ML120100559

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Regulatory Conference Supporting Documentation for Apparent Violations EA-11-241 and EA-11-243, Attachment 3, Root Cause Evaluation-Plant Trip During Panel ED-11-2 Maintenance, Rev 2, Part 7.2 of 7
ML120100559
Person / Time
Site: Palisades Entergy icon.png
Issue date: 01/05/2012
From:
Entergy Nuclear Operations
To:
Office of Nuclear Reactor Regulation
Shared Package
ML1200100495 List:
References
EA-11-241, EA-11-243, PNP 2012-06 CR-PLP-2011-4822
Download: ML120100559 (46)
v • d • e


Text

A Entergy PSA EA-PSA-SDP - D11-2 07 Rev. 0

`Enteigy Engineering Appendix B - Page 6 of 10 Analysis MAAP Attach & Plot Files C PERCENT PRESSURIZER LEVEL (APPROXIMATE)

PZRLVL=(((ZW PZ-0.3247)* 14.288))

C PERCENT SIRWT LEVEL SIRWTLVL=(ZWRWST-0.4572)'14.5815 END C CALCULATE SUBCOOLING MARGIN FUNCTION TSATCR = TSAT(PPS)

SUBCM = TSAT(PPS) - TWCR SUBCMF = SUBCM

  • 1.8 END C 1 PA = 0.0001450377377 PSI FUNCTION OVERPRES = (PRB(12) - PSAT(TWRB(12)))*0.0001450377377 C 1 M = 3.28083 FT C 1 FT(pressure) = 2.30414765 PSI C 3.28083 x 2.30414765 = 7.55952 FUNCTION HPNPSHAV = (4.1148 + ZWRB(13))*7.55952 + OVERPRES FUNCTION TSAT12 = TSAT(PRB(12))*9./5.-459.7 FUNCTION SUBCOOLI = (TSAT(PRB(12)) - TWRB(12))*9./5.

C Containment Volume Averaged Gas Temperature and Pressure C Voltot = total containment volume C *

= SUM(VOLRB(i),i,1,16)

C *

= 1.64027E6 FT**3 FUNCTION VOLTOT = 1.64027E6 SUMTGR1 = TGRB(1)*711400+TGRB(3)*489900+TGRB(4)*6822 SUMTGR2 = TGRB(5)*55210+TGRB(6)*62090+TGRB(7)*84210 SUMTGR3 = TGRB(8)*43720+TGRB(9)*1884+TGRB(10)*22280 SUMTGR4 = TGRB(11)*386+TGRB(12)*75660+TGRB(13)*1364 SUMTGR5 = TGRB(14)*33930+TGRB(15)*20830+TGRB(16)*30580 SUMTGRB = SUMTGR1+SUMTGR2+SUMTGR3+SUMTGR4+SUMTGR5 TGRBTOT = (SUMTGRB/VOLTOT)*9./5.-459.7 SUMPRB1 = pRB(1)*711400+pRB(3)*489900+pRB(4)*6822 SUMPRB2 = pRB(5)*55210+pRB(6)*62090+pRB(7)*84210 SUMPRB3 = pRB(8)*43720+pRB(9)*1884+pRB(10)*22280

Entergy PSA EA - PSA-SDP - D11-2-11-07 Rev. 0

%Enter y Engineering Appendix B - Page 7 of 10 Analysis MAAP Attach & Plot Files SUMPRB4 = pRB(11)*386+prB(12)*75660+pRB(13)*1364 SUMPRB5 = pRB(14)*33930+pRB(15)*20830+pRB(16)*30580 SUMPRB = SUMPRB1+SUMPRB2+SUMPRB3+SUMPRB4+SUMPRB5 PRBTOT= (SUMPRB/VOLTOT)*0.0001450377377 END PARAMETER CHANGE END PARAMETER CHANGE C attach file for all Palisades runs C PLOTS PLOTFIL 88 WHPIXX

// GENESF HPSI FLOW WLPI1X

// GENESF LPSI FLOW WSPAXX

// GENESF UPPER COMPT SPRAY FLOW ZWRWST

// water level in refueling water storage tank WESFDC flow rate of ESF water to downcomer nodes WESFCL flow rate of ESF water to cold leg nodes PQT

// pressure in quench tank TWQT temperature of water in quench tank MH2QT1 mass of H2 in quench tank PACUM

// pressure in accumulator END PLOTFIL 90

//

PPZ

// pressure in pressurizer ZWPZ

// collapsed water level in pressurizer TWCR

// core water temperature SUBCMF

// subcooling margin (TSATCR - TWCR) in F ZWBS

// collapsed water level in broken S/G downcomer PBS

// pressure in broken S/G TWBS

// temperature of water in broken S/G END PLOTFIL 92

//

ZWBS

// collapsed water level in broken S/G downcomer PBS pressure in broken S/G ZWUS

// collapsed water level in unbroken S/G downcomer PUS

// pressure in unbroken S/G

A Entergy PSA EA-PSA-SDP-D11 11-07 Rev. 0

`Entergy Y

Engineering Appendix B - Page 8 of 10 Analysis MAAP Attach & Plot Files TWBS temperature of water in broken S/G TWUS

// temperature of water in unbroken S/G END PLOTFIL 93

//

WWFWBS

// FEEDWATER, INCLUDING AUX FEED, TO BROKEN S/G WWFWUS

// FEEDWATER, INCLUDING AUX FEED, TO UNBROKEN S/G WSTTDB

// FEEDWATER TURBINE EXTR STEAM WSTTDU

// FEEDWATER TURBINE EXTR STEAM average WGBST flow B S/G relief, safety, MSIVs (gas) average WGUST flow U S/G relief, safety, MSIVs (gas)

WGBST

// flow B S/G relief, safety, MSIVs (gas)

WGUST

// flow U S/G relief, safety, MSIVs (gas)

END C Flag For Determining when PZR Sprays Turn On WHEN TIM > 0.

PZRSPRAY = 0.

END PLOTFIL 94 TSATCR // saturation temperature at primary system pressure SUBCM

// saturation temperauter - core water temperature SUBCMF // subcooling margin in degrees F ZWBS

// collapsed water level in broken S/G downcomer ZWUS

//collapsed water level in unbroken S/G downcomer ZWPZ

// collapsed water level in pressurizer WWFWBS // MFW including AFW, TO broken S/G WWFWUS MFW including AFW, TO unbroken S/G PSPDBSG // Primary-Secondary Pressure Differential, BROKEN SG PSPDUSG // Primary-Secondary Pressure Differential, UNBROKEN SG VDOTCHP // Volumetric Flow Rate in GPM for Charging Pumps VDOTHPI // Volumetric Flow Rate in GPM for HPSI Pumps VDOTLPI // Volumetric Flow Rate in GPM for LPSI Pumps OVERPRES // overpressure of containment compartment 13 HPNPSHAV // average NPSH availible at the HPSI pump TSAT12

// saturation temperature of containment compartment 13 SUBCOOLI

// amount of subcooling of containment compartment 13

Entergy PSA EA -PSA-SDP-D11-2-11-07 Rev. 0 Enter y Engineering Appendix B - Page 9 of 10 Analysis MAAP Attach & Plot Files MWCSTO

// mass of water in CST Tank ZWRWST

//water level of CST Tank TGRBTOT // volume averaged containment gas temperature PRBTOT volume averaged containment pressure BSGLVL

% S/G Water Level in Broken USGLVL // % S/G Water Level in Unbroken PZRLVL // % PZR Water Level SIRWTLVL // % SIRWT Water Level END PLOTFIL 95 TCRHOT

// Peak Core Temperature

( mass averaged over matl in node)

PPS

// PCS Pressure TWHPS

// Temperature of water in the hot leg TWLPS

// Temperature of water in the cold leg TWPS

// Average temperature of water in the primary system WWFWUS

//Total FW (main or aux) to the unbroken steam generators, LB/HR WWFWBS

//Total FW (main or aux) to the broken steam generators, LB/HR VAFWB Feedwater Volumetric Flow Rate (MFW & Aux) to broken S/G GPM VAFWU Feedwater Volumetric Flow Rate (MFW & Aux) to unbroken S/G GPM ZWUS

// Collapsed water level in unbroken SG downcomer ZWBS

// Collapsed water level in broken SG downcomer WWBST

// Total water flow through the broken SG relief valves, safety valves, and the main steam line (includes the MSLB flow)

