR INITIATING EVENT

LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH-SLSOV1 FAILURE OF MAIN CONO. EVACUATIOH SYST. TO PROVIDE VACUUM 1.00E-03 CON 0 VACUUM COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 50

1. 76E - 12

.08 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 LEV-LMFW FAILURE OF A SECONDARY S10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 5.23E-03 CANTP011RI FAILURE OF AIR COMPRESSOR TRANSMITTER

. 78E IWX-XMTR COMMON CAUSE F AILURE OF TANC LEVEL TRANSMITTERS (IRWST, BAT)

OPERATOR FAILS TO ACTUATE CONT.' SUMP RECIR. (LEVEL SIGNAU FAILS) 1.00E 02 REN-MAN 04 51 1.71E 12

. 38 CONSEQUENTIAL

SGTR DCo!RS 1.00E-02 OTM-SGTR INITIATING EVENT - LOSS OF MA!N FEE 0 WATER EVENT OCCURS 3.35E IEV LMFW FAILURE OF A SECONDARY SIDE RELIEF VALVE 10 CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 MAIN GEN. 8KR ES 01 FAILS T0 OPEN [# 12]

5.08Em03 ECOM0001-COMMON CAUSE FAILURE OF TAWK LEVEL TRANSMITTERS' (IRWSti BAT) s.78E 04 '

WX XMTR

File: 6LCSG 03. DES Creeted: Fri May 24 16:20:18 1996 Page 5 of 8 Length: 70474 bytes Queued: Fri May 24 17:25:02 1996 OPERATOR FA!LS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 52 1.57E 12

.07 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01

!EV-LMFW1

]

FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SLSOV1 COMMON CAUSE FAILURE OF STEAM DUMP VALVES TO OPEN 1.50E-03 MSX-AV-F4 COMMON CAUSE FAILURE OF 4 SQUl8 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 53 1.38E-12

.06 CONSEQUENT!AL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E-01 IEV-LCONO FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SL50V1 COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/8 TO OPEN 4.90E 03 RNX KV1 Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP 54 1.35E-12

.06 CONSEQUENT!AL SGTR OCCURS 1.00E-02 OTH-SGTR INIT!ATING EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E 01 IEV-LCOND FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E-04 RE8-PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA PLUG 1.00E 02 OTH-SGTR,

55 1.278-12

.06 CONSEQUENTIAL SGTR OCCURS INITI ATING EVENT - TRANSIENT WITH MFW ? EVENT OCCURS :

T.40E+00' IEV-TRANS-i FAILURE OF A SECONDARY $10E RELIEF VALVE'70 CLOSE (SV/PORV) 1.10E-02 OTH SLSOV FIXED COMPONENTS FAILURE-3.17E-04 E04M00112 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN REClRC LINES 2.60E-05 IWX EV4 SA 56 1.27E 12

.06 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH-SLSOV FIXED COMPONENTS FAILURE 3.17E 04 ED4M0011 4

COMMON CAUSE FAILURE OF 4 SQU18 VALVES.!N RECIRC LINES 2.60E-05 IWX-EV4 SA 57 1.20E*12

.06 CONSEQUENTI AL SGTR OCCURS 1.00E 02 OTH-$GTR IN!!!ATING EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSOV BUS EDS4 DS 1 UNAVAILABLE DUE TO CORRECTIVE MAINTENANCE 3.00E-04 ED48SDS1rM COMMON CAUSE FAILURE OF 4 $0018 VALVES IN RECIRC LINES 2.60E 05 IWX-EV4-SA 58 1.20E 12

.06 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIAi!NG EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY $1DE RELIEF VALVE To CLOSE (SV/PORV) 1.10E-02 OTH SLSOV BUS 1058 05 1 UNAVAILA8LE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04*

ID88SOSITM COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN REC!RC LINES 2.60E-05

!WX EV4 SA 4

59 1.20E-12

.06 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INITIATING EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSov BUS IDS 8 DD 1 UNAVAILABLE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 ID88S001TM COMMON CAUSE FA! LURE OF 4 50018 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 60-1.20E 12

.06' CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 ofM-SLSOV 8US IDSD DS-1 UNAVAILA8LE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E-04 ID08SDS1TM COMMON CAUSE FAILURE OF 4 SQUl8 VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 61 1.20E-12

