ML20204E653

Responds to NRC 990120 RAI Re Proposed Amend Application Numbers 158 & 142 Re Containment Isolation Valve Completion Time

ML20204E653
Person / Time
Site:	San Onofre
Issue date:	03/22/1999
From:	Scherer A SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-MA1549, TAC-MA1550, NUDOCS 9903250092
Download: ML20204E653 (38)

Text

'

i A. Edward Scherer rpl 500DHRN CALDORMA

,k,,,,j EDISON An LDISO% INTIK\All0NAL"' Cumpsny M6 March 22, 1999 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Docket Nos. 50-361 and 50-362 Response to the NRC Request for Additional Information to Support Proposed Technical Specification Number NPF-10/15-460, Containment isolation Valve Completion Time (TAC Nos. MA1549 and MA1550)

San Onofre Nuclear Generating Station Units 2 and 3

References:

1) Letter from James W. Clifford (NRC) to Harold B. Ray (SCE), dated January 20,1999,

Subject:

Request for Additional Information on Containment isolation Valve Completion Time Technical Specification (TAC Nos. MA1549 and MA1550)

2) Letter from Dwight E. Nunn (SCE) to the Document Control Desk (NRC), dated April 6,1998,

Subject:

Supplement 1 to Amendment Application Nos.158 and 142, Containment Isolation Valve Completion Time, San Onofre Nuclear Generating Station, Units 2 and 3 This letter provides additional information as requested by the U. S. NRC in Reference 1 to support the review of the risk analysis supporting Southern California Edison's (SCE's) Amendment Application Nos.158 and 142 for San Onofre Units 2 and 3, respectively (Reference 2). The enclosure to this letter contains the requested information.

f h

9903250092 990322 g 1 1

DR ADOCK0500g31 P. O, llox 128 San Clemente. CA 92674 0128 949-368-7501 Fax 949-368-7575 l

t a

l Document Control Desk If you have any questions or need addition information regarding this matter, please feel free to contact me or Jack Rainsberry at (949) 368-7420.

1 Sincerely, j

Enclosures cc: E. W. Merschoff, Regional Administrator, NRC Region IV )

J. A. Sloan, NRC Senior Resident inspector, San Onofre Units 2 & 3 J. W. Clifford, NRC Project Manager, San Onofre Units 2 and 3 i

i

Enclosure Response to the NRC Request for Additional Information Containment Isolation Valve Completion Time

Containment Isolation Valve Completion Time Page 1 of 8 Tier 1: Risk Impact and PRA Validity

1. What is the SONGS updated baseline CDF, baseline LERF, and what is the impact of the proposed TS change CDF, ICCDP, LERF, and ICLERP? Do these values and the values given on page 3 of your submittal include shutdown risk and risks stemming from both internal and external events?

The San Onofre Nuclear Generating Station g0NGS) updated baseline core damage frequency (CDF) and large early release frequency (LERF) are 7.7E-5 per year and 5.8E-7 per year, respectively, using the latest SONGS living Probabilistic Risk Assessement (PRA) model.

These values represent risks stemming from both internal and external events (i.e., seismic and fire) when the plant is at full power. The April 6,1998, submittal (Reference) and the updated CDF and LERF values do not include shutdown risk. These values do not include shutdown risk since the affected Technical Specification (TS) 3.6.3 does not apply during Modes 5 and 6. The updated CDF and LERF values are higher than those in the referer.ce because they include external events and recent updates to the SONGS living PRA model.

The impact of the proposed TS change on plant risk (i.e., ACDF, ALERF, incremental Conditional Core Damage Probability (ICCDP) and Incremental Conditional Large Early Release Probability (ICLERP)) is summarized in Table I below.

I l

p Containment Isolation Valve Completion Time Page 2 of 8 Table 1 Impact of Proposed TS Change on Plant Risk, ACDF, ALERF,ICCDP and ICLERP Valve ID Change Change Proposed ICCDP ICLERP in CDF in LERF AOT(or CT)

(ACDF (ALERF (Based on

/yr) /yr) Current System AOT)

Containment Air Cooler Cooling Water 5.0E-7 < l.0E-9 7 days 9.6E-9 <2E-11 Valves (8)(HV 6367 through HV 6373)

Containment Spray i Valves (2)(HV-9367 < l.0E-9 < l.0E 9 3 days <8E-12 <8E-12 and HV-9368)

Containment Pressure Dctcctor Valves (4) Negligible Negligible No system Negligible Negligible (HV-0352A through AOT ,

HV-0352D) proposed l (a) l Charging Valve (1) 1.0E-7 1.0E-9 3 days 8E-10 8E-12 (HV-9200)

High Pressure Safety injection Valves (8) < l.0E-9 < l.0E-9 3 days <8E-12 <8E-12 (HV-9323, HV-9324, HV-9326, HV-9327, HV-9329. HV-9330, HV-9332, and IIV-9333 Low Pressure Safety injection Valves (4) 6.0E-7 < l.0E-9 3 days 4.9E-9 <8E-12 (HV-9322. HV-9325, HV 9328, and HV-933l)

(a) No current system Allowed Outage Time (AOT)( or completion Time (CT)) exists.

Containment Isolation Valve Completion Time Page 3 of 8

2. In modeling the proposed TS change, what values did you use for the unavailabilities of these valves? What is the effect of the unavailability of the valves on the unavailability of the related system? Were all of the D.1. and D.2. valves modeled in the PRA? If not, how are the valves accounted for in the PRA?

i The values for the unavailabilities of the valves used in the SONGS living PRA are summarized in Table 2 below. The values are based on generic failure rates for motor operated valves (MOVs) and air operated valves (AOVs) with consideration of a correction factor (i.e.,1 - p) for redundant valves that also include common cause failure (CCF) probabilities. Generic failure rates are acceptable for use with these valves because their impact on plant CDF and LERF is insignificant. '

Plant-specific failure rates are typically used for high safety significant components. The impact of the valve unavailability on the unavailability of the related system is also summarized in Table 2.

1 All the D.1 and D.2 valves are modeled in the SONGS living PRA with the exception of the Containment Pressure Detector Valves (i.e., HV-0352A, HV-0352B, HV-0352C, HV-0352D). The containment pressure detector valves are solenoid-operated valves which receive no Engineered Safety Features Actuation System (ESFAS) signals and are normally key-locked open. The containment pressure detector line inside the containment is open to the containment environment.

An orifice is provided on each containment pressure detector line inside containment to limit the release of radioactive material in a design basis event to less than 10CFR100 limits, should the solenoid valve and pressure detector outside containment fail to isolate the line from the environment. The containment pressure detector line does not impact the risk of core damage or large early radioactive release.

i f

i 4

l I

Containment Isolation Valve Completion Time Page 4 of 8 Table 2 Impact of Valve Unavailability on Related System Unavailability Valve ID Valve Unavailability Impact of Valve Unavailability on Related System

/ Demand Unavailability

• Containment Air Cooler 2.4E-3 Unavailability ofIIV-6367 (secured closed) does Cooling Water Valves (8) (same for all 8 valves) not lead to Containment Emergeng Cooling (HV-6367 through system failure. Unavailability of HV-6367 will HV-6373) result in unavailability of Containment Emergency Cooling Unit E-401, which is one out of four redundant units. Furthermore, the Containment Spray system also provides containment cooling.

Containment Spray 2.74E-3 Unavailability of HV-9367 (secured closed) does Valves (2)(HV-9367 and (same for both valves) not lead to Containment Spray (CS) system HV-9368) failure. Unavailability of HV-9367 will result in unavailability of Train A of CS system, which is one out of two redundant trains. Furthermore, the Containment Emergency Cooling system also provides containment cooling.

Containment Pressure Not modeled in PRA Unavailability of any Containment Pressure Detector Valves (4) Detector Valve does not lead to system failure (HV-0352A through since there are four redundant detector lines.

