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{{#Wiki_filter:NUREG/CR-6850 FIRE PRA METHODOLOGY Module 1 Internal Event, At-Power Probabilistic Risk Assessment Model for SNPP Sample Plant Description Nicholas Melly - Nuclear Regulatory Commission Fire PRA Workshop June 24, 2019 - June 28, 2019 Rockville, MD U.S. NRC HQ
{{#Wiki_filter:NUREG/CR-6850 FIRE PRA METHODOLOGY Module 1 Internal Event, At-Power Probabilistic Risk Assessment Model for SNPP Sample Plant Description Nicholas Melly - Nuclear Regulatory Commission Fire PRA Workshop June 24, 2019 - June 28, 2019 Rockville, MD U.S. NRC HQ


Sample Problems / Sample Plant Fire PRA module will involve hands-on exercises Intent: To illustrate key aspects of the methodology through a cohesive set of sample problems All exercises are built around a common sample plant - the Simple Nuclear Power Plant (SNPP)
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 2 Sample Problems / Sample Plant Fire PRA module will involve hands-on exercises Intent: To illustrate key aspects of the methodology through a cohesive set of sample problems All exercises are built around a common sample plant - the Simple Nuclear Power Plant (SNPP)
The exercises are designed such that taking all modules together presents a fairly complete picture of the FPRA methodology Not every task is covered by the SNPP sample problems Not every aspect of covered tasks are illustrated Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 2
The exercises are designed such that taking all modules together presents a fairly complete picture of the FPRA methodology Not every task is covered by the SNPP sample problems Not every aspect of covered tasks are illustrated


The SNPP: Intent and Approach The SNPP is not intended to reflect either regulatory compliance or good engineering practice It is purely an imaginary construct intended to highlight key aspects of the methodology - Nothing more!
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 3 The SNPP: Intent and Approach The SNPP is not intended to reflect either regulatory compliance or good engineering practice It is purely an imaginary construct intended to highlight key aspects of the methodology - Nothing more!
The SNPP has been kept as simple as possible while still serving the needs of the training modules Aspects of the plant are assumed for purposes of the training exercises, e.g.,:
The SNPP has been kept as simple as possible while still serving the needs of the training modules Aspects of the plant are assumed for purposes of the training exercises, e.g.,:
BOP equipment not covered in detail Some systems are assumed to remain available Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 3
BOP equipment not covered in detail Some systems are assumed to remain available


The SNPP: Plant Characteristics PWR with one primary coolant loop One steam generator, one RCP, one pressurizer Chemical volume control/high-pressure injection system Residual heat removal system Secondary side includes:
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 4 The SNPP: Plant Characteristics PWR with one primary coolant loop One steam generator, one RCP, one pressurizer Chemical volume control/high-pressure injection system Residual heat removal system Secondary side includes:
Main steam and feedwater loop for the single steam generator (not modeled)
Main steam and feedwater loop for the single steam generator (not modeled)
Multiple train auxiliary feedwater system to provide decay heat removal Support systems includes:
Multiple train auxiliary feedwater system to provide decay heat removal Support systems includes:
CCW (not modeled)
CCW (not modeled)
Instrument air AC and DC power Instrumentation See Chapter 2 for complete plant description Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 4
Instrument air AC and DC power Instrumentation See Chapter 2 for complete plant description


