ML16138A335

From kanterella
Jump to navigation Jump to search
ASP Screening Analysis - Reject Fermi Unit 2 (341-15-002)
ML16138A335
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 05/17/2016
From:
Office of Nuclear Regulatory Research
To:
Detroit Edison, Co
References
IR 2015002, LER 15-002-00
Download: ML16138A335 (13)
v • d • e


Text

ASP Screening Analysis - REJECT Accident Sequence Precursor Program - Office of Nuclear Regulatory Research Loss of Both Divisions of the Residual Heat Removal Low Pressure Fermi, Unit 2 Coolant Injection Functions Due to 480-Volt Swing Bus Inoperable Event Date: 3/9/2015 LER: 341-2015-002 IR: 50-341/15-002 Plant Type: General Electric Type 4 BWR with Wet, Mark 1 Containment Plant Operating Mode (Reactor Power Level): Mode 1 (100 Percent Reactor Power)

Analyst: Reviewer: Contributors: BC Approved Date:

Keith Tetter David Aird N/A 5/3/2016 Event Description. On March 9, 2015, a monthly Technical Specifications surveillance test of the 480V electrical swing bus 72CF Automatic Throwover scheme was being conducted. At 3:21 pm, the alternate power supply breaker failed to close as expected after the normal power supply breaker was opened, resulting in a loss of power to Reactor Recirculation Pump discharge valves and both divisions of Residual Heat Removal (RHR) Low Pressure Coolant Injection (LPCI) injection valves.

Consequently, the 72CF Automatic Throwover scheme was declared inoperable. This condition required the plant to enter Limiting Condition for Operation (LCO) 3.0.3. Reactor power was reduced from 100% to 81% in preparation for meeting the requirement to be in Mode 2 within 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.

Operations de-energized and tagged out the 72CF Automatic Throwover scheme to support troubleshooting and maintenance activities in accordance with plant procedures. Following this maintenance activity, post maintenance testing was completed satisfactorily for the contact at 10:11 pm and the plant exited LCO 3.0.3.

Causes. Troubleshooting found a permissive contact in the close circuit for the alternate power supply breaker to be in the incorrect state. Oxidation was found to be the likely cause of the degraded condition of the contact. To remove the oxidation from the contacts, the contacts were de-termed and cleaned.

IR Summary/SDP Result. The inspectors did not identify any performance deficiency associated with this event. The component was about 30 years old, had no history of failures, and no specific preventive maintenance activity existed for cleaning or replacing it. The LER is closed.

Modeling Assumptions. The Fermi Unit 2 SPAR model Revision 8.20, created in May 2014, was used for this analysis. Results of the risk analysis are included in Appendix A at the end of this report.

The following modeling assumptions were used to perform a bounding analysis of this condition:

  • A condition assessment was performed with a duration of 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />, which includes the total length of time the two RHR LPCI injection valves were inoperable.
  • The basic event RHR-MOV-CF-INJEC (RHR LPCI Injection Valves Common Cause Failure to Open) was set to TRUE. This events fails both RHR LPCI injection valves.
  • All other safety systems were available.

SPAR Model Modifications. No SPAR model modifications were needed to perform this analysis.

1

LER 341-2015-002 Rejection Basis. The bounding increase in core damage probability (CDP) for this analysis is 3.9x10-10. The ASP Program threshold is a CDP of 1x10-6. Therefore, this event is not a precursor and is screened out of the ASP Program.

Dominant Sequence. The dominant accident sequence is Medium Loss of Coolant Accident (MLOCA) Sequence 13 (CDP = 8.8x10-11) that contributes approximately 23% of the total internal events CDP. Figure 1 in Appendix B illustrates this sequence. The cut sets/sequences that contribute to the top 95% and/or at least 1% of the total internal events CDP are provided in Appendix A.

The events and important component failures in MLOCA Sequence 13 are:

  • Vapor suppression during MLOCA succeeds,
  • Alternate low pressure injection fails.

2

LER 341-2015-002 Appendix A: SAPHIRE 8 Worksheet Summary of Conditional Event Changes Event Description Cond Value Nominal Value RHR-MOV-CF-INJEC LPCI INJECTION VALVES FAIL FROM COMMON CAUSE TO OPEN True 1.86E-5 Event Tree Dominant Results Only items contributing at least 1.0% to the total CCDP are displayed.

EVENT TREE CCDP CDP CDP DESCRIPTION MLOCA 1.53E-10 8.06E-12 1.45E-10 MEDIUM LOSS-OF-COOLANT ACCIDENT TRANS 1.06E-9 9.83E-10 8.01E-11 GENERAL PLANT TRANSIENT LOOP-I 5.02E-11 1.61E-11 3.41E-11 LOSS OF OFFSITE POWER TO DIVISION I LOCHS 3.11E-9 3.08E-9 2.92E-11 LOSS OF CONDENSER HEAT SINK LOOPGR 4.49E-10 4.29E-10 1.99E-11 LOSS OF OFFSITE POWER (GRID-RELATED)

LLOCA 2.30E-11 3.35E-12 1.97E-11 LARGE LOSS-OF-COOLANT ACCIDENT FWRU 1.68E-10 1.56E-10 1.25E-11 FEEDWATER RAMPUP EVENT (PSA)

LOOPSC 2.50E-10 2.39E-10 1.04E-11 LOSS OF OFFSITE POWER (SWITCHYARD-CENTERED)

LOMFW 9.45E-11 8.75E-11 6.94E-12 LOSS OF MAIN FEEDWATER LOACB301 1.14E-10 1.07E-10 6.19E-12 LOSS OF AC BUS 301 LODWC 1.23E-10 1.18E-10 4.73E-12 LOSS OF DRY WELL COOLING LOOPWR 1.17E-10 1.12E-10 4.44E-12 LOSS OF OFFSITE POWER (WEATHER-RELATED)

Total 6.72E-9 6.34E-9 3.86E-10 Dominant Sequence Results Only items contributing at least 1.0% to the total CCDP are displayed.

EVENT TREE SEQUENCE CCDP CDP CDP DESCRIPTION MLOCA 13 8.82E-11 0.00E+0 8.82E-11 /RPS, /VSS, /HC1, LPI, VA TRANS 62-4 4.44E-11 5.61E-13 4.38E-11 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 MLOCA 04 4.28E-11 5.41E-13 4.22E-11 /RPS, /VSS, /HC1, /LPI, SPC, CSS, /CVS, LI02 TRANS 62-7 3.71E-11 8.38E-13 3.63E-11 /RPS, P2, LPI LOOP-I 20 2.51E-11 5.82E-14 2.50E-11 /RPS, /EPS01, /SRV, SFW, /HPI, SPC, /DEP, LPI, VA LOCHS 06 3.01E-9 2.99E-9 1.44E-11 /RPS, /SRV, /SFW, RHR, PCSR, CVS, LI04 LLOCA 4 1.34E-11 4.53E-14 1.34E-11 /RPS, /VSS, /LPI, SPC, CSS, /CVS, LI02 MLOCA 26 1.17E-11 1.67E-14 1.17E-11 /RPS, /VSS, HC1, /DEP, LPI, VA LOOPGR 18 9.51E-12 0.00E+0 9.51E-12 /RPS, /EPS, /SRV, SFW, /RCI, SPC, /DEP, SDC, CSS,

/CVS, LI LOCHS 61-4 8.06E-12 5.56E-14 8.01E-12 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 FWRU 62-4 7.02E-12 4.84E-14 6.97E-12 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 LOCHS 61-7 6.55E-12 1.51E-13 6.40E-12 /RPS, P2, LPI LLOCA 7 9.02E-12 2.76E-12 6.27E-12 /RPS, /VSS, LPI LOACB301 07 1.08E-10 1.03E-10 5.83E-12 /RPS, /EPS02, /SRV, /SFW, SPC, /DEP, SDC, CSS, CVS, LI04 FWRU 62-7 5.70E-12 1.32E-13 5.57E-12 /RPS, P2, LPI LOOPGR 62 5.26E-12 4.18E-14 5.21E-12 /RPS, /EPS, /SRV, SFW, RCI, HCI, /DEP, LCS, LCI, VA LOOPSC 18 5.10E-12 0.00E+0 5.10E-12 /RPS, /EPS, /SRV, SFW, /RCI, SPC, /DEP, SDC, CSS,