WGBST

// Total gas flow through the broken SG relief valves, safety valves, and the main steam line (includes MSLB flow)

WGUST

// Total gas flow through the broken SG relief valves, safety valves, and the main steam line (includes MSLB flow)

MWCSTO

// Mass of Water in Condensate(CST)& PCS Makeup Storage Tank (T-2)

ZWRWST

//water level of CST Tank BSGLVL

/1% S/G Water Level in Broken USGLVL

/1% S/G Water Level in Unbroken PZRLVL

// % PZR Water Level SIRWTLVL // % SIRWT Water Level WSTRV

// Total flow of steam through the pressurizer valves WGRV

// Combined flow rate of gas out of pressurizer through relief valves and safety valves WWRV

// Total water flow through the pressurizer relief valves and safety valves

Entergy PSA EA-PSA-SDP-D11 11-07 Rev. 0

-EntieW Engineering Appendix B - Page 10 of 10 Analysis MAAP Attach & Plot Files VDOTCHP

// Volumetric Flow Rate in GPM for Charging Pumps VDOTHPI

//Volumetric Flow Rate in GPM for HPSI Pumps VDOTLPI

//Volumetric Flow Rate in GPM for LPSI Pumps VDOTSPA

//Spray 54-A Volumetric Flow Rate in GPM VDOTSPB

// Spray 54-B Volumetric Flow Rate in GPM VDOTSPC

//Spray 54-C Volumetric Flow Rate in GPM PRB(1 )

// Crane to Dome - North and South

( corresponding to GOTHIC nodes 1 & 2) pressure TGRB(1)

//Crane to Dome - North and South (corresponding to GOTHIC nodes 1& 2) gas temp VMWCST

// Volume of Remaining Water in Condensate Storage Tank (T-2)& PCS Makeup Storage Tank (T-81)

ZWCST

// CST Level ZWCPS

// Collapsed Water Level in the Primary System Relative to the Bottom of the Vessel END

Ift

=

Entergy PSA En ineerin EA-PSA-SDP-D11-2-11-07 Rev. I EnteW g

g Analysis 6 - Page 1 of 1 6 Event Trees 112.11111-TR-MCND Figure A06-1:

Transient with Loss of Main Condenser (TR-MCND)

XFR-SBLOCA-SRV Figure A06-2:

Transfer to Loss of Coolant Accident via Pressurizer Safety Relief Valve(s) (XFR-SBLOCA-SRV)

XFR-A1WS Figure A06-3:

Transfer to Anticipated Transient Without SCRAM (XFR-ATWS)

TR-MCND - LOSS OF MAIN CONDENSER VACUUM I END-STATE-NAMES 1

OK 2

OK 3

OK 4

OK 5

CORE-DAMAGE 6

CORE-DAMAGE

]

I^! CORE-DAMAGE 6

CORE-DAMAGE 9

OK 10 OK 11 OK 12 CORE-DAMAGE 11 CORE-DAMAGE 14 CORE-DAMAGE 15 CORE-DAMAGE 16 OK 1]

CORE-DAMAGE 18 CORE-DAMAGE 16 CORE-DAMAGE 20 CORE-DAMAGE 21 T

1 XFR-SBLOCASRV 22 T

2 XFR-ATWS 2011/11/16 Page 56 Rex^ivityCUnwl Consequenfal Secemtlary Curli ng Rdary Coo ng ILCantl Vacuum ShutdownC oling Long Term PORV HPSl Injection HPSI lnjeclon C

nmenl LOCH HighP essure L

Pressure Secondary Ccol ng Once Through Cooling SIRWT Sump Dec rc H

r Removal IE LOMC RXC CONS LOCH FT 2HP 2LP MC SD 2LT PORV HPSISI HPSI-REC CAR

Challelge to Pressurizer Secondary P

ssun Safely Charging HPSI Injection Safely Rel'Dl Valve -

Cooling Relief Valves Closure (2/3 Chargmg Pumps SIRWT Potential SWCk Open HiPress (Given Stearn ar Sesetl on MMP runs)

PZR SRV SBLOCA Water Relief)

IE_SRV-SMLOCA 2HP PZR-SAFETIES-FTC CHRG HPSISI Shuttlown Coolng Secontlary HPSl Injection PORVe HPSI (requres DC rcovery Cooing SIRWT Once Thru Injection Can/anmenl Heal for ADVS)

Long Tenn Cooling RAG Removal SD 2LT HPSI-SI PORV HPSI-REC CHR a

END-STATE-NAMES 1

OK 2

CORE-DAMAGE 3

OK 4

CORE-DAMAGE 5

CORE-DAMAGE s

CORE-DAMAGE 7

CORE-DAMAGE R

OK 9

CORE-DAMAGE 10 CORE-DAMAGE 11 OK 12 CORE-DAMAGE 13 CORE-DAMAGE 14 CORE DAMAGE 15 CORE-DAMAGE 16 OK 10 CORE-DAMAGE 18 CORE-DAMAGE XFR-SBLOCA-SRV - PZR SAFETY SPURIOUS OPENING INDUCED SMALL BREAK LOCA (TRANSFER EVENT TREE) 19 CORE-DAMAGE 20 CORE-DAMAGE 2012/01/05 Page 1

Electrical Scram Mechanical Scram Turbine Pressurizer Signal Faults Faults Trip Safeties Open IE_ATWS RXC-ELEC-FAULTS RXC-MECH-FAULTS TTF RVO Negative Pressurizer Emergency Boration Moderator Safeties 1 Charging Pump Coefficient Closed MTC RVC CHRGWIPP EN 1

OK 2

OK 3

CORE-DAMAGE 4

1 CORE-DAMAGE 5

CORE-DAMAGE 6

CORE-DAMAGE 7

OK 8

CORE-DAMAGE 9

CORE-DAMAGE 10 CORE-DAMAGE 11 CORE-DAMAGE 12 OK 13 CORE-DAMAGE 14 CORE-DAMAGE 15 CORE-DAMAGE XFR-ATWS - ANTICIPATED TRANSIENT W/O SCRAM (TRANSFER EVENT TREE) 16 CORE-DAMAGE 2005/03/30 Page 2

Entergy PSA N'Ente^gy Engineering Analysis 7:

Change Sets EA-PSA-SDP-D11 11-07 Rev. 1 7 - Page 1 of 4 Table A07-1 : Change Sets for SAPHIRE Project : PSAR2C (D11-2)

Change/Flag Set Event Calc.

T e

Prob/Freq Description 0_BASE SET TRIP CHARGING PUMP HEP TO 0 FOR CONSISTENCY WITH PSAR2C G-PMOA-TRIP-PUMP I

0.00E+00 OPERATOR FAILS TO TRIP CHARGING PUMP(S) PRIOR TO CHALLENGING PZR SRVS 0-BYPASS-REG-FIX P-CBOB-BYREG 1

1.70E-02 SET P-CBOB-BYREG HEP TO 1.7E-2 VICE 0.5 FOR CONSISTENCY WITH HRA WHEN "TRUE" OP RECOVERY OF THE BYPASS REG IS CREDITED 0_D11-2 EVENT RECO 09/25/2011 D11-2 FAULT EVENT WITH RECOVERIES APPLIED A-PMME-P-8B 1

1.53E-02 AFW TURBINE PUMP P-8B FAILS TO START (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

D-BCMT-ED-15 1

1.00E+00 BATTERY CHARGER #1 FAILS TO FUNCTION (EVENT CONSEQUENTIAL FAILURE)

D-BCMT-ED-17 1

1.00E-01 BATTERY CHARGER #3 FAILS TO FUNCTION (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

D-CBMC-72-119 1

1.00E+00 72-119 DC BREAKER FAILS TO REMAIN CLOSED (EVENT CONSEQUENTIAL FAILURE)

D-HSE-CHGR3-INS D-HSMC-HS-72-01 G-PMOA-TRIP-PUMP T

1 1

1.00E-01 6.80E-03 SET TO'T'- CHARGER #3 IN SERVICE HAND SWITCH 72-01 FAILS TO REMAIN CLOSED (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

OPERATOR FAILS TO TRIP CHARGING PUMP(S) PRIOR TO CHALLENGING PZR SRVS M-OOOT-LPF-INIT T

1.00E+00 OP FAILS TO SUPPLY CONDENSATE TO DEPRESSURIZED S/G (LP FEED)