The SNPP: Primary Systems P&ID SKID MOUNTED AIR COMPRESSOR OPERATED VIA SOV-1 WITH N2                                                                                    AIR BACKED BY AIR                                                                                  SUPPLY FC AOV-1      MOV-13 (PORV)                                                                CCW                                                        LI-1                   LI-2 SG                                                                  TI-1 FC                                              RWST PT-1 PZR                                        LETDOWN HEAT                                         VCT EXCHANGER OPERATED VIA SOV-2 (AIR)
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 5 The SNPP: Primary Systems P&ID HPI-A HPI-B MOV-1 MOV-9 RHR HEAT EXCHANGER CV-3 CV-4 LETDOWN HEAT EXCHANGER FO MOV-5 MOV-6 CV-2 MOV-2 OPERATED VIA SOV-2 (AIR)
MOV-2 MOV-5  MOV-6 FO RV MOV-7                                                              AOV-3 RCP-1                   OPERATED VIA SOV                                                CV-2 (AIR)                       HPI-A MOV-1 CV-3 MOV-9 MOV-20 HPI-B CV-4 LI-3               LI-4 MOV-3 MOV-4 RHR HEAT EXCHANGER MOV-8 RHR PUMP SNPP CCW                                                                                                      Drawing No.:
TI-1 FC CCW CCW LI-2 LI-1 SKID MOUNTED AIR COMPRESSOR AIR SUPPLY VCT PZR MOV-13 FC OPERATED VIA SOV-1 WITH N2 BACKED BY AIR AOV-1 (PORV)
A-10 Date:
PT-1 SG RV MOV-7 MOV-3 MOV-4 MOV-20 LI-3 LI-4 AOV-3 OPERATED VIA SOV (AIR)
PRIMARY SYSTEM                                                5/23/12 P&ID Revision No.:
RHR PUMP MOV-8 RWST 3
3 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 5
5/23/12 A-10 Revision No.:
Date:
Drawing No.:
PRIMARY SYSTEM P & I D SNPP RCP-1


The SNPP: Secondary Systems P&ID ATOMOSPHERE RELIEF VALVE AOV-4 FC TO TURBINE CONDENSER MSIV SG                                               GOVERNOR STEAM TURBINE MOV-14             MOV-15 CST LI-5        LI-6 MOV-11 AFW-B (STEAM)     A-1              V-11 L.O.
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 6 SG MOV-14 MOV-15 MOV-11 MOV-10 MOV-18 MOV-19 MOV-16 MOV-17 MSIV CST AFW-B (STEAM)
MOV-10 AFW-A MOV-18 AFW-C (DIESEL DRIVEN)
AFW-A AFW-C (DIESEL DRIVEN)
FROM FEEDWATER MOV-19 MOV-16 MOV-17 SNPP                          Drawing No.:
V-11 L.O.
A-11 Date:
GOVERNOR FROM FEEDWATER TO TURBINE CONDENSER ATOMOSPHERE RELIEF VALVE AOV-4 A-1 STEAM TURBINE 2
SECONDARY SYSTEM                                5/23/12 P&ID Revision No.:
5/23/12 A-11 Revision No.:
2 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 6
Date:
Drawing No.:
SECONDARY SYSTEM P & I D SNPP LI-6 LI-5 FC The SNPP: Secondary Systems P&ID


