ML18151A242
| ML18151A242 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 06/30/1994 |
| From: | Dennis Bley, Bozoki G, Chu T, Dang V, Diamond D, Holmes B, Caroline Hsu, Ilberg D, Dante Johnson, Kohut P, Lin J, Musicki Z, Nathan Siu, Su R, Wong S, Yang J AEA TECHNOLOGY, BROOKHAVEN NATIONAL LABORATORY, MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, PLG, INC. (FORMERLY PICKARD, LOWE & GARRICK, INC.), SOREQ NUCLEAR RESEARCH CENTER, YAVNE, ISRAEL |
| To: | NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| References | |
| CON-FIN-L-1922 BNL-NUREG-52399, NUREG-CR-6144, NUREG-CR-6144-V02P3A, NUREG-CR-6144-V2P3A, NUDOCS 9408150228 | |
| Download: ML18151A242 (560) | |
Text
{{#Wiki_filter:NUREG/CR-6144 BNL-NUREG-52399 Vol. 2, Part 3A Evaluation of Potential Severe Accidents During Low Power and Shutdown Operations at Surry, Unit 1 Analysis of Core Damage Frequency from ernal Events During Mid-Loop Operations Appendix E (Sections E.1-E.8) Prepared by T. L. Chu, Z. Musicki, P. Kohut, D. Bley, J. Yang, B. Holmes, G. Bozoki, C. J. Hsu, D. J. Diamond, D. Johnson, J. Lin, R. F. Su, V. Dang, D. Ilberg, S. M. Wong, N. Siu Brookhaven National Laboratory Prepared for U.S. Nuclear Regulatory Commission ( 9408150228 940630 I PDR ADOCK 05000280 P PDR
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NUREG/CR-6144 BNL-NUREG-52399 Vol. 2, Part 3A Evaluation of Potential Severe Accidents During Low Power and Shutdown Operations at Surry, Unit 1 Analysis of Core Dijmage Frequency from Internal Events During Mid-Loop Operations endbc E (Sections E.1-E.8) Manuscript Completed: January 1994 Date Published: June 1994 Prepared by T. L. Chu, Z. Musicki, P. Kohut, D. Bley1, J. Yang, B. Holmes2 , G. Bozoki, C. J. Hsu, D. J. Diamond, D. Johnson1, J. Lin1, R. F. Su3, V. Dang3, D. Ilberg4, S. M. Wong, N. Siu3 Brookhaven National Laboratory Upton, NY 11973 Prepared for Division of Safety Issue Resolution Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 NRC FIN L1922 Inc., 4590 MacArthur Boulevard, Newport Beach, CA 92660-2027 Technology, Winfrith, Dorchester, Dorset, England, DT2 8DH 3MIT, Cambridge, MA 02139 (N. Siu currently at EG&G, Idaho Falls, ID 83415) 4Soreq Nuclear Research Center, Yavne 70600, Israel
ABSTRACT Traditionally, probabilistic risk assessments (PRA) of severe accidents in nuclear power plants have considered initiating events potentially occurring only during full power operation. Some previous screening analyses that were performed for other modes of operation suggested that risks during those modes were small relative to full power operation. However, more recent studies and operational experience have implied that accidents during low power and shutdown could be significant contributors to risk. During 1989, the Nuclear Regulatory Commission (NRC) initiated an extensive program to carefully examine the potential risks during low power and shutdown operations. The program includes two parallel projects being performed by Brookhaven National Laboratory (BNL) and Sandia National Laboratories (SNL). Two plants, Surry (pressurized water reactor) and Grand Gulf (boiling water reactor), were selected as the plants to be studied. The objectives of the program are to assess the risks of severe accidents initiated during plant operational states other than full power operation and to compare the estimated core damage frequencies, important accident sequences and other qualitative and quantitative results with those accidents initiated during full power operation as assessed in NUREG-1150. The scope of the program includes that of a level-3 PRA. The objective of this volume of the report is to document the approach utilized in the level-1 internal events PRA for the Surry plant, and discuss the results obtained. A phased approach was used in the level-1 rogram. In phase 1, which was completed in Fall 1991, a coarse screening analysis examining accidents itiated by internal events (including internal fire and flood) was performed for all plant operational states (POSs). The objective of the phase 1 study was to identify potential vulnerable plant configurations, to characterize (on a high, medium, or low basis) the potential core damage accident scenarios, and to provide a foundation for a detailed phase 2 analysis. In phase 2, mid-loop operation was selected as the plant configuration to be analyzed based on the results of the phase 1 study. The objective of the phase 2 study is to perform a detailed analysis of the potential accident scenarios that may occur during mid-loop operation, and compare the results with those of NUREG-1150. The scope of the level-1 study includes plant damage state analysis, and uncertainty analysis. Volume 1 summarizes the results of the study. Internal events analysis is documented in Volume 2. It also contains an appendix that documents the part of the phase 1 study that has to do with POSs other than mid-loop operation. Internal fire and internal flood analyses are documented in Volumes 3 and 4. A separate study on seismic analysis, documented in Volume 5, was performed for the NRC by Future Resources Associates, Inc. Volume 6 documents the accident progression, source terms, and consequences analysis. In the phase 2 study, system models applicable for shutdown conditions were developed and supporting thermal hydraulic analysis were performed to determine both the timing of the accidents and success criteria for systems. Initiating events that may occur during mid-loop operations were identified and accident sequence event trees were developed and quantified. In the preliminary quantification of the mid-loop accident sequences, it was found that the decay heat at which the accident initiating event occurs is an important parameter that determines both the success criteria for the mitigating functions and the time available for operator actions. In order to better account for the decay heat, a "time window" approach was iii NUREG-CR/6144
developed. In this approach, time windows after shutdown were defined based on the success criteri. established for the various methods that can be used to mitigate the accident. Within each time window, the decay heat and accident sequence timing are more accurately defined and new event trees developed and quantified accordingly. Statistical analysis of the past outage data was performed to determine the time at which a mid-loop condition is reached, and the duration of the mid-loop operation. Past outage data were used to determine the probability that an accident initiating event occurs in each of the time windows. This probability is used in the quantification of the accident sequences. The mean core damage frequency of the Surry plant due to internal events that may take place during mid-loop operations is SE-06 per year, and the 5th and 95th percentiles are 5E-07 and 2E-05 per year, respectively. This can be compared with the mean core damage frequency from internal events of 4E-05 per year estimated in the NUREG-1150 study for full power operations. NUREG/CR-6144 iv
Contents Appendix E Event Trees and Their Associated High Level Fault Trees V NUREG/CR-6144
- FOREWORD (NUREG/CR-6143 and 6144)
Low Power and Shutdown Probabilistic Risk Assessment Program Traditionally, probabilistic risk assessments (PRA) of severe accidents in nuclear power plants have considered initiating events potentially occurring only during full power operation. Some previous screening analysis that were performed for other modes of operation suggested that risks during those modes were small relative to full power operation. However, more recent studies and operational experience have implied that accidents during low power and shutdown could be significa~t contributors to risk. During 1989, the Nuclear Regulatory Commission (NRC) initiated an extensive program to carefully examine the potential risks during low power and shutdown operations. The program includes two parallel projects performed by Brookhaven National Laborat01y(BNL) and Sandia National Laboratories(SNL), with the seismic analysis performed by Future Resources Associates. Two plants, Surry (pressurized water reactor) and Grand Gulf (boiling water reactor), were selected as the plants to be studied. The objectives of the program are to assess the risks of severe accidents due to internal events, internal fires, internal floods, and seismic events initiated during plant operational states other than full power operation and to compare the estimated core damage frequencies, important accident sequences and other qualitative and quantitativeresults with those accidents initiated during full power operation as assessed in NUREG-1150. The scope of the program includes that of a level-3 PRA The results of the program are documented in two reports, NUREG/CR-6143 and 6144. The reports are anized as follows: or Grand Gulf: NUREG/CR-6143 - Evaluation of Potential Severe Accidents during Low Power and Shutdown Operations at Grand Gulf, Unit 1 Volume 1: Summary of Results Volume 2: Analysis of Core Damage Frequency from Internal Events for Operational State 5 During a Refueling Outage Part 1: Main Report Part 1A: Sections 1 - 9 Part 1B: Section 10 Part lC: Sections 11 - 14 Part 2: Internal Events Appendices A to H Part 3: Internal Events Appendices I and J Part 4: Internal Events Appendices K to M Volume 3: Analysis of Core Damage Frequency from Internal Fire Events for Plant Operational State 5 During a Refueling Outage Volume 4: Analysis of Core Damage Frequency from Internal Flooding Events for Plant Operational State 5 During a Refueling Outage Volume 5: Analysis of Core Damage Frequency from Seismic Events for Plant Operational State 5 During a Refueling Outage vii NUREG/CR-6144
Foreword (continued) Volume 6:
- Evaluation of Severe Accident Risks for Plant Operational State 5 During a Refueling Outage Part 1: Main Report Part 2: Supporting MELCOR Calculations For Surry:
NUREG/CR-6144- Evaluation of Potential Severe Accidents during Low Power and Shutdown Operations at Surry Unit-1 Volume 1: Summary of Results Volume 2: Analysis of Core Damage Frequency from Internal Events during Mid-loop Operations Part 1: Main Report Part lA: Chapters 1 - 6 Part lB: Chapters 7 - 12 Part 2: Internal Events Appendices A to D Part 3: Internal Events Appendix E Part 3A: Sections E.1 - E.8 Part 3B: Sections E.9 - E.16 Part 4: Internal Events Appendices F to H Part 5: Internal Events Appendix I Volume 3: Analysis of Core Damage Frequency from Internal Fires during Mid-loop Operations Part 1: Main Report Part 2: Appendices Volume 4: Analysis of Core Damage Frequency from Internal Floods during Mid-loop Operations Volume 5: Analysis of Core Damage Frequency from Seismic Events during Mid-loop Operations Volume 6: Evaluation of Severe Accident Risks during Mid-loop Operations Part 1: Main Report Part 2: Appendices NUREG/CR-6144 viii
-- APPENDIX E EVENT TREES AND TIIEIR ASSOCIATED HIGH LEVEL FAULT TREES
- E-1
APPENDIXE EVENT TREES AND 11-IEIR ASSOCIATED HIGH LEVEL FAULT TREES Page E.l Event Trees and High Level Fault Trees for Over Draining . to Mid-loop (RHR2A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3 E.2 Event Trees and High Level Fault Trees for Loss of Inventory (RHR2B) . . . . . . . . . . . . . . E-60 E.3 Event Trees and High Level Fault Trees for Non-Recoverable Loss of RHR (RHR3) ........................................ : ............... E-117 E.4 Event Trees and High Level Fault Trees for Loss of Operation Train of RHR (RHR4) ............................................. ~ ..... E-166 E.5 Event Trees and High Level Fault Trees for Recoverable Loss of RHR (RHR5) . . . . . . . . E-219 E.6 Event Trees and High Level Fault Trees for Loss of Offsite Power (Ll) E-272 E.7 Event Trees and High Level Fault Trees for Loss of Offsite Power (L2) E-368 E.8 Event Trees and High Level Fault Trees for Unit 1 Blackout (L3) . . . . . . . . . . . . . . . . . . . E-45 E.9 Event Trees and High Level Fault Trees for Two Unit Blackout (Bl) E.10 Event Trees and High Level Fault Trees for Two Unit Blackout (B2) E-592 E.11 Event Trees and High Level Fault Trees for Loss of 4KV Bus (4K) . . . . . . . . . . . . . . . . . . E-618 E.12 Event Trees and High Level Fault Trees for Loss of Vital Bus (VB) E-701 E.13 Event Trees and High Level Fault Trees for Spurious Safety Injection Signal (SI) ............................................... <* . . . . . E-784 E.14 Event Trees and High Level Fault Trees for Loss of Component Cooling Water (AR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-867 E.15 Event Trees and High Level Fault Trees for Loss of Instrument Air (Cq . . . . . . . . . . . . . E-910 E.16 Event Trees and High Level Fault Trees for Loss of Switchgear Room Cooling (SR) . . . . . E-967 E-2
Appendix E.1 Event Trees and High Level Fault trees for Over Draining to Mid-loop(RHR2A)
- E-3
UNITY IRAWl MRAW! RRAWl VWl SRAW1 FRAW1 GRAW! CRAW! SEQ # END-ST TE-1 OK 2 OK 3 OK 4 CD 5 CD 6 CD 7 OK 8 OK g CD 10 CD 11 OK 12 CD 13 CD 14- CD 15 OK 16 OK 17 CD 18 CD RAW 1R6 Event Tree
UNITY IRAWJ MRAW! RRAWl FRAWlV CRAWlV END-STATE-NAMES
- 1 OK 2 OK 3 OK 4 CD 5 CD tTl 6
7 OK CD 8 CD RAW1D6 Event Tree
Top Event for Loss of Instrument Air Window 1 FREQ-AIR tTl I 0\ DURATION-RO REFUEL POS--R10 FRAC--f'OS10 PROB-WR-.:> p POS-R6 PROB-WR6 DLAAT10N-R6 REFlB. DR-MT DLAATION-D6 PROB-Wtl6 POS-06
RCS Makeup Window 1 RCS Makeup in RHR2A in Window 1 tT1 .:..i Failure to Diagnose Failure to Makeup Over Draining Given Over Draining in Window 1 in Window 1 D-RAW1-XHE A-RAW1-XHE-M-12 FAIL HIGH PRES INSUF FLOW FRM FAL HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG- 2 LOW PRES SI FLOW TO CLO LEG- 2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS D2HLG LPIHLG 02 06-C
Restore RHR given RHR2B Window 1 Restore RHR Given RHR28 in Window 1 tTl 1 00 Foilure lo Restore Foilure lo Diagnose Loss of RHR (Ner Draining "Event POSs 3-13 RHR, given RHRB in Window 1 in Window 1 W3-S A-RAWl-XHE-R-4 D-RAW1-XHE
- Sof ety Valves Not Removed Window 1 Safety Valves Nol Removed in Window 1 POS 6 of a Drained Maintenance Outage POS-R10 POS-D6 POS 6 of a Refuelin Outage POS-R6 Pressurizer Safety Valves Removed in W1R6 PZR-SV-REMOVEDW1
Reflux Cooling Window 1 Foilure lo Diagnose RCS Loops Isolated Over Draining Event lo Couse Fallure in Window 1 of Reflux Cooling IS0-W1 mI D-RAW1-XHE 0 INSUF FLOW TO Operator Failure SG FRM AT LEAST to Feed SGs in 1 AFW PUMP Window 1-RHR2A LSW1 SRA 1G3 . A-RAW1-XHE-SF-9 FAL TO QOSE - FALURE OF BOTH PORVS SECONDARY SIC HEAT REMOVAL SSHW1 PORV1 SSHW1 A-RAW1-XHE-S1-9 A-RAW!-XHE-S.?-9
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 1 tTl I NO a.cs SIGWJ.. of o Refueling OPER OR AUTO Outage TRAIN A POS-D6 POS--R10 POS-R6 Loops Isolated in al window 1 of R10 LOOPISO...ATED 06 SGS-DRAIN£0--CSD SGS-DRAINED-R LOOP150...ATErn 1R 10 L0Cf'1Sa.ATED 1R6 SGS-DRAINED-R
Feed and Bleed the RCS RHR2A, Window 1 Feed and Bleed the RCS in RHR2A Window 1 Feed and Bleed Solely Valve the RCS in RHR2A Removed in Window Window 1 1 SV-W1 tT1 N I Foilure lo Dioq_no9e Over Draining Event in Window 1 D-RAWI-XHE FALUR£ Ofl F W FALURE OF FEED AND SPLL 0SING. AND SPLL USING LP! HPI FSW12L FSW12H e A-RAW1-XHE-Fl-5 A-RAW 1-XHE-FH-5
Sof ety Valves Removed W-indow 1 Safely Valve Removed In Window 1 m POS 10 of a POS 6 of a Drained I Refueling Outage Maintenance Outage w P0S-R10 POS-D6 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W1R6 P0S,-R6 PZR-SV-REMOVEDW1
Feed and Bleed the RCS with V foiled RHR2A, Window 1 feed and Bleed the RCS in RHR2A Window 1 failure lo Diagnose O,er Draining Event m in Window 1 ~ D-RAW1-XHE FALURE Of FEED Operator failure FAn.URE OF FEED ANO SPLL USING to use LHSI in . ANO SPILL USING t-PI feed and Spill.
- LPI in Window 1
- FSW12H FSW12L A-RAW1-XHE-FH-10 A-RAW1-XHE-FL-10
Gravity from RWST RHR2A, Window 1 Gravity from RWST in RHR2A Window 1 Safely Valve Removed in Window 1 SV-Wl Failure. to Diagnose Operator Failure INSUF FLOW Over Draining Event lo establish HROUGH LOW HEAD in Window 1 gravity feed INJECTION FLOW rn window 1 PATH D6-CG D-RAW1-XHE A-RAW1-XHE-G-6
Failure of Pressure Recirculation Window 1 H2 ent Exis s PIIA'll'llf D-UW1-DH! 1¥5tt.G
Failure of Recirculation Spray Window 1-couse HPR f oilure F ilure of Recirculation Spray in Window 1 loss of HPSH du to open containmen CON-VFC-RP-COREM Foilure to Oiognose Over Draining Event in Window 1 A-RAW1-XHE-P-4 D-RAW1-XHE ' ALURE OF OUTSOE FALURE OF INSIDE PRAY RECIRCULATION PRAY RECIRClLATION. F2LPSD Fl..PSD
Failure of Pressure Recirculation Window 1 HPR H2 A-U.YI-Dl-0-1 I>-U.YI-DI!
IRAW2 MRAW2 RRAW2 VW2 SRAW2 GRAW2 CRAW2 SEQ # 1 OK 2 OK 3 OK 4 CD 5 CD 6 CD 7 OK 8 OK g CD 10 CD 11 OK 12 CD 13 CD 14 CD 15 OK 16 OK 17 CD 18 CD RAW2R6 Event Tree
UNITY IRAW2 MRAW2 RRAW2 SRAW2 FRAW2V CRAW2V SEQ fl END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD m 6 CD N 0 7 OK 8 OK 9 CD 10 CD RAW2D6 Event Tree
Top Event for Over Draining Window 2 IRA 2Gl PROB-RHR2A m N IRA. 203 POS--Rll FRAC-POSll PR0B-W2R10A PR0D-W2R9A REHO. 00-UT PROll-ll'2D8A POS--06
RCS Makeup Window 2 RCS Makeup in RHR2A in Window 2 Failure to Diagnose Failure to Makeup Over Draining Event Given Over Draining in Window 2 in Window 2 D-RAW2-XHE A-RAW2-XHE-M-12 FAIL HIGH PRES INSUF FLOW FRM FAL HIGH PRES INSUF FLOW FRM FLOW TO CLO LEG- 2 LOW PRES SI FLOW TO HOT LEG- 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS 02 06-C D2HLG LPIHLG
Restore RHR given RHR2A Window 2 Restore RHR Given RHR2A in Window 2 Failure to Restore Failure to Diagnose Loss of RHR RHR, given RHR2A Over Draining Event POSs 3-13 in Window 2 in Window 2 W3-S A-RAW2-XHE-R-4 D-RAW2-XHE
Sof ety ,valves Not Removed 1n W*1ndow 2 Safety Valves Not Removed in Window 2 POS 10 of o OS 6 of o Drained Refueling Outage Maintenance Outage POS-R10 POS-D6 OS 6 of a Refueling Outage P0S-R6 Pressurizer Safety Valves Removed in W2R6 PZR-sy-REMOVEDW2
Reflux Cooling ,n Window 2 RCS Loops lsololed to Couse Foih..re of Reflux Coolin<J 1SO-W2 0-RAW2-XI-£ INSLF FLOW TO SG FRM AT LEAST 1 AFW PUM' LSW23 A-RAW2-XHE-SF -9 FAL TO QOSE FALURE OF SGS BOTH PORVS STEAM PATH TO IN STEAM HEADER SSHW23 *PORV1 SSHW23
, A~W2-Xf£-S1-9 A-RAW2-Xl£-S2-9
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 2 P0S-R10 P0S-R6 POS-06 LOOPJSOLAT!D2RIO LOOPISOLA TED2R8 SGS-CAAKD-R LOOPJSOLATED2DS SGS-0RA1t£D-CS0 SGS-MIIKD-R
Feed and Bleed the RCS RHR2A, Window 2 Feed ond Bleed the RCS in Rl-fl2A Window 2 D-RAW2-XI-E FRA 2GJ 1FtiA 2G4 FALUlE OF FEED At-0 SPU USING LPI FSW12H FSW12L A-RAW2-XI-E-FH-5 A-RAW2-XI-E-FL-5
Sof ety Valves Removed Window 2 Safety Valve Removecf' in Window 2 POS 10 of a POS 6 of o Drained Refueling Outage Maintenance Outage P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W2R6 P0S-R6 PZR-SV-REMOVEDW2
Feed and Bleed the RCS with V foiled RHR2A, Window 2 Feed and Bleed the RCS in RHR2A Window 2 Foilure to Diagnose Over Draining Event in Window 2 D-RAW2-XHE FALURE OF FEED FALURE OF FEED AND SPLL USING AND SPLL USING HPI LP! FSW12H FSW12L A-PAW2-XHE-FH-10 A-RAW2-XHE-FL-10
Gravity from RWST RHR2A, Window 2 Gravity from RWST in Rt-R2A Window 2 Sofety Valve Removed in Window 2 Sv-W2 INS\F FLOW Foilure to Diognose t-ROUGH LOW HEAD Over Draining Event IN.£CTION FLOW in Window 2 PATH D6-CG D'-RAW2-XHE A-RAW2-Xh£-G-6
Failure of Hig.h Pressure Recirculation 1n Window 2
,...,,...Q
Window F oi\ure of Recirculation Spray 1n 2-cause HPR failure F ilure of Recirculation Spray in Window 2 loss of HPSH du to open contoinmen CON-VFC-RP-COREM. Failure ta Diagnose Over Draining Event in Window 2 D-RAW2-XHE A-RAWZ-XHE-P-4 ALURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCQATION PRAY RECIRCULATION F2LPSD F1LPSD
Failure of Hig.h Pressure Recirculation In Window 2
'15lfi R1!f CIAAil fJl U!.f' S\!CT HI J..-uwa-:i:mr-c-a n-u.wa-:um J.l'R **
!lot L"
UNITY IRAW3 MRAW3 RRAW3 VW3 FRAW3 GRAW3 SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD 5 CD 6 OK 7 CD B OK 9 CD 10 CD 11 OK 12 CD RAW3R6 Event Tree
- UNITY I IRAW3 I MRAW3 I RRAW3 I SRAW3 I FRAW3V I SEQ II END-STATE-NAMES 1 OK I I 2 3
OK OK I I I I I 4 5 OK CD I I 6 7 OK OK 8 CD RAW3D6 Event Tree
UNITY IRAW3 MRAW3 RRAW3 VW3 FRAW3 GRAW3 SEQ II END-STATE-NAMES 1 OK z OK 3 OK 4- CD 5 CD 6 OK 7 CD 8 OK 9 CD 10 CD 11 OK 1Z CD RAW3R10 Event Tree
top event for Over Draining 1n window 3 IRA 301 PROB-RHR:U IRA 303 IRA 304 REFLEL P0S-R10 FRAC-POS10 PROB-W3RJOA. P0S-R6 PR0B-W3RflA RtFLEL OR-MT PROB-1f3D6A POS-06
RCS Makeup 1n Window 3 RCS Makeup in RHR2A in Window 3 tr1
- ~
I 00 F oilure to Diagnose Over Draining Event Foilure to Makeup Given Over Draining in Window 3 in Window 3 D-RAW3-XHE A-RAW3-XHE-M-10 FAl HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG- 2 LOW PRES SI FLOW TO CLO LEG- ,2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS D2HLG LPIHLG D2 D6-C
Restore RHR given RHR2A Window 3 Restore RHR Given RHR2A in in Window 3 Foilure to Restore Failure to Diagnose Loss of RHR RHR, given RHR2A Oler Draining 'Event POSs 3-13 in Window 3 in Window 3 W3-S A-RAW3-XHE-R-4 D-RAW3-XHE
Sof ety v,alves Not Removed Window 3 Safety Valves Not Removed in Window 3 OS 6 *of a Drained Maintenance Outage trl . .I,. VW G7 0 POS-D6 of a Refueling POS 10 of a Outage Refueling Outage VW G4 POS-R6 POS-R10 Pressurizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
Reflux Cooling 1n Window 3 G~v*:~*a c~~~ in Window 3 Foilure to Dioq_nose RCS Loops Isolated Over Draining Event to Couse Foilure in Window J of Reflux Cooling SRA 3G1 ISO-W3 D-RAW3-XHE INSL.f FLOW TO SG FR>.4 AT LEAST 1 AFW PUMP LSW23 A-RAW3-XHE-S-8 fAL TO CLOSE BOTH PORVS SSHW23 PORVI SSHW23 A-RAW3-XHE-S1-B A-RAW3-XHE-S2-8
RCS Loops Isolated to Cause Failure of Reflux 1n Window 3 RCS Loops lsoloted to Couse f oilure of Reflux Goofing NO CLCS SIGNAL S 6 of a Refueling OPER OR AUTO Outage TRAIN A ISOW GlO POS-D6 P0S-R10. P0S-R6 SGS-ORAINED-CSD L00PIS0LATED306 L00P1SOLATED3R10 SGS-ORAINE/1)-R LOOPISOLATEDJR6 SGS-DRAINED-R
- Feed and Bleed the RCS
- RHR2A, Window 3 Feed and Bleed the RCS in RHR2A Window 3 Feed and Bleed Safely Vwe the RCS in RHR2A Removed in Window Window 3 3 SV-W3 Fail<Ke ta Diog_nose Over Draining Event in Window 3 D-RAW.3-XHE FALUR£ OF/ F6 D.' FALURE OF FEED ANO SPLL USING . AND SPLL USING LP! HPI FSW34L FSW34H A-RAW.3-XHE-FL-4 A-RAW3-XHE -FH-4
Sof ety Valves Removed 1n W*indow 3 Safety Valve Removed in Window 3 POS 6 of a Drained Maintenance Outage P0S-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6 POS-R6 PZR-SV-REMOVEDW3 POS-RlO PZR-SV-REMOVEDW3
Feed and Bleed the RCS with V failed ,n RHR2A, Window 3 Feed and Bleed the RCS in RHR2A Window 3 Foilure lo Diagnose Over Draining Eve nl in Window 3 -tr1 I
~ 'JI D-RAW3-XHE FALURE OF FEED FALURE OF FEED AND SPILL USING AND SPILL USING HPI LPI FSW34H FSW34L A-RAW3-XHE-FH-8 A-RAW3-XHE-FL-8
Gravity from RWST RHR2A, Window 3 Gravity from RWST in RHR2A in Window 3 Safely Val\le Removed in Window 3 INSUF FLOW Failure. lo Diagnose HROUGH LOW HEAD Over Draining Event INJECTION FLOW in Window 3 PATH 06-CG D-RAW3-XHE A-RAW3-XHE-G-5