(EVENT CONSEQUENTIAL FAILURE -SURROGATE FOR RECOVERY HEP - NO RECOVERY)

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 E

Engineering nte^gy Analysis 7 - Page 2 of 4 Table A07-1: Change Sets for SAPHIRE Project : PSAR2C(D1 1-2)

Change/Flag Set Event Tal Prob/Freq Description e

P-BlMK-EA-13 1

2.60E-03 FAULT ON BUS 1E (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

P-PAMK-EY-10 1

3.30E-02 FAULT ON 120V PREFERRED AC BUS Y10 (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

P-PAMK-EY-30 1

1.00E-01 FAULT ON 120V PREFERRED AC BUS Y30 (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP) 0_D11-2-EVENT-REC1 09/25/2011 D11-2 FAULT EVENT WITH RECOVERIES APPLIED A-PMME-P-8B 1

1.05E-01 AFW TURBINE PUMP P-8B FAILS TO START (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

D-BCMT-ED-15 1

1.00E+00 BATTERY CHARGER #1 FAILS TO FUNCTION (EVENT CONSEQUENTIAL FAILURE)

D-BCMT-ED-17 1

1.00E-01 BATTERY CHARGER #3 FAILS TO FUNCTION (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

D-CBMC-72-119 1

1.00E+00 72-119 DC BREAKER FAILS TO REMAIN CLOSED (EVENT CONSEQUENTIAL FAILURE)

D-HSE-CHGR3-INS T

SET TO'T'- CHARGER #3 IN SERVICE D-HSMC-HS-72-01 1

1.00E-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

G-PMOA-TRIP-PUMP 1

6.80E-03 OPERATOR FAILS TO TRIP CHARGING PUMP(S) PRIOR TO CHALLENGING PZR SRVS M-OOOT-LPF-INIT T

1.00E+00 OP FAILS TO SUPPLY CONDENSATE TO DEPRESSURIZED S/G (LP FEED)

(EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP - NO RECOVERY)

P-BlMK-EA-13 1

2.60E-03 FAULT ON BUS 1E (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

nteW Entergy PSA Engineering Analysis EA-PSA-SDP-D11 11-07 Rev. 1 7 - Page 3 of 4 Table A07-1: Change Sets for SAPHIRE Project: PSAR2C(D11-2)

Change/Flag Set Event P-PAMK-EY-10 Caic.

Type 1

Prob/Freq 1.00E-01 Description FAULT ON 120V PREFERRED AC BUS Y10 (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP)

P-PAMK-EY-30 1

1.00E-01 FAULT ON 120V PREFERRED AC BUS Y30 (EVENT CONSEQUENTIAL FAILURE - SURROGATE FOR RECOVERY HEP) 0_IE-SET SET IE LOMC (LOSS OF MAIN CONDENSER) TO 1 IE LOMC 1

1.00E+00 (EVENT CONSEQUENTIAL FAILURE) 0_PRE-EVENT_EOOS P-CBMB-252-302 T

09/25/2011 PRE-D11-2 FAULT EVENT EQUIPMENT OUT OF SERVICES CIRCUIT BREAKER 252-302 FAILS TO CLOSE (OUT OF SERVICE PRIOR TO EVENT)

P-CBMC-252-302 T

CIRCUIT BREAKER 252-302 FAILS TO REMAIN CLOSED (OUT OF SERVICE PRIOR TO EVENT)

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 N'

Engineerin Ente^

g gy Analysis 7 - Page 4 of 4 Table A07-2 : Change Sets Applied to Each Endstate Endstate :

0_LOMC_BASE 0_LOMC_D11-2_RECO 0 LOMC D11-2 REC1 Change Sets :

HEVENTS(LGCLS-NRML-CNF)

HEVENTS(LGCLS-NRML-CNF)

HEVENTS(LGCLS-NRML-CNF) 0_BYPASS_REG_FIX 0_BYPASS_REG_FIX 0 BYPASS REG FIX 0_PRE-EVENT_EOOS 0 PRE-EVENT_EOOS 0 PRE-EVENT EGOS 0_IE_SET 0_IE_SET 0

IE SET 0_BASE 0_D1 1-2_EVENT_RECO 0

D11-2 EVENT REC1

v Entergy PSA Engineerin EA -PSA-SDP-D11-2 07 Rev. 1 Entmy g

Analysis 8 - Page 1 of 28 8:

Cutsets Note: Entire table is changed from Revision 0 - revision bars omitted for editorial reasons.

Top 100 cut sets Project

PSAR2C( D11-2)

End State : 0 LOMC D11-2 RECO Min Cut Upper Bound :

6.445E-006 This Partition:

3.426E-006 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

1 17.15

17. 15 1.11E-06 IE_LOMC 1.00E+00 MTC2 PERCENTAGE OF TIME W/MTC NOT SUFFICIENTLY POSITIVE 2.30E 01

/RVO Pressurizer Safeties Open 9.99E-01 RXC-ELEC-FAULTS Electrical Scram Signal Faults 4.81 E-06 2

25.28 8.13 5.24E-07 IE_LOMC 1.00E+00 G-PMOE-P-55ABC OPERATOR FAILS TO INITIATE CHARGING FLOW 1.10E-01

/RVC Pressurizer Safeties Closed 9.91E-01

/RVO Pressurizer Safeties Open 9.99E-01 RXC-ELEC-FAULTS Electrical Scram Signal Faults 4.81 E-06 3

27.73

2. 45 1.58E-07 IE_LOMC 1.00E+00 A-PMCC-PBABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05

Entegy Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 2 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 4

29.14 1.41 9.06E-08 IE LOMC 1.00E+00 G-PMOE-P-55ABC OPERATOR FAILS TO INITIATE CHARGING FLOW 1.10E-01

/RVC Pressurizer Safeties Closed 9.91 E-01

/RVO Pressurizer Safeties Open 9.99E-01

/RXC-ELEC-FAULTS Electrical Scram Signal Faults 1.00E+00 RXC-MECH-FAULTS Mechanical Scram Faults 8.40E-07

/TTF Turbine Trip 9.90E-01 5

30.21 1.07 6.90E-08 IE_LOMC 1.00E+00 A-AVOA-MISCALADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FLOW INSTRUMENT MISC 1.45E-03 A-ISOH-AFW-HDR3 MISCALIBRATION OF ALL FLOW INSTRUMENTS ON ALL HEADERS 1.30E-04 H-ZZOA-OTC-CDTNL-HEP-2 COND HEP: A-AVOA-AFWFLADJ

  • B-XVOB-ADVS-MAN
  • H -

ZZOA-OTC-I N IT 3.66E-01 6

30.85 0.64 4.14E-08 IE_LOMC 1.00E+00 RVC Pressurizer Safeties Closed 8.61 E-03

/RVO Pressurizer Safeties Open 9.99E-01 RXC-ELEC-FAULTS Electrical Scram Signal Faults 4.81 E-06 7

31.48 0.63 4.06E-08 IE LOMC 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 B-XVOB-ADVS-MAN OPERATOR FAILS TO CLOSE MANUAL VALVES TO CLOSE ADV 4.03E-02 H-ZZOA-OTC-CDTNL-HEP-4 COND HEP: B-XVOB-ADVS-MAN

  • H-ZZOA-OTC-INIT 1.85E-02 8

32.01 0.53 3.43E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03

=

Entergy PSA En ineerin EA-PSA-SDP-D11-2-11-07 Rev. 1 Ente^gy g

g Analysis 8 - Page 3 of 28 Table A08-1: Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-RVMA-PRV-1043B PRV-1043B POWER OPERATED RELIEF VALVE FAILS TO OPEN 9.29E-03 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 9

32.54 0.53 3.43E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-RVMA-PRV-1 043B PRV-1043B POWER OPERATED RELIEF VALVE FAILS TO OPEN 9.29E-03 X-HSE-SGA-BLDN SET TO 'T' - ESDE ON SG E-50A (House Event) 1.00E+00 10 33.04 0.5 3.24E-08 IELOMC 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 O-RVCC-PORVS-MA COMMON CAUSE FAILURE OF BOTH PORVS TO NOT OPEN 5.95E-04 11 33.53 0.49 3.17E-08 IE_LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 U-FLOC-BS-1318&19&20-PLU CCFAIL OF SWS DISCHARGE BASKET STRAINERS 1318 &

