ML19162A417

01_02 Sample Plant Overview

ML19162A417
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Issue date:	06/13/2019
From:	Nick Melly NRC/RES/DRA
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T. Rivera
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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

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 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 3

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 4

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)

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.:

A-10 Date:

PRIMARY SYSTEM 5/23/12 P&ID Revision No.:

3 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 5

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.

MOV-10 AFW-A MOV-18 AFW-C (DIESEL DRIVEN)

FROM FEEDWATER MOV-19 MOV-16 MOV-17 SNPP Drawing No.:

A-11 Date:

SECONDARY SYSTEM 5/23/12 P&ID Revision No.:

2 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 6

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)

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.:

A-12 Date:

ELECTRICAL 5/23/12 ONE-LINE DIAGRAM Revision No.:

4 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 7

The SNPP: General Plant Layout - Plan INTAKE 14 STRUCTURE AA SECURITY CST BLDG.

7 8B DG DG-B CONTAINMENT SWITCH BLDG.

YARD 8A 12 DG-A TURBINE BLDG.

UAT RWST MAIN AUX BLDG.

TRANSFORMER SUT BATTERY 15 ROOM 1 AA 13 YARD SNPP Drawing No.:

A-01 Date:

PLANT LAYOUT 6/22/09 GENERAL Revision No.:

1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 8

The SNPP: Plant Layout - Elevation Containment and Auxiliary Building PLANT AIR SOV-1 7 N2 AOV-1 MOV-13 PRESSURIZER

+70 FT 1 MAIN CONTROL ROOM

+55 FT 3 CABLE SPREADING ROOM

+40 FT SWITCHGEAR ROOMS 5 6 9 10 11 RCP-1 +20 FT MOV-7 CHARGING PUMP ROOM 2

+0 FT GRADE RHR PUMP ROOM 4A 4B

-20 FT SNPP Drawing No.:

A-02 PLANT LAYOUT Date:

7/21/11 SECTION AA Revision No.:

2 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 9

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:

HX

1. VERTICAL PIPE PENETRATION TO UPPER ELEVATION.

2. PENETRATION TO UPPER 4A NOTE 1 FLOOR IS SEALED.

HCBT 0 (NOTE 2) 4B UP HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY VCBT 10 (NOTE 2)

SNPP Drawing No.:

A-03 Date:

AUX BLDG 7/21/11 EL. - 20FT Revision No.:

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

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:

VCT 1. VERTICAL PIPE PENETRATING LETDOWN NOTE 1 MOV-2 THE FLOOR.

HX 2

UP VCBT: VERTICAL CABLE TRAY VCBT 0A VCBT 0B SNPP Drawing No.:

A-04 Date:

AUX BLDG 6/22/09 EL. 0FT Revision No.:

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

The SNPP: Auxiliary Building -

Switchgear Rooms 7

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

HCBT +35A VCBT +20B HCBT +37A VCBT +20A SNPP Drawing No.:

A-05 Date:

AUX BLDG 6/22/09 EL. +20FT Revision No.:

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

The SNPP: Auxiliary Building -

Cable Spreading Room HCBT +50A VCBT +40B VCBT +40A HCBT +50B 3

HCBT: HORIZONTAL CABLE TRAY VCBT: VERTICAL CABLE TRAY UP SNPP Drawing No.:

A-06 AUX BLDG Date:

6/22/09 EL. +40FT Revision No.:

CABLE SPREADING ROOM 1

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

The SNPP: Auxiliary Building -

Main Control Room 7

MCB MAIN CONTROL ROOM 1

SHIFT KITCHEN SUPERVIS OR OFFICE CONTROL ROOM ACCESS UP SNPP Drawing No.:

A-07 Date:

AUX BLDG 6/22/09 MAIN CONTROL ROOM Revision No.:

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

The SNPP: Turbine Building CST 4KV BUS 1 SST-1 LC-1 V-12 AOV-4 4KV BUS 2 SST-2 LC-2 1

MOV-18 AFW-C (Diesel Driven)

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.:

A-08 Date:

TURBINE BLDG 6/22/09 EL. 0FT Revision No.:

1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 15

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.

CONTROL FEEDWATER ELECTRICAL TURBINE AND MAIN FEED RX CONTROL 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.:

A-09 MOV-7 MOV-8 Date:

DETAIL FROM MAIN CONTROL ROOM 6/22/09 ABOVE MAIN CONTROL BOARD Revision No.:

1 Fire PRA Workshop 2019, Rockville, MD Module 1: Internal Event, At-Power PRA Model for SNPP Slide 16