ML18151A262
| ML18151A262 | |
| 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-V02P3B, NUREG-CR-6144-V2P3B, NUDOCS 9408150234 | |
| Download: ML18151A262 (498) | |
Text
{{#Wiki_filter:NUREG/CR.;...6144 BNL-NUREG-52399 Vol. 2, Part 3B Evaluation of Potential Severe Accidents During Low Power and Shutdown Operations at Surry, Unit 1 ~lysis of Core Damage Frequency from. I*rnal Events During Mid-loop Operations Appendix E (Sections E.9-E.16) 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
. 9408150234 940630 PDR ADDCK 05000280 P PDR
AVAILABILITY NOTICE Availability of Reference Materials Cited in NRC Publications Most documents cited in NRC publications will be available from one of the following sources:
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Referenced documents available for inspection and copying for a fee from the NRC Public Document Room include NRC correspondence and internal NRC memoranda: NRC bulletins, circulars, Information notices, in-spection and investigation notices: licensee event reports: vendor reports and correspondence: Commission papers: and applicant and licensee documents and correspondence. The following documents in the NUREG series are available for purchase from the GPO Sales Program: formal NRC staff and contractor reports, NRC-sponsored conference proceedings, international agreement reports, grant publications, and NRC booklets and brochures. Also available are regulatory guides, NRC regulations In the Code of Federal Regulations, and Nuclear Regulatory Commission Issuances. Documents available from the National Technical Information Service include NUREG-series reports and tech-nical reports prepared by other Federal agencies and reports prepared by the Atomic Energy Commission, forerunner agency to the Nuclear Regulatory Commission. Documents available from public and special technical libraries Include all open literature items, such as books, journal articles, and transactions. Federal Register notices, Federal and State legislation, and congressional reports can usually be obtained from these libraries. Documents such as theses, dissertations. foreign reports and translations, and non-NRC conference pro-ceedings are available for purchase from the organization sponsoring the publication cited. Single copies of NRC draft reports are available free. to the extent of supply. upon written request to the Office of Administration, Distribution and Mail Services Section. U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001. Copies of industry codes and standards used in a substantive manner in the NRC regulatory process are main-tained at the NRC Library, 7920 Norfolk Avenue, Bethesda, Maryland, for use by the public. Codes and stan-dards are usually copyrighted and may be purchased from the originating organization or, If they are American National Standards, from the American National Standards Institute, 1430 Broadway. New York, NY 10018. DISCLAIMER NOTICE This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, or any of their employees, makes any warranty, expressed or implied, or assumes any legal liability of responsibility for any third party's use, or the results of such use. of any information, apparatus, product or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights.
- NUREG/CR-6144 BNL-NUREG-52399 Vol. 2, Part 3B Evaluation of Potential Severe Accidents During Low Power and Shutdown I . .
Operations at Surry, Unit 1 Analysis of Core Damage Frequency from Internal Events During Mjd-Loop Operations Appendix E (Sections E.9-E.16) Manuscript Completed: January 1994 Date Published: June 1994 Prepared by T. L. Chu, Z. Musicki, P. Kohut, D. Bley\ J. Yang, B. Holmes2, G. Bozoki, C. J. Hsu, D. J. Diamond, D. Johnson 1, 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 G Inc., 4590 MacArthur Boulevard, Newport Beach, CA 92660-2027 A Technology, Winfrith, Dorchester, Dorset, England, DT2 8DH
" IT, Cambridge, MA 02139 (N. Siu currently at EG&G, Idaho Falls, ID 83415) 4 Soreq 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-:t rogram. In phase 1, which was completed in Fall 1991, a coarse screenin, analysis examining accidents initiated 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 S, 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 anai)'sis 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 beiter 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 criteria 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 deterini.ne 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 SE-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
- Appendix E Contents 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 opera.tional 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 performed by Brookhaven National Laboratory(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 sequence~ and other qualitative and quantitative results with those accidents initiated during full power operation as assessed in NUREG-1150. The scope of the program include.s that of a level-3 PRA. The results of the program are documented in two reports, NUREG/CR-6143 and 6144. The reports are organized as follows: For 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 IA: Sections 1 - 9 Part lB: Section 10 Part IC: 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 S During a Refueling Outage Part 1: Main Report Part 2: Supporting MELCOR Calculations For Surey: NUREG/CR-6144- Evaluation of Potential Severe Accidents during Low Power and Shutdown Operations at Surry Unit-I Volume 1: Summary of Results Volume 2: Analysis of Core Damage Frequency from Internal Events during Mid-loop Operations Part 1: Main Report Part IA: 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 Parts:* 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.9 Event Trees and High Level Fault Trees for Two Unit Blackout (Bl) E-537
UNITY IB1W1 VW1 NB1W1 SB1W1 2CHGW1 GB1W1 - SEQ # END-STATE-Ni 1 @ 2 R5W1R6 3 CD 4 CD 5 CD . 6 R5W1R6 7 @ 8 CD 9 CD B1W1R6 EVENT TREE
I UNITY I IB1W1 I NB1W1 I 2CHGW:t I SEQ # END-STATE-NAMES 1 © I I I z T R5W1D6 I I 3 CD 4 CD B1W106 EVENT TREE
top event for B1 LOSP B1 1n window 1 m 0 PR!Q-B1 IL1Y 1116
Safety valves Not Re.moved Window 1 Sat ety Va Ives Not Remol/8 in Window 1 POS 1) of a POS 6 of a. Draine Refueling Outage t.1ointenance Outage P0S-R10 PCS-06 POS 6 of o Refuelin Outage POS-R6
- Pressu1zer .
Safety Vall/es Removed in WR6 PZR-SV-REt.10VEDW1
Non-Recovery of AC Power 1n 144 min. of LOOP trl I Ut
.i,..
l-.J NB W1 Non-Recovery of AC Power in 2.00 HRS NRACZOO
Non-Recovery of AC Power 1n 144 min. of LOOP NB1 1NU Non-Recovery of AC Power in 2.00 HRS SV-W1 NRACZOO
Reflux Cooling window Falkre lo DlaQnase RCS !,oc,p,, lsclaled l.099 or RHR £v..1 10 CoU9e Fcihre ii POS 8 of Refl.ix Coofll!I D-11111'1-XBB A-B1Wl-Xll!-SP-8 FALTO Q.OSE BOTH POINS SSHN1 A-B111'I-Xll1!-S1-8 A-BIW'1-XHB-S2-8
,AUXILIARY FEEDWATER TO 3 OF 3 SG WINDOW 1 (LSW1)
SBO AT UNIT 1 AFW 1 OF 3 SG (SBOU1-LS) POS 3-13 FAD.QR! OP AH SUPPLY mow: OlUT
- S11D 1-11
Cross-Tie of U2 CHG Flow 1n Bl Operator Pa.ils to ailure to DI acnos Opera.tor Failure SBO Event B1 o X-Tle CHG Flo Isol&.te CW Valves from U2 to U1 In SBO Event B1 D3U2 A-B1W1-XHE-CW-,&. D-B1W1-XHE A-B1W1-XHE-ZCH-4
Cross-Tie of U2 CHG Flow 1n -Bl tT1
- Opera.tor Failure I
Operator Fail:, to ailure to Diaino:i Vt o X-Tle CHG Flo .j>. bolate CW Valves SBO Event Bl 00 from U2 to Ul ln SBO Event B1 D3U2 . A-B1W1-XHE-CW-8 D-B1W1-XHE .A-B1lf1-XHE-2CH-8
Gravity from RWST B 1, Window 1 Gravity from RWST in 81 Safely Valve Removed in Window 1 sv-w, INSLf" FLOW Fd~re to Diagnose OUGH LOW 1£AD Loss of RHR Event N.ECTION FLOW In POS 6 PATH D-lllWJ-:XHE A-BlW.li-XHE-G-~
Safety Valves Removed Window 1 Safety Valve Removed ln
- Window 1 Sv Wl POS 10 of o POS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W'R6 P0S-R6 PZR-Sv-REMOVEDW1
Restore RHR given RHRS 1n Window 1 Restore RI-R Given RI-R28 in POS 6 of Refuering trl I VI VI FcillJ'e to Restore FaillJ'e to Dioi;r,ose Loss of RHR RI-R, .gven RI-R5 Loss of RI-R5 POSe 3-13 in Window 1 Event in Window 1 W3-S HOUSE-SBO A-R5W1-Xt-E-R-4 D-R5W1-Xt-E
UNITY IB1WZ VW2 NB1WZ SB1WZ 2CHGW2 GB1W2 SEQ # END-STATE-Ni 1 @ 2 R5W2R6 3 CD 4 CD 5 CD 6 R5W2R6 7 @ 8 CD 9 CD tr1 I Vi Vi l-..l B1W2R6 EVENT TREE
I UNITY I JBlWZ I NB1W2 I SB1WZ I 2CHGW21 SEQ # END-STATE-NAMES 1 @ I I I 2 T R5W2D6 3 @ I I I 4 CD .- 5 CD B1W2D6 EVENT TREE
top event for 81 LOSP 81 window 2 PR!Q-B1 ILlY Ill~ FRl,C-POS 10 r110*-waR1a HO&-TZRG PSOl-1121>8
- Sof ety valves Not Removed
- Window 2 Safety Valves Not R'emave in Window 2 POS 10 of a S 6 of a Drained Refuefing Outage Mointenarce Outage tI1 I
UI UI UI POS-R10 POS-06 OS 6 of a Refuefing Outage . POS-R6 Pressurizer Sofety V<;t.tes Removed in W2R6. PZR-SV-REt.10VEDW2
Non-Recovery of AC Power 1n W2 NB W2 NON-Recovery of AC Power in Z.62 HRS NRAC262
Non-Recovery of AC Power 1n W2 NB1 2NU NON-Recovery of AC Power in 2.62 HRS SV-W2 NRAC262
Reflux Cooling ,n window 2 RCS !,.oc,ps lsdot.ed
.to CoU98 Fal1r1 o1 Rofux Coofno tI1 I
UI UI 00 LSW23-B1. A-B1ll'2-J:BB-sr-a FALTO Q.OSE BOTH PORI/S SSHWll3 A-Dl'lf2-J:BE-SJ-B A-Dnr2-:mz-ae-11
- AUXILIARY FEEDWATER TO 2 OF 3 SG WINDOW (LSW23)
,lf'lf-CltV-al-27!18 DW'OH PAGE1&9
Cross-Tie of U2 CHG Flow 1n *Bl 11ilure to Di 11inos Operator Failure Operator Fails lo o X-Tle CII G Flo Isolate CW Valves SBO Event Bl from UZ to Ul In SllO Event Ill D3U2 A-B1W2-XHE-CW-4 D-B1WZ-XHE A-Bl W2-XHE-2CH
- Cross-Tie of U2 CHG Flow 1n B1 Operator Pa.its to ailure to Dia,nos
- OpeI"alor FalluI"e SBO Evenl B1 o X-Tle CHG Flo, Isolate CW Valve:i from U2 to Ul In SBO Event Bl D3U2 A-B1W2-XHE-CW'-8 D-B1W2-XHE A-B1W2...;.XHE-2CH-6
Gravity from RWST 1n .B 1, Window 2 Gravity from RWST in B1
. Safety Valve Removed in Window 2
sv-w2 INSU:: FLOW Fci~re to Diagnose
~OUGH LOW t£AD Loss of RHR Event N.ECTION FLOW in POS 6 .
PATH D6-CG D-B1"W'2-XRE A-B1W~-XHE-G-a
Safety Valves Removed 1n Window 2 Sof ety Valve Removed in Window 2 SV W2 POS 10 of a POS 6 of a Drained Refueling Outage Mointencmce Outage P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Ouloge Safety Valves Removed in W2R6 J ' P0S-R6 PZR-SV-REMCNEDW2
_Restore RHR given RHRS Window 2 Restore RHR Given Rl-fl28 in POS 6 of Refuefing faihre to Restore F<ik.lre to Diagnose Loss of RtR Rl-fi, gven RI-RS Loss of RHR5 POSs 3-13 in Window 2 Event in Window 2 HOUSE-SBC W3-S A-R5W2-xt-E-R-4 D-R5W2-xt-E I
l UNITY I 1a1w3 I vw3 I NB1W3 j 2cHGW31 GB1W3 I SEQ# END-STATE-NAMES 1 @ 2 r R5W3R6 I 3 @ l I 4 CD I 5 CD I 6 '~ R5W3R6 I 7 @ 8 CD 81W3R6 EVENT TREE
UNITY lB1W3 VW3 NB!W3. 2CHGW3 GB1W3 SEQ # END-STA TE-NAMES 1 @ 2 R5W3R10 3 @ 4 CD
.5 CD 6 R5W3R10 7 @
8 CD B1W3R10 EVENT TREE
I UNITY I .IB1W3 I NB1W3 I SB1W3 ,-ZCHGW31 SEQ # END-STATE-NAMES 1 @ I I I 2 T R5W3D6 3 @ I I @ I I 4. 5 CD B1W3D6 EVENT TREE
\ .
Sof ety valves *Not Removed Window 3 Scife~ Valves Not Remove in Wincbw 3 S 6 of o Drdned Mdntencnce Outage WI G7
- POS-D6 OS 6 of o Refuering POS 10 of o Outage Refuefing Outage POS-R6 POS-R10 Pressurizer Press1.rizer SofetY. Vdves Sofet)' Valves Remove<! in W3R6 Removecl in W3R6 PZR-SV-REMOVEDW3 PZR-SV-REMOVEDW3
top event for B1 LOSP 81 window 3 PR!Q-81 ILLY 014
.RD'Ul. POS-fflO PIOB-Y3RG tl!-111" no1-w:ms
Non-Recovery of AC Power tT1 I V\ -.J 0 NB W3 Non-Recovery of AC Power in 3.48 HRS NRAC346
Non-Recovery of AC Power rrl I VI -..J NB1 3NU Non-Recovery of AC Power in 3.48 HRS SV-W3 NRAC346
Reflux Cooling 1n window 3 RCS Locpa Isolated 10 CGuge f'aiire of Rofknc Cooing BB1 3AII l>-B1W3-Xlm INSLF' Fl.OW TO SG FRM AT LEAST 1 >iW *fll.M> LS1r23-Bl A-BilrS-XBB-SF-5 f'Al. TO Q.OSE f'Al.~ r:F BOTH PORVS SECOtOARY SIDE f£AT REl,KMtL
.A-Bl'W3-XBE-B1-~ A-B1W3-XHE-Be-5
AUXILIARY FEEOWATER TO 2 OF 3 SG WINDOW 2&3
~-=-'---~ (LSW23)
.1.nr-crct-ca-2,:s1e
.U'W"SH ........ ......
PAGE1&9
Cross-Tie of U2 CHG Flow in B1 Operator Pails to ailure to Di 11eno:,
- Opera.tor Failure
!sol ate CW Valves SBO Event Bl o X-Tle CHG Flo In SBC Event B1 . from U2 to U1 D3U2 A-B1W3-XHE-CW-4 D-B1W3-XHE A-B1W3-XHE-2CH * *
- - - - - - - - - - - ~ - - - - Cross-Tie of U2 CHG Flow 1n *B1 ailure to Di ainos
- Operator Failure Operator Fails to o X-Tle CHG Flo faol ate CW V 11.lvea SBO Event Bl from U2 to Ul In 5BO Event B1 D3U2 A-B1W3-XHE-CW-8 D-B1W3-XHE A-B1W3-XHE-2CH-8
Gravity from RWST B 1, W.indow Gravity from RWSr in 81
- Safety Valve Removed in Window
.J SV-W3 INSlf" FLOW Fcik.Jre to Dioqrose OUGH l:OW 1-£AD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D6-CG D-B1W3-Xlll: A-811'31-XHE-G-O
Safety Valves Removed Window 3 Sofety Valve
- Removed in Window 3 .
POS 6 of a Drained Maintenance Oulage POS-D6 POS 6 of o Refuelin Pressurizer POS 10 of a Pressu-izer Outage Safety Vdves Refueing Outage Safety Valves Removed in W3R6 Remove<! in W3R6
/
P0S-R6 PZR-SY-REMOVEDW3 P0S-R10 PZR-SV-REMOVEDW3
Restore RHR given RHRS Window 3 Restore RHR Given RHR5 in window 3 tI1 I VI -....J 00 foihre to Restore Fdlure to Diagnose Loss of RHR-5 ffi-R, <j,len RI-R5 Loss of RHR5 POSs 3-13 in Window 3 Event in Window 3 HOUSE-SBO W3-S A-Rl5W3-XHE-R-4. D-H~W3-XHE
UNITY IB1W4 VW4
- NB1W4
!..--.---r--~-----,,---*
SEQ # END-STATE-NAMES 1 @ 2 R5W4R6 3 @ 4 @ 5 CD 6 R5W4R6 7 @ 8 CD B1W4R6 EVENT TREE
UNITY IB1W4 VW4 NB1W4 2CHGW4 GB1W4 SEQ # END-STATE-NAMES 1 @ 2 R5W4R10 3 @ 4 @ 5 CD 6 R5W4R10 7 @ 8 CD [Tl ~ 00 0 B1W4R10 EVENT TREE
I UNITY I IB1W4 I NB1W4 I SB1W4 I 2CHGW41 SEQ # END-STATE-NAMES
- 1 @
I 2 T R5W4D6 I I @ I I 3 4 @ I - 5 CD
~
B1W406 EVENT TREE ~ 00
/
top event for B1 .LOSP 81 ,n window 4 n.t oa PR!Q-B1 tr1 I Ul 00 l-.l ILLY D14 FRl,C-POS 10 PR0B-1l4R8
- Safety valves Not Removed ,n Window 4 Sof ety Valves Not Remove in Window 4 S 6 of a Droned Mantenaice Outage WI G7 POS-06 OS 6 of a Refuefing POS 10 of a Outage Refuefing Outage VW G1 P0S-R6 POS-R10 Pr83surizer Pressu-izer Safety Vclies Safety Val'les Remove<! in W+R6 Removed in W4R6
\
PZR-SV-REM9YE11'11'4 PZR-SV-REMOVEDW~
Non-Recovery of AC Power tr! I VI 00 .i,,. NB W4 Non-Recovery of AC Power in 4-.55 HRS NRAC4-55
Reflux Cooling window 4 Fcikre lo Dlocinose RCS Locps lsololed L08S or RHR £vent to Couse Falhra il POS 6 of Refknc Cooing BB1 4.A.5 190-'11'4-D-B1W4.-XBB INSUF f"LOW TO SG FRM AT LEAST 1 Af'W PUM' SB1 4.1>:1 A-lll\H-XHE-Sl'-:1 FALLRE CF SECONDARY SOE HEAT REMO',l,6l_ A-BIW4.-XHl!-S2-~
AUXILIARY FEEDWATER TO 1 OF 3 SG WIND OW .----'-4___,______, (LSW4)
....,,JUI .UW-CltV-00-U!al PAGE1&9
Cross-Tie of U2 CHG Flow 1n Bl nilure to Di a.ino:i Operator Failure Operator Fa.1111 to SBO Event Bl o X-Tle CHG Flo Isolate CW Ve.Ives from. U2 to U1 In SBO Event B1 D3U2 A-B1W4-XHE-CW-~ D-B1W4-XHE A-B1W4-XHE-2CH-~
Cross-Tie of U2 CHG Flow 1n Bl tTl I VI 00 00 Operator Pa.HS* .to ailurc to Di acnos Opera.t.or Failure
. SBO Event Bl o X-Tle CHG Flo Isolate CW Va.Ives froi:n U2 to U1 in SBO Event B1 D3U2 A-B1W.4--XHE-CW-8 D-'-B1W4--XHE A-B1W4-XHE-2CH-8
Gravity from RWST 1n B1., Window 4 Gravity from RWST in 81 Safety Valve Removed in Window 4-INSlf" FLOW Fci~re to Diagnose OUGH LOW 1-£AD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D6-CG D-B1Y,6.-XHE A*B1W4-XH!:-G-O
Safety Valves Removed 1n Window 4
- Sofety Valve Removed in Winnow 4
tTl I VI POS 6 of a Drained Mointenonce Outage 8 P0S-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressu-izer Outage "Sofety Vdves Refueing Outage Safety Valves Removed in W4R6 Removed in W4R6 POS-R6 PZR-SV-REMOVEDW4 P0S-R10 PZR-SV-REMOVEDW4
Restore RHR given RHRS 1n Window 4 Restore RrR Given RI-R5 in Window 4 tI1 I - V\ '° Fciltre to Restore Failtre to Diag-,ose Loss of RHR RI-fl, gven RI-R5 Losa of Inventory POSe 3-13 in Window 4 in Window 4 HOUSE-SBO W3-S A-Rl3W4--XHE-R-(5 D-R13W4--XHE
Appendix E.10 Event Trees and High Level Fault Trees for Two Unit Blackout(B2) E-592
UNITY IB2W1 VWl NB2W1 GB2W1 SEQ # END-STATE-NAMES 1 @ 2 T R5W1R6 3 CD 4 CD 5 T R5W1R6 6 CD 82W1R6 EVENT TREE
UNITY IB2W1 NB2W1 SEQ # END-STATE-NAMES
- 82W 1D6 - UNIT 1&2 BLACKOUT WINDOW 1, POS _06 1
2 T R5W1D6 3 CD
top event for B2 LOSP B2 1n window 1 PR!Q-Ba ILl'I' !114 POS-RIO
Non-Recovery of AC Power -in 144 min. of LOOP Non-Recovery of AC Power in 2.00 HRS NRACZOO
Non-Recovery of AC Power 1n 144 min. of LOOP NB2 !NU* Non-Recovery of AC Power in 2.00 HRS - SV-Wl NRAC200
Gravity from RWST 1n B2, Window 1 Gravity from RWST in B2 tTl I u, \0 00 Safety Valve Removed in Window 1 sv-w, INSLf FLOW F<i~re to Diogoose OIJGH LOW t-£AD Loss of RHR Event N..ECTION FLOW in POS 6 PATH
.. D6-CG D-B2Wl-XHI: .A-Ball"J-XHl~-G-'-
UNITY IB2W2 VW2 NB2W2 GBZW2 END-STATE-NAMES 1 @ 2 T R5WZR6 3 CD 4 CD 5 T R5W2R6 6 CD B2W2R6 EVENT TREE rrl I . Ut
\0 \0
UNITY IB2W2 . NB2W2 SEQ # END-STATE-NAMES 1 @ tr:I 0\ 2 T R5W2D6 0 0 3 CD B2W2D6 EVENT TREE
top event for B2 LOSP B2 window 2 Pll!Q-Da ILlT 014 POS-ftlO F'RAC-POSIO J1aD11-1flRIO I PIOS-Tzaft Pll01~1f21JO
Non-Recovery of AC Power 1n W2 tI1 I °' 0 1-.l NON- Recovery of AC *Power in 2.62 HRS NRACZ62
Non-Recovery of -Ac Power 1n W2 tl'1 I °'w 0 NB2 2NU NON-Recovery of AC Power in 2.62 HRS SV-W2 NRAC262
Gravity from RWST* 1n B2, Window 2 Gravity from RWST in B2 Safety Valve Removed in Window 2 SV-W2 INSLf" FLOW Feil.Ire to Diagnose OUGH LOW !-£AD Loss of RHR Event N.£CTION FLOW in POS 6 PATH D-:B2W2-XHE A, B2lf2-XHE-G-4
- I UNITY I IB2W3 I VW3 I NB2W3 I GB2W3 I
- SEQ #
END-STATE-NAMES
- 1 @
I 2 T R5W3R6 3 CD
' I 4 CD 5 T R5W3R6 6 CD B2W3R6 EVENT TREE
UNITY IB2W3 VW3 NB2W3 GB2W3 SEQ # END-STATE-NAMES 1 @ 2 T R5W3R10 3 CD 4- CD 5 T R5W3R10 B CD B2W3R10 EVENT TREE trl I 0\ 0 0\
UNITY IB2W3 , NB2W3
- SEQ # END-STATE-NAMES I 1 tI1 I
I I 2 T R5W3D6 °' 0 -..J I 3 CD B2W3D6 EVENT TRE E
top event for B2 LOSP B2 ,n window 3 Pll!Q-82
- tI1 I
0\ 0 00 ILl'I' OH POS-f!IO Pao*-W3Al0 HDB-'l')H
Non-Recovery of AC Power NB W3 Non-Recovery of AC Power in 3.48 HRS NRAC346
Non-Recovery of AC Power tr:I I C\ 0 NBZ 3NU Non-Recovery of AC Power in 3.48 HRS SV-W3 NRAC346
Gravity from RWST B2, Window 3 Gravity from RWSI' in 82 tr! -°' I Safety Valve Removed in Window
.J INSUF FLOW Fdl!re to Diogoose OUGH LOW 1-£AD Loss of RHR Event NECTION FLOW in POS 6 PATH D-B211'3-XHE A-B2lf3-XlD!-C-,
UNITY IB2W4- VW4 NB2W4 GB2W4 SEQ # END-STATE-NAMES 1 @ 2 T R5W4-R6 3 @l 4 CD 5 T R5W4R6 6 CD 82W4R6 EVENT TREE
I UNITY I IB2W4 I VW4 I NB2W4 I GB2W4I SEQ # END-STATE-NAMES 1 @ I 2 T R5W4R10 J 3 @ 4 CD 5 T R5W4R10 6 CD B2W4R10 EVENT TREE
UNITY IB2W4 NB2W4 SEQ# END-STATE-NAMES 1 @ 2 T R5W4D6 3 CD B2W4D6 EVENT TREE
top event for 82 LOSP 82 window 4 PR!Q-Ba tI1 I ....C\UI ILlY 014 POS-RJJ PIIOll-lfllllO Pft0B-1f4R5 OR-Mr
Non-Recovery of AC Power tI1 I 0\ 0\ NB W4 Non - Recovery of AC Power in 4.55 HRS NRAC4-55
Gravity from RWST 1n B2, Window 4 Gravity from RWST in B2 Safety Valve Removed in Window 4-INSLf" FLOW Fci~re to Diagnose OUGH LOW t-£AD Loss of RHR Event N.ECTION FLOW in POS 6 PATH D-B2W4.-XHE .A.--:B2W4.-XHE-G-4.