UNITY IRAW4 MRAW{ RRAW4 VW4 SRAW4 GRAW4 SEQ II END-STATE-NAMES 1 OK z OK 3 OK 4 OK 5 CD 6 OK 7 OK 8 CD 9 OK 10 OK 11 CD lZ OK 13 OK 14 CD RAW4R6 Event Tree
UNITY IRAW4 MRAW4 RRAW4* VW4 SRAW4 FRAW4 GRAW4 SEQ # END-STA TE-NAMES 1 OK 2 OK 3 OK 4 OK m 5 6 CD OK .I>, 00 7 OK 8 CD 9 OK 10 OK 11 CD 12 OK 13 OK 14 CD RAW4R10 Event Tree
UNITY I IRAW4 I MRAW4 I RRAW4 I SRAW4 I FRAW4V* I *SEQ # END-STATE-NAMES 1 OK I I I 2 3 OK OK I I 4 5 OK CD I I 6 7 OK OK 8 CD RAW4D6 Event Tree
top event for over Draining 1n window 4 IE Frequency Calculation for RAW4 Probability of Over Draining during Mid-Loop t;n . PR0B-RHR2A 'JI 0 Frequency of PCS 'iO of a Probability Probability Refuefing Refueling Outage of POS 10 Given that IE occurs Refueling Outage in W4 given R10 REFUEL P0S-R10 FRAC-POS10 PR0B-W4R10A of o Refue,ng Probability Frequency of Drained Maintonence Probability POS 6 of o Drained Outage that , IE occurs Refueling that IE occurs Maintenance Outage in W4 given R6 in W4 given 06 POS-R6 PR0B-W4R6A REFI..B.. DR-MT PR0B-W4D6A POS-06
RCS Makeup Window 4 RCS Makeup in RHR2A in Window 4 t;r1. '.Jt Failure to Diagnose Failure ta Makeup Over Draining Event Given Over Draining in Window 4 in Window 4 D-RAW4-XHE A-RAW4-XHE-M-11 FAl HIGH PRES INSUF FLOW FRM FAl HIGH PRES INSUF FLOW FRM FLOW TO CLD LEG- 2 LOW PRES SI FLOW TO HOT LEG- 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS D2 D6-C D2HLG LPIHLG
Restore RHR RHR2A Window 4 Restore RHR Given RHR2A in Window 4 m I. V\ N Foilure to Diagnose Loss of Rf-R Foilure to Restore POSs 3-13 RHR, given RHR2A Over Draining Event in Window 4 in Window 4 W3-S A-RAW4-XHE-R-5 D-RAW4-XHE
Sof ety Valves Not Removed ,n Window 4 Safety Valves Not Removed in Window 4 POS 6 of a Draine Maintenance Outage VW G7 VW GO POS-06 POS 6 of a Refuelin POS 10 of o
.Outage Refueling Outage POS-R6 POS-R10 Pressurizer Pressurizer Safety Valves Safety Valves Removed in W4R6 Removed in W4R6
. I .' .. \
PZR-SV-REMOVEDW4 PZR-SV-REMOVEDW4
Reflux Cooling Window 4 Foih.re to Diagnose RCS Loops Isolated er Droinging Event \o Cause Foiure in Window 4 of Reflux Cooling SRA 401 D-RAW4-XHB INSUF FLOW TO SG FRM AT LEAST 1 AFW PUMP LSW4 A-RAW4-XHE-SF-8 Operator Foilure FALURE OF FAL TO QOSE FALURE OF to Bleed the SECOl'OARY SIDE BOTH PORI/S SECONDARY SIC SGs in Window HEAT REMOVAL HEAT REMOVAL 4 SSHH4 SSHW4 A-RA'lf-l-XHB-Sl-8 A-RAW4-XHE-SZ-8
RCS Loops Isolated to Cause Failure of
*Reflux ,n Window 4 RCS Loops lsoloted to Couse failure of Reflux Cooling tT1 I
Vt Vt S 6 of a Refueling Outage
!SOW GX>
POS-D6 POS-RIO P0S-R6 Loops Isolated in or window 4 of R10 LOOPISQATE0406 SGS-DRAINED--CSD SGS-DRAINEO-R LOOPISQATED~R 10 LOOPISOLATED4R6 SGS-DRAINEO-R
Feed and Bleed the RCS RHR2A Window 4 reed and 81eed the RCS In RHl2A Window 4 Sv-W4 D-RAW4-XHE
- A-RAW4-XHE-FL-~ A-RAW4-XHE-FH-~
Sof ety Valves Removed 1n W*i.ndow 4 Safety Valve Removed in Window 4 POS 6 of a Drained Maintenance Outage POS-06 POS 6 of a Refuelin Pressurizer POS 10 of o Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6 P0S-R6 PZR-SV-REMOVEDW4 P0S-R10 PZR-SV-REMOVEDW4
Feed and Bleed the RCS with V failed RHR2B, Window 4 Feed and Bleed the RCS in RHR2B in Window 4 Foilure to Diagnose Over Draining Event in Window 3 D-RAW4--XHE FR<\ 4-VG4-FAILURE OF FEED FAI..URE OF FEED AND SPILL USING AND SPU USING LPI HPI FSW34L FSW34H A-RAW4--XHE-FL-B A-RAW4--XHE-FH-B
Gravity from RWST RHR2A, Window 4 Grovi~ from RWST 1n RHR1A in Window 4 Safety Valve Removed in Window 4 SV-W4 INSUF FLOW Failure to Diagnose THROUGH LOW HEAD Over Draining Event INJECTION FLOW in Window 4 PATH D6-CG
'A-RAW4-XHE-G-5 D-R~W4-XHE
Appendix E.2 Event trees and High Level Fault Trees for Loss of lnventory(RHR2B) E-60
UNITY I lRBWl I MRBW1 I RRBW1 I VW1 I SRBW1. I FRBWl I GRBW1 I CRBWl I. SEQ # END-STA TE I II 1 OK 2 OK 3* OK I 4 CD I 5 CD I 6 CD i I I I 7 8 OK OK 9 CD 10 CD 11 OK I 12 CD I 13 CD I 14 CD I I 15 16 OK OK I 17 CD I 18 CD
. RBW1R6 Event Tree L__
UNITY 1RBW! MRBWl RRBW! FRBWlV CRBWlV SEQ # END-STATE-NAMES l OK 2 OK 3 OK 4 CD m 5 CD I 0\ 6 OK N 7 CD B CD RBW106 Event Tree
Top Event for Loss of Inventory Window 1 fREO--RHl28 DURATION--R!J REFUEL POS--R!O FRAC--POS10 PROO--Wfl!J 6 of o Refualing Outage P0S--R6 PR0B--Wfl6 DU1ATION--R6 RfFLa DR-MT OU1ATION--06 PR08--W1l6 POS--06
RCS Makeup Window 1 RCS Makeup in RHR28, Window 1 m. ~ Failure to Diagnose Foilure to Makeup Loss of Inventory Given Inventory in Window 1 Loss in Window 1 D-RBW1-XHE A-RBW1-XHE-M-12 FAl HIGH PRES INSUF FLOW FRM FAl HIGH PRES INSUF FLOW FRM 2 LOW PRES SI 2 LOW PRES SI FLOW TO CLD LEG-FLOW TO HOT LEG- CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL , P.MPS TO HOT LEGS LEGS D2 D6-C D2HLG LPIHLG
Restore RHR given RHR2B Window 1 Restore RHR Given RHR2B in Window 1 F oilure to Restore Failure to Diagnose Loss of RHR RHR, given RHRB Loss of Inventory P0Ss 3-13 in Window 1 in Window 1 W3-S A-RBW1-XHE-R-4 D-RBW1-XHE
Sof ety Valves ; ' Not Removed Window 1 Safely Valves Not Removed in Window 1 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage tTl I , POS-R10 POS-06* °'°' POS 6 of a Refuelin Outage P0S-R6 Pressurizer Safely Valves Removed in W. 1R6 PZR-SV-REMOVEDW1
Reflux Cooling Window 1 Foilure lo Diagnose RCS Loops Isolated Loss of Inventory to Couse F oilure in Window I of Reflux Cooling ISO-W1 D-RBWI-XHE INSUF FLOW TO Operator Failure SG FRM AT LEAST to Feed SGs in I AFW PUMP Window 1-RHR28 LSW1 A-RBW1-XHE-SF -9 Operator Failure fAL TO CLOSE
- FALURE Of lo Bleed the BOTH PORVS SECONDARY SIDE SGs 1 given RHR28 HEAT REMOVAL SSHW1 PORVI SSHW1 A-RBW1-XHE-Sl-9 A-RBWI-XHE-S2-8
RCS Loops Isolated to Cause Failure of Reflux 1n Window 1 RCS Loops Isolated to Couse f oilure of Reflux Cooing tr1 I , O'I 00 NO CLCS SIGi'W. of o Refueling OPER OR AUTO Outage TRAIN A POS-06 P0S--R10 P0S--R6 Loops Isolated Loops Isolated in of window in window 1 of 1 of Rt> R6 LOOPISOLATEO 106 SGS-DRAINED--CSD SGS-DRAINED-R LOOPIS0LATE01Rtl LOOPISOLATED tR6 SGS-DRAINED-R
Feed and Bleed the RCS 1n RHR2B, Window 1 Feed and Bleed the RCS in RHR28, Window 1 Feed and Bleed Safety Valve the RCS in RHR28 Removed in Window in Window 1 1 SV-Wl Failure to Diagnose Loss of Inventory in Window 1 D-RBW1-XHE FALURE Of FEED f ALURE OF FEED AND SPLL USING .AND SPLL USING LPI HPI FSW12L FSW12H A-RBW1-XHE-FL-5 A-RBWI-XHE-FH-5
Sof ety Valves Removed 1n Window 1 Safety Valve Removed in Window 1 SV W1 mI POS 10 of a POS 6 of a Drained -..] 0 Refueling Outage Maintenance Outage P0S-R10 POS-D6 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W1R6 P0S-R6 PZR-SV-REMOVEDW 1
Feed and Bleed the RCS with V foiled 1n RHR2B, Window 1 Feed and Bleed the RCS in RHR28 in Window 1 Foilure to Diagnose Loss of Inventory in Window 1 D-RBW1-XHE FALURE OF FEED FAILURE OF FEED AND SPLL USING AND SPILL USING HPI LPI FSW12H FSW12L A-RBW1-XHE-FH-10 A-RBW1-XHE-FL-10
Gravity from RWST RHR2B Window 1 Gravity from RWST in RHR2B in Window 1 Safety Valve Removed in Window 1 SV-Wl Failure to Diagnose INSUF FLOW Loss o'f Inventory HROUGH LOW HEAD in Window 1 INJECTION FLOW PATH D6-CG D-RBW1-XHE A-RBW1-XHE-G-6
Failure of Hig~ Pressure Recirculation 1n Window 1 H2 PBBl'IIK D-.RlU?'l-XHB tw.H.Q
F oilure of Recirculation Spray 1n Window '* 1-couse HPR f oilure F ilure of Recirculation Spray in Window 1 loss of HPSH du to open containmen CON-VFC-RP-COREM Failure to Diognase Loss of Inventory in Window 1 A-R8W1-XHE-P-4 0-RElV/ 1-XHE ALURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCLLATION PRAY RECIRCLLATION F2LPSD Fl.PSD
Failure of Pressure Recirculation Window 1 HPR H2 P&Bl'IIII l'Elllt.12 A-D.mn-xHH-c-e D-llllWL-:um w.saa ..........
----r------.--------.--------,-------,-------r------,r--------,-------.-------------~--~
UNITY 1RBW2 MRBW2 RRBW2 vwz SRBW2 FRBW2 GRBWZ CRBW2 SEQ # END-ST TE l OK 2 OK 3 OK 4 CD 5 CD 6 CD 7 OK B OK 9 CD 10 CD 11 OK 12 CD 13 CD 14 CD 15 OK 16 OK 17 CD 18 CD RBW2R6 Event Tree
UNITY 1RBW2 MRBW2 RRBW2 SRBW2 FRBW2V SEQ # END-STATE-NAMES l OK z OK 3 OK 4- OK 5 CD 6 CD 7 OK 8 OK 9 CD lO CD RBW206 Event Tree
Top Event for Loss of Inventory Window 2 fREO--RH12B PbS 10 of o Retuenng Outoge RBW G3 OU1ATION--ll\'.> REflll. P0S--R10 FRAC...POSIO PROB--W2R10 p s P!>S--R6 PROB--W2R6 OU1ATION--R6 REft.n DR-MT D\.RATION---06 PROB--W206 POS---06
RCS Makeup 1n Window 2 RCS Makeup in RHR28, Window 2 lTl I -..J \0 Failure to Diagnose Failure to Makeup Loss of Inventory Given Inventory in Window 2 Loss in Window 2 D-RBW2-XHE A-RBW2-XHE-M-12 FAL HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLOW FRM FLOW TO CLD LEG- 2 LOW PRES SI FLOW TO HOT LEG- 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS
.**. LEGS D2 D6-C D2HLG
- LPIHLG
Restore RHR given RHR2B rn Window 2 Restore RHR Given RHR2B in Window 2 mI 00 0 Failure to Diagnose Loss of RHR Failure to Restore POSs 3-13 RHR, given RHR2B Loss of Inventory in Window 2 in Window 2 W3-S A-RBW2-XHE-R-4 D-RBW2-XHE
Sof ety ,valves Not Removed Window 2 Safety Valves Not Removed in Window 2
. POS 10 of a OS 6 of a Drained Refueling Outage Maintenance Outage tT1 I
00 P0S-R10 POS-06 of a Refueling Outage P0S-R6 Pressurizer Safety Valves Removed in W2R6 PZR-SV-REMOVEDW2
Reflux Cooling Window 2 tTl. I ISO-W2 00 N D-RBW2-Xf£ LSW2J A-RBW2-XHE-SF -9 FAL TO a.OSE FALi.RE OF SGS BOlH PORI/S STEAM PATH TO IN STEAM HEADER
*POR\11 SSH'/123 SSHW23 A-RBW2-Xf£-S2-9 A:-RBW2-Xf£-S1-9
RCS Loops Isolated to Cause Failure of Reflux 1n Window 2 t:r1 00 '.>J NO a.cs SIGl'W.. of a Refueling OPER CR AUTO Outage TRAIN A
!SOW -GIO POS-06 P0S-R10 P0S-R6 Loops Isolated in of Window 2 or RlO LOOPISOLATED2D8 SGS-ORAINED-CSD SGS-DRAINED-R LOOPISOLA TJ!D2R10 LOOPISDLA TED2R6 SGS-DRAINED-R
Feed and Bleed the RCS 1n RHR2B, Window 2 Feed and Bleed the RCS in RHR2B, Window 2 Feed end Bleed Safety Vot,.,e the RCS in RHR2B Removed in Window in Window 2 2 SV-W2 F allure to Diagnose Loss of Inventory in Window 2 FRB 2GO D-RB\112-XHE FALURE OF FEED FALURE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW12H FSW12L A-RBW2-XHE-FH-5
- A-RBW2-XHE-FL-5
Sof ety Valves Removed Window 2 Safety Valve Removed in Window 2 tTl I' 00 SV W2 '.Jt POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W2R6 P0S-R6 PZR-SV-REMOVEDW2
Feed and Bleed the RCS with V foiled 1n RHR2B, Window 2 Feed and Bleed the RCS in RHR28 in Window 2 Failure to Diagnose Loss of Inventory in Window 2 t;ri. 00 0\ D-RBW2-XHE FALURE OF FEED FALURE OF FEED AND SPLL USING ANO SPLL USING HPI LPI FSW12H FSW12L A-RBW2-XHE-FH-1D A-RBW2-XHE-FL-10
Gravity from RWST In RHR2B, Win.dow 2 Gravity from RWST in RHR28 in Window 2 m. I (X) -.J Safety Valve Removed in Window 2 SI/-W2 Operator Failure INSUF FLOW Failure to Diagnose to
- Establish HROUGH LOW HEAD Loss of Inventory Gravity Feed INJECTION FLOW in Window 2 in Window 2 PATH D6-CG A_:RBW2-XHE-G-6 D-RBW2-XHE
Failure of Hi9.h Pressure Recirculation In Window 2 tT1 00 00
Foilure of Recirculot1on Spray 1n Window 2-couse HPR f oilure F ilure of Recirculation Spray in Window 2 loss of HPSH du to open containme tTl I ' 00 \0 CON-VFC-RP-COREM Foilure to Diagnose Loss of Inventory in Window 2 D-RBW2-XHE A-RBW2-XHE-P-4 ALURE OF OLJTSOE FALURE OF INSIDE PRAY RECIRCLLATION PRAY RECIRCULATION F2LPSD FllPSD
Failure of Hi9.h Pressure Recirculation In Window 2 H2 FSWIOH n-:rnma-xe:a .t.-*nwa.-:um-x
- UNITY 1RDW3 MRBW3 RRBW3 VW3 FRBW3 GRBW3 SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD 5 CD 6 OK 7 CD 8 OK 9 CD 10 CD 11 OK 12 CD RBW3R6 Event Tree
UNITY 1RBW3 MRBW3 RRBW3 VW3 FRBW3 GRBW3 SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4' CD 5 CD 6 OK 7 CD 8 OK 9 CD 10 CD 11 OK 12 CD RBW3R10 Event Tree
UNITY IRBW3 MRBW3 RRBW3 SRBW3 FRBW3V END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD 6 OK 7 OK 8 CD RBW3D6 Event Tree
Top Event for Loss of Inventory In Window 3 FREQ-RH12B DURATION-RIO REFLEL POS-R10
- FRAC-POStl PROO-W3R10 P0S-R6 PR00-W;JR6 REFLEL DR-Mr Ot..w.TION-06 PROO-WJ06 POS-06
RCS Makeup ,n Window 3 RCS Makeup in RHR2B, Window 3 Failure to Diagnose Foilure to Makeup Loss of Inventory Given Inventory in Window 3 Loss in Window 3 D-RBW3-XHE A-RBW3-XHE-M-10 FAIL HIGH PRES INSUF FLOW FRM FAR... HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG- 2 LOW PRES SI FLOW TO CLD LEG- 2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS D2HLG LPIHLG D2 D6-C
Restore RHR given RHR2B Window 3 Restore RHR Given RHR2B in Window 3 Failure to Restore Failure to Diagnose Loss of RHR RHR, given RHR28 Loss of Inventory POSs 3-13 in Window 3 in Window 3 W3-S A-RBW3-XHE-R-4 D-RBW3-XHE
Sof ety Not Removed 1n Window 3 Safety Valves Not Removed in Window 3 OS 6 of a Drained Maintenance Outage POS-D6 OS 6 of a Refueling POS 10 of a Outage Refueling Outage VW G4 POS-R6. P0S-R10 Pressurizer Pr.essurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
Reflux Cooling Window 3 Failure to Diagnose RCS Loops Isolated Loss of Inventory to Cause F oilure in Window 3 of Reflux Cooling ISO-W3 D-RBW3-XHE INSLF FLOW TO SG FRM AT LEAST I AFW PUMP LSW23 A-RBV/3-XHE-SF -8 FALURE OF SGS FAL TO O.OSE STEAM PATH TO BOTH PORVS IN STEAM HEADER SSHl'/23 PORV1 SSHl'/23 A-RBW3-XHE-51-8 A-RBW3.:.XHE-S2-8
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 3 NO QCS SIGWJ.. S 6 of a Refueling OPER ffi AUTO Outage TRAIN A
!SOW G10 POS-D6 POS-R\Q P0S-R6 SGS-DRAINED-CSD LOOPISQATED306 L00P1SQATED3R10 SGS-DRAINE~ LOCPISCt.A TED3R6 SGS-DRAINEO-R
Feed and Bleed the RCS RHR2B, Window 3 Feed and Bleed the RCS in RHR2B, Window 3 Feed ond Bleed Safety Vofle the RCS in RHR2B Removed in Window in Window 3 3 FRB 30 SV-W3 Foilure to Diagnose Loss of Inventory in Window 3 8 D-RBW3-XHE FALURE OF FEED FALURE Of FEED AND SPLL USING ANO SPLL USING LPI HPI FSW34L FSW34H A-RBW3-XHE-FL-4 A-RBW3-XHE--FH-4
. Sof ety Valves Removed 1n W*indow 3 Safety Valve Removed in Window 3
POS 6 of a Drained Maintenance Outage POS-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6 P0S-R6 PZR-SV-REMOVEDW3 P0S-R10 PZR-SV-REMOVEDW3
Feed and Bleed the RCS with V foiled In RHR2B, Window 3 Feed and Bleed the RCS in RHR2B in Window 3 Foilure to Diagnose Loss of Inventory in Window 3 tT1 I 0 N D-RBW3-XHE FALURE OF FEED FAILURE OF FEED AND SPH..L USING AND SPILL USING HP! LP! FSW34H FSW34L A-RBW3-XHE-FH-8 A-RBW3-XHE-FL-8
Gravity from RWST 1n RHR2B, Window 3 Gravity from RWST in RHR28 in Window 3 Safety Valve Removed in Window 3 Foilure to Diagnose INSUF FLOW Loss of Inventory HROUGH LOW HEAD in Window 3 INJECTION FLOW PATH b-RBW3-XHE A-RBW3-XHE-G-5
UNITY 1RBW4 MRBW4 RRBW4 VW4 FRBW4 GRBW4 SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD 6 OK 7 CD 8 OK 9 OK 10 CD 11 OK 12 CD RBW4R6 Event Tree
UNITY I 1RBW4 I MRBW4 I RRBW4 I VW4 I FRBW4 I
- GRBW4 I SEQ # END-STATE-NAMES 1 OK 2 OK I 3 OK I I 4 OK t;ri 0
I.Ji I 5 6 7 CD OK CD B OK I I 9 OK 10 CD I 11 OK 12 CD RBW4R10 Event Tree
UNITY 1RDW4 MRBW4 RRBW4 SRBW4 FRBW4V SEQ # END-STA TE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD 6 OK 7 OK 8 CD RBW4D6 Event Tree
Top Event for Loss of Inventory Window 4 FREQ-RH12B DURATION-RIO REFlEL POS-R10 FRAC-POS10 PROB-W4R10 P0S-R6 PROB-W4R6 REFlEL DR-MT OURATION-D6 PROB-W406 POS-06
RCS Makeup Window 4 RCS Makeup in RHR2B, Window 4 tT'l 0 00 Foilure to Diagnose Foilure to Makeup Loss of Inventory Given Inventory in Window 4 Loss in Window 4 D-RBW4-XHE . A-RBW4-XHE-M-11 FAl HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLOW FRM FLOW TO CLD LEG- 2 LOW PRES SI FLOW TO. HOT LEG- 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS D2 D6-C D2HLG LPIHLG
Restore RHR given RHR2B 1n Window 4 Restore RHR Given RHR2B in Window 4 t'I1 I 0 '° Foilure to Restore Foilure to Diagnose Loss of RHR RHR, given RHR2B Loss of Inventory POSs 3-13 in Window 4 in Window 4 W3-S A-RBW4-XHE-R-5 D-RBW4-XHE
Sof ety Valves Not Removed Window 4 Safety Valves Not Removed in Window 4 POS 6 of a Draine Maintenance Outage trl 0 VW G7 POS-06 POS 6 of a Refuelin POS 10 of a
.Outage Refueling Outage VW G4 POS-R6 P0S-R10 Pressurizer Pressurizer Safety Valves Solely Valves Remo~ed in '?/4R6 Removed in W4R6 PZR-SV-REMOVEOW4 PZR-SV-REMOVEDW4
Reflux Cooling Window 4 Fait.re to Diagnose RCS Loops Isolated Loss of Inventory to Couse Foilure in Window 4 of Reflux Cooling ISO-W4 D-RBV/4-XHE INSUF FLOW TO 1 SG FRM AT LEAST 1 AFW PUMP LSW4 s A-RBW4-XHE-SF-B Operator Failure FALURE OF FAL TO QOSE FALURE OF to Bleed the SEC<>>l)ARY SIDE BOTH PORVS SECONDARY SIDE SGs in Window 4 HEAT REMOVAL HEAT REMOVAL SSHW4 SSHW4 A-RBW4-XHE-S1-B
- A-RBW4-XHE-S2-8
RCS Loops Isolated to Cause Failure of Reflux 1n Window 4 tr1 I N NO QCS SIGWIL of a Refueling OPER OR AUTO Outage TRAIN A ISOW GlO POS-06 P0S-R10 PDS-R6 Loops Isolated in of window 4 of RID LOOPISQATED406 SGS-DRAINEO-CSD SGS-DRAINED-R LDOPlsa..ATED4R 10 LDOPISOLATED4R6 SGS-DRAINED-R
- Feed and Bleed the RCS 1n RHR2B, Window 4 Feed and Bleed the RCS in RHR2B, Window 4 Feed and Bleed Safety Valve the RCS in RHR2B Removed in Window in Window 4 4 trJ I*
..... Failure to Diagnose w Loss of Inventory in Window 4 D-RBW4-XHE FALURE OF FEED FAILURE OF FEED AND SPLL USING AND SPILL USING LPI HPI FSW34l FSW34H A-RBW4-XHE-FL-5 A-RBW4-XHE-FH-5
Sof ety Valves Removed W*indow 4 Safety Valve Removed in Window 4 POS 6 of a Drained Maintenance Outage POS-06 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6 P0S-R6 PZR-SV-REMOVEDW4 P0S-R10 PZR-SV-REMOVEDW4
Feed and Blee.d the RCS with V foiled RHR2B, Window 4 Feed and Bleed the RCS in RHR2B in Window 4 Foilure to Diagnose Loss of Inventory in ,Window 4 m I V, D-RBW4-XHE FAILURE OF FEED FAILURE OF FEED AND SPLL USING AND SPILL USING HPI LPI FSW34H FSW34L A-R8W4-XHE-FH-8 A-RBW4-XHE-FL-8
- Gravity from RWST RHR2B, Window 4 Gravity from RWST in RHR2B in Window 4 tTl I
0\ Safety Valve Removed in Window 4 SV-W4 INSUF FLOW Failure to Diagnose THROUGH LOW HEAD Loss of Inventory INJECTION FLOW in Window 4 PATH D6-CG A-RBW4-XHE-G-5 D-RBW4-XHE
Appendix E.3 Event Tree and High Level Fault Trees for Non-recoverable Loss of RHR(RHR3) E-117
UNITY IR3W1 VWl SR3Wl FR3Wl GR3Wl CR3W1 SEQ II END-STATE-NAMES l OK 2 OK
.3 CD 4 CD CD
~ 5 6 OK ..... 7 OK 00 8 CD 9 CD R3W1R6 Event Tree
- UNITY I IR3Wl I FR3W1V I CR3W1V I SEQ #
- END-STATE-NAMES
- I 1 OK 2 OK I 3 CD tTl 4 CD I
R3W1D6 Event Tree I L_______ -
Top Event for Loss of RHR R3 Window 1 FREQ--RHlJ tI1 ~ I
- p s DLRAllON-RIJ REFI.U POS-Rl'.l FRAC-P0Sl'.l PROB-W1RIJ DLRATION-R6 Rffl.CI. P0S-R6 PROB-WR6 DR-Ml !X.RAllJN-06 PR0B-Wtl6 POS-06
Sof ety Valves ; ' Not Removed Window 1 Safely Valves Nol Removed in Window 1 POS 10 of o POS 6 of a Drained Refueling Outage Maintenance Outage t;r1 N POS-RIO POS-06 POS 6 of a Refuelin Outage P0S-R6 Pressurizer Safety Valves Removed in W.1R6 PZR-SV-REMOVEDW1
Reflux Cooling Given RHR3 Window 1 RCS Loops Isolated to Couse Foilvre of Reflux Cooling IS0-W1 D-R3W1-XHE LSWI A-R3W1-XHE-SF-8 Operator Failure FAL TO CLOSE FALUR£ OF to Bleed the BOTH PORVS SECONDARY SIDE SGs 1 given R3 HEAT REMOVAL PORV1 SSHW1 A-R3W1-XH£-S1-8 A-R3WI-XHE-S2-8
RCS Loops Isolated to Couse Foilure of Reflux ,n Window 1 NO QCS SIGl'W. POS 10 of a of a Refueling OPER OR AUTO Refuefing Outage Outage TRAIN A POS-06 POS-RIO P\)S-R6 Loops Isolated in of window 1 of R10 LOOPISCI..ATED '06 SGS-DRAINED-CSO SGS-ORAINED-R LOOPISCI..ATE(? tR 10 LOa>ISIX.ATEO 1R6 SGS-ORAINED-R __ J
Feed and Bleed the RCS RHR3, Window 1 Feed and Bleed the RCS in RHR3, Window 1 Feed and Bleed Safety Valve the RCS in RHR3 Removed in Window in Window 1 1 SV-W1 D-R3W1-XHE FALURE OF FEED FALURE OF FEED AND SPLL USING AND SPLL USING LPI HPI FSW12L FSW12H A-R3W1-XHE-FL-4 A-R3W1-XHE-FH-4
Sof ety Valves Removed 1n Window 1 Safely Valve Removed in Window 1 SV W1 tr1 I ...... POS 10 of a POS 6 of , o
- Drained
~ Refueling Outage Maintenance Outage P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safely Valves Removed in W1R6 P0S-R6 PZR-SV-REMOVEDW1
Feed and Bleed the RCS with V foiled RHR3, Window 1 Feed and Bleed the RCS in RHR3 in Window 1 tT1 I , N 0\ D-R3W1-XHE FR3 1VG2 FR~ 1VG3 FALURE OF FEED FAILURE OF FEED AND SPILL USING AND SPILL USING HPI LPI
-----1 FSW12H FSW12L A-R3W1-XHE-FH-9 A-R3Wl-XHE-FL-9
Gravity from RWST RHR3, Window 1 Gravity from RWST in RHR3 in Window 1 tTJ I * !j Safety Valve Removed in Window 1 SV-W1 INSUF FLOW HROUGH LOW HEAD INJECTION FLOW PATH D6-CG D-R3W1-XHE A-R]W1-XHE-G-5
Failure of Hig~ Pressure Recirculation
,n Window 1 HPR SV-Y1 PR8Wlll A-11aw1-:r.m--0--a li'.SH.C
Failure of Recirculation Spray 1n Window 1-couse HPR f oilure Failure of Recirculation Spray In loss of HPSH du to open contoinme CON-VFC-RP-COREM D-R3W1-XHE A..:.R3W1-XHE-P-3 FALURE OF INSIDE ALURE OF OUTSIDE PRAY RECIRCUATION PRAY RECIRCULATION FllPSD F2LPSD
Failure of Pressure Recirculation Window 1 H2 PB8WIJI 'IEIIJLl2
.L-ll3W1-:XBl1-<l-a t"5H.O
- UNITY I IR3W2 I VW2 I SR3W2 I FR3W2 I GR3W2 I
- CR3W2 I SEQ # END-STATE-NAMES 1 OK 2 OK I 3 CD I 4- CD I 5 CD I I 6
7 01( OK I 8 CD 9 CD R3W2R6 Event Tree
UNITY IR3W2 SR3W2 FR3W2V CR3W2V SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD ....r,n 5 CD w N R3W2D6 Event Tree
Top Event for Loss of RHR- R3 Window 2 tTl w I FREO-RHU w RJW GJ DURATION-R 10 REfUEL P0S-R10 FRAC-POS10 PR08-W2R10 p s OURATION-R6 REFUEL P0S-R6 PROB-W2R6 DR-MT DLRATION-06 PROB-W206 POS-06
Sof ety ,valves Not Removed Window 2 Safety Valves Not Removed in Window 2 POS 10 of a OS 6 of a Drained Refueling Outage Maintenance Outage PDS-R10 POS-06 OS 6 of a Refueling Outage POS-R6 Pressurizer Safety Valves Removed in W2R6 PZR-S\I-REMOVEDW2
Reflux Cooling Given RHR3 1n Window 2 RCS Loops lsoloted to Couse Foilure of Reflux Cooling 1SO-W2 D-R3W2-XHE INSLI" FLOW TO SG FRM AT LEAST 1 AFW PUMP LS11'23 SR3 203 A-R3W2-XHE-SF-8 Operator Foilure FAL TO CLOSE FALURE OF to Bleed the BOTH PORVS SECONDARY SIDE SGs 1 given R3 HEAT REMOVAL SSHW23 PORV1 SSHW23 A-R3W2-XHE-S1-B A-R3W2-XHE-S2-B
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 2 RCS Loops Isolated to Couse failure of Reflux Coofing NO CLCS SIGl>W. POS IO of o S 6 of o Refueling OPER 00 AUTO Refueling Outoge Outage TRAIN A ISOW -GIO POS-D6 POS-RIO P0S-R6 Loops Isolated in of Window 2 of RlO LOOPISOLATED2D6 SGS-DRAINED-CSO SGS-DRA!sEO-R LOOPIS0LATED2R10 LOOPISOLA TED2RO SGS-DRAINEO-R
Feed and Bleed the RCS 1n RHR3, Window Feed and Bleed the RCS in RI-Rl, Window 2 Feed and Bleed Solely Valve the RCS in RHR3 Removed in Window in Window 3 2 D-R3W2-XHE FALURE OF FEED FAILLRE OF FEED AND SPLL USING AND SPILL USING LPI HPI FSW12L FSW12H A-R3W2-XHE-FL-4 A-R3W2-XHE-FH-4
Sof ety Valves Removed Window 2 Safety Valve Removed in Window 2 SV W2 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage POS-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W2R6 POS-R6 PZR-SV-REMOVEDW2
Feed and Bleed the RCS with* V foiled 1n RHR3, Window 2 Feed and Bleed the RCS in RHR3 in Window 2 tTl w I '° D-R3W2-XHE FAILURE OF FEED FAILURE OF FEED AND SPU USING AND SPILL USING HPI LPI FSW12H FSW12L A-R3W2-XHE-FH-9 A-R3W2-XHE-FL-9
Gravity from RWST RHR3, Window 2 Gravity from RWST 1n RHR3 in Window 2 Safety Valve Removed in Window 2 fN-W2 INSUF FLOW HROUGH LOW HEAD INJECTION FLOW PATH D6-CG D-R3W2-XHE A-R3W2-XHE-G-5
Failure of Hi9.h Pressure Recirculation In Window 2 HPR
.A.-11aw:a-um-o-a 0-rowl.-X\£
..,,.._a 1¥.SH.O 1¥5.