.06 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH-SGTR INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY SIDE REL1EF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH-SLSOV BUS 1D50-00 1 UNAVAILABLE DUE TO TEST OR CORkECTIVE MAINTENANCE 3.00E-04 IDDBS001TM COMMON CAUSE FAILURE OF 4 50018 VALVES IN RECIRC LINES 2.60E 05 IWX EV4-SA 62 1.11E-12

.05 CONSEQUENTI AL SGTR OCCURS 1.00E-02 OTH-SGTR INiflATING EVENT - LOSS OF CCW/SW EVENT OCCURS 1.44E-01 IEV-LCCW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV UNAVAILA81L11Y OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E-03 EC185001TM COMMON CAUSE FAILURE OF 4 $Q018 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 63 1.11E-12

.05 CONSEQUENTI AL SGTR OCCURS 1.00E 02 OTH SGTR INiflAflNG EVENT - LOSS OF CCW/SW EVENT OCCURS 1.44E-01 IEV LCCW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E- 02 GTH-SLSov BUS UNAVAILASLE DUE TO UNSCHEDULED MAINTENANCE '

2.70E-03 EC185012TM COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05, twX EV4 SA

$s.

1.10E -12

.33 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR -

NiflATING EVENT 4 IRANS!ENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS

'AILUR.E OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV)-

i.10E-02 OTH SLSOY COMMON CAUSE FAILURE OF STEAM DUMP VALVES TO OPEN 1.50E-03 MSX-AV FA

File: 6LCSG 03.0ES Created: Fri May 24 16:20:18 1996 Page 6 of 8 Length: 70474 bytes Oveued: Fri May 24 17:25:02:1996 COMMON CAUSE FAILURE OF TANK LEVEL TRANSMlffE45 (IRWST, EAT) 4.78E 04 IWX xMTR 3PERATOR F AILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 65 1.05E-12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH $GTR INITIATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E 01 IEV LMFW1 FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SLSOV1 FAILURE OF MAIN COND. EVACUAfi1N SYST. TO PROVIDE VACUUM 1.00E 03 CON 0 VACUUM COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E 05

!WX EV4-SA 66 1.04E-12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO RECOVER OFFSITE AC POWER IN 30 MINUTES 7.00E-01 OTH-ROS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH-SLSOV1 COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E-03 RNx KVI Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 rex FL-GP 67 1.02E 12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR,

!NITIATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E 01 IEV LOSP FAILURE To RECOVER OFFSitE AC POWER IN 30 MINUTES 7.00E 01 OTH-R05 FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SLSOV1

(

SUMP SCREEN 8 PLUGS AND PREVENTS FLOW 2.40E 04 REB PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW '

2.40E 04 REA PLUG 68 1.01E 12

. 05 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITI ATING EVENT TRANSIENT WlIH M!W EVENT OCCURS 1.40E+00 IEV-TRANS FA! LURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH-SLSOV COMMON CAUSE FAILURE OF SIGNAL SELECTOR GROUPS-LOGIC &l/Os 2.53E 04 CCX PLSM006 COMMON CAUSE FAILURE OF 4 50U18 VALVES IN RECIRC LINES 2.60E 05

!WX EV4-SA 69 1.01E-12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIAi!NG EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.A0E+00 IEV fRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV OPERATING BLOWER FAN HARDWARE FAILURE 2.52E 04 SWAM 0009T COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4-SA 70 1.01E-12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTM SGTR INITIATING EVENT - LOSS OF MFW TO CNE SG EVENT OCCURS 1.92E-01 IEV LMFW1 FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH-SLSOV1 FA! LURE OF AIR COMPRESSOR TRANSMITTER 5.23E 03 CANTP011Rt COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E-04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 71 1.01E-12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR l-INit!ATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01 IEV-LMFW1 l

FAILURE OF A SECONDAkY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 TRANSMITTER FAILURE 5.23E 03 SG2TF50ARI COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FA!LS TO ACTUATE CONT.' SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MAN 04 72 1.01E 12

.05 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01 IEV LMFW1 FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SLSOV1 TRAN!MITTER FAILURE 5.23E-03 CONTF01BRI COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, SAT) 4.78E-04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 73 9.79E 13