/CVS, LI LOOP-I 37-04 4.34E-12 3.00E-14 4.31E-12 /RPS, /EPS01, P2, /LCS, SPC, CSS, /CVS, LI02 LOMFW 61-4 3.98E-12 2.75E-14 3.95E-12 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 Total 6.72E-9 6.34E-9 3.86E-10 Referenced Fault Trees Fault Tree Description CSS CONTAINMENT SPRAY CVS CONTAINMENT VENTING A-1

LER 341-2015-002 HC1 HPCI HCI HPCI LCI LOW PRESS COOLANT INJECTION LCS CORE SPRAY LI LATE INJECTION LI02 LATE INJECTION LI04 LATE INJECTION AFTER CONTAINMENT VENTING FAILURE LPI LOW PRESSURE INJECTION (CS or LPCI)

P2 TWO OR MORE STUCK OPEN SRVs PCSR POWER CONVERSION SYSTEM RECOVERY RCI RCIC RHR RESIDUAL HEAT REMOVAL SDC SHUTDOWN COOLING SFW STANDBY FEEDWATER SPC SUPPRESSION POOL COOLING VA ALTERNATE LOW PRESS INJECTION Cut Set Report - MLOCA 13 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 1.10E-7 100 Displaying 333 Cut Sets. (333 Original) 1 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND 2 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND 3 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB 4 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC 5 3.41E-9 3.09 IE-MLOCA,ECW-MDP-CF-START 6 1.86E-9 1.68 IE-MLOCA,LCS-MOV-CF-INJEC 7 1.80E-9 1.63 IE-MLOCA,ESW-MDP-FS-PMP2A,ESW-MDP-TM-PMP2B 8 1.80E-9 1.63 IE-MLOCA,ECW-MDP-FS-PUMPA,ESW-MDP-TM-PMP2B 9 1.80E-9 1.63 IE-MLOCA,ECW-MDP-FS-PUMPB,ESW-MDP-TM-PMP2A 10 1.80E-9 1.63 IE-MLOCA,ESW-MDP-FS-PMP2B,ESW-MDP-TM-PMP2A 11 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRND 12 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRNB 13 1.32E-9 1.20 IE-MLOCA,ECW-XHE-XR-PUMPA,ESW-MDP-TM-PMP2B 14 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2A,ESW-XHE-XR-PMP2B 15 1.32E-9 1.20 IE-MLOCA,ECW-XHE-XR-PUMPB,ESW-MDP-TM-PMP2A 16 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNC 17 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNA 18 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2B,ESW-XHE-XR-PMP2A 19 1.28E-9 1.16 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-MOV-CC-F005B 20 1.28E-9 1.16 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-MOV-CC-F005A 21 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPD 22 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPB 23 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPC 24 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPA 25 1.20E-9 1.09 IE-MLOCA,LCS-MDP-CF-START Cut Set Report - TRANS 62-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 5.56E-8 100 Displaying 24 Cut Sets. (24 Original) 1 5.19E-8 93.39 IE-TRANS,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 1.93E-9 3.47 IE-TRANS,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL A-2

LER 341-2015-002 Cut Set Report - MLOCA 04 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 5.35E-8 100 Displaying 24 Cut Sets. (24 Original) 1 5.00E-8 93.40 IE-MLOCA,RHR-XHE-XM-ERROR 2 1.86E-9 3.47 IE-MLOCA,RHR-MOV-CF-MINFL Cut Set Report - TRANS 62-7 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 4.65E-8 100 Displaying 117 Cut Sets. (117 Original) 1 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 2 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 3 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 4 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 5 1.93E-9 4.15 IE-TRANS,LCS-MOV-CF-INJEC,PPR-SRV-OO-2VLVS 6 1.25E-9 2.69 IE-TRANS,LCS-MDP-CF-START,PPR-SRV-OO-2VLVS 7 1.04E-9 2.23 IE-TRANS,PPR-SRV-OO-2VLVS,RHR-STR-CF-NLOCA 8 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 9 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 10 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 11 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 12 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 13 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 14 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 15 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 16 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRNB,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 17 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRNC,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 18 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRND,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 19 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRNA,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 20 7.02E-10 1.51 IE-TRANS,LCS-MDP-CF-RUN,PPR-SRV-OO-2VLVS 21 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 22 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 23 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 24 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 25 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 26 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 27 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 28 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS Cut Set Report - LOOP-I 20 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 3.14E-8 100 Displaying 22 Cut Sets. (22 Original) 1 1.50E-8 47.82 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-XHE-XA-MISALIGN 2 7.50E-9 23.91 IE-LOOP-I,DCP-XHE-XM-2C1,RHR-STR-CF-NLOCA 3 5.34E-9 17.03 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-MDP-TM-PUMPB 4 7.50E-10 2.39 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-XHE-XM-INITIATE 5 7.50E-10 2.39 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-XHE-XR-PUMPB 6 7.22E-10 2.30 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-MOV-CC-F001 7 7.11E-10 2.27 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-MDP-FS-PUMPB A-3

LER 341-2015-002 Cut Set Report - LOCHS 06 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 3.76E-6 100 Displaying 128 Cut Sets. (128 Original) 1 3.54E-6 94.07 IE-LOCHS,CVS-XHE-XM-VENTXRHR,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR 2 6.61E-8 1.76 IE-LOCHS,CVS-AOV-OO-F407,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR 3 6.61E-8 1.76 IE-LOCHS,CVS-AOV-OO-F408,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR 4 6.61E-8 1.76 IE-LOCHS,CVS-AOV-OO-F409,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR Cut Set Report - LLOCA 4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.68E-8 100 Displaying 33 Cut Sets. (33 Original) 1 1.00E-8 59.41 IE-LLOCA,RHR-XHE-XM-EECW 2 5.00E-9 29.70 IE-LLOCA,RHR-XHE-XM-ERROR 3 3.12E-10 1.85 IE-LLOCA,ESW-MDP-TM-PMP2A,RHR-HTX-TM-HTXB 4 3.12E-10 1.85 IE-LLOCA,ESW-MDP-TM-PMP2B,RHR-HTX-TM-HTXA 5 1.86E-10 1.10 IE-LLOCA,RHR-MOV-CF-MINFL Cut Set Report - MLOCA 26 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.46E-8 100 Displaying 141 Cut Sets. (141 Original) 1 1.00E-8 68.45 IE-MLOCA,RHR-STR-CF-MLOCA 2 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC 3 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB 4 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND 5 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND Cut Set Report - LOOPGR 18 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.19E-8 100 Displaying 114 Cut Sets. (114 Original) 1 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 2 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 3 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-BRUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 4 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-ARUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 5 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 6 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 7 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 8 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 9 2.74E-10 2.30 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 10 2.74E-10 2.30 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 11 1.38E-10 1.16 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR A-4

LER 341-2015-002

  1. PROB/FREQ TOTAL% CUT SET 12 1.38E-10 1.16 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 13 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 14 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 15 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 16 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 17 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 18 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 19 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 20 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN Cut Set Report - LOCHS 61-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.01E-8 100 Displaying 10 Cut Sets. (10 Original) 1 9.46E-9 93.79 IE-LOCHS,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 3.52E-10 3.49 IE-LOCHS,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL Cut Set Report - FWRU 62-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 8.78E-9 100 Displaying 10 Cut Sets. (10 Original) 1 8.24E-9 93.79 IE-FWRU,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 3.06E-10 3.49 IE-FWRU,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL Cut Set Report - LOCHS 61-7 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 8.20E-9 100 Displaying 61 Cut Sets. (61 Original) 1 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 2 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 3 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 4 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 5 3.52E-10 4.29 IE-LOCHS,LCS-MOV-CF-INJEC,PPR-SRV-OO-2VLVS 6 2.28E-10 2.78 IE-LOCHS,LCS-MDP-CF-START,PPR-SRV-OO-2VLVS 7 1.89E-10 2.31 IE-LOCHS,PPR-SRV-OO-2VLVS,RHR-STR-CF-NLOCA 8 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 9 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 10 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 11 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 12 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 13 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 14 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 15 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 16 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 17 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS A-5