Failure of Recirculation Spray 1n Window 2-couse HPR f oilure for RHR3 Event oilure of Recirculotio Spray in Window 2 loss of HPSH d e to open contain CON-VFC-RP-COREM Operolor Foilure FALURE OF FEED to Cross Connect AND SPLL USING ST Given Successf I HPI l*fll FSW12H D:._R3W2-XHE A-R3W2-XHE-P-3 D-R3W2-XHE* A-R3W2-XHE-X FALURE OF OUTSIDE FALURE OF INSIDE SPRAY RECIRCLLATIO SPRAY RECIRCLLATIO F2LPSD
Failure of Hig.h Pressure Recirculation in Window 2 X-Tie RWSTs F'S\1'12H D-11JWZ-Xl£ A-R:lW!-Xf£-X VElffi.12 t"'5ti.Q _ _J
UNITY IR3W3 VW3 FR3W3 GR3W3 SEQ # END-STATE-NAMES l OK 2 OK 3 CD 4- CD 5 OK 6 CD R3W3R6 Event Tree
- ~-
UNITY I IR3W3 I VW3 I FR3W3 I GR3W3 I SEQ # END-STATE-NAMES 1 OK I 2 3 OK CD I I I 4 CD I 5 OK 6 CD R.3W.3R 10 Event Tree
UNITY IR3W3 SR3W3 FR3W3 SEQ H END-STATE-NAMES
- 1 OK 2 OK 3 OK 4 CD R3W3D6 Event Tree
Top Event for Loss of RHR- R3 Window 3 POS-R1J PR00-WJR1J POS-R6 Pfl09-W3R6 OUlATION-R6 Rm.a. OR-1.rT OUlATON--06 PROO-W.l06 POS--06
Sof ety V olves Not Removed 1 Window 3 Safely Valves Nat Removed in Window 3 OS 6 of a Drained Maintenance* Outage VW GO POS-D6 OS 6 of o Refueling POS 10 of a Outage Refueling Outage VW G4 POS-R6* P0S-R10 Pressurizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
Reflux Cooling Given RHR3 Window 3 RCS Loops lsololed to Cause Failure of Reflux Cooling ISO-W3 D-R3W3-XHE Operator Failure to Feed SGs in Window 3 LSW23 A-R3W3-XHE-SF-7 FAL TO CLOSE BOTH PORvS SSHW23 A-RJW3-XHE-S1-7 A-R3W3-XHE-S2-7
RCS Loops Isolated to Couse Failure of Reflux 1n Window 3 NO Cl.CS S\GWJ.. POS 10 of a of a Refueling OPER CR AUTO Refuefing Out.age Outage TRAIN A POS-06 POS-R10 POS-RS SGS-DRAINEO--CSD LOOP1SOLATED306 L00PIS0LATED3R10 SGS-ORAINE!O-R LOOP\SOLATEDJRS SGS-DRAINEO-R
- Feed and Bleed the cs ,n RHR3, Window 3 Feed and Bleed the RCS in RHR3, Window 3 Feed and Bleed Safety Valve the RCS in RHRJ Removed in Window in Window 3 3 SV-WJ Failure to Diagnose Non-recoverable Loss of RHR in Window 3 D-R3W3-XHE FAILLRE OF FEED FALURE OF fE£D AND SPILL USING AN) SP&, li$~ .
I-Pl 1 FSW34H FSW34L A-R3W3-XHE-FH-3 A-R3W3-XHE-FL-3
_Sof ety Valves Removed W*indow 3 Safety Valve Removed in Window 3 tr1 I
- POS 6 of a Drained Vi N Maintenance Outage POS-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6 POS-R6 PZR-SV-REMOVEDW3 P0S-R10 PZR-SV-REMOVEDW3
Feed and Bleed the RCS with V foiled 1n RHR3, Window 3 Feed and Bleed the RCS in RHR3 in Window 3 D-R3W3-XHE FALURE OF FEED Operotor failure FAILURE OF FEED AND SPLL USING at use LHSI in AND SPILL USING HP! Feed and SJ)ill. LP! in Window 3 FSW34H FSW34L A-R3W3-XHE-FH-7 A-R3W3-XHE-FL-7
Gravity from RWST RHR3, Window 3 Gravity from RWST in RHR3 in Window 3 tTl I u, .i,.. Safety Valve Removed in Window 3 INSUF FLOW Failure to Diagnose HROUGH LOW HEAD Non-recoverable INJECTION FLOW Loss of RHR PATH in Window 3 D6-CG D-R3W3-XHE A-R3W3-XHE-G-4
IR3W4 VW4 FR3W4 GR3W4 SEQ II END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD t;r1 V, V, 5 6 OK CD R3W4R6 Event Tree
UNITY IR3W4 VW4 FR3W4 GR3W4 SEQ II END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD 5 OK 6 CD R3W4R 10 Event Tree
- UNITY I IR3W4 I SR3W4 I FR3W4V I GR3W4 I SEQ # END-STA TE-NAMES
- I I 1 OK I I 2 OK 3 OK 4 CD R3W4D6 Event Tree
Top Event for Loss of RHR- R3 Window 4 FREQ-RH>J OlRATKlN-R1l REfln POS-R1l FRAC-POSIO PROB-W4R1l OlRATION-116 REFL{l DIHIT DUlATION-{)6 PRC8-IMD6 POS-OS
Sof ety Valves Removed ,n Window 4 Safety Valves Nol Removed in Window 4 POS 6 of a Draine Maintenance Outage VW G7 VW GO POS-06 POS 6 of a Refuelin POS 10 of a
.outage Refueling Outage P0S-R6 POS-R10 Pressurizer Pressurizer Safely Valves Safely Valves Removed i~ W4R6 Removed in W4R6 l *.**\
PZR-SV-REMOVEDW4 PZR-SV-REMOVEOW4
Reflux Cooling Given RHR3 Window 4 RCS Loops Isolated to Couse failure of Reflux Cooling SR3 4G1 ISO-W4 D-R3W4-XHE INSLF FLOW TO SG FRM AT LEAST 1 AFW PUMP LSW4 SR3 4G4 A-R3W4-XHE-SF-7 FALURE OF FALTO QOSE FALURE OF SECOWARY SIDE BOTH PORVS SECONDARY SIDE HEAT REMOVAL HEAT REMOVAL PORV1 SSKW4 A-R3W4-XHE-S1-7 A-R3W4-XHE-S2-7
RCS Loops Isolated to Couse F oilure of Reflux 1n Window 4 NO QCS SIGWIL POS 10 of o of o Refueling OPER OR AUTO Refuering Outoge Outage TRAIN A ISOW G'O POS-D6 P0S--R10 . P0S--R6 Loops Isolated in of window 4 of RlO LOOPISQATED406 SGS'....ORAINED-{;S0 SGS-DRAINED-R LOOPISQATED4R 10 LOOPISa.ATE04R6 SGS-DRAINEO-R
Feed and Bleed the RCS RHR3, Window 4 Feed and Bleed the RCS in RHR3, Window 4 Feed and Bleed Safety Valve the RCS in RHR3 Removed in Window in Window 4 4 D-R3W4-XHE FALURE OF FEED FAILURE OF FEED AND SPLL USING AND SPlL USING HPI LPI FSW34H FSW34L A-R3W4-XHE-FH-4 A-R3W4-XHE-FL-4
Sof ety Valves Removed W-indow 4 Safety Valve Removed in Window 4 POS 6 of a Drained Maintenance Outage POS-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outoge Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6 POS-R6 PZR-SV-REMOVEDW4 POS-R19 PZR-SV-REMOVEDW4
Feed and Bleed the RCS with V foiled RHR3, Window 4 Feed and Bleed the RCS in RHR3 in Window 4 D-R3W4-XHE FR3W VG3 FALURE OF FEED FALURE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34H FSW34L A-R3W4-XHE-FH-7 A-R3W4-XHE-FL-7
Gravity from RWST RHR3, Window 4 Gravity from RWST 1n RHR3 in Window 4 Safety Valve Removed in Window 4 9/-W4 INSUF FLOW Failure to Diagnose Operator Failure HROUGH LOW HEAD Non-recoveroble to establish INJECTION FLOW Loss of RHR gravity feed PATH in Window 4 1n window 4 D6-CG D-R3W4-XHE A-R(3W4-XHE-G-4
Appendix E.4 Event Trees and High Level Fault Trees for Loss of Operation Train o RHR(RHR4) E--166
UNITY I IR4-W1 I RR4-W1 I VWl I SR4-W1 I FR4-W1 I GR4-W1 I CR4-W1 I SEQ H
- END-STATE-NAMES I
1 OK f 2 OK I I 3 4-OK CD I I 5 6 CD CD I I 7 8 OK OK I 9 CD I 10 CD R4W1R6 Event Tree
UNITY IR4Wl RR4Wl FR4WlV CR4W!V SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD m 5 CD I ~ R4W106 Event Tree
top event for loss of RHR- R4 Window .1 IXJRATION-Rll REfUU POS-Rll FRAC--l'OS10 PROO-WlllO PQS-1l6 PR08-WR6 RfFlil DR-MT DUlATION--06 PROB-W06 POS--06
Restore RHR given RHR4 1n Window 1 Restore RHR Given RHR4 in Window 1 Foilure to Restore Loss of RI-R-4 RHR, given RHR4 POSs 3-13 in Window 1 W3-S A-R4W1-XHE-R-4 D-R4W1-XHE
- Sof ety Valves Not Removed
- Window 1 Safety Valves Not Removed in Window 1 POS 10 af o POS 6 of a Drained Refueling Outage Maintenance Outage POS-R10 POS-D6 POS 6 of a Refuelin Outage POS-R6 Pressurizer Safety Valves Removed in W1R6 PZR-SV-REMOVEDWl
Reflux Cooling Window 1 tT1 I -:i N D-R41f1-XHE LSW1 SR4 103 A-R5W1-XHE-SF-9 FAL TO 0.0SE FALURE OF BOTH PORVS SECONDARY SIDE 1£AT REMOVAL SSHW1
. A,-R41f1-XBB-S1-9 A-R4W1-XHE-S2-9
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 1 RCS Loops Isolated to Couse r oilure of Reflux Cooing NO QCS SIGNAL POS 10 of a S 6 of a Refueling OPER OR AUTO Refue,ng Out~ge Outoge TRAIN A POS-06 POS-RIO P0S-R6 LOOPISQATED 06 SGS-DRAINED--CSD SGS-OOAINED-R LOOPlsa.ATEC11R 10 LOOPIS0LATED1R6 SGS-OOAINED-R
Feed and Bleed the RCS RHR4, Window 1 Feed and Bleed the RCS in RHR4, Window 1 Feed and Bleed Safely VoNe lhe RCS in RHR4, Removed in Window Window 1 1 sv-w, m I * -...J .p. D-R4Wl-XHB FR4 104 FALURE OF FEED ANO SPLL USING HP! FSW12H A-Rt1fl-XHE-FL-~ A-R4Wl-XHE-FH-(I
Sof ety Valves Removed Window 1 Safety Valve Removed In Wlp.dow 1 SV W1 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-D6 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W1R6 P0S:-R6 PZR-SV-REMOVEDW1
Feed and Bleed the RCS with V foiled RHR4, Window 1 Feed and Bleed the RCS in RHR4, Window 1 [Tl I '1 0\ D-R4W1-XHE FR4 1VG2 FAlURE OF FEED FAILURE OF FEED AND SPLL USING AND SPlL .USING HP! LP! FSW12H FSW12L A-R4W1-XHB-PH-10 A-R4W1-XHB-PL-10
Gravity from RWST RHR4, Window 1 Gravity from RWST in RHR4, Window 1 tT1 I
- I Safety Valve Removed in Window 1
SV-W1 INSUF now THROUGH LOW HEAD INJECTION FLOW PATH 06-CG D-R4W1-XHE A-R4W1-XHE-G-6
Failure of Hig~ Pressure Recirculation 1n Window 1 HPR SV-lfl H2 PBl1fH D-li'Wl-Xlill!
Failure of Recirculation Spray Window 1-couse HPR f oilure F ilure of Recirculation Spray in Window 1 loss of HPSH du to open contoinmen tT1 I * -.J \C) CON-VFC-RP-COREM 0 A-R4W1-XHE-P-4 D-R4W1-XHE ALURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCLI..ATION.
,,..\
F2LPSD Fl..PSD
Failure of Hig~ Pressure Recirculation In Window 1 H2 CM lYC~ VEll!l.\2
.1.-11,111-xim-c-a o-uw,-:um
UNITY I IR4W2 I RR4W2 I VW2 I SR4W2 I FR4W2 I GR4W2 I CR4W2 I SEQ # END-STATE-NAMES l OK I 2 OK I I 3 4 OK CD t;r1 00 I I I I I 5 6 7 8 9 CD CD OK OK CD 10 CD R4W2R6 Event Tree
UNITY IR4W2 RR4W2 SR4W2 FR4W2V CR4W2V SEQ # END-STA TE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD 6 CD R4W2D6 Event Tree
Top Event for Loss of RHR- R4 1n Window 2 FREQ-AHR4 01.RATON-Rl() REflR. POS-Rl() FRAC-POS1Cl PROO-W2Rll p Probdllllty that E OCCtr9 in W2 <jven 06 POS-R6 PROO-W2R6 DlllATION-R6 REFUEL OR-MT ornATION-06 PROB-W206 POS-06
Restore RHR given RHR4 1n Window 2 Restore RHR Given RHR4 in Window 2 trl ~ I , Failure to Restore R~, given RHR4 in Window 2 Loss of RHR POSs 3-13 W3-S A-R4W2-XHE-R-4 D-R4W2-XHE
Safety ,valves Not Removed Window 2 Safely Valves Nol Removed in Window 2 POS 10 of a OS 6 of a Drained
- Refueling Outage Maintenance Outage t;r1 00 Vt P0S-R10 POS-06 OS 6 of a Refueling Outage POS-R6 Pressurizer Safety Valves Removed in W2R6 PZR-SV-REMOVEOW2
Reflux Cooling 1n Window 2 RCS Loops Isolated lo Couse Failure of Reflux Cooling SR4 201 ISO-W2 D-R4W2-XHE INSUF FLOW TO Operator Foilure SG FRM AT LEAST to Feed SGs in 1 AFW PUMP Window 2-R5 LSW23 SR4 2G4 A-R4W2-XHE-SF-9 FAL TO CLOSE BOTH PORVS SSHW23 A-R4W2-XHE-S1-9 A-R'1'12-XHE-S2-9
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 2 tr1 I 00 -..l NO a.cs SIGNA.L POS 10 of a of a Refueling OPER OR AUTO Refuefing Ou\age Outage TRAIN A
!SOW -010 POS-06 P0S-R10 PPS-R6 Loops Isolated in of Window 2 of R10 LOOPIS0LA.TED2D6 SGS-DRAINED-CSD SGS-DRAINED-R LOOPISOLA. TJlD2R 10 LOOPISOLA. TED2R6 SGS-DRAINED-R
Feed and Bleed the RCS RHR4, Window 2 Feed and Bleed the RCS in RHR4, Window 2 Feed and Bleed Safety Vowe the RCS in RHR4, Removed in Window Window 2 2 ....00tTl . I 00 D-R4W2-XHI': FALURE OF FEED FAILURE OF FEED ANO SPLL USING ANO SPLL USING HPI LP! FSW12H FSW12L
Sof ety Valves Removed Window 2 Safety Valve Removed in Window 2 ....m I 00 SV W2 \0 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-D6 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W2R6 P0S-R6 PZR-SV-REMOVEDW2
Feed and Bleed the RCS with V foiled ,n RHR4, Window 2 Feed and Bleed the RCS in RHR4, Window 2 D-R4W2-XHE FALURE OF FEED FAILURE OF FEED AM) SPLL USING AND SPLL USING HPI LPI FSW12H. FSW12L A-R4W2-XHE-FH-10 A-R4W2-XHE-FL-10
Gravity from RWST 1n RHR4, Window 2 Gravity from RWST in RHR4 Window 2 trl I
\ C)
Safety Valve Removed in Window 2 INSUF FLOW HROUGH LOW HEAD INJECTION FLOW PATH D6-CG D-R4WZ-XHE A-R4WZ-XHE-G-6
Failure of Hi9.h Pressure Recirculation In Window 2 HPR twiH.Q
Failure of Recirculation Spray 1n Window 2-cause HPR failure ailure of Recirculatio Spray in Window 2 loss of HPSH d ta open containme t PR4 2Gl CON-VFC-RP-COREM FALURE OF FEED Al-0 SPLL USING HPI FSW12H A-R4W2-XHE-P-4 D-R4W2-XHB D-R4W2-XHE A-R4W2-XHE-X F2LPSD Ft.PSD
Failure of Hi9.h Pressure Recirculation In Window 2 HPR PMWQ HI PMWB D-HW2-Xllll
UNITY I IR4W3 I RR4W3 I VW3 I FR4W3 I GR4W3 I SEQ II END-STA TE-NAMES 1 OK I 2 OK I I 3 OK 4 I I 5 CD CD I 6 OK 7 CD R4W3R6 Event Tree
UNITY IR4W3 RR4W3 VW3 FR4W3 GR4W3 SEQ # END-STATE-NAMES l OK 2 OK 3 OK 4 CD 5 CD 6 OK 7 CD R4W3R10 Event Tree
NITY IR4W3 RR4W3 SR4W3 FR4W3V SEQ II END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD R4W306 Event Tree
top event for loss of RHR-4 window 3 PRBQ-RHH OURATKJN-R1J REFUEl POS-R10 FRAC-POS10 PROB-W.lR 1) POS-R6 PROB-W.lR6 0UlATION-R6 OR-MT OLRATON-06 PROB-W.306 POS-06
Restore RHR given RHR4 Window 3 Restore RHR Given RHR4 in window 3 tr1 \0 I \0 Failure to Restore Loss of RHR-4 RHR, given RHR4 POSs 3-13 in Window 3 W3-S A-R4W3-XHE-R-4 D-R4W3-XHE
Sof ety v,alves Not Removed 1n Window 3 Safely Valves Not Removed in Window 3 OS 6 of *a Drained Maintenance Outage
- VW G7 VW GO POS-06 OS 6 of a Refueling POS 10 of a Outage Refueling Outage VW G4 P0S-R6 POS-R10 Pressurizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
Reflux Cooling
- Window 3 RCS Loops Isolated to Cause f oilure of Reflux Cooling SR4 301 ISO-W3 D-R4W3-XHE Operator f oilure to feed SGs in Window 3 SR4 3G3 SR4 304 A-R4W3-XHE-SP-8 fAL TO QOSE BOTH PORVS 5SHW23 PORVI SSHW23 A-R-1,W3-XHE-S1-8 A-R4W3-XHE-S2-8
RCS Loops Isolated to Cause Failure of Reflux 1n Window 3 NO a.cs SIGNo\L POS 10 of a S 6 or a Refueling OPER DR AUTO Refueling Outage Outage TRAIN A POS-06 P0S-R10
- P0S-R6 SGS-DRAINED-CSD LODP1Sa.ATED3D6 L00P1Sa.ATED3R 10 SGS-DRAINED-R LOOP1Sa.ATEDJR6 SGS-DRAINED-R
Feed and. Bleed RHRS, Window 3
- Feed ond Bleed the RCS in R~5.