.05 CONSEQUENTIAL SGTR OCCURS 1.00E-02 otH-SGTR INITIAflNG EVENT - LOSS OF MFW TO ONE SG EVENT OCCURS 1.92E-01 IEV-LMFW1 FAILURE OF A SECONDARY S10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 MAIN GEN. BKR ES 01 FAILS TO OPEN (# 12) 5.08E 03 ECDM0001 COMMON CAUSE FA! LURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E-02 REN MAN 04 74 9.08E-13

.04 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INiflATING EVENT - LOSS OF MAIN FEE 0 WATER EVENT OCCURS 3.35E 01 LEV LMFW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (Sv/PORV) 2.10E-02 OTH SLSOV1 UNAVAILABILITY OF BUS ECS ES 1 DUE TO UNSCHEDUL MAINTENANCE 2.70E 03 EC1BS001TM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (!RWST, BAT) 4.78E-04 IWx xMTR OPERATOR FAILS TO ACTUATE CONT. SUMP RECIR. (LEVEL SIGNAL FAILS) 1.00E 02 REN MANO4 75 3.08E 13 -

.34 00NSEQUENTIAL SGTR OCCURS t.00E 02 OTH-SGTR INITI Ai!NG EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV-LMFW F AILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV).

2.10E-02 OTH SLSOV1 BUS UNAVAILABLE DUE TO UNSCHEDULED MAINTENANCE 2.70E-03 EC1BS012fM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) s.78E 04 IWX-xMTR OPERATOR FAILS TO ACTUATE CONT! SUMP RECib. (LEVEL SIGNAL FAILS 1 1.00E-32 REN MANG4 6

76 S. 74E 13 '

. 34 CONSEQUENTIAL SG1,R OCCURS-1.00E-02 3TH-SGTR

File: 6LCSG 03. DES Crested: Fri M y 24 16:20:18 1996 Page 7 of 8 Length: 70474 bytes, Gueued: Fri May 24 17:25:02 1996 INITIAf!NG EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS.

3.35E-01

!EV-LMFW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SL50V1 COMMON CAUSE FAILURE OF SENSORS IN LOW PRESSURE ENVIRONMENT 4.78E 04 CCX-TRNSM.

j COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN REclRC LINES 2.60E-05 (WX EV4 SA i

77 8.18E 13 i

.04 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INITIATING EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E 01 LEV LCOND -

FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 i

OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR -

2.90E-03 RHN-MAN 01 CD4 MON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 78 7.36E-13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR IN!T!ATING EVENT - TRANSIENT WifH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIL- 'ALVE TO CLOSE (SV/PORV) 1.10E-02 OTH-SLSOY FA! LURE OF MAIN COND. EVACUATION SYST. TO PROVIDE VACUUM 1.00E 03 CON 0 VACUUM COMMON CAUSE FAILURE OF TANK LEVEL TRANSMITTERS (IRWST, BAT) 4.78E 04 IWX XMTR OPERATOR FAILS TO ACTUATE CONT. SUMP REClR. (LEVEL SIGNAL FAILS) 1.00E-02 REN-MAN 04 79 7.26E-13 *

.03 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIAi!NG EVENT - LOSS OF CONDENSER EVENT OCCURS 1.12E 01 IEV LCONO FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH-SL50V1 l

HARDWARE FAILURE OF N RNR VALVES ON OVI LINE.A-(V 015A & 017A) 5.07E 02 RNAM0009 I

HARDWARE FAILURE OF N*RHR VALVES ON DV! LINE 8 (V 075s &.0178).