Appendix E.p Event Trees and High Level Fault Trees for Loss of 4KV Bus(4K) E-618
- UNITY I4KW1 H4KW1 R4KW1 F4KW1 C4KW1 SEQ #
END-STATE 1 @
- 2 @
' I 3 @ I I 4 CD I 5 CD 6 @ 7 @ I I I 8 I CD 9 CD Event Tree for Loss of 4KV Bus - W1/D6
UNITY I4KW1 H4KW1 R4KW1 VW! S4KW1 F4KW1 G4KW1 C4KW1 SEQ # END-STATE-NAMES 1 2 @ 3 @ 4 CD 5 CD 6 CD 7 8 @ 9 CD 10 CD 11 12 @ 13 CD 14 CD 15 CD 16 @ 17 @ 18 CD 19 CD Event Tree for Loss of 4KV Bus - W1/R6
top event for loss of 4KV window 1. *- OUR4TIO~R10 REFLJa POS-RlO f'R<\C--P0510 PROB->J/1R10 POS-RS PROB--1#106 PDS-06
4KV SYSTEM RECOVERY IN WINDOW 1
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 1 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. trJ I °'w tv*
!LURE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUSH IN P6 0 P6 OF DR MT W3-S A-4KW1-XHE-R-12. D-4KW1-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 1 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT ..
!LURE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-4KW1-XHE-R-3. D-4KW1-XHE
Reflux Cooling 1n 1
~~.~,
in POS 6 of RofU8li,g RCS Loopo l,obled lo Couse Fcikro of Roflwc Coding D-4KWI-XHE INSUF R.OW TO 3 SG FRM AT LEAST 1 AFW PUMP LSW1 S4KW G3-17 A-4Klfl-XHE-S1-17 O~orala- Failure FM.URE OF FM. TO U.OSE to Blood tho SECOND.ARY SIDE BOTH PCR\15 SG* 1 given R3 HEAT REMOVAL SSIM'1 SSHIV1 A--4KWI-XBE-S3-17
Reflux C9oling 1n windo'N 1
=a~1 in POS 6 of Rofueling RCS Loops loolated
[!~'"o/°~°C in PCS 5 lo eau.. F,ikre of Reflux Coding Oi I O'\ l..:l O'\ ISO-W1 D-4KW'l-XB!: INSUF FLOW TO J SG FRM AT LEAST 1 Af'W PUMP LSW1 A-41tWl-XB!:-B1-8 Operator Foikro FM..URE OF FM.: TO QCSE to Bleed tho SECONDARY SIDE BOTH PCRvS SG* 1 given RJ HEAT REMOV,11. SSHW1 SSI-M'1 A,-41.Wl-XB!:-B2~ A-4KW'l-XB!:-S3~
* \
- Feed and Bleed the RCS
- Window 1 Feed and Blood U. RCS i, RHt3, Wndcw 1 Feed cnl Bleed tho RCS i, Rlfi3, POS 6 cf Refu:fng niar o-u. BV-lU trl I
0\ Iv -.J FAILURE OF FEED FM.URE OF FEED AND SPU. USING AND SPLL USING LP1 HPt F9N12L F9N12H
Feed and Bleed the RCS 1n Window 1 Feed and Bleed the RCS ii Rlfl3. W"ndow 1 Feed and Bleed Safety Vdve the RCS i:, Rlfl3, Remowd ii W"ndow POS 6 of Refueling 1 BV-W1 tr1 I 0\ Iv 00 D-41t'i1'1-XBE F4.Kll' G2-6 F/IJLURE OF FEED F/IJLURE OF FEED AND SPLl. USING ANO SP~ USING .* ., LPI FSN121.. F9N12H A-u:w1-XBE-FL-6 A-4.K'i1'1-XBE-FH-6
Feed and Bleed the RCS with V foiled
\/Vindow 1 Faed and Blead the
- RCS in Rlfl3, POS 6 of Refuenng Failure to Diagnase Loss of RI-R Event in POS 6 F4-KWJVG0-10 D-4-KWJ-XBE FALLRE OF FEED FALLRE OF FEED AJ,0 SPLL LS tlG AJ,O SPLL LS tlG I-Pl LPI FSW12H FSW12L A-4-KWJ-XBE-FR-10 A-4-KWJ-XBE-FL-10
Feed and Bleed the RCS with V failed ,n
\Nindow 1 Feed and Bleed the RCS in RHR3, POS 6 of Refuefing Failure to Diagnose Loss of R~ Event in POS 6 trJ I
°' l.,J 0 D-4-B:W1-XHE FAILLRE OF FEED FALLRE Cf" FEED AND SPLL USING Al>O SPLL US ING HPI LPI FSW12H FSW12L A-4-KWJ-XBE-FR-19 A-4-B:W 1-XBE-FL-19
GrcJvity from RWST 1n Window 1 Grovitv from RWST in POS 6 of Refuering S<lfety Valve Removed in Window 1 gv'-\f1 INSUF FLOW Failu-e to Diagnose THROUGH LOW HEAD Loss of RHR Event IN..ECTON FLON *inPOS6 PATH
'.os...:cG D-4K\f1-XHE A-4K\f1-XHE-G-15
Gr(Jvity - from RWST 1n Window 1 Grovity from RWST in POS 6 of Refueflng S<Jfetv Valve Removed"' in Window 1 G4KWlG2-6 SV-W1 INSLf FLOW Failtre to Diaqnose THROUGH LOW 1-EAD Loss of RHR Event IN.ECTON FLON in POS 6 PATH D-U:Wi-XHE .A.-4ICW1-XHE-G-6
Failure of High Pressure Recirculation 1n W.indow 1 IN5U' AJlW FIi
!PSI PM'S TO CIWIG '5lJCT H2 P.&K1rl-l.S. VIII LPR TO I.PR TO ca..D UJJ lllf LEG VENll.12 A-<<w1'-XIIE-C-13
Failure of High Pressure Recirculation in Window 1 r&S'U. LPR IIV'-v1 CU:'tfUl4-~ rr1I °'..,.w H1 H2 Jl'4.01-&. H,KWl-4, VW1 I.O<T IWl IWH.G. IIENTl12 P-iDll', A-4KW1-XHE-C-4 D-4Kll'1-XliE
!'AS ~Slt.O
. ~-4m1-XIE--0-4 CJ-.41<W1->0t A-4K11'1-XHE-C--4 D--4Kll'1-l0£
Failure of Hig.h Pressure Recirculation 1n Window 1 CID -11 HI Kl. HffJ-11 W:NL12 N-1.W1Sll l)-t,D1-:DD
Failure of High Pressure Recirculation 1n Window 1
Failure of Recirculation :Spray/ 1n Window 1 HPR failure loss of 1-f'SH
<I to open oontairme t P4ICW10-13 CON-VFC-RP--COREM Failtre to Di~nose Loss of RHR Event in POS 6 P4ICW1G0-13 D-4KW1-XHE A-4KW1-XHE-P-13 FALUiE OF INS~
Y F£CIRCULATIO F1LPSD F2LPSD
Foilure of Recirculation Spray Window 1 HPR f oilure loss of 1-PSH d e to open contoirrn t tI1 I P4K'Wl0-18 °' w 00 CON-VFC-RP-COREM Foih.re to Dioqnose Loss of RHR Event in POS 6 D-4KW1-XHE A-4K'W1-XHE-P-18 FALlff: OF NSl:E FALlff: OF oursce: Y ~CRCULATIO Y ~CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray *
- Window 1 HPR failure .
loss of 1-PSH d to open contoirm t:1 I ~ CON-VFC-RP-COREM \0 Foiltre to Diogpose Loss of RHR Event in POS 6 D-4KW1-XHE .A.-4KW1-XHE-P-4 F1LPSD F2LPSD
Failure of Recirculation Spray Window 1 HPR failure l¢ss of 1-PSH to open contairTTI t CON-VFC-RP-COREM Failll'e to Diaqnos,e ~ator F9illre Loss of RHR Event to Estabish in POS 6 Recrculation in W1 D-4KW1-XHE A--4-KW1-XHE-P-9 F1LPSD F2LPSD
Failure of Recirculation Spray 1n Windovv 1-cause HPR failure P-iKlHN13 F(lihre to Di(lg_nose Loss of RHR Event in POS 6 D-4KW1-XHE A-4KW1-XHE-P-13 FAURE OF INSt:£ SPRAY FI:CIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray* in 'Ni ndovv 1-cause HPR failure Foili.re to Dlo<tnoee ~otor FQiltre Loss of RHR Event to Estd>ish in POS 6 Recrcukrtio n in W1 D-4KW1-XHE .A-4KW1-XHE-P-18 FALrnE OF NSCE PRAY ~CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray in \Ni ndovv 1-cause HPR failure Failu-e to Diaqnose Loss of RHR Event in POS 6 D-4KW1-XHE A-4KW1-XHE-P-4 F1LPSD F2LPSD
Failure of Recirculation Spray* in Windovv 1-* cause HPR failure Foilire to Di<1qnose Loss of RHR Event in POS 6 P4ICW1NG1-9 D-4KW1-XHE A-4KW1-XHE-P-9 F1LPSD F2LPSD
- - - - - - - - - - - - - - - ~
UNITY I4KW2 I H4KW2 R4KW2 S4KW2
- F4KW2 C4KW2 SEQ # END-S 1
2 I 3 OK I I I 4 @ I I I 5 CD I 6 CD 7 I 8 OK I I I 9 @ I I I 10 CD I 11 CD Event Tree for Loss of 4KV Bus - W2/D6
UNITY I I4KW2 I H4KW2 I R4KW2 I VW2 I S4KW2 I F4KW2 I G4KW2 I C4KW2 I SEQ # END-STATE-NAMES 1 @
- 2. @
3 l I I 4 5 CD CD CD tI1 II I 6 7 8 0\ I I I I 9 CD i I .i::,. 0\ ' 10 CD 11 @ 12 @ I 13 CD I 14 CD 15 CD 16 @ I 17 @ I I 18 CD I 19 CD Event Tree for Loss of 4KV Bus - W2/R6
top event for loss of 4KV In window 2 DURATI0-10 REflJEl. POS-RIO PR0B-'!l2IUD DURATION-RS POS-R6 PROB-'W2RS OR-MT PROB-'112DS
4KV SYSTEM RECOVERY IN WINDOW 2
- RESTORE RHR GIVEN LOSS OF EMERGENCY BUS H IN 4KV window 2 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 -
DR. MT. F !LURE TO DIAGNO E LOSS OF RHR IN LO S OF 4KY BUS H IN POS'S 3-13 P6 OF DR MT W3-S A-4KW2-XHE-R-12* D-4KW2-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 2 RESTO E RHR GIVEN LO S OF 4-KV MERG BUS IN POS 6 - DR. MT.
!LURE TO RESTOR F !LURE TO DIAGNO E HR GIVEN LOSS 0 LOSS OF RHR IN LO S OF 4-KV BUS H IN POS'S 3-13 4- BUS H IN P6 0 P6 OF DR MT W3-S A-4-KW2-XHE-R-3. D-4-KW2-XHE
- Feed and Bleed the RCS
* 'Window 2 Foed and Bloed tho RCS i, RHR3, Wnlcw 1 Foed ond Bk>ed tho RCS i, RIR3, POS 6 of Refuoing SV-'ITT!
trl I 0\ Ut FM.URE OF FEED F>l..l.lRE OF FEED AM> SPLL USING 111'1) SPLL USING lP1 ff'I F9N121. F9N12H
Feed and Bleed the RCS 1n \Nindow 2 Feed and llaed the RCS i1 RIR3, POS 6 of Refueing D-H:Wlil-XBE FM.URE OF FEED FM..URE OF FEED ANO SPI.L USING ANO SPI.L USING LPI HPI ** F9N12H A-n:wa-mE-FL--6
Feed and Bleed the RCS with V foiled
\Nindovv 2 FBed and Bleed the RCS in RHR3, POS 6 of Refuenng Failure to Diagnose Loss of RI-R Event in POS 6 D-4-KW2-xm:
FAD..LRE OF FEED FAURE OF FEED AND SPLL *L61NG At-lJ SPLL L6NG
. HPI LPI FSW12H FSW12L A-4-KW2-XHE-FH-10 A--4-KW2-xm:-FL-10
Feed and Bleed the RCS with V failed ,n
\Ni ndovv 2 Feed and Bleed the RCS in Rlfl3, POS 6 of Refuering Failure to Diagnose Loss of RJ-R Event in POS 6 F4-KW2VG0-19 D--4-X:W2-XHE FALL.RE OF FEED Operotc-r Failire FALL.RE OF FEED At-0 SPLL LS NG to use 1-tlSI in At-0 SPLL LSNG I-Pl feed and spil LPI in Window 1 FSW12H FSW12L A-4-X:W2-XHE-FH-19 A--4-X:W2-XHE-FL-19
Gravity from RWST Window 2 Gr<IVitv from RWST in POS 6 of Refuefing tI1 I 0\ V, V, S<Jfety V<ilve Removed in Window 1 sv-we INSUF FLOW F<iih.re to Di<ignose Tl-ROUGH LOW 1-EAD Loss of RHR Event IN.ECTON FLOW in POS 6
- PATH D-4KWe-XHE A-*U\\'e-XHE-G-15
Gravity from RWST Window 2 Gravitv from RWST ,n POS 6 of Refuefing tr1 I C\ Ul C\ S<Jfety Valve Removed in Window 1 sv-we INSUF FLOW Foihre to Diagnose THROUGH LOW HEAD Loss of RHR Event NJECTIJN FLOW in POS 5* PATH 1
- D6.:.'..CG D-4KW2-XHE A-4KW2-XHE-G'--6.