The SNPP: Electrical One-Line Diagram SWYD                                                  OFF-SITE POWER G                                                                                                                      EDG-A                                                                                                    EDG-B UAT-1                                                           SUT-1 SWGR-1                                 SWGR-2                                 SWGR-A                                                                                                      SWGR-B RCP-1               Spare                                              HPI-A                     AFW-A                                                 RHR-B                    HPI-B SST-1                                                   SST-2            SST-A                                                                                                                                               SST-B LC-1                                  LC-2                                LC-A                                                                                                                    LC-B COMP-1                                                                           MCC-A1                                                                                  MCC-B1 MCC-1                                  MCC-2 MOV-7 MOV-1   MOV-3   MOV-5                   MOV-10   MOV-13   MOV-16           MOV-2   MOV-4   MOV-6   MOV-8   MOV-9   MOV-17   MOV-20           MOV-18  MOV-19 ATS-1 (Racked Out)
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 7 SWGR-1 RCP-1 UAT-1 SWGR-2 Spare COMP-1 SST-1 LC-1 MCC-1 SST-2 LC-2 MCC-2 BC-1 SWGR-A AFW-A HPI-A SUT-1 SST-A LC-A SWGR-B RHR-B HPI-B SST-B LC-B ATS-1 EDG-A EDG-B G
BC-A                                                                                                                                               BC-B BAT-A                                               BAT-B BC-1 BAT-1                                                             DC BUS-A                                                                                                        DC BUS-B DC BUS-1 Vol Reg INV-A                             PNL-A                                       PNL-B                                                               INV-B             RHR-B HPI-B HPI-A AFW-A MOV-11  MOV-14 NON-VITAL DC MOV-15 LOADS      RCP-1   AOV-4 VITAL-A                                                                                                                                                                VITAL-B SOV-2 SWGR-A                                      SWGR-B EDG-A     SOV-3                        EDG-B LI-1    LI-3  LI-5  SOV-1 TI-1   ANN-1                                                                                                                         PT-1          LI-2    LI-4           LI-6 SNPP                                                        Drawing No.:
MCC-A1 BC-A MOV-1 MOV-3 MOV-5 MOV-7 MOV-10 MOV-13 MOV-16 (Racked Out)
A-12 Date:
BC-B MCC-B1 MOV-2 MOV-4 MOV-6 MOV-8 MOV-9 MOV-17 MOV-20 MOV-19 MOV-18 DC BUS-A VITAL-A TI-1 SOV-1 LI-5 LI-3 ANN-1 INV-A BAT-A DC BUS-B VITAL-B LI-2 LI-4 PT-1 INV-B BAT-B SOV-3 SOV-2 SWGR-B SWGR-A EDG-A PNL-A PNL-B MOV-14 MOV-11 MOV-15 Vol Reg DC BUS-1 BAT-1 RCP-1 NON-VITAL DC LOADS SWYD OFF-SITE POWER 4
ELECTRICAL                                                                               5/23/12 ONE-LINE DIAGRAM Revision No.:
5/23/12 A-12 Revision No.:
4 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 7
Date:
Drawing No.:
ELECTRICAL ONE-LINE DIAGRAM SNPP LI-1 LI-6 EDG-B HPI-A AFW-A RHR-B HPI-B AOV-4 The SNPP: Electrical One-Line Diagram


The SNPP: General Plant Layout - Plan INTAKE 14 STRUCTURE AA SECURITY CST                            BLDG.
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 8 The SNPP: General Plant Layout - Plan SECURITY BLDG.
7 8B DG      DG-B                              CONTAINMENT SWITCH BLDG.
AUX BLDG.
YARD                       8A              12 DG-A TURBINE BLDG.
DG BLDG.
UAT                                                RWST MAIN                                     AUX BLDG.
SWITCH YARD INTAKE STRUCTURE TURBINE BLDG.
TRANSFORMER SUT BATTERY 15 ROOM 1 AA 13 YARD SNPP Drawing No.:
CONTAINMENT RWST AA AA CST DG-B DG-A MAIN TRANSFORMER UAT SUT YARD 14 7
A-01 Date:
12 8B 8A 15 13 BATTERY ROOM 1 1
PLANT LAYOUT 6/22/09 GENERAL            Revision No.:
6/22/09 A-01 Revision No.:
1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 8
Date:
Drawing No.:
PLANT LAYOUT GENERAL SNPP


The SNPP: Plant Layout - Elevation Containment and Auxiliary Building PLANT AIR SOV-1              7 N2 AOV-1 MOV-13 PRESSURIZER
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 9 The SNPP: Plant Layout - Elevation Containment and Auxiliary Building MAIN CONTROL ROOM CABLE SPREADING ROOM SWITCHGEAR ROOMS RHR PUMP ROOM CHARGING PUMP ROOM
                                                                                            +70 FT 1  MAIN CONTROL ROOM
+70 FT
                                                                                            +55 FT 3  CABLE SPREADING ROOM
+55 FT
                                                                                            +40 FT SWITCHGEAR ROOMS              5 6 9 10 11 RCP-1                                        +20 FT MOV-7 CHARGING PUMP ROOM              2
+40 FT
                                                                                            +0 FT GRADE RHR PUMP ROOM              4A 4B
+20 FT
                                                                                            -20 FT SNPP                Drawing No.:
+0 FT GRADE
A-02 PLANT LAYOUT            Date:
-20 FT MOV-7 RCP-1 SOV-1 PRESSURIZER AOV-1 MOV-13 PLANT AIR N2 5
7/21/11 SECTION AA            Revision No.:
6 9 10 11 2
2 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 9
4A 4B 7
1 3
2 7/21/11 A-02 Revision No.:
Date:
Drawing No.:
PLANT LAYOUT SECTION AA SNPP