LER 341-2015-002

  1. PROB/FREQ TOTAL% CUT SET 18 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRND,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 19 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 20 1.28E-10 1.56 IE-LOCHS,LCS-MDP-CF-RUN,PPR-SRV-OO-2VLVS 21 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 22 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 23 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 24 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 25 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 26 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 27 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 28 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS Cut Set Report - LLOCA 7 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.13E-8 100 Displaying 156 Cut Sets. (156 Original) 1 1.00E-9 8.86 IE-LLOCA,RHR-STR-CF-LLOCA 2 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC 3 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB 4 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND 5 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND 6 3.40E-10 3.02 IE-LLOCA,ECW-MDP-CF-START 7 1.86E-10 1.65 IE-LLOCA,LCS-MOV-CF-INJEC 8 1.80E-10 1.60 IE-LLOCA,ECW-MDP-FS-PUMPA,ESW-MDP-TM-PMP2B 9 1.80E-10 1.60 IE-LLOCA,ESW-MDP-FS-PMP2A,ESW-MDP-TM-PMP2B 10 1.80E-10 1.60 IE-LLOCA,ECW-MDP-FS-PUMPB,ESW-MDP-TM-PMP2A 11 1.80E-10 1.60 IE-LLOCA,ESW-MDP-FS-PMP2B,ESW-MDP-TM-PMP2A 12 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2A,ESW-XHE-XR-PMP2B 13 1.32E-10 1.17 IE-LLOCA,ECW-XHE-XR-PUMPA,ESW-MDP-TM-PMP2B 14 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRNB 15 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRND 16 1.32E-10 1.17 IE-LLOCA,ECW-XHE-XR-PUMPB,ESW-MDP-TM-PMP2A 17 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2B,ESW-XHE-XR-PMP2A 18 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNA 19 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNC 20 1.28E-10 1.13 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-MOV-CC-F005B 21 1.28E-10 1.13 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-MOV-CC-F005A 22 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPB 23 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPD 24 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPA 25 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPC 26 1.20E-10 1.07 IE-LLOCA,LCS-MDP-CF-START Cut Set Report - LOACB301 07 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.36E-7 100 Displaying 284 Cut Sets. (284 Original) 1 1.08E-7 79.57 IE-LOACB301,CVS-XHE-XM-VENTXRHR,RHR-XHE-XM-ERROR 2 2.02E-9 1.49 IE-LOACB301,ACP-XHE-XM-64T65T,EPS-DGN-FR-DG13,EPS-DGN-FR-DG14,RHR-HTX-TM-HTXA 3 2.02E-9 1.49 IE-LOACB301,CVS-AOV-OO-F407,RHR-XHE-XM-ERROR 4 2.02E-9 1.49 IE-LOACB301,CVS-AOV-OO-F408,RHR-XHE-XM-ERROR 5 2.02E-9 1.49 IE-LOACB301,CVS-AOV-OO-F409,RHR-XHE-XM-ERROR A-6

LER 341-2015-002 Cut Set Report - FWRU 62-7 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 7.14E-9 100 Displaying 61 Cut Sets. (61 Original) 1 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 2 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 3 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 4 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 5 3.06E-10 4.29 IE-FWRU,LCS-MOV-CF-INJEC,PPR-SRV-OO-2VLVS 6 1.98E-10 2.78 IE-FWRU,LCS-MDP-CF-START,PPR-SRV-OO-2VLVS 7 1.65E-10 2.31 IE-FWRU,PPR-SRV-OO-2VLVS,RHR-STR-CF-NLOCA 8 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 9 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 10 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 11 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 12 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 13 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 14 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 15 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 16 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRNB,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 17 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRNC,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 18 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRND,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 19 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRNA,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 20 1.11E-10 1.56 IE-FWRU,LCS-MDP-CF-RUN,PPR-SRV-OO-2VLVS 21 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 22 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 23 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 24 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 25 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 26 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 27 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 28 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS Cut Set Report - LOOPGR 62 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 6.58E-9 100 Displaying 56 Cut Sets. (56 Original) 1 3.72E-9 56.55 IE-LOOPGR,EPS-XHE-XM-CTG,RHR-STR-CF-NLOCA 2 8.29E-10 12.60 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,RHR-STR-CF-NLOCA 3 4.18E-10 6.35 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,RHR-STR-CF-NLOCA 4 2.65E-10 4.02 IE-LOOPGR,EPS-CTG-TM-11-1,EPS-DGN-FR-BLKSTRT,RHR-STR-CF-NLOCA 5 1.33E-10 2.03 IE-LOOPGR,EPS-CTG-TM-11-1,EPS-DGN-TM-BLKSTRT,RHR-STR-CF-NLOCA 6 1.12E-10 1.70 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-CTG-FR-11-2,EPS-CTG-FR-11-3,EPS-CTG-FR 4,RHR-STR-CF-NLOCA 7 8.42E-11 1.28 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-DGN-FS-BLKSTRT,RHR-STR-CF-NLOCA 8 8.26E-11 1.26 IE-LOOPGR,EPS-CTG-FS-11-1,EPS-DGN-FR-BLKSTRT,RHR-STR-CF-NLOCA A-7

LER 341-2015-002 Cut Set Report - LOOPSC 18 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 6.38E-9 100 Displaying 76 Cut Sets. (76 Original) 1 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 2 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 3 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-BRUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 4 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-ARUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 5 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 6 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 7 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 8 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 9 1.53E-10 2.40 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 10 1.53E-10 2.40 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 11 7.73E-11 1.21 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 12 7.73E-11 1.21 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 13 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 14 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 15 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 16 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 17 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 18 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 19 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 20 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN Cut Set Report - LOOP-I 37-04 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 5.43E-9 100 Displaying 8 Cut Sets. (8 Original) 1 5.11E-9 94.10 IE-LOOP-I,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 1.90E-10 3.50 IE-LOOP-I,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL Cut Set Report - LOMFW 61-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 4.98E-9 100 Displaying 7 Cut Sets. (7 Original) 1 4.69E-9 94.28 IE-LOMFW,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 1.74E-10 3.51 IE-LOMFW,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL A-8