Window J Feed and Bleed Safety VONe the RCS in RHR5, Removed in Window Window J J tT1 I N 0 w D-R4W3-XHE FA/1..LRE OF FEED FALURE OF EEED AND SPILL USING AN) SPt~I /..!§~ ., I-Pl FSW34H FSWJ4L A-R4W3-XHB-FH-4 A-R4W3-XHE-FL-4
Sof ety Valves Removed W*indow 3 Safety Valve Removed in Window 3 mI N* POS 6 of a Drained 0 ~ Maintenance Outage P0S-D6 POS 6 of a Refuelin Pressurizer PCS 10 of a Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6 POS-R6 PZR-SV-REMOVEDW3 P0S-R10 PZR-SV-REMOVEDW3
- Feed and Bleed the RCS with V foiled RHR4, Window 3 Feed and Bleed the RCS in RHR4, Window 3 D-R4W3-XHE FALURE OF FEED FAILURE OF FEED AND SPLL USING AND SPLL USING HPI LP/
FSW34H FSW34L A-R4W3-XHE-PH-8 A-R4W3-XHE-PL-8
Gravity from RWST RHR4, Window 3 Gravity from RWST 1n RHR4, Window 3 Sofety Valve Removed in Window 3 SV-W3 INSIIIF FLOW HROUGH LOW HEAD INJECTION FLOW PATH 06-CG D-R4-W3-XHE A-R4W3-XHE-G-5
UNITY I IR4W4 I RR4W4 I VW4 I FR4W4 I GR4W4. I SEQ # END-STATE-NAMES I I I I 1 OK I 2 OK I I 3 OK I I I 4 OK 5 CD I 6 OK 7 CD R4W4R6 Event Tree
UNITY IR4W4 RR4W4 VW4 FR4W4 GR4W4 SEQ /I END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK t;1'I 5 CD N 6 OK 0 7 CD 00 R4W4R10 Event Tree
UNITY I IR4W4 I RR4W4 I SR4W4 I FR4W4V I SEQ #* END-STATE-NAMES I 1 OK I I z OK I 3 OK 4 OK 5 CD I R4W4D6 Event Tree I
top event for loss of RHR-4 1n window 4 PRIQ-RHR* lTl N' 0 OLRATION-Rtl R(fl£l POS-Rtl FRAC-POS10 PROB-W4Rtl OlRATION-R6 REf\,{l_ '*POS-R6 PROB-W4R6 DR-MT OUlATION-D6 PROB-W4D6 POS-06
Restore RHR given RHR4 1n Window 4 Restore RHR Given RHR4
- in Window 4 tr1' I
- N F oilure to Restore Loss of RHR RHR, given RHR4 P0Ss 3-13 in Window 4 W3-S A-R4W4-XHE-R-5 D-R4W4-XHE
Safety Valves Not Removed Window 4 Safely Valves Nol Removed in Window 4 POS 6 of o Draine Maintenance Outage tTl I* N N POS-06 POS 6 of a Refuelin POS 10 of a
. Outage Refueling Outage POS-R6 P0S-R10 Pressurizer Pressurizer Safely Valves Solely Valves Removed i" W4,R6 Removed in W4R6 PZR-SV-REMOVEDW4 PZR-SV-REMOVEDW4
Reflux Cooling 1n Window 4 RCS Loops Isolated lo Couse Foilvre of Reflux Cooling ISO-W4 D-R41H-XHB INSL.F FLOW TO SG FRM AT LEAST 1 AFW PUMP LSW4 SR4 403 SR4 404 A-R4W4-XHB-SF-8 Operator Foilure FALUlE OF FALTO QOSE FALURE OF to Bleed the SECO!-OARY SIDE BOTH PORVS SECONDARY SIC SGs in Window HEAT REMOVAL HEAT REMOVAL 4 SSHW4 PORVI SSHW4 A-R4W4-XH1!-S1-8 A-R4W4-XHE-S2-8
RCS Loops Isolated to Couse F oilure of Reflux 1n Window 4 NO QCS SIGN/IL of a Refueling OPER OR AUTO Outage TRAIN A
!SOW G10 POS-06 POS-RIO. POS-R6 Loops Isolated Loops Isolated in window 4 of in of window 06 4 of R10 LOOPISO..ATED4D6 SGS-DRAINED-CSD SGS-DRAl'IED-R LOOPISCI.J\TEd4R 10 LOOPISOLATED4R6 SGS-DRAINED-R
Feed and Bleed the RHR4, Window 4 Feed and Bleed the RCS in RHR4, Window 4 Feed and Bleed Safety Valve the RCS in RHR4, Removed in Window Window. 4 4 D-R4W4-XHE Operator Failure FALURE OF FEED FAILURE OF FEED to use HHSI in AND SPLL USING AND SPILL USING feed and spill HPI LPI in Window 4 FSW34H FSW34L A-R4W4-XHE-FH-~ A-R4W4-XHE-FL-~
Sof ety Valves Removed W*1ndow 4 Safety Valve Removed in Window 4 POS 6 of o Droined Maintenance Outage POS-06 Pressurizer POS 10 of a Pressurizer POS 6 of a Refuelin Safety Valves Outage Safety Valves Refueling Outage Removed in W4R6 Removed in W4R6 PZR-SV-REMOVEDW4 P0S-R10 PZR-SV-REMOVEDW4 POS-R6
Feed and Bleed the RCS with V foiled RHR4, Window 4 Feed and Bleed the RCS in RHR4, Window 4 FR4W VG! D-R4W4-XHE FR4-W VGZ FR4-W VG3 FALURE OF FEED FALURE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34H FSW34L A-R4-W4-XHE-FH-8 A-R4-W 4- -XHE-FL-8
Gravity from RWST 1n RHR4, Window 4 Gravity from RWST in RHR4, Window 4 [Tj N 00 Safety Valve Removed in Window 4 INSUF FLOW HROUGH LOW HEAD INJECTION FLOW PATH 06-CG D-R4W4-XHE A-R4W4-XHE-G-~
Appendix E.5 Event Trees and High Level Fault Trees for Recoverable Loss of RHR (RHR5)
UNITY IR5W! RR5Wl VWI SR5Wl FR5W! GR5Wl CR5W! SEQ # END-STA TE-NAMES I OK 2 OK 3 OK 4 CD 5 CD 6 CD 7 OK 8 OK 9 CD 10 CD RSW 1R6 Event Tree ~----------- ----
UNITY I !R~W I I RR5WJ I FR5W1 I GR5W! I CR~Wl I SEQ # END-STATE-NAMES I i I 1 OK ! 2 OK I I 3 OK I I 4 CD 5 CD R5W1D6 Event Tree I l.
top event for loss of RHR- R5 ,n Window 1 FREQ-RHRS m ~ N p s OURATKlN-RO REFUEL POS-R10 FRAC-POS10 PRC6-W110 POS-R6 PROB-W116 0UlATION-R6 REFlB. DR-MT DIJlATKJN-06 PR08-W06 POS-06
Restore RHR given RHRS 1n Window 1 Restore RHR Given RHR5 in Window 1 m ~- Foilure to Restore Failure to Diagnose Loss of RHR RHR, given RHR5 Recoveroole Loss of P0Ss 3-13 in Window 1 RHR in Window 1 W3-S A-R5W1-XHE-R-4 D-R5W1-XHE
Sof ety Valves Not Removed Window 1 Safely Valves Nat Removed in Window 1 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage POS-RlO POS-06 POS 6 of a Refuelin Outage P0S-R6 Pressurizer Safety Valves Removed in W1R6 PZR-SV-REMOVEDWl
Reflux Cooling Given RHR5 Window 1 IS0-W1 D-R5W1-XHE A-R5W 1-XHE-SF -9 FALURE Cl' FALURE Cl' SECONDARY SIDE SECONDARY SOE HEAT REMCNAL 1-t:AT REMOVAL SSHW1 . POR\11 SSHW1
,4-R5W1-XHE-S1-9 A-R5W 1-XHE -S2-9
RCS Loops Isolated to Cause Failure of Reflux 1n Window 1 RCS Loops lsoloted to Couse f oilure of Reflux Cooing mI N N °' NO CLCS SIGI-W. S 6 of a Refueling OPER al AlfTO Outoge TRAIN A POS-06 P0S-R10 POS-R6 Loops Isolated Loo~s Isolated in of window in window 1 of 1 of Rn R6 LOOPISQATED 06 SGS-DRAINEO-CSD SGS-OOAINED-R LOOPISQATEcltRn LOOP1SClATEDtR6 SGS-OOAINED-R
Feed and Bleed the RCS 1n RHRS, Window 1 Feed and Bleed Safety Valve the RCS in RHR5 Removed in Window in Window 1 1 Sv-W1 Foilu-e to Diagnose Recoverable Loss of RHR in Window 1 D-RSWI-XHE FAL URE OF FEED AND SPLL USING LPI FSW12L A-R5W1-XHE-FL-5 A-R5W1-XHE-FH-5
Sof ety Valves Removed Window 1 Safely Valve Removed In Window 1 SV W1 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safely Valves Removed in W1R6 P0S-;-R6 PZR-SV-REMOVEDW1
Feed and Bleed the RCS with V foiled ,n RHRS, Window 1 Feed and Bleed the RCS in RHRS in Window 1 Failure to Diagnose Recoverable Loss of RHR in Window 1 D-RSWl-XHE FAlURE OF FEED Operator failure FAILURE OF FEED AND SPLL USING at use lHSI in AND SPll USING HPI Feed opd-., Spill LPI in Wi ' 1 FSW12H FSW12L A-RSWl-XHE-FH-10 A-RSWl-XHE-FL-10
Gravity from RWST 1n RHRS, Window 1 Gravity from RWST in RHR5 in Window 1 Safety Volve Removed in Window 1 SV-W1 Foilure to Diagnose INSUF 'FLOW Recoverable Loss of THROUGH LOW HEAD RHR in Window 1 INJECTION FLOW PATH 06-CG D-R5W1-XHE A-R5W1-XHE-G-6
Failure of Pressure Recirculation Window 1 HPR SV'-\fl H2 PB~lfllf *,rnn.12 1"5H.Q
F oilure of Recirculation Spray 1*n Window 1-couse HPR f oilure for RHRS Event F ilure of Recirculation Spray in Window 1 loss of HPSH du to open contoinmen CON-VFC-RP-COREM Foilure to Diagnose Recoverable Loss of R~ in Window 1 A-R5W1-XHE-P-4
- D-R5W1-XHE ALURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCLLATION PRAY RECIRCULATK?N
- F2LPSD Ft.PSD
Failure of Hig~ Pressure Recirculation 1n Window 1 HPR H2
.l-IUIWL-:UZ::K~-4 tl'.SH.Q tl'.S,
UNITY IR5W2 RR5W2 VW2 SR5W2 FR5W2 GR5W2 CR5W2 SEQ # END-STATE-NAMES l OK 2 OK 3 OK 4 CD 5 CD 6 CD 7 OK 8 OK 9 CD 10 CD R5W2R6 Event Tree
UNITY I IR5W2 I RR5W2 I SR5W2 I FR5W2V I CR5W2V
- I SEQ # END-STA TE-NAMES
- I 1 OK 2 OK I I 3 I I OK I
4 OK I 5 m CD 6 ~ CD V, R5W2D6 Event Tree
Top Event for Loss of RHR- RS Window 2 R5W 02 FR£0-RHl5 IR5W G3 R5W C4 01.RATIJN-RIO Rfflfl POS-RIO FRAC-POSIO PROO-W2RIO P0S-R6 PROO-W2R6 DI.RATION-R6 REFUEi. DR-MT DI.RATION-06 PROB-W206 POS-06
*Restore RHR given RHRS 1n Window 2 Restore RHR Given RHR5 in Window 2 mI
- N t,.)
-...l Foilure to Restore Failure to Diagnose Loss of RHR RHR, given RHR5 Recoverable Loss of P0Ss 3-13 in Window 2 RHR in Window 2 W3-S A-R5W2-XHE-R-4 D-R5W2-XHE
Sof ety Valves Not Removed 1n Window 2 Safely Valves Not Removed in Window 2 POS 10 of a OS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-06 OS 6 of a Refueling Outage P0S-R6 Pressurizer Safety Valves Removed in W2R6 PZR-SV-REMOVEDW2
Reflux Cooling Given RHRS Window 2 Foilure to Diagnose RCS Loops Isolated Recovercble Loss of lo Couse Foilure RHR in Window 2 of Reflux Cooling ISO-W2 D-R5W2-XHE INSUF FLOW TO Operator Foilure SG FRM AT LEAST to Feed SGs in 1 AFW PUMP Window 2-R5 LSW23 A-R5W2-XHE-SF-9 FALURE OF SGS FALTO QOSE STEAM PATH TO BOTH PORVS IN STEAM I-EADER 5SHW23 PORV1 SSHW23 A-R5W2-XHE-S1-9 A-R5W2-XHE-S2-9
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 2 NO Cl.CS SIGWIL S 6 of a Refueling OPER OR AUTO Outage TRAIN A ISO 202 !SOW -010 POS-06 P0S-R10 P0S-R6 Loops lsoloted in of Window 2 of R10 LOOP ISOLA TED2D6 SGS-DRAINEO--CSD SGS-CAAINED-R LOOPISOLA Tlj02R10 LOOP1SOI..ATED2R6 SGS-CAAINEO-R
- Feed and Bleed the RCS 1n RHRS, Window 2 Feed and Bleed the RCS in RHR5, Window 2 Feed and Bleed Safety Valve the RCS in RHR5 Removed in Window in Wirdow 2 2 Failure to Diagnose Recoverable Loss of RHR in Window 2 D-R5W2-XHE FR5 2G2 FALURE OF FEl:O' FALURE OF FEt '
AND SPLL USING AND SPLL USING HPI LPI FSW12H FSW12L A-R5W2-XHE-FH-5 A-R5W2-XHE-FL-5
Sof ety Valves Removed Window 2 Safety Valve Removed in Window 2 SV W2 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage POS-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W2R6 P0S-R6 PZR-SV-REMOVEDW2
Feed and Bleed the RCS with V foiled RHRS, Window 2 Feed and Bleed the RCS in RHRS in Window 2 Foilure to Diagnose Recoverable Loss of RHR in Window 2 D-RSW2-XHE FALURE OF FEED FAM..URE OF FEED AND SPlL USING AND SPILL USING HP! LP! FSW12H FSW12L A-RSW2-XHE-FH-10 A-RSW2-XHE-Fl-10
Gravity from RWST 1n RHRS, Window 2 Gravity from RWST 1n RHR5 in Window 2 Sofely Valve Removed in Window 2 SV-W2 Failure .to Diagnose Operator Failure INSUF Flow* Recoverable Loss of lo Establish HROUGH LOW HEAD RHR in Window 2 Gravity Feed INJECTION FLOW in Window 2 PATH L:_ 06-CG 0 D-R5W2-XHE A-R5W2-XHE-G-6
- Failure of Recirculation Spray 1n Window 2-cause HPR failure for R*HRS Event ailure of Recirculolio Spray in Window 2
loss of HPSH d lo open contoinme t CON-VFC-RP-COREM Foilure to Diagnose Failure to Diognose FALURE OF FEED Recoverable Loss of Recovercble Loss of Al-0 SPLL USING RHR in Window 2 RHR in Window 2 HPI FSW12H A-R5W2-Xl-£-P-4 D-R5W2-XHE D-R5W2-XHE A-R5W2-XHE-X F2LPSD Fl..PSD
Failure of Hi9.h Pressure Recirculation in Window 2 H2
.l-1111wa-xm,...c-a D-a&Wa-Xe:B 11'.SH.O
Failure of Hi9.h Pressure Recirculation
,n Window 2 HPR H2
.A..-85Wa-Xlll!-C-L n-~wa-:re:e
UNITY IR5W3 RR5W3 VW3 FR5W3 GR5W3 SEQ # END-STATE-NAMES 1 OK z OK 3 OK 4 CD m 5 CD ~ 00 6 7 OK CD R5W3R6 Event Tree
UNITY IR5W3 RR5W3 VW3 FR5W3 GR5W3* END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD 5 CD 6 OK 7 CD R5W3R10 Event Tree
UNITY IR5W3 RR5W3 SR5W3 FR5W3V SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4- OK tT1 5 CD r!.J 'JI 0 R5W.3D6 Event Tree
Top Event for Loss of RHR- RS 1n Window 3 FREQ-RHRO p Dl.11ATION-R Kl POS-Rn. FRAC-POSU PROB-W3Rn POS-R~ PROO-W3R6 DLAATKJN-R6 REF\E. DR-MT Dl.11ATION-D6 PR00-W3D6 POS-06
Restore RHR given RHRS Window 3 Restore RHR Given Rt-R5 in Window 3 m N. V, N Foilure to Restore Foilure to Diagnose Loss of RHR-5 RHR, given RHR5 Recoverable Loss of POSs 3-13 in Window 3 RHR in Window 3 W3-S A-ROW3-XHE-R-4 D-ROW3-XHE
Sof ety Valves Not Removed Window 3 Safety Valves Not Removed in Window 3 OS 6 of a Drained Maintenance Outage VW GO POS-06 OS 6 of a Refueling POS 10 of a Outage Refueling Outage POS-R6 P0S-R10 Pressurizer Pressurizer Safety Valves Safely Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
Reflux Cooling Given RHRS Window 3
~i~~~*/~~g in Window 3 Foilure to Diagnose RCS Loops Isolated Recovercble Loss of to Cause Failure RHR In Window 3 or Reflux Cooling ISO-W3 D-R5W3-XHE LSW23 A-R51f3-XHE-SF-B FALURE OF SGS FAL TO CLOSE STEAM PATH TO BOTH PORVS IN STEAM 1-£ADER SSHW23 PORV1 SSHW23 A-R5W3-XHE-S1-8 A-R51f3-XHE-S2-8 J
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 3 NO QCS SIGNo\l POS 10 of o S 6 or o Rerueling OA:R OR AUTO Refueling Outage. Outage TRAIN A POS-06 POS-RtO P0S-R6 Loops Isolated Loops Isolated in of Window in Window 3 of 3 of RIO R6 SGS-DRAINED-<:SD LOOPIS1x.ATED3D6 LOOPISOt.ATED3R 10 SGS-DRAINED-R LOOPISOLA TE03R6 SGS-DRAINEO-R
Feed and Bleed the RCS RHRS, Window 3 Feed and Bleed the RCS in RHR5, Window 3 Feed and Bleed Solely Vo'Ne the RCS in RHR5, Removed in Window Window 3 3 Failure to Diagnose Recoverable Loss of Rt-R in Window 3 D-R5W3-XHE PR5 303 FAILLRE OF FEED FALURE OF fEED AND SPILL USING At-0 SP~I Y,~,~ . 1-f'I FSW34H FSW34L A-R5W3-XHB-FH-4, A-R5W3-XHE-FL-4
Sof ety Valves Removed W-indow 3 Safely Valve Removed in Window 3 POS 6 of a Drained Maintenance Outage POS-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6 P0S-R6 PZR-SV-REMOVEDW3 P0S-R10 PZR-SV-REMOVEDW3
Feed and Bleed the RCS with V foiled 1n RHRS, Window 3 Feed and Bleed the RCS in RHR5 in Wirdaw 3 Foilure to Diagnose Recoverable Loss of RHR in Window 3 D-R5W3-XHE FALURE OF FEED FAR.URE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34H FSW34L A-R5W3-XHE-FH-8 A-R5W3-XHE-PL-8
Gravity from RWST ,n RHRS, Window 3 Gravity from RWST in RHR5 in Window 3 trl I. N UI \C) Safety Votve Removed in Window 3 INSUF FLOW Failure to Diagnose HROUG"H LOW HEAD Recoverable Loss of INJECTION FLOW RHR in Window 3 PATH D6-CG D-R5W3-XHE A-R5W3-XHE-G-5
UNITY IR5W4 RR5W4 VW4 FR5W4 GR5W4 SEQ # END-STA TE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD 6 OK 7 CD R5W4R6 Event Tree
- UNITY I IR5W4 I RR5W4 I VW4 I FR5W4 I GR5W4 I SEQ # END-STATE-NAMES I OK I 2 OK I I I 3 OK I I 4 OK 5 CD I 6 OK 7 CD R5W4R 10 Event Tree
UNITY IR5W4 RR5W4 SR5W4 FR5W4V SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 CD R5W4D6 Event Tree
Top Event for Loss of RHR-5 Window 4 PR!Q-RHR5 ' tr, I N [11 Probd>;lly Probd:;,rnty of POS ,0 Gr.l'ffl that £ OCCl.1'9 Refuoing OutO<JO in W4 given RK> DlRATW-R1J R(fl£L POS-R1J FRAC-POSIO P!l00-W4R1J DlRATIJN-R6 REFUJ. PROO-W4R6 DR--l.11 DU1ATION-06 PROO-W4D6 POS-06
Restore RHR given RHRS 1n Window 4 Restore RHR Given RHR5 in Window 4 Failure to Restore Failure to Diagnose Loss of RHR RHR, given RHR5 Recoverable Loss of POSs 3-13 in Window 4 RHR in Window 4 W3-S A-R5W4-XHE-R-5 D-R5W4-XHE
Sof ety Valves Not Removed 1n Window 4 Safety Valves Not Removed in Window 4 POS 6 of a Draine Maintenance Outage VW GO POS-06 POS 6 of a Refuelin POS 10 of a Outage Refueling Outoge P0S-R6 P0S-R10 Pressurizer Pressurizer Safety Valves Safely Valves Remov~d i7 ~.4~,6 Removed in W4R6 PZR-SV-REMOVEOW4 PZR-SV-REMOVEDW4
Reflux Cooling Given RHRS 1n Window 4
~~~l~x/~~~
in Window 4 Failure to Diagnose RCS Loops Isolated Recovercble Loss of to Couse Foilure RHR in Window 4 of Reflux Cooling mI SR~ 401 ISO-W4 N D-R5W4-XHE 0\ 0\ INSLf" FLOW TO 1 SG FRM AT LEAST 1 AFW PUMP LSW4 SR~ 4G3
- SR~ 404 A-R5W4-XHE-SP-8 Operator Failure FALURE OF FAL TO Q.OSE
- FALURE OF to Bleed the SECOf,OARY SOE BOTH PORVS SECONDARY SIDE SGs in Window
- HEAT REMOVAL HEAT REMOVAL 4
SSHW4 PORV1 SSHW4 A-R51H-XHB-S1-8 A-R5W4-XHE-S2-8
RCS Loops Isolated to Cause Foilure of Reflux 1n Window 4 NO ct.CS SIGNAL POS 10 of o S 6 of a Refueling OPER OR AUTO Refuefing Outage Outage TRAIN A ISOW GX> POS-06 POS-R10 POS-R6 Loops Isolated in of window 4 of RIO LOOPISO.ATE0406 SGS-DRAINEO-CSD SGS-DRAINED-R LD0Plsa..ATEd4R10 LOOPISQATE04R6 SGS-DRAINED-R
Feed and Bleed the RCS 1n RHRS Window 4 Feed and Bleed the RCS in RHR5, Window 4 Feed and Bleed Safety Valve the RCS in RHR5, Removed in Window Window 4 4 Failure to Diagnose Recoverable Loss of RHR in Window 4 D-R5W4-XHE FALURE OF FEED FAILURE OF "FEED AND SPLL USING AND SPU USING HPI . LPI FSW34H FSW34L A-R5W4-XHE-FH-5 A-R5W4-XHE-FL-5
Sof ety Valves Removed 1n W-indow 4 Safety Valve Removed in Window 4 tr] I N POS 6 of a Drained 0\ Maintenance Outage \0 POS-06 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safely Valves Refueling Outage Safely Valves Removed in W4R6 Removed in W4R6 POS-R6 PZR-SV-REMOVEDW4 P0S-R10 PZR-SV-REMOVEDW4
Feed and Bleed the RCS with V foiled 1n RHRS, Window 4 Feed and Bleed the RCS in RHR5, Window 4 Failure to Diagnose Recoverable Loss of RHR in Window 4 tT1 ~* FR5W VG1 0 D-R5W4-XHE FR5W VGZ FR5W VG3 FALURE OF FEED Operator Failure FALURE OF FEED AND SPLL USING to use *HHSI in AND SPLL USING HPI feed and spill LPI in Window 4 FSW34H FSW34L A-R5W4-XHE-FH-B A-R5W4-XHE-FL-B
Gravity from RWST 1n RHRS, Window 4 Gravity from RWST in RHR5 in Window 4 Safety Valve Removed in Window 4 INSUF FLOW Failure to Diagnose HROUGH LOW HEAD Recoveroble Loss of INJECTION FLOW RHR in Window 4 PATH D6-CG D-R5W4-XHE A-R5W4-XHE-G-5
Appendix E.6 Event Trees and High Level Fault Trees for Loss of Offsite Power (LI *
- E-272
- I UNITY I I11W1 l RL1W1 l VW1 I NL1W1 I SL1W1 I FL1W1 I GL1W1 I CL1W1 I SEQ # END-STATE-NAJI ES L 11'/~6 -- LOSP L 1, WINOOW W1, POS R6 1 @
2 @ 3 @ I . 4- CD I 5 CD 6 CD 7 @ I 8 CD I 9 CD 10 CD 11 @ I 12 @ l I 13 CD I 14 CD 15 @ I 16 @ I I 17 CD I 18 CD i
UNITY IL1W1 RL1W1 NL1W1 FL1W1 CL1W1
- SEQ # END-ST TE L 1W106 LOSS OF OFFSITE POWER CAT. L1, WINDOW 1 DRAINED MAINTENANCE 1
2 3 @ 4 CD 5 CD 6 @ 7 CD 8 CD
top event for L1 LOSP L1 1n window 1 PRBQ-Li lT1 N
--.J VI IL11rCDH Dl.R',TION-R IQ REF\.1!1. POS-RIQ FRI.C-POS IQ PRC8-WRIO CIJAAT!lN-R6 f<Efl.a POS-R6 PR06--Wffl DR-Mr DlR.t.TlotH)~ PROB-W-00 POS-00
Restore RHR given Li 1n POS 6 Refueling Failure to Restor ailure lo Diagnos Loss of RHR RHR glven L1 in LOSP Event in PDSs 3-13 OS B of* Refuelin S 6 of Refueling W3-S A-L1W1-XHE-R-13 D-L1W1-XHE
- Sof ety valves Not Removed
** Window 1
- Safety Vatvea Not Remove in Wincbw 1 POS l> of a POS 6 of o Craine Refueling Outage Maintenance Outage P0S-R10 POS-06 POS 6 of a Refuelin Outage POS-R6 Pressll'izer Safety Vawes Removed in WR6 PZR-SV-REMOVEDW1
Non-Recovery of AC Power 1n 144 min. of LOOP m I N* -...J 00 NL W1 Non-Recovery of AC Power in 2.00 HRS NRACZOO
Reflux Cooling In window 1 Fd>.re lo DioQnose RCS Locps lsololed L099 or RHR £vent to Cou!Ml Fcilure n POS 8 of Roflux Coofr19 ISO-WI D-L1W 1-XBJ!: INSU' FLOW TO SG FRM AT LEAST 1 AfW PU.I' A-LHl'i-XHE-Sf-1S OJ>er<!lor Foll.re FAURE OF FALTO CLOSE FALURE Cf" to Bleed lhe SECOtllARY SOE BOTH POINS SECOIOARY SIDE SGs I rj,eo LI 1£AT REJ.40,I.II.. l-£AT REl.4CW.11.. SSH\111 Pl'.Rl/1 SSI-INI
.A-Li'W'i-XHE-Sl-13 A-LlWI-XH!-S2-13
Reflux Cooling window 1 RCS Loops Isolated to C:luoo Fci!u-e of Reflux Cooi~ ISO-WI D-L11'1-XB~ INSlF FLOW TO SG FRM AT LEAST 1 f.f'N PUl,f' A-L!Wl-XHl'!-SP-17 FALTO Q.OSE FALUlE CF BOTH PORVS SECO'°ARY SIDE
!-£AT RE>,KM!l SSI--H,'I
..l-LlWI-XHE-91-17 A-LlWI-XH!-S2-17
RCS Loops isolated to cause failure of reflux 1n window 1 ~ N 00 NO a.cs SklN'L OS 6 of o Refuellng OPER 00 AlJTO outage TMN A POS-06 POS-R10 POS-RS Loops Isolated tn or window 1 of Rkl LOOP1Sa..ATED1JS SGS...'.OflAII.EO-CSO SGS-!FAtlED--R LOOPISOlATED'Rll LOOPISa..ATEDR6 SGS--ORAINED-R
Feed and Bleed the RCS 1n L 1, Window 1 Feed ood Bleed the RCS In L1, Window I Food crrd Bk19d SoMy VONe the RCS In L1. Removed In Wirdow POS 6 or Refue,ng 1 SV-W1 tTl I N R5 Fcik.-o lo Dkl<lnoso Loso of RHR £vent In POS 6 D-Lllfl-XIIE FALURE OF FEED FALURE OF FEED AND SPllL USNl AND SPLL USING LPI HP1 FSl'/12.. FSW12H A-LlWl-:XHE-FL-0 A-L11fl-XHB-PH-O
Feed and Bleed the RCS L1, Window 1 Feed ood Bleed the RCS In l\ W-ridow r Food ood Bl<loo Solely Vcwe the RCS In Lt Removed In Window PDS 6 of Reruelng 1 SV-W1 D-Lil'l!-XIIE f ALURI: Of FEED FALURE Of FEED AfO SPLL USING A1'0 SPLL USNG LPI HP1 FSW12L FSW12H A-LlWl-XHE-FL-9 A-Llll'l-J:HB-PH-9
Feed and Bleed the RCS in L 1, POS 6 of Retuenng Failure lo Diagnose Loss of Rf-R Event in POS 6 D-L1W1-XHE FALURE OF FEED FALL.RE OF FEED AI\O SPILL USING AND SPLL USING LPI I-Pl *:,;/ FSW12L FSW12H A-L1W1-XHE-FL-U- A-L!Wl-XHE-FH-14
Feed and Bleed the RCS in L1 POS 6 of Refuehng Failure lo Diagnose Loss of RI-R Event in POS 6 D-L1Wi-XHE Operator failure FAl URE OF FEED FALLRE Cf" FEED to use LHSI in Al'D SPILL USING AND SPlL USING Feed and Spill LPI HPI in Window 1 FSW12L FSW12H A-L!Wi-XHE-FL-16 .A-L1W1-XHE-FH-1B
Gravity from RWST 1n L 1, Window 1 Gravity from RWST in L1, POS 6 of Refuering tT1. w 00 0\ Safety Valve Removed in Window 1 sv-w, INSlf FLOW Fa~re to Diagnose
~OUGH LOW HfAD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D-L1W1-XHE A-L1W1-XHE-G-6
Gravity from RWST ,n L 1, Window 1 Gravity from RWST in L1, POS 6 of Refuering tTl I