The SNPP: Auxiliary Building -
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 10 The SNPP: Auxiliary Building -
RHR Pump Room MOV-4    MOV-3 MOV-8 MOV-11      MOV-10 RHR PUMP MOV-14 MOV-20 MOV-15 AFW-B      AFW-A RHR                      NOTES:
RHR Pump Room NOTES:
HX
: 1. VERTICAL PIPE PENETRATION TO UPPER ELEVATION.
: 1. VERTICAL PIPE PENETRATION TO UPPER ELEVATION.
: 2. PENETRATION TO UPPER 4A            NOTE 1              FLOOR IS SEALED.
: 2. PENETRATION TO UPPER FLOOR IS SEALED.
HCBT 0 (NOTE 2)                       4B                                                UP HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY VCBT 10 (NOTE 2)
UP MOV-3 MOV-4 RHR PUMP RHR HX VCBT 10 (NOTE 2)
SNPP                  Drawing No.:
HCBT 0 (NOTE 2)
A-03 Date:
HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY MOV-8 NOTE 1 MOV-20 4B 4A MOV-10 MOV-11 MOV-15 MOV-14 AFW-A AFW-B 2
AUX BLDG 7/21/11 EL. - 20FT            Revision No.:
7/21/11 A-03 Revision No.:
2 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 10
Date:
Drawing No.:
AUX BLDG EL. - 20FT SNPP


The SNPP: Auxiliary Building -
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 11 The SNPP: Auxiliary Building -
Charging Pump Room MOV-9  MOV-1      AOV-3 MOV-5 CV-3 RWST HPI-B                   MOV-6 HPI-A AOV-2 CV-4           CV-2                   NOTE:
Charging Pump Room NOTE:
VCT            1. VERTICAL PIPE PENETRATING LETDOWN            NOTE 1          MOV-2                      THE FLOOR.
: 1. VERTICAL PIPE PENETRATING THE FLOOR.
HX 2
UP VCBT 0A VCBT: VERTICAL CABLE TRAY VCBT 0B MOV-1 MOV-9 AOV-3 HPI-A HPI-B MOV-6 MOV-5 NOTE 1 MOV-2 VCT AOV-2 RWST LETDOWN HX CV-3 CV-4 CV-2 1
UP VCBT: VERTICAL CABLE TRAY VCBT 0A VCBT 0B SNPP                  Drawing No.:
6/22/09 A-04 Revision No.:
A-04 Date:
Date:
AUX BLDG 6/22/09 EL. 0FT               Revision No.:
Drawing No.:
1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 11
AUX BLDG EL. 0FT SNPP 2


The SNPP: Auxiliary Building -
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 12 The SNPP: Auxiliary Building -
Switchgear Rooms 7
Switchgear Rooms UP VCBT +20A VCBT +20B HCBT +35A HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY HCBT +37A SWITCHGEAR ROOM A SWITCHGEAR ROOM B BATTERY ROOM A BATTERY ROOM B 120VAC-A MCC-A 120VAC-B MCC-B SST-A 4KV BUS-A 4KV BUS-B 120V DC-A 120V DC-B SST-B LC-A LC-B BC-A INV-A PNL-A BC-B INV-B PNL-B SWG ACCESS ROOM 6
10                                                        11 BATTERY                                                                                                                       BATTERY 5                                                                                      SWITCHGEAR                                          6 BC-A INV-A PNL-A 120V DC-A 120V DC-B ROOM A                  SWITCHGEAR                                                                                            ROOM B ROOM A                                                    ROOM B SST-A                                                                       SST-B 4KV BUS-B BC-B INV-B PNL-B 4KV BUS-A           LC-A                                                                      LC-B MCC-A                                                                          MCC-B SWG ACCESS                                                                                                                                       HCBT: HORIZONTAL CABLE TRAY ROOM                                                                                                                                           VCBT: VERTICAL CABLE TRAY 120VAC-A                                                                            UP 120VAC-B HCBT +37A 9
5 7
HCBT +35A VCBT +20B                                HCBT +37A VCBT +20A SNPP                  Drawing No.:
10 11 9
A-05 Date:
HCBT +37A 1
AUX BLDG 6/22/09 EL. +20FT             Revision No.:
6/22/09 A-05 Revision No.:
1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 12
Date:
Drawing No.:
AUX BLDG EL. +20FT SNPP