Reflux Cooling 1n windovv 2
~r-:,xa~
in POS 6 of Refusing RCS l.c,ops l:,olated to eau.., F<1...., of Reflux Co<ing ISO-Wa INSUF A..OW TO 3 SG FRM AT LEAST 1 AFW PUMP LB'i't23 0.,..-ala- FCIM"I FM.URE OF F.AI.. TO Q.OSE to Bleed the SE.Ca-lOARY S!:>E BOlH POR\IS SGs 1 ,jven R3 1£AT REMOWL BB11W23 BBBW23 A-UW2-lll!-B3-l7
Reflux Cooling windo\A/ 2
~~aeo~1 in POS 6 of Refueling RCS Loops lsokrl.od lo Cause Fal\re of Reflux Coding IS0-W2 n-u:w2-mE tlSUF R.OW TO 3 SG FRM AT LEAST 1 AFW PUMP LS1'123 A-n:w2-XBE-Sl-8 Oporalor Failure Fl>JI..URE OF FAR.. TO Q.OSE FAI...URE OF lo Blood lhe SECO-IDARY SIDE BOTH PCR,15 SECO-IDARY SOE SGs 1 given R3 HEAT REMOVAL f£AT REMOWL SSHV1'23 SSHV1'23 A-n:vr2-XHE-S2-8 A-tlrW2-DIE-S3-8
F oilure of Hig.h Pressure Recirculation
,n Window 2 IJ mI
°' u,. '° IJ Ht D-4KW2-XHE A--4KW2->>£-C-1J IJ
Failure of Hig.h Pressure Recirculation
,n Window 2 trlI
~h
°'°' 0 FS\\112H Hl H2
Failure of High Pressure Recirculation in Window 2
-II p-lKW2--{I
-'-41<11'2-lOE-X D-41<W2-l0£ H2 HI D-4l<W2-l01!:
HKW2-XI£ ll'SILG
Failure of High Pressure Recirculation 1n Window 2 111 tI1 I 0\ 0\ lv P,4KW2-VJ P4KW2-"8 D-~-lOE P4KW2NIB ll-4{W2-XI£ A-ll<W2-l0£-C-1! 11\S
Failure Recirculation Spray Window 2 HPR failure loss of HPSH d to open contoirm t trl I C\ C\ w CON-VFC-RP-COREM Foilu-e to Dio<tnose Loss of RHR Event in POS 6 P4ICWeG0-18 D-4KWe-XHE A-4KWe-XHE-P-18 FAURE OF INS[£ FALURE OF OlJTSII PRAY ~CIRCULATIO SPRAY ~CRCULATIO F1LPSD F2LPS0
Failure c:)f Recirculation Spray In Window 2 HPR failure loss of 1-f'SH d e to open contairme CON-VFC-RP-coREM Failire to D"taqnose ~ator F9ilire Loss of RHR Event to Est<bish in POS 6 Reeroulatio n in W1 D--4KW2-XHE A-4KW2-XHE-P--4 FALlH OF NSII FALlH OF OlJTSII
':'f 1£CRCULATIO ':'f 1£CIRCULATIO F1LPSD F2LPSD
Failure of Recirculation
- Spray
- Window 2 HPR failure loss of 1-PSH to open cont<iirm CON-VFC-RP-COREM F<iihre to Dklqnose Loss of RHR Event in POS 6 D-4KW2-XHE A-4KW2-XHE-P-9 FALi.RE OF OUTSII Y ft:CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray Windovv 2-cause HPR failure Foihre to Diognose ~otor F9iltre Loss of RHR Event to Est<t>ish in POS 6 Reci-cukrtio n in W1 D-4KW2-XHE A-4KW2-XHE-P-13 FAURE OF NSlE Y ~CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray
- 1n \Ni ndovv 2-cause HPR f oilure Foil LY e to Di<lg_nose Loss of RHR Event in POS 6 D-4KW2-XHE A-4KW2-XHE-P-18 FAILURE OF INSICE RAY ~CIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray Windovv 2-cause HPR failure tTJ I C\ C\ 00 F<iihre to Dmnose ~<Jtor F c;iihre Loss of RHR Event to Est<illsh in POS 6 Reoroul<rtion in W1 D-4KW2-XHE A-4KW2-XHE-P-4 FALLRE OF NSD=:
':f ~CRCULATIO F1LPSD F2LPSD
- Failure of Recirculation Spray
- In \Ni ndovv 2-cause HPR failure Foiltre to Diog_nose Loss of RHR Event in POS 5 D-4KW~-XHE A4KTI-XHE-P-9 FALL.IRE OF NSO::
Y ftCRCULATIO F1lPSD F2LPSD
Failure of Recirculation Spray 1n Window 2 HPR failure tI1 I 0\ .....:i 0 CON-VFC-RP-COREM Fai11.re to Diaqnose Operator F9iltre Loss of RHR Event to Estabish in POS 6 Reoiroukltio n in W1 P4KWZG0-13 D-4K1ra-XHE
. FALURE OF INS~
SPRAY FI:CIRCULATIO F1LPSD F2LPSD
UNITY I4KW3 H4KW3 R4KW3 S4KW3 F4KW3 SEQ # END-STATE 1 @. 2 @ I I I 3 OK 4 @ I I I I I 5 CD Ii 6 @ i I I I 7 OK 8 @ I I I g CD Event Tree for Loss of 4KV Bus. - W3/D6
UNITY I4-KW3 H4-KW3 R4-KW3 VW3 F4-KW3 G4-KW3 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 CD 5 CD 6 @ 7 CD 8 9 @ 10 CD 11 CD 12 @ 13 CD Event Tree for Loss of 4KV Bus - W3 R10
UNITY I I4KW3 I H4KW3 I R4KW3 I VW3 I F4KW3 I G4-KW3 I SEQ # END-STATE-NAMES 1 @ 2 @ I I 3 4 CD I I I 5 CD I I 6 @ 7 CD 8 @ I I 9 10 CD I I I 11 CD I 12 @ 13 CD l Event Tree for Loss of 4KV Bus - W3; R6
top event for loss of 4KV window 3 DURATION-RIO REfUEl. POS-1110 REfUEl. PRCB-'W3RS PRCB-W311S POS-D6
4KV SYSTEM RECOVERY IN WINDOW 3 trl I C\
-...J Ul tl-tlJ'-DC-93
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 3 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. t'I1 I 0\ -.J 0\
!LURE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-4KW3-XHE-R-3. D-4KW3-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 3 RESTO E RHR GIVEN LO S OF 4-KV MERG BUS IN POS 6 - DR. MT. F !LURE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4-KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-4KW3-XHE-R-9. D-4KW3-XHE
Feed and Bleed the RCS 1n 'Window 3 Foed in! 8'""d tho RCS i, Rlfi3, W"ndcw 1 Fad in! Bleed
- Safatv Vdve I.he RCS i1 Rlfi3, R""""'81f i1 W-ndcw POS 6 cf Refuoing . 1 trl I
0\ BV-W3 -...J 00 FALURE or FEED F,._URE or FEED f,,W SPU. USING >,W SPIJ. USING LPI ff'I FSW34L FSW34B A-*Ut'/1'3-XBE-FL-10
Feed and Bleed the RCS Window 3 Feed aid Bleed the RCS i, ~3. W"ndcw 1 Feed aid Bleed Safelv Vdve tho RCS i, RliR3. Removec( i, Wndcw POS 6 of Refueing 1 Fl>l..URE OF FEED FAILURE OF FEED MO SPLL USING ANO SPU. USING LPI ff! FSW34L FSW34B A-4Dl'3-XBE-FL4 A-4KW3-XBE-FB-4
Feed and Bleed the RCS with V foiled In_ Wi ndovv 3 Feed ond Bleed the RCS in RHR3, POS 6 of Refuenng tI1 I Foilure to Diognose 0\ Loss of RI-R Event 00 in POS 6 0 D-4-KW3-XRE FAURE OF FEED FAURE OF FEED AND SPLL LSING At-0 SPLL LSNG HPI LPI FSW34-H FSW34-L A-4-KW3-XRE-FL-13
Feed and Bleed the RCS with V failed
\Ni ndovv 3 Feed and Bleed the RCS in RHR3, POS 6 of Refuefing Failure to Diagnose Loss of RI-R Event in POS 6 trl
°'- 00 D-4-KW3-XHE FALi.RE OF FEED FAILLRE OF FEED Af>O SPLL USNG AND SPLL USING LPI HPI FSW34-L FSW34-B: A-4-KW3-XRE-FR -7 A--4-KW3-XRE-FL-7
Reflux Cooling windovv 3
~QCo~,
in POS 6 of Refu,,fi,g trl I
°'tv 00 RCS Loops loolaled lo Cao.,,o Fcikro of Reflux Coding IS0-W3 NSUF FLOW TO 3 SG FRM AT I.EAST 1 AfW PUMP LSW23 A-4KW3-XHE-S1~
Op<<-ala- F<Bllre FALURE OF FALTO QOSE to Bleed tho SEC~DAAY SllE BOTH Pa?vS SGo 1 given R3 HEAT REMOVAL SSHW23 SSHW23 A;-4KW3-XHE-S2-4 A-403-XBE-93-4 I. I I
Reflux Cooling windovv 3
~a~
in POS 6 of Refuoli,g RCS Loops hoolalod lo eau.. Fcilura of RefNx Cod"ng IS0-1'3 Operator Faikce NSVF R.OW TO lo Feed SGs i, 3 SG FRM AT LEAST Window ~R3 1 AfW PUMP LSW23 A-UW3-Im!-B1~ ()petal.or FciJo.re F>I.. TO Q.OSE lo Bleod the BOTH PCRVS SGs 1 <jven R3 SSBW23 9Blllf23 A-4.l[ffll-XJl!!-93-8
Gravity from RWST Window 3 Gr<JVitv from RWST in POS 6 of Refueflng Safety V<ilve Removed in Window 1 INSUF FLOW F<iih.re to Di<Jgnoee Tl-'ROUGH LOW HEAD Loss of RHR Event INJECTION FLOW in POS 6 PATH
*D6..:.:CG D-4KW3-XHE .A.-4K'W3-XHE-G-11 I
Gravity from RWST In Window 3 G'"avitv from RWST in POS 6 of Refueflng S<Ifetv Valve Removea in Window 1 SV-W3 INSUF FLOW FailLre to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTK)N FLOW in POS 6 PATH D-4-KW3-XHE A-4-KW3-XHE-G-5
UNITY I4-KW4- H4-KW 4- R4-KW 4- S4-KW4 F4-KW4- . SEQ # END-STATE 1 2 3 OK tI1 4- @ I C\ 00 C\ 5 CD 6 7 OK 8 @ g CD Event Tree for Loss of 4KV Bus - W4/D6
UNITY I- I4KW4 I H4KW4 I R4KW4 I VW4 I F4KW4 I G4KW4 I SEQ # END-STATE-NAMES 1 @ 2 @ I I 3 @ 4 OK I I I 5 CD tr1 I I 6 @ C\ 00 7 CD -.I 8 @ I I 9 10 bK I I I 11 CD I 12 @ 13 CD Event Tree for Loss of 4KV Bus - W4; R10
UNITY I4KW4 H4KW4 R4KW4 VW4 F4KW4 G4KW4 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 OK trl I 5 CD I I 6 @ ~II 7 8 CD i @ 9 10 OK 11 CD 12 13 CD Event Tree for Loss of 4KV Bus - W4 R6
top event for loss of 4KV In window 4 OURATION-R10 REf1JEl. POS-1110 fR'.C-POS10 PROll-'11'4BJ.D DURATION-RS REfUB. P0S-R6 PR0B-'11'4BS OR-MT DtN.mN-os PROB-'11'4DS POS-06
4KV SYSTEM RECOVERY IN WINDOW 4 tp 0\ \0 0
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 4 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. tTl I 0\ IQ F ILURE TO DIAGNO E LOSS OF RHR IN LO S OF 4KV BUS H IN POS'S 3-13 P6 OF DR MT W3-S A-4KW4-XHE-R-3. D-4KW4-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN _window 4 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. trJ I 0\ \0 N F !LURE TO DIAGNO E LOSS OF RHR IN LO S OF 4KV BUS H IN POS'S 3-13 P6 OF DR MT W3-S A-4KW4-XHE-R-9 D-4KW4-XHE
Feed and Bleed the RCS 1n V\/indow 4 Feed and B!o.d tho RCS in ~3, W"r,dc:,,y 1 Food and Bl"8d tho RCS in ~3, POS 6 cf Rofuofing sv-w~ FM.URE OF FEED F>LURE OF FEED AND SPlL USlNG Ml) SPlL USlNG LP1 HPI FBW3~L FBW3~B A-U:W~-XBE-FL-10 A-~ltl'l'~-XBE-FB-10
Feed and Bleed the RCS ,n \Nindow 4 Feed and Bleed the RCS ;, RHRJ. W"llldcw 1 Feed and Bleed Safety Valw the RCS ;, RHR3, Removed in W"ndcw POS 6 of Ref ue[ng 1 sv-w, D-4KW4-XBE F>'JL.URE OF FEED FAl.URE OF FEED AND SPLL USING AND SPlL USING LPI HPI FBW34L A-4KW4-XHE-FL-4 A-4KW4-XHE-FH-4
Feed and Bleed the RCS with V failed 1n
\Ni ndovv 4 Faed and Bleed the RCS in RHR3, POS 6 of Refuenng Failure to Diagnose Loss of RH'l Event in POS 6 D-4-KW4--xm:
FAILLRE OF FEED FAILLRE OF FEED AND SPLL LlS ING AND SPLL LlSI-JG J-IPI LPI FSW34-H FSW34-L A-4-KW4--xm:-FH-13 A-4-KW4--xm:-FL-13
Feed and Bleed the RCS with V foiled Windovv 4 Feed and Bleed the RCS in Rtfi3, POS 6 of Refuefing Failure to Diagnose Loss of RI-R Event in POS 6 D-4-KW4--XBE FAD..LRE OF FEED FALLRE OF FEED AND SPLL l.5NG Af>O SPLL l.5NG I-Pl LPI FSW34-H FSW34-L A-4-KW4--XBE-FH-7 A-4-KW 4--XBE-FL-7
Reflux Cooling 1n windovv 4
~Q~,
in POS 6 of Refuoli,g RCS I.cops looloted to ea.,,., Fcilcro of Reflux Cooing IS0-W4 D-UtW4-XBE ta!F R.OW TO 3 SG FRM AT I.EAST 1 AFW PUMP LSW4 A-4KW4-XBE-B1-4 Operala- F011uro F/.JLURE OF FM.. TO U.05E to *Blood tho SECONDARY SOE BOTH P<RVS SGs 1 given R3 HEAT REM0',1,11.. BSBW4 SBBW4 A-4KW4-XBE-S2-4 A-4ltW4-XBE-B3-4
Reflux Cooling windovv 4
~~:Xo~1 in POS 6 of Rofuolinl)
RCS Loops J,olotod to Cau,o Fal.re of Reflux Coding trl I C\ \0 00 1so-w, D-4KW4-::CHE NSUF R.OW TO 3 SG FRM AT l.£1\ST 1 AFW PUMP Lsw, A-4KW4-XHE-S1-8 Operota- Foiluro Fl>JLURE OF FM. TO QOSE to Blood tho SECCNDARY SOE BOTH PORVS SGs 1 given RJ HEAT REMOV>L BSHW4. SSHW4. A-;4KW4.-XHE-S2-8 A-41[W4.-XHE-B3-8
Gravity- from RWST 1n Window 4 Gravity from RWST in POS 6 of Refueflng Safety Volve Removed in Window 1 INSUF FLOW Foih.re to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTKJN FLOW in POS 6 PATH 1 D5-CG D-4KW4-XHE A-4K~4-XHE-G-11
Gravity. from RWST 1n Window 4 Gravitv from RWST 1n POS 6 of Refuenng tI1 .!..i 0 0 S<Jfety Valve Removed in Window 1 G4ICW-4G2-5 SV-W4 INSLF FLOW FailLre to Diagnose THROUGH LOW f£AD Loss of RHR Event INJECTION FLOW in POS 6 PATH D-4KW4-XHE A-4X:W4-XHE-G-5
- Appendix E.12 Event Trees and High Level Fault Trees for Loss of Vital Bus(VB)
- E-701
UNITY IVBW1 HVBW1 RVBW1 FVBW1 CVBW1 SEQ # END-STATE 1 2 @ 3 @ trJ I
!I 4 CD
-.l ' Ol l-..l I 5 CD I 6 @ i 7 @ I 8 g CD CD Event Tree for Loss of Vital Bus - W1/06
UNITY I IVBW1 I HVBW1 I RVBW1 I VW1 I SVBW1 I FVBW1 I GVBW1 I CVBW1 I SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ I 4 CD ' I 5 CD ' 6 CD ! 7 @ I 8 @ I I 9 CD I 10 CD 11 @ 12 @ I 13 CD I 14 CD 15 CD 16 @ I 17 @. I I 18 CD I 19 CD Event Tree for Loss of Vital Bus - W1/R6
top event for loss of VB window 1 til I ....:i 0 .i:,.. R£f1JEl. POS-R10 PROB-WIRXl DURAT~6 POS-flS PROB-W1R6 OR-MT PR0e-W1D6
VITAL BUS SYSTEM RECOVERY IN WINDOW 1 CCW' BY!TDC RECOV!RY
. CCW 3YBT!M:
RECOVERY IN 1f1 11-VB-lll:C-Wl
RESTORE RHR. GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 1 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT.
!LURE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUSH IN P6 0 P6 OF DR MT W3-S A-VBW1-XHE-R-12. D-VBW1-XHE
RESTORE RHR GIVEN . LOSS OF 4KV EMERGENCY BUS
- H IN window 1 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 -
DR. MT. trl I -...I 0 -...I ILURE TO RESTOR F ILURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-VBW1-XHE-R-3 . D-VBW1-XHE
Feed and Bleed the RCS 1n Window 1 Feed and Bleed the RCS ii RHR3, W"ndcw 1 trl ~ 0 00 D-VBVl'l-XBE F;IJLURE OF FEED F;IJLURE OF FEED AND SPLl. USING AND SPLl. USING LP1 HP1 F9N1l'L A-VBWt-XBE-FL-U A-VBVl't-XBE-FH-U
Feed and Bleed the RCS 1n Window 1 Feed and ~d the RCS in RHR3, Window 1 Food and Bleed Safely Valw the RCS in RHR3, Removed in W-tt1dow POS 6 of Refue~ng 1 SV-Wl D-VBWI-XBE FVBW G3-6 FM.URE OF FEED FAILURE OF FEED AND SPU. USING AND SPL1. US1NG LPI HPI F9N121. F9N12H A-VBWI-XBE-FL-5 A-VBWI-XBE-FH-6
Feed and Bleed the RCS with V failed VVindo. w 1 Feed and Bleed the RCS in RHR3, POS 6 of Refuering Failure to Diagnose Loss of R~ Event in POS 6 tI1 I -..J 0 FVBW!VG0-10 D-VBW1-XEE FAll.RE OF FEED FAft..LRE OF FEED AND SPLL I.EING AND SPLL I.EING HPI LPI FSW12H FSW12L A-VBW 1-XHE-FB:-10 A-VBW1-X1IE-FL-10
Feed and Bleed the RCS with V foiled 1n VVindow 1 Feed and Bleed. the RCS in RHR3, POS 6 of Refuefing Failure to Diagnose Loss of RI-R Event tT1 I in POS 6 -...J FVBW!YG0-19 D-VBW1-XHE FAURE OF FEED FALLRE OF FEED AND SPLL LSING AND SPLL LSING HPI LPI FSW12H FSW12L A-VBW1-XHE-FR-19 A-VBW 1-XHE-FL-19
Reflux Cooling 1n windo'N 1 RCS Loops Isolated lo Cau"" Fa,luro of Reflux Cooling ISO-W1 D-VBWl-XBE INSUF FLOW TO 3 SG FRM AT LEAST
- 1 AfW PUMP LSW1 A-VBWl-XBE-Sl-17 Operala- Failure FM.URE OF F/>l.. TO Q05E lo Bleed the SEC~o.<.RY SOE BOTH PQR,/S SGs 1 given R3 !£AT REMOVl,l.
SSHW1 SS1ttV1 A.,-VBWl-XBE-S2-l7 A-VBWl-XBE-B3-l7
Reflux Cooling window 1 t~.~~~ in POS 6 of Refueling RCS Loops loolaled lo eau .. Faoho of Reflux Cooling ISO-W1 D-VBW!-XBE Oporali:r Failuro INSUF FL.OW TO lo Feed SGs in 3 SG FRM AT LEAST Window 1-R3 1 AFW PUMP LSW1 A-VBWI-XBE-S 1-8 Operali:r Failuro FM.URE OF FM. TO QOSE Fl>JLURE OF lo Blood lho SECO>lCIARY StDE BOTH PCR\IS SECOND.ARY SIDE SG, 1 given R3 HEAT REMOVAL. HEAT REMOVAL. SSHW1 SS~V1 A-;-VBW1-XBE-B2~ A-VB'll'1-XBE-S3~
GrcJvity from RWST 1n Window 1 Gr<JVitv from RWST 1n POS 6 of Refuefing Safety Valve Removed' 'in Window 1 SV-W1 INSUF FLOW Failure to Dkignose THROUGH LOW HEAD Loss of RHR Event INJECTON FLOW 'in POS 6 PATH 1
, D6*.:...cG D-VBW1-XHE A-V.BW!-XHE-G-15
Gravity from RWST Window 1 Gravitv from RWST 1n POS 6 of Refuering S<Jfety V<ilve Remove<! in Window 1 GVBWlG~-6 SV-W1 INSU:- FLOW F<iih.re to Di<lqnose THROUGH LOW HEAD Loss of RHR Event IN.ECTION FLO/!' in POS 6 PATH D-VBW1-XHE A-V.BW1-XHE-G-6
Failure of High_ Pressure Recirculation 1n Window 1 H1 H2 PT"B'1'J'1-U PTrffl'1-U I ;£ 11',S I I if11'.Sll.G I Cf'affiQ!!-13 =12 ISRC lRIAY fflffl'U'13 I i i A-T'lnt'1-XH!-C-L! D-Y!11'1'1~tl!I 11',S 11',SJl.G A-\<Bf/1-XHE-<:-1l
- D-wtn-XHE A-ll!M1-XHE-<:-1l D-Win-XHE
Failure of High Pressure Recirculation 1n Window 1 trl
-~ E5t-11 ~ I
'ff-Wl CT'A' 1-1 I 'tiI C'l'B!f
~
I -...J __J -...J H1 H2
~
PT'll'lrl......