- N 00
-..J Safety Valve Removed in Window 1 SV-W1 INSUF FLOW Foi~re to Diagnose
~OUGH LOW HEAD Loss of RHR Event INJECTION FLOW in POS 6 PATH D6-CG D-L1W1-XHE A-L1W1-XHE-G-10
Safety Valves Removed ,n Window 1 Safety Valve Removed in Window 1 POS 10 of a POS 6 of o Drained Refueling Outage Maintenance Ouloge P0S-R10 POS-06 POS 6 of o Refuelin Pressurizer Outage Safety Valves Removed in W'H6 P0S-R6 PZR-SV-REMOVEDW1
Failure of High Pressure Recirculation 1n Window 1 Failure of High Pressure Reoiroul11.tion 1 Safety Valve Removed in Window 1 CL1W1N4 SV-W1 INSUF FLOW FM INSUF FLOW FRM Failure to Diag10se ailure of Recirculatio LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window CHARG PUMP suer THE RECIR MODE in POS 6 1 HOR H1 H2 . PL1W1-4 D-L1W1-XH1i A-Li W1-XHE-C-4
Failure of High . Pressure Recirculation 1n Window 1 Failure of High Pressure Reoiroul11.tion l Safety Vaf./e Removed in Window 1 CL1W1N8 SV-W1 INSLJF FLOW FM INSUF FLOW FRM Faill.ff"e lo Dia~se ailure of Recirculatio Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of Rf-R vent Spray in Window to Esloblish CHARG PUMP SUCT THE RECIR MODE in POS 6 1 High P Recirc HOR in Window 1 H1 H2 PL1W1-B D-L1W1-XHE A-L1W1-XHE-C-8
Failure of High Pressure Recirculation 1n Window 1 Failure of High Pressure Rcoiroul 11.tion mI N' '° CL1W'1N13 INSUF FLOW FM INSLf' FLOW FRM Failure lo Dio~se oilre of Recirculotio Operotor Foilure LPSI PM'S TO 3 CHRG PM'S IN Loss of RHR vent Sproy in Window to Establish CHARG PUMP S\JCT THE RECIR MODE in POS 6 1 High P Recirc I-OR in Window 1 H1 H2 PL1W1-13 D-L1W1-XHE A-L1W1-XHE-C-13
Failure of High Pressure Rec1rculot1on
,n Window 1 Failure of High Pressure Reoiroul11.tion CL1W'1N17 INSLf FLOW FM INSLf FLOW FRM FoilLre to Diagnose oiu-e of Recirculatio LPSI PWS TO 3 CHRG PM'S IN Loss of RI-R Event Spray in Windaw CHARG PUMP SUCT THE RECIR MODE in POS 6 1 I-OR H1 H2 PL1W1-17 D-L1W1-XHE A-L1W1-XHE-C-17
tTl I N ~ H'.S Pl..111"' VW1
mI A-l 1111-Xl£-C-ll D-l1111-)0£ N '£ L' K'.S t\o\SH.G Vent Exist,,
\flffi.12 R.11/Hl vm R.1111-6
.1.4.flil--XtE-C-13 CH..flil--XIE Fl..l<<l--13
[H.t!/1-)0£ VEllll Tl l'Lt!/'M7 v.r, l'L'M'l-17
tTl I Failure to Diagnose Operator Failure N Loss of RHR Event to Establish ~ in POS 6 Recirculation S r in W1 PL 1X4 D-L iW1-XHE A-L 1W1-XHE-P-4 FAIL URE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCULATION F2LPS0' F1.PSD
Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S r in W1 PL 1X8 D-L TW1-XHE A-L 1W1-XHE-P-8 FAILURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCULATION F2LPS0 1 F1..PS0
mI Failure to Diagnose Operator Failure N Loss of RHR Event to Establish '° '° in POS 6 Recirculation S r in W1 PL 1 1W13 D-L 1W1-XHE A-L 1W1-XHE-P-13 FAILURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCULATION F2LPSD 1 Ft..PSD
t;rl
~. Failure to Diagnose Operator Failure 0
0 Loss of RHR Event to Establish in POS 6 Recirculation S r in W1 D-L TW1-XHE A-L 1W1-XHE-P-17 FAILURE OF OUTSIDE FA LURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCULATION F2LPSD F1..PSD L
- I UNITY I IL1W2 I RL1W2 I VW2 I NL1W2 I SL1W2 I FL1W2 I GL1W2 I CL1W2 I SEQ #
- END-STATE-NAM ES L 1W2R6 -- LOSP L 1, WINDOW W2, POS R6 1
z @ 3 I 4 CD I 5 CD 6 CD 7 I 8 CD I 9 CD 10 CD 11 @ I 12 @ I I 13 CD I 14 CD 15 I 16 @ I I 17 CD I 18 CD
UNITY IL1W2 RL1W2 NL1W2 S11W2 FL1W2 CL1W2 SEQ #
- END-ST TI L 1W2D6 -- LOSP L 1, WINDOW W2, POS D6 1 @
2 @ 3 @ 4- @ 5 CD 6 CD 7 @ 8 @ 9 CD 10 CD
top event for L1 In window 2 trl PRBQ-Ll I <.,J 8 D.1 28 DUAATION-R IQ REF\JU. POS--ll!O FR/\C-POSIO PROB-l1'2RIO POS--<<6 PROB-WZRft DIHIT Dlftl.TlotH>& P110B-l1'2Dft
Restore RHR given Li in POS 6 Refueling Failure to Restor ailure lo Diagnos RHR elven 11 in LOSP Event in Loss of RHR OS 6 of Refuelin PDSs 3-13 OS 6 of Refueling W3-S A-L1W2-XHE-R-13 D-L1W2-XHE
- Sof ety valves* Not Removed Window 2 Safely Valves Not Remove in Window 1 POS 10 of a OS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-06 OS 6 of a Refueling Outage P0S-R6 Pressurizer Safety Vwes Removed in W1R6 PZR-SV-REMOVEDW2
Non-Recovery of AC Power 1n W2 tr1 I , v.l 0 °' NL W2 NON- Recovery of AC Power
. in 2.62 HRS NRACZ62
Reflux Cooling window 2 RCS Locps lsololed 10 Couse Foiltre ~ of Reflux Coo[nQ 0 -.J 190-W.! D-LJ11'2-XHE INSlF rLow TO SG fRM AT LEAST 1 AfW PUW LSlfi13 A-L1'W'2-XHB-SF-13 FALLRE OF FAl TO CLOSE SECOIOARY SOE BOTH PORVS HEAT REM(MII. BSH1Ti13 POR\11 8SHlfi13
.A-L!W2-XBB-BJ-J3 .A-L1W2-XBB-S2-13
Reflux Cooling 1n window 2 RCS Loops lsololed 10 Cau9e Failure tT1 of Rof~x Cooing t,.l 0 00 180-Wll D-LJ'l!'e-XHE INSLF fLOW TO SG FRM AT LEAST 1 AfW PUMP LSlf23 A-L1Yl'2-XHB-ST-17 FALL.RE <1!' FAl TO CLOSE FAILURE Cf" SECONDARY SIi)£ BOTH PD/NS 5ECOI-OARY SIDE HEAT REM<111>L l-£AT REMWl>L SSHIT23 POR\/1 BSHlfaJ I A-L1W2-XB8-6J-17 A-L1We-XBB-Se-l7
RCS Loops isolated to cause failure of reflux 1n window 1 RCS Loops Isolated lo eou,,., Fa\re or R&llllx Cooing NO CLCS SCW>I.. 6 of o Refudlrq OPER OR AUTO outage TRAIN A 190 20lil POS-06 P0S-R10 Secondary Side Loops Isolated or see Drained In or wll\dow In PO$s 6 ?'" I of RIO LOOPISOLA TED2D8 SGS-DRAt.ED-CSD LOOPISOLA.TBDl!R 10 LOOP ISOLA TED2R6 SGS-DRAINED-fl
Feed and Bleed the RCS In L 1, . Window 2 Feed Cl'ld Bl<lt-L111'2-XHE f AL\ft OF FEED AND SPLL USING LPI FSW1a. A-LlWl!-XBB-FL-0 A-Lllfil-XHE-l"B-O
Feed and Bleed the RCS
- L 1, Window 2 Food and B!Goo SOl~ty VONe the RCS In L} Remol/ed in Window PO~ 6 of Refue ng 2 ffV-lr2 tr1 I
\>J D-i.11'2-XHE rALURE OF FEED FALOOE Of FEED ANO SPU USING ANO SPLL USN3 LPI 1-f'I FSW12L FSW12H A-Ll'/1'2-XBB-FL-9 A-Lllr~-XHE-FB-9
Feed and Bleed the RCS in L1 POS 6 of Refuehng Failure to Diaqnose Loss of RI-R Event in POS 6 m I D-L1W2-XHE vJ N FALURE OF FEED FALURE OF FEED AflO SALL USING AND SPLL USING LPI I-Pl FSW12L FSW121,l A-L1 W2-XHE-FL A-L1W2-XHE-FH-14
Feed and Bleed the RCS in L 1 POS 6 of Refueling Failure lo Diagnose Loss of RI-R Event in POS 6 I ' D-LlWZ-XHE FALURE OF FEED FALIBE OF FEED AN) SPILL USING AND SPLL USING LPI f-PI FSW12L FSW121rl A-L1W2-XHE-FL-18 A-L1WZ-XHE-FH-16
Gravity from RWST In L 1, Window 2
- Gravity from RWST in L1, POS 6 of Refuenng Safety Valve Removed in Window 2
sv-we INSLf: FLOW F<i~re to Diagnose
~OUGH LOW 1-f'AD Loss of RHR Event N.f:CTION FLOW in POS 6 PATH D6-CG I
D-L1W2-XHE A-Ll"W2-Xm:-G-6
Gravity from RWST ,n L1, Window 2 Gravity from RWST in L1, POS 6 of Refueling Safely Valve Rem<)Ved in Window 2 SV-W8 INSL.f" FLOW Falure to Diagnose OUGH LOW 1-£AD Loss of RHR Event N£CTION FLOW in POS 6 PATH D6-CG D-L1W8-XHE A-Ll'W'B-XHE-G-10
Sof ety Valves Removed Window 2 Safely Valve Removed in Window 1 SI/ W2 POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-D6 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W'fl6 P0S-R6 PZR-SV-REM
Failure of High . Pressure Rec1rculat1on
,n Window 2 Failure of High Pressur0 Reoirouh.tion Wl d Safety Vawe Removed in Window 2
CL!Wi?CPZM SV-W2 CL1Wi?N4 INSUF FLOW FM INSUF FLOW FRM Failure lo Dia~ose ailu-e of Recirculatio Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of Rffi vent Spray in Window to Establish CHARG PUMP SUCT THE RECIR MOOE in POS 6 2 High P Recirc HDR in Window 2 H1 H2 ;FL1W2-4 D-L1W2-XHE A-L1W2-XHE-C-4
F01lure of High . Pressure Rec1rculat1on Window 2 Failure of High Pressure Reoiroulation 1 tr1 I ~ 00 Safety Vatve Removed in Window 2 L1W2CPZM SV-W2 CL1W2NB INSLJF FLOW FM INSUF FLOW FRM Failire to Diagnose aik.re of Recirculatio LPSI PMPS TO 3 CHRG PMPS IN Loss of R~ Eveni. Spray in Window CHARG PUMP SUCT THE RECIR MODE in POS 6 2 HOR H1
- H2 PL1W2-8 D-L1W2-XHE A-L1W2-XHE-C-B
Foilure of Hi_gh Pressure Recirculation 1n Window 2 Cl.iWSNt:1 a.1w a13 D-Lllf3-:IH! ..t.-Lllf3-XHB-:I Hl H2 PLllfZ-13 PS1fll8 D-Ll'll'Z-Xllll A-LIWZ-XHJ:-C-13
Failure of High Pressure Recirculation 1n Window 2 CUW2Kl7 CL111' G17 D-L111'Z-lCH* .I.-LlW2-Xllll-l[ HI PL111'2-l'T D-L111'2-XBll .A-t1we-xm-c-1r
Foilure of Recirculation Spray in Window 2-couse HPR f oilure Failure of Reolroul 11.tion Spray In loss of tf'SH du to open contdrme L1W2CPZld CON-VFC-RP-COREM Falum to Diagnose Operator Falure Loss of Rf-R Event to Establish in POS 6 Recirculation in W2 D-L1W8-XHE A-LlW2-XHE-P-4 FAL~E OF l'lSDE AlURE OF OUTSIDE Y RECRCl!ATION PRAY RECIRCLlAWN F1.PSD F2LPSD
Foilure of Recirculation Spray in Window 2-couse HPR f oilure Failure or Reolrouhtion Spray In loss of 1-PSH d to open contoinme L1W2CPZM CON-VFC-RP-COREM fcilure to Di~ose Operator failure Loss of RI-R Event to Establish in POS 6 Recirculation in W2 D-LlW,2-XHE A-LlW8-XHE-P-B FAL~E OF NSOE ALURE Of OUfSDE RAY RECRCUATION PRI\Y RECIRCllATKJN f1.PSD F2LPSD
Foilure of Recirculation Spray in Window 2-cause HPR failure Failun of Rcolroullltion Spray In loss of IPSH
. du to open contcirme L1W2CPZM CON-VFC-RP-COREM f cilure to Diag,ose Loss of Rift Event in POS 6 D-L1W2-XHE A-Ll'W'2-XHE-P-l3 FALl.~E OF t!SDE ALURE Of OUfSDE Y RECRCUATION PRAY RECIRCU.ATION f'LPSD F2LPS0
Foilure of Recirculation Spray in Window 2-couse HPR f oilure Failure of Reolroul 11.tion Spray In loss of 1-PSH to open conlciJYTie L1W2CPZM CON-VFC-RP-COREM f alure to Diagnose Loss of Rtft Event in POS 5 D-L1W2-XHE A-L1W2-XHE-P-l7 FAL~E OF NSDE ALURE Of OUTSIDE Y RECRCUATION PRAY RECIRCU.ATKJN f1..PSD F2LPSD
Correnotlon to Recirculation FTa (c and P) in Windo 2 tT1 l,l ~ Operator Fllilure FAILURE OF FEED to Croaa Connect A D SPILL USING H R ST Given success ul FSW12H D-Ll'W2-XHE A-Ll 'W2-XHE-X
L VENTLTZ Pl.1112N4 R:M'2-4
A--t. l!V2-XtE-C-8 L Vent Ex!ots Wl2 F\.1112-8
tT1 .i.-t M2.-Xtt:-C-13 D-l t,¥2-)(1£ ~ N 00 H'.S KA.SH..G Venl Exists
'¥ENl1. t2. Fl. flll2Nl3 wn. Fl..fll/2-13
IH..1112-)0£ L PLIW2-17
tT1 I Failure to Diagnose Operator Failure w w Loss of RHR Event to Establish 0 in POS 6 Recirculation S ra in W2 PL 1 2X4 D-L 1W2-XHE A-L1W2-XHE-P-4 FALURE OF OUTSIDE FAILURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCLLATION F2LPSD F1LPSD
. Failure to Diag_nose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W2 PL 2X8 D-L 1W2-XHE A-L 1W2-XHE-P-8 FAIL URE OF OUTSIDE *FAILURE OF INSIDE SPRAY RECIRCULATIO SPRAY RECIRCULATIO
*\:/
... a*~\ '* .
F2LPSD F1LPS0
Failure to Diag_nose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W2 D-L 1'W2-XHE A-L 1W2-XHE-P-13 FAILURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATIO SPRAY RECIRCULATIO F2LPSD F1LPS0
m I Failure to Diagnose Operator Failure w w Loss of RHR Event to Establish w in POS 6 Recirculation S ra in W2 D-L1W2-XHE A-L 1W2-XHE-P-17 FALURE OF OUTSIDE FAILURE OF INSIDE PRAY RECIRCULATION PRAY RECIRClA...ATION F2LPSD F1LPS0
UNITY IL1W3 RL1W3 VW3 NL1 W3 FL1W3 GL1 W3 SEQ # END-STATE-NAMES L 1W3R6 -- LOSP L 1, WINDOW W3, POS R 1 @ 2 @ 3 @ 4- CD 5 CD 6 @> 7 CD 8 CD 9 @> 10 CD 11 @ 12 CD
- I UNITY I IL1W3 I RL1W3 I NL1W3 I SL1W3 I FL1W3 I SEQ # END-STATE-NAME,!
L 1W3D6 -- LOSP L 1, WINDOW W3, FDQS 06 I 1 @ 2 @ 3 @ I I I 4 @ I 5 CD 6 @ I @ I I I 7 8 CD
UNITY I11W3 RL1W3 VW3 NL1W3 FL1W3 GL1W3 SEQ # END-STATE-NAMES L 1W3R 10 - - LOSP L 1, WINDOW W3, POS 10
@I 1
2 @ 3 4- CD 5 CD 6 @I 7 CD 8 CD
@I 9
10 CD 11 @ 12 CD
top event for L1 In window 3 PRBQ-Li IL! 38 DlRATION-RIO REl'Ul. POS-RIO FR.l.C-POSIO PROB-lf3RIO
- POS-R6 PR0B-'ll'3R8 DR-MT PROB-w:m~
Restore RHR given L1 Failure to Restor lo Diagnos RHR 2lven Li in LOSP Event in Loss of RHR OS 6 of Refuelin P0Ss 3-13 S 6 of Refueling W3-S A-L1W3-XHE-R D-L1W3-XHE
- Sof ety valves Not Removed 1n Window 3 *
- Safety Valves Not Remove in Window 3 OS 6 of a . Drdned Mointer1011ce Outage VW G7 VW GO POS-D6 OS 6 of a Refueling POS 10 of a Outage Refuefing Outage VW G4 VW Gl P0S-R6 P0S-R10 Pressurizer Presstrizer S<ifety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEOW3 PZR-SV-REMCNEDW3
Non-Recovery of AC Power NL W3 Non-Recovery of AC Power in 3.48 HRS NRAC346
Reflux Cooling 1n window 3 RCS Locps lsololed 10 CoU9e FdilH'e of Reflux Cooing IB0-W3 D-LJlf3-XHE INSU' fLOW TO SG FRM AT LEAST 1 AfW P\JMP LSlfilJ A-LiW3-XBB-SF-!I Operator Faihxe FAURE Of FALTO CLOSE FAI..URE CF to Bleed the SECMJARY SIO BOTH PORVS !;ECONDARY SIDE SGs 1 given L1 HEAT REMOV.al.. l-£AT REMCW.al.. BSHlfaJ
.i-L1W3-XHl!:-s1-!I A-Lllf3-XHE-se-!I
Reflux Cooling 1n window 3 RCS Loops lsololed to COU98 F011ure of Ref~x Coolir19 ISO-'W3 D-LJW3-XHE INSUF FLOW TO SG FRM AT LEAST 1 AfW PVMP. A-Li'WS-XBB-SF-8 FAURE OF FAI. TO Q.OSE FAILURE CF SECmllARY SOE BOTH PORVS SECONDARY SIDE 1£AT REMO-I.IL I-EAT REMCN.11.. 9SHW3J A-LlW3-XB!:-sJ-B A-LIW3-XHE-B2-B
RCS Loops isolated to cause failure of reflux 1n window 3 RCS Loops lsololed to COJso Fau-e or Refklx Cooing NO a..cs SIGNAL OS 6 of o Refue!in;J OPER ffi AlJfO outage TIW'l A POS-06 P0S-R10 P0S,-R6
~Or~
In POS3 6 or SGS-~ LOCFISa..ATE03D6 LOCf'1Sa..ATE03R'£l SGS-OfW,EO--R LOCf'rsa.ATE03R6 SGS--ORAINED-R
Feed and Bleed the RCS L 1, Window 3 Feed clld Bleed the RCS In L1, W-ndow J feed clld Bkloo Solely V<:he lhe RCS In L1 Removed In Window J BV-11"3 Fab"o lo Dloono~o Loos of RfR Cvent D-Lill'3-XHE rALI.RE <:K FEED FALi.RE Of FEED Afl) SPlL USNl AND SPLL I.JSt,K) LPI HPI FSW1a. FSW12H A-L1W3-J:BB-FL-t A-Llll"J-Xll!!-FB-t
Feed and Bleed the RCS L 1, Window 3 Sal~ly Vd.ie Removed in Window J 8V-lf3 Fa!\ro lo Dkimoso Loss of Rffi £vent D-L11'3-XHE f AllmE (K FEED FAL\ff: (K FEED MO SPLL USNG MO SPU. USN'.l LPI H'I FSW1a FSW12H A-L1W3-XD8-PL-7 A-L111"J-XHE-r11-7
Feed ond Bleed the RCS in L1 Failure lo Diag_nose Loss of Rf-R Event D-L1W3-XHE FALURE OF FEED FAL~E OF FEED Operator Failure Af\O SPILL USING AND SPLL USING to use HHSI in LPI f-PI feed and spill in Window .3 FSW34L FSW34H A-L1W3-XHE-FH-10 A-11 W3-XHE-FL-10
Feed ond Bleed the RCS in L1 Failure lo Diagnose Loss of RI-R Event D-L1W3-XHE FALURE OF FEED FAL~E OF FEED Af\O SPILL USING AND SPLL USING LPI. I-Pl FSW34L FSW34ll A-L1W3-XHE-FL-12 A-L1W3-XHE-FH-18
Safety Valves Removed 1n Window 3 Safety Valve Removed in Window 1 POS 6 of a Drained Maintenance Ouloge POS-DB POS 6 of a Refuelin Pressurizer POS 10 of a Pressu-izer Outage Safety Vdves Refueing Outage Safety Valves Removed in W'R6 Removed in W1R6 POS-RB PZR-SV-REMOVEDW3 POS-R10 PZR-SV-REMOVEDW3
Gravity from RWST In L1, Window 3 Gravity from RWST in L1, Safety Valve Removed in Window 3 SV-W3 INSL.f" FLOW F<i~re to Diagnose OUGH LOW 1"£AD Loss of RHR Event Nf:CTION FLOW PATH D6-CG D-L1W3-XHE A-L1 W3-XHE-G -I!
Gravity from RWST ,n L1, Window 3 Gravity from RWST in L1, ~ VI 0 Safety Valve Removed in Window 3 SV-W3 F<il.lre to Diagnose Loss of RHR Event D6-CG D-L1W3-XHE A-L1W3-XH!!-G-8
I UNITY I I11W4 I RL1W4 I VW4 I NL1W4 I FL1W4 I GL1W4 I SEQ # END-STATE-NAMES
- L 1W4R6 -- LOSP L 1, WINDOW W4, POS Rio 1 @
z @ I 3 I 4- OK 5 CD 6 @ I I 7 OK 8 CD 9 @ 10 CD 11 @ 12 CD
UNITY IL1W4- RL1W4- NL1W4 SL1W4- FL1W4- SEQ # END-STATE-NAME
- L 1W406 - - LOSP L 1, WINDOW W4, OS D 1
2 @ 3 @ 4 5 CD 6 7 8 CD
I UNITY I IL1W4 I RL1W4 I VW4 I NL1W4 I FL1W4 I GL1W4 I* SEQ # END-STATE-NAMES L 1W4R10 -- LOSP L 1, WINDOW W4, POS F 10 1 2 @ I 3 I 4 OK 5 CD 6 @ tT1 I t,J u, I 7 OK l.>.l 8 CD
' 9 @
10 CD 11 @ 12 CD
top event for L1 In window 4 PRBQ-Ll DU>ATJON-R IO REflJEl. POS--RIO FRAC-POSIO FR0B-lUR10 POS-R6 DIHir l'ROB-W'.U)ft
Restore RHR given L1 Failure to Rester ailure lo Diagno:s RHR glven Li in LOSP Event in Loss of RHR OS 6 of Refuelin PDSs 3-13 OS 6 of Refueling W3-S A-L1W4-XHE-R-5 D-L1W4-XHE
Safety valves Not Removed Window 4 Safety Valve:, Nol Remc:Ne in Wlndow 3 WJ GO POS-06 POS 6 of o Refuelin POS 10 of o Outage Refuelng Outage WJ G4 P0S-R6 POS-Rt:i Presstrizer Sofely Vctves Removed in W4-R6 PZR-SV-REMOVEDW4 PZR-SV-REMOVEDW4
Non-Recovery of AC Power mI ' l,;J Vt ._;i NL W4 Non-Recovery of AC Power in 4.55 HRS NRAC455
Reflux Cooling window 4 Foliro lo DioQ nose RCS Loops lsokiled Loss of RHR £vent to C<luse Fciltre n POS 8 of ReO.ix Cooling m ~ u, 00 D-Ltlf-&-XBB INSl.f" FLOW TO SG FRM AT LEAST 1 /.FW PVl,P A-L1W4.-XIIE-SP-:! Dperolor Fdkre FALTO O..OSE FALURE Cf" to Bleed the BOTH PORVS SECONDARY SIDE SCs 1 given L 1 ~AT REMWAL SSBW-& A-LLW4-XHE-S1-!I A-LIW-&-XHB-S2-~
Reflux Cooling ,n window 4 Fcikre lo DioQnose RCS Loops lsololed L099 of RHR 1'.ver,t to CoU9e Folire n POS 6 of Reflux Coolino IBO-'W~ D-LJw,-xua INSI.F fLOW TO SG FRM AT LEAST 1 AfW PVM' A-Li'IH-XHE-BP-B Operator Fcilure FAIL TO O.OSE FAILURE Cf' to Bleed the BOTH PORVS ~CONOARY SIDE SCs I rj,en LI I-EAT REMO.IN. SSHlf, POOV1 ssuw, A-Lllf4-XHB-S2-6
RCS Loops isolated to cause failure of reflux 1n window 4 NO a..cs SK:N6L OS. 6 of o Refueling
- OPER 00 AUTO Outage TRAN A W.V GIO POS-06 POS-R10 POS-R6 Loops ls>Olated Loops Isolated Looe,, Isolated In window 4 or In or whdow In window 4 of 06 4 of R,:J RS SGS-Dfll.Ul}---Cg} LOOP ISOLATEl>'DB SGS--ORAlt-ED-R
- Feed and Bleed the RCS L 1, Window 4 Feed ood 81ood the RCS rn L1, W-ndow 4 f 800 ond 6180<! Safety Vaf.le the RCS In L1 Removed In Window 4
SV-lf, Fcftro lo Dkmo$o Loss of R1R [vent I>-LJlH-XBE f ALlflE Cf" fEED fAL~ Of fEED I MO SPLL USNl LPI MO ~USM 1* A-LlW4-XHE-TL-O A-Lrn-xeB-PH-O
Feed and Bleed the RCS L 1, Window 4 Feed and Bleed the RCS In L1, Wndow 4 fGed ond 6!800 Solely VONe
!he RCS In L1 Removed In Window 4
FCIU"O lo Dkm<J30 Loss of ~ £vent f ALI.RE OF FEED FAL~ OF FEED AIO SPLL usu:; Afll SPU. USN; LPI H'1 A-Llll'~-XH!:-rL-8 A-Llll'~-XBB-PH-8
- Feed and Bleed the RCS in Ll Failure to Diaq_nose Loss of RI-R Event D-L1W4--XHE FALURE OF FEED FAL~E OF FEED Operator Failure AI\O SPILL USING AND SPLL USING to use HHSI in LP! I-Pl feed and spill in Window 4 FSW34L FSW34tH A-L1W4-XHE-FL-10 .A-L1W4--XHE-FH-10
Feed and Bleed the RCS in L1 Failure to Diagnose Loss of Rf--R Event D-L1W4--XHE FALURE OF FEED FAL~E Of FEED Af\O SPILL USING AND SPLL USING LPI I-Pl FSW34L FSW3H1 A-L1W4-XHE-FL-12 .A-L1W4--XHE-FH-12
Gravity from RWST 1n L1, Window 4 Gravity from RWST in L1 Safety Valve Removed in Window 4 SV-W4 INSLf" FLOW Foik.Jre to Diogoose OUGH LOW !-£AD Loss of RHR Event N£CTION FLOW PATH D6-CG D-L1W4-XHI!:
Gravity from RWST 1n L1, Window 4 Grayity from RWST in L1 Safety Valve Removed in Window 4-SV-W4 INSLf FLOW Fd'-ire to Diog_nose OUGH LOW 1-£AD Loss of RHR Event N.ECTION FLOW PATH D6-CG D-L1W4-XHE .A-L1W4.-XHE-G-B
Safety Valves Removed
* -Window 4 Sofety Volve Removed in Window 1
POS 6 of o Drained Maintenance Outage POS-06 POS 6 of o Refuelin Pressurizer POS 10 of a Presst.rizer Outoge Sofety Vdves Refueing Outage Safety Valves Removed in W4R6 Removed in W4R6 P0S-R6 PZR-SV-REMOVEDW4 POS-R10 PZR-SV-REMOVEDW4
1 Appendix E. 7 Event Trees and. High Level Fault Trees for Loss of Offsite
- Power(L2)
E-368 *
- PNITY I IL2W1 I RL2W1 I VW1 I NL2W1 I SL2W1 I FL2W1 I GL2W1 I CL2W1 I SEQ # END-STATE-N1~ ME L2W1R6 -- LOSP L2, WIJ\OOW W1, POS R6 '
1 @) 2 3 @ I 4 CD I 5 CD 6 CD 7 @ I 8 CD I g CD 10 CD 11 @ I 12 @) I I 13 CD I 14 CD 15 I 16 @ I I 17 CD I 18 CD
UNITY I12W1 RL2W1 NL2W1 FL2W1 CL2W1 SEQ # END-ST TE L2W1D6 -- LOSP L2, WINDOW W1, DRAINED MAINT. POS 6 1 2 3 @ 4 CD 5 CD 6 @ 7 CD 8 CD
top event for L2 LOSP L2 window 1 IL2W 02 FRBQ-Lll IL2W 014 D\J!ATION-R IQ POS--RIO FRAC-POSIO PRCB-WRIO Dtll1ATllN--R6 POS--R6 PR06-Wffl OR--IIT PROO-Willi
Restore RHR given L2 1n POS 6 Refueling Failure to Restor ailure lo Diagnos RHR 2tven 12 in LOSP Event in Loss of RHR PDSs 3-13 OS B of Refuelin OS 6 of Refueling W3-S A-L2W1-XHE-R-13 D-L2W1-XHE
Non-Recovery of AC Power 1n 144 min. of LOOP I ' Non-Recovery of AC Power in 2.00 HRS NRACZOO
Reflux Cooling 1n window 1 Fdu-e to D/oQnoso RCS Locps lsololed Loss or RHR £vent to QJU9<! Fcilll"G h POS 6 o1 Reflux CoolinQ ISO-WI D-L2W1-XHE INSL.f" rLOW TO SG FRM AT LEAST 1 AfW PVW LSN1 A-LeWJ-XHB-sr-13 FALTO CLOSE FAL~ Cf" BOTH PORVS SECOtoARY SIDE I-EAT REMOJAL SSHW1 SSHNI 0 A -L21fJ-li:BB-BJ-13 A-L21f1-XBB-S2-13
Reflux Cooling ,n window 1 Foikre lo DloQnoso RCS Locps Isolated Lo9s or RHR tvent to CoU96 Failtre ii POS 6 of Reflux Cooi119 D-Le'Ki-XHE LSW1 A-L2WJ-J:HH-SF-i7 FALL.RE Cf" FALTO CLOSE FALURE OF SECOI-OARY SOE BOTH POR\IS SECONDARY SIDE IEAT REMo'.N.ll I-EAT REMCN.ll SSHNI
.A-Ll!lfl-XBB-BJ-17 .A-Ll!'lfi-XBB-se-17
Feed and Bleed the RCS 1n L2, Window 1 feed and Bleed the RCS In L2, W-11dow I food md Bkled So19ly Vd,/e the RCS In L2 Removed In Window POS 6 of Reruelng 1 SV-WI f<iluro lo Dloonoso
- Loss of RHR £vent In POS 6 D-L2Wl-XHE fALURE Of FEED ANO SPLL USNG LPI fSW12L A-L2W1-J:BB-PL-!! A-L21H-XJ!E-FB-!!