The SNPP: Auxiliary Building -
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 13 The SNPP: Auxiliary Building -
Cable Spreading Room HCBT +50A                                    VCBT +40B VCBT +40A                                 HCBT +50B 3
Cable Spreading Room UP HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY HCBT +50B VCBT +40B VCBT +40A HCBT +50A 3
HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY UP SNPP                    Drawing No.:
1 6/22/09 A-06 Revision No.:
A-06 AUX BLDG                 Date:
Date:
6/22/09 EL. +40FT Revision No.:
Drawing No.:
CABLE SPREADING ROOM 1
AUX BLDG EL. +40FT CABLE SPREADING ROOM SNPP
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 13


The SNPP: Auxiliary Building -
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 14 The SNPP: Auxiliary Building -
Main Control Room 7
Main Control Room UP MAIN CONTROL ROOM KITCHEN MCB SHIFT SUPERVIS OR OFFICE CONTROL ROOM ACCESS 7
MCB MAIN CONTROL ROOM 1
1 1
SHIFT KITCHEN                        SUPERVIS OR OFFICE CONTROL ROOM ACCESS                   UP SNPP        Drawing No.:
6/22/09 A-07 Revision No.:
A-07 Date:
Date:
AUX BLDG 6/22/09 MAIN CONTROL ROOM Revision No.:
Drawing No.:
1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 14
AUX BLDG MAIN CONTROL ROOM SNPP


The SNPP: Turbine Building CST 4KV BUS 1     SST-1     LC-1                                     V-12 AOV-4 4KV BUS 2          SST-2 LC-2 1
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 15 The SNPP: Turbine Building AOV-4 MOV-16 MOV-19 MOV-17 AFW-C (Diesel Driven)
MOV-18 AFW-C (Diesel Driven)
V-12 CST HCBT +10A HCBT +10B 4KV BUS 1 4KV BUS 2 SST-1 LC-1 SST-2 LC-2 250V/DC BUS-1 BC-1 MCC-1 MCC-2 AIR COMPRESSOR 1 MOV-18 ATS BAT-1 BATTERY ROOM 15 12 1
MOV-19 MCC-1     MCC-2                                   MOV-17 MOV-16 12 ATS BC-1 250V/DC BUS-1 HCBT +10A HCBT +10B BATTERY ROOM BAT-1   15                  AIR COMPRESSOR 1 SNPP        Drawing No.:
1 6/22/09 A-08 Revision No.:
A-08 Date:
Date:
TURBINE BLDG 6/22/09 EL. 0FT     Revision No.:
Drawing No.:
1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 15
TURBINE BLDG EL. 0FT SNPP