LER 341-2015-002 Referenced Events Event Description Probability ACP-XHE-XM-64T65T OPERATOR FAILS TO ALIGN 4160V MAINT CROSS TIE 65T/64T 2.50E-1 CRD-MDP-FC-ARUN CRD PUMP A IS RUNNING, PUMP B IS IN STANDBY 5.00E-1 CRD-MDP-FC-BRUN CRD PUMP B IS RUNNING, PUMP A IS IN STANDBY 5.00E-1 CVS-AOV-OO-F407 REACTOR BUILDING HVAC ISOLATION FAILS 9.51E-4 CVS-AOV-OO-F408 SBGT ISOLATION FAILS 9.51E-4 CVS-AOV-OO-F409 SBGT ISOLATION FAILS 9.51E-4 CVS-XHE-XM- Operator fails to vent containment given operator fail to establish RHR 5.09E-2 VENTXRHR DCP-XHE-XM-2C1 OPERATOR FAILS TO ALIGN SPARE CHARGER TO REPLACE 2C-1 1.00E-2 ECW-MDP-CF-START DIVISION I, II PUMPS FAIL FROM COMMON CAUSE TO START 3.41E-5 ECW-MDP-FS-PUMPA EECW PUMP A FAILS TO START 1.36E-3 ECW-MDP-FS-PUMPB EECW PUMP B FAILS TO START 1.36E-3 ECW-MDP-TM-PUMPB EECW PUMP B IS IN TEST OR MAINTENANCE 4.79E-3 ECW-XHE-XR-PUMPA OPERATOR FAILS TO RESTORE PUMP A AFTER TEST OR MAINT 1.00E-3 ECW-XHE-XR-PUMPB OPERATOR FAILS TO RESTORE PUMP B AFTER TEST OR MAINT 1.00E-3 EPS-CTG-FR-11-1 CTG 11-1 FAILS TO RUN 1.57E-1 EPS-CTG-FR-11-2 CTG 11-2 FAILS TO RUN 1.57E-1 EPS-CTG-FR-11-3 CTG 11-3 FAILS TO RUN 1.57E-1 EPS-CTG-FR-11-4 CTG 11-4 FAILS TO RUN 1.57E-1 EPS-CTG-FS-11-1 CTG 11-1 FAILS TO START 1.56E-2 EPS-CTG-TM-11-1 CTG 11-1 OUT FOR TEST & MAINTENANCE 5.00E-2 EPS-DGN-FR-BLKSTRT BLACK START DIESEL GENERATOR FOR CTGs 11-2 3 4 FAILS TO RUN 2.85E-2 EPS-DGN-FR-DG13 DIESEL GENERATOR 13 FAILS TO RUN 2.85E-2 EPS-DGN-FR-DG14 DIESEL GENERATOR 14 FAILS TO RUN 2.85E-2 EPS-DGN-FS-BLKSTRT BLACK START DIESEL GENERATOR FOR CTGs 11-2 3 4 FAILS TO START 2.89E-3 EPS-DGN-TM-BLKSTRT BLACK START DG FOR CTGs 11-2 3 4 IS UNAVAILABLE BECAUSE OF 1.43E-2 MAINTENANCE EPS-XHE-XM-CTG OPERATOR FAILS TO START CTG 2.00E-2 ESW-MDP-FS-PMP2A EESW PUMP 2A FAILS TO START 1.36E-3 ESW-MDP-FS-PMP2B EESW PUMP 2B FAILS TO START 1.36E-3 ESW-MDP-TM-PMP2A EESW PUMP 2A IS IN TEST OR MAINTENANCE 1.32E-2 ESW-MDP-TM-PMP2B EESW PUMP 2B IS IN TEST OR MAINTENANCE 1.32E-2 ESW-XHE-XR-PMP2A OPERATOR FAILS TO RESTORE PUMP 2A AFTER TEST OR MAINT 1.00E-3 ESW-XHE-XR-PMP2B OPERATOR FAILS TO RESTORE PUMP 2B AFTER TEST OR MAINT 1.00E-3 HCI-TDP-FR-TRAIN HPCI PUMP TRAIN FAILS TO RUN GIVEN IT STARTED 3.97E-2 IE-FWRU FEEDWATER RAMPUP INITIATING EVENT 1.21E-1 IE-LLOCA LARGE LOCA 1.00E-5 IE-LOACB301 BUS 301 INITIATING EVENT (PSA) 4.24E-3 IE-LOCHS LOSS OF CONDENSER HEAT SINK 1.39E-1 IE-LOMFW LOSS OF FEEDWATER 6.89E-2 IE-LOOPGR LOSS OF OFFSITE POWER INITIATOR (GRID-RELATED) 1.86E-2 IE-LOOP-I LOSS OF OFFSITE POWER TO DIVISION I 7.50E-2 IE-LOOPSC LOSS OF OFFSITE POWER INITIATOR (SWITCHYARD-RELATED) 1.04E-2 IE-MLOCA MEDIUM LOCA 1.00E-4 IE-TRANS GENERAL PLANT TRANSIENT 7.62E-1 LCS-MDP-CF-RUN CORE SPRAY PUMPS FAIL FROM COMMON CAUSE TO RUN 6.76E-6 LCS-MDP-CF-START CORE SPRAY PUMPS FAIL FROM COMMON CAUSE TO START 1.20E-5 LCS-MDP-FS-PUMPA CORE SPRAY PUMP A FAILS TO START 9.47E-4 LCS-MDP-FS-PUMPB CORE SPRAY PUMP B FAILS TO START 9.47E-4 LCS-MDP-FS-PUMPC COR SPRAY PUMP C FAILS TO START 9.47E-4 LCS-MDP-FS-PUMPD CORE SPRAY PUMP D FAILS TO START 9.47E-4 LCS-MDP-TM-TRNA CORE SPRAY TRAIN A IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 LCS-MDP-TM-TRNB CORE SPRAY TRAIN B IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 A-9

LER 341-2015-002 LCS-MDP-TM-TRNC CORE SPRAY TRAIN C IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 LCS-MDP-TM-TRND CORE SPRAY TRAIN D IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 LCS-MOV-CC-F005A LOOP A INJECTION VALVE F005A FAILS TO OPEN 9.63E-4 LCS-MOV-CC-F005B LOOP A INJECTION VALVE F005B FAILS TO OPEN 9.63E-4 LCS-MOV-CF-INJEC CS INJECTION VALVES FAIL FROM COMMON CAUSE 1.86E-5 LCS-XHE-XR-TRNA CORE SPRAY TRAIN A NOT RESTORED AFTER MAINTENANCE 1.00E-3 LCS-XHE-XR-TRNB CORE SPRAY TRAIN B NOT RESTORED AFTER MAINTENANCE 1.00E-3 LCS-XHE-XR-TRNC CORE SPRAY TRAIN C NOT RESTORED AFTER MAINTENANCE 1.00E-3 LCS-XHE-XR-TRND CORE SPRAY TRAIN D NOT RESTORED AFTER MAINTENANCE 1.00E-3 PCS-XHE-XL-LTLCHS OPERATORS FAIL TO RECOVER THE POWER COVERSION SYSTEM 1.00E+0 PPR-SRV-OO-2VLVS TWO OR MORE SRVS FAIL TO CLOSE 1.36E-4 RHR-HTX-TM-HTXA RHR LOOP A HEAT EXCHANGER TRAIN OUT FOR T&M 2.36E-3 RHR-HTX-TM-HTXB RHR LOOP B HEAT EXCHANGER TRAIN OUT FOR T&M 2.36E-3 RHR-MOV-CF-MINFL RHR PUMP MINFLOW LINE MOVS FAIL FROM COMMON CAUSE TO OPEN 1.86E-5 RHR-STR-CF-LLOCA SUPPRESSION POOL STRAINERS FAIL FROM COMMON CAUSE (LLOCA) 1.00E-4 RHR-STR-CF-MLOCA SUPPRESSION POOL STRAINERS FAIL FROM COMMON CAUSE (MLOCA) 1.00E-4 RHR-STR-CF-NLOCA SUPPRESSION POOL STRAINERS FAIL FROM COMMON CAUSE (NON-LOCA) 1.00E-5 RHR-XHE-XM-EECW OPERATOR FAILS TO ALIGN EECW COOLING FLOW 1.00E-3 RHR-XHE-XM-ERROR OPERATOR FAILS TO START/CONTROL RHR 5.00E-4 SFW-MDP-FS-PUMPB SFW PUMP B FAILS TO START 9.47E-4 SFW-MDP-TM-PUMPB SFW PUMP B IS IN TEST OR MAINTENANCE 7.12E-3 SFW-MOV-CC-F001 BOUNDARY VALVE F001 FAILS TO OPEN 9.63E-4 SFW-XHE-XA-MISALIGN FERMI STANDBY FEEDWATER MISALIGNMENT ERROR FOLLOWING 24_107_03 2.00E-2 SFW-XHE-XM-INITIATE OPERATOR FAILS TO INITIATE SBFW INJECTION 1.00E-3 SFW-XHE-XR-PUMPB OPERATOR FAILS TO RESTORE PUMP AFTER TEST OR MAINT 1.00E-3 A-10

LER 341-2015-002 Appendix B: Dominant Sequence Figure 1: MLOCA Sequence 13 B-1

ASP Screening Analysis - REJECT Accident Sequence Precursor Program - Office of Nuclear Regulatory Research Loss of Both Divisions of the Residual Heat Removal Low Pressure Fermi, Unit 2 Coolant Injection Functions Due to 480-Volt Swing Bus Inoperable Event Date: 3/9/2015 LER: 341-2015-002 IR: 50-341/15-002 Plant Type: General Electric Type 4 BWR with Wet, Mark 1 Containment Plant Operating Mode (Reactor Power Level): Mode 1 (100 Percent Reactor Power)

Analyst: Reviewer: Contributors: BC Approved Date:

Keith Tetter David Aird N/A 5/3/2016 Event Description. On March 9, 2015, a monthly Technical Specifications surveillance test of the 480V electrical swing bus 72CF Automatic Throwover scheme was being conducted. At 3:21 pm, the alternate power supply breaker failed to close as expected after the normal power supply breaker was opened, resulting in a loss of power to Reactor Recirculation Pump discharge valves and both divisions of Residual Heat Removal (RHR) Low Pressure Coolant Injection (LPCI) injection valves.

Consequently, the 72CF Automatic Throwover scheme was declared inoperable. This condition required the plant to enter Limiting Condition for Operation (LCO) 3.0.3. Reactor power was reduced from 100% to 81% in preparation for meeting the requirement to be in Mode 2 within 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.

Operations de-energized and tagged out the 72CF Automatic Throwover scheme to support troubleshooting and maintenance activities in accordance with plant procedures. Following this maintenance activity, post maintenance testing was completed satisfactorily for the contact at 10:11 pm and the plant exited LCO 3.0.3.