HV-0352D) Furthermore, the containment pressure detector line does not impact the risk of core damage or large early radioactive release.

Charging Valve (1) 2.4E-6 Unavailability of HV-9200 (secured closed) will (HV-9200) result in unavailability of the charging system.

However, the plant can not operate long term with this valve closed and alternate charging path not being established. Upon closure of the charging valve HV-9200, an alternate charging path will be established by the operators following abnormal operating instruction (AOI) SO23-13-14.

High Pressure Safety 2.74E-3 Unavailability of HV-9323 (secured closed) does Injection Valves (8) (same for all 8 valves) not lead to High Pressure Safety Injection (HPSI)

(HV-9323, HV-9324, system failure. Unavailability of HV-9323 will HV-9326, HV-9327, result in unavailability of one out of eight flow HV-9329, HV-9330, paths. Furthermore, CS system in RCS cold leg HV-9332, and HV-9333 injection mode also provides RCS injection flow.

Low Pressure Safety 2.57E-3 Unavailability of HV-9322 (secured closed) does Injection Valves (4) (same for all 4 valves) not lead to Low Pressure Safety injection (LPSI)

(HV-9322, HV-9325, system failure. Unavailability of HV-9322 will HV-9328, and HV-9331) result in unavailability of one out of four flow paths.

• Anal sis 3 is done for one valve at a time. Impact of each of the other valves will be the same as shown in the table.

I Containment Isolation Valve Completion Time Page 5 of 8

3. What event sequences are important to the proposed change? What are the major factors contributing to their risk significance?

Containment Air Cooler Cooling Water Valves (8) (HV-6367 through HV-6373)

The dominant CDF cutsets involve a small loss of coolant accident (LOCA) or a transient-induced small LOCA with failure oflong term containment cooling provided by the containment emergency cooling system. The major risk contributing factors are unavailability of Component Cooling Water (CCW) or Salt Water Cooling (SWC) to provide cooling water to emergency fan coolers, fan coolers manual valves being in the closed position as a result of pre-initiating event human error, or random failure of other Containment Air Cooler Cooling Water MOVs to open on demand. There are no LERF sequence cutsets, including HV-6367 failure, above the cutoff value of 1.0E-9/yr, hence the impact on LERF of a Containment Air Cooler Cooling Water valve in the secured closed position is negligible. The CDF and LERF sequence cutsets with frequencies above the cutoff value of 1.0E-9/yr for the case where HV-6367 is secured closed are given in Attachment A.

Containment Sorav Valves (2)(HV-9367 and HV-9368)

For the case of HV-9367 in the secured closed position, there are no CDF and LERF sequence cutsets, including HV-9367 failure, with frequencies above the cutoff value of 1.0E-9/yr. Hence, the impact of HV-9367 in the secured closed position on plant risk (CDF and LERF) is negligible.

As shown in Table 2, failure of HV-9367 (or HV-9368) results in failure of only one out of two redundant trains of Containment Spray system. Furthermore, the Containment Emergency Cooling system with four redundant cooling units also provides containment cooling if the CS system is unavailable.

Containment Pressure Detector Valves (4)fUV-0352A through HV-0352D)

These valves are not modeled in the SONGS living PRA due to their insignificant impact on plant risk (see response to Question # 2).

Charging Valve (n (HV-92001 The dominant CDF cutsets involve a transient-induced (e.g., turbine trip (TT) or loss of power conversion system (PCS)) anticipated transient without scram (ATWS) with loss of emergency boration via the charging system as a result of HV-9200 failure. Another dominant CDF cutset involves a steam generator tube rupture (SGTR) event with failure of the HPSI and Charging System in the cold leg injection mode. The dominant LERF sequence cutset involves a SGTR event with failure of the High Pressure Safety Injection (HPSI) and Charging System in the cold leg injection mode. The major risk contributing factors are mechanical failure of the reactor protection system (RPS) and common cause failure (CCF) of HPSI pumps to start on demand for CDF and

i l

i Containment Isolation Valve Completion Time Page 6 of 8 ,

I CCF of HPSI pumps to start on demand for LERF. The CDF and LERF sequence cutsets with frequencies above the cutoff value of 1.0E-9/yr for the case where HV-9200 is secured closed are given in Attachment A.

High Pressure .Saftty injection Valves (8) (HV-9323. HV-9324. HV-9326. HV-9327. HV-9329.

HV-9330. HV-9332. and HV-9333 For the case of HV-9323 in the secured closed position, there are no CDF and LERF sequence J cutsets, including HV-9323 failure, with frequencies above the cutoff value of 1.0E-9/yr. Hence, the impact of HV-9323 in the secured closed position on plant risk (CDF and LERF) is negligible.

As shown in Table 2, failure of HV-9323 (secured closed) does not lead to HPSI system failure.

Failure of HV-9323 will result in failure of one out of eight flow paths of HPSI injection to the RCS.

Furthermore, the CS system in the RCS cold leg injection mode also provides RCS injection flow if l HPSI is unavailable.

I Low Pressure Safety injection Valves (4)(HV-9322. HV-9325. HV-9328. and HV-9331)

The injection CDF cutsets involve a large LOCA event with failure of Low Pressure Safety Injection I (LPSI) flow. Failure of HV-9322 (secured closed) results in failure of one out of four flow paths of LPSI injection to the RCS. The major risk contributing factors involve random failure of the other LPSI MOV on the intact RCS path (i.e., HV-9325,9328,9331) to open on demand, MOVs unavailability due to maintenance (being in a closed position), CCF of the other trains MOVs to ,

open on demand, failure of the 480 V motor starters that supply power to MOVs, or failure of the l RCS injection path check valves to open on demand associated with other trains (i.e., IB,2A,2B).

There are no LERF sequence cutsets, including HV-9322 failure, above the cutoff value of 1.0E- l 9/yr, hence the impact on LERF of a LPSI valve in the secured closed position is negligible. The CDF and LERF sequence cutsets with frequencies above the cutoff value of 1.0E-9/yr for the case where HV-9322 is secured closed are given in Attachment A.

4. Describe how uncertainties were considered? Were sensitivity studies performed to address the impact of variation in preventive maintenance times?

The PRA results reflect point estimates (or mean values) of core damage and large early release risk.

Since the change in risk (i.e., ICCDP and ICLERP) for all the configurations, as shown in Table 1, are well below the Regulatory Guide 1.177 acceptance criteria (i.e., about two orders of magnitude smaller than the ICCDP criterion of 5.0E-7 and more than three orders of magnitude smaller than the ICLERP criterion of 5.0E-8), it isjudged that the point estimate analysis is sufficient for this application, and therefore, no uncenainty or sensitivity analysis was performed.

l 1

1 Containment Isolation Valve Completion Time Page 7 of 8 )

i l

1 During MOVATS testing, what is the position of the valve and could the valve be opened to perform its ESF function? If so,is this recovery credited in the PRA? The required action in the TS is to " secure the inoperable valve (s) in its ESFAS position."

Does this mean to manually lock open the valve?

To allow MOVATS testing the Operations department down powers the valve in the open position and declares the valve inoperable. During the MOVATS testing the valve is stroked and any required preventive maintenance is performed. Locking the valve in any one position would prevent MOVATS testing.

The PRA assumes that the valves are secured in the closed position (i.e., non-ESFAS position)in the evaluation of the impact of the proposed AOTs on plant risk. No valve recovery is ciedited in the PRA model.

Tier 2: Consideration ofIligh Risk Configurations Provide details about compensatory measures taken before a D.I. or D.2. containment isolation valve is taken out of service.

No compensatory measures are taken. The only actions the Operations department performs is to declare the valve inoperable and down power the valve in the open postion.

Ti.e PRA analysis does not give credit to any compensatory measures in assessing plant risk.