~ I 04 ~ 'I' ~
I I I I l<EKT I I I IER<l >mAY z1 1z:1, 11'.S 11'.SlLG I cn1rl.Gll4 \IEl!l\.12 I l'l"Bllr4 J..~Tlffl'l-::CHl!I-C--4 D-Tlffl'l-J:.tm I I ;;: I 1;:: 11'.S IIIS!LG A-\iMH<HE-<H o--mXHE A-W!f1-Xl£-<:-4 D--'9!M1-XHE
Failure of High Pressure Recirculation 1n Window-1 _;, I I _;, .Ii tI1 I ~ -..J 00 H1 H2 PJ'Wll'L-UI ...... -:'" ff1'1'1'1-1D Wl1 I
- 2 it H',S I
H'.SII.O I PrftU'UI
&-T'ffll'l-Xllll-C-UJ D-Tni-il:El!I A--1-XHE~-1' 0--1-lCHE
;: i HAS H'.SII.O
Foilure of High Pressure Recirculot ion 1n Window 1
-~*
H1 ffD11'1-lill """1-lil \M1 lffi TO HOT LEG 11'.S 11'.SILG 'iENlL'IZ PT'Dll'll'U 2 1.-Tn'i-::ttm-C-lill D-Tff1-J:Hll I 11'.S 11'.SILG A-\lM1-XHE-C-9
Failure of Recirculation Spray Window 1 HPR failure loss of 1-PSH d to open contairm t PVBWl0-13 CON-VFC-RP-CORE~ Failire to Diaqncse ~ator F9ihre Loss of RHR Event to Estd:>!sh in POS 6 Recrculation in W1 D-VBW1-XHE A-VBW!-XHE-P-13 FALURE OF NSCE FALURE OF OUTSCE RAY RECRCULATIO PRAY RECRCULATIO F1LPSD F2LPSD
Foilure of Recirculation Spray 1n Window 1 HPR failure loss of 1-PSH d e to open contoinme t trJ I -...J tv PVBWl0-18 CON-VFC-RP-COREM Foiltre to Diog_nose Loss of RHR Event in POS 6 PVBW!G0-18 D-VBW1-XHE A-VBW!-XHE-P-18 FAIURE OF i'lSr.£
':'f ~CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray 1n Window 1 HPR failure loss of 1-FSH d e to open ¢0ntoirrn CON-VFC-RP-COREM Foilu-e to Dioqnose ~rotor F<;iiltre Loss of RHR Event to Estob!sh in POS 6 Recrcukrtio n in W1 D-VBlr!-XHE .A-VBl\"1-XHE-P-4 FALL.IRE OF INSll: PRAY RECIRCUL.ATIO F1LPSD F2LPSD
Fa,lure of Recirculation Spray
- Window l HPR failure loss of 1-PSH d e to open contoirme t CON-VFC-RP-COREM Foihre to Dioqnose Loss of RHR Event in POS 6 D-VBW1-XHE A-VBW!-XHE-P-9 FALLRE OF OUTSL'E RAY F£CRCULATIOI F1LPSD F2LPSD
Failure of Recirculation Spray ,n 'Ni ndovv 1-_ couse HPR f oilure Failure to Diag_nose ~ator Failure Loss of RHR Event to Estabish in POS 6 Recirculation in W1 D-VBW1-XHE A-VBWi-XHE-P-13 FAl~ OF NSCX:: RAY ~CIRCULATIO F1LPSD F2LPSD
Failure of *Rec ire u lat ion Spray 1n 'Ni ndovv 1-cause HPR failure Faihre to Di<l<l_nose Loss of RHR Event in POS 6 D-YBW1-XHE A-YBW1-XHE-P-18 FAll.JRE OF tlSt'E FALURE OF OVTS1C£ Y FECIRCULATIO RAY FECIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray 1n 'Ni ndovv 1-cause HPR failure tl1 I -..J l...:l °' Foiltre to Di<Jg_nos,e Loss of RHR Event in POS 6 D-VBW1-XHE A-VBWi-XHE-P-4 FAILURE OF NSU: RA.Y ltCIRCULATIO F1LPSD F2LPSD
- Failure of Recirculation Spray
* ,n 'Ni ndovv 1-cause HPR failure Fa.Hur" of R"oirculation Spray in F<iiltre to Dkiqnose Loss of RHR Event in POS 6 PVBW1NG1-9 D-VBW1-XHE A-VBW1-XHE-P-9 FALURE OF INSICE FALURE OF OUTS[
PRAY ~CIRCULATJO Y ~CRCULATJO F1LPSD F2LPSD
UNITY IVBW2 HVBW2 RVBW2 SVBW2 *FVBW2 CVBW2 SEQ # END-S 1 @ 2 @ 3 OK 4 5 CD 6 CD 7 @ 8 OK 9 10 CD 11 CD Event Tree for Loss of
- Vital Bus - W2/D6
UNITY I IVBW2 I HVBW2 I RVBW2 I VW2
- 1 SVBW2 I FVBW2 I GVBW2 I CVBW2 I SEQ # END-STATE-NAMES 1 @
2 @
- 3 @
I 4 CD I 5 CD 6 CD 7 @ I 8 @ I I 9 CD I 10 CD 11 @ 12 @ I 13 CD I 14 CD 15 CD 16 @ I 17 @ I I 18 CD I 19 CD Event Tree for Loss of Vital Bus - W2/R6
top event for loss of VB window 2 trJ I -...J w PRBQ-VB 0 DUR4TION-R10 REfUEl. PDS-R10 'C-POS10 PROB-'W21Ull DlJR'.TION-RS REfUa POS-RS PR0B-'W2R~ DR-MT IXJRll.TIOt-1-DS PROB-W2D~ POS-06
VITAL . BUS SYSTEM . RECOVERY IN WINDOW
- 2 CCW SYSTDI IIECOVEltY CCW STSTIIM RIICOVJ:RY IN Wi H-VB-RIC-'lf2
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS HIN window 2 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. trJ I --.J vl l-.l F ILURE TO DIAGNO E LOSS OF RHR IN LO S OF 4KV BUS H IN POS'S 3-13 P6 OF DR MT W3-S A-VBW2-XHE-R-12. D-VBW2-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 2 RESTO E. RHR GNEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. trl I -..J 1.,J 1.,J
!LURE TO RESTOR F !LURE TO DIAGNO E
- LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-VBW2-XHE-R-3' D-VBW2-XHE
Feed and Bleed the RCS 'Window 2 Food and B!..,d tho RCS in RHR.3, W-l!ldow 1 Feod and Bleed Safety Vave tt., RCS in RHR.3. Removed in W"ndow POS 6 of Refueling 1 D-VB11'2-XBE F/IJLURE OF FEED FALURE OF FEED Af'll SPLl. USING ANO 5PU. USING LPI HPI F9N12L F9N12H A-VBW2-XBE-FL-U A-VBW2-XBE-FB-U
Feed and Bleed the RCS 1n \/Vindow 2 Foed and Bleed lhe RCS i, Rlfl3, W"llldow 1 Foed and B!oGd Safely Vdive the RCS i, Rlfl3, Romoved i, W"ndow POS 6 of Refueling 1 sv-wz D-VBWZ-XIIE FM.URE OF FEED FM..l.lRE OF FEED AND SPU. USING AND SPU. USING LPI ffl F9N121. F9N12H A-VBWZ-XBE-FL--6 A-VBWZ-XBE-f'll-6
Feed and Bleed the RCS with V failed 1n
\Ni ndo \/'I *2 Feed and Bleed the RCS in RHR3, POS 6 of Refueflng Failure to Diagnose Loss of RI-R Event in POS 6 FVJ3W2VG0-10 D-VBW2-XHE FAILLRE OF FEED FA!..LRE OF FEED AND SPLL LGING AND SPLL LSNG HPI LPI FSW12H FSW12L A-VBW2-XJIE-FJI-10 A-VBW2-XJIE-FL-10
Feed and Bleed the RCS with V foiled
\Ni ndov; 2 Feed and Bleed the RCS in RHR3, POS 6 of Refuefing Failure to Diagnose Loss of RI-R Event in POS 6 FVBW2VG0-19 D-VBW2-XRE FAURE OF FEED FALL.RE OF FEED AND SPLL USING Af'O SPLL IBNG HPI LPI FSW12H FSW12L A-VBW2-XRE-FR-19. A-VBW2-XRE-FL-19
Reflux Cooling windovv 2
~:~a~1 in POS 6 of Refueli,g RCS Loops loolaled lo ea.... Fcil\ro of Reflux Cocing IB0-W2 D-VBW2-XBE NSUF A...OW TO 3 SG FRM AT LEAST 1 AFW PUMP LSW23 A-VBW2-XBE-S1-17 FM.URE OF FAI... TO Q.OSE oro'"°it';;,l~;':* SECCNOARY S!)E BOTH Pc<<vS SGs 1 ,jven R3 IEAT REMOWl SSBW23 S9HWZ3 A-VBW2-mE-S2-17 A-VBW2-xm:-93-17
Reflux Cooling 1n windovv 2
~~*a~~
in POS 6 of Refueling RCS Loops lsolaled lo Cau,a Fa,luro of Reflux Coding IS0-W2 D-VBW2-lCllE LSW23 A-VBW2-XBE-S1-8 Ope.ala- Faluro FAI..URE OF FAI.. TO Q.OSE lo Bleed lho SECONO/>RY SIDE BOTH PCR\15 SG, 1 given R3 HEAT REMOV/IJ.. SSHW23 PORVt- .. SSBW23 A-VBW2-XBE-S2-8 A-VBW2-XBE-B3-8
Gravity from RWST 1n Window 2 Gr<JVitv from RWST in POS 6 of Refuenng Safety Volve Removed in Window 1 sv-we INSUF FLOW Foihre to Dioqnose THROUGH LOW HEAD Loss of RHR Event INJECTYJN FLOW in POS 6 PATH 1
,06.-CG D-VBWe-XHE A-VBWe-XHE-G-15
Gravity from RWST ,n Window 2 Gravity from RWST in POS 6 of Refueling S<Jfety Valve Removed in Window 1 sv-we INSUF FLOW Faih.re to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTKJN FLOW in POS 6 PATH
.D5-CG D-VBWi?-XHE A-VB'lfi?-XHE-G-6
Failure of High Pressure Recirculation in Window 2 M1 112
Failure of High Pressure Recirculation In Window 2
-1
~in H2 Wlll.12
F oilure of High Pressure Recirculation in Window 2 00-13 fN..J/12 B F"S\VtlH A-V~-Xt£-C-U A-V6W2-XtE-C-tJ ran.,.. to 01.,..... LOEBinDf~llCVfflt Pl'BW2-1J H1* D--VB'/12-XIE A-"8W2-XHE-C--13
F oilure of High Pressure Recirculation In Window 2 00-ta 18 B A-V6W2-XH~-X A-VBw.Z-Xt£-C-18 ft! H1 HAS D-VB'112-X1£ A-VBW~-XHE-C-IB P\IIIW2N1B
Failure of Recirculation Spray Window 2 HPR failure loss of 1-PSH d to open contoirm t trl ..'.J CON-VFC-RP-COREM ~ °' Foihre to Dioqnose ~otor FQih.te Loss of RHR Event to Estobish in POS 6 Recrculotion in W1 D-VBW2-XHE A-VBW2-XHE-P-4 FAURE OF OUTSIE Y F£CRCULATIO F1LPSD F2LPSD
Fa,lure of Recirculation Spray ,n Window 2 0 HPR failure
- I loss of 1-PSH d to open oontairrn CON-VFC-RP-COREM Failtre to Diaqnos,e Loss of RHR Event in POS 6 D-VBW2-XHE A-VBW2-XHE-P-9 F1LPSD F2LPSD
Failure Recirculation Spray 1n Window 2 HPR failure loss of HPSH d e to open oontainme t CON-VFC~RP-COREM FailLre to Diaqnose Loss of RHR Event in POS 6 PVBWl?G0-13 D-VBW2-XHE A-VBW2-XHE-P-13 FAUJRE OF INS!a:: SPRAY FI:CIRCULATIO F1LPSD F2LPSD
- Failure Recirculation Spray
- Window 2 HPR failure
- loss of HPSH d e to open contairrne t CON-VFC-RP-COREM Failtre to Diaqnose Loss of RHR Event in POS 6 PVBWZG0-18 D-VBW2-XHE A-VBW2-XHE-P-18 FAURE OF NSrE FALURE OF oursre:
RAY RECRCULATIO SPRAY RECIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray In Windovv 2-cause HPR failure Foiltre to Di~nose ~otor F9iltre Loss of RHR Event to Estooish in POS 6 Recrculotio n in W1 D-VBW2-XHE A-VBTf2-XHE-P-4 FAL~ OF OUTSll: PRAY F£CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray 1n 'Ni ndovv 2-cause HPR failure Failtre to Diag_nose Loss of RHR Event in POS 6 D-VBW2-XHE A-VBW2-XHE-P-9 F1LPSD F2LPSD
Failure of Recirculation Spray 1n Windovv 2-cause HPR failure Faih.re to Dioqoose Loss of RHR Event in POS 6 D-VBW2-XHE A-VBW2-XHE-P-13 F1LPSD F2LPSD.
- Failure of Recirculation Spray
- 1n 'Ni ndovv 2-cause HPR failure Failtre to DiagJ10se Loss of RHR Event
- in POS 6 D-VBlfe-XHE A-VBWe-XHE-P-18 FALURE OF tlSO: FALURE OF OLJTSl!l::
RAY ~CIRCULATIO Y ~CIRCULATIO F1LPSD F2LPSD
UNITY IVBW3 HVBW3 RVBW3 SVBW3 FVBW3 SEQ # END-STATE 1 @ 2 3 OK tli @ I --l 4 VI .I>,. 5 CD I 6 @ 7 OK 8 g CD Event Tree for Loss of Vital Bus - W3/D6
UNITY I IVBW3 I HVBW3 I. RVBW3 I VW3 I FVBW3 I GVBW3 I SEQ # END-STATE-NAMES 1 @ 2 @
- J @
I I 4 CD I 5 CD I 6 @ 7 CD 8 @ 9 @ I 10 CD I I 11 CD I 12 @ 13 CD Event Tree for Loss cif Vital Bus - W3; R10
UNITY IVBW3 HVBW3 HVBW3 VW3 FVBW3 GVBW3 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 CD 5 CD 6 @ 7 CD 8 @ 9 @ 10 CD 11 CD 12 @ 13 CD Event Tree for Loss of Vital Bus - W3 R6
top event for loss of VB 1n window 3 tI1 I -.J Vt -.J DUAATIOt-1-RlD REfUfi. POS-R10 fAAC-P0510 PH0B--"W3R1D DUAATIOl+-R6 REfUfi. POS-RS Pll0B-W3R~ DR-MT DlJR.'.TIOt-1-06 Pll0B--W3D~ P05--D6
VITAL BUS SYSTEM RECOVERY . IN WINDOW 3 CClf Sl'STEII IIECOVJ!RT t1i I -..J U\ RV '11'3 00 CCW' Sf9TEII llCOVEII.Y Ill Wl
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window* 3 RESTO E RHR GNEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. F IL URE TO RES TOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF '4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-VBW3-XHE-R-3 D-VBW3-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN win-dow 3 RESTO E RHR GNEN LO S OF 4KV MERG BUS IN POS 6 . - DR. MT. tI1
~
- 0\
0 F !LURE TO DIAGNO E LOSS OF RHR IN LO S OF 4KV BUS H IN POS'S 3-13 4 P6 OF DR MT W3-S A-VBW3-XHE-R-9. D-VBW3-XHE
Feed and Bleed the RCS 1n Window 3 Feed and lhed tho RCS i i ~ Wnlow 1 Find and 118ed the RCS ii ~3, POS 6 of Rofuefing BV-W3 tri I -.] °' D-B1W3-Xlll: FAA.URE OF FEED F>LURE OF FEED AND SPLL USING AND SPLL USING LPI HPI A-VBW3-XHE-FL-IO A-VBW3-mE-rH-lO
Feed and Bleed the RCS \/vi ndow 3 Feed and Bleed lhe RCS in RHR3, Waidow 1 Food and Bleed Safely Vrive the RCS in ~3. Removed in W11dow POS 6 <>f Refueling 1 SV-W3 D-VBW3-XBE F.NLURE OF FEED F/>LURE OF FEED
- AND SPLl. USING AND SPLl. USING LP! HP!
A-VBW3-XBE-FL---4 A-VBW3-XBE-FB-*
Feed and Bleed the RCS with V foiled 1n
\N1 ndovv 3 Feed and Bleed the RCS in RHR3, POS 6 of Refueling Failure to Diagnose Loss of RI-fl Event in POS 6 D-VBW3-XRE FAILLRE OF FEED FAILLRE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34-H FSW34-L A-VBW3-XHE-FH-J3 A-VBW3-XHE-FL-J3
Feed and Bleed the RCS with V foiled Windovv 3 Feed and Bleed the RCS in . Rffl3, POS 6 of Refuering Failure to Diagnose Loss of RI-R Event in POS 6 D-VBW3-XHE FALL.RE OF FEED FAURE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34-R FSW34-L A-VBW3-X:S:E-FR-7 A-VBW3-X:S:E-FL-7
Reflux Cooling 1n windovv 3 Reflux Cooling Given a RHR3 in POS 6 of Refueling RCS Loo~ l,olcled tTl I lo eou.. Failure --.J of Reflux Cocling C\ V, IS0-W3 D-VBW3-::CHE INSUF Fl.OW TO 3 SG FRM AT L.E:AST 1 AFW PUMP LSW23 SVBW G3-4 A-VBW3-XHE-81-4 Operolc<" Foilu-o FM...URE OF FM.. TO QOSE lo Bleod tho SECONDAAY SIDE BOTH PCRvS SGs 1 given R3 HEAT REMOVAL. 8SHW23 PORv1 SSJIW23 A-VBW3-XHE-B2-4 A-VBW3-XRE-S3-4
Reflux Cooling 1n w indovv 3
§~~':.xa~~3 in POS 6 of Rofueli,g Fciluro lo Diognoso RCS Loops Isolated Loos of RHR Event lo Cause F<>l.ro in POS 5 of Reflux Coc.1111 IB0-W3 D-VBW3-XBE LS\11'23 A-VBW3-XBE-B1--3 Operator Failure FA'I..URE OF FN..TOQOSE lo Bleed tho S£CCJ>jQARY S1DE BOTH PCR\15 SGs 1 given R3 !£AT REMOV>I..
SSBW23 PORv1 BSBW23 A-VBW3-XBE-B2-8 A-VBW3-XBE-B3-8
Gravity from RWST ,n Window 3 Gravity from RWS'r ,n POS 6 of Refuefing Sofety Valve Removed in Window 1 SV-W-3 INSUF FLOW Failtre to Diaqnose Tl-ROUGH LOW HEAD Loss of RHR Event
*1NJECTK)N FLOW in POS 6 PATH D-VBW-3-XHE A-VBW-3-XHE-0-11
Gravity from RWST Window 3 Grovitv from RWST in tT1 POS 6 of Refuering I -...J 0\ 00
. Safety V<1lve Removed in Window 1
INSLf FLOW F<1ih.re to Diognose THROUGH LOW HEAD Lose of RHR Event INJECTION FLOW in POS 6 PATH 1 D6-CG* D-VB\Y'3-XHE A-VB'1f3-XHE-G-5
UNITY IVBW4 HVBW4 RVBW4 SVBW4 FVBW4 SEQ # END-STATE I 1 @
- 2 @
I
.I I 3 OK 4 @
I I I 5 CD 6 @ I I I 7 OK 8 @ I I I g CD Event Tree for Loss Of Vital Bus - W4/D6
UNITY IVBW4 HVBW4 RVBW4 VW4 FVB\V4 GVBW4 SEQ # END-STATE-NAMES 1 2 3 @ 4 OK 5 CD trl @ .!.J 6 -..J 7 CD 0 8 @ 9 10 OK 11 CD 12 @ 13 CD Event Tree for Loss of Vital Bus - W4 R10
~---L-------..J*
UNITY I IVBW4 I HVBW4 I RVBW4 I VW4 I FVBW4 I GVBW4 I SEQ # END-STATE-NAMES 1 @ 2 I I 3 4 OK I I I 5 CD I 6 @ 7 CD 8 @ I I 10 g @ OK I I I 11 CD I 12 @ 13 CD Event Tree for Loss of Vital Bus - W41 R6 L
top event for loss of VB window 4 PIIBQ-VB DUR6.TIDH-RIO REFU!J. PDS-RIO FRAC-PDSIO PROB-"11'-iRlD CXJRATJOH-R6 REF1JEl. PDS-R6 PR0B-"ll'-iR5 DIN.TIOH-06 PROB-"11'-il>l!