Causes. Troubleshooting found a permissive contact in the close circuit for the alternate power supply breaker to be in the incorrect state. Oxidation was found to be the likely cause of the degraded condition of the contact. To remove the oxidation from the contacts, the contacts were de-termed and cleaned.

IR Summary/SDP Result. The inspectors did not identify any performance deficiency associated with this event. The component was about 30 years old, had no history of failures, and no specific preventive maintenance activity existed for cleaning or replacing it. The LER is closed.

Modeling Assumptions. The Fermi Unit 2 SPAR model Revision 8.20, created in May 2014, was used for this analysis. Results of the risk analysis are included in Appendix A at the end of this report.

The following modeling assumptions were used to perform a bounding analysis of this condition:

  • A condition assessment was performed with a duration of 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />, which includes the total length of time the two RHR LPCI injection valves were inoperable.
  • The basic event RHR-MOV-CF-INJEC (RHR LPCI Injection Valves Common Cause Failure to Open) was set to TRUE. This events fails both RHR LPCI injection valves.
  • All other safety systems were available.

SPAR Model Modifications. No SPAR model modifications were needed to perform this analysis.

1

LER 341-2015-002 Rejection Basis. The bounding increase in core damage probability (CDP) for this analysis is 3.9x10-10. The ASP Program threshold is a CDP of 1x10-6. Therefore, this event is not a precursor and is screened out of the ASP Program.

Dominant Sequence. The dominant accident sequence is Medium Loss of Coolant Accident (MLOCA) Sequence 13 (CDP = 8.8x10-11) that contributes approximately 23% of the total internal events CDP. Figure 1 in Appendix B illustrates this sequence. The cut sets/sequences that contribute to the top 95% and/or at least 1% of the total internal events CDP are provided in Appendix A.

The events and important component failures in MLOCA Sequence 13 are:

  • Vapor suppression during MLOCA succeeds,
  • Alternate low pressure injection fails.

2

LER 341-2015-002 Appendix A: SAPHIRE 8 Worksheet Summary of Conditional Event Changes Event Description Cond Value Nominal Value RHR-MOV-CF-INJEC LPCI INJECTION VALVES FAIL FROM COMMON CAUSE TO OPEN True 1.86E-5 Event Tree Dominant Results Only items contributing at least 1.0% to the total CCDP are displayed.

EVENT TREE CCDP CDP CDP DESCRIPTION MLOCA 1.53E-10 8.06E-12 1.45E-10 MEDIUM LOSS-OF-COOLANT ACCIDENT TRANS 1.06E-9 9.83E-10 8.01E-11 GENERAL PLANT TRANSIENT LOOP-I 5.02E-11 1.61E-11 3.41E-11 LOSS OF OFFSITE POWER TO DIVISION I LOCHS 3.11E-9 3.08E-9 2.92E-11 LOSS OF CONDENSER HEAT SINK LOOPGR 4.49E-10 4.29E-10 1.99E-11 LOSS OF OFFSITE POWER (GRID-RELATED)

LLOCA 2.30E-11 3.35E-12 1.97E-11 LARGE LOSS-OF-COOLANT ACCIDENT FWRU 1.68E-10 1.56E-10 1.25E-11 FEEDWATER RAMPUP EVENT (PSA)

LOOPSC 2.50E-10 2.39E-10 1.04E-11 LOSS OF OFFSITE POWER (SWITCHYARD-CENTERED)

LOMFW 9.45E-11 8.75E-11 6.94E-12 LOSS OF MAIN FEEDWATER LOACB301 1.14E-10 1.07E-10 6.19E-12 LOSS OF AC BUS 301 LODWC 1.23E-10 1.18E-10 4.73E-12 LOSS OF DRY WELL COOLING LOOPWR 1.17E-10 1.12E-10 4.44E-12 LOSS OF OFFSITE POWER (WEATHER-RELATED)

Total 6.72E-9 6.34E-9 3.86E-10 Dominant Sequence Results Only items contributing at least 1.0% to the total CCDP are displayed.

EVENT TREE SEQUENCE CCDP CDP CDP DESCRIPTION MLOCA 13 8.82E-11 0.00E+0 8.82E-11 /RPS, /VSS, /HC1, LPI, VA TRANS 62-4 4.44E-11 5.61E-13 4.38E-11 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 MLOCA 04 4.28E-11 5.41E-13 4.22E-11 /RPS, /VSS, /HC1, /LPI, SPC, CSS, /CVS, LI02 TRANS 62-7 3.71E-11 8.38E-13 3.63E-11 /RPS, P2, LPI LOOP-I 20 2.51E-11 5.82E-14 2.50E-11 /RPS, /EPS01, /SRV, SFW, /HPI, SPC, /DEP, LPI, VA LOCHS 06 3.01E-9 2.99E-9 1.44E-11 /RPS, /SRV, /SFW, RHR, PCSR, CVS, LI04 LLOCA 4 1.34E-11 4.53E-14 1.34E-11 /RPS, /VSS, /LPI, SPC, CSS, /CVS, LI02 MLOCA 26 1.17E-11 1.67E-14 1.17E-11 /RPS, /VSS, HC1, /DEP, LPI, VA LOOPGR 18 9.51E-12 0.00E+0 9.51E-12 /RPS, /EPS, /SRV, SFW, /RCI, SPC, /DEP, SDC, CSS,

/CVS, LI LOCHS 61-4 8.06E-12 5.56E-14 8.01E-12 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 FWRU 62-4 7.02E-12 4.84E-14 6.97E-12 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 LOCHS 61-7 6.55E-12 1.51E-13 6.40E-12 /RPS, P2, LPI LLOCA 7 9.02E-12 2.76E-12 6.27E-12 /RPS, /VSS, LPI LOACB301 07 1.08E-10 1.03E-10 5.83E-12 /RPS, /EPS02, /SRV, /SFW, SPC, /DEP, SDC, CSS, CVS, LI04 FWRU 62-7 5.70E-12 1.32E-13 5.57E-12 /RPS, P2, LPI LOOPGR 62 5.26E-12 4.18E-14 5.21E-12 /RPS, /EPS, /SRV, SFW, RCI, HCI, /DEP, LCS, LCI, VA LOOPSC 18 5.10E-12 0.00E+0 5.10E-12 /RPS, /EPS, /SRV, SFW, /RCI, SPC, /DEP, SDC, CSS,

/CVS, LI LOOP-I 37-04 4.34E-12 3.00E-14 4.31E-12 /RPS, /EPS01, P2, /LCS, SPC, CSS, /CVS, LI02 LOMFW 61-4 3.98E-12 2.75E-14 3.95E-12 /RPS, P2, /LPI, SPC, CSS, /CVS, LI02 Total 6.72E-9 6.34E-9 3.86E-10 Referenced Fault Trees Fault Tree Description CSS CONTAINMENT SPRAY CVS CONTAINMENT VENTING A-1

LER 341-2015-002 HC1 HPCI HCI HPCI LCI LOW PRESS COOLANT INJECTION LCS CORE SPRAY LI LATE INJECTION LI02 LATE INJECTION LI04 LATE INJECTION AFTER CONTAINMENT VENTING FAILURE LPI LOW PRESSURE INJECTION (CS or LPCI)

P2 TWO OR MORE STUCK OPEN SRVs PCSR POWER CONVERSION SYSTEM RECOVERY RCI RCIC RHR RESIDUAL HEAT REMOVAL SDC SHUTDOWN COOLING SFW STANDBY FEEDWATER SPC SUPPRESSION POOL COOLING VA ALTERNATE LOW PRESS INJECTION Cut Set Report - MLOCA 13 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 1.10E-7 100 Displaying 333 Cut Sets. (333 Original) 1 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND 2 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND 3 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB 4 5.08E-9 4.60 IE-MLOCA,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC 5 3.41E-9 3.09 IE-MLOCA,ECW-MDP-CF-START 6 1.86E-9 1.68 IE-MLOCA,LCS-MOV-CF-INJEC 7 1.80E-9 1.63 IE-MLOCA,ESW-MDP-FS-PMP2A,ESW-MDP-TM-PMP2B 8 1.80E-9 1.63 IE-MLOCA,ECW-MDP-FS-PUMPA,ESW-MDP-TM-PMP2B 9 1.80E-9 1.63 IE-MLOCA,ECW-MDP-FS-PUMPB,ESW-MDP-TM-PMP2A 10 1.80E-9 1.63 IE-MLOCA,ESW-MDP-FS-PMP2B,ESW-MDP-TM-PMP2A 11 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRND 12 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRNB 13 1.32E-9 1.20 IE-MLOCA,ECW-XHE-XR-PUMPA,ESW-MDP-TM-PMP2B 14 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2A,ESW-XHE-XR-PMP2B 15 1.32E-9 1.20 IE-MLOCA,ECW-XHE-XR-PUMPB,ESW-MDP-TM-PMP2A 16 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNC 17 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNA 18 1.32E-9 1.20 IE-MLOCA,ESW-MDP-TM-PMP2B,ESW-XHE-XR-PMP2A 19 1.28E-9 1.16 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-MOV-CC-F005B 20 1.28E-9 1.16 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-MOV-CC-F005A 21 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPD 22 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPB 23 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPC 24 1.25E-9 1.14 IE-MLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPA 25 1.20E-9 1.09 IE-MLOCA,LCS-MDP-CF-START Cut Set Report - TRANS 62-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 5.56E-8 100 Displaying 24 Cut Sets. (24 Original) 1 5.19E-8 93.39 IE-TRANS,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 1.93E-9 3.47 IE-TRANS,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL A-2