5.07E 02 RNBM0010 I

COMMON CAUSE FAILURE OF REC 1RC' LINES DUE TO SUMP SCREEN PLUGGING 1.20E-05 REX-FL GP 80 7.11E-13

.03 INITIATING EVENT - MAIN STEAM LINE STUCK-OPEN SV OCCURS 1.21E 03 IEV SL8 V CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR i

COMMON CAUSE FAILURE OF N RHR STOP CHECK VALVES V015A/B TO OPEN 4.90E-03 RNX KV1-Go COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL-GP 81 6.97E 13

.03 INITIATING EVENT MAIN STEAM LINE STUCK OPEN SV OCCURS 1.21E-03 IEV-SLB V CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR SUMP SCREEN B PLUGS AND PREVENTS FLOW 2.40E-04 REB PLUG SUMP SCREEN A PLUGS AND PREVENTS FLOW 2.40E 04 REA-PLUG 82 6.85E-13'

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR IN!T!ATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH-SLSOV FAILURE OF OUTPUT ORIVER MSS 008 1.71E 04 MSAEP508SA COMMON CAUSE rA! LURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 83 6.85E-13

.03 CONSEQUENTIAL SG1R OCCURS 1.00E 02 ofM*SGTR IN!!!AtlNG EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH SLSOV FAILURE OF OUTPUT DRIVER MSS 007 1.71E 04 MSAEPSD75A COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E 05 IWX-EV4 SA S4 6.85E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INITIAflNG EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSOV FAILURE OF OUTPUT ORIVER MSS 006 1.71E 04 MSAEPSD6SA COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 85 6.85E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY S!?E RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSOV 1

FAILURE OF OUTPUT ORIVER MSS 005

1. 71 E -04 MSAEPSDSSA

{

COMMON CAUSE FAILURE OF 4 $0U18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 86 6.85E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITIATING EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 LEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E-02 OTH-SLSOV FA! LURE OF OUTPUT DRIVER MSS 004 1.71E-04 MSAEPSD4SA COMMON CAUSE FAILURE OF 4 SQUl8 VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 87 6.85E 13

.03 CONSEQUENTIAL SGtR OCCURS 1.00E 02 OTH $GTR INITIATING EVENT TRANSIENT WifH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SLSOV FAILURE OF OUTPUT ORIVER MSS 003 1.71E 04 MSAEPS03SA COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 58 6.85E-13

.33 CONSEQUENTIAL SGTR OCCURS t.00E-02 OTM SGTR INITI ATING EVENT - TRANSIENT WITH MFW EVENT OCCURS -

1.40E+00 IEV TRANS 8AILURE OF A SECONDARY S10E' REllEF VALVE TO CLOSE (SV/PORV) 1.10E 02 oth SLSOV FAILURE OF OUTPUT DRIVER MSS 002 L.71E 04 MSAEPS02SA COMMON CAUSE F AILURE OF 4 SQUI8 VALVES IN RECIRC t!NES.

2.60E !WX-EV4 SA

$9 6-.85E-13

.03 CONSEQUENiiAL SGfR OCCURS 1.00E-02 014-SGTR'

~.

=-.-

File: 6LCSG 03. DES Created: Fri M2y 2416:20:181996 4

Ptge 8 of 8 Length: 70474 bytes Queued: Fri May 24 17:25:02 1996 INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV-TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH SL50V,

FAILURE OF OUTPUT ORIVER MSS 001 1.71E 04 MSAEPS015A COMMON CAUSE FAILURE OF 4 SQUIS VALVES IN REClRC LINES 2.60E 05 IWX EV4 SA 90 6.18E 13

.03 CONSEQUENTIAL SGTR OCCURS.

1.00E 02 OTM SGTR (NITIATING EVENT - LOSS OF CCW/SW EVENT OCCURS 1.44E 01 IEV LCCW FAILURE OF A SECONDARY S10E RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH-SLS0V-J COMMON CAUSE FAILURE OF STEAM DUMP VALVES TO OPEN 1.50E 03 MSX AV-FA

-COMMON CAJSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E 05<

IWX EV4 SA 91 6.14c-13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR 4

INITI ATING EVENT LOSS OF OFFSITE POWER EVENT OCCURS 1.20E-01 IEV LOSP FAILURE TO REC 0VER OFFSITE AC POWER IN 30 MINUTES 7.00E 01 OTH ROS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH-SL50V1 OPERATOR FAILS TO ALIGN AND ACTUATE NORMAL RHR 2.90E-03 RHN* MAN 01 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX-FL GP 92 5.89E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INITI ATING EVENT - LOSS OF COMPRESSED A14 EVENT OCCURS 3.48E 02