- Feed and Bleed the RCS 1n L2, Window 1 Feed and Bleed the RCS In L2, W-rxlow 1 Feed ood Bleed Sol~ty V<:J./e the RCS In L2 RemoYed In Window POS 6 or Refueing 1 SV-W1 tTl I
w -..J -..J D-L2Wl-XHE f ALIJRE OF FEED FALi.ff OF FEEi> MO SPlL USING AND SPLL USING LPI HP1 FSW12H A.-LaWJ-XBB-PL-9 A-LllWl-XHE-FB-9
Feed and Bleed the RCS in L2, POS 6 of Refuehng Failure lo Dioqnose Loss of RI-R Event in POS 6 tr1 . D-L2W1-XHE I w ...J 00 FALURE OF FEED FALLRE OF FEED AN) SPILL USING AND SPLL USING LPI I-Pl FSW12l FSW12~ A-L2W1-XHE-FL-14
- A-L2W1-XHE-FH-14
- Feed ond Bleed the RCS in L2 POS 6 of Refuetlng Failure to Diagnose Loss of RI-R Event in POS 6 t'TI 1 '
D-L2W1-XHE t,J -.J \0 FAl URE OF FEED FALL.RE OF FEED Operator Failure Af\D SPILL USING AND SPLL USING to use HHSI in LPI I-Pl f~ed .and spill 1n Window 1 FSW12L FSW12f-j A-LZW1-XHE-FL-18 A-L2W 1-XHE-FH-18
Gravity from RWST 1n L2, Window 1 Gravity from RWST in L2, POS 6 of Refueling Safety Valve Removed in Window 1 SV-W1 INSLf FLOW Fa~re to Diagnose OUGH' LOW !-£AD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D6-CG D-L2W1-XHE A-L2W1-XHE-G-6
Gravity from RWST ,n L2, Window 1 Gravity from RWST in L2, POS 6 of Refuafrng Safety Valve Removed in Window 1 SV-W1 HR6~~ t6iWHEAD N.ECTION FLOW Fdlure to Diagnose Loss of RHR Event in POS 6 PATH D6-CG D-L8Wl-XHE A-L2W"i-XHE-G-10
F oilure of High Pressure Recirculation 1n Window 1 Failure of High Pressure Reoiroul at.ion d Safety Valve Removed in Window 1 CL2W1N4 SV-W1 INSUF FLOW FM INSL.f" FLOW FRM Failure lo Dia~se aikre of Recirculatio Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Evenl Spray in Window to Esloblish CHARG PUMP SUCT THE RECIR MODE in POS 6 1 High P Recirc HOR in Window 1 H1 H2 PL2W1-4 D-L2W1-XHE A-L2W1-XHE-C
- Failure of High Pressure Recirculation 1n Window 1 Failure of High Pressure Reoiroulation l dow Safety Vafle Removed in Window 1
CL2W1N8 SV-W1 JNSUF FLOW FM INSUF FLOW FRM Failure lo Diagnose ailure of Recirculatio LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window CHARG PUMP SUCT THE RECIR MODE in POS 6 1 HOR H1 H2 PL2Wl-8 D-L2Wl-XHE A-L2Wl-XHE-C-B
F 01lure of High Pressure Rec1rculot1on 1n Window 1 Failure of Hi&h Pressure Rcoiroul11.tion l CL2WlN13 INSUF FLOW FM INSl,f FLOW FRM FailLre lo Diag10se aiu-e of Recirculatio LPSI PMPS TO 3 CHRG PMPS IN Loss of R~ Event Spray in Window CHARG PU~ suer THE RECIR MOOE in POS 6 1 I-OR Hl H2 PU?Wl-13 D-L2W1-XHE A-L2Wl-XHE-C-13
Failure of High Pressure Recirculation 1n Window 1 F a:11 ure of High Pressure Rcoirouh.tion CL2W1N17 INSLJF FLOW FM INSLf" FLOW FRM Foihre lo Dioqiose oikie of Recirculatio LPSI PMPS TO 3 .CHRG PMPS IN Loss of R~ Event Spray in Window CHARG PUM' SUCT THE RECIR MOOE in POS 6 1 I-OR H1 H2 PL2Wl-17 D-L2Wl-XHE A-L2W1-XHE-C-17
['T1 A-UZW1-Xr£-C4 ~1-)(1£
~
(Yj
°' L' H'5 H'-SH.G r clJo.ro o1 Recrculollon Spr0f i, r""""'
VENTL12 Pl.2Wtl~ VW1 Pl..2WH
A-l:l.W1-Xf£-C-8 D-UW1-XI-E HA.SH..G Vont Exlots VENTL12
A-1..2W1-Xf£-<:-U D-l2.W1-Xl-£ [T1 I'.., L' 00 00 H'.S Hl.SIUl N~f't~~
'1/nbw 1 V£NTL T2 R.2.WMJ v.¥1 R.2WHJ
A-l2WI-X1£-C-17 IH.2W1-Xf£ Solely Val,,es u-o of Rl!crcuatlon Not Remove In Sf>""! In Wndow Window 1 1 VW1 R..2W1-17
Failure to Diag_nose Operator Failure Loss of RHR Event to Establish in POS 6 ; Recirculation S ra in W1 Pl2 1X4 D-L2W1-XHE A-L2W1-XHE-P-4 FAILURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATIO 'SPRAY RECIRCULATIO F2LPso* F1LPSD
Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W1 PL2 1X8 D-l2W1-XHE A-L2W1-XHE-P-8 FAILURE OF OUTSIDE . FAILURE OF INSIDE SPRAY RECIRCULATIO SPRAY RECIRCULATIO F2LPSD F1LPSD
Failure to Diag_nose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W1 PL2 1X13 D-L2W1-XHE A-L2W1-XHE-P-13 FAIL URE OF OUTSIDE . FAILURE OF INSIDE SPRAY RECIRCULATIO
- SPRAY RECIRCULATIO F2LPSD F1LPSD
Failure to Diag_nose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W1 PL2 1X17 D-L2W1-XHE A-L2W1-XHE-P-17 FAILURE OF OUTSIDE . FAILURE OF INSIDE SPRAY RECIRCULATIO SPRAY RECIRCULATIO F2LPSD F1LPSD
UNITY I12W2 RL2W2 VW2 NL2W2 SL2W2 FL2W2 GL2W2 CL2W2 SEQ # END-STATE-NA ES L2W2R6 -- LOSP L2, WINDOW W2, POS R6 1 @ z @ 3 4- CD 5 CD m 6 CD 7 '° .j:. 8 CD 9 CD 10 CD 11 @ 12 * @ 13 CD 14 CD 15 16 17 CD 18 CD
UNITY ILZWZ RL2W2 NL2W2
- SL2W2 FL2W2 CL2W2 SEQ #
- END-ST TI L2W206 - - LOSP L2, WINDOW W2, POS D tTl w 1
'-0 2 @ V1 3 @ 4 @ 5 CD 6 CD 7 @ 8 @ 9 CD 10 CD
top event for L2 LOSP L2 ,n window 2 IL211' 02 FR!Q-I.a IL2W OH p DURI.TION-R IQ POS-RIO FRAC-POSIO PROB-W3RIO POS-R6 PROB-TZRa OR-Mr [)t.Rt,.TION-0& PJIOB-W2DO
Restore RHR given L2 1n POS 6 Refueling Failure to Restor lo Diagno:! RHR alven 12 in LOSP Event in Loss of RHR OS 6 of Refuelin POSs 3-13 OS 6 of Refueling W3-S A-LZWZ-XHE-R-13 D-L2W2-XHE
Non-Recovery of AC Power 1n W2 NON-Recovery of AC Power in 2.62 HRS NRAC262
Reflux Cooling 1n window 2 folro lo DloQnoso RCS Locps lsokllod L099 of RHR £\lent t<> Cclu9e Foiltre 1n POS 8 o1 Reflux Cooli119 IS0-W2 D-L2W2-XBB INSLF fLOW TO SG FRM AT LEASf 1 AFW Pl.JIN' LSlfilJ A-Lewe-xm:-sr-J3 FALL.RE OF FALTO O.OSE FAILURE Cf" SECONDARY SIDE BOTH PORVS SECONDARY SIDE f£AT REMOVM. f-£AT REMCII/PI.. BSHlfaJ Pffil/1 A'-Lewe-XHE-81-13 A-Lewe-xHE-se-13
Reflux Cooling 1n window 2 RCS Loops lsololod to COU98 Foilurs of Roflux Coown<} 1SO-W2 D-L2W2-XBB A-L21V2-XUE-Sl'-J7 Operotor Failure FAURE CF FAlURE Cf" to Bleed !he SECONDARY SOE SECONDARY SIDE SGs I given L1 HEAT REMCW>L 1-EAf REMCW>L A-Lewe-XHE-62-17 A-L21f2-X!1E-S2-17
- Feed and Bleed the RCS 1n L2, Window 2 Feed Clld Bleed
!he RCS in L2, W"ndow 2 F~ Clld Bleed S<l!ety Vr:lJe
!he RCS In L2 Removed fn Window POS 6 of Refoolng 2 BY-W2 D-L2W2-XHE FALURE OF FEED A'-0 SPLL USN; LPI FSW12.
A -L~,V2-XHE-FL-C, A-L2W<I-XHB-FH-O
Feed and Bleed the RCS In L2, Window 2 Feed and Bleed the RCS in L2, W-111dow 2 Feed met Bleed Safety VONe the RCS in L2 Removed in Window POS B of Reruelng 2 ffV-lf2 Fcik.-o lo Dkmo3e Los* of RHR £vent In POS 6 D-L2W2-XHE f AU.RE OF FEED FALlft: OF FEED ANO SPLL USING MO SPll.. UStJG LPI HPl FSW12H A-Lawa-XHE-l'L-9 A-LZW2-XBB-PH-9
Feed and Bleed the RCS In L2 POS 6 of Refuefing Failure lo Diagnose Loss of R~ Event in POS 6 D-L2W2-XHE FALURE OF FEED FALL-RE OF FEED AflO SPILL USING AND SPLL USING LPI I-Pl FSW12L FSW121;l A-LZWZ-XHE-:rL-14 A-L2W2-XHE-FH Feed ond Bleed the RCS in L2 POS 6 of Refuefing Failure to Diagnose Loss of RI-R Event in POS 6 D-L2W2-XHE FAlURE OF FEED FAL~E OF FEED AM) SPILL USING AND SPLL USING LPI I-Pl FSW12L FSW12hl A-L2W2-XHE-FL-18 A-L2W2-XHE-FH-16
Gravity from RWST In L2, Window 2 Gravity from RWST in L2, POS 6 of Refuefing tI1 I *
.i,..
0 UI Safely Valve Removed in Window 2 SV-W2 INSUF FLOW Fd~re to Diagnose
~OUGH LOW t-£AD Loss of RHR Event N£CTION FLOW in POS 6 PATH D6-CG D-L2W2-XHE .A-L2W2-XHE-G-B
Gravity from RWST 1n L2, Window 2 Gravity from RWST in L2, POS 6 of Refueling Safety Valve Removed in Window 2 SV-W8 INSUF .FLOW Fd>Jre to Diagnose
~OUGH LOW !-£AD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D6-CG D-L8W8-XHE .A-L21Y'2-XHE-G-10
Failure of High . Pressure Rec1rculot1on 1n Window 2 Failure of High Pressure Reoiroul8.tion 2 tTl I .j:>,. 0 -..J Safety Valve Removed in Window 2 L2W2CPZM SV-W2 CL2W2N4 INSUF FLOW FM INSUF FLOW FRM Failll"e lo Diaq10se ailure of Recirculatio LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window CHARG PUMP SUCT THE RECIR MOOE in POS 6 2 HOR H1 H2 PL2'1\'2-4 D-L2'1f2-XHE A-L2'1\'2-XHE-C-4
F oilure of High Pressure Recirculation in Window 2 Failure of High Pressure Reoirouh.tion d t'I1. ~ 00 Safety Vaf./e Removed in Window 2 LZW2CPZM SV-W2 CL2W2N8 INSLf FLOW FM INSUF FLOW FRM Faihre lo Dia~ose oiure of Recirculatio Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of R~ vent Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR in Window 2 H1 H2 PL2W2-8 D-L2W2-XHE A-L2W2-XHE-C-8
Failure of High
- Pressure Recirculation in Window 2 Failure of High Pressure Reoiroulation L2W2CPZM CL2W2N13 INSUF FLOW FM INSL.f FLOW FRM Failu-e to Dia~se oiltre of Recircukitio Operotor Foilure LPSI P~S TO 3 CHRG PM'S IN Loss of RI-R vent Sproy in Window to Esloblish CHARG PU~ SUCT THE RECIR MODE in POS 6 2 High P Recirc HOR in Window 2 HI H2 -PL2W2-13 D-L2W2-XHE A-L2W2-XHE-C-13
Failure of High Pressure Recirculation in Window 2 Failure of High Pressure Reoirouln.tion m I .i:::,. 0 L2W2CPZM CL2W2N17 INSLf FLOW FM INSLf FLOW FRM Failtre lo Diaqiose aiu-e of Recirculatio Operator Foilure LPSI P~ TO 3 CHRG PM'S IN Loss of R~ Event Spray in Window to Esloblish Cl-!ARG PI.JM" SUCT THE RECIR MODE in POS 6 2 High P Recirc I-OR in Window 2 H1 H2 -PL2W2-17 D-L2W2-XHE A-L2W2-XHE-C-17
Foilure of Recirculation Spray 1n Window 2-couse HPR f oilure Failure or Reolroul ation Spray In loss of 1-PSH du to open contdrme L2W2CPZld CON-VFC-RP-COREM Fcilure to Dia<;11ose Loss of Rt-R Event in POS 6 D-L8W8-XHE A-L2W2-XHE-P-4. ALURE OF ovrsoE PRAY RECIRClUTK)N Ft.PSD F2LPSD
Foilure of Recirculation Spray in Window 2-cause HPR failure Failure or Reolroul 11.tion Spray In loss of 1-PSH du to open contdrme L2W2CPZM CON-VfC-RP-COREM Fo1ure to Diognose Operator F011ure Loss of Rt-ft Event to Establish in POS 6 Recirculation in W2 D-I.2W2-XHE A-L2W8-XHE-P-8 FAL~E OF N.50E AlURE OF OUTSOE
- Y RECRCUATION PRi\Y RECIRCUATION F't.PSD fa_pso
Foilure of Recirculation Spray Window 2-cause HPR failure Failura or Raolrouh.tion Spray In bss of 1-PSH d to cpen contcirvne L2W2CPZM CON-VfC-RP-COREM Failure to Diag,ose Loss of RHR Event in POS 6 D-LITTY"B-XHE A-L2W2-XHE-P-13 AlURE OF 01.JrSDE PRAY RECIRCLUTION F1.PSD F2LPS0
Foilure of Recirculation Spray 1n Window 2-cause HPR failure Failure or Reolroulation Spray In loss of 1-PSH d to open contcirme L2W2CPZ!d CON-VFC-RP-COREM f cilure to Diagnose Oper<itor f oilure Loss of RHR Event to Estabnsh in PCS 6 Recirculation in W2 D-LZW2-XHE A-L2W2-XHE-P-17 FALURE OF NSVE ALURE Of OVfSDE RAY RECRCLlATION PRAY RECIRCLLATK:lN ft..PSD F2LPSD
Correnotlon to Recirculation FTs (c and P) in Windo 2 ~- VI Operator Fa:llure FAILURE OF FEBO to Cross Connect A D SPILL USING H R ST Given success ul FSW12H D-L2W2-XHB A-L2W2-XHB-X
,i_.
A-L2W2-Xl£-C-4 D-l2W2-X1£ tTl .i,. ....a, HA.S Hl.SK.G VENTL12 Fl.2W2N4 W/2 R...2W2-4
A-l2W2.-Xl£--<:-8 D-l2W2-X1£ r....
-J Hl,S Hl,SH.G VENTL12 R.2W2Na W/2 fUW2-8
~s Vent. Exist* R..2W2-13
.t.-1.71¥2-Xl£-C-17 D--l.2W2-xt£ tT1
.I:.
'° L' H'.S 11'-SH.G
',£NT1..12 R..2W2Nfl Wl2 R..2W2-17
Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W2 PL2 2X4 D-L2W2-XHE A-L2W2-XHE-P-4 FALURE OF OUTSIDE FAILURE OF INSIDE PRAY RECIRCllATION PRAY RECIRCu.ATION F2LPS0 F1LPSD
Failure to Diagnose Operator Failure m Loss of RHR Event to Establish j:.. N ...... in POS 6 Recirculation S ra in W2 PL2 2X8 D-L2W2-XHE A--L2W2-XHE -P-8 FALURE OF OUTSIDE FAIL URE OF INSIDE PRAY RECIRCu..ATION PRAY RECIRCu..ATION F2LPSD F1LPSD
Failure to Diagnose Loss of RHR Event in POS 6 PL2 2X13 D-L2W2-XHE A-L2W2-XHE -P-13 FALURE OF OUTSIDE FAIL URE OF INSIDE PRAY RECIRCLUTION PRAY RECIRCLUTION F2LPSD F1LPSD
Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation S ra in W2 PL2 2X17 D-L2W2-XHE A-L2W2-XHE-P-17 FALURE OF OUTSIDE FAILURE OF INSIDE PRAY RECIRCll_ATION PRAY RECIRCu..ATION F2LPSD F1LPSD
UNITY IL2W3 RL2W3 VW3 NL2W3 FL2W3 GL2W3 SEQ # END-STATE-NAMES L2W3R6 -- LOSP L2, WINDOW W3, POS R6 1 @ 2 @ 3 4- CD 5 CD 6 @ 7 CD 8 CD 9 10 CD 11 @ 12 CD
UNITY IL2W3 RL2W3 NL2W3
- SL2W3 FL2W3
- SEQ #
- END-STA TE-NAME L2W306 -- LOSP L2, WINDOW W3, POS 6 1 @
2 @ 3 @ 4 @ 5 CD 6 @ 7 @ 8 CD
UNITY IL2W3 RL2W3 VW3 NL2W3 FL2W3 GL2W3 SEQ # END-STATE-NAMES L2W3R 10 - - LOSP L2, WINDOW W3, POS 10 1 @> 2 @> 3 @> 4 CD 5 CD 6 @> 7 CD 8 CD 9 @ 10 CD 11 @ 12 CD
top event for L2 LOSP L2 1n window 3 ILiW Oll PRBQ-L2 IL211' OH p DURATION-RIO POS--RIO FRAC-POSIO PROB-\of3R10 [)t.JAATDN-fl6 H0D-T3RB PROB-W:ma
Restore RHR given L2 in POS 6 Refueling Failure to Restor ailure lo Diagno~ RHR Elven L2 ln LOSP Event in Loss of RHR OS 6 of Refuelin OS 6 of Refueling POSs 3-13 W3-S A-L2W3-XHE:-R-4 D-L2W3-XHE
Sof ety Not Removed ,n Window 3 Safety Valves Not
- Removed in Window 3 OS 6 of a Drained Maintenance Outage VW G7 POS-D6 OS 6 of a Refueling POS 10 of a Outage Refueling Outage VW G4 P0S-R6 P0S-R10 Pressurizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
Non-Recovery of AC Power-Non-Recovery of AC Power in 3.48 HRS NRAC346
Reflux Cooling window 3 RCS Loop* Isolated to CoU9e Foltre of R~flux Cooir19 D-L2l'f9-XB8 INSlF fLOW TO SG FRM AT LEAST 1 AfW P1.M' A-L211'3-XHE-SP-!! FAL TO CLOSE BOTH POR\IS 8SHll'i!3 Pffi\/1 BSHIT23 A-L2W3-XH!!-S1-!! A-L21'1'3-XHB-SZ-!!
Reflux Cooling 1n window 3 Fcfuro lo DioQooso RCS Loops Isolated L099 of RHR E:vent to Call9e Faltre i'l POS 6 of Rcfm CooinQ D-L2W9-J:B8 INSlF FLOW TO SG FRI.I AT LE'AST 1 f.fW PU.f' A-LC'll'3-XBE-Bf-B FALLRE Cf° FALTO CLOSE FALURE CF SECOIIJARV SOE BOTH PORVS SECONDARY SIDE HEAT REMO/ill. !-£AT REI.IOJill. BSHlT23 BSHlT23
. A-L2W3-XHE-S1-8 A-L2W3-J:HB-S2-8
- Feed and Bleed the . RCS L2, Window 3
- Feed and Bleed the RCS In L2, W-,ndow 3 Feed and Blod Sol&ly V<:M!