The SNPP: Main Control Board Layout MOV-14, MOV-15 MOV-17, MOV-16, MOV-19 MOV-13                                                            AUX. FEEDWATER PUMP A, PUMP C AOV-4        AOV-1                                                              MOV-11, MOV-10, MOV-18 TURBINE PT-1                                            SEE DETAIL BELOW MAIN FEED PRESSURELZER DG-A    DG-B AUX.
Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 16 The SNPP: Main Control Board Layout ELECTRICAL TURBINE AND MAIN FEED RX CONTROL PRESSURELZER CONTROL AUX.
CONTROL FEEDWATER ELECTRICAL      TURBINE AND MAIN FEED                      RX CONTROL              HPI + RHR      SW +
FEEDWATER HPI + RHR SW +
CB-1                                 CCW CB-7 CB-6         CB-4            CB-2                      CB-3          CB-5 TI-1                RHR PUMP LI-2                    MOV-5 LI-1                        MOV-6 LI-4                                   MOV-3 LI-3                                    MOV-4 PUMP HPI-A                                    MOV-1 PUMP HPI-B                                    MOV-9 AOV-2 MOV-2                                     AOV-3 MOV-20                                              SNPP                  Drawing No.:
CCW DG-A DG-B AOV-1 PT-1 MOV-13 MOV-14, MOV-15 MOV-17, MOV-16, MOV-19 AUX. FEEDWATER PUMP A, PUMP C MOV-11, MOV-10, MOV-18 SEE DETAIL BELOW LI-1 LI-2 TI-1 MOV-6 MOV-5 RHR PUMP LI-3 LI-4 MOV-4 MOV-3 MOV-9 MOV-1 AOV-3 PUMP HPI-B PUMP HPI-A MOV-2 AOV-2 MOV-8 MOV-7 DETAIL FROM ABOVE TURBINE MAIN FEED CB-6 CB-4 CB-2 CB-1 CB-3 CB-5 CB-7 AOV-4 MOV-20 1
A-09 MOV-7              MOV-8 Date:
6/22/09 A-09 Revision No.:
DETAIL FROM                                                          MAIN CONTROL ROOM 6/22/09 ABOVE MAIN CONTROL BOARD            Revision No.:
Date:
1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 16}}
Drawing No.:
MAIN CONTROL ROOM MAIN CONTROL BOARD SNPP}}

Latest revision as of 01:59, 5 January 2025

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Issue date: 06/13/2019
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NUREG/CR-6850 FIRE PRA METHODOLOGY Module 1 Internal Event, At-Power Probabilistic Risk Assessment Model for SNPP Sample Plant Description Nicholas Melly - Nuclear Regulatory Commission Fire PRA Workshop June 24, 2019 - June 28, 2019 Rockville, MD U.S. NRC HQ

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 2 Sample Problems / Sample Plant Fire PRA module will involve hands-on exercises Intent: To illustrate key aspects of the methodology through a cohesive set of sample problems All exercises are built around a common sample plant - the Simple Nuclear Power Plant (SNPP)

The exercises are designed such that taking all modules together presents a fairly complete picture of the FPRA methodology Not every task is covered by the SNPP sample problems Not every aspect of covered tasks are illustrated

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 3 The SNPP: Intent and Approach The SNPP is not intended to reflect either regulatory compliance or good engineering practice It is purely an imaginary construct intended to highlight key aspects of the methodology - Nothing more!

The SNPP has been kept as simple as possible while still serving the needs of the training modules Aspects of the plant are assumed for purposes of the training exercises, e.g.,:

BOP equipment not covered in detail Some systems are assumed to remain available

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 4 The SNPP: Plant Characteristics PWR with one primary coolant loop One steam generator, one RCP, one pressurizer Chemical volume control/high-pressure injection system Residual heat removal system Secondary side includes:

Main steam and feedwater loop for the single steam generator (not modeled)

Multiple train auxiliary feedwater system to provide decay heat removal Support systems includes:

CCW (not modeled)

Instrument air AC and DC power Instrumentation See Chapter 2 for complete plant description

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 5 The SNPP: Primary Systems P&ID HPI-A HPI-B MOV-1 MOV-9 RHR HEAT EXCHANGER CV-3 CV-4 LETDOWN HEAT EXCHANGER FO MOV-5 MOV-6 CV-2 MOV-2 OPERATED VIA SOV-2 (AIR)

TI-1 FC CCW CCW LI-2 LI-1 SKID MOUNTED AIR COMPRESSOR AIR SUPPLY VCT PZR MOV-13 FC OPERATED VIA SOV-1 WITH N2 BACKED BY AIR AOV-1 (PORV)