!EV LCAS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE' (SV) 1.00E 02 OTH-SLSov2 HARDWARE FAILURE OF NORMAL RHR ISOLAfl0N MOV 011 1.4TE 02 RN11M003 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL GP 93 5.89E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E-02 CTH SGTR INITIATING EVENT - LOSS OF COMPRESSED AIR EVENT OCCURS 3.48E-02 IEV LCAS FAILURE LF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV) 1.00E-02 OTH SL50V2 HARDWARE FAILURE OF N RHR Mov V022 FT0/C8 FTC/ RELAY FTC 1.41E 02 RN22M004 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLbGGING 1.20E-05 REX-FL GP k

94 5.89E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH SGTR INITIATING EVENT - LOSS OF COMPRESSED AIR EVENT OCCURS 3.48E 02 IEV LCAS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV) 1.00E 02 OTH SLSOV2 a

l HARDWARE FA! LURE OF N RHR MOV V023 FT0/C8 FTC/ RELAY FTC 1.41E 02 RN23M005 COMMON CAUSE FAILURE OF RECIRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05 REX FL CP 95 5.80E 13

.03: CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INIT!ATING EVENT - LOSS OF MAIN FEE 0 WATER EVENT OCCURS 3.35E 01 IEV LMFW 1

FAILURE OF A SECONDARY $10E RELIEF VALVE TO CLOSE (SV/PORV) 2.10E 02 OTH SLSOV1 FIXED COMPONENTS FAILURE 3.17E-04 E04M00112 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05

!WX EV4 SA 96 5.80E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INITIATING EVENT - LOSS OF MAIN FEEDWATER EVENT OCCURS 3.35E-01 IEV LMFW FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 2.10E-02 OTH SLSOV1 FIXED COMPONENTS FAILURE 3.17E-04 E04 MOD 11 COMMON CAUSE FAILURE OF 4 SQUIB VALVES IN RECIRC LINES 2.60E 05 IWX EV4 SA 4

97 5.65E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E 02 OTH-SGTR INITIATING EVENT - TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 IEV TR/NS FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH-SLSOV COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX-PL9M001 COMMON CAUSE FAILURE OF 4 SQUlB VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 98 5.65E 13

.03 CONSEQUENTIAL SGTR OCCURS 1.00E-02 OTH SGTR INIT!ATING EVENT - TRANS!ENT WITH MFW EVENT OCCURS 1.40E+00 IEV TRANS FAILURE OF A SECONDARY SIDE RELIEF VALVE TO CLOSE (SV/PORV) 1.10E 02 OTH-SLSOV COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PLAM001 COMMON CAUSE FAILURE OF 4 SQU18 VALVES IN RECIRC LINES 2.60E-05 IWX-EV4 SA 99 5.65E 13

.03 CONSEQUENTI AL SGTR OCCURS 1.00E-02 OTH SGTR a

!NITIATING EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E +00 IEV TRANS FAILURE OF A SECONDARY $10E RELIEF VALVE TO ClosE (SV/PORV) 1.10E-02 OTH SLSOV COMMON CAUSE FAILURE OF OUTPUT LOGIC I/Os 1.41E-04 CCX PLOM001 COMMON CAUSE FAILURE OF 4 SQU1B VALVES IN RECIRC LINES 2.60E-05 IWX EV4 SA 100 S.54E 13

.03 CONSEQUENTI AL SGTR OCCURS 1.00E-02 OTM SGTR INITIATING EVENT TRANSIENT WITH MFW EVENT OCCURS 1.40E+00 LEV TRANS FAILURE OF A SECONDARY $1DE RELIEF VALVE TO CLOSE (Sv/PORV) 1.10E 02 OTH SLSOV 8US 1050 051 UNAVAILA8LE DUE TO TEST OR CORRECTIVE MAINTENANCE 3.00E 04.

100BSDSITM COMMON CAUSE FAILURE OF REclRC LINES DUE TO SUMP SCREEN PLUGGING 1.20E 05' REX FL-GP '

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NSD-NRC-96-4742, Forwards Westinghouse Response to NRC Request for Addl Info on AP600.Encl 1 List Sequences,Will Be Discussed During PRA Meeting

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NSD-NRC-96-4742, Forwards Westinghouse Response to NRC Request for Addl Info on AP600.Encl 1 List Sequences,Will Be Discussed During PRA Meeting

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SUBJECT:

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