ML20237B092

Rev 13 to AP600 PRA for Simplified Passive Advanced LWR Plant Program

ML20237B092
Person / Time
Site:	05200003
Issue date:	08/13/1998
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20237B082	List: ML20237B092 NSD-NRC-98-5749, Forwards Rev 13 to AP600 PRA for Simplified Passive Advanced LWR Plant Program. Rev Represents Final Version of AP600 Pra.All NRC Comments Related to Rev 12 of AP600 PRA Have Been Resolved
References
NUDOCS 9808180042
Download: ML20237B092 (97)

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O Simplified Passive Advanced Light Water Reactor Plant Program AP600 Probabilistic Risk Assessment

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Prepared for U.S. Department of Energy

! San Francisco Operations Office DE-AC03-90SF18495

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TABLE OF CONTENTS Section Title Eage CHAPTER 1 INTRODUCTION 1.1 Background and Overview . .. ... .... . .. . ....... . .... 1-1 1.2 Objectives ............ .......... ......... ........ ...... 1-2 1.3 Technical Scope ....... ............. . ... . . .... .. ..... 1-3 1.4 Project Methodology Overview . . .... .. . ........ ............. 1-4 1.5 Results . . . . . . . . . . ............... ............. . .... 1-6 1.6 Plant Definition . . . . . . . . . .... .... ......... . .... ........ 1-7 1.6.1 General Description . . . . . .. .. .......... .......... 1-7 1.6.2 AP600 Design Improvement as a Result of Probabilistic Risk Assessment Studies ... ............. ...... . . .... . 1-12 1.7 References ..... .... ....... .... .............. .. ...... 1-14 CHAPTER 2 INTERNAL INITIATING EVENTS 2.1 Introduction ... . . .... .. .. ... . .... . . .. ...... . 2-1 2.2 Internal Initiating Event Identification and Categorization . . . . . . . ....... 2-1 2.2.1 Logic Diagram for Internal Initiating Events . . . . . . ... . ...... 2-2 2.2.2 Loss-of-Coolant Accidents . . . . ... ..... ................ 2-3 (q

2.2.3 2.2.4 Transients . . . . . . . . . ... ...... ..........

Anticipated Transient without Scram ........ .. .. . .. ..

..... 2-6 2-9 2.2.5 AP600-Specific Initiating Event Analysis . .......... 2-11 2.2.6 Consequential Events . . . . . . . . . ... . ..... . . .... 2-20 2.2.7 Summary of Interaal Initiating Event Categories . . . . . . ......... 2-21 23 Quantification of Internal Initiating Event Frequencies .... ... .... ... . 2-21 2.3.1 Quantification of LOCA Initiating Event Frequencies . . . . . . . . . .. 2-21 2.3.2 Quantification of Transient Initiating Event Frequencies . . . . . . .. 2-27 2.3.3 ATWS Precursor Initiating Event Frequency . . . . . . . . . . .... .. 2-30 l 2.3.4 Summary of Internal Initiating Event Frequencies . . . ...... . . . . 2-30 2.4 References ............. .... ......... ............. ... 2-30 A~ITACHMENT 2A Q~UANTIFICATION OF LOCA 1hTTIATING EVENT FREQUENCIES l 2A.1 Primary System Pipe Break Frequencies . ........ .... .... ... 2A-1 2A.2 l Reactor Coolant System Leakage Initiating Event Frequency . . . . . . . . . . . . 2A-6 l

2A.3 Steam Generator Tube Rupture Initiating Event Frequency . . . . ....... . 2A-15  ;

2A.4 Interfacing System LOCA Initiating Event Frequency . . ............... 2A-19 l 2A.5 - Quantification of Stuck-open Pressurizer Safety Valve and Accumulator  !

Interface Break and IRWST Interface Break . . ..... ..... . ...... 2A-29  !