LER 341-2015-002 Cut Set Report - MLOCA 04 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 5.35E-8 100 Displaying 24 Cut Sets. (24 Original) 1 5.00E-8 93.40 IE-MLOCA,RHR-XHE-XM-ERROR 2 1.86E-9 3.47 IE-MLOCA,RHR-MOV-CF-MINFL Cut Set Report - TRANS 62-7 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 4.65E-8 100 Displaying 117 Cut Sets. (117 Original) 1 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 2 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 3 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 4 5.27E-9 11.34 IE-TRANS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 5 1.93E-9 4.15 IE-TRANS,LCS-MOV-CF-INJEC,PPR-SRV-OO-2VLVS 6 1.25E-9 2.69 IE-TRANS,LCS-MDP-CF-START,PPR-SRV-OO-2VLVS 7 1.04E-9 2.23 IE-TRANS,PPR-SRV-OO-2VLVS,RHR-STR-CF-NLOCA 8 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 9 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 10 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 11 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 12 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 13 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 14 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 15 7.39E-10 1.59 IE-TRANS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 16 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRNB,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 17 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRNC,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 18 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRND,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 19 7.12E-10 1.53 IE-TRANS,LCS-MDP-TM-TRNA,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 20 7.02E-10 1.51 IE-TRANS,LCS-MDP-CF-RUN,PPR-SRV-OO-2VLVS 21 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 22 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 23 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 24 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 25 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 26 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 27 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 28 7.00E-10 1.51 IE-TRANS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS Cut Set Report - LOOP-I 20 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 3.14E-8 100 Displaying 22 Cut Sets. (22 Original) 1 1.50E-8 47.82 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-XHE-XA-MISALIGN 2 7.50E-9 23.91 IE-LOOP-I,DCP-XHE-XM-2C1,RHR-STR-CF-NLOCA 3 5.34E-9 17.03 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-MDP-TM-PUMPB 4 7.50E-10 2.39 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-XHE-XM-INITIATE 5 7.50E-10 2.39 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-XHE-XR-PUMPB 6 7.22E-10 2.30 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-MOV-CC-F001 7 7.11E-10 2.27 IE-LOOP-I,RHR-STR-CF-NLOCA,SFW-MDP-FS-PUMPB A-3

LER 341-2015-002 Cut Set Report - LOCHS 06 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 3.76E-6 100 Displaying 128 Cut Sets. (128 Original) 1 3.54E-6 94.07 IE-LOCHS,CVS-XHE-XM-VENTXRHR,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR 2 6.61E-8 1.76 IE-LOCHS,CVS-AOV-OO-F407,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR 3 6.61E-8 1.76 IE-LOCHS,CVS-AOV-OO-F408,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR 4 6.61E-8 1.76 IE-LOCHS,CVS-AOV-OO-F409,PCS-XHE-XL-LTLCHS,RHR-XHE-XM-ERROR Cut Set Report - LLOCA 4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.68E-8 100 Displaying 33 Cut Sets. (33 Original) 1 1.00E-8 59.41 IE-LLOCA,RHR-XHE-XM-EECW 2 5.00E-9 29.70 IE-LLOCA,RHR-XHE-XM-ERROR 3 3.12E-10 1.85 IE-LLOCA,ESW-MDP-TM-PMP2A,RHR-HTX-TM-HTXB 4 3.12E-10 1.85 IE-LLOCA,ESW-MDP-TM-PMP2B,RHR-HTX-TM-HTXA 5 1.86E-10 1.10 IE-LLOCA,RHR-MOV-CF-MINFL Cut Set Report - MLOCA 26 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.46E-8 100 Displaying 141 Cut Sets. (141 Original) 1 1.00E-8 68.45 IE-MLOCA,RHR-STR-CF-MLOCA 2 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC 3 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB 4 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND 5 2.01E-10 1.38 IE-MLOCA,HCI-TDP-FR-TRAIN,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND Cut Set Report - LOOPGR 18 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.19E-8 100 Displaying 114 Cut Sets. (114 Original) 1 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 2 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 3 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-BRUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 4 1.23E-9 10.34 IE-LOOPGR,CRD-MDP-FC-ARUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 5 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 6 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 7 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 8 4.45E-10 3.74 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 9 2.74E-10 2.30 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 10 2.74E-10 2.30 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 11 1.38E-10 1.16 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR A-4

LER 341-2015-002

  1. PROB/FREQ TOTAL% CUT SET 12 1.38E-10 1.16 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 13 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 14 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 15 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 16 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 17 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 18 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 19 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-BRUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 20 1.27E-10 1.06 IE-LOOPGR,CRD-MDP-FC-ARUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN Cut Set Report - LOCHS 61-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.01E-8 100 Displaying 10 Cut Sets. (10 Original) 1 9.46E-9 93.79 IE-LOCHS,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 3.52E-10 3.49 IE-LOCHS,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL Cut Set Report - FWRU 62-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 8.78E-9 100 Displaying 10 Cut Sets. (10 Original) 1 8.24E-9 93.79 IE-FWRU,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 3.06E-10 3.49 IE-FWRU,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL Cut Set Report - LOCHS 61-7 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 8.20E-9 100 Displaying 61 Cut Sets. (61 Original) 1 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 2 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 3 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 4 9.61E-10 11.72 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 5 3.52E-10 4.29 IE-LOCHS,LCS-MOV-CF-INJEC,PPR-SRV-OO-2VLVS 6 2.28E-10 2.78 IE-LOCHS,LCS-MDP-CF-START,PPR-SRV-OO-2VLVS 7 1.89E-10 2.31 IE-LOCHS,PPR-SRV-OO-2VLVS,RHR-STR-CF-NLOCA 8 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 9 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 10 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 11 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 12 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 13 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 14 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 15 1.35E-10 1.65 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 16 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRNB,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 17 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRNC,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS A-5