VITAL BUS SYSTEM RECOVERY IN WINDOW 4. CCW IIYSTBM RBCOV!:RT IN 11'1 H-YB-ltl!C-W~
RESTORE . RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 4 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. IL URE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4K BUS H IN P6 0
- P6 OF DR MT W3-S A-VBW4-XHE-R-3* D-VBW4-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 4 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. ILURE TO RESTOR F ILURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-VBW4-XHE-R-9 D-VBW4-XHE
Feed and Bleed the RCS ,n 'Nindow 4 Foed and Bleed the RCS i, RHR3. Wndcw 1 Feed and Bleed the RCS i, RHR3. POS 6 of Rofueing ev-w, D-VBW,-XHE F/>JLURE OF FEED F/>JLURE OF FEED AND SPLL USING AND SPLL USING LPI HPI FSW3,H A-VBW,-XHE-FL-10
Feed and Bleed the RCS 1n Window 4 Food and Bleed lho RCS in RHR3, Windc,,v 1 Feod and Blood Safely Volw lhe RCS in RHR3, Rom.,.,ed in Window POS 6 of Refueling 1 trJ I -...J -...J -...J D-VBW4-XHE FAILURE OF FEED FAILURE OF FEED AND SPLL USING AND SPLL USING LPI HPI FSW34L FSW34H A-VBW4-XHE-FL-4 A-VBW4-XHE-FH-,
Feed and Bleed the RCS with V foiled ,n Wi ndo\/\1 4 Feed and Bleed the RCS in RHR3, POS 6 of Refueling Failure to Diagnose Loss of R~ Event in POS 6 F\7BW4-VG0-13 D-VBW4--XBE FAB..~ OF FEED FAL~E OF FEED AND SPLL LSING ANO SPLL LSNG HPI LPI FSW34-H FSW34-L A-VBW 4--XEE-FH-13 A-VBW4--XBE-FL-13
Feed and Bleed the RCS with V foiled
\N i nd-o '0/ 4 Feed ond Bleed the RCS in Rl-fl3,
- POS 6 of Refuering Failure to Diagnose Loss of RH'l Event in POS 6 D-VBW4--XHE FAILLRE OF FEED FALLRE OF FEED AND SPLL I.EING At-0 SPU LE NG HPI LPI FSW34-H FSW34-L A-VBW4--XHE-FH-7 A-VBW4--XBE-FL-7
Reflux Cooling ,n windovv 4
~~~:.c~i in POS 6 of Rofueling trl
~ F01lure lo Diagnooo RCS Loops Isolated 00 Los* of RHR Evonl lo Cau"" Fa,11.ro 0 in POS 5 of Reflux Coding INSUF FLOW TO 3 SG FRM AT LEAST 1 AFW PUMP Operala- Fa,lure FM.URE OF FAH.. TO QOSE FAH..URE OF lo Bleed lho SECCNCl.'RY SIDE .BOTH PCRVS SECCNDAP.Y SOE SG, 1 given R3 HE"AT REMOV/\L HE"AT REMOV/\L POR>/1 SSHW~
I Reflux Cooling 1n windovv 4
~;:,xac~"3 in POS 6 of Rof<mng Faiuro lo Diagno** RCS Loops l,olaled Lo.. of RHR Event lo C<JU.. Failur*
in POS 5 of Reflux Coding 190-11'4 D-VB1'1'4-XHE INSUF R..OW TO
.3 SG FRM AT LEAST 1 AFW PUMP LS1'1'4 A-VB1'1'4-XHE-Sl-8 Operala- Failure FM.URE OF FM. TO Q.OSE lo Bleed lho SECCJ-ICl'.RY SOE BOTH PCJlVS SG, 1 given R.3 HEAT REMOVAL BSHW4 POR.'1 SSBW4 A-VBl'l'4-XBE-B2-8 A-VBW4-XBE-S3-8
Gravity from RWST Window 4 Q-ovitv from RWST in tI1 POS 6 of Refuefing I -...J 00 tv S<Jfetv Valve Remove<( in Window 1 SV-W INSUF FLOW Failtre to Diaqnose Tl-ROUGH LOW f£AD Loss of RHR Event INJECTK:>N FLON in POS 6 PATH D-VBW-4--XHE A-VBW4-XHE-G-11
Gravity from RWST Window 4 Gravity from RWST in POS 6 of Refuefing S<:ifety V<ilve Removed in Window 1 GVBW4Ge-5 SV-W4 INSUF FLOW F<iiltre to Dk1qnose THROUGH LOW HEAD Loss of RHR Event INJECTDN FLOW in POS 6 PATH D6-:CG D-VBW4-XHE A-VBW4-XHE-G-5
Appendix E.13 Event Trees and High Level Fault Trees for Spurious Safety Injection Signal(SI) E-784
- UNITY ISIW 1 HSIWl RSIWl FS1W1 CS1W1 SEQ # END-STATE 1 @
2 @ 3 @ I I I 4 CD tT1 I -...J I 5 CD 00 VI 6 @ 7 @ I I I 8 CD I g CD Event Tree for Spurious SI - W1/D6
UNITY ISIWl HSIWl RSIWl VWl SSIWl FS1W1 GSIWl CSIWl SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 CD 5 CD 6 CD 7 @ 8 @ 9 CD 10 CD 11 @ 12 @ 13 CD 14 CD 15 CD 16 @ 17 @ 18 CD 19 CD Event Tree for Spurious SI - W1/R6
top event for loss __ of SI 1n window 1 PRBC.-SI DUR<\TIO~R1D REfUa P0S-R10 FMC-POS10 PROB->//1R10 DURATIO~RB REfUa P0S-R6 PROB--W1R6 DR-IJT OIJR.6.TI00-06 PROB->//!06 POS-OS
SI SYSTEM RECOVERY IN WINDOW 1 t!1 I -...J 00 00 CC,, RTSIH IBCormtr II' W1
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H
- IN window 1 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 -
DR. MT. tI1 I -..l 00 \0 IL URE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-SIW1-XHE-R-12. D-SIW1-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 1 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. tT1 I -..J \t:) 0 F ILURE TO RESTOR F ILURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4K BUS H IN P6 0 P6 OF DR MT W3-S A-SIW1-XHE-R-3 D-SIW1-XHE
Feed and Bleed the RCS 1n Window 1 Feed and Bleed the RCS i, RHR3, W"l!ldow 1 Feed and Bleed Safely Valve lhs RCS in RHR3. Removed i, Wl!ldow POS 6 of RefueITng 1 D-SIWI-XBE F.AJLURE OF FEED F.AJLURE OF FEED AND SPLL USING ANO SPLL USING
.LP! HP1 F9N12H A-SIWI-XIIE-FL-U A-SIWI-XBE-Fll-U
Feed and Bleed the RCS Window 1 Feed and Bleed the RCS ii RfR3, Wndow 1 Foed and Bloed Safelv Vava the RCS ii RIR3. R""1QVO(f i, Wndow PCS 6 cf Rofueing 1 BY-Wl D-enn-XBE Fl>l.URE OF FEED FALURE OF FEED AND SPU. USING AND SPlL USING LPI -H'I F9N12L F9N12H A-BIWl-XBE-f'L-6 A-Bl'Wl-XBE-f'B-6
Feed and Bleed the RCS with V foiled 1n
\Nindow 1 Fl!ed and Bleed the RCS in Rtfl:3, POS 6 of Refueflng Failtre to Diagnose Loss of RI-R Event in POS 6 D-SIWJ-XHE FAR..LRE OF FEED FAURE OF FEED AND SPLL LSING AND SPLL LS NG HPI LPI FSW12H FSW12L A-SIWJ-XB'.E-,-P'R-10 .A.-SIWJ-XHE-FL-10
Feed and Bleed the RCS with V failed ,n
\Nindow 1 Feed and Bleed the RCS in Rlfl3, POS 6 of Refuering Failure to Diagnose Loss of RI-R Event in POS 6 D-SIW1-XHE FAURE OF FEED FALL.RE Cf" FEED AND SPLL LSING At-0 SPLL LS ING HPI LPI FSW12H FSW12L A-SIW1-XHE-FH-19 A-SIW1-XHE-FL-19
Reflux Cooling window 1 Reflux Cooling Given a RHR.3 in POS 6 of Refueling FoDure to Diognose RCS Loop, laolaled Lee, of RHR Evenl lo Cau,e Fciluro in POS 6 of Roflux Cooling ISO-W1 D-S1W1-XBE INSUF FLOW TO
.3 SG FRM AT LEAST 1 AFW PUMP LSW1
.A-SIWI-XBE-91-17 OperalC<" Failure FAJLURE OF FAJL TO QOSE lo Bleed lho SECCN D.ARY SIDE BOTH PCRVS SG, 1 given R.3 HEAT REMOVAJ... SSHW1 PORv1 SSHW1
.A-SIWI-XBE-82-17 .A-SI7l'l-XBE-S3-17
Reflux Cooling windo N 1 1
=.~,
in PCS 6 of Refueling Failure to Diagnose RCS Loops laolated Loss of RHR Event to ea.,,. Fabe in PCS 5 of Reflux Cooli1111 15~1 D-SIWI-XBE NSUF fl.ON TO 3 SG FRM AT LEAST 1 AFW PUMP LSW1 A-BIWI-XBE-Sl-8 Operator Faiklre FA'LURE OF F>l.. TO Q.OSE to Bleed th9 SECCND.4RY SOE BOTH f'CR\15 SGs 1 given R3 1£AT REMOV>I.. SSHN1 A-SIWI-XBE-BZ-8 A-BIWl-ZBE-B3-8
GrcJv1ty from RWST 1n Window 1 Grav1tv from RWST 1n POS 6 of Refuering S<Jfety Valve Remove<l in Window 1 GSl\f!Ge-15 SV-\f1 INSUF FLOW Faihre to Diaqnose Operator Faih.re THROUGH LOW HEAD Loss of RHR Event to estoorish INJECTION FLCW in POS 6 gav\tY feed PATH 1n window 1 D-SI\f1-XHE A-SI\fi-XHE-G-15
GrcJvity RWST Window 1 Gravity from
. RWST in POS 6 of Refuefing tI1 I
-..J IQ 00 S<lfetv V<ilve Removed' in Window 1 SV-W1 INSUF FLOW F<iihre to Dkiqnose THROUGH LOW*HEAD Loss of RHR Event INJECTION FLOW in POS 6 PATH 1 D5.,::CG D-S1W1-XHE .A-SIW!-XHE-G-6
Failure of High Pressure Recirculation 1n Window 1 ___r:: caW-u
,~~~L, I ~:
- i_
FWL CBQU tr! ~ .!.i '°'° H1 H2 P!ffl'1-1! Pl!lffl'l-U W/1 IECRC lmAY 11'.S 11'.SILG \/Ellll1Z Pllnt't.a'lS A-lll1'1-xtm-C-13 D-!111'1-%111 __c: ::::J._ A-S111-Xl£-<:-fl D-S111-XI£ z11'.S z 11'.SILG A-S111-X1£-<:-fl D-S111-XI£
Failure of High Pressure Recirculation 1n Window 1 I
-~
1-:t1 I _Q z tr1 IIISUF flQW FM I
. ~'!1JJ&.r
~ 0 H1 H2 P!ll91-I canr a-1 PdlW1-I Wl1 I f f IECRC S'1AY FdlLR to 01f'GIII) Lo=-"tn~ :¥Crt I I HAS 11'.S!LG \Ellll.12 P8191a'4. i 2
.1.-Blffl.-:ItlB-C--4 D-1!1111'1.-XIIB F~:J°Jl~
1n POS G
~J*B~
1n POS e 11'.S 11'.SILG A-SW1-XIE-<:-I D-SW1-XIE A-SW1-XIE-<:-I D-SW1-XIE
F oilure of High Pressure Recirculation 1n Window 1 tr1 I ~ 1NSUF Fl.OW FM W'~IBcr INSUF Fl.OW FRM M1~cl:l.f'Jd~
-~*
aHur* af R*alrculatir:i Spray ln Wlndaw 1 1J.. I WElY Vl'LVES NOT REM0\.1aD z
-~.
~ H1 H2 FSll'fl-18 FS!Wl-18 VW1
\IENfL12 FSl'lfllU8 A-9IW1-Xlll:-C-18 D-Sll'fl-Xlll:
HASfLG A-Sf,1;1-XH£-C-15 D-Sr+11-XH£
Failure of High Pressure Recirculation 1n Window 1 P!ffl'1.-9 W/1 Lm TO f£CRC S'llAY OOlD LBl PS1'ft'1ll'D H<S
;::1 H<SILG A-SW"I-XIE-<HJ 0--SWHOE
Failure of Recirculation Spray Window 1 HPR failure loss of HPSH to open containme t CON-VFC-RP--COREM Faih.re to Dklqnose Operator Fc;iihre Loss of RHR Event to Est<bish in POS 6 Recrculation in W1 i)-Snf1-XHE A-SI\f1-XHE-P-13 FAURE OF 01.JTSlrl:: Y RECIRCULATIO F11PSD F2LPSD
Fa,lure of Recirculation Spray ,n Window 1 H-PR failure loss of 1-PSH d e to open contoirrne t CON-VFC-RP-COREM Foiltre to Dioqnose Loss of RHR Event in POS 5 D-SI'lf1-XHE . A-snr 1-XHE-P-18 FALi.RE OF NSICE PRA.Y Ml: CIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray ,n Window 1 HPR failure loss of HPSH d e to open containme t CON-VFC-RP-COREM Faihre to Dia@ose Operator . F ,;iilure Loss of RHR Event to Estobish in POS 6 Recirculotio n in W1 D-Snfi-XHE A-Snfi-XHE-P-4 FALLRE OF INSU: RAY F£CIRCULATIO F1LPSD F2LPSD
Fa,lure of Rec1rculat1on Spray 1n Window 1 HPR failure
- loss of 1-PSH to open oontoinme t CON-VFC-RP-COREM Foilire to DiO<!_nose Loss of RHR Event in POS 6 D-SI'lf1-XHE A-SIW1-XHE-P-9 F1LPSD F2LPSD
Failure of Recirculation Spray in \Ni ndovv 1-cause HPR failure Failtre to Diaqnose Loss of RHR Event in POS 6 D-SI\f1-XHE A-S1W1-XHE-P-13 FALURE OF t-lSICE FALURE OF OUTS[,£ RAY ltCIRCULATIO SPRAY ltCRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray 1n 'Ni ndovv 1-cause HPR failure trl I 00 0 00 Foiltre to Diog_nose Loss of RHR Event *
. in POS 6 D-SIW1-XHE A-SIWi-XHE-P-18 FAILURE OF INSIDE FALURE OF OLJTSIOC RAY RECIRCULATION SPRAY RECIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray ,n \Ni ndovv 1-cause HPR failure trl I 00 0 '° Foiltre to Dioqnose Loss of RHR Event in POS 6 D-SI'lf1-XHE A-snri-XHE-P-4 FAILURE OF INSIDE FAILURE OF OVTSl!:t SPRAY RECIRCULATION SPRAY RECIRCULATJO F2LPSD
Failure of Recirculation Spray* ,n Windovv 1-cause HPR failure tTl I 00 0 Foiltre to Dioqnose Operator FoillJ"e Loss of RHR Event to Est<lb6sh in POS 6 Recrcukrtio n in W1 D-SnH-XHE A-Snfi-XHE-P-9 F1LPSD F2LPSD
UNITY ISIW2 HSIW2 RSIW2 SSIW2
- FSIW2 CSIW2 SEQ # END-S' 1 @
2 @ I 3 OK I I I 4 @ I I I 5 CD I 6 CD m @ 00 l I I I I 7 8 g OK I I I 10 CD I 11 CD Event Tree for Spurious SI - W2/D6
UNITY ISIW2 HSIW2 RSIW2 VW2 SSIW2 FSIW2 GSIW2 CSIW2 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 CD 5 CD m 6 CD 00 N' 7 8 9 CD 10 CD 11 @ 12 @ 13 CD 14 CD 15 CD 16 @ 17 @ 18 CD 19 CD Event Tree for Spurious SI - W2/R6
top event for loss of SI 1n window 2 tTl -I 00 \ >l PRBQ-91 DURATIOtf-R10 REfUEL POS-R10 fRAC-P0510 1 PROB-'W2R1D DURATIOtf-R6 REFUEL POS-R6 PR0B-W2R~ DR-t,,IT [ltJRj_TIOIHl6 PROB-WW~ P05-06
SI SYSTEM RECOVERY IN WINDOW 2 mI 00 ~ CC1J' ITIITJIII IJICDl'BI!' IS 11-411-tmC-1'2
RESTO:RE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 2 RESTO E RHR GIVEN LO S OF
. 4KV MERG BUS IN POS .6 -
DR. MT. trl I . 00
~
VI F !LURE TO DIAGNO E LOSS OF RHR IN LO S OF 4KV BUS H IN POS'S 3-13 P6 OF DR MT W3-S A-SIW2-XHE-R-12 *. D-SIW2-XHE'
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 2 RESTO E RHR GNEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. m I 00 0\ F IL URE TO RESTOR F ILURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-SIW2-XHE-R-3 D-SIW2-XHE
Feed and Bleed the RCS 1n \/Vi ndow 2 Feed and Bleed the RCS in RHR3, Window 1 Food ond Bleed Sofoly Volvo the RCS in RHR3, lfemoved in Window POS 6 of Refueling 1 tI1 I 00 sv-w::: ...J D-BIW2-XBE FNLURE OF FEED FNLURE OF FEED AND SPLL USING AND SPLL USING LPI HPl F9N12L A-B1W2-XBE-FL-l~ A-SIW2-XBE-ra-l~
Feed and Bleed the RCS Window 2 Feed and Blood lh* RCS in RHR3, Window 1 Food and Bleed Safely Volw lho RCS in RHR3. Removed in Wtndow POS 6 of Refueffng 1 t;rJ 00 00 SV-W2 D-S1W2-XHE FM.URE OF FEED FM.URE OF FEED AND SPLl. USING AND SPLl. USING LPI HPI F9N12L F9N12H
.A-S1W2-XHE-FL-5 A-S1W2-XHE-FH-5
Feed and Bleed the RCS with V foiled W, ndo\/'J 2 Feed and Bleed the RCS in RHR3, POS 6 of Refueling Failure to Diagnose Loss of RI-R Event in POS 6 D-SIW2-XHE FAURE OF FEED FAILLRE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW12H FSW12L A-SIW2-XHE-FR-10 A-SIW2-XHE-FL-10
I I Feed and Bleed the RCS with V failed
\Ni ndovv 2 Feed ond Bleed the RCS in RHR3, POS 6 of Refueling Failure to Diagnose Loss of RI-R Event in POS 6 D-SIW2-XRE FAILLRE OF FEED Operator failure FAft..LRE OF FEED AND SPLL l.SING ot use LI-ISi in AND SPLL l.SING HPI Feed and Spill LPI in Window 1 FSW12H FSW12L A-SIW2-XRE-F A-SIW2-XRE-FL-19
Reflux Cooling 1n windovv 2
~~ aCoR';~
in POS 6 of Refueling RCS Loops loolat.ed lo Cauoo Failure of Reflux Cooling IS0-W2 D-SIW2-XHE Operator Failure INSUF A.OW TO lo Feed SG* in 3 SG FRM AT LEAST Window 'I-R3 1 AFW PUMP LSW23 A-SIW2-XBE-S1-17 Operate,- Foiluro F/>JLURE OF F>JL TO U..OSE lo Bleed lho SECOND,t,Rl' SIDE BOTH PORVS SGs 1 given R3 HEAT REMOV/>I.. SSHW23 PQR,f1 SSBW23 A-SIW2-XBE-S2-17 A-SIW2-XBE-S3-17
Reflux Cooling windovv 2 Foiluro lo Diogno,o RCS Loops Isolated Loss of RHR Evenl lo C<Ju"" Foflure in POS 6 of Reflux Cooling 1SO-W2 D-S1W2-XBE INSUF R..OW TO 3 SG FRM AT LEAST 1 AFW PUMP LSW23 A-SI"W2-XBE-S1-8 Operolor Fallure Fl>JLURE OF F/>JL TO 0.06E lo Bleed lhe SECCNCIARY SIDE BOTH PORVS SG, 1 given R3 HE'AT REMOVAL SSBW23 P0Rv1 SSBW23 A-SIW2-XBE-S2-8 A-SIW2-XBE-S3-8
Gravity from RWST Window 2 Gravitv from RWS'f in POS 6 of Refueflng tr1 I 00 ~ Safety Volve Removed in Window 1 GSIWZGZ-15 sv-wz INSUF FLOW Foiltre to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTION FLOW in POS 5 PATH 1 D5.;._CG D-SIWZ-XHE A-SIWZ-XHE-G-15
Gravity from RWST 1n Window 2 Gr<JVitv from RWST in POS 6 of Refuenng S<rfety Valve Removed in Window 1 SV-\fe INSUF FLOW Faih.re to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTION FLOW in POS 6 PATH D-SI\fe-XHE A-SI\fe-XHE-G-6
Failure of High Pressure Recirculation in Window 2 13 FS1V12H A-Sll/2-XHE-C-1J D-StN!->>E H1 H2 D-SPH2-Xt£ 11\S
Failure of Hig.h Pressure Recirculation 1n Window 2 CS O-< FS1V12H W/2. D-Sr/12-XIE A-SPN2->0£-C H1 H2 D-STW'2-XfE A-Sr/12-XHE--o--4 VEN1l12
F oilure of Hig.h Pressure Recirculation In Window 2 cs 0-1B +-18 FSW12H PS!ln.-1!1
-1/12-)(1£ A-SW.2-XHE-X A-SW2-XHE-C-1l D-SW.2->>IE PSN/:2-ta D---S\Y2-XHE
\/Elffi.12
Failure of Hig.h Pressure Recirculation 1n Window 2 CS 0-9 cs PSll/2-9 D--SY/2->0£ A-SW.2-XHE-X fl2 D--SW2-XHE
\IENTl12
Failure (~f Recirculation Spray Window 2 HPR failure Failur" of ReoirculaUon Spray in loss of HPSH to open contoinme t CON-VFC-RP-COREM Foihre to Dioqnose Loss of RHR Event in POS 6 PSIW,rn0-13 o-s1wi-xHE A-SIWi-XHE-P-13 FALURE OF INSIOC FAILURE OF OUTSIOC SPRAY ME:CIRCULATIO PRAY ME:CIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray Window 2 HPR failure loss of 1-f'SH d e to open contoirme t trl I CX) v.) 0 CON-VFC-RP-COREM Foiltre to Diog_nose Loss of RHR Event in POS 6 PSIWl?G0-18 D-SIWl?-XHE .A-SIWl?-XHE-P-18 FAILURE OF NSICE RAY A::CRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray 1n Window 2 HPR failure loss of 1-PSH d e to open cont<iinme t CON-VFC-RP-COREM F<iilLT e to Di<l<:1nose Loss of RHR Event in POS 6 D-SI1f2-XHE A-SI'lfe-XHE-P-4 FAILURE OF INSICE FAILUit OF OUTS1r£ PRAY ~CIRCULATION SPRAY ~CIRCULATIO F1LPSD F2LPSD
Failure Recirculation Spray Window 2 HPR- failure loss of HPSH d e to open oontoinme t CON-VFC-RP-COREM Foilu-e to Diog_nose Loss of RHR Event 1n POS 5 D-snrn-XHE A-snrn-XHE-P-9 FAILURE OF INSIOC FALURE OF OUTS[:£ PRAY A:CIRCULATIO PRAY F£CIRCULATIO F1LPSD F2LPSD
F 01lure of Rec1rculat1on Spray 'Ni ndovv 2-cause HPR f a~lure Failure of Recirculation SJilray In Foihre to Dioqnose Loss of RHR Event in POS 6 D-SI'IY"e-XHE A-snre-XHE-P-13 FAILURE OF INSICE FAILURE OF OUTSICE SPRAY ~CIRCULATION SPRAY ~CIRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray 1n 'Ni ndovv 2-cause HPR failure F<Jihre to Di<Jg_nose Loss of RHR Event in POS 6 D-Snfe-XHE A-SI'W2-XHE-P-18 FAILURE OF INS!a: FALURE OF OlJTSla=: PRAY FI:CIRCULATIO SPRAY FI:CIRCULATIO F1LPS0 F2LPSD
Failure of Recirculation Spray 1n 'Ni ndovv 2-cause HPR failure Failure of Reoiroulation SJi)ray in Foih.re to Diog_nose Loss of RHR Event in POS 6 v-srwe-XHE A-SIWe-XHE-P-4 FAIL.URE OF INSICE FAILURE OF OUTSICE PRAY ftCIRCULATIO SPRAY ftCIRCULATIO F1LPSD F2LPSD
Failure of Recir*culation Spray ,n W1ndovv 2-cause HPR f 01lure Foiltre to Dioqnose Loss of RHR Event in POS 5 D-S1W2-XHE A-S1W2-XHE-P-9 FAlURE OF INSICE: FAn..URE OF OUTSICE: SPRAY RECIRCULATIO SPRAY RECIRCULATIO F1LPSD F2LPSD
- UNITY ISIW3 HSIW3 RSIW3 SSIW3 FSIW3 SEQ #
END-STATE 1 @ 2 - @ I I I 3 OK 4 @ I I I 5 CD 6 @ I I I 7 OK 8 @ I I I g CD-Event Tree for Spurious SI - W3/D6
UNITY 1SIW3 HSIW3 RSIW3 VW3 FSIW3 GSIW3 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 CD 5 CD trJ : 6 @ I 00 w 7 CD 00 8 @ g @ 10 CD 11 CD 12 @ 13 CD Event Tree for Spurious SI - W3/R10
UNITY I ISIW3 I HSIW3 I RSIW3 I VW3 I FSIW3 I GSIW3 I SEQ # END-STATE-NAMES 1 @. 2 @ I I 3 4 CD I I I 5 CD tr1 I 6 @ I 00 7 CD w 8 @ \D I I 9 @ 10 CD I I I 11 CD I 12 @ 13 CD Event Tree for Spurious SI - W3/R6
top-* event for loss of SI 1n window 3 trl I 00 A 0 PIIBQ-S! DUR<ITIOtf-R ID REFUEL P0S-R10 FR<IC-POS10 Pll0B-W3R1C DUR<ITIOtf-RS REFUEL POS-RS OUR'.TIOtf-D6 Pll0B-'W3D~ POS-D6
SI SYSTEM RECOVERY IN WINDOW 3 tI1 I 00 ~ CCW DT!ITBM RllCIJ"l"l!IRr Ill' WL K-81-RBC-W!