2A.6 Quantification Secondary-side Line Breaks and Stuck-open Main Steam Line Safety Valve Frequencies . . . . . . . . . . ...... ... . ..... . . 2A-34 2A.7 Initiating Events Review Data Summary and INPO Data . ...... . ..... 2A-39 l

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0 Section Title Eage CHAlrTER 3 MODELING OF SPECIAL INITIATORS 3.1 Introduction .... .. ....... .............. .. ........ . ... 3-1 3.2 Ground Rules for Special Initiating Event Analysis ..................3-1 3.3 Loss of Compon nt Cooling Water System / Service Water System Initiating Event 3-2 3.4 Loss of Compressei and Instrument Air System Initiating Event ............ 3-2 3.5 Spurious Actuation of Automatic Depressurization System ................ 3-3 3.5.1 Evaluation of Automatic Depressurization System Spurious Actuation . . 3-3 3.6 References ..... ... .. ... .. .. ..... ........ .. ... .. 3-8 CHAPTER 4 EVENT TREE MODELS ....... ..... .. . ........ ... .. .. 4-1 4.1 Introduction ...... .... ... ....... ...... . ........ ... 4-1 4.2 Large LOCA Event Tree Model . . . .... ... .. . .............. 4-3 4.2.1 Event Description . , . . ... . ........... .......... 4-3 4.2.2 Event Tree Model and Nodes .... ...... ......... . ... 4-4 4.2.3 Event Tree Success Paths . . . . . . . . . . . . . ...... . ......... 4-5 4.2.4 Operator Actions . . . . . . . . . . . . ........ ...... .. ... 4-6 4.2.5 Event Tre,e End States . . ........... .... . ... .. ..... 4-6 4.3 Medium LOCA Event Tree Model . . . . . . . . ..... . .............. 4-6 4.3.1 Event Description . . . ................... ............. 4-6 4.3.2 Event Tree Model and Nodes ................... .... .... 4-7 4.3.3 Event Tree Success Paths . . . . . . . ...... ............... . 4-9 4.3.4 Operator Actions . ............ ... ... ............... 4-9 4.3.5 Event Tree End States .............. ............. ... 4-9 4.4 Core Makeup Tank Line Break Event Tree Model . . . . . .. ..... ... . . 4-10 4.4.1 Event Description . ... ............... ........... . 4-10 4.4.2 Event Tree Model and Nodes . ....... ......... . . . . . . 4- 10 4.4.3 Event Tree Success Paths . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 4-12 4.4.4 Operator Actions . . . ............. ............ . . . . 4-12 4.4.5 Event Tree End States . . . . . . . ....... ......... ..... . 4-13 4.5 Direct Vessel Injection Line Break Event Tree Model . . .. ............ . 4-13 4.5.1 Event Description . . . . . . . . . . . .... ... ....... .. . . 4-13 4.5.2 Event Tree Model and Nodes .... .... . . . ... . . . 4-14 4.5.3 Event Tree Success Paths . . . . . . . .. ..... ........... 4-15 4.5.4 Operator Actions . .. ... . ....... . ..... . . . . . . . 4-15 4.5.5 Event Tree End States . ... ..... .. . ....... . ... 4-15 4.6 Intermediate LOCA Event Tree Model ... ..,.. . .,... . . . 4-16 4.6.1 Event Description . . . . ............................ . . 4-16 4.6.2 Event Tree Model and Nodes ... . ..... . . ...... . . . . . 4-16 4.6.3 Event Tree Success Paths . . .. ... ....... ...... ... . . 4-19 4.6.4 Operator Actions . . .... ......... ........ . . . . . 4-19 4.6.5 Event Tree End States . .... ........ .... ....... . 4-19 O