However, it is noted that in the case of Charging Valve HV-9200, it is important that the plant cannot be operated for an extended time with this valve closed and an alternate charging path out of service. The results of the PRA analysis indicate that if the plant is operated for the proposed AOT of 3 days with HV-9200 secured closed and an alternate charging flow path via the line to the HPSI head in service (per plant procedure AOI SO23-13-14), the risk acceptance criteria in Regulatory Guide 1.177 would be met. Credit for operator action to establish an alternate charging flow path upon closure ofHV-9200 was added in the PRA model in support of the amendment requests.

Tier 3: Configuration Risk Management Program (CRMP)

Describe how the SONGS CRMP is used to reduce risk when a D.I. or D.2. containment isolation valve is taken out of se:Tice.

The SONGS CRMP does not reduce risk, but is utilized to manage risk. The CRMP provides a proceduralized risk-informed assessment to manage the risk associated with equipment inoperability.

The program applies to technical specification stmetures, systems, or components for which a risk-informed Completion Time (CT) has been granted. The containment isolation valves for which risk-informed Completion Times are proposed would be subject to the CRMP. As indicated previously, the SONGS CRMP tool can address the safety significance of unavailability of these i

l I

Containment Isolation Valve Completion Time Page 8 of 8 valves. The program includes the following elements:

a. Provisions for the control and implementation of a Level 1 at power internal events PRA-informed methodology. The assessment is capable of evaluating the applicable plant configuration.

b. Provisions for performing an assessment prior to entering the Limitations, Conditions of Operation (LCO) Condition for preplanned activities.

c. Provisions for performing an assessment after entering the LCO Condition for unplanned entry into the LCO Condition.

d. Provisions for assessing the need for additional actions after the discovery of additional equipment out of service conditions while in the LCO Condition.

e. Provisions for considering other applicable risk significant contributors such as Level 2 PRA issues, and external events, qualitatively or quantitatively.

Reference:

April 6,1998 letter from Dwight E. Nunn (SCE) to the Document Control Desk (NRC),

Subject:

Supplement I to Amendment Application Nos.158 and 142, Containment Isolation Valve Completion Time, San Onofre Nuclear Generating Station, Units 2 and 3.

l l

l l

l l

1 l

Attachment A CDF and LERF Sequence Cutsets Pages A-1 through A-27 l

1 l

VALVE HV-6367' UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR

~

SMCUTSET.EXE V1.~2 - Southern California Edison Company

-- CutSet' Report: '3/11/99 16:26 i

' Total Frequency = 7.74E-05 Cu'tSet Number: 107' CutSet Frequency = 7.95E-08 N-MV6367---P 1.007+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND l N-HAXV208- X'8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 P-HTE002---M'3.45E-03 HEAT EXCHANGER E002 OOS FOR~ HEAT TREATMENT CD 1.00E+00 DUMMY-EVENT FOR CORE DAMAGE CUTSETS INIT-SL. 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

-CutSet Number;- 108 .CutSet Frequency = 7.95E-08 CD  ; 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

.INIT-SL. 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' N-RAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT CutSet Number: 231 . Cutset Frequency - 4.01E-08 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT NOATWS 1.00E+00 DUMMY' EVENT FOR NON-ATWS CONDITION INIT-SL. 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2S?.'

N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE.TO MAINTENANCE-N-HV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND

.CutSet Number: 232 CutSet Frequency - 4.01E-08 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-SL 2.88E-03 INITIATING EVENT.SL FOR EVENT TREE 'SO2SL' N-MV6367---P 1.00E+00 MTR-OPERATED VLV-6367 FT OPEN ON DEMAND N-HV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

-P-HTE002*--M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT

.CutSet Number: 265 CutSet Frequency - 3.51E-08 INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT NOATWS .1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

.N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CutSet Number: 383' CutSet Frequency = 2.38E-08

'N-MV6367---P 1;00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-MV6371---P.2~.40E-03 MTR-OPERATED VLV.6371'FT OPEN ON DEMAND INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT' TREE 'SO2SL' CD' 1.00E+00 DUMMY EVENT.FOR CORE DAMAGE CUTSETS P-HTE002---ML3.45E-03' HEAT. EXCHANGER E002 OOS FOR HEAT TREATMENT

~NOATWSL 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION A-1 4

c:

VALVE HV-6367 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Numberi 1745 CutSet Frequency - 4.61E-09 NOATWS 1.00E+00 DUMMY EVENT FOR'NON-ATWS CONDITION

'P-HCBCKFLSHU 1.00E+00 OPERATOR FAILS TO BACKFLUSH HX 001A W/IN 24 HR P-HTE002-1DC 2.00E-04 HEAT:X (TUBE) E002 PLUGGED / FOULED W/I 24 H

.N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208

'CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-SL 2.88E-03~ INITIATING EVENT SL FOR EVENT TREE 'SO2SL' N-MV6367---P.1.00E+00-MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CutSet Number: 1746- CutSet Frequency = 4.61E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HCBCKFLSHU 1.00E+00 OPERATOR FAILS TO BACKFLUSH HX 001A W/IN 24 HR N-MV6367---P 1.00E+00 MTR-UPERATED.-VLV 6367 FT OPEN ON DEMAND N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS P-HTE002-1DC 2.00E-04 HEAT X (TUBE) E002 PLUGGED / FOULED W/I 2s H CutSet Number: 1831 CutSet Frequency = 4.39E-09 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMANE Y-03RV-DEM-Z 1.00E-01 POST-TRIP PRFSSURIZER SAFETY VALVES DENsNDO Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DE'<

NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-HAXV208--X 8.00E-03-MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR 'lEAT TREATMENT CutSet Number: 11832 CutSet Frequency = 4.39E-09 NOATW3 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT-TREATMENT Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED'- CCW TC i E399 INIT-PCS 5.30E-01' INITIATING EVENTPCS FOR EVENT TREE 'dv2PCS'

-CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED -

CutSet Number: 1833 . CutSet Frequency - 4.39E-09 NOATWS 1.00E+00 DUMMY-EVENT FOR NON-ATWS CONDITION Y-RV0200---N 3.00E-03 RELIEF VLV-SPRING LOAD 0200 FT CLOSE ON DEM

-Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' A-2 t_n

)

VALVE HV-6367 UNAVAILABLE j SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR I l

CutSet Number: 1834 CutSet Frequency - 4.39E-09

'P-FTF002---M 3.45E-03 HEAT EXCHANGER. E002 OOS FOR HEAT TREATMENT t- PM701---N'3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM

NOATdS 1.00E+00 DUMMY EVENT POR NON-ATWS CONDITION Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-HAXV207--X 8.00E-03. MANUAL VALVE 207 MISALIGNPD - CCW TO ECU E399 INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367' FT OPEN ON DEMAND CutSet Number: 2224 CutSet Frequency = 3.36E-09 N-HV6367---E 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND U-DG2G3--8HR 2.82E-02-DIESEL GENE **'7R203 FT RUN - TRAIN B ESP POWER NOLOP. 1.00E+00 DUMMY EVE - ^R NO LOSP NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 INIT-SEIS5 1.49E-05 SEISMIt, EVENT LEADING TO SMALT. LOCA, LOP - SDS 2 2G3-FAILS 1.00E+0C No description provided CD- 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet Number: 2225 CutSet Frequency - 3.36E-09 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND.