1319 & 1320 PLUGGING 4.66E-06 12 34.01 0.48 3.09E-08 IE_LOMC 1.00E+00

O Entergy PSA EA-PSA-SDP-D11-2 07 Rev. 1 Engineerin Enter g

gy Analysis 8 - Page 4 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

A-CVCC-AFWPP3-MA ALL 3 AFW PP CK VALVES CK-FW726 1.07E-05 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 13 34.47 0.46 2.97E-08 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Y-PMCC-P8C66ABME COMMON CAUSE FAILURE OF P-8C 5.10E-05 14 34.92 0.45 2.89E-08 IE_LOMC 1.00E+00 A-AVOA-MISCALADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FLOW INSTRUMENT MISC 1 A5E-03 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 H-ZZOA-OTC-CDTNL-HEP-2 COND HEP: A-AVOA-AFWFLADJ

  • B-XVOB-ADVS-MAN
  • H-ZZOA-OTC-INIT 3.66E-01 15 35.37 0.45 2.89E-08 IE LOMC 1.00E+00 A-AVOA-AFWFLADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FAILURE OF ONE HDR 1.45E-03 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 H-ZZOA-OTC-CDTNL-HEP-2 COND HEP: A-AVOA-AFWFLADJ
  • B-XVOB-ADVS-MAN
  • H-ZZOA-OTC-IN IT 3.66E-01 16 35.76 0.39 2.51E-08 IE_LOMC 1.00E+00 A-CVCC-AFWINJ-MA ALL 4 AFW INJ CHECK VALVES FTO DUE TO COMMON CAUSE 8.65E-06 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 17 36.14 0.38 2.45E-08 IE_LOMC 1.00E+00 A-AVOA-MISCALADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FLOW INSTRUMENT MISC 1.45E-03

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1

=^

Engineerin Ente^

g gy Analysis 8 - Page 5 of 28 Table A08-1

Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

A-ISOH-AFW-HDR3 MISCALIBRATION OF ALL FLOW INSTRUMENTS ON ALL HEADERS 1.30E-04 H-ZZOA-OTC-CDTNL-HEP-3 COND HEP: A-AVOA-MISCALADJ

  • M-OOOT-LPF-INIT
  • H-ZZOA-OTC-INIT 5.44E-01 M-OOOT-LPF-CDTNL-HEP-1 COND HEP: A-AVOA-MISCALADJ
  • M-OOOT-LPF-INIT
  • H-AVOA-HPISUBCLG 2.39E-01 18 36.52 0.38 2.42E-08 IE_LOMC 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 Y-AVMD-CV-3056 AIR OPERATED VALVE CV-3056 FAILS TO REMAIN OPEN 4.44E-04 19 36.9 0.38 2.42E-08 IE_LOMC 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 Y-AVMD-CV-3027 AIR OPERATED VALVE CV-3027 FAILS TO REMAIN OPEN 4.44E-04 20 37.26 0.36 2.34E-08 IE_LOMC 1.00E+00 A-AVCC-AFW-4-MA ALL 4 AFW AOV'S CCAUSE FTO CV-0727/CV-0736/CV-0736A/CV-0749 8.06E-06 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 21 37.6 0.34 2.20E-08 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PSOH-AFWLOSUC MISCALIBRATION OF ALL AFW LOW SUCTION PRESSURE SWITCHES 1.30E-04 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 22 37.93 0.33 2.16E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

Entergy PSA EA-PSA-SDP -D11-2 07 Rev. 1 Engineering Ente^gy Analysis 8 - Page 6 of 28 Table A08-1

Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE 1.00E-01 O-MVMA-MO-1043A MOTOR OPERATED VALVE MO-1043A FAILS TO OPEN 5.85E-03 X-HSE-SGB-BLDN SET TO 'T' - ESDE ON SG E-50B (House Event) 1.00E+00 23 38.26 0.33 2.16E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-MVMA-MO-1043A MOTOR OPERATED VALVE MO-1043A FAILS TO OPEN 5.85E-03 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 24 38.59 0.33 2.12E-08 IE_LOMC 1.00E+00 A-OOOT-CSTMK-CDTNL-HEP-2 COND HEP: L-ZZOA-SDC-INIT

  • A-OOOT-CSTMKUP
  • P-CBOB-BUS1E 1.43E-01 A-PMME-P-936 H-ZZOA-OTC-INIT P-936 FAILS TO START OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 3.29E-03 2.90E-03 25 38.89 0.3 1.96E-08 L-ZZOA-SDC-INIT IE LOMC OPERATOR FAILS TO INITIATE SDC 1.55E-02 1.00E+00 A-AVOA-AFWFLADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FAILURE OF ONE HDR 1.45E-03 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 N'

En ineerin Ente^

g g

gy Analysis 8 - Page 7 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

H-ZZOA-OTC-CDTNL-HEP-2 COND HEP: A-AVOA-AFWFLADJ

  • B-XVOB-ADVS-MAN
  • H-ZZOA-OTC-INIT 3.66E-01 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 26 39.19 0.3 1.96E-08 IELOMC 1.00E+00 A-AVOA-AFWFLADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FAILURE OF ONE HDR 1.45E-03 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 H-ZZOA-OTC-CDTNL-HEP-2 COND HEP: A-AVOA-AFWFLADJ
  • B-XVOB-ADVS-MAN
  • H-ZZOA-OTC-INIT 3.66E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 27 39.48 0.29 1.89E-08 IE LOMC 1.00E+00 A-PMCC-P8ABC-MG COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO RUN 6.53E-06 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 28 39.77 0.29 1.87E-08 IE_LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 U-FLCC-TRAV-SCRN COMMON CAUSE FAILURE OF TRAVELING SCREENS 2.75E-06 29 40.05 0.28 1.81 E-08 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 En ineerin v Ente^

g g

gy Analysis 8 - Page 8 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

O-RVMA-PRV-10436 PRV-1043B POWER OPERATED RELIEF VALVE FAILS TO OPEN 9.29E-03 30 40.33 0.28 1.78E-08 IE-LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 U-PMCC-P-7ABC-MG P-7A & P-7B & P-7C FAIL TO RUN DUE TO COMMON CAUSE 2.61E-06 31 40.59 0.26 1.67E-08 IE-LOMC 1.00E+00 A-OOOT-CSTMK-CDTNL-HEP-2 COND HEP: L-=OA-SDC-INIT

  • A-OOOT-CSTMKUP
  • P-CBOB-BUS1 E 1.43E-01 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 L-ZZOA-SDC-INIT OPERATOR FAILS TO INITIATE SDC 1.55E-02 P-BlMK-EA-13 FAULT ON BUS 1E 2.60E-03 32 40.85 0.26 1.66E-08 IE-LOMC 1.00E+00 MTC1 PERCENTAGE OF TIME W/MTC NOT SUFFICIENTLY POSITIVE 2.00E-02

/RVO Pressurizer Safeties Open 9.99E-01

/RXC-ELEC-FAULTS Electrical Scram Signal Faults 1.00E+00 RXC-MECH-FAULTS Mechanical Scram Faults 8.40E-07

/TTF Turbine Trip 9.90E-01 33 41.1 0.25 1.64E-08 IELOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 R-REMD-TX-4 RELAY TX-4 FAILS TO REMAIN DE-ENERGIZED 6.52E-03 W-RVMB-RV-1039 PZR SAFETY VALVE RV-1039 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 34 41.35 0.25 1.64E-08 IE LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR 6.80E-03

i`

Entergy PSA En ineerin EA-PSA-SDP-D11-2-11-07 Rev. 1 Entergy g

g Analysis 8 - Page 9 of 28 Table A08 - 1: Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

SRVs P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 R-REMD-TVX-4 RELAY TVX-4 FAILS TO REMAIN DE-ENERGIZED 6.52E-03 W-RVMB -RV-1039 PZR SAFETY VALVE RV-1039 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 35