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Section Title Eage 4.7 Small LOCA Event Tree Model4-20 4.7.1 Event Description . ..................... . . . . . . . . . . . . . 4 20 4.7.2 Event Tree Model and Nodes ................. .......... 4-20 4.7.3 Event Tree Success Paths . . . . . . . . . . . . . . . . . . ...... ..... 4-23 4.7.4 Operator Actions . . . ................................. 4-24 4.7.5 Event Tree End States . . . . . . . . . . . ................. . . 4-24 4.8 RCS Leak Event Tree Model . . . . . . . . . . . . . . . . . ... .............. 4-24 4.8.1 Event Description . . . . . . . . . . . . . . . . ......... .. ....... 4-24 4.8.2 Event Tree Model and Nodes ........... . .............. 4-25 4.8.3 Event Tree Success Paths . . . . . .. ..... .. .. .. . . . . . . 4-25 4.8.4 Operator Actions . . . . . . . . . . . . . . . . . . . .. ............. 4-26 4.8.5 Event Tree End States .......... ... . ...............4-26 4.9 PRHR Tube Rupture Event Tree Model . . . . . ......................4-26 4.9.1 Event Description . . . . . . ..... . ............. .... . 4-26 4.9.2 Event Tree Model and Nodes .......... ......... ...... 4-26 4.9.3 Event Tree Success Paths ..... . ..... .. ............ 4-27 4.9.4 Operator Actions ............. ... ... ..... .. .....4-27 4.9.5 Event Tree End States . .... ... ................... . 4-28 n 4.10 Steam Generator Tube Rupture Event Tree Model . . . . . . . ............ 4-28

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4.10.1 4.10.2 Event Description . . .. . .... ........................4-28 Event Tree Model and Nodes ............................4-30 i 4.10.3 Event Tree Success Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34 )

4.10.4 Operator Actions . . . . . . . .......... .................. 4-34 J

4.10.5 Event Tree End States ........... ..................... 4-35 4.11 Reactor Vessel Rupture Event Tree Model ...................... .. . 4-35 4.11.1 Event Description . . . . . . . . . . . . . . . . . . . . ... .. . . . . . . . . . 4-3 5 4.11.2 Event Tree Model and Nodes ....... ...... . . . . . . . . . . . . . 4-3 5 4.11.3 Event Tree Success Paths . . . . . . . . . ...... ........... . 4-36 4.11.4 Operator Actions . . ............ . . . . . . . . . . . . . . . . . . . 4-3 6 4.11.5 Event Tree End States . . . . . . . . . . .... . . . . . . . . . . . . . . . 4-36 4.12 Interfacing System LOCA Event Tree Model . . . . . . . .................4-36 l 4.12.1 Event Description . . . . . . . . . . . . .. ...... .......... . . 4-36 l 4.12.2 Event Tree Model and Nodes ............................4-36 4.12.3 Event Tree Success Paths . . . . . . . . . . . . . . . . . . . . . . . . .... . 4-36 l 4.12.4 Operator Actions . . . . . . . . . . . . . . . ....... ... .... . .. 4-37 l 4.12.5 Event Tree End States ........... .............. . . . . . . 4-37

4.13' Transients with MFW Event Tree Model . . . . .. ... .......... .4-37 4.13.1 Event Description . ... ......... .. ........ ... .. 4-37 4.13.2 Event Tree Model and Nodes ............. ......... . . 4-39 4.13.3 Event Tree Success Paths . . . . . . . . ............... . . . . . . 4-4 3 l 4.13.4 Operator Actions 4-43 4.13.5 Event Tree End States . ...... ..... ............ . . . 4-43 O

