ML19162A408

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01_03_Exercise_B Task 2 Steps 2 and 3
ML19162A408
Person / Time
Issue date: 06/13/2019
From:
Office of Nuclear Regulatory Research
To:
T. Rivera
Shared Package
ML19162A398 List:
References
Download: ML19162A408 (29)
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Step 2: Review of the Internal Events PRA Against the Fire Safe Shutdown Analysis TABLE 1: SYSTEMS IN PRA MODEL System Description Additional Details Address in Fire PRA Model?

(Y or N)

Comments RCS Reactor Coolant System PORV for pressure relief and feed & bleed.

Stuck-open PORV causes small LOCA.

CVCS Chemical and Volume Control System Normal charging and letdown functions are not modeled. However, components required to isolate the volume control tank and letdown are modeled for HPI mode.

HPI High Pressure Injection System The charging pumps in the CVCS also function as safety injection pumps.

RHR Residual Heat Removal System Shutdown cooling is not modeled. However, the RHR pump and heat exchanger are required for recirculation.

AFW Auxiliary Feedwater System All three trains are modeled.

TABLE 1: SYSTEMS IN PRA MODEL System Description Additional Details Address in Fire PRA Model?

(Y or N)

Comments MFW Main Feed Water Would take considerable effort to get cables involved and their locations MS Main Steam System Stuck-open secondary atmospheric dump valve could cause equivalent of main steam line break.

CS Containment Spray Required for recirculation during LOCA CF Containment Fan Coolers Required for recirculation during LOCA CI Containment Isolation Modeled in LERF ESFAS Emergency Safeguards Actuation System CCW Component Cooling Water System

TABLE 1: SYSTEMS IN PRA MODEL System Description Additional Details Address in Fire PRA Model?

(Y or N)

Comments SW Service Water System AC AC Power (all voltage levels)

To extent power is needed to support equipment in the PRA.

DG Emergency Diesel Generators DC DC Power To extent power is needed to support equipment in the PRA.

IA Instrument Air Required for PORV and other valves.

HVAC-HPI HVAC in HPI Pump Room HVAC is required during 24-hr PRA mission HVAC-RHR HVAC in RHR Pump Room HVAC is required during 24-hr PRA mission

TABLE 2: SYSTEMS IN APPENDIX R System Description Additional Details System function addressed in the Internal Events PRA Model?

(Y or N)

Comments RCS Reactor Coolant System PORV to prevent spurious opening and PORV block valve fails to close results in consequential small LOCA.

CVCS Chemical Volume and Control System Normal charging and letdown functions are credited.

RHR Residual heat Removal System Shutdown cooling is credited AFW Auxiliary Feedwater System Motor-driven and steam -driven AFW pumps are credited.

MS Main Steam System Steam relief for secondary heat removal. Secondary relief valves and MSIVs are also

TABLE 2: SYSTEMS IN APPENDIX R System Description Additional Details System function addressed in the Internal Events PRA Model?

(Y or N)

Comments included to prevent spurious opening causing uncontrolled secondary depressurization.

CCW Component Cooling Water System SW Service Water System AC AC Power (all voltage levels)

But certain buses not credited (especially non-safety) if loads not otherwise required for safe shutdown DG Emergency Diesel Generators DC DC Power But certain buses not credited (especially non-safety) if loads

TABLE 2: SYSTEMS IN APPENDIX R System Description Additional Details System function addressed in the Internal Events PRA Model?

(Y or N)

Comments not otherwise required for safe shutdown IA Instrument Air Required for normal charging and letdown valves.

Y RCS Instruments RCS pressure, temperature, nuclear instrumentation, etc Required for safe shutdown monitoring.

Secondary Instruments Steam Generator level, Streamline pressure, etc.

Required for safe shutdown monitoring.

HVAC-HPI HVAC in HPI Pump Room HVAC is required during 72-hr Appendix R mission HVAC-RHR HVAC in RHR Pump Room HVAC is required during 72-hr Appendix R mission

TABLE 2: SYSTEMS IN APPENDIX R System Description Additional Details System function addressed in the Internal Events PRA Model?