U-DG2G3--8HR 2.82E-02. DIESEL GENERATOR 2G3 FT RUN - TRAIN B ESF POWER NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS 2G3-FAILS 1.00E+00.No description provided NOLOP- 1.00E+00 DUMMY EVENT FOR NO LOSP N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 CutSet Number: 2452 CutSet Frequency - 2.98E-09 N-MSDE48---N 3.00E-04 MTR STARTER BE4 8 FT CIOSE ON DEMAND P-HTE002---M 3.45E-05 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT N-MV6307---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-SL 2.88E-03' INITIATING EVENT SL FOR EVENT TREE 'SO2SL' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS FOATWS- 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION CutSet Number: 2455 CutSet Frequency = 2.98E-09 CD 1.00E+00 DUMMY EVEFT FOR CORE DAMAGE CUTSETS INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' N-MSBO410--N 3.00E-04 MTR STARTER BO410FT CLOSE ON DEMAND N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION l P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT CutSet Number: 2456 CutSet Frequency = 2.98E-09 INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-FNE399---S 3.00E-04 FAN E399 FT STARTON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-HV6367---P-1.00E+00 MTR-OPERATED VLV 6367 FT.OPEN ON DEMAND A-3 4

r__

VALVE HV-6367 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number: 2592' CutSet Frequency = 2.77E-09 CD 1.00E+00 DUMMY EVFVT FOR CORE DAMAGE CUTSETS

~INIT-SL 2 88B-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' N-HAXV207--X 8.00E-03-MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS _

1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

.P-MP113----M 6.42E-02 MTR-DRIVEN PP 113 OOS FOR MAINTENANCE

.P-MP114--1DR 1.87E-03 MTR-DRIVEN PP 114PT RUN FOR 24 HR CutSet" Number: ; 2593 .CutSet Frequency - 2.77E-09 lN-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND P-MPll4--1DR.1.87E-03 MTR-DRIVEN PP 114FT RUN FOR 24 HR NOATWS 1.00E+00-DOMMY EVENT FOR NGN-ATWS CONDITION INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS P-MP113----M 6.42E-02 MTR-DRIVEN PP 113 OOS FOR MAINTENANCE N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 CutSet Number: . 2790 CutSet Frequency = 2.54E-09 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM

'NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED CutSet Number: 2791 CutSet Frequency - 2.54E-b?

Y-OORV-DEM-Z 1.00E 01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED CD 1.J0E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-2AC50-3 1 06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW ".CH4 ECU E208 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

.Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM CutSet Number: 2792 Cutset Frequency = 2.54E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

.INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399

'N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS 1.00E+00 DUMMY EVENT kVR NON-ATWS CONDITION Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM CutSet Number: 2793 CutSet Frequency - 2.54E-09

.Y-DORV-DEM-Z.1.00E-01 POST

• TRIP PRESSURIZER SAFETY VALVES DEMANDED Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 CD. .

1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS' INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND A-4 1

)

VALVE HV-6367 UNAVAILABLE i SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR )

CutSet. Number: 2900 CutSet Frequency ='2.40E-09 ,

NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION '

Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 N-MV6367---P.1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 j CD 1.00E+00' DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-2DG3015 1.00E-02 FIRE.IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D L

CutSet Number: 2901 Cutset Frequency - 2.40E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399

-CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM N-HV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CutSet Number: 2902 CutSet Frequency - 2.40E-09 )

N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 CutSet Number: 2903 CutSet Frequency - 2.40E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZ SAFETY VALVES DEMANDED Y-RV0201---N 3.00E-03 RELIEF VLV SPRING aD 0201 FT CLOSE ON DEM NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 CutSet Number: 2910 CutSet Frequency = 2.38E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-FNE399-1DR 2.40E-04 FAN E399 FT RUN FOR 24 H INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' I CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT l

A-5 L_

~

~_

' VALVE HV-6367 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Namber: 2983 ~ CutSet Frequency - 2.33E-09 NOATWS. 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HTE002-1DC 2.00E-04 HEAT X (TUBE) E002 PLUGGED / FOULED W/I 24 H P-HCBCKFLSHU 1.00E+00 OPERATOR FAILS TO BACKFLUSH HX 001A W/IN 24 HR N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-HV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE CutSet Number: 2984 CutSet Freg,ency = 2.33E-09 P-HTE002-1DC 2.00E-04 HEAT X.(TUBE) E002 PLUGGED / FOULED W/I 24 H CD 1.00E+00 DUMMY EVENT.FOR CORE DAMAGE CUTSETS INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' N-MV6367---P J .00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HCBCKFLSHU 1.00E+00 OPERATOR FAILS TO BACKFLUSH HX 001A W/IN 24 HR CutSet Number: 3095- CutSet Frequency = 2.22E-09 NOATWS- 1.00E+00 DUMMY EVENT POR NON-ATWS CONDITION Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT N-MV5371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED CutSet Number: -3096 CutSet Frequency = 2.22E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS'

'N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT CutSet Number: 3097 CutSet Frequency - 2.22E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-PCS- 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-MV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM l

1 i

A-6

VALVE HV-6367 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number: 3098 CutSet Frequency = 2.22E-09.

N-MV6370---M 4'.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE Y-RV0200 --N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

.N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT CutSet Number: 3222 CutSet Frequency - 2.09E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-HAXV208--X 8 00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION M-DUMMY 2---Z 1.00E+00 dummy event for sensativity for me-355 M-CHE-335--M 1.75E-02 CHILLER E-335 OOS FOR MAINTENANCE - LOOP B ESF H E-ZZ25TO26-K 1,00E+00 PUMP P025 NOT ALIGNED TO TRAIN A INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 CutSet Number: 3223 .CutSet Frequency = 2.09E-09 N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 NOATWS 1.00E+00' DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND M-CHE-335--M 1.75E-02 CHILLER E-335 OOS FOR MAINTENANCE - LOOP B ESP H CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS E-ZZ25TO26-K 1.00E+00 PUMP P025 NOT ALIGNED TO TRAIN A M-DUMHY2---Z 1.00E+00 dummy event for sensativity for me-355 CutSet Number: 3269 CutSet Frequency = 2.03E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-HTE002-1DC 2.00E-04 HEAT X (TUBE) E002 PLUGGED / FOULED W/I 24 H P-HCBCKFLSHU 1.00E+00 OPERATOR FAILS TO BACKFLUSH HX 001A W/IN.24 HR N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE

'INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND J CutSet. Number: 3349 CutSet Frequency = 1.96E-09 P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-ML 7.10E-05 INITIATING EVENT ML FOR EVENT TREE 'SO2ML' N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CutSet Number: 3350 CutSet Frequency = 1.96E-09  ;

P-HTE002---M 3.4 5E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT  ;

N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND l CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS l

.INIT-ML 7.10E-05 INITIATING EVENT ML FOR EVENT TREE 'SO2ML' N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 A-7

VALVE HV-6367 UNAVAILABLE )

SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR l 1

.CutSet Numberi L3387 CutSet Frequency'- 1.94E-09 P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD OT)1 FT CLOSE ON DEM Y-OORV-DEM-Z.1.00E-01' POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED

'NOATWS '1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-PCS' _5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE

.CutSet Number: 3388 CutSet Frequency = 1.94E-09 P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE Y-RV0200---N 3.00E-03 RELIEF VLV SPRING-LOAD 0200 FT CLOSE ON DEM Y-OORV-DEM-Z l.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N.MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-PCS 5.30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION CutSet Number: 3716 CutSet Frequency = 1.70E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS U-DG2G3--85R 2.82E-02 DIESEL GENERATOR 2G3 FT RUN - TRAIN B ESF POWER NOLOP 1.00E+00 DUMMY EVENT FOR NO LOSP NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

'INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE 2G3-FAILS 1.00E+00 No description provided N-HV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND -

CutSet Number: 3717 CutSet Frequency - 1.70E-09 N-MV6371---M 4.04E-03 MOTOR OPERATED VALVE 6571 OOS DUE TO MAINTENANCE U-DG2G3--8HR 2.82E-02 DIESEL GENERATOR 2G3 FT RUN - TRAIN B ESF POWER NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND

~INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 CD' 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS 2C3-FAILS 1.00E+00 No description provided NOLOP: 1.00E+00 DUMMY EVENT FOR NO LOSP CutSet Number: 4124 CutSet Frequency = 1.48E-09 N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE 2U-DG2G3--8HR 2.82E-02 DIESEL GENERATOR 2G3 FT RUN - TRAIN B ESF POWER NOLOP 1.00E+00 DUMMY EVENT FOR NO LOSP N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS 2G3-FAILS 1.00E+00 No description provided NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION I

A-8

r VALVE HV-6367 UNAVAILABLE

SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number: 4308 CutSet Frequency = 1.40E-09 NOATWS 1.00E+00 DCMMY EVENT FOR !;ON- ATWS CONDITION CD- 1.00E+00 DUMMY' EVENT'FOR CORE DAMAGE CUTSETS P-MP113----M 6.42E-02 MTR-DRIVEN PP 113 OOS FOR MAINTENANCE P-MP114--lDR 1.87E-03 MTR-DRIVEN PP 114FT RUN FOR 24 HR INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL'

-N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND-N-MV6370---M.4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO.HAINTENANCE CutSet Number: 4309 'CutSet Frequency = 1.40E-09 CD 1 00E+00 DUMMY EVENT FOR CORE DAMAGE'CUTSETS INIT-SL 2.88E-03 INITIATING EVENT SL'FOR EVENT TREE 'SO2SL' N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-MV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION P-MP113----M.6.42E-02 MTR-DRIVEN PP 113 OOS FOR MAINTENANCE P-MP114--1DR 1.87E-03 MTR-DRIVEN PP 114FT RUN FOR 24 HR Cutset Number: 4329 CutSet Frequency = 1.38E-04 P-HTE002-1DC 2.00E-04 HEAT X (TUBE) E002 PLUGGED / FOULED W/I 24 H P-HCBCKFLSHU 1.00E+00 OPERATOR FAILS TO BACKFLUSH HX 001A W/IN 24 HR NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6371---P 2.40E-03 MTR-OPERATED VLV 6371 FT OPEN ON DEMAND.

.N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6?67 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' t

CutSet Number

. 4481 CutSct Frequency = 1.32E-09 N-HV6371---P 2.40E-03 MTR-OPERATED VLV 6371 FT OPEN ON DEMAND Y-DORV-DEM-Z 1.00E-01 POST-TRIP-PRESSURIZER SAFETY VALVES DEMANDED CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-PCS 5.30E-01' INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' l

Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT' TREATMENT CutSet Number: 4482 CutSet Frequency = 1.32E-09

! NOATWS . 1 00E+00 DUMMY EVENT FOR NON-ATWS CONDITION I Y-RV0201 --N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM

! Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED l P-HTE002---M 3.45E-03 HEAT EXCHANGER E002 OOS FOR HEAT TREATMENT l N-HV6367---P 1 00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CD 1.00E+00 DUMMY' EVENT FOR CORE DAMAGE CUTSETS INIT-PCS 5. 30E-01c INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' N-MV6371---P 2.40E-03 MTR-OPERATED VLV 6371 FT OPEN ON DEMAND CutSet Number: 4573 CutSet Frequency = 1.28E-09 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-HV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE Y-RV0201---N 3.00E-03' RELIEF VLV SPRING LOAD 1201 FT CLOSE ON DEM INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS NOATWS. 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION A-9 r

VALVE HV-6367 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number: 4574 'CutSet Frequency = 1.28E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION Y-RV0201---N 3.00E-03 RELIEF VLV SPPING LOAD 0201 FT CLOSE ON DEM Y-DORV-DEM-Z'1,00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE

'N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE CutSet Number: 4575 CutSet Frequency = 1.28E-09 INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM

.NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-MV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAIFTENANCE CutSet Number: 4576 CutSet Frequency = 1.28E-09 Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM

'CD _

1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-2AC50-3 1.06E 03 FIRE IN-2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-HV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE NOATWS 1.00E+00 DITMMY EVENT FOR NON-ATWS CONDITION Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED CutSet Number: 4765 CutSet Frequency = 1.22E-09 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND P-MP114--1DR'1.87E-03 MTR-DRIVEN PP 114FT RUN FOR 24 HR

.NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE INIT-SL 2.88E-03 INITIATING EVENT SL FOR EVENT TREE 'SO2SL' CD 1.00EF00 DUMMY EVENT FOR CORE DAMAGE CUTSETS l P-MP113----M 6.42E-02 MTR-DRIVEN PP 113 OOS FOR MAINTENANCE CutSet Number: 4774 CutSet Frequency = 1.21E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM I Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 l' NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 dCENARIO 2 - LARGE FIRE IN D N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CutSet Number: 4775 CutSet Frequency = 1.21E-09 NOATWS 1.00E+00 DUMMY EVENT.FOR NON-ATWS CONDITION Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

-INIT-2DG3015 1.00E-02' FIRE IN 2-DG-50-155 SCENARIO 2 - LARGE FIRE IN D N-MV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE i

A-10 l J

l ru _)

VALVE HV-6367 UNAVAILMLE SELECTED CDF SEQUENCE CUTSETS >1.?E-9 /YR

'CutSet Number: 4776 CutSet Frequency = 1.21E-09 NOATWS 1.00E+00 DUMMY EVENT.FOR NON-ATWS CONDITION Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM URECB2A06--Z'1.00E-01 REVISE PROCEEDURE.S023-13-21 TO RECOVER 2A06 N-MV6371---M-4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE L .N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND

! INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D

( CD '1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS j Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED I

CutSet Number: 4777-

~

CutSet Frequency = 1.21E-09 INIT-2DG3015-1.00E-02 FIRE-IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

.N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE CutSet Number: 5140 CutSet Frequency = 1.12E-09 N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT.CLOSE ON DEM Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-HV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION CutSet Number: 5141 CutSet Frequency - 1.12E-09 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND

Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION INIT-2AC50-3 1 06E-03. FIRE.IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS I Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE CutSet. Number

5219 CutSet Frequency = 1.10E-09

.ZO. 1,30E-04 OPERATOR FAILS TO TRIP RCP WITHIN 30 MINUTES CD' 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETF INIT-2AC50-3'1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - S' oR LARGE r' IRE N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - Crd TO ECU E399 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION CutSet Number: 5220 CutSet Frequency = 1.10E-09 Z0 1.30E-04 OPERATOR FAILS TO TRIP RCP WITHIN 30 MINUTES NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-HAXV208--X-8.00E-03' MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 CD .1. 00E+00 DUMNY EVENT FOR CORE DAMAGE CUTSETS INIT-2AC50-3 1.06E-03 FIRE IN 2-AC-50-35 SCENARIO 2 - SWGR LARGE FIRE A-11 9 c:

VALVE HV-6367 UNAVAILABLE SELECTED CDF SEQUENCE.CUTSETS >1.0E-9 /YR

.CutSet-Number: 5391 CutSet Frequency = 1.06E-09 URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

-Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

.N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND

'itSet Number: 5392 CutSet Frequency = 1.06E-03 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND Y-OORV-DEM-Z'1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED

-NOATWS -1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM N-FNE399---M 3.53E-03 FAN E399 OOS FOR MAINTENANCE INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS URECD2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Cutset Number: 5408 CutSet Frequency = 1.05E-09 N-MV6370---M 4.04E-03 MOTOR OPERATED VALVE 6370 OOS DUE TO MAINTENANCE NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-HV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND M-DUMMY 2---Z 1.00E+00 dummy event for sensativity for me-355 M CHE-335--M 1.75E-02 CHILLER E-335 OOS FOR MAINTENANCE - LOOP B ESF H

.INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 E-ZZ25TO26-K 1.00E+00 PUMP P025 NOT ALIGNED TO TRAIN A CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet Number: 5409 CutSet Frequency = 1.05E-09 NOATWS 1.00E+00 DUMMY EVENT FOR-NON-ATWS CONDITION E-ZZ25TO26-K 1.00E+00 PUMP P025 NOT ALIGNED TO TRAIN A INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP .SDS 2 M-CHE-335--M 1.75E-02 CHILLER E-335 OOS FOR MAINTENANCE - LOOP B ESF H

.M-DUMMY 2---Z 1.00E+00 dummy event for sensativity for me-355 N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367-FT OPEN ON DEMAND N-MV6371---M 4.04E-03 MOTOR OPERATED VALVE 6371 OOS DUE TO MAINTENANCE CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet. Number: 5465 CutSet Frequency = 1.04E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Z0 1.30E-04 OPERATOR FAILS TO TRIP RCP WITHIN 30 MINUTES N-HAXV207--X 8.00E-03 MANUAL VALVE 207 MISALIGNED - CCW TO ECU E399 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND l

A-12 i

I VALVE HV-6367 UNAVAILABLE

[

l SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR I

CutSet Number: 5466 CutSet Frequency - 1.04E-09 URECB2A06--Z 1.00E-01 REVISE PROCEEDURE S023-13-21 TO RECOVER 2A06 Z0 1.30E-04 OPERATOR FAILS TO TRIP RCP WITHIN 30 MINUTES l NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND N-HAXV208--X 8.00E-03 MANUAL VALVE 208 MISALIGNED - CCW FROM ECU E208 INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-155 SCENARIO 2 - LARGE FIRE IN D CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS l

CutSet Number: 5605 CutSet Frequency = 1.01E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION 2G3-FAILS 1.00E+00 No description provided NOLOP 1.00E+00 DUMMY EVENT FOR NO LOSP U-DG2G3--8HR 2.82E-02 DIESEL GENERATOR 2G3 FT RUN - TRAIN B ESF POWER N-MV6367---P 1.00E+00 MTR-OPERATED VLV 6367 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-SEIS5 1.49E-05 SEISMIC EVENT LEADING TO SMALL LOCA, LOP - SDS 2 N-MV6371---P 2.40E-03 MTR-OPERATED VLV 6371 FT OPEN ON DEMAND A-13 i

VALVE HV-6367 UNAVAILABLE SELECTED LERF SEQUENCE CUTSETS >1.0E-9 /YR SMCUTSET.EXE V1.2 - Southern California Edison Company CutSet Report: 3/12/99 09:35 Total Frequency - 5.75E-07 ,

J No LEkF sequence cutsets, including HV-6367 failure, >1.0E-9 /yr.

A-14 i

I

)

i I

VALVE HV-9367 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR SMCUTSET.EXE V1.2 - Southern California Edison Company CutSet Report: 3/12/99 10:37 Total Frequency = 7.69E-05 No CDF sequence cutsets, including HV-9367 failure, >1.0E-9 /yr.

i i

I l

i A-15 s

[

l l

i l

VALVE HV-9367 UNAVAILABLE.

SELECTED LERF SEQUENCE CUTSETS >1.0E-9 /YR l

l SMCUTSET.EXE V1.2 - Southern California Edison Company l

CutSet Report: 3/12/99 10:48 l

[

. Total Frequency = 5.75E-07 No LERF sequence cutsets, including HV-9367 failure, >1.0E-9 /yr.

i A-16 i

k VALVE HV-9200 UNAVAILABLE S5LECTED CDF SEQUENCE CUTSETS >1,0E-9 /YR SMCUTSET.EXE V1.1 - Southern California Edison Company CutSet Report: 3/11/99 10:03.

Total Frequency - 7.70E-05 L< . CutSet Number: 1899 CutSet Frequency = 4.20E-09

! K-OOMECHSCRM 1.00E-05 MECHANICAL FAILURE OF THE'RPS TO SCRAM ATWS . 1.00E+00 DUMMY EVENT FOR ATWS CONDITION Z126-1COMPLE 7.37E-01 COMPLEMENT OF Z126-1 (ATWS EVENT)

Z250-2COMPLE 9.50E-01. COMPLEMENT OF Z250-2 (ATWS EVENT)

CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

'D-AV9200-1DQ 3.00E-04 AIR-OPERATED VLV 9200 FT REM OPEN 24 H

-INIT-TT 2.00E+00 INITIATING EVENT.TT FOR. EVENT TREE 'SO2TT' l

CutSet Number: 3916 CutSet Frequency = 1.58E-09

.INIT-TT. 2.00E+00 INITIATING EVENT TT FOR EVENT TREE 'SO2TT' K-OOMECHSCRM 1.00E-05 MECHANICAL FAILURE OF THE RPS TO SCRAM Z126-1 2.63E-01 POWER LEVEL GREATER THAN 20% (ATWS EVENT)

D-AV9200-1DQ 3.00E-04 AIR-OPERATED VLV 9200 FT REM OPEN 24 H ATWS 1.00E+00 DUMMY EVENT FOR ATWS CONDITION CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet Number: 4'465 CutSet Frequency - 1.30E-09

-CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS D-AV9200-1DQ 3.00E-04 AIR-OPERATED VLV 9200 FT REM OPEN 24 H H-MPCC0001-S 4.33E-04 COMMON CAUSEFAILURE -MP-S --> 017, 018, AND 019 INIT-SGR 1.00E-02 INITIATING EVENTSGR FOR EVENT TREE 'SO2SGR' NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION

'CutSet Number: 5101 'CutSet Frequency = 1.11E-09 D-AV9200-1DO 3.00E-04 AIR-OPERATED VLV 9200 FT REM OPEN 24 H Z126-1COMPLE 7.37E-01 COMPLEMENT OF Z126-1 (ATWS EVENT)

INIT-PCS 5,30E-01 INITIATING EVENTPCS FOR EVENT TREE 'SO2PCS' Z250-2COMPLE 9.50E-01 COMPLEMENT OF Z250-2 (ATWS EVENT)'

CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

-ATWS 1.00E+00 DUMMY EVENT FOR-ATWS CONDITION K-OOMECHSCRM 1,00E-05 MECHANICAL FAILURE OF THE RPS TO SCRAM l

I A-17 i

F.'

VALVE HV-9200 UNAVAILABLE SELECTED LERF SEQUENCE CUTSETS >1.0E-9 /YR SMCUTSET.EXE V1.1 - Southern California Edison Company CutSet Report: 3/11/99 11:47 Total Frequency - 5.76E 07 CutSet Number: 130 CutSet Frequency - 1.30E-09 D-AV9200-1DO 3.00E-04 AIR-OPERATED VLV 9200 FT REM OPEN 24 H H-MPCC0001-S 4.33E-04 COMMON CAUSEFAILURE -MP-S --> 017, 018, AND 019 ,

INIT-SGR 1.00E-02 INITIATING EVENTSGR FOR EVENT TREE 'SO2SGR' LERP 1.00E+00 DUMMY EVENT TO DENOTE LERF CUTSETS

.NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION I

I A-18

[I VALVE HV-9323 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR SMCUTSET.EXE V1.2 - Southern California Edison Company CutSet Report: 3/12/99 11:31 Total Frequency = 7.69E-05 No CDF sequence cutsets, including HV-9323 failure, >1.0E-9 /yr.

A-19 L

l VALVE HV-9323 UNAVAILABLE  :

SELECTED LERF SEQUENCE CUTSETS >1.0E-9 /YR l SMCUTSET.EXE V1.2 - Southern California Edison Company CutSet Report' 3/12/99 11:41 I

Total Frequency = 5.75E-07 i No LERP sequence cutsets, including HV-9323 failure, >1.0E-9 /yr.