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Title .Pajte Section 4.14 Transients with Loss of RCS Flow Event Tree Model . . ... ........... 4-44 4.14.1 Event Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44 4.14.2 Event Tree Model and Nodes ................ ........... 4-44 4.14.3 Event Tree Success Paths . . . . .. .......... . . . . . . . . . . . . 4-47 4.14.4 Operator Actions . . . . . . . . . . . . ............. . . . . . . . . . 4-4 8 4.14.5 Event Tree End States ...... .. ....... ...... . . . . . . . . 4-4 8 4.15 Transients with Loss of MFW to One SG Event Tree Model . . . . . . . . . . . . . . 4-48 4.15.1 Event Description . . . . . . . . ............... ... . . . . . . . 4-48 4.15.2 Event Tree Model and Nodes . ....... .. ... .. . . . . . . . 4-49 4.15.3 Event Tree Success Paths . . . . . . ... ..... . . . . . . . . . . . 4-5 2 4.15.4 Operator Actions . . . . . .. .. ........ .. ........... 4-52 4.15.5 Event Tree End States ... . .. ...... ........ ...... 4-53 4.16 Transients with Core Power Excursion Event Tree Model . . . . .. ...... 4-53 4.16.1 Event Description . . . . . . . . . . . . . ............... ...... 4-53 4.16.2 Event Tree Model and Nodes . ...... ................... 4-53 4.16.3 Event Tree Success Paths .............. . ... ....... . 4-57 4.16.4 Operator Actions . . . . . . . . . . . . . . . . . . .. ..... ........,4-57 4.16.5 Event Tree End States .... ......... .... .. ......... 4-57 4.17 Transients with Loss of CCS/SWS Event Tree Model . . . . . . . . . . . . . . . . . . 4-5 8 4.17.1 Event Description . . . . . . . . . ...........................4-58 4.17.2 Event Tree Model and Nodes ........ .... . .. ........ 4-58 4.17.3 Event Tree Success Paths . .... ............... ...... 4-61 4.17.4 Operator Actions . . . . . . . . .. ................. .. . . 4-62 4.17.5 Event Tree End States .... . ...... ..... ... . .. .. 4-62 4.18 Loss of Main Feedwater Event Tree Model ............ ............ 4-62 4.18.1 Event Description . . . . . . . . ... ......... ............ 4-62 4.18.2 Event Tree Model and Nodes .... ............. . . . . . . . 4 64 4.18.3 Event Tree Success Paths .............................. 4-68 4.18.4 Operator Actions . . . . . ............... ............... 4-68 4.18.5 Event Tree End States ............... ................ 4-68 4.19 Loss of Condenser Event Tree Model . . . . . . .... ........... ...... 4-69 4.19.1 Event Description . . . . . . . .......... .... . .. ..... 4-69 4.19.2 Event Tree Model and Nodes . .... . ............ ... . 4-69 4.19.3 Event Tree Success Paths . .. . ...... ..... . . ..... 4-72 4.19.4 Operator Actions . ........ . ..... .... ... . . . . . . . . . 4-7 2 4.19.5 Event Tree End States . . . .. ....... . . . ...... 4-73 O

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Section Title P.!yte 4.20 Loss of Compressed Air Event Tree Model . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 3 4.20.1 Event Description . ...... ................. ..... . . . . 4-73 4.20.2 Event Tree Model and Nodes .. ............ .. . ... . 4-74 4.20.3 Event Tree Success Paths . . . . . . . . . . . . . . . . . . . . . . ...... 4-77 4.20.4 Operator Actions . . . . . . . . . . ................. . . . . . . 4-77 4.20.5 Event Tree End States ........... .... ...... .. .. . . 4-77 4.21 Loss of Offsite Power Event Tree Model ......................... . 4-78 i 4.21.1 Event Description . . . . . . . . .. .... . .. ..... . . . . . 4-7 8 4.21.2 Event Tree Model and Nodes ....... ...... .... . ... . . 4-78 4

4.21.3 Event Tree Success Paths .. ....... ................. 4-82 1 1

4.21.4 Operator Actions . . . . . . . . . . .. .............. .... . 4-82 l 4.21.5 Event Tree End States ............. .............. ... 4-83 4.22 Main Steam Line Break Downstream of MSIVs Event Tree Model .. . ... 4-83 4.22.1 Event Description . . . . .. .......... . . ... . .. . 4-83 4.22.2 Event Tree Model and Nodes ............ ....... . .... 4-84 4.22.3 Event Tree Success Paths . . . . . . . . . . . ..... . . . . 4-87 4.22.4 Operator Actions . . . . . . . . . . . . . ... ...... ............ 4-87 s 4.22.5 Event Tree End States .... . ....... ...... ..... ..... 4-88 4.23 Main Steam Line Break Upstream of MSIVs Event Tree Model . . . . . . ..... 4-88 v ) 4.23.1 Event Description . . . . . . . . . . ................ ......... 4-88 4.23.2 Event Tree Model and Nodes . ....................... .. 4-89 4.23.3 Event Tree Success Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-92 4.23.4 Operator Actions . ....... . ... . ... .......... . . 4-92 ,