(Y or N)

Comments HVAC-AFW HVAC in AFW Pump Room HVAC is required during 72-hr Appendix R mission

TABLE 3: LIST OF BASIC EVENTS IN PRA MODEL Basic Event Description

%I1 InterfacingSystemsLOCAatRCS/LPIInterface(1MOVand1checkvalveinseries)

%I2 InterfacingSystemsLOCAatRCS/RHRInterface(2MOVsinseries)

%I3 InterfacingSystemsLOCAatRCS/CCWinterface(ReactorCoolantPumpCoolerrupture)

%T1 REACTORTRIP

%T15 LOSSOFCOMPONENTCOOLINGWATER(CCW)

%T23 PARTIALLOADREJECTION

%T25 REACTORTRIPWITHPORVOPENING

%T4 LOSSOFMAINFEEDWATER

%T5C GRIDCENTERDLOSSOFOFFSITEPOWEINITIATINGEVENT

%T5D WEATHERCENTERDLOSSOFOFFSITEPOWEINITIATINGEVENT

%T5P PLANTCENTERDLOSSOFOFFSITEPOWEINITIATINGEVENT

%T6 STEAMLINE/FEEDLINEBREAKUPSTREAMOFMAINSTEAMISOLATIONVALVE AFWAFTR MotordrivenAFWPumpAfailstorun AFWAFTS MotordrivenAFWPumpAfailstostart AFWBFTR SteamdrivensAFWBfailstorun AFWBFTS SteamdrivensAFWBfailstostart AFWCFTR DieseldrivernAFWPumpCfailstorun AFWCFTS DieseldrivernAFWPumpCfailstostart AOV1_FTC PORVAOV1failstoCLOSE AOV1_FTO PORVAOV1failstoopen AOV3_FTC AOV3FAILSTOCLOSE CCW_FAILS FAILUREOFCOMPONENTCOOLINGWATERAFTERTRIP COMP1_FTR AIRCOMPRESSOR1FAILSTORUN

TABLE 3: LIST OF BASIC EVENTS IN PRA MODEL Basic Event Description EPS120VBUSAF 120VBUSAFAULT EPS120VBUSAINVF FAILUREOF120VBUSAINVERTER EPS120VBUSBF 120VBUSBFAULT EPS120VBUSBINVF FAILUREOF120VBUSBINVERTER EPS125VDCBUSAF FAULTON125VDCBUSA EPS125VDCBUSBF FAULTON125VDCBUSB EPS125VDCPNLAF FAULTON125VDCPANELA EPS125VDCPNLBF FAULTON125VDCPANELB EPS480VLC1F 480VLOADCENTER1FAULT EPS480VLC1XTF 480VLOADCENTER1TRANSFORMERFAILS EPS480VLCAF 480VLOADCENTERAFAULT EPS480VLCAXTF 480VLOADCENTERATRANSFORMERFAILS EPS480VLCBF 480VLOADCENTERBFAULT EPS480VLCBXTF 480VLOADCENTERBTRANSFORMERFAILS EPS480VMCCA1F 480VMCCA1FAULT EPS480VMCCB1F 480VMCCB1FAULT EPS4VBUS1F 4KVBUS1FAULT EPS4VBUSAF 4KVBUSAFAULT EPS4VBUSBF 4KVBUSBFAULT EPSBATA FAILUREOFBATTERYA EPSBATB FAILUREOFBATTERYB EPSBCAF FAILUREOFBATTERYCHARGERA EPSBCBF FAILUREOFBATTERYCHARGERB EPSDGAF FAILUREOFDIESELGENERATORA

TABLE 3: LIST OF BASIC EVENTS IN PRA MODEL Basic Event Description EPSDGBF FAILUREOFDIESELGENERATORB HPIA_FTR HPIAfailstorun HPIA_FTS HPIAfailstostart HPIA_HVAC LOSSOFHVACCOOLINGTOHPIPUMPAROOM HPIB_FTR HPIBfailstorun HPIB_FTS HPIBfailstostart HPIB_HVAC LOSSOFHVACCOOLINGTOHPIPUMPBROOM MFWFAIL MAINFEEDWATERSYSTEMFAILUREAFTERREACTORTRIP MOV10_FTO MOV10failstoopen MOV11_FTO MOV11failstoopen MOV14_FTO MOV14FAILSTOOPEN MOV15_FTO MOV15FAILSTOOPEN MOV18_FTO MOV18failstoopen MOV1_FTO MOV1FAILSTOOPEN MOV2_FTC MOV2failstoclose MOV3_FTO MOV3failstoopen MOV4_FTO MOV4failstoopen MOV5_FTC MOV5failstoclose MOV5_FTO MOV5failstoopen MOV6_FTC MOV6failstoclose MOV6_FTO MOV6failstoopen MOV9_FTO MOV9FAILSTOOPEN OPER1 Operatorfailstoswitchovertorecirculation OPER4 Operatorfailstoestablishfeedanbleedcooling