the RCS In L2 Removed In Window J BY-1f3 Fafl\ro lo Dlo<r>oso Loss of RIR C vent D-L2W3-XBE f AU.ft: <<' FEED FAL~ <<' FEED MO SPI.L USNG Ml> SPl.l. USN:l LPI 1-PJ A-L2W3-Xlll!:-P'L--l A-l.2W3-:UIB-Fl£--4
Feed and Bleed the RCS 1n L2, Window 3 reed clld Bleed the RCS In L2, W-ndow 3 FOO<l clld Bkl~ Soloty V<:he the RCS In L2 Rem<Ned In Wfrdow 3 l!V-'lf3 D-L2W3-XHE rALl.flE a' FEED AIO SPU USN<l LPI FSW12L A-L2W3-IBB-PH-7
Feed and Bleed the RCS L2, Window 3 Fll&d and Bkloo the RCS In L2 D-L2W3-XHE f ALURf OF FEED NO SPLL USU: LPI FSW34L A-L~3-XBE-PL-10 A-L2lf3-ll:H!-l"H-10
Feed and Bleed the RCS 1n L2, Window 3 fe&d a,d 61800 the RCS In L2 Falso lo Dloonoso Loss of RHR £vent D-L2W3-XBE rAL'-"E Cf' FEED MO SPLL USING LPI l"S11'34L
- A-L.:W3-XHE-PL-le A-L2Yl3-XH!-FH-13
Gravity from RWST ,n L2, Window 3 Gravity from RWST in L2, Safety Valve Removed in Window 3 SV-W3 INSlf" FLOW Fa~re to Diagnose OUGH LOW 1-£AD Loss of RHR Event NJ:CTION FLOW PATH 00-CG D-L2W3-XHE A-I..2W3-XHE-G-Ei
Gravity from RWST 1n L2, Window 3 Gravity from tRWST in L2, Safety Valve Removed in Window 3 SV-W3 INSLf" FLOW F<ik.Jre to Diagnose t-fiOUGH LOW 1-£AD Loss of RHR Event N.ECTION FLOW PATH D6-CG D-L2W3-XHB A-L2W3-XHE-G-B
IL2W4 RL2W4 VW4 NL2W4 FL2W4 SEQ # END-STATE-NAMES L2W4R6 -- LOSP L2, WINDOW W4, POS 6 1 2 @ 3 @ 4 OK 5 CD 6 @ 7 OK 8 CD 9 @ 10 CD 11 @ 12 CD
UNITY IL2W4 RL2W4 NL2W4 SL2W4 FL2W4 SEQ # END-STATE-NAME L2W406 -- LOSP L2, WINDOW W4, POS 6 1 @ 2 @ 3 @ 4 @ 5 CD 6 @ 7 @ 8 CD
- I UNITY I IL2W4 I RL2W4- I VW4 I NL2W4 I FL2W4 I GL2W4 I SEQ # END-STATE-NAMES L2W4R10 -- LOSP L2, WINDOW W4, POS ~10 1
2 @ I 3 I 4- OK 5 CD 6 @ m I 7 OK t I 8 CD 9 @ 10 CD 11 @ 12 CD
top event for L2 LOSP L2 In window 4 ILlll' OR PRBQ-La IL21' OH p OORATION-RlO REFV!!. POS-RlO FRAC-POSIO PROB-1'1810 POS-R6 PROB-"ll'~RS DIHIT Dt.R>.TION-D~ PR0B-1f4D5
Restore RHR given L2 1n POS 6 Refueling Failure to Restor ailure lo Diagnos RHR given 12 in LOSP Event in Loss of RHR OS B of Refuelin . PDSs 3-13 OS 6 of Refueling W3-S A-LZW4-XHE-R-5 D-L2W4-XHE
Non-Recovery of AC Power Non-Recovery of AC Power in 4-.55 HRS NRAC4-55
Reflux Cooling window 4 Faikro lo DioQooso RCS Loq,s Isolated . Lo99 or RHR £vent to CoU9e Fcitre i1 POS 6 of Reflux Cooing D-L2W-l-XHE INSlF FLOW TO SG FRI.I AT LEAST 1 AfW PUMP LSlH A-L21f-l-XBB-SF-5 FALLRE OF FAL TO QOSE FALURE Cf" SECc>>oARY SOE BOTH PORVS SECONDARY SIDE HEAT REMO-I.AL !-£AT REM(1..I.AL SSIIYI-' POOV1 SSBIU
'A-L2'ir-i-XBE-BJ-O
Reflux Cooling window 4 Foikre lo Dk,q nose RCS Locps Isolated L099 or RHR £vent to Cou9e Fdhre ln POS 6 of Reflux CoolinQ tT1 t 0\ LSlT-' A-te1n-xes-sr-a Operator Foll.re FALLRE CF FALTO CLOSE FALUlE Cl' to Bleed the SECOI-OARY SIDE BOTH PORVS SECO'°ARY SIDE SGs 1 ,j,en L2 HEAT REMW,61. f-£AT REMCW.AL ssew.i PCR\/1 SSBW-' A-L21'1'-'-J:BE-BJ-B A-L2W -i-XHE-se-6
Feed and Bleed the RCS 1n L2, Window 4 r e&d and Bleed the RCS In L2, W-ndow 4 F00<! Old Blee.I S0f9ty Vowe the RCS In L2 Removed In Window 4 Fdkro lo Dkmoso Loss of RHR £vent D-L2W~-XHE rAU.RE Of FEED FALIH: Of FEED ANO SPU USN: ANO SPU USN:l LPI l-f'1 rswia. FSW12H
Feed and Bleed the RCS In L2, Window 4 Feed ond Bleed the RCS rn L:2, W"ndow 4 Fee<l and Bleoo Saf~ty Yd.le the RCS In L2 Removed rn Window 4 Falso lo D!o<r,o30 Loss of Rl-R £vont 1>-L2Wi-XHB FSW12. A-L2W4-XBB-PL-B
Feed and Bleed the RCS
** L2, Window 4 feed ood Bleed the RCS In L2 folkro to DiooMse Loss or Rffi £vent D-L2W4c-XHE f AL'-'lf Of FEED fALLm: Of FEED AMl SPLL USING Mll ~ USNG LPI FSW34L FS1r34H A-UWI-XHB-FI.-10 A-LZlH-Xm:-rH-10
Feed and Bleed the RCS L2, Window 4 Fe&d and B!e&d the RCS In L2 tT1 ~ 0 Folio.re lo Dkmoso Loss of mR Cven.t D-L2Wl-XHE FALUlE Of FEED
/I.Ill SPU. USNG HP1 FS1\'34L l"S11'34H A-L2W4-XHl!-n.-12 A-LZlf-&-XIIE-FH-12
Gravity from RWST L2, Window 4 Gravity from RWST in L2 Safely Valve Removed in Window 4-sv-w.i INSLF FLOW Fd~re to Diagnose OUGH LOW t-£AD Loss of RHR Event Nl:CTION FLOW PATH D6-CG D-Law.i-xm:
Gravity from RWST L2, Window 4 Gravity from RWST in L2 m ~ N Safely Valve Removed in Window
+
INSLf' FLOW Fd~re to Diagnose J-fiOUGH. LOW !-£AD Loss of RHR Event N.ECTION FLOW PATH D6-CG D-LBW-i-xm: A-L2W-'-XHE-G-8
Appendix E.8 Event Trees and High Level Fault Trees for Unit 1 B1ackout(L3) E-453
UNITY IL3W1 RL3W1 VW1 NL3W 1 SL3W 1 FL3W 1 GL3W 1 CL3W 1 SEQ # END-STATE- A~ L3W 1R6 -- LOSP L3, WINDOW W1, POS R6 1 @ 2 3 4- CD 5 CD 6 CD 7 @ 8 CD g CD m .;,. 10 CD Vl @ .i:,. 11 12 @ 13 CD 14 CD 15 16 17 CD 18 CD
UNITY IL3W1 RL3W1 NL3W1 CL3W1 SEQ # END-ST TE L3W1D6 -- LOSP L3, WINDOW W1, POS D6 1 @ 2 @ 3 @ 4 CD 5 CD 6 @ 7 CD 8 CD
top event for L3 LOSP L3 window 1 IL3!1' o; FRBQ-L3 IL311' 014 Dlm.TION-R10 REF\J!l. POS-R10 FR'-C-POS10 PRC8-WR10 DR-MT PROB-W"Ofl
Restore RHR given L3 1n POS 6 Refueling Failure to Restor Failure lo Diagnos RHR given 13 in LOSP Event in Loss of RHR OS 6 of Refuelin POSs 3-13 OS 6 of Refueling A-L3W 1-XHE-CW W3-S A-L3Wl-XHE-R D-L3W1-XHE
Non-Recovery of AC Power 1n 144 min. of LOOP Non-Recovery of AC Power in 2.00 HRS NRACZOO
Reflux Cooling ,n window 1 Fclu-e lo llloonoso RCS Loops Isolated L09S or RHR Event 1o Cause FailtJ"G
~ POS 6 of Reflux Cooing D-L3ll'1-XHE INSI.F FLOW TO SG FRM AT LEAST 1 AfW PU.4P A-L3'1iJ-XHB-SF-i3 FALTO a.OSE FALi.RE Cf" BOTH POR\IS 5ECOIOARY SIDE I-EAT REl,l<M6L SSHWI SSHNI A-L311'1-XBB-B1-i3 A-L311'1-XBB-B2-13
Reflux Cooling 1n window 1 RCS Locps Isolated to C<lU9e Falire of Rofk.o< Cooing 190-WI D-L3ll'1-:XHE INSl..f" rLOW TO SG FRM AT LEAST 1 /.fW PUMP l..5W1 SRJ 1GJ A-L31VJ-J:HB-SF-17 FAURE CF FALTO Q.OSE FAI..URE CF SECONDARY SOE BOTH PORVS SECOIOARV SIDE HEAT REMOJ>L I-EAT REMav>L SSl-ltVI A-L31rl-XB8-SJ-J7 A-L31f1-XB8-82-17
Feed and Bleed the RCS 1n L3, Window 1 Feed and Bleed the RCS In L3, Wn<low I Feoo Clld BJQ~d Sol~ty VCRJe the RCS In LJ Remc:Ned In Wiooow POS 6 of Reruelng 1 S\/-W1 D-L3Wl-XHE FALIJRE Of FEED AUl SPLL USING LPI A-LJ'll'l-XBB-CW-(5 FSWta. FSW12H A-LJW l-J:BB-PL-11 A-L3Wl-XH!!-FB-O
Feed and Bleed the RCS L3, Window 1 Feed and Bleed tM RCS In LJ, Wndow I Food cm 61eed Solely Val,/8 the RCS In LJ Removed In Window POS 6 ot Reruelng 1 SV-W1 Folkr6 lo Dkionoso Loss of R~ [vent In POS 6 D-L3Wl-XHE f AL\.flE Of FEED FAL!n Of FEED MO SPLL USNG MO SPlL USNl LPI l-f'1 A-L3'1fl-XBB-CW-9 FSW12... FSW12H A-LJWl-XHE-FB-9 A-LJWl-J:BB-PL-9
Feed ond Bleed the RCS in L31 POS 6 of Refueling Faih..re to Diagnose Loss of RHR Event in POS 6 D-L3Wl-XHE FALURE OF FEED FALURE OF FEED MO SPLL USING At--l) SPLL USING LPI HPI A-13W1-XHE-CW-14 FSW12l FSW12H A-L3W1-XHE-FL-14. A-L3W 1-XHE-FH-14
Feed end Bleed the RCS in L3 POS 6 of Refue~ng Faih.re to Diagnose Loss of RHR Event in POS 6 D-L3W1-XHE FALURE OF FEED FALURE OF FEED Operator Faik.re 00 SPLL USING At-0 SPLL USING to use HHSI in LPI HPI feed and spil In Window 1
.A.-L3W1-XHE-CW-1B FSW12L FSW12H
.A.-L3W'1-XHE-FL-10 .A.-L3W1-XHE-FH-1B
Gravity from RWST L3, Window 1 Gravity from RWST in LJ, POS 6 of Refuafing Safety Valve Removed in Window 1 INSLf FLOW Fci~re lo Diagnose
!-'ROUGH LOW H:AD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D6-CG D-L3W1-XHE A-L3W1-XH!:-G-6
Gravity from RWST L3, Window 1 Gravity from RWST in L3, POS 6 of Refueflng Safely Valve Removed in Window 1 SV-W1 INSLf FLOW Fdk.Jre to Diagnose OUGH LOW 1-'EAD Loss of RHR Event Nf:CTION FLOW in POS 6 PATH D6-CG D-L3W1-XHE A-L3W-1-XHE-G-10
Failure of High Pressure Rec1 rcu lat1 on 1n Window 1 Failure of High Pressure Reoiroula.tion n 1 do Safety Valve Removed in Window 1 CL3W1N4 SV-W1 INSUF FLOW FM INSlf FLOW FRM Failure to Dia~se ailu-e of ~ecirculatio Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR vent Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 1 High P Recirc HOR in Window 1 H1 H2 PL3W1-4 D-L3W1-XHE A-L3W1-XHE-C-4.
F 01lure of High Pressure Rec1rculat1on
,n Window 1 Failure of High Pressura Reoirouh.t.ion t
Safety Valve Removed in Window 1 CL3W1NB SV-Wl INSUF FLOW FM INSUF FLOW FRM Faihie to Diagnose aillre of Recirculatio Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RI-R Event Spray in Window to Establish CHARG PUMP suer THE RECIR MODE in POS 6 1 High P Recirc HOR in Window 1 H1 H2 PL3Wl-B D-L3W1-XHE A-L3W1-XHE-C-B
Failure of High Pressure Recirculation 1n Window 1 l' ailure of Hlith Pressure Reoiroulation CL3W1N13 INSLf FLOW FM INSl,f FLOW FRM Failure to Diaqwse oikre of Recirculotio LPSI Pf.PS TO 3 CHRG PM'S IN Loss of Rf-R Event Sproy in Window CHARG PUMP Sl.JCT THE RECIR MODE in POS 6 1 I-OR
- HI H2 *PL3W1-13 D-L3W1-XHE A-L3W1-XHE-C-13
F oilure of High Pressure Recirculation 1n Window 1 Failure of High Pressure Reoiroul 11.tion CL3W1N17 INSl.f" FLOW FM INSl.f" FLOW FRM Foiltre to Dioq)Ose oiu-e of Recirculotio LPSI Pt.PS TO 3 CHRG Pt.PS IN loss of RI-R Event Sproy in Window CHARG PUM" SUCT THE RECIR MODE in POS 6 1 I-OR H1 H2 -PL3Wl-17 D-L3W1-XHE A-L3W1-XHE-C-17
t'I1 A-1.:JIIU-XJ-£-C-4 IH.:M1-XI£ ~ L' HbS VElffi.12 Pl.3Wt# VW1 Pl3Wl-4
m -'-l3WHO£-C-8 D--l.3W1-X1£ ~ t-,J H'.S tl'.SH.G Ven!. E:xJ,,t,,
\£Nlt.12 PL:,,n.a VW1 Pl.3W1-8
D-Ll'lt'I->>£ r
- of Roct-eoot'on Spray i, ~
W-1 PLlW1-1J
m A-UW1-Xt£-<H7 D-{.J,ot1-l<t£ ~ .i,.. LI HOS ~SH.G VElm..12 PLJWtm VW1 PL3W1-17
Failure to Diagnose Operator Faih.re OPERATOR FALS Loss of RHR Event to Estcbfish TO ISQATE THE in POS 6 Recirculation CANA.L.. IN L3 r in W1 D-L3W1-XHE A-L3W1-XHE-P-4 A-l3W1-XI-E-CW-4 FALLRE OF INSDE FAL URE OF OUTS OE SPRAY RECIRCllATIO SPRAY RECIRCllATIO F1.P$0 F2LPSD
Failure lo Diagnose Operator Foih.re OPERATOR FAILS Loss of RHR Event to Estobfish TO !Sa.ATE THE in POS 6 Recirculation CANAL IN L.3 S ro in W1 D-L3W1-XHE A-L3W1-Xf-£-P-8. A-L3W1-XHE-CW-4 FAL~E OF INSIDE FALURE OF OUTSI SPRAY RECIRCLlATIO SPRAY RECIRCll.ATIO ft.PSO F2LPSO
Failure to Diagnose OPERATOR FALS Loss of RHR Event TO !Sa.ATE THE in POS 6 CAl'W. IN L3 D-L3W1-XHE A-L3W1-XHE-P-13 A-l3W1-XI-E--CW-4 FALL.RE OF INSDE FALURE OF OUTSOE SPRAY RECIRCu.ATIO SPRAY RECIRCu.ATIO F1LPSIY' F2LPSO
Failure to Diaqnose Operator Foilu-e OPERATOR FAILS Loss of RHR Event to Estabfish TO !Sa.ATE THE in POS 6 Recirculation CANAL IN L3 S ra in W1 D-L3W1-XHE A-L3W1-XHE-P-17. A-L3W1-XHE-CW-4 FALLRE OF INSIDE FALURE OF OUTS! SPRAY RECIRCLl.ATIO SPRAY RECIRCLLA.TIO flLPSO F2LPSO
- 1 UNITY I I13W2 I RL3W2 I VW2 I NL3W2 I SL3W2 I FL3W2 I GL3W2 I CL3W2 I SEQ #
END-STATE-NA1 ES L3W2R6 -- LOSP L3, WINDOW W2, POS R6 1 2 @ 3 @ I 4 CD I 5 CD 6 CD 7 I 8 CD I 9 CD 10 CD 11 @ I 12 @ I I 13 CD I 14 CD 15 @ I 16 @ I I 17 CD I 18 CD
UNITY IL3W2 RL3W2 NL3W2 SL3W2 FL3W2 CL3W2 SEQ # END-ST TI L3W2D6 - - LOSP L3, WINDOW W2, POS D m @ J::.. 1 ~ 2 @ 3 @ 4- @ 5 CD 6 CD 7 @ 8 @ 9 CD 10 CD
top event for L3 LOSP L3 window 2 IL31! a; FRBQ-L3 tr1 .l:. 00 JL3W au p DUAATION-R IQ REF\lO.. POS-RIQ FRAC-POSIQ PROB-Wli!R10 DJRATION-R6 PROB-T~RG DR-IIT DlRATIOH-D& PR0B-lf2DS
Restore RHR given L3 1n POS 6 Refueling Failure to Restor ailure to Diagnos RHR given 13 in LOSP Event in Loss of RHR POSs 3-13 OS B of Refuelin OS 6 of Refueling A-L3W2-XHE-CW-4 W3-S A-L3W2-XHE-R-4 D-L3W2-XHE
Non-Recovery of AC Power 1n W2 NON-Recovery of AC Power in 2.62 HRS NRAC262
Reflux Cooling window 2 RCS Locps Isolated to Couse Fo'iure of Rcfk.Jx Coo[ng 1SO-W2 D-L3W2-XHB INSLf FLOW TO SG FRM AT LEAST 1 MW PUAP LSlfilJ A-L3W2-XHE-BF-J3 FALLRE OF FAL TO a..osE FALURE Cf SECD'°ARY SIDE BOTH PORIS SECONDARY SIDE 1£AT REMOVft!.. I-EAT REMOVM.. PORV1 BSHlfaJ A-L3W2-:XH!:-B1-l3 A-L3lfe-xtre-S2-13
Reflux Cooling 1n window 2 RCS Loops Isolated to Couse Fa'iure of Rof!.Jx Coonng ISO-W~ D-L3W2-X88 INSlF FLOW TO SG FRl.4 AT LEAST 1 AfW PU.if' LSlf23 A-L311'2-XHE-SF-J7 FAURE OF FAILURE OF SECO'°ARY SOE :sECONOARY SIDE f£AT REl.40\IM. f-£AT REl.40/M. BSHIT23 PORV1 BSHIT23 A-L3'1V2-XIIE-81-l7 A-LJ'lre-Xl!E-Se-17
Feed and Bleed the RCS L3, Window 2 Feed and Bleed 1M RCS In L2, Winoow 2 Feed and Bleed Sol~ty Vowe the RCS In L3 Removed In Window POS 6 of Refuelng 2 Fml.ro lo Dloonoso Loss of RHR Event In POS 6 D-L3W2-XBB FALURE Of FEED
/1.1-0 SPLL USNG I-Pl A-L31fa-JCHE-Clf-5 FSW1a. FSW12H A-L3We-xm:-F'L-O A-1.311'.l-XBB-PH-I)
Feed and Bleed the RCS L3, Window 2 Feed and Bleed thew~Jnl2, feed cJ'ld Bleed . Safety Vatve the RCS In LJ Removed In Window POS 6 of Reruelng 2 Fau-o to Dkxnos~ Loss of RHR Event In POS 6 D-L3W2-XBB rALURE Of FEED ANO SPLL USING LPI A-L31f2-Xl!E-C'lf-9 FSW12H A-L3Tt'2-XHE-FL-9 A-L3wa-XHB-PH-9
Feed and Bleed the RCS in L3, POS 6 of Refueling FoilU"e to Diagnose Loss of RHR Event in POS 6 D-L3WZ-XHE FAlURE OF FEED FAl~E OF FEED ND SPU. USING AND SPLL UStlG LPI I-Pl A-L3W2-XHE-CW-14 FSW12l FSW12H A-L3W2-XHE-FL Feed and Bleed the RCS in L.31 POS 6 of Refueling Foih.re to Diagnose Loss of RHR Event in POS 6 D-L3W2-XHE FALURE OF FEED FALURE OF FEED AN) SPlL USING At,.D SPLL USING LPI HPI A-13W2-XHE-CW-18 FSW12l FSW12H .A.-L3W2-XHE-FL-18 .A.-L3W2-XHE-FH-18
Gravity from RWST ,n L3, Window 2 Gravity from RWST in L3, POS 6 of Refuefing Safety Valve Removed in Window 2 SV-W2 INSLf' FLOW F<i~re to Diogoose OUGH LOW HEAD Loss of RHR Event N£CTION FLOW in POS 6 PATH D6-CG D-L3W2-XHE A-L3W2-XHE-G-B
Gravity from RWST 1n L3, Window 2 Gravity from RWST in L3, POS 6 of Refuaring Safety Valve Removed in Window 2 SV-W2 INSLf FLOW F<i~re to Diagnose
~OUGH LOW t-£AD Loss of RHR Event NJ:CTION FLOW in POS 6 PATH D6-CG D-L3W2-XHE A-L3W2-XH!:-G-1D
F oilure of High
- Pressure Recirculation In Window 2 Failure of High Pressure Reoiroule.tion 1
Safety Vatve Removed in Window 2 L3W2CPZM SV-W2 CL3W2N4 INSUF FLOW FM INSUF FLOW FRM Failure to Diagi<,se oilure of Recirculotio LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Evenl Spray in Window CHARG PUMP SUCT THE RECIR MODE in POS 6 2 HDR H1 H2 PL3W2-4 D-L3WZ-XHE A-L3WZ-XHE-C-4
F oilure of High Pressure Recirculation 1n Window 2
- Failure of HIEh Pressure Reoirouh.t.ion L3W2CPZM CL3W2N13 INSLf FLOW FM INSLf FLOW FRM Foili.re lo Dia~se oilre of R'ecirculotio Operator Foilure LPSI PMPS TO 3 CHRG PWS IN Loss of RHR vent Spray in Window to Establish CHARG PUW SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR in Window 2 H1 H2 *PL3W2-13 D-L3W2-XHE A-L3W2-XHE-C-13
Failure of High Pressure Recirculation in Window 2 Failure of High Pressure Reoiroulat.ion do Safety Vowe Removed in Window 2 L3W2CPZM CL3W2NB SV-W2 INSUF FLOW FM INSL.f FLOW FRM Foihre lo Diag10se oikre of Recirculotio LPSI PMPS TO 3 CHRG PMPS IN Loss of RI-R Evenl Spray in Window CHARG PUMP SUCT Tf:lE RECIR MODE in POS 6 2 HOR H1 H2 PL3W2-B D-L3W2-XHE A-L3W2-XHE-C-B
Failure of High . Pressure Recirculation Window 2 Failure of High Preusuro Rccirouh.lion L3lV"ZCPZM CL3lV"2N17 INSL.f FLOW FM INSL.f FLOW FRM Faihre to Dia~se oiu-e of Recirculotio Operator Foilure LPSI PM'S TO 3 CHRG PMPS IN Loss of Rf-ft vent Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc I-OR in Window 2 HI H2 *PL3WZ-17 D-L3W2-XHE A-L3W2-XHE-C-17
Foilure of Recirculation Spray in Window 2-cause HPR failure Failure of Reolroulation Spray In loss of HPSH du to open contoinme L3W2CPZM CON-VfC-RP-COREM f a1ure to Diagiose Operator fa1ure Loss of RHR Event to Estabf~h in POS 6 Recirculation in W2 o-I.3Wa-xm: A-L3W2-XHE-P-4. FAL~E OF NSDE ALURE Of OVTSDE RAY RECRCUATION PRAY RECIRCULATK)N Ft.PSD F~SD
Failure of Recirculation Spray in Window 2-couse HPR failure FailUI'e or Reolroulation Spray In loss of 1-PSH du to open contcirvne L3W2CPZM CON-VfC-RP-COREM Fcilure to Diag,ose Loss of R~ Event in POS 6 D-L3WB-XHE A-L3W2-XHE-P-8 ALURE OF oursOE PRAY RECIRCLlATION F2LPS0
F oilure of Recirculation Spray 1n Window 2-cause HPR failure Failuxe of Reolrouhtion Spray In loss of tf>SH d to open contcirme L3W2CPZM CON-VFC-RP-COREM Falure to Diogiose Oper<ltor Falure Loss of Rt-R Event to Estabrish in POS 6 Recirculation in W2 D-L:JWia-XHE A-L3W2-XHE-P-13 FALVRE OF NSDE ALURE OF OVfSIOE Y RECRCLlATION PRAY RECIRCLlATK>N Ft.PSD F2LPSO
- Foilure of Recirculation Spray in Window 2-couse HPR f oilure Fail\ll"<l of Rcolroulation Spray In loss of HPSH du to open contdnme L3W2CPZM CON-VfC-RP-COREM Falure to Diag,ose Loss of RI--R Event in POS 6 D-L3W8-XHE A-L3W2-XHE-P-17 FAL~E Of NSDE ALURE OF OUfSDE Y RECRCUATION PRAY RECIRCULATKJN F1..PSD F2LPS0
Correnotlon to Recirculation FTs (C and P) in Windo 2 m 0 0 Operator Failure FAILURE OF FEED to Croaa Connect A D SPILL USING H R ST Given success ul FSW12H D-L3W2-XHE A-L3W2-XHE-X
m ..:,. A-l.JW2-Xl£-C-4 IH..3,lt2-)0£ 0 H'.S 11'.SH..G
',f}ffi.12 R.:J!\'2m Wl2 R.3'N2-4
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\.91!1.12 R..3W2N17 W/2 R..3W2-17
Failure to Diaqnose Operator Failu-e OPERATOR FAILS Loss of RHR Event to Estabflsh TO ISCLA.TE THE in POS 6 Recirculation CANAL IN L3 m S ra in W2 V, 0 V, D-L3W2-XHE A-L3W2-XHE-P-4. A-L3W2-XHE-CW-4 FALL.RE OF INSIDE FALURE OF OUTSI SPRA.Y RECIRCL!ATIO SPRAY RECIRCu.ATIO
*Ft.PSD F2LPSD
Failure lo Diaqnose OPERATOR FAILS Loss of RHR Event TO 1Sa.ATE THE in POS 6 CANAL IN L3 D-L3W2-XHE A-L3W2-XHE-P-8. A-L3W2-XHE-CW-4 FALLRE OF INSIDE FA LURE OF OUTS! SPRA.Y RECIRCUATIO SPRAY RECIRCLlATIO
*...Ft.PSD F2LPSO
Failure to Diaqnose Operator FailLre OPERATOR FAILS Loss of RHR Event to Establish TO ISQA.TE THE in POS 6 Recirculation CANAL IN L3 S ro in W2 D-L3W2-XHE A-L.3W2-XHE-P-13. A-L3W2-XHE-CW-4 FALL.RE OF INSIDE FA LURE OF OUTSI SPRAY RECIRCLLATIO SPRAY RECIRCLlATIO
*fl.PS[) F2LPSD
m v. 0 Failure to Diagnose OPERATOR FALS 00 Loss of Rt-R Event TO ISOLATE THE in POS 6 CANA.L IN L3 D-L3W2-XHE A-L.3W2-XHE-P-17 A-L3W2-XHE-CW-4 FAILI..RE OF INSOE FALURE OF OUTSICE SPRAY RECIRCu.ATIO SPRAY RECIRCu.ATIO FLPSD F2LPSD
- I UNITY I I13W3 I RL3W3 I VW3 I NL3W3 I FL3W3 I GL3W3 I SEQ # END-STATE-NAMES L3W3R6 -- LOSP L3, WINDOW W3, POS R6 1 @
2 @ 3 @ I I 4- CD 5 CD 6 @ m I V, I 7 CD 0 8 CD "° 9 @ 10 CD 11 @ 12 CD
UNITY IL3W3 RL3W3 NL3W3 SL3W3 FL3W3 SEQ # END-STATE-NAME L3W306 - - LOSP L3, WINDOW W3, POS 6 m. u, @ .... 1 0 2 @ 3 @ 4 5 CD 6 7 8 CD
UNITY 113W3 RL3W3 VW3 NL3W3 FL3W3 SEQ # END-STATE-NAMES L3W3R10 -- LOSP L3, WINDOW W3, POS 10 1 @> 2 @> 3 @ 4 CD 5 CD 6 @ 7 CD 8 CD 9 @ 10 CD 11 @ 12 CD
top event for L3 LOSP L3 1n window 3 IL3!1' 02 1BIQ-L3 tTl ....N IL3W 014 OURATON-R IQ REF\JO. POS-RIO fRAC-POSIQ PROS-W3RIO POS-R6 PR0B-'l'3R8 Pl10B-W3D5
Restore RHR given 13 1n POS 6 Refueling Failure to Restor Failure to Diagnos RHR glven L3 ln LOSP Event in Loss of RHR OS 6 of Refuelin OS 6 of Refueling PDSs 3-13 A-L3W3-XHE-CW-4 W3-S A-L3W3-XHB-R-4 D-L3W3-XHE
Non-Recovery of AC Power NL W3 Non-Recovery of AC Power in 3.48 HRS NRAC346
Reflux Cooling window 3 Foikre lo Dioqnose RCS Loq,s lsokiled Lo99 or RHR E:ven1 10 CoU9e Failtre in POS 6 of Rof~x CcclnQ tT1 vi Vl IBD-W3 D-L3WS-XBB INSLf" FLOW TO SG FRM AT LEAST 1 AfW P\M LS1f2:J A-L31'1'3-XHE-SP-~ FALLRE CF FALTO CLOSE FAllUlE Cf SECOMJARY SOE BOTH PORVS SECOI-OARY SIDE f£AT REMCV.AL l-£AT REMCW.AL BSHlfZ3 Pffil/1 BSHlf23 A-LSW3-XHE-S1-~ A-L3W3-XHB-S2-~
Reflux Cooling window 3 RCS Locps Isolated 10 Cou9e Fon...-e of Refm Cooing D-L3W3-XBB INSLf" FLOW TO SG FRM AT LEAST 1 MW PUMP LSIT.!3 A-L31f3-XHE-SP-6 FALTO QOSE FAl\JlE Cf BOTH PORVS !:ECONOARY SIDE l-£AT REMCW.ol.. BSHIT23 A-L3W3-XHE-l!i-6 A-L3W3-XHB-S2-8
Feed and Bleed the RCS 1n L3, Window 3 Feed and Blood the RCS In L2, Wndow 3 Foo<! and B!Gtd Sal~ty vwe the RCS In L3 Removed In Window J D-L3W3-XHE f All.RE OF FEED FALl.RE Of FEED ANO SPLL USING ANO SPLL USM LPI HPI A-L3W3-XHB-Cll'-* FSW12l. FSW12H A-L3W3-XW:-rL-, A-L3ll':J-XHB-l'H--4
Feed and Bleed the RCS 1n L3, Window 3 Feed me! Bleed the RCS In L:2, Window- 3 Food and BN!oo Sal9ty v~e the RCS In L3 Removed rn Window 3 f!V-11'3 tr1 I Vi 00 D-L3W3-XHE FALi.RE OF FEED
"~ SPI.L usw HPI
.A.-L3ll'3-XHE-Cll'-7 A-L311'3-XHE-FL-7 A-L3\f3-XBB-PH-7
Feed and Bleed the RCS L3, Window 3 Fakro to Dkxno$o Loss of RHR £vent D-L3W3-XHE FAL~ OF FEED FALi.iRE OF FEED AND SPLL USN:l AID SPLL IJSNl LPI HPI A-L3lf3-XHB-Clf-10 Jl'SW34L PS1f34H A-LJW3-XHE-PL-10 A-L3lf3-XH!-PH-10
Feed and Bleed the RCS 1n L3, Window 3 Feed Qld 61<!00 the RCS In L3 t11 Vt ts.l 0 D-L3W3-XBE FALi.ff: OF FEED AtO SPLL USNl H'1 A-L3lf3-XHB-Clf-12 FS1r34H A-L3W3-XHE-PL-12 A-L3lf3-XH!-l'H-12
Gravity from RWST 1n L3 Window 3 Gravity from RWST in L3, Safety Valve Removed in Window
.3 SV-W3 INSUF FLOW F<i~re to Diagnose
~OUGH LOW HEAD Loss of RHR Event NJECTION FLOW PATH D6-CG D-L3W3-XHB A-L3W3..:.XHE-G-15
Gravity from RWST 1n L3, Window 3 Gravity from RWST in L3, Safety Valve Removed in Window
.3 SV-W3
~~&It {~Wt-£AD N£CTION FLOW Fci~re to Diagnose Loss of RHR Event PATH D6-CG D-L3W3-XHE .A-L3W3..:.XHE-G-B
UNITY I IL3W4 I RL3W4 I VW4 I NL3W4 l FL3W4*I GL3W4 I SEQ # END-STATE-NAMES
- L3W4R6 -- LOSP L3, WINDOW W4, POS F6 1 @
2 @ 3 @ I I 4- OK 5 CD 6 @ tT1 I I VI I 7 OK t-.l 8 CD 9 @ 10 CD 11 @ 12 CD I.