4.23.5 Event Tree End States ............ ......... .. ....... 4-93 1 4.24 Stuck-Open Secondary-Side Safety Valve Event Tree Model .. . ....... 4-93 4.24.1 Event Description . . . ..... ..... .................... . 4-93 4.24.2 Event Tree Model and Nodes ................... ..... . . 4-94 4.24.3 Event Tree Success Paths . ............ ........... ... 4-97 4.24.4 Operator Actions . . . . . . . . . . . . . . . ................. .. 4-97 4.24.5 Event Tree End States . . ..... ............... .. .. . 4-97 4.25 ATWS Precursors without MFW Event ~ree Model . . . . . . . . ........... 4-98 4.25.1 Event Description . . . . . . . . . . . . . . . . . . . . ..... ........ . 4-98 4.25.2 Event Trev Model and Nodes ... ......... . ... . . . 4-100 4.25.3 Event Tree Success Paths . . . . . . . .. ..... ...... .. . 4-104 4.25.4 Operator Actions . . . . . . .. ...... ............. .. 4-104 4.25.5 Event Tree End States .. ... ..... .......... ...... 4-105 b

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Section Title fate 4.26 ATWS Precursor with SI Event Tree Model ..... . ..... ..... .. 4-105 l 4.26.1 Event Description . ............. .. ............... 4-105 4.26.2 Event Tree Model and Nodes ......... ...... . . . . . . . . . . 4- 106 4.26.3 Event Tree Success Paths . . . . . . . . . . . ....... .. .. . . . . 4-109 4.26.4 Operator Actions , . . . . .... ....... ... . . .... . . . 4-109 4.26.5 Event Tree End States . .......... .... .... . . . . . . 4-110 4.27 ATWS Precursor Transients with MFW Event Tree Model . . . ... . . 4-110 4.27.1 Event Description . ... . ... .. ... . . . . . . . . . 4- 1 10 4.27.2 Event Tree Model and Nodes ............ ....... . .. 4-111 4.27.3 Event Tree Success Paths . . .......... ........... . . . . 4-114 4.27.4 Operator Actions . ... . ............ .. . ......... 4-114 4.27.5 Event Tree End States . ....... . . ..... . .. 4-114 4A Event Tree Analysis Methodology . . . ........ .... ...... . . . . . 4A- 1 4A.1 Overview . . . . . . ...... ..... .. ...... . ........ . . 4A-1 4A.2 Event Tree Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 A- 1 4A.3 Event Tree Development . . . . .... . .. . .. . . . . 4A-2 4A.4 Success Criteria . . . . . . . . . . . . . . . . . . . . ........... ........... 4A-4 4 A.4.1 Time Frame ... . ... ............. . .. . .... . 4A-4 4A.5 Consequential Events . . . . .................. .. ..... . . . . 4 A-5 4A.6 Definition of Core Damage Categories . . . . ......... . . . . . . . . . . 4 A -5 CHAPTER 5 SUPPORT SYSTEMS 5.1 Introduction . ..... .. . .... . .. . ....................... 51 5.2 Support Systems and Their Interdependencies . . . . ..... .. . .. ... . 5-1 5.3 Front-Line Systems and Their Dependencies . . . . . . . . . . ...... ...... . 5-1 CHAPTER 6 SUCCESS CRITERIA ANALYSIS 6.1 Introduction . .......... .. . ........ ... .. .. ..... 6-1 6.2 Acceptance Criteria and Critical Functions for Success Criteria . . ......... 6-1 6.3 Event Sequences and Timing, Passive / Active System Interactions . .. ..... 6-3 6.3.1 General Sequence Success Criteria . . . . . . . .. ..... . ..... 6-3 6.3.2 Timing of Events and Key Operator Actions . .... ........ 6-8 6.3.3 Passive / Active System Interactions ..... . . .. . . . . . . . . 6- 17 6.3.4 Sequence Success Criteria Summary . . . . . . . . . ... .. . .. . 6-19 6.4 Event Tree Top Events Success Criteria .......... . .. ....... . 6-20 6.4.1 Accumulators ........ . . .......... .. . ....... 6-21 6.4.2 Full RCS Depressurization . . .... ........ . . ..... 6-22 6.4.3 Partial RCS Depressurization . . . . . . . . . . . .. .... ........ . 6-33 6.4.4 Location of Main Steam Line Break Upstream of MSIVs . . . . . . . 6-40 6.4.5 Large LOCA Break Size Sufficient for IRWST Injection with Failed Containment Isolation . . .. .......... ... ... 6-41 e