A-20 i

i l

l

VALVE HV-9322 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR SMCUTSET.EXE V1.1 - Southern California Edison Company CutSet Report: 3/10/99 11:00 Total Frequency = 7.75E-05 CutSet Number: 224 CutSet Frequency = 4.18E CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9331---P 2.57E-03 MTR-OPERATED VLV 9331 FT OPEN ON DEMAND A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND Z-DOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A CutSet Number: 225 Cutset Frequency - 4.18E-08 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND A-MV9328---P 2.57E-03 MTR-OPERATED VLV 9328 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-1BZ 2.50E-01 LOCA OCCURS IN RCS LOOP IB CutSet Number: 226 CutSet Frequency = 4.18E-08 INIT-LL .

6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-DOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A

-A-MV9325---P 2.57E-03 MTR-OPERATED VLV 9325 FT OPEN ON DEMAND A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT POR CORE DAMAGE CUTSETS CutSet Number: 227 CutSet Frequency = 4.18E-08 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND A-MV9325---P 2.57E-03 MTR-OPERATED VLV 9325 FT OPEN ON DEMAND CD 1. 00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B CutSet Number: 228 CutSet Frequency = 4.18E-08

-INIT-LL - 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-DOLOCA-1BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 1B CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-MV9331---P 2.57E-03 MTR-OPERATED VLV 9331 FT OPEN ON DEMAND A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 229 Cutset Frequency = 4.18E-08 A-MV9328---P 2.57E-03 MIR-OPERATED VLV 9328 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS i INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 275 Cutset Frequency - 3.40E-08 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9328---M 2.09E-03 MTR-OPTD VLV 9328 OOS FOR MAINTENANCE - RCS LOOP A-MV9322---P 1 00E+00 MTR-OPERATED VLV 9322 FT.OPEN ON DEMAND

-Z-DOLOCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B A-21

r VALVE HV-9322 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number: '276 . CutSet Frequency 2.40E-08 A-MV9322---P 1;00E+00 MTR-OPERATED VLV 9324 FT OPEN.ON DEMAND A-MV9325---M 2.09E-03 MTR-OPTD VLV 9325 OOS FOR MAINTENANCE - RCS LOOP CD: ~

1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

.INIT-LL- 6.50E-05 INITIATING EVENT ~LL FOR EVENT. TREE 'SO2LL'

Z-OOLOCA-2AZ-2.50E-01 LOCA OCCURS IN RCS LOOP 2A

,CutSet Number: 277 CutSet Frequency = 3.40E-08.

Z-OOLOCA-2BZ-2iSOE-01 LOCA OCCURS IN RCS LOOP 2B A-HV9322---P.1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND '

A-MV9325---M 2.09E-03 MTR-OPTD VLV 9325 OOS FOR MAINTENANCE - RCS LOOP

,CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS .

INIT-LL- 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' CutSet Number: 278 CutSet Frequency = 3.40E-08 INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-1BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 1B A-MV9331---M 2.09E-03 MTR-OPTD VLV 9.~31 OOS FOR MAINTENANCE - RCS LOOP A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD. 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

'CutSet. Number: 279 CutSet Frequency = 3.40E-08 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND A-HV9331---M 2.09E-03 MTR-OPTD VLV 9331 OOS FOR MAINTENANCE - RCS LOOP CD. 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A CutSet Number: 280. CutSet Frequency - 3.40E-08 INIT-LL 6.50E-05 INITIATING EVENT.LL FOR EVENT TREE 'SO2LL' Z-DOLOCA-1BZ 2.50E-01'LOCA OCCURS IN RCS LOOP 1B CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-MV9328---M 2.09E-03 MTR-OPTD VLV 9328 OOS FOR MAINTENANCE - RCS LOOP A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 1472 CutSet Frequency = 5.72E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENTLLL FOR EVENT TREE 'SO2LL' A-MVCC0009-P 8.80E-05 COMMON CAUSEFAILURE -MV-P --> 9325 AND 9331 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 1473 CutSet Frequency = 5.72E-09 A-MVCC0008-P 8.80E-05 COMMON CAUSEFAILURE -MV-P --> 9325 AND 9328 f CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS  !

INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 1474 CutSet Frequency = 5.72E-09 INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAd9 A-MVCC0010-P 8.80E-05 COMMON CAUSEFAILURE -MV-P --> 9328 AND 9331 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS I

A-22 l I

i i

s VALVE HV-9322 UNAVAILABLE )

SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR )

-CutSet Number: 1682 ,Cutset Frequency = 4.88E-09 A-HV9322---P 1 00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND ZiviRCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B A-MSBE15---N.3.00E-04 MTR STARTER BE15 FT CLOSE ON DEMAND CD 1.00F+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' CutSet Number: 1683 CutSet Frequency = 4.88E-09 A-MSBJ11---N 3.00E-04 MTR STARTER BJ11 FT CLOSE ON DEMAND A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND

'CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL' 6.50E-05' INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-1BZ .2.50E-01 LOCA OCCURS IN RCS LOOP 1B '

CutSet Number: 1684 CutSet Frequency = 4.88E-09 A-MSBE14---N 3,00E-04 MTR STARTER BE14 FT CLOSE ON DEMAND Z-v0LOCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B INIT-LL' 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1,00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00. DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet Number: 1685 CutSet Frequency = 4.88E-09 A-MSBE14---N 3.00E-04 MTR STARTER BE14 FT CLOSE ON DEMAND Z-OOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT- FOR CORE DAMAGE CUTSETS l

CutSet Number: 1686 CutSet Frequency = 4.88E-09 A-MS9E15---N 3.00E-04 MTR STARTER BE15 FT CLOSE ON DEMAND A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE-CUTSETS INIT-LL '6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-1BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 1B CutSet Number: 1687 CutSet Frequency = 4.88E-09 A-MSBJ11---N 3.00E-04 MTR STARTER BJ11 FT CLOSE ON DEMAND

.Z-OOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD - 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet Number: 3861 CutSet Frequency = 1.62E-09 A-CV075----P 1.00E-04 CHECK VLV 075 FT OPE:' ON DEMAND A-HV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD ~1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A CutSet Number: 3862 CutSet Frequency = 1.62E INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND A-CV074----P 1.00E-04 CHECK VLV 074 FT OPEN ON DEMAND A-23

n VALVE HV-9322 UNAVAILABLE SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number: 3863 Cutset Frequency = 1.62E-09

'CD 1-.00E+00 DUMMY EVENT FOR; CORE DAMAGE CUTSETS H-CV029----P 1.00E-04 CHECK VLV 029 FT OPEN ON DEMAND INIT-LL 6.50E-05 INITIATING EVENT LL FOR' EVENT TREE 'SO2LL' Z-OOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A A-MV9322---P-1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: .3864 'CutSet Frequency = 1.62E-09 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD- 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS H-CV029----P.1.00E-04 CHECK VLV 029 FT OPEN ON DEMAND-

.INIT-LLL 6.50E 05 INITIATING' EVENT LL FOR EVENT TREE 'SO2LL'

~Z-OOLOCA-2BZ 2.50E-01=LOCA OCCURS IN RCS LOOP 2B CutSet Number: 3865 CutSet Frequency = 1.62E-09 Z-OOLOCA-1BZ 2.50E*01 LOCA OCCURS IN RCS LOOP 1B INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322-FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS H-CV033----P 1.00E-04 CHECK.VLV 033 FT OPEN ON DEMAND CutSet Number: 3866 CutSet Frequency - 1.62E-09 A-CV073----P 1.00E-04 CHECK VLV 073 FT OPEN ON DEMAND A*MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

INIT-LL 6.50E-05' INITIATING EVENT LL FOR EVENT TREE 'SO2LL'

'ZiOOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A CutSet Number: 3867 . Cut 6et Frequency.=-1.62E-09 Z-OOLOCA-1BZ 2.50E-03 LOCA OCCURS IF RCS LOOP 1B A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND

'CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS H-CV031----P 1.00E-04 CHECK VLV 0311FT OPEN ON DEMAND INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE *SO2LL' CutSet Number: 3868- CutSet Frequency = 1.62E-09 Z-OOLOCA-1BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 1B INIT-LL- 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' CD 1.00E+00~ DUMMY EVENT FOR CORE. DAMAGE CUTSETS

-A-CV074----P'1.00E-04 CHECK VLV 074 FT OPEN ON DEMAND A-MV9322-*-P 1.00E+00-MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 3869 CutSet Frequency = 1.62E-09 A-HV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS .

H-CV033----P 1.00E-04 CHECK VLV 033 FT OPEN ON DEMAND

INIT-LL ~6.50E-05' INITIATING EVENT LL FOR EVENT TREE 'SO2LL' Z-OOLOCA-2AZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2A CutSet Number: 38701 CutSet Frequency = 1.62E-09

-A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND Z-OOLOCA-1BZ 2.50E-01'LOCA OCCURS IN RCS LOOP 1B A-CV075----P 1.00E-04 CHECK VLV 075 FT OPEN ON DEMAND j

, INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-24

VALVE HV-9322 UNAVAILABLE-SELECTED CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number 3871 -CutSet Frequency = 1.62E-09 A-HV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD 1.00E+00 DUMMY EVENT FOR. CORE DAMAGE CUTSETS H-CV031* --P 1.00E-04 CHECK VLV 031 FT OPEN ON DEMAND INIT-LL - 6.50E-05 INITIATING EVENT:LL FOR EVENT TREE 'SO2LL' Z-DOLOCA-2BZ 2.50E-01 LOCA OCCURS IN RCS LOOP 2B CutSet Number: .3872 .CutSet Frequency.= 1.62E-09 A-CV073----P 1.00E-04 CHECK VLV 073 FT OPEN ON DEMAND INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN.ON DEMAND Z-OOLOCA-2BZ 2.50E-01 LOCA' OCCURS IN RCS LOOP 2B CD s1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS CutSet Number: 3994 CutSet Frequency.- 1.56E-09 CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS

.INIT-LL ;6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL'

. U-C3B04141DO 2.40E-05,BKR (CNTL).480V B0414 FT REM CLOSED 24 H A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CutSet Number: 3995 'CutSet Frequency = 1.56E-09.

A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD .

1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING (VENT LL FOR EVENT TREE 'SO2LL'

'U-C2A04201DO-2.40E-05 BKR (CNTL) (160V A0420 FT REM CLOSED 24 H CutSet Number: . 3996 Cutset Fro ; .ency = 1. 56E-09 CD . .

. 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE.'SO2LL' A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND U-T24X---1DR 2.40E-05 4160V-480V XFMR 4X FT OPERATE 24 H CutSet Number: 3997 Cutset Frequency - 1;56E-09 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND CD' 1.00E+00 DUMMY - EVENT FOR CORE DAMAGE CUTSETS INIT-LL 6.50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' U-C3B04011DO 2.40E-05 BKR (CNTL) 480V B0401 FT REM CLOSED 24 H CutSet Number: 4971. CutSet Frequency = 1.15E-09

.INIT-LL 6. 50E-05 INITIATING EVENT LL FOR EVENT TREE 'SO2LL' U-ZZCNDLP--Z l'.70E-03 CONDITIONAL LOSS OF OFFSITE POWER GIVEN TURBINE

'U-HCOSPWRO-U 3.70E-01. POWER NOT RECOVERED IN TIME AFTER CONDITIONAL PW LOCA' -1.00E+00 DUMMY FLAG EVENT TO INDICATE LOCA (SIAS)~CONDITI CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND

~2G2-FAILS' 1.00E+00 No description provided-U-DG2G2--8HR 2.82E-02 DIESEL GENERATOR 2G2 FT RUN - TRAIN A ESF POWER A-25 s

VALVE HV-9322 UNAVAILABLE SELECTED'CDF SEQUENCE CUTSETS >1.0E-9 /YR CutSet Number:f5330 CutSet Frequency - 1.06E-09 H-MP018----M 3.34E-02 PUMP 018 UNAVAILABLE DUE TO MAINTENANCE / TEST

'Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201'FT CLOSE ON DEM l Y-OORV-DEM-Z 1.00E-01' POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED l NOATWS. 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION l LH-ZZ18TO19-K 1.00E+00 P018 NOT ALIGNED TO TRAIN A-H-HCP19STRTU 1.00E-01 OP FTS STDBY HPSI PMP P019 (WHEN P018 ALIGNED TO l CD 1.00E+00' DUMMY EVENT POR CORE DAMAGE CUTSETS I

.A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND INIT-2AC50-4 1.06E-03 FIRE IN 2-AC-50-40 SCENARIO 2 - SWGR LARGE FIRE CutSet Number: 5331 CutSet Frequency - 1.06E-09 H-ZZl8TO19-K 1.00E+00 P018 NOT ALIGNED TO TRAIN A INIT-2AC50-4 1.06E-03 FIRE IN 2-AC-50-40 SCENARIO 2. - SWGR LARGE FIRE NOATWS' 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM H-HCP19STRTU 1.00E-01 OP FTS STDBY HPSI PMP P019 (WHEN P018 ALIGNED TO CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED H-MP018----H 3.34E-02 PUMP 018 UNAVAILABLE DUE TO MAINTENANCE / TEST CutSet Number: 5611 CutSet Frequency = 1.00E-09 NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION Y-RV0201---N 3.00E-03 RELIEF VLV SPRING LOAD 0201 FT CLOSE ON DEM URECB2A04--Z 1.00E-01' FAILURE TO RECOVER A04 FOLLOWING FIRE INIT-2DG3015 1.00E-02 FIRE IN,2-DG-30-158 SCENARIO 2 - LARGE FIRE IN D H-ZZ18TO19-K 1.00E+00 P018 NOT ALIGNED TO TRAIN A H-MP018----M 3.34E-02 PUMP 018 UNAVAILABLE DUE TO MAINTENANCE / TEST H-HCP19STRTU 1.00E-01 OP FTS STDBY.HPSI PMP P019 (WHEN P018 ALIGNED TO -

CD . .

1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS A-MV9322---P 1.00Et00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND Y-DORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED CutSet-Number: 5612 CutSet Frequency - 1.00E-09 A-MV9322---P 1.00E+00 MTR-OPERATED VLV 9322 FT OPEN ON DEMAND INIT-2DG3015 1.00E-02 FIRE IN 2-DG-30-158 SCENARIO 2 - LARGE FIRE IN D Y-OORV-DEM-Z 1.00E-01 POST-TRIP PRESSURIZER SAFETY VALVES DEMANDED URECB2A04--Z 1.00E-01 FAILURE TO RECOVER A04 FOLLOWING FIRE NOATWS 1.00E+00 DUMMY EVENT FOR NON-ATWS CONDITION H-ZZ18TO19-K 1.00E+00 P018 NOT ALIGNED TO TRAIN A-

-H-MP018----M 3.34E-02 PUMP 018 UNAVAILABLE DUE TO MAINTENANCE / TEST '

CD 1.00E+00 DUMMY EVENT FOR CORE DAMAGE CUTSETS Y-RV0200---N 3.00E-03 RELIEF VLV SPRING LOAD 0200 FT CLOSE ON DEM H-HCP19STRTU 1.00E-01 OP FTS STDBY HPSI PMP P019 (WHEN P018 ALIGNED TO j I

A-26

p. ,

l 4

l VALVE HV-9322 UNAVAILABLE SELECTED LERF SEQUENCE CUTSETS >1.0E-9 /YR  !

SMCUTSET.EXE V1.1 - Southern California Edison Company f CutSet Report: 3/10/99 17:01 Total Frequency = 5.75E-07

[ No LERP sequence cutsets, including HV-9322 failure, >1.0E-9 /yr. '

l l

l 1

A-27