41. 6 0.25 1

. 64E-08 IE_LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump ( s) prior to challenging PZR SRVs 6.80E-03 P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 R-REMD-TX-4 RELAY TX-4 FAILS TO REMAIN DE-ENERGIZED 6.52E-03 W-RVMB-RV-1040 PZR SAFETY VALVE RV-1040 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 36 41.85 0. 25 1.64E-08 IELOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump ( s) prior to challenging PZR SRVs 6. 80E-03 P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 R-REMD-TVX-4 RELAY TVX-4 FAILS TO REMAIN DE-ENERGIZED 6.52E-03 W-RVMB-RV-1040 PZR SAFETY VALVE RV-1040 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 37 42.1 0.25 1.64E-08 IE_LOMC 1.00E+00 G-PMOA-TRIP -PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 R-REMD-TX -4 RELAY TX-4 FAILS TO REMAIN DE-ENERGIZED 6.52E-03 W-RVMB -RV-1 041 PZR SAFETY VALVE RV-1041 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 38 42. 35 0.25 1.64E-08 IE_LOMC 1.00E+00 G-PMOA -TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 Engineerin Ente^

g gy Analysis 8 - Page 10 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 R-REMD-TVX-4 RELAY TVX-4 FAILS TO REMAIN DE-ENERGIZED 6.52E-03 W-RVMB-RV-1041 PZR SAFETY VALVE RV-1041 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 39 42.6 0.25 1.63E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGB-BLDN SET TO 'T' - ESDE ON SG E-50B (House Event) 1.00E+00 Y-AVMB-CV-3056 SIRWT RECIRC VALVE CV-3056 FTC 4.42E-03 40 42.85 0.25 1.63E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-1 7 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 Y-AVMB-CV-3056 SIRWT RECIRC VALVE CV-3056 FTC 4.42E-03 41 43.07 0.22 1.45E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00

A Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. I Engineering Analysis 8 - Page 11 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS X-HSE-SGA-BLDN OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

SET TO 'T' - ESDE ON SG E-50A (House Event) 1.00E-01 1.00E+00 Y-KVMB-SV-3056B SIRWT RECIRC VALVE SOLENOID SV-3056B FTE 3.93E-03 42 43.29 0.22 1.45E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-1 5 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 CMOE IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 Y-KVMB-SV-3056B SIRWT RECIRC VALVE SOLENOID SV-3056B FTE 3.93E-03 43 43.51 0.22 1.45E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGA D-BCMT-ED-15 ONE SAFETY RELIEF VALVE ON SG A FTC BATTERY CHARGER #1 FAILS TO FUNCTION 3.69E-03 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 Z-KVMB-SV-3029A SUMP TO EAST ESS AIR SUPPLY SV-3029A FTE 3.93E-03 44 43.73 0.22 1.45E-08 IE LOMC 1.00E+00

Entergy PSA EA -PSA-SDP -D11-2-11-07 Rev. 1 m

Engineering Ente^gy Analysis 8 - Page 12 of 28 Table A08-1 : Top 100 Cuts ets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGB-BLDN SET TO T' - ESDE ON SG E-50B (House Event) 1.00E+00 Z-KVMB-SV-3029B SUMP TO EAST ESS AIR SUPPLY SV-3029B FTE 3.93E-03 45 43.95 0.22 1.45E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 Z-KVMB-SV-3029B SUMP TO EAST ESS AIR SUPPLY SV-3029B FTE 3.93E-03 46 44.17 0.22 1.45E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE 1.00E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00

Enter y Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 13 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

Z-KVMB-SV-3029A SUMP TO EAST ESS AIR SUPPLY SV-3029A FTE 3.93E-03 47 44.39 0.22 1.45E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 Y-KVMB-SV-3056A SIRWT RECIRC VALVE SOLENOID SV-3056A FTE 3.93E-03 48 44.61 0.22 1.45E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 Y-KVMB-SV-3056A SIRWT RECIRC VALVE SOLENOID SV-3056A FTE 3.93E-03 49 44.83 0.22 1.42E-08 IE_LOMC 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 Y-AVOB-RAS-VLVS OPERATOR FAILS TO ENABLE ESS RECIRC VALVES TO CLOSE ON RAS 2.60E-04 50 45.05 0.22 1.40E-08 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02

'_=

Entergy PSA En ineerin EA-PSA-SDP-D11-2 07 Rev. 1 Ente^gy g

g Analysis 8 - Page 14 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 P-BIMK-EA-12 FAULT ON BUS 1D 2.40E-06 51 45.27 0.22 1.40E-08 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 P-REMD-127-8-X1 RELAY 127-8-X1 FAILS TO REMAIN DE-ENERGIZED 2.40E-05 52 45.49 0.22 1.40E-08 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 P-REMD-127-2-X2 RELAY 127-2-X2 FAILS TO REMAIN DE-ENERIZED 2.40E-05 53 45.71 0.22 1.40E-08 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 D-BCMT-ED-17 BATTERY CHARGER #1 FAILS TO FUNCTION BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E+00 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 P-REMD-162-154 RELAY 162-154 FAILS TO REMAIN DE-ENERGIZED 2.40E-05 54 45.93 0.22 1.40E-08 IELOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. I Engineerin Enter g

gy Analysis 8 - Page 15 of 28 Table A08-1: Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

D-BCMT-ED-1 5 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 P-REMD-162-154X1 RELAY 162-154-X1 FAILS TO REMAIN DE-ENERGIZED 2.40E-05 55 46.15 0.22 1.40E-08 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 R-REMD-194-211 LOAD SHED RELAY 194-211 FTRD 2.40E-05 56 46.36 0.21 1.34E-08 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8A AFW PUMP P-8A OUT OF SERVICE 4.52E-03 Y-PMCC-P8C66ABME COMMON CAUSE FAILURE OF P-8C 5.10E-05 57 46.56 0.2 1.29E-08 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-FUMK-D028-1 FUSE (FUZ/D028-1) TO PANEL D21A FAILED OPEN 2.21E-05 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 58 46.75 0.19 1.23E-08 IE LOMC 1.00E+00 A-REMA-SSX-3P8AB AFW A/B INJECTION VALVES OPEN RELAY SSX-3/P8A/B FTD 2.41E-04 Y-PMCC-P8C66ABME COMMON CAUSE FAILURE OF P-8C 5.10E-05

"Entff Entergy PSA Engineering Analysis EA-PSA-SDP-D11 11-07 Rev. 1 8 - Page 16 of 28 Table A08-1

Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

59 46.94 0.19 1.20E-08 IE LOMC 1.00E+00 A-AVOA-CV-201 0 OPERATOR FAILS TO OPEN CV-2010 FOR T-939 MAKEUP TO CST 2.59E-03 A-OOOT-CSTMK-CDTNL-HEP-1 COND HEP: A-AVOA-CV-2010

  • A-OOOT-CSTMKUP
  • Y-AVOB-RAS-VLVS 4.99E-01 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-RVMA-PRV-1043B PRV-1043B POWER OPERATED RELIEF VALVE FAILS TO OPEN 9.29E-03 60 47.12 0.18 1.17E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-LMMC-HS-1043A LIMIT SWITCH POS-L FAILS TO REMAIN CLOSED 3.17E-03 X-HSE-SGB-BLDN SET TO 'T' - ESDE ON SG E-50B (House Event) 1.00E+00 61 47.3 0.18 1.17E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE 1.00E-01

da Entergy Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 17 of 28 ame Fwu-7:

i op 1 uu Outs ets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

O-LMMC-HS-1043A LIMIT SWITCH POS-L FAILS TO REMAIN CLOSED 3.17E-03 X-HSE-SGA-BLDN SET TO 'T' - ESDE ON SG E-50A (House Event) 1.00E+00 62 47.48 0.18 1.14E-08 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 O-MVMA-MO-1043A MOTOR OPERATED VALVE MO-1043A FAILS TO OPEN 5.85E-03 63 47.65 0.17 1.13E-08 IE_LOMC 1.00E+00 A-FLMK-F-P936 P-936 SUCTION STRAINER PLUGS 1.76E-03 A-OOOT-CSTMK-CDTNL-HEP-2 COND HEP: L-ZZOA-SDC-INIT