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Section Title Page 6.4.6 Main Steam Line Isolation Following Steam Line Break . . . . . . . . . 6-41 6.4.7 Steam Generator Isolation Following SGTR ... .......... . . 6-43 6.4.8 Containment Isolation for Large LOCA .. ........... . . . . 6-44 6.4.9 Core Makeup Tank System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 5 6.4.10 Turbine Bypass and Main Condenser Available - SGTR . . ... . 6-50 6.4.11 Auxiliary Pressurizer Spray . . . . . .. ......... ... . . . . . 6-51 6.4.12 RCS Boration Following ATWS . . . . . . . . . . . . ... ... . . . 6-52 6.4.13 RCS Makeup From the Chemical and Volume Control System . . . . . 6-53 6.4.14 Inventory and Reactivity Control Following Steam Line Break . . . . . 6-5 5 6.4.15 Diverse Actuation System Operation for ATWS . . ... . . . . . 6-5 6 6.4.16 Emergency Diesel Generators Operate . . .... . . . . . . . . . . 6-5 8 6.4.17 Main Feedwater Available . . . . . . . . . ... ... ... . .... . 6-59 6.4.18 Gravity Injection . . . . . . . . . . . .... ...... .. ....... 6-62 6.4.19 Motor Generator Sets Tripped . . . . . ...... ............... 6-67 6.4.20 RCS Pressure Relief Via Pressurizer Safety Valves . . . . .. .. . . 6-68 6.4.21 Patsive Residual Heat Removal System Isolation Following PRHR Tube Rupture ...... . ..................... . . 6-69 6.4.22 Passive Residual Heat Removal System Operatica . . . . . . . . . . . . . 6-70 l] 6.4.23 Pressurizer Safety Valves Reclose . .......... . . . . . . . . . . . . 6-74 v 6.4.24 Offsite Power Recovered Within One-half Hour . . . . . . . . . . . . . . . 6-75 6.4.25 Reactor Coolant Pumps Trip . ......... ...... . . . . . . . . . 6-7 6 6.4.26 Water Recirculation to the RCS . . .. ........... . . . . . . . . . 6-7 8 6.4.27 Normal 14esidual Heat Removal System . . ............ . . . . . 6-80 6.4.28 Reactor Trip . . . . . . . . . . . . . .... ... ... . ........ 6-84 6.4.29 Manually Step-In Control Rods Following ATWS .. ... ...... 6-87 6.4.30 Manual Controlled Shutdown .. .......... .... . . . . . . . . 6-8 8 6.4.31 Startup Feedwater System ............... . . . . . . . . . . . . 6- 8 8 6.4.32 Steam Generator Overfilling Protection . . . . . . . .... ......... 6-93 6.4.33 Steamline Break-Induced Steam Generator Tube Rupture ... . . . . 6-94 6.4.34 Reclosure of the Main Steamline Relief Valves . ........ ... . 6-95 6.5 ATWS Modeling Considerations . . ............... ....... . . . . 6-98

6.5.1 Background . .. .. ......... .. ... . ..... . . 6-98 6.5.2 Success Criteria for Shutdown . . . . . . . . . . . . . . . . . . . 6-98 6.5.3 Success Criteria to Achieve Zero UET . . . ... . . .. . . . . . 6-99 6.5.4 Success Criteria Credit for Reactor Coolant Pump Trip ... ... . 6-100 6.6 References .....................................6-101 CHAPTER 7 FAULT TREE GUIDELINES 7.1 Purpose .......... ...... .. ... . ... ... ........ ..... 7-1 7.2 Fault Tree Development . . . . . . . . .... ......... ... .. . ... 7-1 7.2.1 Procedural Steps for Fault Tree Preparation . . . .. ......... 7-1 7.2.2 Procedural Steps for Fault Tree Construction . . . .. .... ..... 7-2 O