TABLE 3: LIST OF BASIC EVENTS IN PRA MODEL Basic Event Description OPER7 OPERATORFAILSTOTRIPREACTORCOOLANTPUMP PT1_FL PRESSURETRANSMITTERPT1FAILSLOW RCPSEAL RCPSEALLOCAGIVENLOSSOFCCWANDSUCCESSFULRCPTRIP RHRBFTR RHRPUMPBFAILSTORUN RHRBFTS RHRPUMPBFAILSTOSTART RHRBHVAC LOSSOFRHRPUMPBROOMHVACCOOLING SUTF FAILUREOFSTARTUPTRANSFORMER(SUT)

UATF FAILUREOFUNITAUXILIARYTRANSFORMER(UAT)

Continuation of Step2 and Including Steps 4 thru 6:

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments HPI-A High pressure safety injection pump A 4.16kV Bus A Y

HPI-B High pressure safety injection pump B 4.16kV Bus B Y

RHR-B RHR pump 4.16kV Bus B Y

COMP-1 Instrument air compressor 480 V LC 1 Y

AFW-A Motor-driven AFW pump A

4.16kV Bus A Y

AFW-B Steam-driven AFW Pump B

N/A Y

AFW-C Diesel-driven AFW Pump C

NA N

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments AOV-1 (SOV-1)

Pressure operated relief valve 120VAC Bus A

Y (only to ensure remains closed)

AOV-2 (SOV-2)

Letdown isolation valve 125 VDC Bus B

Y (for normal letdown)

AOV-3 (SOV-3)

Charging pump injection valve 125 VDC Bus B

Y (for normal charging)

AOV-4 Atmospheric dump valve DC-Bus-1 Y

MOV-1 HPI-A discharge valve 480V MCC A1 N

MOV-2 VCT isolation valve 480V MCC B1 Y (for normal suction to charging)

MOV-3 Cont. sump recirc valve 480V MCC A1 N

MOV-4 Cont. sump recirc valve 480V MCC B1 N

MOV-5 RWST isolation valve 480V MCC A1 N

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments MOV-6 RWST isolation valve 480V MCC B1 N

MOV-7 RHR inboard suction valve 480V MCC A1 Y (for shutdown cooling)

MOV-8 RHR outboard suction valve 480V MCC B1 Y (for shutdown cooling)

MOV-9 HPI-B discharge valve 480V MCC B1 N

MOV-10 AFW-A discharge valve 480V MCC A1 Y

MOV-11 AFW-B discharge valve 125 VDC Bus B

Y MOV-13 PORV block valve 480V MCC A1 Y

MOV-14 AFW-B turbine steam line isolation valve 125 VDC Bus B

Y MOV-15 AFW-B steam inlet throttle valve 125 VDC Bus B

Y

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments MOV-16 AFW-A test line isolation valve 480V MCC A1 N

MOV-17 AFW-B test line isolation valve 480V MCC B1 N

MOV-18 AFW-C discharge valve 480 V MCC-B1 N

MOV-19 AFW-C test line isolation valve 480 V MCC-B1 N

MOV-20 Shutdown cooling discharge valve 480 V MCC-B1 Y

LI-1 RWST level 120VAC Bus A

Y LI-2 RWST level 120VAC Bus B

Y LI-3 Containment sump level 120VAC Bus A

N

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments LI-4 Containment sump level 120VAC Bus B

N LI-5 SG secondary level 120VAC Bus A

Y LI-6 SG secondary level 120VAC Bus B

Y TI-1 Letdown heat exchanger outlet temperature 120VAC Bus A

N PT-1 RCS pressure 120VAC Bus B

Y A-1 AFW-B motor high temp 120VAC Bus A

N SWGR-A Train A 4160 V Bus SUT-1 EDG-A Y

SWGR-B Train B 4160 V Bus SUT-1 Y

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments EDG-B SWGR-1 Non-Safety 4160 V Bus UAT-1 SUT-1 Y