  • A-OOOT-CSTMKUP
  • P-CBOB-BUS1E 1.43E-01 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 L-ZZOA-SDC-INIT OPERATOR FAILS TO INITIATE SDC 1.55E-02 64 47.82 0.17 1.11E-08 IE_LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 W-RVMB-RV-1041 PZR SAFETY VALVE RV-1041 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 Y-AVMD-CV-3056 AIR OPERATED VALVE CV-3056 FAILS TO REMAIN OPEN 4.44E-04 65 47.99 0.17 1.11E-08 IELOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVS 6.80E-03 W-RVMB-RV-1040 PZR SAFETY VALVE RV-1040 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 Y-AVMD-CV-3056 AIR OPERATED VALVE CV-3056 FAILS TO REMAIN OPEN 4.44E-04

i'Entergy Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 18 of 28 able AUS-1:

Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

66 48.16 0.17 1.11 E-08 IE-LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to

-challenging PZR SRVs 6.80E-03 W-RVMB-RV-1039 PZR SAFETY VALVE RV-1039 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 Y-AVMD-CV-3056 AIR OPERATED VALVE CV-3056 FAILS TO REMAIN OPEN 4.44E-04 67 48.33 0.17 1.11E-08 IE-LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 W-RVMB-RV-1041 PZR SAFETY VALVE RV-1041 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 Y-AVMD-CV-3027 AIR OPERATED VALVE CV-3027 FAILS TO REMAIN OPEN 4.44E-04 68 48.5 0.17 1.11 E-08 IE-LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 W-RVMB-RV-1 040 PZR SAFETY VALVE RV-1040 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 Y-AVMD-CV-3027 AIR OPERATED VALVE CV-3027 FAILS TO REMAIN OPEN 4.44E-04 69 48.67 0.17 1.11E-08 IE LOMC 1.00E+00 G-PMOA-TRIP-PUMP Operator fails to trip charging pump(s) prior to challenging PZR SRVs 6.80E-03 W-RVMB-RV-1039 PZR SAFETY VALVE RV-1039 FTC (GIVEN SPURIOUS DEMAND )

3.69E-03 Y-AVMD-CV-3027 AIR OPERATED VALVE CV-3027 FAILS TO REMAIN OPEN 4.44E-04 70 48.84 0.17 1.11 E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 Engineering Entergy Analysis 8 - Page 19 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-OLMK-49-2625 THERMAL FUSE 49-2625 FAILS OPEN 3.01E-03 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 71 49.01 0.17 1.11E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 D-BCMT-ED-1 7 BATTERY CHARGER #1 FAILS TO FUNCTION BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E+00 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-OLMK-49-2625 THERMAL FUSE 49-2625 FAILS OPEN 3.01E-03 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 72 49.18 0.17 1.10E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO 'T'- ESDE ON SG E-50A (House Event) 1.00E+00 Z-AVMA-CV-3029 CV-3029 AIR VALVE FAILS TO OPEN 2.99E-03 73 49.35 0.17 1.10E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00

is Enteirgy Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 20 of 28 able A08 -1: Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1,00E-01 X-HSE-SGB-BLDN SET TO T' - ESDE ON SG E-50B (House Event) 1.00E+00 Z-AVMA-CV-3029 CV-3029 AIR VALVE FAILS TO OPEN 2.99E-03 74 49.52 0.17 1.07E-08 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE 1.00E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 75 49.69 0.17 1.07E-08 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 H-ZZOA-OTC-INIT OPERATOR FAILS TO INITIATE ONCE THROUGH COOLING 2.90E-03 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO 'T'- ESDE ON SG E-50A (House Event) 1.00E+00 76 49.85 0.16 1.05E-08 IE LOMC 1.00E+00

A Entergy PSA EA-PSA-SDP-D11-2-11-07 Rev. 1 N'

En ineerin Ente g

g W

Analysis 8 - Page 21 of 28 Table A08-1: Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Y-PMCC-P8C66A-ME COMMON CAUSE FAILURE OF P-8C AND P-66A TO START 1.81E-05 77 50.01 0.16 1.03E-08 IE_LOMC 1.00E+00 A-AVOA-MISCALADJ OPERATOR FAILS TO ADJUST AFW FLOW GIVEN FLOW INSTRUMENT MISC 1.45E-03 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 H-ZZOA-OTC-CDTNL-HEP-3 COND HEP: A-AVOA-MISCALADJ

  • M-OOOT-LPF-INIT
  • H-ZZOA-OTC-INIT 5.44E-01 M-OOOT-LPF-CDTNL-HEP-1 COND HEP: A-AVOA-MISCALADJ
  • M-OOOT-LPF-INIT
  • H-AVOA-HPISUBCLG 2.39E-01 78 50.17 0.16 9.99E-09 IE_LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-C2MC-52-2625 CIRCUIT BREAKER 52-2625 (480V) FAILS TO REMAIN CLOSED 2.71E-03 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 79 50.33 0.16 9.99E-09 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01

P"'E

--r nteirgy Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 22 of 28 Table A08-1 : Top 100 Cuts ets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 O-C2MC-52 2625 CIRCUIT BREAKER 52-2625 (480V) FAILS TO REMAIN CLOSED 2.71E-03 X-HSE-SGA-BLDN SET TO 'T'- ESDE ON SG E-50A (House Event) 1.00E+00 80 50.48 0.15 9.79E-09 IELOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 P-PAMK-EY-10 FAULT ON 120V PREFERRED AC BUS Y10 3.30E-02 P-PAMK-EY-30 FAULT ON 120V PREFERRED AC BUS Y30 1.00E-01 Y-PMCC-P8C66ABME COMMON CAUSE FAILURE OF P-8C 5.10E-05 81 50.63 0.15 9.69E-09 IE LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-1 7 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 H-PMOO-P-66A HPSI PUMP P-66A OUT OF SERVICE FOR MAINTENANCE 2.63E-03 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 82 50.78 0.15 9.69E-09 IELOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

A "Enter Table A08-1: Top 100 Cutsets Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 23 of 28 Cut No.

3

% Total 0.92

% Cut Set

.14 Prob.

.27E-09 Basic Event H-PMOO-P-66A I-CMOE-IA-COMPS X-HSE-SGA-BLDN IELOMC Description HPSI PUMP P-66A OUT OF SERVICE FOR MAINTENANCE OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

SET TO 'T'- ESDE ON SG E-50A (House Event)

Event Prob.

2.63E-03 1.00E-01 1.00E+00 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 O-MVCC-BLKVLV-MA COMMON CAUSE FAILURE OF BOTH ISOLATION VALVES TO OPEN 1.70E-04 84 51.06 0.14 9.05E-09 IELOMC 1.00E+00 A-PMME-P-936 P-936 FAILS TO START 3.29E-03 U-FLCC-TRAV-SCRN COMMON CAUSE FAILURE OF TRAVELING SCREENS 2.75E-06 85 51.2 0.14 8.98E-09 IELOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 E-DGCC-K-6A&B&NSR-MG EDGI-1 EDG1-2 AND NSR COMMON CAUSE FAILURE TO RUN 3.44E-04 E-HSE-EDG11-RUN SET TO 'T' -EDG11 RUN FAILURES ARE MODELED (House Event )

1.00E+00 E-HSE-EDG12-RUN SET TO 'T' -EDG12 RUN FAILURES ARE MODELED (House Event )

1.00E+00 P-LOOP-24HR LOOP COINCIDENT WITH ANOTHER IEVENT (24 HR MISSION TIME )

4.48E-04 86 51.34 0.14 8.93E-09 IE_LOMC 1.00E+00 A-PMME-P-8C AFW PUMP P-8C FAILS TO START 1.65E-03 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 24 of 28 i a,ie Auu - l lop l uu Gutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

O-RVMA-PRV-1043B PRV-1043B POWER OPERATED RELIEF VALVE FAILS TO OPEN 9.29E-03 87 51.48 0.14 8.71E-09 IE LOMC 1.00E+00 A-C2MB-152-209 AFW PUMP P-8C CIRCUIT BREAKER 152-209 FAILS TO CLOSE 1.61 E-03 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 O-RVMA-PRV-10438 PRV-1043B POWER OPERATED RELIEF VALVE FAILS TO OPEN 9.29E-03 88 51.61 0.13 8.67E-09 IELOMC 1.00E+00 A-PMMG-P-BB AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-CBMC-72-403 DC CIRCUIT BREAKER 72-403 FAILS TO REMAIN CLOSED 1.49E-05 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 89 51.74 0.13 8.63E-09 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Y-AVMB-CV-3056 SIRWT RECIRC VALVE CV-3056 FTC 4.42E-03 90 51.87 0.13 8.47E-09 IE LOMC 1.00E+00