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Section Title Page 7.3 Primary Events to be Considered in Fault Trees . . .................... 7-3 7.3.1 Random Component Failure ........................ .. . 7-4 7.3.2 Outage for Maintenance and Testing ................ ...... 7-6 7.3.3 Common Cause Failures . . . . . . . . . . . . . . . . . . . . ....... .. 7-7 7.3.4 Human Errors . . . . . ............. ..... .............. 7-7 7.3.5 Power and Control Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10 7.4 Data Base . ..... . . ......... ................... ......... 7-11 7.5 Fault Tree Model: Identification Codes .... ............ ........ 7-11 7.5.1 Identification Code for Fault Tree Names ... ............... 7-11 7.5.2 Identification Code for Support Systems . . . .. . . . . . . . . . . . . 7- 12 7.5.3 Identification Code for Primary Event Names ... ...... ... . . 7-12 7.5.4 Identification Code for Common Cause Failures . .. . . . . . . . . . . 7- 12 7.5.5 Identification Code for Undeveloped Events (Modules) .... ..... 7-13 7.5.6 Identification Code for Operator Errors . .. ................7-14 7.6 Fault Tree Quantification .... ........ . .... .................7-14 7.7 References ...... ........ ... .. ... ....... ............ 7-15 P SS IDU T VkL 8.1 System Description ...... ..... ................ . .......... 8-1 8.1.1 Support Systems . . . . . . . . . . . . . . . . . . ................. . 8-1 8.1.2 Instmmentation and Control .. ........ ...... ........... 8-1 8.1.3 Test and Maintenance Assumptions ....... ................ 8-2 8.2 System Operation . . . ...................... ... ............. 8-2 8.3 Pe:formance during Accident Conditions . . . . .......... ............. 8-3 ,

8.3.1 Non-Loss-of-Coolant Accident Transients . . . . . . . ..... ..... 8-3 8.3.2 Loss-of-Coolant Accidents . . . . . . . . . . . . . . . . .... ... ...... 8-3 8.3.3 Passive Residual Heat Removal Heat Exchanger Tube Rupture ...... 8-4 8.4 Initiating Event Review ............................... ....... 8-4 8.4.1 Initiating Events Impacting the Passive Residual Heat Removal System . . . .... .. ........... .... ........ . ... 8-4 8.4.2 Initiating Events Due to Loss of the Passive Residual Heat Removal System ...... .. . ........... .. .. . ............ 8-5 8.5 System Logic Models . . . . . ......... ..... . ... ......... . 8-5 8.5.1 Assumptions and Boundary Conditions ... .. ......... ..... 8-5 8.5.2 Fault Tree Models . . . . ..... ...... . ............. 8-6 l 8.5.3 Human Intertetions ................. . .............. 8-7 ,

8.5.4 Common Cause Failures . . . . . . . . . . . . .... ... ......... 8-7 l 8.6 References . . . . . . . . . . . . ........ .......... . ..... . .... 8-7 Revision: 9 9

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Section Title P, age CHAPTER 9 PASSIVE CORE COOLING SYSTEM - CORE MAKEUP TANK 9.1 System Description ............................ .. ........... 9-1 9.1.1 S upport Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... ... 9-1 9.1.2 Instrumentation and Control . . . . . . . . . . . . . . . . . . . . . . . ...... 9-1 9.1.3 Test and Maintenance Assumptions .. ...................... 9-2 9.2 System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . ............. ... 9-2 9.3 Performance during Accident Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3 9.3.1 'nadvertent Opening of a Steam Generator Relief or Safety Valve