LER 341-2015-002

  1. PROB/FREQ TOTAL% CUT SET 18 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRND,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 19 1.30E-10 1.58 IE-LOCHS,LCS-MDP-TM-TRNA,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 20 1.28E-10 1.56 IE-LOCHS,LCS-MDP-CF-RUN,PPR-SRV-OO-2VLVS 21 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 22 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 23 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 24 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 25 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 26 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 27 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 28 1.28E-10 1.56 IE-LOCHS,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS Cut Set Report - LLOCA 7 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.13E-8 100 Displaying 156 Cut Sets. (156 Original) 1 1.00E-9 8.86 IE-LLOCA,RHR-STR-CF-LLOCA 2 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC 3 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB 4 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND 5 5.08E-10 4.50 IE-LLOCA,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND 6 3.40E-10 3.02 IE-LLOCA,ECW-MDP-CF-START 7 1.86E-10 1.65 IE-LLOCA,LCS-MOV-CF-INJEC 8 1.80E-10 1.60 IE-LLOCA,ECW-MDP-FS-PUMPA,ESW-MDP-TM-PMP2B 9 1.80E-10 1.60 IE-LLOCA,ESW-MDP-FS-PMP2A,ESW-MDP-TM-PMP2B 10 1.80E-10 1.60 IE-LLOCA,ECW-MDP-FS-PUMPB,ESW-MDP-TM-PMP2A 11 1.80E-10 1.60 IE-LLOCA,ESW-MDP-FS-PMP2B,ESW-MDP-TM-PMP2A 12 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2A,ESW-XHE-XR-PMP2B 13 1.32E-10 1.17 IE-LLOCA,ECW-XHE-XR-PUMPA,ESW-MDP-TM-PMP2B 14 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRNB 15 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-XHE-XR-TRND 16 1.32E-10 1.17 IE-LLOCA,ECW-XHE-XR-PUMPB,ESW-MDP-TM-PMP2A 17 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2B,ESW-XHE-XR-PMP2A 18 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNA 19 1.32E-10 1.17 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-XHE-XR-TRNC 20 1.28E-10 1.13 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-MOV-CC-F005B 21 1.28E-10 1.13 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-MOV-CC-F005A 22 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPB 23 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2A,LCS-MDP-FS-PUMPD 24 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPA 25 1.25E-10 1.11 IE-LLOCA,ESW-MDP-TM-PMP2B,LCS-MDP-FS-PUMPC 26 1.20E-10 1.07 IE-LLOCA,LCS-MDP-CF-START Cut Set Report - LOACB301 07 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 1.36E-7 100 Displaying 284 Cut Sets. (284 Original) 1 1.08E-7 79.57 IE-LOACB301,CVS-XHE-XM-VENTXRHR,RHR-XHE-XM-ERROR 2 2.02E-9 1.49 IE-LOACB301,ACP-XHE-XM-64T65T,EPS-DGN-FR-DG13,EPS-DGN-FR-DG14,RHR-HTX-TM-HTXA 3 2.02E-9 1.49 IE-LOACB301,CVS-AOV-OO-F407,RHR-XHE-XM-ERROR 4 2.02E-9 1.49 IE-LOACB301,CVS-AOV-OO-F408,RHR-XHE-XM-ERROR 5 2.02E-9 1.49 IE-LOACB301,CVS-AOV-OO-F409,RHR-XHE-XM-ERROR A-6

LER 341-2015-002 Cut Set Report - FWRU 62-7 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 7.14E-9 100 Displaying 61 Cut Sets. (61 Original) 1 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 2 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 3 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 4 8.36E-10 11.72 IE-FWRU,LCS-MDP-TM-TRNA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 5 3.06E-10 4.29 IE-FWRU,LCS-MOV-CF-INJEC,PPR-SRV-OO-2VLVS 6 1.98E-10 2.78 IE-FWRU,LCS-MDP-CF-START,PPR-SRV-OO-2VLVS 7 1.65E-10 2.31 IE-FWRU,PPR-SRV-OO-2VLVS,RHR-STR-CF-NLOCA 8 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 9 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNB,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 10 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 11 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNC,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 12 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNC,PPR-SRV-OO-2VLVS 13 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRND,LCS-XHE-XR-TRNA,PPR-SRV-OO-2VLVS 14 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRNB,PPR-SRV-OO-2VLVS 15 1.17E-10 1.65 IE-FWRU,LCS-MDP-TM-TRNA,LCS-XHE-XR-TRND,PPR-SRV-OO-2VLVS 16 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRNB,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 17 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRNC,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 18 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRND,LCS-MOV-CC-F005A,PPR-SRV-OO-2VLVS 19 1.13E-10 1.58 IE-FWRU,LCS-MDP-TM-TRNA,LCS-MOV-CC-F005B,PPR-SRV-OO-2VLVS 20 1.11E-10 1.56 IE-FWRU,LCS-MDP-CF-RUN,PPR-SRV-OO-2VLVS 21 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 22 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPB,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 23 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 24 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPC,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS 25 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNC,PPR-SRV-OO-2VLVS 26 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPD,LCS-MDP-TM-TRNA,PPR-SRV-OO-2VLVS 27 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRNB,PPR-SRV-OO-2VLVS 28 1.11E-10 1.56 IE-FWRU,LCS-MDP-FS-PUMPA,LCS-MDP-TM-TRND,PPR-SRV-OO-2VLVS Cut Set Report - LOOPGR 62 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 6.58E-9 100 Displaying 56 Cut Sets. (56 Original) 1 3.72E-9 56.55 IE-LOOPGR,EPS-XHE-XM-CTG,RHR-STR-CF-NLOCA 2 8.29E-10 12.60 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,RHR-STR-CF-NLOCA 3 4.18E-10 6.35 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,RHR-STR-CF-NLOCA 4 2.65E-10 4.02 IE-LOOPGR,EPS-CTG-TM-11-1,EPS-DGN-FR-BLKSTRT,RHR-STR-CF-NLOCA 5 1.33E-10 2.03 IE-LOOPGR,EPS-CTG-TM-11-1,EPS-DGN-TM-BLKSTRT,RHR-STR-CF-NLOCA 6 1.12E-10 1.70 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-CTG-FR-11-2,EPS-CTG-FR-11-3,EPS-CTG-FR 4,RHR-STR-CF-NLOCA 7 8.42E-11 1.28 IE-LOOPGR,EPS-CTG-FR-11-1,EPS-DGN-FS-BLKSTRT,RHR-STR-CF-NLOCA 8 8.26E-11 1.26 IE-LOOPGR,EPS-CTG-FS-11-1,EPS-DGN-FR-BLKSTRT,RHR-STR-CF-NLOCA A-7

LER 341-2015-002 Cut Set Report - LOOPSC 18 Only items contributing at least 1% to the total are displayed.

  1. PROB/FREQ TOTAL% CUT SET 6.38E-9 100 Displaying 76 Cut Sets. (76 Original) 1 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 2 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 3 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-BRUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 4 6.88E-10 10.80 IE-LOOPSC,CRD-MDP-FC-ARUN,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 5 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 6 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 7 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 8 2.49E-10 3.91 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-TM-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 9 1.53E-10 2.40 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 10 1.53E-10 2.40 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-FR-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 11 7.73E-11 1.21 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 12 7.73E-11 1.21 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-CTG-FR-11-1,EPS-DGN-TM-BLKSTRT,ESW-MDP-TM-PMP2B,RHR-XHE-XM-ERROR 13 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 14 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,EPS-XHE-XM-CTG,RHR-XHE-XM-ERROR 15 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 16 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,ECW-MDP-FS-PUMPB,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 17 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 18 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,EPS-XHE-XM-CTG,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR 19 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-BRUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN 20 7.08E-11 1.11 IE-LOOPSC,CRD-MDP-FC-ARUN,ESW-MDP-FS-PMP2B,RHR-XHE-XM-ERROR,SFW-XHE-XA-MISALIGN Cut Set Report - LOOP-I 37-04 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 5.43E-9 100 Displaying 8 Cut Sets. (8 Original) 1 5.11E-9 94.10 IE-LOOP-I,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 1.90E-10 3.50 IE-LOOP-I,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL Cut Set Report - LOMFW 61-4 Only items contributing at least 1% to the total are displayed.
  1. PROB/FREQ TOTAL% CUT SET 4.98E-9 100 Displaying 7 Cut Sets. (7 Original) 1 4.69E-9 94.28 IE-LOMFW,PPR-SRV-OO-2VLVS,RHR-XHE-XM-ERROR 2 1.74E-10 3.51 IE-LOMFW,PPR-SRV-OO-2VLVS,RHR-MOV-CF-MINFL A-8