Enb9 Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 25 of 28 able AUS-1 :

Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

B-HCMA-HIC-0780A SDCR CONTROLLER HIC-0780A FAILS TO DE-ENERGIZE 1.14E-02 B-XVOB-ADVS-MAN OPERATOR FAILS TO CLOSE MANUAL VALVES TO CLOSE ADV 4.03E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 H-ZZOA-OTC-CDTNL-HEP-4 COND HEP: B-XVOB-ADVS-MAN

  • H-ZZOA-OTC-INIT 1.85E-02 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 91 52 0.13 8.47E-09 IE_LOMC 1.00E+00 B-HCMA-HIC-0780A SDCR CONTROLLER HIC-0780A FAILS TO DE-ENERGIZE 1.14E-02 B-XVOB-ADVS-MAN OPERATOR FAILS TO CLOSE MANUAL VALVES TO CLOSE ADV 4.03E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 H-ZZOA-OTC-CDTNL-HEP-4 COND HEP: B-XVOB-ADVS-MAN

  • H-ZZOA-OTC-INIT 1.85E-02

-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 92 52.12 0.12 7.95E-09 IE LOMC 1.00E+00 A-CVCC-AFWPP3-MA ALL 3 AFW PP CK VALVES CK-FW726 1.07E-05 B-XVOB-ADVS-MAN OPERATOR FAILS TO CLOSE MANUAL VALVES TO CLOSE ADV 4.03E-02 H-ZZOA-OTC-CDTNL-HEP-4 COND HEP: B-XVOB-ADVS-MAN

  • H-ZZOA-OTC-INIT 1.85E-02 93 52.24 0.12 7.81E-09 IE LOMC

+00 1.00E

Enteigy Table A08-1: Top 100 Cutsets Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 26 of 28 Cut No.

% Total

% Cut Set Prob.

Basic Event A-PMME-P-8B Description AFW TURBINE PUMP P-8B FAILS TO START Event Prob.

1.53E-02 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Y-PMCC-P8C66ABME COMMON CAUSE FAILURE OF P-8C 5.10E-05 94 52.36 0.12 7.68E-09 IE_LOMC 1.00E+00 B-RVMB-SRV-SGB ONE SAFETY RELIEF VALVE ON SG B FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 I-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 Q-FVMD-FCV-3029B FLOW CONTROL VLV FCV-3029B FAILS TO REMAIN OPEN 2.08E-03 X-HSE-SGB-BLDN SET TO'T'- ESDE ON SG E-50B (House Event) 1.00E+00 95 52.48 0.12 7.68E-09 IE_LOMC 1.00E+00 B-RVMB-SRV-SGA ONE SAFETY RELIEF VALVE ON SG A FTC 3.69E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01

-CMOE-IA-COMPS OPERATOR FAILS TO START A COMPRESSOR (SCREENING VALUE )

1.00E-01 Q-FVMD-FCV-3029B FLOW CONTROL VLV FCV-3029B FAILS TO REMAIN OPEN 2.08E-03 X-HSE-SGA-BLDN SET TO'T'- ESDE ON SG E-50A (House Event) 1.00E+00 96 52.6 0.12 7.67E-09 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02

-Entew Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 27 of 28 Table A08-1 : Top 100 Cutsets Cut No.

% Total

% Cut Set Prob.

Basic Event Description Event Prob.

A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Z-KVMB-SV-3029A SUMP TO EAST ESS AIR SUPPLY SV-3029A FTE 3.93E-03 97 52.72 0.12 7.67E-09 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Z-KVMB-SV-3029B SUMP TO EAST ESS AIR SUPPLY SV-3029B FTE 3.93E-03 98 52.84 0.12 7.67E-09 IE_LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00 D-BCMT-ED-17 BATTERY CHARGER #3 FAILS TO FUNCTION 1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Y-KVMB-SV-3056B SIRWT RECIRC VALVE SOLENOID SV-3056B FTE 3.93E-03 99 52.96 0.12 7.67E-09 IE LOMC 1.00E+00 A-PMMG-P-8B AFW TURBINE PUMP P-8B FAILS TO RUN 5.82E-02 A-PMOO-P-8C AFW PUMP P-8C OUT OF SERVICE 3.35E-03 D-BCMT-ED-15 BATTERY CHARGER #1 FAILS TO FUNCTION 1.00E+00

A Enterg Table A08-1: Top 100 Cutsets Entergy PSA Engineering Analysis EA-PSA-SDP-D 11-2-11-07 Rev. 1 8 - Page 28 of 28 Cut No.

% Total

% Cut Set Prob.

Basic Event D-BCMT-ED-17 Description BATTERY CHARGER #3 FAILS TO FUNCTION Event Prob.

1.00E-01 D-HSMC-HS-72-01 HAND SWITCH 72-01 FAILS TO REMAIN CLOSED 1.00E-01 Y-KVMB-SV-3056A SIRWT RECIRC VALVE SOLENOID SV-3056A FTE 3.93E-03 100 53.08 0.12 7.61E-09 IELOMC 1.00E+00 A-PMCC-P8ABC-ME COMMON CAUSE FAILURE OF ALL 3 AFW PUMPS P-8A/B/C TO START 5.45E-05 Y-AVCC-3027-56MB BOTH SIRWT RECIRC VALVES CV-3027 & CV-3056 COMMON CAUSE FTC 1.40E-04

Entergy PSA EA-PSA-SDP-D11-2 07 Rev. I En ineerin Entc^

g g

gy Analysis 9 - Page I of 2 9 Sequences Note: Entire table is changed from Revision 0 - revision bars omitted for editorial reasons.

Table A09-1 : Sequence Results Event tree Sequence CCDP Count End State TR-MCND 20 1.95E-06 2126 CORE-DAMAGE TR-MCND 18 1.30E-06 1913 CORE-DAMAGE TR-MCND 22-15 1.11E-06 1

CORE-DAMAGE TR-MCND 22-13 5.26E-07 6

CORE-DAMAGE TR-MCND 19 3.44E-07 397 CORE-DAMAGE TR-MCND 8

3.35E-07 669 CORE-DAMAGE TR-MCND 21-09 1.46E-07 76 CORE-DAMAGE TR-MCND 21-02 1.42E-07 156 CORE-DAMAGE TR-MCND 6

1.26E-07 291 CORE-DAMAGE TR-MCND 21-10 1.21E-07 262 CORE-DAMAGE TR-MCND 21-15 1.05E-07 77 CORE-DAMAGE TR-MCND 22-03 9.09E-08 3

CORE-DAMAGE TR-MCND 7

4.63E-08 119 CORE-DAMAGE TR-MCND 22-14 4.14E-08 1

CORE-DAMAGE TR-MCND 5

4.10E-08 72 CORE-DAMAGE TR-MCND 22-05 1.66E-08 I

CORE-DAMAGE TR-MCND 22-04 7.15E-09 1

CORE-DAMAGE TR-MCND 22-16 4.73E-09 1

CORE-DAMAGE TR-MCND 21-20 3,99E-09 16 CORE-DAMAGE TR-MCND 22-10 1.93E-09 1

CORE-DAMAGE TR-MCND 21-19 1.10E-09 6

CORE-DAMAGE TR-MCND 22-08 9.15E-10 1

CORE-DAMAGE TR-MCND 22-06 8.18E-10 1

CORE-DAMAGE TR-MCND 17 6.75E-10 5

CORE-DAMAGE TR-MCND 21-07 6.67E-10 5

CORE-DAMAGE TR-MCND 21-18 2.22E-10 2

CORE-DAMAGE

A Entergy PSA En ineerin EA-PSA-SDP -D11-2 07 Rev. 1 Ent^gy g

g Analysis 9 - Page 2 of 2 Sequence Key:

XX Transient with Loss of Main Condenser (TR-MCND) 21 -XX LOCA via Pressurizer Safety Relief Valve(s) (XFR-SBLOCA-SRV) 22-XX Anticipated Transient Without SCRAM (XFR-ATWS)

Ift Entergy PSA En ineerin EA-PSA-SDP -D11-2 07 Rev. 1 Ente^gy g

g Analysis 0 - Page 1 of 5 0:

Auxiliary Feedwater Flow Rate to Steam Generators E-50A and E-50B Following the Failure of Panel ED-11-2 on September 25, 2011 1.0 PURPOSE Flow rate indication from the P-8A and P-8B auxiliary feedwater (AFW) pump train was lost for a period of time following the failure of dc panel ED-11-2 on September 25, 2011.