PT-1 SG RV MOV-7 MOV-3 MOV-4 MOV-20 LI-3 LI-4 AOV-3 OPERATED VIA SOV (AIR)

RHR PUMP MOV-8 RWST 3

5/23/12 A-10 Revision No.:

Date:

Drawing No.:

PRIMARY SYSTEM P & I D SNPP RCP-1

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 6 SG MOV-14 MOV-15 MOV-11 MOV-10 MOV-18 MOV-19 MOV-16 MOV-17 MSIV CST AFW-B (STEAM)

AFW-A AFW-C (DIESEL DRIVEN)

V-11 L.O.

GOVERNOR FROM FEEDWATER TO TURBINE CONDENSER ATOMOSPHERE RELIEF VALVE AOV-4 A-1 STEAM TURBINE 2

5/23/12 A-11 Revision No.:

Date:

Drawing No.:

SECONDARY SYSTEM P & I D SNPP LI-6 LI-5 FC The SNPP: Secondary Systems P&ID

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 7 SWGR-1 RCP-1 UAT-1 SWGR-2 Spare COMP-1 SST-1 LC-1 MCC-1 SST-2 LC-2 MCC-2 BC-1 SWGR-A AFW-A HPI-A SUT-1 SST-A LC-A SWGR-B RHR-B HPI-B SST-B LC-B ATS-1 EDG-A EDG-B G

MCC-A1 BC-A MOV-1 MOV-3 MOV-5 MOV-7 MOV-10 MOV-13 MOV-16 (Racked Out)

BC-B MCC-B1 MOV-2 MOV-4 MOV-6 MOV-8 MOV-9 MOV-17 MOV-20 MOV-19 MOV-18 DC BUS-A VITAL-A TI-1 SOV-1 LI-5 LI-3 ANN-1 INV-A BAT-A DC BUS-B VITAL-B LI-2 LI-4 PT-1 INV-B BAT-B SOV-3 SOV-2 SWGR-B SWGR-A EDG-A PNL-A PNL-B MOV-14 MOV-11 MOV-15 Vol Reg DC BUS-1 BAT-1 RCP-1 NON-VITAL DC LOADS SWYD OFF-SITE POWER 4

5/23/12 A-12 Revision No.:

Date:

Drawing No.:

ELECTRICAL ONE-LINE DIAGRAM SNPP LI-1 LI-6 EDG-B HPI-A AFW-A RHR-B HPI-B AOV-4 The SNPP: Electrical One-Line Diagram

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 8 The SNPP: General Plant Layout - Plan SECURITY BLDG.

AUX BLDG.

DG BLDG.

SWITCH YARD INTAKE STRUCTURE TURBINE BLDG.

CONTAINMENT RWST AA AA CST DG-B DG-A MAIN TRANSFORMER UAT SUT YARD 14 7

12 8B 8A 15 13 BATTERY ROOM 1 1

6/22/09 A-01 Revision No.:

Date:

Drawing No.:

PLANT LAYOUT GENERAL SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 9 The SNPP: Plant Layout - Elevation Containment and Auxiliary Building MAIN CONTROL ROOM CABLE SPREADING ROOM SWITCHGEAR ROOMS RHR PUMP ROOM CHARGING PUMP ROOM

+70 FT

+55 FT

+40 FT

+20 FT

+0 FT GRADE

-20 FT MOV-7 RCP-1 SOV-1 PRESSURIZER AOV-1 MOV-13 PLANT AIR N2 5

6 9 10 11 2

4A 4B 7

1 3

2 7/21/11 A-02 Revision No.:

Date:

Drawing No.:

PLANT LAYOUT SECTION AA SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 10 The SNPP: Auxiliary Building -

RHR Pump Room NOTES:

1. VERTICAL PIPE PENETRATION TO UPPER ELEVATION.
2. PENETRATION TO UPPER FLOOR IS SEALED.

UP MOV-3 MOV-4 RHR PUMP RHR HX VCBT 10 (NOTE 2)

HCBT 0 (NOTE 2)

HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY MOV-8 NOTE 1 MOV-20 4B 4A MOV-10 MOV-11 MOV-15 MOV-14 AFW-A AFW-B 2

7/21/11 A-03 Revision No.:

Date:

Drawing No.:

AUX BLDG EL. - 20FT SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 11 The SNPP: Auxiliary Building -

Charging Pump Room NOTE:

1. VERTICAL PIPE PENETRATING THE FLOOR.

UP VCBT 0A VCBT: VERTICAL CABLE TRAY VCBT 0B MOV-1 MOV-9 AOV-3 HPI-A HPI-B MOV-6 MOV-5 NOTE 1 MOV-2 VCT AOV-2 RWST LETDOWN HX CV-3 CV-4 CV-2 1

6/22/09 A-04 Revision No.:

Date:

Drawing No.:

AUX BLDG EL. 0FT SNPP 2

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 12 The SNPP: Auxiliary Building -

Switchgear Rooms UP VCBT +20A VCBT +20B HCBT +35A HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY HCBT +37A SWITCHGEAR ROOM A SWITCHGEAR ROOM B BATTERY ROOM A BATTERY ROOM B 120VAC-A MCC-A 120VAC-B MCC-B SST-A 4KV BUS-A 4KV BUS-B 120V DC-A 120V DC-B SST-B LC-A LC-B BC-A INV-A PNL-A BC-B INV-B PNL-B SWG ACCESS ROOM 6

5 7

10 11 9

HCBT +37A 1

6/22/09 A-05 Revision No.:

Date:

Drawing No.:

AUX BLDG EL. +20FT SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 13 The SNPP: Auxiliary Building -

Cable Spreading Room UP HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY HCBT +50B VCBT +40B VCBT +40A HCBT +50A 3

1 6/22/09 A-06 Revision No.:

Date:

Drawing No.:

AUX BLDG EL. +40FT CABLE SPREADING ROOM SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 14 The SNPP: Auxiliary Building -

Main Control Room UP MAIN CONTROL ROOM KITCHEN MCB SHIFT SUPERVIS OR OFFICE CONTROL ROOM ACCESS 7

1 1

6/22/09 A-07 Revision No.:

Date:

Drawing No.:

AUX BLDG MAIN CONTROL ROOM SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 15 The SNPP: Turbine Building AOV-4 MOV-16 MOV-19 MOV-17 AFW-C (Diesel Driven)

V-12 CST HCBT +10A HCBT +10B 4KV BUS 1 4KV BUS 2 SST-1 LC-1 SST-2 LC-2 250V/DC BUS-1 BC-1 MCC-1 MCC-2 AIR COMPRESSOR 1 MOV-18 ATS BAT-1 BATTERY ROOM 15 12 1

1 6/22/09 A-08 Revision No.:

Date:

Drawing No.:

TURBINE BLDG EL. 0FT SNPP

Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 16 The SNPP: Main Control Board Layout ELECTRICAL TURBINE AND MAIN FEED RX CONTROL PRESSURELZER CONTROL AUX.

FEEDWATER HPI + RHR SW +

CCW DG-A DG-B AOV-1 PT-1 MOV-13 MOV-14, MOV-15 MOV-17, MOV-16, MOV-19 AUX. FEEDWATER PUMP A, PUMP C MOV-11, MOV-10, MOV-18 SEE DETAIL BELOW LI-1 LI-2 TI-1 MOV-6 MOV-5 RHR PUMP LI-3 LI-4 MOV-4 MOV-3 MOV-9 MOV-1 AOV-3 PUMP HPI-B PUMP HPI-A MOV-2 AOV-2 MOV-8 MOV-7 DETAIL FROM ABOVE TURBINE MAIN FEED CB-6 CB-4 CB-2 CB-1 CB-3 CB-5 CB-7 AOV-4 MOV-20 1

6/22/09 A-09 Revision No.:

Date:

Drawing No.:

MAIN CONTROL ROOM MAIN CONTROL BOARD SNPP

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