UNITY IL3W4 RL3W4 NL3W4 SL3W4 FL3W4 SEQ # END-STATE-NAME L3W406 - - LOSP L3, WINDOW W4, POS 6 i- @ 2 @ 3 @ 4 @ 5 CD 6 @ 7 @ 8 CD
- l UNITY I IL3W4 I RL3W4 I VW4 I NL3W4 I FL3W4*I GL3W4 I SEQ # END-STATE-NAMES
- L3W4R10 -- LOSP L3, WINDOW W4, POS ~10 1
2 @ I 3 I 4 OK 5 CD 6 @ I t'I1 I I 7 OK UI tv 8 CD UI 9 @ 10 CD 11 @ 12 CD
top event for L3 LOSP L3 In window 4 IL3W OR FRHQ-L3
!L3ll' Ql4 p
DUAATION-R IQ REflJO. POS--RIO FRAC-POS IQ PRO.D-\fUUO c,JMTJON--R6 POS--R6 PR0B-'llfR5 DR-Ill" PROB-IUDe POS-W
Restore RHR given L3 1n POS 6 Refueling Failure to Restor ailure lo Diagnos RHR 2Lven L3 ln LOSP Event in Loss of RHR OS B of Refuelin OS 6 of Refueling PDSs 3-13 A-L3W4-XHE-CW-5 W3-S A-L3W4-XHE-R-5 D-L3W4--XHE
Non-Recovery of AC Power NL W4 Non-Recovery of AC Power in 4.55 HRS NRAC455
Reflux Cooling window 4 fo'hre lo Dioonose RCS loops lsololed Lo99 or RHR E:ven1 1o (;(luge Failure n POS $ of Rof~x CooKOQ 190-W4-INSlF fLOW TO SG FRM AT LEAST 1 MW PUMP FALTO QOSE FM.I.RE Cf" BOTH PORVS :':ECONOARY SIDE f-£AT REM0/.61..
Reflux Cooling window 4 Fa1re lo DioQnose RCS Loops Isolated Loos of RHR Event to Caooe Fal ire i1 POS 6 of Ref~x Cooing IB0-W4-A-L31r4-XB8-SF-8 FALTO CLOS£ FAILURE Cf" BOTH POINS S::COt.oARY SIDE I-EAT REMW.11. f'm\11 ssaw, 0 A-L3\H-J:BE-S1-B
Feed and Bleed the RCS L3, Window 4 Feed CJld B1eed the RCS In L2, Window 4 Feed ond Bleed the RCS In LJ Falkre lo Dkimoso Loss of Rlfl [vent I>-L3W4'-XHE fALURE <:A" FEED FALURE OF FEED ANO SPLL USING ANO SPLL USW LPI HPI rsw1a. FSW12H A-L3W4-XBB-PL-O A-L3W!-XIIE-FB-O
Feed and Bleed the RCS 1n L3, Window 4 Feed aid Bleed the RCS rn L2, Wndow 4 Food and Bleoo Softly Vr:we the RCS In LJ Removed rn Window 4 SV-lf4 D-L3W4c-XHE A-L:Jlf-&-:IBB-Cll'-8 FSW121. FSW12H A-L3W4-XBB-PL-B A-L3W-&-XHE-FB-B
- Feed and Bleed the RCS 1n L3, Window 4 Feed and Ble&<l the RCS In L3 FciM"o lo Dkionoso Loss of RHR Cvent D-L3W~-XHE f AL URE Of FEED FALi.ff OF FEEi>
MO SPU lJSB,JG AND SPLL ~ LPI H'1 A-L3lf.&-XBE-CW-l0 FSW34L A-L3lf.&-xm:-rH-10
Feed and Bleed the RCS 1n L3, Window 4 Food md 61'l9d the RCS In LJ Failure to Dloonosc Loss of RI-R £vent D-L3W4'-XHE FALURE <Yr FEED FALLff: <Yr FEED , . MO SPLL USNG MO SPlL USNl LPI l-f'1 A-L3Yr ,i-XHE-CW-li FSW34L FS11'34H A-L3'W4-XHB-FL-12 A-L31T-l-XHE-FH-12
Gravity from RWST L3, Window 4 Gravity from RWST in L3, tT1 I V, \.,) V, Safety Valve Removed in Window 4 SV-W4 INSlf" FLOW Fci~re to Diagnose
~OUGH LOW HEAD Loss of RHR Event N,IECTION FLOW PATH D6-CG I
D-L3W4-XRI': .A-L3W4-XHE-G-5
Gravity from RWST 1n L3, Window 4 Gravity from RWST in L3, Safety Valve Removed in Window 4-INSUF FLOW F<i~re to Diagnose OUGH LOW !-£AD Loss of RHR Event NECTION FLOW PATH D6-CG D-L3W-'-XHE A-L3W4-XHE-G-8
iyoharu Abe Ephraim Asculai ept. of Reactor Safety Research Division of Nuclear Safety
- Nuclear Safety Research Center Wagramestrasse, 5 Tokai Research Establishment P.O. Box 100 JAERI A-1400 Wien Tokai-mura, Naga-gun AUSTRIA Ibaraki-ken, JAPAN Vladirnar Asmolov Head, Nuclear Safety Department Sarbes Acharya I. V. Kurchatov Institute Department of Energy of Atomic Enegry NS-1/FORS Moscow, 123181 Washington, DC 20585 RUSSIA Dr. Ulvi Adalioglu J. de Assuncao Cekmece Nukleer Arastraima ve Cabinete de Proteccao e Egitim Merekezi Seguranca Nucl.ear P.K. 1 Ministerio da Indusstria Havaalani/ISTANBUL Ave. de Republica 45-6 TURKEY 1000 Lisbon PORTUGAL Dr. Eng. Kiyoto Aizawa Senior Engineer H.P. Balfanz, Head Reactor Eng. Dev. Department Institute of Probabilistic PNC Safety Analysis 9-13, Cherne, Akasaka TUV Nord Minato-K, Tokyo Grosse Bahnstrasse 31
-=AN Harry Alter Manager Applied Tech D-22525 Hamburg 54 GERMANY Pat Baranowsky Nuclear Systems Tech USNRC-AEOD/TPAB NE-46 MS: T-4A9 US DOE Washington, DC 20585 Robert A. Bari, Deputy Chairman Dept of Nuclear Energy
- R.M. Andrews Bldg 197C Nuclear Installations Insp. Brookhaven National Laboratory St. Peters House Upton, NY 11973 Balliol Raod, Bootle Merseyside L20 31Z UNITED KINGDOM Librarian Technical Information Section Battelle Pacific Northwest Lab George Apostolakis P. 0. Box 999 UCLA Richland, WA 99352 Boelter'Hall, Room 5532 Los Angeles, CA 90024-1597 Dr. John Baum Dept of Nuclear Energy Director of Reactor Engineering Radiological Sciences Div Argonne National Laboratory Bldg 703 M 9700 S Cass Ave Brookhaven National Laboratory Bldg 208 Upton, NY 11973 Argonne, IL 60439
- Dist-1
Eric Beckjord USNRC-RES/DO MS: T-10F12 Robert Bernero USNRC-NMSS/00 MS: T-8A23 Dennis Bley Buttonwood Consulting 17291 Buttonwood St. Fountain Valley, CA 92708 Roger Blond Boaz-Allen & Hamilton 43~0 East West Highway Bethesda, MD 20814 Andrea Besi Institute for Systems Engineering and Informatics M. P. Bohn CEC Joint Research Centre Division 6449 CP N 1 Sandia National Laboratories 1-21020 Ispra (Varese) Albuquerque, NM 87185 ITALY Dr. Mario Bonaca John Bickel Manager, Reactor Engineering Idaho National Engineering Lab. Northeast Utilities EG&G MS: 3850 P.O. Box 270 P.O. Box 1625 Hartford, Conn. 06141 Idaho Falls, ID 83415 Robert B. Borsurn Vicki Bier Nuclear Power Division Dept. of Industrial Engineering B & w Nuclear Tech University of Wisconsin-Madison 1700 Rockville Pike 1513 University Avenue, Room 389 Suite 525 Wisconsin, WI 53706 Rockville, MD 20852 Scott Bigelow Stephen Bault S-CUBED Electrowatt Engineering Services 2501 Yale SE, Suite 300 (UK) Ltd. Albuquerque, NM 87106 Grandford House 16 Carfax, Horsham West. Sussex RH12 IUP Prof. Dr. Dr.-Ing. E. H. Adolf ENGLAND Birkhofer Gesellschaft fur Anlagen und Reaktorsicherheit (GRS) rnbH Gary Boyd Forschungsgelande Safety & Reliability Optimization D-8046 Garching Services Federal Republic of Germany 9724 Kingston Pike, Suite 102 Knoxville, TN 37922 David Black American Electric Power Brookhaven National Laboratory (2) 1 Riverside Plaza Attn: Lev Neymotin Columbus, OH 43215 Arthur Tingle Building 130 Upton, NY 11973 Harold Blackman Idaho National Engineering Lab. EG&G MS: 3850 David M. Brown P.O. Box 1625 Paul C. Rizzo Associates, Inc. Idaho Falls, ID 83415-3850 300 Oxford Drive Monroeville, PA 15146-2347 Dist-2
om D. Brown A. L. Camp
- andia National Laboratories Division 6412 Dept. 6413 MS: 0748 P.O. Box 5800 Sandia National Laboratories Albuquerque, NM 87185 Albuquerque, NM 87185-0748 Robert J. Budnitz John Forbes Campbel Future Resources Associates, Inc. HM Superintending Inspector 2039 Shattuck Avenue, Suite 402 Health & Safety Executive Berkeley, CA 94704 St. Peter's House Balliol Road Bootle L20 31Z Gary Burdick UNITED KINGDOM USNRC-RES/SAIB MS: T-10F13 Leonel Canelas New University of Lisbon Arthur Buslik Quinta de Torre USNRC-RES/PRAB 2825 Monte de Caparica MS: T-9F31 PORTUGAL Edward Butcher Harold Careway USNRC-NRR/SPSB General Electric Co., M/C 754 MS: 0-10E4 175 Curtner Ave.
San Jose, CA 95129 Technical Library B&W Nuclear Service Co D. D. Carlson P. 0. Box 10935 Division 6411 ynchburg, VA 24506 Sandia National Laboratories Albuquerque, NM 87185 Stefaan Caeymaex Safety & Systems Section Jose E. De Carlos Nuclear Generation Dept. CSN International Coordinator TRACTEBEL Consejo de Seguridad Nuclear Avenue Ariane 7 Calle Justo Dorado 11 B-1200 Bruxelles 28040 Madrid BELGIUM SPAIN Leonard Callan, Administrator Annick Camino U.S. Nuclear Regulatory Cormnission International Atomic Energy Agency Harris Tower and Pavilion Wagramerstrasse 5, P.O. Box 100 611 Ryan Plaza Drive, Suite 400 A-1400 Vienna Arlington, TX 76011-8064 AUSTRIA J. Calvo S. Chakraborty Division of PSA & Human Factors Swiss Federal Nuclear Safety Consej o de Seguridad Nuclear
- Inspectorate Calle Justo Dorado, 11 Hauptabteilung fur die Sicherheit 28040 Madrid der Kernanlagen SPAIN CH-5232 Villigen-HSK SWITZERLAND Erulappa Chelliah USNRC-RES/PRAB MS: T-9F31 Dist-3
Mike Check S. Daggupaty NUS Environment Canada 910 Clopper Road 4905 Dufferin Street Gaithersburg, MD 20878 Downsview Ontario, M3H ST4 CANADA Nilesh Chokshi USNRC-RES/SSEB MS: T-lOLl Louise Dahlerup Inspectorate of Nuclear Inst. Danish Civil Defense & T. L. Chu Emergency Planning Agency Brookhaven National Laboratory 16, Datavej Department of Nuclear Energy DK-3460 Birkerod Bldg. 130 DENMARK Upton, NY 11973 John Darby Peter Cooper SEA, Inc. SRD/AEA Technology 6100 Uptown Blvd. NE Wigshaw Lane Albuquerque, NM 87110 Culcheth Cheshire WA3 4NE England Gerald Davidson Fauske and Associates, Inc. 16 W 070 West 83rd Street Susan E. Cooper Burr Ridge, IL 60521 Science Applications Int'l. Corp. 11251 Roger Bacon Drive Reston, VA 22090 Peter Davis PRD Consulting P.O. Box 2046 Michael Corradini Sheridan, WY 82801 University of Wisconsin 1500 Johnson Drive Madison, WI 53706 P. De Gelder Secretary, BELGIAN NUCLEAR SOCIETY (BNS) E.R. Carran AV Nuclear ANSTO Reasearch Establishment Avenue du Roi 157 Lucas Heights Reserch Labs. B-1060 Brussels Private Mail Bag 1 BELGIUM Manai, NSW 2234 AUSTRALIA Lennart Devel! Studsvik Nuclear Massimo Cozzone Studsvik Energiteknik AB A.N.P.A. S-611 82 Nykoping Via V. Brancati, 48 SWEDEN I-00144 Rome IT.ALY J. Devooght Service de la Metrologie Nucl George Crane University Libre de Bruxelles 1570 E. Hobble Creek Dr. Faculte des Sciees Appliqu. Springville, Utah 84663 50 Avenue F-D Roosevelt Bruxelles 5 BELGIUM Mark Cunningham USNRC-RES/PRAB MS: T-9F31 Dist-4
G. Diederick John Flack
- Conunonwealth Edison.co. USNRC-RES/SAIB LaSalle County Station MS: T-10Fl3 RRl, Box 220 2601 North 21st Rd.
Marsielles, IL 61341 Karl Fleming Pickard, Lowe & Garrick 2260 University Drive Chuck Dobbe Newport Beach, CA 92660 Idaho National Engineering Lab. EG&G MS: 3840 P.O. Box 1625 Terry Foppe Idaho Falls, ID 83415 Safety Analysis Engineering Rocky Flats Plant Energy Systems Group Mary Drouin Rockwell International Corp USNRC-RES\SAIB P.O. Box 464 MS: T-10Fl3 Golden, co 80401 Duke Power Co. (2) RH. Gauger Attn: Duncan Brewer Manager-Reliability Engr Steve Deskevich A/E Div 422 South Church Street Holmes & Narver Inc. Charlotte, NC 28242 R Roanne Circle Irvine, CA 92714 Bill Eakin Northeast Utilities Robert Gobel Box 270 Clark University Hartford, CT 06141 Center for Technology, Environment and Development 950 Main St. Stewart D. Bbneter Worcester, MA 01610-1477 USNRC 101 Marietta St., Suite 2900 Atlanta, GA 30323-0199 Paul Govaerts Studiecentrum voor Kernenergie (SCK/CEN) Adel A. El-Bassioni Boeretang, 200 USNRC-NRR/PRAB B-2400 Mol MS: 0-10B4 BELGIUM ENBA/DISP (2) Mr. Gubler Attn: Alvaro Valeri International Atariic Energy Agency Alfredo Bottino NENS/SAD B0842 Via Vitaliano Brancati, 48 Wagramerstrasse 5, P.O. Box 100 00144 Rana BUR A-1140 Vienna ITALY AUSTRIA Walter P. Engel Paul M. Haas, President PRAG MGR Analysis & Reg Matter Concord Associates, Inc. NE-60 725 Pellissippi Parkway CRYCITY Suite 101, Box 6 US DOE Knoxville, TN 37933 Washington, DC 20585
- Dist-5
F. T. Harper Division 6413 MS: 0748 Sandia National Laboratories Albuquerque, NM 87185-0748 Dr. U. Hauptmanns Steven Hodge Oak Ridge National Laboratories P. 0. Box Y Oak Ridge, TN 37831 Gary Holahan USNRC-AEOD/OSP Gesellschaft Fur Anlagen und MS: T-4A9 Reaktorsicherheit (GRS) mgH Schwertnergasse 1 D-5000 KOln 1 N.J. Holloway GERMANY A72.l Atomic Weapons Establishment Ademaston Sharif Heger Reading RG7 4PR UNM Chemical and Nuclear UNITED KINGDOM Engineering Department Farris Engineering, Room 209 Albuquerque, NM 87131 Griff Holmes Westinghouse Electric Co. Energy Center East Jon C. Helton Bldg. 371 Dept. ~1 Mathematics P.O. Box 355 Arizona State University Pittsburgh, PA 15230 Tempa, AZ 85287 William Hopkins Dr. P. M. Herttrich Bechtel Power Corporation Gesellschaft fur Anlagen und 15740 Shady Grove Road Reaktorsicherheit (GRS) mbH Gaithersburg, MD 20877 Schwertnergasse 1 5000 KOln 1 GERMANY Dean Houston USNRC-ACRS MS: P-315 Dr. D.J. Higson Radiological Safety Bureau Australian Nuclear Science & Der-Yu Hsia Technology Organisation Institute of Nuclear Energy Research P.O. Box 153 Lung-Tan 325 Roseberry, NSW 2018 TAIWAN AUSTRALIA Alejandro Huerta-Bahena Dr. Mitsumasa Hirano National Commission on Nuclear Deputy General Manager Safety and Safeguards (CNSNS) Institute of Nuclear Safety Insurgentes Sur N. 1776 NUPEC C. P. 04230 Mexico, D. F. 3-6-2, Toranomon, Minato-ku MEXICO Tokyo 108 JAPAN Peter Humphreys US Atomic Energy Authority Dr. S. Hirschberg Wigshaw Lane, CUlcheth Paul Scherrer Institute Warrington, Cheshire Vurenlingen and Villigen UNITED KINGDOM, WA3 4NE CH-5232 Villigen PSI SWITZERLAND Dist-6
. Huntington Dr. H. Kalfsbeek
- ommonwealth Edison Co. DG/XII/D/1 LaSalle County Station Commission of the European RRl, Box 220 Communities 2601 North 21st Rd. Rue de la Loi, 200 Marsielles, IL 61341 B-1049 Brussels BELGIUM J.S. Hyslop USNRC-RES/PRAB Yoshie Kano MS: T-9F31 General Mngr. & Sr. Engineer Systems Analysis Section 0-arai Engineer. Centr, PNC Idaho National Engineering Lab. (2) Higashi-Ibaraki-gun Attn: Doug Brownson Ibaraki-Ken, 133-13 Darrel Knudson JAPAN EG&G MS: 3840 P.O. Box 1625 Idaho Falls, ID 83415 William Kastenberg UCLA Boelter Hall, Room 5532 Idaho National Engineering Lab. (2) Los Angeles, CA 90024 Attn: Art Rood Mike Abbott EG&G MS: 2110 Barry Kaufer P.O. Box 1625 OECD/NEA Idaho Falls, ID 83415 "Le Seine St. Germain" 12 Boulevard des Iles 92130 Issy-les-Moulineaux Hanspeter Isaak FRANCE teilung Strahlenschutz auptabteilung fur die Sicherheit
- der Kernanlagen (HSK) Paul Kayser CH-5303 Wurenlingen Division de la Radioprotection SWITZERLAND Avenue des Archiducs, 1 L-1135 Luxembourg-Belair LUXEMBOURG Brian Ives UNC Nuclear Industries P. 0. Box 490 Ken Keith Richland, WA 99352 TVA W 20 D 201 400 West Surmnit Hill Kamiar Jamili Knoxville, TN 37092 DP-62/FTN Department of Energy Washington, D.C. 20585 G. Neale Kelly Commission of the European Communities Robert Jones Joint Research Centre USNRC-NRR/DSSA Rue de la Loi 200 MS: 0-8El B-1049 Brussels BELGIUM Edward Jordan USNRC-AEOD/DO John Kelly MS: T-4Dl8 Sandia National Laboratories P. 0. Box 5800 MS 0742 Albuquerque, NM 87185
- Dist-7
Knolls Atomic Power Laboratory (2) Dr. J.M. Lanore Attn: Ken McDonough CEA/IPSN/DAS Dominic Sciaudone Centre d'Etudes Nucleaires de Box 1072 Fontenay-aux-Roses Schenectady, NY 12301 B.P. n° 6 92265 Fontenay-aux-Roses CEDEX FRANCE Dr. K. Koberlein Gesellschaft fur Reaktorsicherheit mbH Jose A. Lantaron Forschungsgelande Consejo de Seguridad Nuclear D-8046 Garching Sub. Analisis y Evaluaciones GERMANY Calle Justo Dorado, 11 28040 Madrid SPAIN Alan Kolaczkowski Science Applications International Corporation Josette Larchier-Boulanger 2109 Air Park Rd. s. E. Electricte de France Albuquerque, NM 87106 Direction des Etudes Et Recherches 3 0 , Rue de Conde 75006 Paris Jim Kolanowski FRANCE Conunonwealth Edison Co. 35 1st National West Chicago, IL 60690 H. Larsen Head of Department Riso National Laboratory John G. Kollas P.O. Box 49 Institute of Nuclear Technology and DK-4000 Roskilde Radiation Protection DENMARK N.R.C.P. s. "Demokritos" P.O. Box 60228 GR-153 10 Aghia Paraskevi Lawrence Livermore Nat'l Lab. (4) Attiki Attn: George Greenly GREECE Marvin Dickerson Rolf Lange Sandra Brereton S. Kondo Livermore, CA 94550 Department of Nuclear Engineering Facility of Engineering University of Tokyo Shengdar Lee 3-1, Hongo 7, Bunkyo-ku Yankee Atomic Electric Company Tokyo 580 Main St. JAPAN Boston, MA 17407 D. Lamy B.T.F. Liwaang CEN/SCK Dept. of Plant Safety Assessment Dept. Scientific Irradiation Swedish Nuclear Power Inspec. Experiment & Study BR2 P.O. Box 27106 Boeretang, 200 S-10252 Stockholm B-2400 Mol SWEDEN BELGIUM Peter Lohnberg Expresswork International, Inc. 1740 Technology Drive San Jose, CA 95110 Dist-8
te~en M. Long Hideo Matsuzuru
- SNRC-NRR/SPSB Takai Research Establishment MS: 0-10E4 Tokai-mur Maka-gun Ibaraki-ken, 319-11 D. Eugenio Gil Lopez JAPAN Consejo de Seguridad Nuclear Calle Justo Dorado, 11 28040 Madrid Jim Mayberry SPAIN Ebasco Services 60 Chubb Ave.
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NRC FORM 335 U.S. NUCLEAR REGULATORY COMMISSION 1. REPORT NUMBER (2-89) (Assigned by NRC. Add Vol., Supp,, Rev., NRCM 1102, and Addendum Numbers, if any.) 3201, 3202 BIBLIOGRAPHIC DATA SHEET (See instructions on the reverse) NUREG/CR-6144 ND SUBTITLE BNL-NUREG-52399 uation of Potential Severe Accidents During Low Vol.2 Part 3A Power and Shutdown Operations at Surry, Unit 1: 3. DATE REPORT PUBLISHED Analysis of Core Damage Frequency from Internal MONTH YEAR Events During Mid-loop Operations-Appendices E June 1994
- 4. FIN OR GRANT NUMBER (Sections E.1-E.8) 11922
- 5. AUTHOR(S) 6. TYPE OF REPORT T.L. Chu,?. Musicki, P. Kohut, D. Bley 1, J.Yang, B. Holpies , G. Bfzoki, C.J Hsu, D.J. piamond, D. Johnso!) 1, J. Lin , R.F. Su , V. Dang 3, D. Ilberg , S.M. Wong, N. Siu 7. PERIOD COVERED /Inclusive Dates/
- 8. PER FORM I NG ORGANIZATION - NAME AND ADDRESS /If NRC, provide Division, Office or Region, U.S. Nuclear Regulatory Commission, and mailing address; if contractor, provide name and mailing address.)
1 Brookhaven National Laboratory PLG Inc., 4590 McArthur Blvd. Newport Bch, CA 92660-2027 2 Upton, NY 11973 AEA Technology, Winfrith, Dorchester, Dorset, England, DT2 8DH 3 MIT, Cambridge, MA 02139 (N, Siu currently at EG&G, Idaho Falls, ID 84315) 4 soreq Nuclear Research Center, Yavne 70600, Israel
- 9. SPONSOR ING ORGANIZATION - NAME AND ADD RESS /If NRC. type "Same as above"; if contractor, provide NRC Division, Office or Region, U.S. Nuclear Regulatory Commission, and mailing address.)
Division of Safety Issue Resolution Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 EMENTARY NOTES 11 . ASST RACT /200 words or Jess) During 1989, the Nuclear Regulatory Commission (NRC) initiated an extensive program to carefully examine the potential risks during low power and shutdown operations. The program includes two parallel projects being performed by Brookhaven National Laboratory (BNL) and Sandia National Laboratories (SNL). Two plants, Surry (pressurized water reactqr) and Grand Gulf (boiling water reactor}, were selected as the plants to be studied. The objectives of the program are to assess the risks of severe accidents initiated during plant operational states other than full power operation and to compare the estimated core damage frequencies, important accident sequences and other qualitative and quantitative results with those accidents initiated during full power operation as assessed in NUREG-1150. The objective of this report is to document the approach utilized in the Surry plant and discuss the results obtained. A parallel report for the Grand Gulf plant is prepared by SNL. This study shows that the core-damage frequency during mid-loop operation at the Surry plant is comparable to that of power operation. We recognize that there is very large uncertainty in the human error probabilities in this study. This study identified that only a few procedures are available for mitigating accidents that may occur during shutdown. Procedures written specifically for shutdown accidents would be useful.
- 12. KEY WORDS/DESCRIPTORS (List words or phrases that will assisrresearchers in locating the report.) 13. AVAi LABILITY STATEMENT Surry-1 Reactor-Reactor Shutdown; Surry-1 Reactor-Risk Assessment; Unlimited
- 14. SECURITY CLASSIFICATION Surry-2 Reactor-Reactor Shutdown; Surry-2 Reactor-Risk Assessment; Failure Mode Analysis, Reactor Accidents, Reactor Core Disruption, (This Page)
Reactor Start-up, RHR Systems, Systems Analysis, Thermodynamics, Unclassified (This Report) Sandia National Laboratories
- Unclassified
- 15. NUMBER OF PAGES
- 16. PRICE NRC FORM 335 (2-891
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