LER 341-2015-002 Referenced Events Event Description Probability ACP-XHE-XM-64T65T OPERATOR FAILS TO ALIGN 4160V MAINT CROSS TIE 65T/64T 2.50E-1 CRD-MDP-FC-ARUN CRD PUMP A IS RUNNING, PUMP B IS IN STANDBY 5.00E-1 CRD-MDP-FC-BRUN CRD PUMP B IS RUNNING, PUMP A IS IN STANDBY 5.00E-1 CVS-AOV-OO-F407 REACTOR BUILDING HVAC ISOLATION FAILS 9.51E-4 CVS-AOV-OO-F408 SBGT ISOLATION FAILS 9.51E-4 CVS-AOV-OO-F409 SBGT ISOLATION FAILS 9.51E-4 CVS-XHE-XM- Operator fails to vent containment given operator fail to establish RHR 5.09E-2 VENTXRHR DCP-XHE-XM-2C1 OPERATOR FAILS TO ALIGN SPARE CHARGER TO REPLACE 2C-1 1.00E-2 ECW-MDP-CF-START DIVISION I, II PUMPS FAIL FROM COMMON CAUSE TO START 3.41E-5 ECW-MDP-FS-PUMPA EECW PUMP A FAILS TO START 1.36E-3 ECW-MDP-FS-PUMPB EECW PUMP B FAILS TO START 1.36E-3 ECW-MDP-TM-PUMPB EECW PUMP B IS IN TEST OR MAINTENANCE 4.79E-3 ECW-XHE-XR-PUMPA OPERATOR FAILS TO RESTORE PUMP A AFTER TEST OR MAINT 1.00E-3 ECW-XHE-XR-PUMPB OPERATOR FAILS TO RESTORE PUMP B AFTER TEST OR MAINT 1.00E-3 EPS-CTG-FR-11-1 CTG 11-1 FAILS TO RUN 1.57E-1 EPS-CTG-FR-11-2 CTG 11-2 FAILS TO RUN 1.57E-1 EPS-CTG-FR-11-3 CTG 11-3 FAILS TO RUN 1.57E-1 EPS-CTG-FR-11-4 CTG 11-4 FAILS TO RUN 1.57E-1 EPS-CTG-FS-11-1 CTG 11-1 FAILS TO START 1.56E-2 EPS-CTG-TM-11-1 CTG 11-1 OUT FOR TEST & MAINTENANCE 5.00E-2 EPS-DGN-FR-BLKSTRT BLACK START DIESEL GENERATOR FOR CTGs 11-2 3 4 FAILS TO RUN 2.85E-2 EPS-DGN-FR-DG13 DIESEL GENERATOR 13 FAILS TO RUN 2.85E-2 EPS-DGN-FR-DG14 DIESEL GENERATOR 14 FAILS TO RUN 2.85E-2 EPS-DGN-FS-BLKSTRT BLACK START DIESEL GENERATOR FOR CTGs 11-2 3 4 FAILS TO START 2.89E-3 EPS-DGN-TM-BLKSTRT BLACK START DG FOR CTGs 11-2 3 4 IS UNAVAILABLE BECAUSE OF 1.43E-2 MAINTENANCE EPS-XHE-XM-CTG OPERATOR FAILS TO START CTG 2.00E-2 ESW-MDP-FS-PMP2A EESW PUMP 2A FAILS TO START 1.36E-3 ESW-MDP-FS-PMP2B EESW PUMP 2B FAILS TO START 1.36E-3 ESW-MDP-TM-PMP2A EESW PUMP 2A IS IN TEST OR MAINTENANCE 1.32E-2 ESW-MDP-TM-PMP2B EESW PUMP 2B IS IN TEST OR MAINTENANCE 1.32E-2 ESW-XHE-XR-PMP2A OPERATOR FAILS TO RESTORE PUMP 2A AFTER TEST OR MAINT 1.00E-3 ESW-XHE-XR-PMP2B OPERATOR FAILS TO RESTORE PUMP 2B AFTER TEST OR MAINT 1.00E-3 HCI-TDP-FR-TRAIN HPCI PUMP TRAIN FAILS TO RUN GIVEN IT STARTED 3.97E-2 IE-FWRU FEEDWATER RAMPUP INITIATING EVENT 1.21E-1 IE-LLOCA LARGE LOCA 1.00E-5 IE-LOACB301 BUS 301 INITIATING EVENT (PSA) 4.24E-3 IE-LOCHS LOSS OF CONDENSER HEAT SINK 1.39E-1 IE-LOMFW LOSS OF FEEDWATER 6.89E-2 IE-LOOPGR LOSS OF OFFSITE POWER INITIATOR (GRID-RELATED) 1.86E-2 IE-LOOP-I LOSS OF OFFSITE POWER TO DIVISION I 7.50E-2 IE-LOOPSC LOSS OF OFFSITE POWER INITIATOR (SWITCHYARD-RELATED) 1.04E-2 IE-MLOCA MEDIUM LOCA 1.00E-4 IE-TRANS GENERAL PLANT TRANSIENT 7.62E-1 LCS-MDP-CF-RUN CORE SPRAY PUMPS FAIL FROM COMMON CAUSE TO RUN 6.76E-6 LCS-MDP-CF-START CORE SPRAY PUMPS FAIL FROM COMMON CAUSE TO START 1.20E-5 LCS-MDP-FS-PUMPA CORE SPRAY PUMP A FAILS TO START 9.47E-4 LCS-MDP-FS-PUMPB CORE SPRAY PUMP B FAILS TO START 9.47E-4 LCS-MDP-FS-PUMPC COR SPRAY PUMP C FAILS TO START 9.47E-4 LCS-MDP-FS-PUMPD CORE SPRAY PUMP D FAILS TO START 9.47E-4 LCS-MDP-TM-TRNA CORE SPRAY TRAIN A IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 LCS-MDP-TM-TRNB CORE SPRAY TRAIN B IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 A-9

LER 341-2015-002 LCS-MDP-TM-TRNC CORE SPRAY TRAIN C IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 LCS-MDP-TM-TRND CORE SPRAY TRAIN D IS UNAVAILABLE BECAUSE OF MAINTENANCE 7.12E-3 LCS-MOV-CC-F005A LOOP A INJECTION VALVE F005A FAILS TO OPEN 9.63E-4 LCS-MOV-CC-F005B LOOP A INJECTION VALVE F005B FAILS TO OPEN 9.63E-4 LCS-MOV-CF-INJEC CS INJECTION VALVES FAIL FROM COMMON CAUSE 1.86E-5 LCS-XHE-XR-TRNA CORE SPRAY TRAIN A NOT RESTORED AFTER MAINTENANCE 1.00E-3 LCS-XHE-XR-TRNB CORE SPRAY TRAIN B NOT RESTORED AFTER MAINTENANCE 1.00E-3 LCS-XHE-XR-TRNC CORE SPRAY TRAIN C NOT RESTORED AFTER MAINTENANCE 1.00E-3 LCS-XHE-XR-TRND CORE SPRAY TRAIN D NOT RESTORED AFTER MAINTENANCE 1.00E-3 PCS-XHE-XL-LTLCHS OPERATORS FAIL TO RECOVER THE POWER COVERSION SYSTEM 1.00E+0 PPR-SRV-OO-2VLVS TWO OR MORE SRVS FAIL TO CLOSE 1.36E-4 RHR-HTX-TM-HTXA RHR LOOP A HEAT EXCHANGER TRAIN OUT FOR T&M 2.36E-3 RHR-HTX-TM-HTXB RHR LOOP B HEAT EXCHANGER TRAIN OUT FOR T&M 2.36E-3 RHR-MOV-CF-MINFL RHR PUMP MINFLOW LINE MOVS FAIL FROM COMMON CAUSE TO OPEN 1.86E-5 RHR-STR-CF-LLOCA SUPPRESSION POOL STRAINERS FAIL FROM COMMON CAUSE (LLOCA) 1.00E-4 RHR-STR-CF-MLOCA SUPPRESSION POOL STRAINERS FAIL FROM COMMON CAUSE (MLOCA) 1.00E-4 RHR-STR-CF-NLOCA SUPPRESSION POOL STRAINERS FAIL FROM COMMON CAUSE (NON-LOCA) 1.00E-5 RHR-XHE-XM-EECW OPERATOR FAILS TO ALIGN EECW COOLING FLOW 1.00E-3 RHR-XHE-XM-ERROR OPERATOR FAILS TO START/CONTROL RHR 5.00E-4 SFW-MDP-FS-PUMPB SFW PUMP B FAILS TO START 9.47E-4 SFW-MDP-TM-PUMPB SFW PUMP B IS IN TEST OR MAINTENANCE 7.12E-3 SFW-MOV-CC-F001 BOUNDARY VALVE F001 FAILS TO OPEN 9.63E-4 SFW-XHE-XA-MISALIGN FERMI STANDBY FEEDWATER MISALIGNMENT ERROR FOLLOWING 24_107_03 2.00E-2 SFW-XHE-XM-INITIATE OPERATOR FAILS TO INITIATE SBFW INJECTION 1.00E-3 SFW-XHE-XR-PUMPB OPERATOR FAILS TO RESTORE PUMP AFTER TEST OR MAINT 1.00E-3 A-10

LER 341-2015-002 Appendix B: Dominant Sequence Figure 1: MLOCA Sequence 13 B-1

Retrieved from "https://kanterella.com/w/index.php?title=ML16138A335&oldid=2020261"