SWGR-2 Non-Safety 4160 V Bus UAT-1 SUT-1 N

SUT-1 Startup Transformer OSP Y

UAT-1 Auxiliary Transformer Main generator N

EDG-A Train A Emergency Diesel Generator PNL-A Y

EDG-B Train B Emergency Diesel Generator PNL-B Y

LC-1 Non-Safety 480 V Load Center SST-1 Y

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments LC-2 Non-Safety 480 V Load Center SST-2 N

LC-A Train A 480 V Load Center SST-A Y

LC-B Train B 480 V Load Center SST-B Y

SST-1 Non-Safety Station Service Transformer SWGR-1 Y

SST-2 Non-Safety Station Service Transformer SWGR-2 N

SST-A Train A Station Service Transformer SWGR-A Y

SST-B Train B Station Service Transformer SWGR-B Y

MCC-1 Non-Safety 480 V Motor LC-1 Y

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments Control Center MCC-2 Non-Safety 480 V Motor Control Center LC-2 N

MCC-A1 Train A 480 V Motor Control Center LC-A Y

MCC-B1 Train B 480 V Motor Control Center LC-B Y

BC-1 Non-Safety Swing Battery Charger MCC-1 MCC-2 Y

BC-A Train A Battery Charger MCC-A1 Y

BC-B Train B Battery Charger MCC-B1 Y

BAT-1 Non-Safety Battery N/A Y

BAT-A Train A Battery N/A Y

BAT-B Train B Battery N/A Y

DC BUS-1 Non-Safety 125 VDC Bus BC-1 Y

TABLE 4: DISPOSTION OF COMPONENTS IN PRA AND APPENDIX R (USE TABLES 1-3 AND FIGURES 1-3)

Equipment ID Equipment Description Power Supply In PRA Model? (Y or N)

In Appendix R? (Y or N)

Add to Fire PRA Equipment List? (Y or N)

Comments BAT-1 DC BUS-A Train A 125 VDC Bus BC-A BAT-A Y

DC BUS-B Train B 125 VDC Bus BC-B BAT-B Y

INV-A Train A Inverter DC BUS-A Y

INV-B Train B Inverter DC BUS-B Y

VITAL-A Train A 120 VAC Vital Bus INV-A Y

VITAL-B Train B 120 VAC Vital Bus INV-B Y

PNL-A Train A 125 VDC Panel DC BUS-A Y

PNL-B Train B 125 VDC Panel DC BUS-B Y

Step 3: Identify Fire-Induced Initiating Events Based on Equipment Affected Will need to examine each fire compartment / analysis unit and determine based on the equipment and cables located there, which of the initiators (from Step 1 of Task 2) can be caused by a fire in that compartment / analysis unit. If any new initiators are identified, include in the Fire PRA. The Fire PRA will then include fires mapped to initiating events in the model. Each compartment / analysis unit should have a disposition with regard to the initiating event(s) that occur as a result of a fire in each location (even if none).

INITIATINGEVENTSININTERNALEVENTSPRA InitiatingEvent Description

%I1 InterfacingSystemsLOCAatRCS/LPIInterface(1MOVand1checkvalveinseries)

%I2 InterfacingSystemsLOCAatRCS/RHRInterface(2MOVsinseries)

%I3 InterfacingSystemsLOCAatRCS/CCWinterface(ReactorCoolantPumpCoolerrupture)

%T1 REACTORTRIP

%T15 LOSSOFCOMPONENTCOOLINGWATER(CCW)