It was known that the P-8C pump train was providing relatively equal flow to both steam generators and its associated flow control valves were functioning normally. Pump P-8B started automatically due to the loss of dc power, which also caused its flow control valves to fully open. The P-8B flow rate to the steam generators for this configuration was not known, and the reason for steam generator E-50A level increasing (40% to 90%)

significantly more than E-50B (35% to 60%) was not understood. (Note: E-50A and E-50B levels were observed at 40% and 35% during EOP-1.0 (-1515).)

This evaluation utilizes the AFW system Pipe-Flo hydraulic model to establish AFW flow rates to the steam generators as a function of time and dome pressure for input to the Modular Accident Analysis Program (MAAP) model.

2.0 INPUT 2.1 Hydraulic Model The Pipe-Flo Professional 2007 base-deck hydraulic model of the Auxiliary Feedwater system, as developed in EA-PSA-PIPEFLO-AFW-08-06 [1], was used for the evaluation. Pipe-Flo is classified level "A" (safety related software) in accordance with EN-IT-104. The software quality assurance plan is found in [1].

2.2 Condensate Storage Tank Temperature The condensate storage tank (T-2) temperature was 87'F as recorded in the electronic operator rounds (eSOMS) at 0752 on 9-25-2011.

2.3 Steam Generator Pressure and P-8C Flow Rate Data Steam generator pressures were obtained from the PI data archive. PI is classified as SQA category "C" (important to business) in accordance with Entergy procedure EN-IT-104. The plant process computer (PPC) is classified as SQA category "B" system (regulatory commitments). The PPC is the PI data source.

Most PPC points are calibrated via technical specification surveillance procedure or preventive maintenance and controlled calibration sheets.

Part of the PI server system runs on the PPC. This portion monitors selected points every second to test against the exception threshold change value. If the change value is exceeded, the data is passed to the PI server and recorded. The PI server also compares the new value against previous values to see if it still fits on a line within the compression limit. If yes, the data is discarded, otherwise it is added to the archive. For pump starts, the compression limit is simply a change in state (on-off or start-stopped).If 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> have passed without an archive update, one is made regardless. PI generally provides accurate long term values and greater amounts of data when events are changing rapidly.

For this analysis, PI server tags PT0751 B (Steam Generator E-50A Pressure), PT0752B (Steam Generator E-50B Pressure), FT0737 (AFW Flow to Steam Generator E-50A) and FT0736 (AFW Flow to

A v

Entergy PSA En ineerin EA -PSA-SDP-D11-2 07 Rev. 1 EnteW g

g Analysis 0 - Page 2 of 5 Steam Generator E-50B) were used to extract sampled data from the PI archive for the period in which P-8B AFW pump was in service on 9-25-2011 (Per Attachment 01 of this analysis P-8C was in service from 15:06 - 15:44). Values shown in Table 2.3-1 are averages over each time period.

Table 2. 3-1:

P1 Archive Average Steam Generator Pressure and P -8C Flow Rate Data 15:06 - 15:20 15:21 - 15:29 15:30-15:39 15:40-16:03 Pressure P-8c Flow Rate Pressure P-8C Flow Rate Pressure P-8C Flow Rate Pressure P-8C Flow R t

^Psi9)

(gPm)

^ps^g)

(gpm )

(psig)

(gpm )

^Ps^9) a e (9pm)

E-50A 948.3 163.4 923.4 164.8 896.9 152.1 859.9 0

E-50B 945.0 162.5 955.7 159. 8 969.4 161.7 958.2 163.4 3.0 ASSUMPTIONS 3.1 Major Assumptions 3.1.1 Auxiliary feedwater system flow control valves CV-0727 and CV-0749 are fully open from event initiation at 15:06 until steam was isolated to the P-8B steam turbine at an estimated time of 16:03.

Basis : A review of electrical schematics by system experts and operations staff found the flow control valves fail in the fully open position on loss of dc power. Steam isolation to the P-8B turbine driver occurred at approximately 16:03 based on a review of operator logs and interviews. See Attachment 01 for the event time line.

Bias:

This assumption is neutral as it represents a realistic event based on the best available information.

3.2 Minor Assumptions 3.2.1 For the purpose of establishing the pump suction pressure and recirculation boundary conditions, condensate storage tank (T-2) level is assumed to remain at 82% level. This equates to a level of 274" above the tank bottom [2] (approximately 9.9 psig at the 590 elevation). With respect to the modeled P-8B recirculation node, this would equate to 13.8 psig as it's elevation is at 581 feet. The P-8C recirculation node is at 583 feet, so its boundary pressure is 12.9 psig.

Basis :

This level was recorded in the electronic operator rounds (SOMS) database at 10:41 on the day of the event. During the event, level indication was lost.

Bias :

This assumption is neutral and has a negligible impact on calculated flow rates. Pump flow rate is normally set by the flow control valves, but it is primarily a function of steam generator pressure when the flow control valves are fully open.

3.2.2 All pump curves used in the model are assumed to be nominal (e.g. the pumps have no performance degradation from typical surveillance test results). Pipe-Flo model pump curve data points were obtained from [1].

Basis :

Palisades' pump in-service test (IST) data has consistently demonstrated that all pumps in the AFW system perform slightly below manufacturer's factory test data. This can be demonstrated by a review of EA-EC82841-02 Rev. 0, "Auxiliary Feedwater System Capacity", Appendix A. The pump curve data plotted in this analysis illustrates consistent pump performance over several years. Although

As v'

Entergy PSA En ineerin EA-PSA-SDP -D11-2 07 Rev. I EntCTO67 g

g Analysis 0 - Page 3 of 5 some degradation of the pumps is allowed by the IST procedure, which is accounted for in design basis analyses, the actual pump performance has been consistently nominal.

Bias:

This assumption is neutral as it results in a realistic evaluation of the pump condition.

3.2.3 Dynamic head loss from the steam generator dome to the main steam safety valves is neglected.

Basis :

Reference [4] calculates the dynamic head loss between the steam dome and the main steam safety valves to be 19.9 psid. This analysis accounts for safety valve accumulation and piping losses based on a steam flow rate shortly after a plant trip. Application of this additional pressure to the steam generator boundary condition is deemed overly conservative as it considers the main steam safety valves are fully open for the duration of the event and applies a constant decay heat value for steaming.

Realistically, the safety valves are only open for short periods of time, or in an intermediate throttle position for longer periods, and decay heat decreases over time.

Bias:

This assumption is neutral. Applying the dynamic head loss value would be overly conservative and unrealistically reduce the P-8B flow rate to the steam generators.

4.0 ANALYSIS 4.1 Pipe-Flo Model Balancing to Test Data with Fully Open Flow Control Valves Typically, the AFW system is operated by setting the flow control valves to a specific flow rate. To account for line losses and the pressure drop through the flow control valves in the wide open position, flow elements based on Special Test T-202 [3] were developed here.

The T-202 test was performed to determine the system flow rate to a single steam generator with a flow control valve in the full open position and flow to the other steam generator isolated. Although the test was performed using only P-8A, the P-8A/P-8B pump train share common discharge piping and flow control valves. The pumps are also adjacent to each other in the AFW pump room; therefore, any variations in line losses between the two are negligible.

To determine system the pressure drop under the test conditions, simulated flow control valves were inserted into the Pipe-Flo model [1] at pipelines 180 and 210 and set at the test measured flow rate.

Table 4.1-1:

Special Test T-202 Test Results Flow Rate to E-50A (gpm )

E-50A Dome Pressure (psia)

Flow Rate to E-50B (gpm)

E-50B Dome Pressure (psia)

T-2 Level (ft)

T-2 Temperature (F) 418.6 889.7 427.3 856.3 608.14 85 With the Pipe-Flo model aligned per the test configuration and boundary conditions established as shown in Table 4.0-1, the modeled flow control valves calculated a pressure drop of 68.89 psid in line 210 (flow to E-50A) and 83.73 psid in line 180 (flow to E-50B) would be required to establish the measured flow rate [1].

Using the calculated differential pressure and measured flow rate from T-202, reference [1] calculated fixed loss coefficients (K) in the pipelines as shown in Table 4.0-2.

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