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 3 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. tI1 I 00 .I'>, l-..l ILURE TO RESTOR F ILURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4K BUS H IN P6 0 P6 OF DR MT W3-S A-SIW3-XHE-R-3
- D-SIW3-XHE
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 3 RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. tr1 I 00 ~ t.,J
!LURE TO RESTOR F !LURE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-SIW3-XHE-R-9 . D-SIW3-XHE
Safety valves Not Removed 1n Window 3 Safety Valves Not RemOVII in Winoow 3 S 6 of o Droned Manlenaice Outage 1/W G7 POS-D6
. OS 6 of o Refueling POS 10 of o Outage Refueling Outage Wf G1 POS-R6 P0S-R10 Pressurizer Pressu-izer Sofety Va-1es Sofet)' Valves Removed in W3R6 Removeil in W3R6 PZR-SV-RE>.OVEDW3 PZR-SV-REMC7v'EDWJ
Feed ond Bleed the RCS \/Vindow 3 Feed ond Bleed the RCS in RHR3. W"IJ'ldow 1 Feed and Bleed . Safety VdNe tho RCS in RHR3, Removed in W"ndow POS 6 of Refueing 1 trl I 00 SV-W3 ~ D-S1W3-XBE FAILURE OF FEED FAILURE OF FEED ANO SPLL USING AND SPLL USING LPI HPI FSW34L FBW34B A-S1W3-XBE-FL-l0 A-BIW3-XBE-P'II-IO
Feed and Bleed the RCS 1n Window 3 Food and Blood tho RCS i, RHR3, W-indow 1 Food end Blood Safely Valvo - tho RCS ii Rlfi3, Removed in W111dow POS 6 of Rofuoung 1 tI1 I 00 BV-W3 D-8IW3-XBE F.AJLURE OF FEED FAI..URE OF FEED AND SPLl. USING AND SPL1. USING LPI HPI FBW34L FBW34.B A-BIW3-XBE-FL-4 A-BIW3-XBE-m-4
Feed and Bleed the RCS with V failed
\Ni ndov1 3 Feed and Bleed the RCS in RHR3, POS 6 of Refuenng tr:1 Failure to Diagnose I Loss of RI-R Event 00 in POS 6
-.J D-SIW3-XRE FAIL.LRE OF FEED FAILLRE OF FEED AND SPLL LSING AND SPLL LSING LPI HPI FSW34-L FSW34-H A-SIW3-XRE-FH-13 A-SIW3-XHE-FL-13
Feed and Bleed the RCS with V failed 1n
\Ni ndovv 3 Feed and Bleed the RCS in RHR3, POS 6 of Refuenng tI1 I
Failure to Diagnose 00 Loss of RJ-R Event .i::.. in POS 6 00 D-SIW3-XHE FAn..LRE OF FEED FAURE OF FEED AND SPU USING AMJ SPLL LIS ING HPI LPI FSW34-H FSW34-L A-SIW3-XHE-FH-7 A-SIW3-XHE-FL-7
Reflux Cooling 1n windo\A/ 3 tI1 I 00 RCS Loop* lsololed
.is. lo Cou,., Foilure
\0 of Reflux Coc:ling IBO-W3 D-S1W3-XBE INSUF FLOW TO 3 SG FRM AT LfAST 1 AFW PUMP LSW23 A-SIW3-XBE-B1-8 Operolor Foilure FNWRE OF FNL TO QCSE FNLURE OF lo Bleed lhe SECCNDAAY SIDE BOTH PCR\IS SECCNDAAY SIDE SG* 1 given R3 HEAT REMOVN... HEAT REMOVN...
SSBW23 BBBW23 A-BIW3-XBE-S2-8 A-BIW3-XBE-B3-8
Gravity from RWST Window 3 Grovitv from RWST 1n tI1 POS 6 of Refuefing I 00 Ut 0 Scletv Valve Removed" in Window 1 SV-W3 INSUF FLOW Failtre to Diagnose Operator Failur'e THROUGH LOW HEAD Loss of RHR Event to estabfish INJECTION FLOW in POS 6 gravitv feed PATH 1n window 1 D6..::.CG D-SIW3-XHE A-SIW3-XHE-G-11
Gro,vity from RWST Window 3 Gr<JVity from RWST in tr1 I POS 6 of Refuefrng 00
- vi Safety Valve Removed in Window 1
SV-W-3 INSUF FLOW Foih.re to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTK)N FLOW in POS 6 PATH D-SI\f3-XHE A-SI\f3-XHE-G-5
UNITY 1SIW4 HSIW4 RSIW4 SSIW4 FSIW4 SEQ # END-STATE 1 @ 2 @ 3 OK 4 @ tr1 I 5 CD 00 VI 6 @ N 7 OK 8 @ g CD Event Tree for . Spurious SI - W4 /D6
UNITY I ISIW4 I HSIW4 I RSIW4 I VW4 I FSIW4 I GSIW4 I SEQ # END-STATE-NAMES 1 @ 2 @ I I 3 @ 4 OK I I I 5 CD tr1 I I 6 @ 00 7 CD Vt @ I.,) 8 I I g @ 10 OK I I I 11 CD I 12 @ 13 CD Event Tree for Spurious SI - W4 /R 10
UNITY ISIW4 HSIW4 RSIW4 VW4 FSIW4 GSIW4 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 OK 5 CD 6 @ 7 CD 8 @ 9 @ 10 OK 11 CD 12 @ 13 . CD Event Tree for Spurious SI - W4/R6
top event for loss of SI ,n window 4 rI1 I 00
- .r.
- .r.
PRBQ-S! DURATION-RIO REFUEL P05-R10 fRAO-P0510 PROB-'IHR.tll DURATION-RS REFUEL P05-R6 PROB-W~RB DR-MT DUR,l.TION-06 PROB-'IHDB POS--OS
SI SYSTEM RECOVERY IN WINDOW 4 ccw l!Tl!l'l':11111 Rl!l:11nlRT KB 4 tl1 I 00 VI °'
~ !Titllllll R:BCDrl!IRT Ill Wl K-81-R!IC-Wt
RESTORE RHR GIVEN LOSS OF 4KV EMERGENCY BUS H IN window 4* RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 - DR. MT. tTJ I 00 Vl -..l F !LURE TO RESTOR F IL URE TO DIAGNO E LOSS OF RHR IN HR GIVEN LOSS 0 LO S OF 4KV BUS H IN POS'S 3-13 4K BUSH IN P6 0 P6 OF DR MT W3-S A-SIW4-XHE-R-3 D-SIW4-XHE
RESTORE RHR GIVEN LOSS OF 4KV* EMERGENCY BUS H IN window 4
- RESTO E RHR GIVEN LO S OF 4KV MERG BUS IN POS 6 -
DR. MT. tI1 I 00 Vt 00 ILURE TO RESTOR F ILURE TO DIAGNO E HR GIVEN LOSS 0 LOSS OF RHR IN LO S OF 4KV BUS H IN POS'S 3-13 4 BUS H IN P6 0 P6 OF DR MT W3-S A-SIW4-XHE-R-9 D-SIW4-XHE
Feed ond Bleed the RCS 1n VVindow 4 Food and Bleed tho RCS i, RHR3, Window 1 Foed and Bleo d 5<,fely Vrtve lhe RCS in RHR.3, Removed i, Window POS 6 of Refueling . 1 tl1 I 00 Vl sv-w, '° D-9IW4-XHE Fl>JLURE OF FEED FAI..URE OF FEED AND SPLL USING AND SPLL USING LPI HPI FSW34L 1"BW34H A-BIW4-XHE-FL-10 A-BIW4-XHE-FH-10
Feed and Bleed the RCS ,n \Nindow 4 Feed end Bleed lho RCS in RHR3, Wind= 1 Food ond Blood Sofely V~ve lho RCS in RHR3, Removed in W,nd°"' POS 6 of RofuoITng 1 trl I 00 0\ 0 D-SIW<l-XBE FAA.URE OF FEED F.AJLURE OF FEED AND SPLL USING AND SPLL USING LPI HPI FSW3<lB A-SIW<l-XBE-!'L- A-SIW<l-XBE-FB-<l
ond Bleed the RCS with V foiled Wi ndo\A/ 4 F-sed ond Bleed the RCS in RHR3, POS 6 of Refuenng Failure to Diagnose Loss of R~ Event trl I in POS 6 00 O'I FS1W4-VG0-13 D-SIW4--XHE FAILLRE OF FEED FAILlRE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34-H FSW34-L A-SIW4--XHE-FH-13 A-SIW 4--XHE-FL-13
Feed and Bleed the RCS with V failed In
\Ni ndovv 4 Feed and Bleed the RCS in RHR3, POS 6 of Refuefing Failure to Diagnose Loss of Rffi Event tT1I in POS 6 .
00 °'tv D-SIW4--XBE FAILlRE OF FEED FAURE OF FEED AND SPLL USING At-0 SPLL USNG HPI LPI FSW34-H FSW34-L A-SIW4--XBE-FH-7 A-SIW4--XBE-FL-7
Reflux Cooling 1n windovv 4
~~~':," OCR~,
in POS 6 of Rofuoling trJ Foiluro lo Diognoso RCS Loops Isolated I Los* of RHR Event lo eau.. Faob-a 00 in POS 6 of Rofkox Coding 0\ w IS0-W4 D-SIW4-XHE LSW4 A-SI'W4-mE-S1-4 Operolor Foiluro FAA.URE OF FAA. TO QOSE F/>JI...URE OF lo Bleed the SECOND.ARY SIDE BOTH PCfNS SECCNMRY SllE SGs 1 given R3 HEAT REMOVAL HEAT REMOV/>L SSHW4 PORv'1 BSHW4 A-SIW4-XHE-S2-4 A-SI'll'4-XHE-S3-4
Reflux Cooling windovv 4 l'!:i"ac~3 in POS 6 of Refueli,g Failure lo Diagnose RCS Loops loolated Loo, of RHR Event to Cau .. Fail\Jre in POS 6 of Reflux Cooling INSUF A.OW TO 3 SG FRM AT LEAST 1 AFW PUMP LSW4 A-snn-XBE-91-8 Operat.or Failure FM.URE OF FM.TO QOSE to Bleed tho SECCNDl>RY SIDE BOTH PORVS SG, 1 givan R3 HEAT REMOVAL 9SBW4 9BBW4 A-SIW4-XBE-S2-8 A-SIW4-XBE-S3-8
Gravity from RWST 1n Window 4 Grovitv from RWST in . POS 6 of Refuefing tI1 I 00 °' \.ll Safety Valve Removed in Window 1 GSIW4Ge-u SV-W4 INSUF FLOW Faihre to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTYJN FLOW in POS 6 PATH D-SIW4c-XHE A-SIW4-XHE-G-11
Gravity from RWST Window 4 Gr<lVitv *from RWST in POS 6 of Refuefing tI1 I 00 C\ C\ Safety Volve Remove<l in Window 1 INSUF FLOW THROUGH LOW HEAD INJECTON FLOW PATH D-Sl'l\'4-XHE A-SI'l\'4-XHE-G-5
- Appendix E.14 Event Trees arid High Level Fault Trees for Loss of Component Cooling Water(CC)
E-867
UNITY I ICCWl I HCCWl I FCCWlV I CCCWlV I SEQ # END-STA TE-NAMES 1 OK I 2 OK I I 3 OK I 4 CD I 5 CD tr1 I 00 C\ 00 Event Tree for Loss of ccw in D6-Window 1
! UNITY I ICCW1 I HCCW1 I VW1 I SCCW1 I FCCW1 1
*GCCWl 1 CCCWl I SEQ # END-STATE-NAMES I
I I 1 OK I 2 OK I I I 3 4 OK CD tl'1 00 I I I I 5 6 CD CD 0\ \0 I I 7 8 OK OK I 9 CD 10 CD Event Tree for Loss of CCW in R6-Window 1 I
~
top event for loss --of ccw 1n window 1 tr1 I 00 -..j 0 PREQ-OOW DUR.\TION-R10 REfUa POS-R10 fl\.\C-POSIO PROB-WIRIO DUR.\TION-R6 REfua POS-R6 PR08-W1R6 OUfvl.TION-06 PR08-W106 POS-06
- OMIT
CCW SYSTEM RECOVERY IN._ WINDOW 1* CCW ElTil'l'JIII nconnrr llC l tr1 I 00 -...l CCll' IIY!it'BII RBC[7f'Bff Ill 1'l K-CCW-R!IC...:ff1
Feed ond Bleed the RCS Window 1 Feed and Bleed tho RCS in RHR3, Window 1 Food and Bleed Safety Valvo
. the RCS in RHR3, Removed in Window POS 6 of Refuoling 1 SV-Wl tI1 I
00 -.l l--J D-CC'ifl-XBE F/>JLURE OF FEED F/>JLURE OF FEED AND SPLL USING AND SPLL USING LPI HPI F9N12L F9N12H A-CCWl-XHE-FL-o A-CCW l -XHE-FH--6
Feed and Bleed the RCS with V foiled ,n
\Ni ndow 1 F,aed and Bleed the RCS in RHR3, POS 6 of Refueling Failure to Diagnose Loss of RHR Event in POS 6 D-CCW1-XHE FAILLRE OF FEED FAURE OF FEED AND SPLL USING AND SPLL USING HP! LPI FSW12H FSW12L A-CCW1-XHE-FH-10 A-CCW1-XHE-FL-10
Reflux Cooling 1 Reflux Cocling Given a RHR3 in POS 6 of Refueling t'I1 I Faflure to Diagnose RCS Loop* loola\ed 00 L.,.., of RHR Even\ to Cw"" Failuro -.J in POS 6 of Reflux Cocling .j:,. ISO-W1 D-CCWI-XHE INSUF FL.OW TO 3 SG FRM AT LEAST 1 AFW PUMP LSW1 A-CCWI-XHE-Sf-8 Operate<" Failure F/>JLURE OF FM. TO Q.CSE F/>JLURE OF
\o Bleed tho SECCND.ARY SIDE BOTH PCRVS SECCND.ARY SIDE SG, 1 given R3 HEAT REMOVAL HEAT REMOVAL SSHW1 POR\11 SSKIV1 A-CCWI-XHE-Sl-8 A-CCWI-XHE-S2-8
Gravity from RWST Window 1 Gr<lVitv from RWS'r in POS 5 of Refuering Safety Valve Removed in Window 1 SV-W1 INSUF FLOW Failu-e to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTION FLOW in POS 5 PATH
- Ds..;cc D-CCW1-XHE A-CC'lfl-XHE-G-6
Failure of High Pressure Recirculation In Window 1 JifiRf&
~ l~I I
....... z HI
"' =-* ,. ,..,,., WII I
?2
+/-
W.St<.O oa:w,.. n~,111-na: I
- z
Failure of High Pressure Recirculation in Window 1 tp 00 -..l -..l
~ ~
&'of'm W,LVP:S NDl"..,.,,m z.