%T23 PARTIALLOADREJECTION

%T25 REACTORTRIPWITHPORVOPENING

%T4 LOSSOFMAINFEEDWATER

%T5C GRIDCENTERDLOSSOFOFFSITEPOWEINITIATINGEVENT

%T5D WEATHERCENTERDLOSSOFOFFSITEPOWEINITIATINGEVENT

%T5P PLANTCENTERDLOSSOFOFFSITEPOWEINITIATINGEVENT

%T6 STEAMLINE/FEEDLINEBREAKUPSTREAMOFMAINSTEAMISOLATIONVALVE

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s) 1 AFW-A AFW-B AFW-C A-1 AOV-1 AOV-2 AOV-3 AOV-4 LC-1 LC-2 LC-A LC-B SWGR-1 SWGR-2 SWGR-A SWGR-B EDG-A EDG-B HPI-A HPI-B LI-1 LI-2 LI-3 LI-4 LI-5 LI-6 MFW MOV-1 Motor-driven AFW pump A Steam-driven AFW pump B Diesel-driven AFW pump C AFW motor high temperature Power operated relief valve Letdown isolation valve Charging pump injection valve Atmospheric dump valve Non-safety 480 V load center 1 Non-safety 480 V load center 2 Train A 480 V load center Train B 480 V load center Non-safety 4160 V switchgear 1 Non-safety 4160 V switchgear 2 Train A 4160 V switchgear Train B 4160 V switchgear Train A emergency diesel generator Train B emergency diesel generator High pressure safety injection pump A High pressure safety injection pump B RWST level instrument RWST level instrument Containment sump level instrument Containment sump level instrument SG secondary level instrument SG secondary level instrument Main feedwater HPI discharge valve

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s)

MOV-10 MOV-11 MOV-13 MOV-14 MOV-15 MOV-18 MOV-2 MOV-3 MOV-4 MOV-5 MOV-6 MOV-9 PT-1 RCP-1 SUT-1 TI-1 AFW pump A discharge valve AFW pump B discharge valve PORV block valve AFW pump B steam line isolation valve AFW pump B steam inlet throttle valve AFW pump C discharge valve VCT isolation valve Cont. sump recirc. valve Cont. sump recirc. valve RWST isolation valve RWST isolation valve HPI discharge valve RCS pressure instrument Reactor coolant pump 1 Startup transformer Letdown heat exchanger outlet temperature 2

A-1 AOV-2 AOV-3 HPI-A HPI-B MFW MOV-1 MOV-2 MOV-3 MOV-4 MOV-5 MOV-6 AFW motor high temperature Letdown isolation valve Charging pump injection valve High pressure safety injection pump A High pressure safety injection pump B Main feedwater HPI discharge valve VCT isolation valve Cont. sump recirc. valve Cont. sump recirc. valve RWST isolation valve RWST isolation valve

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s)

MOV-9 RCP-1 TI-1 HPI discharge valve Reactor coolant pump 1 Letdown heat exchanger outlet temperature 3

AFW-A AFW-B AFW-C A-1 AOV-1 AOV-2 AOV-3 AOV-4 INV-A INV-B LC-1 LC-2 LC-A LC-B SWGR-1 SWGR-2 SWGR-A SWGR-B EDG-A EDG-B HPI-A HPI-B LI-1 LI-2 LI-3 Motor-driven AFW pump A Steam-driven AFW pump B Diesel-driven AFW pump C AFW motor high temperature Power operated relief valve Letdown isolation valve Charging pump injection valve Atmospheric dump valve Train A inverter Train B inverter Non-safety 480 V load center 1 Non-safety 480 V load center 2 Train A 480 V load center Train B 480 V load center Non-safety 4160 V switchgear 1 Non-safety 4160 V switchgear 2 Train A 4160 V switchgear Train B 4160 V switchgear Train A emergency diesel generator Train B emergency diesel generator High pressure safety injection pump A High pressure safety injection pump B RWST level instrument RWST level instrument Containment sump level instrument

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s)

LI-4 LI-5 LI-6 MFW MOV-1 MOV-10 MOV-11 MOV-13 MOV-14 MOV-15 MOV-18 MOV-2 MOV-3 MOV-4 MOV-5 MOV-6 MOV-9 PT-1 RCP-1 TI-1 Containment sump level instrument SG secondary level instrument SG secondary level instrument Main feedwater HPI discharge valve AFW pump A discharge valve AFW pump B discharge valve PORV block valve AFW pump B steam line isolation valve AFW pump B steam inlet throttle valve AFW pump C discharge valve VCT isolation valve Cont. sump recirc. valve Cont. sump recirc. valve RWST isolation valve RWST isolation valve HPI discharge valve RCS pressure instrument Reactor coolant pump 1 Letdown heat exchanger outlet temperature 9

AFW-A AFW-B A-1 AOV-1 AOV-2 AOV-3 AOV-4 VITAL-A Motor-driven AFW pump A Steam-driven AFW pump B AFW motor high temperature Power operated relief valve Letdown isolation valve Charging pump injection valve Atmospheric dump valve Train A 120 VAC vital bus

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s)

INV-A VITAL-B INV-B MCC-A1 MCC-B1 SWGR-B BC-A BC-B MFW MOV-1 MOV-10 MOV-11 MOV-13 MOV-2 MOV-3 MOV-4 MOV-7 MOV-8 MOV-9 TI-1 Train A inverter Train B 120 VAC vital bus Train B inverter Train A 480 V motor control center Train B 480 V motor control center Train B 4160 V switchgear Train A battery charger Train B battery charger Main feedwater HPI discharge valve AFW pump A discharge valve AFW pump B discharge valve PORV block valve VCT isolation valve Cont. sump recirc. valve Cont. sump recirc. Valve RHR inboard suction valve RHR outboard suction valve HPI discharge valve Letdown heat exchanger outlet temperature 10 AFW-A AOV-1 VITAL-A INV-A DC BUS-A PNL-A LC-A SST-A Motor-driven AFW pump A Power operated relief valve Train A 120 VAC vital bus Train A inverter Train A 125 VDC bus Train A 125 VDC panel Train A 480 V load center Train A station service transformer

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s)

MCC-A1 SWGR-A BAT-A BC-A EDG-A EDG-B HPI-A MFW MOV-1 MOV-3 Train A 480 V motor control center Train A 4160 V switchgear Train A battery Train A battery charger Train A emergency diesel generator Train B emergency diesel generator High pressure safety injection pump A Main feedwater HPI discharge valve Cont. sump recirc. valve 11 AFW-B AOV-4 VITAL-B INV-B DC BUS-B PNL-B LC-B SST-B MCC-B1 SWGR-B BAT-B BC-B HPI-B MFW MOV-11 MOV-2 MOV-4 Motor-driven AFW pump B Atmospheric dump valve Train B 120 VAC vital bus Train B inverter Train B 125 VDC bus Train B 125 VDC panel Train B 480 V load center Train B station service transformer Train B 480 V motor control center Train B 4160 V switchgear Train B battery Train A battery charger High pressure safety injection pump B Main feedwater AFW pump B discharge valve VCT isolation valve Cont. sump recirc. valve

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s) 12 AFW-C AOV-4 COMP1 DC BUS-1 LC-1 SST-1 LC-2 SST-2 MCC-1 MCC-2 SWGR-1 SWGR-2 SWGR-A SWGR-B EPS-ATS1 EPS-BC1 EDG-A EDG-B LI-1 LI-2 LI-3 LI-4 MFW MOV-10 MOV-11 MOV-14 MOV-15 MOV-18 Diesel-driven AFW pump C Atmospheric dump valve Instrument air compressor Non-safety 250 VDC bus Non-safety 480 V load center 1 Non-safety station service transformer 1 Non-safety 480 V load center 2 Non-safety station service transformer 2 Non-safety 480 V motor control center 1 Non-safety 480 V motor control center 2 Non-safety 4160 V switchgear 1 Non-safety 4160 V switchgear 2 Train A 4160 V switchgear Train B 4160 V switchgear Non-safety DC bus transfer switch Non-safety DC bus battery charger Train A emergency diesel generator Train B emergency diesel generator RWST level instrument RWST level instrument Containment sump level instrument Containment sump level instrument Main feedwater AFW pump A discharge valve AFW pump B discharge valve AFW pump B steam line isolation valve AFW pump B steam inlet throttle valve AFW pump C discharge valve

MAPPING OF INITERNAL EVENTS INITIATING EVENTS TO FIRE COMPARTMENT Compartment Equipment Impacted by Fire Equipment Description Internal Events Initiating Event (s)

MOV-5 MOV-6 MOV-7 MOV-8 RCP-1 SUT-1 RWST isolation valve RWST isolation valve RHR inboard suction valve RHR outboard suction valve Reactor coolant pump 1 Startup transformer 13 SWGR-1 SWGR-2 SWGR-A SWGR-B LI-1 LI-2 MFW SUT-1 Non-safety 4160 V switchgear 1 Non-safety 4160 V switchgear 2 Train A 4160 V switchgear Train B 4160 V switchgear RWST level instrument RWST level instrument Main feedwater Startup transformer 15 BAT-1 MFW Non-safety battery Main feedwater

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