z CXl VN1 I
.... X ....tul I
YfNl.12
~,~RI
~fa\ra ta~if,
~t->>£-o-G
~,~,=
D-CCli>-M I
~
A,-o:Jl/t-H-o-G
~f~:c D-CCli>-llt£
Failure of Recirculation Spray 1n Window 1 HPR failure loss of HPSH d e to open containme t tl'1 I 00 -....) 00 CON-VFC-RP-COREM Failtre to Diaqnose Loss of RHR Event in POS 6 D-CCW1-XHE A-CCW1-:XHE-P-4 FAILURE OF INS!a:: FALURE OF OLJTSII:E SPRAY ftCIRCULATIO RAY ltCRCULATIO F1LPSD F2LPSD
Failure of Recirculation Spray ,n 'Ni ndovv 1-cause HPR f 01lure tT1 I 00 \0 Failu-e to Diaqnose Loss of RHR Event in POS 6 D-CCW1-XHE A-CCW1-XHE-P-4 FAILURE OF INSIDE FAILURE OF OUTSl[l: SPRAY R:CIRCULATIO SPRAY R:CIRCULATIO F1LPSD F2LPSD
UNITY ICCW2 HCCW2 SCCW2 FCCW2V cccwzv SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK mI 4- OK 00 5 CD 00 0 6 CD Event Tree for Loss of CCW in 06-Window 2
*UNITY I ICCW2 I HCCW2 I VW2 I SCCW2 I FCCW2 I
*GCCW2 I CCCW2 I SEQ #
END-STATE-NAMES 1 OK I 2 OK 3 OK tT1 I I 4 CD I 5 CD I I 00 00 6 CD I ' I 7 OK 8 OK I 9 CD 10 CD Event Tree for Loss of CCW in R6- Window 2
top event for loss of ccw ,n window 2 PRllQ-0::W trl I 00 00 N DUR<ITIDN-R10 REFUEL PDS-RtO FAAC-P0510 PR0B-'W2R1C DUR<1TID~R6 REfUEl. PDS-R6 PR0B-W2R~ DR-MT IJURO.TID~D6 PROB-'W2Dl! POS-D6
CCW SYSTEM RECOVERY IN WINDOW 2 tTl I 00 00 w
Feed ond Bleed the RCS 1n VVindow 2 Food and Bleed the RCS in RHR.3, W-tndow 1 Feed and Bleed Safely Valve the RCS in RHR.3, Removed in Window POS 6 of Refueling 1 tl1 I SV-lf2 00 00 .j::,. D-CCW2-XHE Fl>JLURE OF FEED F/IJLURE OF FEED AND SPLL USING AND SPLL USING LPI HPI F91112L F91/12H A-CClf2-XHE-FL-5 A-CClf2-XHE-FH-5
Feed and Bleed the RCS with V foiled 1n
\Ni ndo\/'1 2 Faed o nd Ble'ed the. RCS in RHR3, POS 5 of Refueling Failure to Diagnose tr1 I Loss of RI-R Event 00 in POS 5 00 V1 FCCW2VGO D-CCW2-XRE FAILLRE OF FEED Operator Failure FAILLRE OF FEED AND SPLL USING to* use HHSI in AND SPLL USING HPI feed and spill LPI in Window 1 FSW12H FSW12L A-CCW2-XRE-FR-10 A-CCW2-XRE-FL-10
Reflux Cooling windo\A/ 2
§t; oCo:k1 in POS 6 of Refueling tr1 I
00 Failure to Diagnose RCS Loops loololed 00 Loso of RHR Event lo eou.. Failure C\ in POS 5 of Reflux Coding IS0-W2 D-CCW2-XBE LSW23 A-CCW2-XBE-SF-8 Operala- Failure F/IJLURE OF F/IJL TO QOSE lo Bleed tho SECQ-IOARY SIDE BOTH PCRVS SGo 1 given R3 HEAT REMOV.AJ... 88BW23 8BHW'23 A-CCW'2-XBE-S1-8 A-CCW2-DIE-B2-8
Gravity from RWST ,n Window 2 Grovitv from RWS'f in POS 6 of Refuering mI CY.) CY.) -..J Sofety Volve Removed in Window 1 sv-we INSUF FLOW Foillre to Diognose THROUGH LOW HEAD Loss of RHR Event INJECTON FLOW in POS 6 PATH bs-CG o-ccwe-xHE .A-ccwe-xHE-G-6
F oilure of Hig.h Pressure Recirculation
,n Window 2--
tI1 I 00 00 00 FSW12H f'Ct\'12 D--CCYl2-XI£ A-OCW2-Xl£-X A-OCW2-XHE-<:4 0~2-XHE PCCYl2 HI H2 D-0CW2-XHE A-CCW2->>IE-C-4 VENTLl2 A--CCY/2-)11£-C-4
Failure of High Pressure Recirculation in Window 2 tI1 I 00 00 \0 D-CCW2-xt-E A~-XHE-X PCCY/2 VW2 D-CCW2->01E INSlF FlO'>N FRM FallU'l!I to Dlcg_r.oe.l!I alUro at Reclrci.Jcl 3 CI-RG PMPS IN Tt£ RECR MOOE Looo~r~i Evmt 6 Spra,o i1 Wirdow Hl PCC'l/2 H1 D-CC\Y2-XHE A-CCW2-l0£-C-9 Vent Exilt* PCCW2N D-CC1Y2->>JE
Failure Recirculation Spray In Window 2 HPR failure loss of HPSH d e to open contoirme t tI1 I 00 \0 0 CON-VFC-RP-COREM Foiltre to Dioqnose Loss of RHR Event in POS 5 D-CCW2-XHE A-CCW2-XHE-P-4 FAILURE OF INSH:l:: FALURE OF OUTS!E SPRAY F£CIRCUlATIO PRAY F£CRCUlATIO F1LPSD F2LPSD
Failure of Recirculation. Spray in 'Ni ndovv 2-cause HPR failure tT1 I 00 '° Foilu-e to Diog_nose Loss of RHR Event in POS 6 D-CCWZ-XHE A-CCWZ-XHE-P-4 FAILURE OF INSICE FAILURE OF OLJTSa:::£ SPRAY RECIRCULATIO SPRAY RECIRCULATION F1LPSD F2LPSD
UNITY ICCW3 HCCW3 SCCW3 FCCW3V SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK tT1 I 4 OK 00 5 CD \0 1-...l Event Tree for Loss of CCW in D6-Window 3
UNITY I ICCW3 I HCCW3 I VW3 I FCCW3 I GCCW3 I
*SEQ # END-STATE-NAMES 1 OK I 2 OK I I 3 OK 4 CD I I 5 CD I 6 OK 7 CD Event Tree for Loss of CCW in R10-Windcw 3
UNITY ICCW3 HCCW3 VW3 FCCW3 GCCW3 SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 CD lT1 5 CD 00 I 6 OK 7 CD \0 Event Tree for Loss of CCW in R6-Window 3
top event for loss of ccw 1n window 3 tT1 Plll!Q-CllW I 00 \Q VI DIJRATIO!Hl10 *REfU£1. PDS-R10 f'RAC'-POSII *PROB-'11'3Rlll DURATION-R6 REfU£1. POS-R6 PROB-'W:!R~ OR-NT IXJR,O.TiltHJS PROB-1'3IHI POS--06
CCW SYSTEM RECOVERY IN WINDOW 3 tr1 I 00 °° ctlr l!liYDT!llf Al!CIJIJJIIRT 11.'1' Wl
Feed and Bleed the RCS 1n Window 3 Feed and Bleed
\he RCS in RHR3, Window 1 Feed and Bleed Safely Valw
\ho RCS in RHR3, Removed in Window POS 6 of Refueung 1 SV-W3 trJ I
00 \0 -.l D-CCW3-XHE FM.URE OF FEED FM.URE OF FEED AND SPLl. USING AND SPLl. USING LP! HP! FSW34L .FSW34H A-CCW3-XHE-FL-6 A-CCW3-XHE-FH-5
Feed and Bleed the RCS with V foiled 1n
\Ni ndovv 3 Faed and Bleed the RCS in RHR3, POS 6 of Refuefing Failure to Diagnose trJ Loss of Rt-R Event I in POS 6 00 ID 00 D-'<:CW3-XHE FAILLRE OF FEED FAILLRE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW34H FSW34L
.A-'<:CW3-XHE-FH-10 .A-'<:CW3-XHE-FL-10
Reflux Cooling 1n windovv 3 tT1 RCS Loop* l,claled I lo eau .. Failure 00 of Refknc Cocling \D \D IB0-W3 D-CCW3-XHE Operala- Failure INSUF Fl.OW TO lo Feed SGo in 3 SG FRM AT LEAST Wind""' 1-R3 1 AFW PUMP LBW23 A-CCW3-XHE-BF-7 Operate.- Failure FM..URE OF FALTO QOSE FM.URE OF lo Bleed the SECCNDAAY SOE BOTH P<RVS SECCND/rRY SOE SGo 1 given R3 !-£AT REMOWL HEAT REMOV/>L BSHW23 PORV1 S8HW23 A-CCW3-XHE-S1-7 A-CC11'3-XH!:-B2-7
Gravity from RWST Window 3 Gr<lVitv from RWST in POS 5 of Refuefing Sofety Volve Removed in Window 1 SV-W3 INSUF FLOW FoilLre to Diognose THROUGH LOW HEAD Loss of RHR Event INJECTION FLOW in POS 5 PATH D-CCW3-XHE A-CCW3-XHE-G-6
- UNITY I ICCW4-I HCCW4-*
I SCCW4-I FCCW4-V I SEQ #
- END-STATE-NAMES I
1 OK I I 2 OK I 3 OK 4- OK 5 CD Event Tree for Loss of CCW in D6-Window 4
UNITY I ICCW4
\
HCCW4 I VW4 I FCCW4 I GCCW4 I SEQ # END-STATE-NAMES 1 OK I 2 OK I I 3 OK I I I 4 OK 5 CD I 6 OK 7 CD Event Tree for Loss of CCW in RlO-Window 4
I UNITY I ICCW4 I HCCW4 I VW4 I FCCW4 I GCCW4 I *SEQ # END-STATE-NAMES 1 OK I 2 OK I I 3 OK i I I 4 5 OK CD I 6 OK 7 CD I Event Tree for Loss of CCW in R6-Window 4
top event for loss of ccw ,n window 4 PHl!Q-CX:W DURATION-RIO _REfUa PDS-RIO fRAO-P0510 PR0B-W4R1D DURATION-RS REFUa PD5-R6 PROB-W4-R!! DR-MT DUR'.TION--D6 PR0B-'W4-D!! POS-D6
CCW SYSTEM RECOVERY IN WINDOW 4 CCW BY!t'llll JtJICCff'lUt!' Ill'
.,.1 K-CCW-R'.llC~t
Feed ond Bleed the RCS ,n \/Vi ndow 4 Food and Bleed lhe RCS in RHR3, Wind<>N 1 Feed and Bleed Safely Valve lho RCS in RHR3, Removed ii, WITTdcw POS 6 of Rofuering 1 mI '° 0 0\ SV-W4 D-ccw~-XHE F/>JLURE OF FEED F/>JLURE OF FEED AND SPLL USING AND SPLL USING LPI HPI FBW34L FBW34H A-CCYf4-XHE-FL-5 A-CCW4-XHE-FH-6
Feed and Bleed the RCS with V foiled Wi ndovv 4 Feed and Bleed the RCS in RHR3, POS 6 of Refueling Failure to Diagnose Loss* of RHR Event
. in POS 6 D--CCW4--XHE FAILLRE OF FEED FAILLRE OF FEED AND SPLL I.SING AND SPLL I.SING HPI LPI FSW34-H FSW34-L A--CCW 4--XHE-FH-JO A--CCW4--XHE-FL-JO
Reflux Cooling windovv 4
§i;:,x aC;(~~
in POS 6 of Refueling Failure lo Diagno,e RCS Loop* Ioolaled Loo, of RHR Evonl lo Cauoe Failure in POS 6 of Reflux Cociing IS0-W4. D-CCW4.-XHE INSUF FLOW TO 3 SG FRM AT LEAST 1 AFW PUMP LSW4. A-CClf4-XHE-SF-7 Operala- Failure F/IJLURE OF F.AJL TO QOSE lo Blood lhe SECOND.ARY SIDE BOTH PORVS SGo 1 given R3 HEAT REMOVAL SSHW~ POR\11 SBHW4. A-CCW4.-XHE-S1-7 A-CCW4.-XHE-S2-7
e *
- Gravity from RWST Window 4 Gr<lVitv from RWST in POS 6 of Refuefing trl I
\0 0 \0 Safety Valve Removed in Window
.1 INSUF FLOW Foiltre to Diagnose THROUGH LOW HEAD Loss of RHR Event INJECTK)N FLOW in POS 6 PATH
'D6-CG D-CC'lf4-XHE A-CC'lf4-XHE-G-6
Appendix E.15 Event Trees and High Level Fault Trees for Loss of Instrument Air (AR) E-910
*UNITY I IARWl I HARWl I RARWl I VWl I SARWl I
- FARWl I GARW1 . I CARWl I SEQ H
- END-STJ! TE-~
1 OK I 2 OK I I 3 4 OK OK tT'l I I 5 CD 6 CD I l,C) I I 7 CD OK I I B 9 OK I 10 CD I 11 CD ARW1R6 Event Tree w
UNITY IARWI HARW! RARW1 FARW!V CARW1V SEQ II END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK tTl 5 CD I 6 CD '° N ARW 106 [vent Tree
Top Event for Loss of Instrument Air ,n Window 1 FREQ-AIR tI1 -'° w I OURATION-RlO REFUEL POS-RlO FRAC--f'OS10 PROB-WlllO POS-R6 PROB-Wll6 DUlATION-R6 DR-MT Dl.llATION-06 PR08-W1l6 POS-o6
Non-Recovery of lnStrument Air
- in Window 1 Non-Recovery of Instrument Air Failure to Restore
- Instrument Air in Window 1 PRNR-ARW1
Restore RHR given Loss of Instrument Air in Window 1 Restore RHR Given Loss of Instrument Air in Window 1 Failure to Restore Failure to Diagnose Loss of Air RHR, given Loss of Loss of instrument P0Ss 3-13 Instrument Air in Air in Window 1 Window 1 W3-S A-ARWl-XHE-R-5 D-ARWl-XHE
Sof ety Valves : ' Not Removed ,n Window 1 Safety Valves Not Removed in Window 1 POS 10 of a POS 6 of a Drained Refueling Outage MainteAance Outage POS-RlO POS-D6 POS 6 of a Refuelin Outage POS-R6 Pressurizer Safety Valves Removed in W1R6 PZR-SV-REMOVEDWl
Reflux Cooling Window 1 m I \0 ...... ISO-Wl -..J D-ARlH-XHE LSW1 A-ARll'l-XHB-SP-10 SStH/1 PORVI SSH\111 A-ARll'l-XHB-91-10 A-AR'IH-XHB-92-10
RCS Loops Isolated to Couse F oilure of Reflux ,n Window 1 tr:l I \0 00 NO a.cs SIGNA.l POS 10 of a S 6 of a Refueling OPER OR AUTO Refuefing Outage Outage TRAIN A POS-06 POS-R10 PO,S-R6 Loops Isolated. Loops Isolated in of window in window 1 of 1 of R'Kl R6 LOOPISQATED06 SGS-DRAINE~SO SG5-DRAt£D-R LOOPISOU.TED 1R 'Kl LOOPlsa.ATEO 1R6
- Feed and Bleed the RCS Given Loss of Air 1n Window 1 Feed and Bleed Safety Valve the RCS Given Removed in Window Loss of Instrument 1 Air in Window 1 FAR 1Gl SV-W1 Failure to Diagnose Loss of Instrument Air in window 1 D-ARlfl-XHE PAR 1G3 FALURE OF i FEE:D ' FALURE OF FEED AND SPLL USING . AND SPLL USING LPI HPI FSW12L FSW12H A-ARlrI-XHB-PL-6 A-ARll'l-XHB-FH-6
Sof ety Valves Removed Window 1 Safety Valve Removed in Window 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 Volves Removed in W1R6 P0S-R6 PZR-SV-REMOVEDW 1
- Feed and Bleed the RCS with V foiled Window 1 Given Loss of Air Failure to Diagnose Loss of Instrument Air in window 1 D-ARWl-XHE FALURE OF FEED FAILURE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW12H FSW12L A-ARWl-XHE-FH-11° A-ARWl-XHE-FL-11
Gravity from RWST Given. Loss of Instrument
**Air ,n Window 1 Safety Valve trl I
Removed in Window 1 '° N N Foilure to Diagnose Loss of Instrument INSUF FLOW. Air in Window 1 HROUGH LOW HEAD INJECTION FLOW PATH 06-CG D-ARWl-XHE A-ARWl-XHE-G:-7
Failure of Hig~ Pressure Recirculation 1n Window 1 HPR ff-'l'l Fe 9 P.&BYO WJlll.12
F oilure of Recirculation Spray ,n Window 1-cause HPR failure F ilure of Recirculation Sproy in Window 1 loss of HPSH du to open containmen CON-VFC-RP-COREM Failure to Diagnose Loss of Instrument Air in Window 1 A-ARW1-XHE-P-5 D-ARW 1-XHE' ALURE OF OUTSIDE FALURE OF INSIDE PRAY RECIRCULATION PRAY RECIRCULATION F2LPSD Ft..PSD
Failure of Hig~ Pressure Recirculation 1n Window 1 HPR
- PAllYII'
UNITY IARW2 HARW2 RARW2 VW2 SARW2 FARW2 GARW2 CARW2 SEQ # END-ST TE-t 1 OK 2 OK 3 OK 4 OK 5 CD 6 CD 7 CD B OK 9 OK 10 CD 11 CD ARW2R6 Event Tree
UNITY IARW2 HARW2 RARW2 SARW2 FARW2V *- CARW2V SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 OK 6 CD 7 CD ARW2D6 Event Tree
Top Event for Loss of Instrument Air 1n Window 2 PAIQ-AIR llll<ATDN-R1l POS-R1l f'RAC-POS1l Pft08-W2R1l . POS-!16 OR-MT Oll<ATION-D6 POS--06
Non-Recovery of Instrument Air in Window 2 Non-Recovery of Instrument Air Failure to Restore Instrument Air in Window 2 PRNR-ARW2
Restore RHR given Loss of Instrument Air in Window 2 Restore RHR Given Loss of Instrument Air in Window 2 Failure to Diagnose Loss of Air Loss of instrument POSs 3-13 Air in Window 2 W3-S A-ARW2-XHE-R-5 D-ARW2-XHE
Safety :Valves Not Removed W-indow 2 Safely Valves Not Removed in Window 2 POS 10 of a OS 6 of a Drained Refueling Outage Maintenance Outage P0S-R10 POS-D6 OS 6 of a Refueling Outage P0S-R6 Pressurizer Safety Valves Removed in W2R6 PZR-SV-REMOVEDW2
Reflux Cooling Window 2 Failure to Diagnose RCS Loops Isolated Loss of Instrument lo Couse Failure Air in Window 2 of Reflux Cooling ISO-W2 D-ARW2-XHE Operator F oilure to Feed SGs in Window 2-AIR LSW23 SAR 204 A-ARW2-XHE-SF-10 FALTO QOSE BOTH PORVS SSHW23 PORV1 SSHW23 A-ARW2-XHl!-S1-10 A-AR1'2-XHE-S2-10
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 2 RCS Loops Isolated to Couse f oilure of Reflux Cooling NO CLCS SIGl'W. of a Refueling OPER OR AUTO Outage TRAIN A
!SOW -G!O POS-06 P0S-R10 P0S-R6 Loops Isolated in or Window 2 of R10 LOOP ISOLA TED2D8 SGS-DRAINED-CSD SGS-ORAINED-R LOOP!SOLA TED2R10 LOOP1SOLA TED2RO SGS-ORAINED-R
Feed and Bleed the RCS Given Loss of Air 1n Window 2 Safety Valve Removed in Window 2 F oilure to Diagnose Loss of Instrument Air in Window 2 D-ARW2-XHE FALURE OF FEED FAILURE OF FEED AND SPLL USING AND SPLL USING HPI LPI FSW12H A-ARW2-XHE-PH-6 FSW12L A-ARW2-XHB-FL-6
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 P0S-R10 POS-D6 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W2R6 P0S-R6 PZR-SV-REMOVEOW2 _J
Feed ond Bleed the RCS with V foiled ,n Window 2 Given Loss of Air Feed and Bleed the RCS Given Loss of Instrument Air in Window 2 Foilure to Diagnose Loss of Instrument Air in Window 2 D-ARW2-XHE FALURE OF FEED FALURE OF FEED AND SPILL USING AND SPILL USING HPI LPI
. I FSW12H FSW12L A-ARW2-XHE-FH-11 A-ARW2-XHE-FL-11
Gravity from RWST given Loss of Instrument Air 1n Window 2 Safety Valve Removed in Window 2 Failure to Diagnose Operator Failure INSUF FLOW Loss of Instrument to Establish HROUGH LOW HEAD Air in Window 2 Gravity Feed INJECTION FLOW
-in Window 2 PATH D6-CG D-ARW2-XHE A-ARW2-XHE-G-7
Failure of Hi9.h Pressure Recirculation In Window 2 HPR 811'rtT Valnv T
- iemDT6d.
fiN--w.2
*a1ll'G of R9cirwlotlo
~rq,, r'k \litndow ~,1',~~
trl ff'1 ~ 00 PARW& FSWIOH J.-AAW'.!-l:lm-C-6 n-.u.wa-:um
""5 K',9t.O ""5H..G "'5
- Failure of Recirculation. Spray 2-cause HPR failure
- Window ailure of Recirculotio Spray in Window 2
loss of HPSH d to open containme t CON-VFC-RP-COREM Failure ta Diagnose Failure to Diagnose Loss of Instrument FALURE OF FEED Loss of Instrument AND SPU USM Air in Window 2 Air in Window 2 HP! FSW12H A-ARW2-XHE-P-5 D-ARW2-XHE D-ARW2-XHE A-ARW2-XHE-X F2LPSD Fl.PSD
Failure of Hig.h Pressure Recirculation In Window 2
.t.-ilwa-nm-c-10 n-..u.wa-:um
- UNITY I IARW3 I HARW3 I RARW3 I VW3 I FARW3 I
- GARW3 I SEQ # -- END-STATE-NAMES
- i I
I iI I OK I 2 OK I I 3 OK I I I I I I 4 5 OK CD 6 CD I 7 OK 8 CD ARW3R6 Event Tree
UNITY IARW3 HARW3 RARW3 VW3 (:ARW3 GARW3 SEQ # END-STATE-NAMES l OK 2 OK 3 OK 4 OK 5 CD 6 CD 7 OK 8 CD ARW.3R10 Event Tree
ITY IARW3 HARW3 RARW3 SARW3 FARW3V # END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 OK 6 CD ARW3D6 Event Tree
T-op Event for Loss of Instrument Air 1n Window 3 PRBQ-AIR POS-RIJ PR08-WJRIJ POS-R6 Ol.RATION-R6 llfHll PRm-W306 POS---Oli
Non-Recovery- of Instrument Air in Window 3 Non-Recovery of Instrument Air Foilure to Restore Instrument Air in Window 3 PRNR-ARW3
Restore RHR given Los*s of Instrument Air in Window 3 Restore RHR Given Loss of Instrument Air in Window 3 Foilure to Restore FoillJ'e to Diagnose Loss of Air RHR, given Loss of Loss of instrument POSs 3-13 Instrument Air in Air in Window 3 Window 3 A-ARWJ-XHE-R-:1 D-ARW3-XHE
Sof ety Not Removed Window 3 Safety Valves Not Removed in Window 3 OS 6 of a Drained Maintenance Outage POS-06 OS 6 of a Refueling POS 10 of a Outage Refueling Outage VW G4 P0S-R6 P0S-R10 Pressixizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6 PZR-SV-REMOVEOW3 PZR-SV-REMOVEOW3
Reflux Cooling 1n Window 3 ISO-W3 D-ARW3-XHB LSW23 SAR 3G4 A-ARW3-XHE-SP-8 SSlffi23 PORVI SStN/23 A-ARW3-XHE-S1-8 A-ARW3-XHB-Sll-9
RCS Loops Isolated to Couse Foilure of Reflux 1n Window 3 POS-06 PDS-RIO P0S-R6 SGS-DRA11£D--<:SO LOOPJSQATED306 SGS-DRAN(D-R LDa'1SCI.ATED3R6 SGS-rnAND-R
and Bleed the RCS Given Loss of Air 1n Window 3 Safety Valve Removed in Window 3 SV-W3 Failure to Diagnose Loss of Instrument Air in Window 3 D-ARW3-XHE FAILLRE OF FEED FALURE OF FEED AND SPILL USING AflO SPU USII\G I-Pl LPI FSW34H FSW34L A-ARW3-XHE-FH-5 A-ARW3-XHE-FL-5
Sof ety Valves Removed 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 POS-R6 PZR-SV-REMOVEDW3
- POS-RlO PZR-SV-REMOVEDW3
Feed and Bleed the RCS with V foiled Window 3 Given Loss of Air Foilure to Diagnose oss of Instrument Ai in Window 3 D-ARW3-XHE FAR 3VG3 FAR 3VG4 Operator Foilure FALURE OF FEED FAILURE OF FEED ta use HHSI in AND SPLL USING AND SPILL USING feed and spill HPI LPI in Window 3 FSW34H FSW34L A-ARW3-XHE-FH-9 A-ARW3-XHE-FL-9
Gravity from RWST given Loss of Instrument Air 1n Window 3 Gravity from RWST given Loss of Instrument Air in Window 3 Safety Valve Removed in Window 3 INSUF FLOW Failure to Diagnose HROUGH LOW HEAD L ss of Instrument Air INJECTION FLOW in Window 3 PATH D6-CG D-ARW3-XHE A-ARW3-XHE-G-6
UNITY IARW4 HARW4 RARW4 VW4 FARW4 GARW4 SEQ # END-STATE-NAMES 1 OK 2 OK 3 OK 4 OK 5 OK 6 CD 7 OK a CD ARW4R6 Event Tree
UNITY I IARW4 I HARW4 I RARW4 I VW4 I FARW4 I GARW4 I SEQ # END-STATE-NAMES 1 OK I 2 OK I I 3 OK I I 4- OK 5 OK I I 6 CD I 7 OK 8 CD ARW4R10 Event Tree
UNITY IARW4 HARW4 RARW4 SARW4 FARW4V SEQ H END-STA TE-NAMES 1 OK 2 OK 3 OK 4 OK 5 OK 6 CD ARW4D6 Event Tree
Top Event for Loss of Instrument- Air Window 4 IAR 4-Gl FREQ-AIR Ol.RATION-fl1l REFlE. POS-R1l FRAC-POS10 PR08-W4R1l Ol.RATION-R6 POS-R6 OR-MT PROB-W406 POS-D6
Non-Recovery of Instrument Air in Window 4 Non-Recovery of Instrument Air Foilure to Restore Instrument Air in Window 4 PRNR-ARW4
Restore RHR grven Loss of Instrument Air in Window 4 Restore RHR Given Loss of Instrument Air in Window 4 Faillre to Diagnose Loss of Air Loss of instrument POSs 3-13 Air in Window 4 W3-S A-ARW4-XHE-R-6 D-ARW4-XHE
/
- l Sof ety Valves Not Removed Window 4 Safety Valves Nat 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 Outage POS-R6 POS-R10 Pressurizer Pressurizer Safety Valves Safety Valves Removed in W4R6 Removed in W4R6 PZR-SV-REMOVEDW4 PZR-SV-REMOVEDW4
Reflux Cooling Window 4
~~~~xL~:li~
Instrument Air
'n Wind Failure to Diagnose RCS Loops Isolated L ss of lnstnrnent Air to Couse Foik..-e in Window 4 of Reflux Cooling D-ARW4-XHB NSLf' FLOW TO SG FRM AT LEAST 1 AFW PUMP LSW4 SAR 4G3 SAR 4G4 A-ARW4-XHB-SF-9 Operator Failure FALURE OF FAL TO CLOSE FALi.ff: OF to Bleed the SECOl'OARY SIDE BOTH PORVS SECor-OARY SOE SGs .in Window HEAT REMOVAL HEAT REMOVAL 4
SSHW4 PORV1 SSHW4 A-AR1H-XHB-S1-9 A-AR1'4-XHE-S2-9
RCS Loops Isolated to Couse Failure of Reflux 1n Window 4 RCS Loops lsoloted to Couse f oilure of Reflux Coo,ng NO CLCS SIGN'IL of a Refue6ng OPER OR AUTO Outage TRAIN A ISOW G'K) POS-D6 P0S--R10 P0S--R6 Loops Isolated in al window 4 of R10 LOOPISOLATE04D6 SGS-DRAINED-CSD SGS-ORAl'IED-R LOOPISQATED4R 10 LOOPISOLATED4R6 SGS-ORAINED-R
Feed and Bleed the RCS Given Loss of Air 1n Window 4 Sofety Valve Removed in Window 4 S>/-W4 Fcilure to Diagnose oss of Instrument Ai in Window 4 D-ARW4-XHB FALLRE OF FEED FAft..URE OF FEED ANO SPU USING ANO SPU USING f-f'I LPI FSW34H A-All'lf4-XHE-FH-6 A-ARW4-XHE-FL-6
Sof ety Valves Removed ,n 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 POS-R6 PZR-SV-REMOVEDW4 POS-R10 PZR-SV-REMOVEDW4
- Feed and Bleed the RCS with V foiled Window 4 Given Loss of Air Failure to Diagnose L ss of Instrument Air in Window 4 trl I
\0 0\ Vt D-ARW4-XHE FARW VGZ FARW VG3 FALURE OF FEED Operator Failure Operator failure FALURE OF FEED AND SPLL USING to use *HHSI in at use LHSI in AND SPLL USING HPI feed and spill Feed and Spill LPI in Window 4 in Window 4 FSW34H FSW34L A-ARW4-XHE-FH-9 A-ARW4-XHE-FL-9
Gravity from RWST grven Loss Instrument Air 1n Window 4 Safety Valve Removed in Window 4 SI/-W4 INSUF FLOW Failtre to Diagnose HROUGH LOW HEAD L ss of Instrument Air INJECTION FLOW in Window 4 PATH D6-CG D-ARW4-XHE A-ARW4-XHE-G-6
- Appendix E.16 Event Trees and High Level Fault Trees for Loss of Switgear Room Cooling(SR)
- E-967
UNITY ISRW! ARCW1 VW! SSRW1 2CHSW1 GSRW1 --SEQ # END-STATE-N ME 1 @ z @ 3 CD 4 CD 5 CD 6 @ 7 CD 8 CD SRW 1R6 EVENT TREE - LOSS OF ESGR COOLING
- I UNITY I ISRW1 I ARcw1 j 2cHsw1 I
- SEQ # END-STATE-NAMES -
- 1 @
I @> I I 2 I 3 CD 4 CD SRW106 EVENT TREE - LOSS OF ESGR COOLING
TOP EVENT FOR ESGR COOLING LOSS SR tI1 I PRHQ-SR 'CJ -..J 0 ILLY OH p DUAATIOK-R 10 P0S-fl10 PRCl3-WR10 DR-Mr PROB-WU
Failure to Diagnose 012erator Fails ESGR Event SR to Restore Room in POS 6 of Refuel Cooling after SR in POS 6 of D-SRW1-XHE R-SRW1-XHE-RC-3
Sof ety valves Not Removed ,n Window 1 Safety Valves Not Remove in Window 1 POS 6 of a Draine Maintenance Outage POS-RlO POS-06 POS 6 of a Refueli Outage P0S-R6 Pressurizer Safety Valves Removed in W1R6 PZR-SV-REMOVEDW1
Reflux Cooling 1n window 1 Fa1re to llioqnose RCS Loops Isolated Lo,s of RHR Event to Coll9e Fcihn n POS 6 of RcfMc Cooing ISO-W1 D-SR\71-XllE INSI.J' FLOW TO SG FRM AT LEAST 1 MW PUMP A.-SRWJ-IHB-Sl'-7 FAI. TO CI.OSE FAI.URE Cf" BOTH POR\IS 5ECOIOAR'f SIDE I-EAT REMa/.11.. SSHW1 A-SRW1-Il1B-Sl-7 A-SR'lf 1-l[Bl!!-Be-7 _J
SV-W1 ailure to Di agnos Operator Failure o X-Tie CHG Flo ESGR Event SR i from U2 to U1 POS 6 of Refuel D3U2 A:-SRW1-XHE-CW D-SRW1-XHE A-SRW1-XHE-2CH
- Cross-Tie of U2 CHG Flow 1n SR, POS 6 Refueling Opera.tor Failure ailure to Diai;nos o X-Tle CHG Flo ESGR Event SR 1 from 02 to Ul POS e of Refuel D3U2 A-SRWl-XHE-CW-7 D-SRW1-XHE A~SRW1-XHE-2CH-7
Gravity from RWST SR Gravity from RWST in SR, POS 6 of Refuering Safety Volve Removed SV-W1 INSl.f" FLOW Fcilur1;1 to Diog_nose Operator Foihn
~OUGH LOW HEAD Loss of RHR Event to estoolish NJECTION FLOW in POS 6 gravity_ feed PATH 06-CG D-SRlfl-XHE .A-SRW' 1-XHE-G-!l
Safety Valves Removed Window 1 Safety Valve Removed ln Window 1 Sv W1 POS 10 of a POS 6 cf a Drained Refueling Outage Maintenonce Outoge P0S-R10 POS-06 POS 6 of a Refuelin Pressurizer Outage Safety Valves Removed in W1R6 P0S-R6 PZR-SV-REMOVEDW1
UNITY ISRW2 ARCWZ VW2 SSRW2 ZCHSW2 GSRW2 SEQ # END-STATE-N ME 1 2 @ 3 CD 4 CD 5 CD 6 @ 7 CD 8 CD SRW2R6 EVENT TREE - LOSS OF ESGR COOLING
- I UNITY I ISRW2 I ARCW2 I SSRWZ I 2CHSW2 I SEQ # END-STATE-NAMES 1 @
I 2 @ I I 3 @ I I I 4 CD I 5 CD SRW206 EVENT TREE
- LOSS OF ESGR COOLING
TOP EVENT FOR ESGR COOLING LOSS SR PRBQ-SR ILLY DU FRAC-POSIO PROB-IURlO POS-R6 PR0B-YZll8 OR-MT P1IOB-W2D8
Failure to Diagnose O~erator Fails ESGR Event SR to Restore Room in POS 6 of Refuel Cooling ofter SR in POS 6 of D-SRW2-XHE R-SRW2-XHE-RC-3
Sof ety valves Not Removed Window 2 Safety Valves Not Remove in Window 2 POS 10 of a S 6 of o [xained Refuafing Out09e Mointeoonc:e Outage P0S-R10 POS-06 OS 6 of o Refueling Outage P0S-R6 Pressurizer Sofety Volves Removed in W2R6 PZR-SV-REMOVEOW2
Reflux Cooling 1n window 2 RCS Locps Isolated 10 <:aU9e Faitre of Rof~x Cooing IS0-W2 D-9R1T2-XB1! INSLF Fl.OW TO SG FRM AT LEASr 1 >FW PUA!' A-SR.W2-XHl!:-Sf'-7 Operator FOl'kre FALTO a.OSE FALUlE rF to Bleed the BOTH PORI/S SECO~ SIDE SGs 1 ,j,on L1 I-EAT REMCW.11.. SSHlfZ3 f'CR\11
.A-SRW2-XIIE-91-7 A-SRW2-XHl!!-92-7
SV-W2 ail ure to Di agno ~ Operator Failure o X-Tle CHG Flo ESGR Event SR i from UZ to Ul POS 6 of Refuel D3UZ A-SRWZ-XHE-CW n-smrz-XHE A-SRWZ-XHE-ZCH-4
Cross-Tie of U2 CHG Flow 1n SR, POS 6 Refueling ailure to Di agno,s Operator Failure o X-Tle CHG Flo ESGR Event SR 1 from UZ to Ul POS 6 of Refuel D3UZ A-SRWZ-XHE-CW-7 D-SRWZ-XHE A -SRWZ-XHE-ZCH-7
Gravity from RWST SR Gravity from RWsr in SR, POS 6 of Refuering Safety Volve RemO',!ed SV-W2 Fol.ire to Diagnose Operator Foih..-e Loss of RHR Event to establish in POS 6 gravity feed D6-CG D-SRW2-XHE A-SRW2-XHE-G-~
Safety Valves Removed Window 2 Safety Valve Removed in Window 2 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
UNITY ISRW3 ARCW3 VW3 2CHSW3 GSRW3 SEQ # END-STATE-NAMES 1 @ z @ 3 @ 4 CD
- 5. CD 6 @>
7 CD m IO 00 00 SRW3R6 EVENT TREE - LOSS OF ESGR COO ING
- I UNITY I ISltW3 I ARCW3 I VW3 I 2CHSW3 I GSRW3 I SEQ # END-STATE-NAMES 1 @
z @ I 3 I 4 CD 5 ~D 6 7 CD SRW3R10 EVENT TREE - LOSS OF ESGR C01DL1NG
UNITY ISRW3 ARCW3 SSRW3 ZCHSW3 SEQ # END-STATE-NAMES 1 @ z @ 3 @ 4 @ 5 CD m I v::,
- g SRW3D6 EVENT TREE
- LOSS OF ESGR COOLING
TOP EVENT FOR ESGR COOLING LOSS SR PllBQ-SR ILl'I' 014 DUAATION-R 10 POS-fllO FRO.C-POSIO PROB-U3JUO POS-R5 PB0B-'l'3R! Off-MT O\.AATION-C>6 P&.08-W3DIS
Failure to Diagnose Operator Fails ESGR Event SR to Restore Room in POS 6 of Refuel Cooling ofter SR in POS 6 of D-SRW3-XHE R-SRW3-XHE-RC-4
Sof ety valves Not Removed Window 3 Safety Valves Not Ramave in Wincbw 3 S 6 of a Droned Maintenooce Outage POS-D6 OS 6 of a Refuefing POS 10 of a Outage Refueling Outage VW G1 POS-R6 P0S-R10 Pressurizer Pressu-izer Safety Vd>/es Safety Valves Removed in W3R6 Removed in WJR6 PZR-SV-REM:lVEDW3 PZR-SV-REMOVEDW3
SV-W3 ailure to Diagnos Operator Failure o X-Tle CHG Flo ESGR Event SR. i from U2 to U! POS 6 of Refuel D3UZ A-SRW3-XHE-CW-4 D-SRW3-XHE A-SRW3-XHE-2CH-4
Cross-Tie of U2 CHG Flow 1n SR, POS 6 Refueling ailure to Di agnos Operator Failure o X-Tle CHG Flo ESGR Event SR i from U2 to Ul POS 6 of Refuel D3U2 A-SRW3-XHE-CW-7 D-SRW3-XHE A-SRW3-XHE-2CH-7
Reflux Cooling window 3 Faore lo DioQnose RCS Locps Isolated L099 or RHR Even1 1o CoU98 Fcitre il POS 6 of RcfkJx Cooing tTl I \0 \0 °' D-SRWS-XHII INSlF FLOW TO SG FRI.I AT LEAST 1 WH PU.t' SBl 3C5 SBJ 3D5 A-SRW3-XHE-SF-5 Operator Faore FALURE Cf" to Bleed the SECONOARf SIDE SG* 1 rj,en LI H::AT REMOJ,!J.. 8SHWZ3 PCRV1 5SHWZ3 A-SRW3-XHl!l-S1-5 A-SRW3-XHE-S2-5
Cross-Tie of U2 CHG Flow 1n SR, POS 6 Refueling trl I \0 ~ ailure to Di agnos Operator Failure o X-Tle CHG Flo1 ESGR Event SR i from U2 to Ul POS 6 of Refuel D3UZ A-SRW3-XHE-CW-7 D-SRW3-XHE A-SRW3-XHE-2CH-7
Gravity from RWST 1n SR Gravity from RWsr in SR, POS 6 of Refueling Safety Valve Removed SV-W3 INSLf FLOW Fcilure to Diagnose Operator Foih.re OUGH LOW HEAD Loss of RHR Event to establish NJECTION FLOW in POS 6 gravity feed PATH D6-CG D-SRW3-XJIE A-SRW3-XHE-G-!5 e *
- Safety Valves Removed ,n Window 3 Safety Valve Removed in Window 3
tTl I \0 POS 6 of a Drained \0 Maintenance Outage \0 POS-D6 POS 6 of a Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueing Outage Safety Valves Removed in W3R6 Removed in W3R6
*poS-R5 PZR-SV-REMOVEDW3 P0S-R10 PZR-SV-REMOVEDW3
UNITY ISRW4 ARCW4- VW4- ZCHSW4 GSRW4 SEQ # END-STATE-NAMES 1 @ z @ 3 @ 4 @ 5 CD 6 @ 7 CD ....t;r1 0 0 0 SRW4R6 EVENT TREE - LOSS OF ESGR CO LING
I UNITY I ISRW4 I ARCW4 I VW4 J zcHSW4 I GSRW4 I SEQ # END-STATE-NAMES 1 @ I 2 @ l I 3 @
- I 4 5 CD 6 @
7 CD SRW4R10 EVENT TREE - LOSS OF ESGR CO DLING
-- UNITY ISRW4 ARCW4 SSRW4 2CHSW4 SEQ # END-STATE-NAMES 1 @ 2 @ 3 @ 4 @ 5 CD SRW406 EVENT TREE
- LOSS OF ESGR COOLING
TOP EVENT FOR ESGR COOLING LOSS SR PR!Q-9R
!LlT GU p
DURATION-R 10 REl'\JD.. POS~1Q FR.'.C-POS1Q PROB-WlRlO POS~6 PR0B-W~R5 DR-tJT PROB-11'*Da
tTl I 0 0 ""'" Failure to Diagnose O~erator Fails ESGR Event SR to Restore Room in POS 6 of Refuel Cooling after SR in POS 6 of D-SRW4-XHE R-SRW4-XHE-RC-5
Safety valves Not Removed. Window 4 Safety Valves Not Remove in Window 4 S 6 of a Drcined Manter.once Outage VW G7 POS-D6 OS 6 of o Refueling POS 10 of a Outage Refueling Outage P0S-R6 P0S-R10 Pressurizer Press1.rizer S<lfety Vdves Safety Valves Removed in W4R6 Removed in W4R6 PZR-SV-REMOYEDW4 PZR-SV-REMOVEDW4
Reflux Cooling window 4 RCS Loops Isolated to CaU9e Foiire of Reflux Cooing 190-W4-INSlF FLOW TO SG FRM AT LEAST 1 MW PUt.P SB1 ~ A.-SR.W4-XHE-SP-!I Operator Faure FALL.RE OF FALTO Q.OSE FAll..RE r::F to Bleed the SECOMJARY SIDE BOTH PORVS SECONDARY SIDE SGs 1 ,j,,en LI f£AT REMOJAL I-EAT REMCWAL SSB'/14 PCRl/1 SSBYf4 A-SR.'11'4-XH!-Sl-!I A-SR'l\'4-XBB-SZ-5
Cross-Tie of U2 CHG Flow 1n SR, POS 6 Refueling m 0 I 0 -..J ailure to Di a11:nos Operator Fall ure ESGR Event SR i o X-Tle CHG Flo, POS 6 of Refuel from UZ to Ul D3UZ A-SRW4--XHE-CW-:S D-SRW4-XHE A-SRW 4--XHE-ZCH-:5
Cross-Tie of U2 CHG Flow 1n SR, POS 6 Refueling trl I I-"' 0 0 00 ailure to Dia.11:nos Operator Failure ESGR Event SR 1 o X-Tle CHG Flo POS 6 of Refuel from U2 to Ul D3U2 A-SRW4--XHE-CW-7 D-SRW4--XHE A-SRW4--XHE-2CH-7
Gravity from RWST 1n SR Gravity from Rwsr in SR, POS 6 of Refuaring tTl 0 0 I \0 Safety Valve Removed SV-W4 INSLf FLOW Fd~re to Diagnose Operator Foihse OUGH LOW 1-£.AD Loss of RHR Evant to estd>lish N.ECTION FLOW in POS 6 gravity feed PATH D6-CG D-SR"'lf~-XHE A-SRW4-XHE-G-O
Safety Valves Removed Window 4 Sofety Valve Removed in Window 4 tt1 0 0 POS 6 of a Drained Maintenance Outage POS-D6 POS 6 of o Refuelin Pressurizer POS 10 of a Pressurizer Outage Safety Vdves Refueing Outage Safety Valves Removed in W4R6 Removed in W4R6 P0S-R6 PZR-SV-REMOYEDW4 POS-R10 PZR-SV-REMOVEDW4
Kiyoharu Abe
- Ephraim Asculai Dept. 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 Vladimar Asmolov Head, Nuclear Safety.Department Sarbes Acharya I. V. Kurchatov Institute Department of Energy of Atomic Enegry:
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om D. Brown A. L. Camp andia National Laboratories Division 6412
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'*/ p .{.
- s. Daggupaty NUS Environment Cana~
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- USNRC
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NRC FORM 335 U.S. NUCLEAR REGULATORY COMMl~SION 1. REPORT NUMBER (2-89) (Aalgnld by NRC. Add Vol., SUpp,, Rov.,
- NRCM 1102, ond Addendum Numbers, If onv.l 3201, 3202 BIBLIOGRAPHIC DATA SHEET (See instructions on the reverse)
NUREG/CR-6144 AND.SUBTITLE BNL-NUREG-52399 uation of Potential Severe Accidents During Low Vol.2, Part 3B 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.9-E.16)
L1922
- 5. AUTHOR(S) 6. TYPE OF REPORT T.L. Chu,?. Musicki, P. Kohut, D. Bley 1, J.Yang,
- 1 B. Holpies , G. ~ozoki, C.J Hsu, D.J. piamond, D. Johnso~ ,
3 J. Lin , R.F. Su , V. Dang , D. Ilberg , S.M. Wong, N. Siu 7. PERIOD COVERED /lnclusive'Dates/
- 8. PERFORMING ORGANIZATION - NAME AND ADDRESS (If NRC, provide Division, Office or Region, U.S. Nuclear Regulatory Commission, and mailing address; if contractor, provide name snd mailing addmss.)
1 Brookhaven National Laboratory PLO Inc., 4590 McArthur Blvd, Newport Bch, CA 92660-2027 2 Upton, NY 11973 AEA Technology, Winfrith, Dorchester, Dorset, England, DT2 8DH 3MIT, Cambridge, MA 02139 (N, Siu currently at EG&G, Idaho Fails, ID 84315) 4 soreq Nuclear Research Center, Yavne 70600, I~rael
- 9. SPONSOR I NG ORGAN IZA Tl ON - NAME AND ADDRESS /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 LEMENTARY NOTES 1 . ST RACT (200 words or less) 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 Labor,atory (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 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 WO RDS/D ESC R I PTO RS (List words or phrases that will assist researchers Iii locating the report,) 13. AVAILABILITY STATEMENT Surry-1 Reactor-Reactor Shutdown; Surry-1 Reactor-Risk Assessment; Unlimited Surry-2 Reactor-Reactor Shutdown; Surry-2 Reactor-Risk Assessment; 14, SECURITY CLASSIFICATION 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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