. . . 9-3 9.3.2 Steam Line Break . . . . . . . . . . . . . .................... .. 9-3 9.3.3 Steam Generator Tube Rupture . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3 9.3.4 Reactor Coolant System Heatup Transients . . . . . . . . . . . . . . . . . .. 9-4 9.3.5 Loss-of-Coolant Accidents . . ........... ............. .. 9-4 9.3.6 Loss of 0ffsite Power . . . . . . . . . . . . .......... ........... 9-4 9.3.7 Anticipated Transient without Trip . . . . . . . . . . . . . ... ........ 9-4 9.4 Initiating Event Review ........................................ 9-5 9.4.1 Initiating Events Impacting the Core Makeup Tank Subsystem . . . . . . 9-5 9.4.2 Initiating Events Due to Loss of the Core Makeup Tank Subsystem . . . 9-5 9.5 System Logic Models . . . . . . . ... ... .......................... 9-5 (g)v 9.5.1 Assumptions and Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . 9-5 9.5.2 Fault Tree Models . ................................... 9-7 9.5.3 Human Interactions .. ................................. 9-8 9.5.4 ( 'nmon Cause Failures . . . . . . . . . . . . . . .................. 9-8 9.6 References ................................................ 9-8 CHAPTER 10 PASSIVE CORE COOLING SYSTEM - ACCUMULATOR 10.1 System Description .................................. . . . . . . 10-1 10.1.1 Support Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10- 1 10.1.2 Instrumentation and Control . ........... . . . . . . . . . . . . . . . 10- 1 10.1.3 Test and Maintenance Assumptions ....................... . 10-1 10.2 System Operation . . . . . . . . . . . . . . ........... ..... . . . . . . . . . . . 10-2 10.3 Performance during Accident Conditions . . ....... . . . . . . . . . . . . . . . . 10-2 10.3.1 Steam Line Break ...... ................... ........ . 10-2 10.3.2 Loss-of-Coolant Accidents or Non-Loss-of-Coolant Accidents with Automatic Depressurization System . . . . . . . ...... . . . . 10-2 10.4 Initiating Event Review ............ ............. . . . . . . . . . . . . 10-3 10.4.1 Initiating Events Impacting the Accumulator Subsystem . . . . . . . . . . 10-3 10.4.2 Initiating Events Due to Loss of the Accumulator Subsystem . . . . . . . 10-3 r

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e Section Title hge 10.5 System Logic Models . . . . . ....... ....................... . . . 10-3 10.5.1 Assumptions and Boundary Conditions . . . . . . . . . . . . . . . . . ... . 10-3 10.5.2 Fault Tree Models . . . . . . . . ....... .............. . 10-4 10.5.3 Human Interactions .... . ... ................ . . . . . . 10-5 10.5.4 Common Cause Failures . ............................. . 10-5 10.6 References ...... ............. ......... ............. .. . 10-5 CHAPTER 11 PASSIVE CORE COOLING SYSTEM - AUTOMATIC DEPRESSURIZATION SYSTEM 11.1 System Description .................... ................. ... 11-1 11.1.1 Suppost Systems . . . . . . . . . .. .. ................. .. 11-1 11.1.2 Instrumentation and Control .......... ..... ... .. . . 11-2 11.1.3 Test and Maintenance . . . . .... .............. ..... ... 11-3 11.2 System Operation . . . . . . ......... .................. .... . 11-3 11.3 Perfonnance during Accident Conditions . . . . . . . . . . . . . . . ....... .... 11-3 11.3.1 Loss-of-Coolant Accidents . . . . . . . . . . . . .... . .. ..... . 11-3 11.3.2 Tran sients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 11-4 11.4 Initiating Event Review ........... .. ...... ...... ....... . 11-4 11.4.1 Initiating Events Impacting the Automatic Depressurization System . . 11-4 11.4.2 Initiating Events Due to Loss of the Automatic Depressurization System . . ... .. ........... .. ................... 11-4 11.5 System Logic Models . . . . . . ......... ... .................... 11-4 11.5.1 Assumptions and Boundary Conditions . .............. .... 11-4 11.5.2 Fault Tree Models . ......... ....... ..... .......... 11-5 11.5.3 Human Interactions ......... .... ................... 11-7 11.5.4 Common Cause Failures . . .. ....................... 11-8 11.6 References ................... ..... . ..... ...... . . . . 11-8 CHAPTER 12 PASSIVE CORE COOLING SYSTEM - IN-CONTAINMENT REFUELING WATER STORAGE TANK 12.1 System Description .. ... . ........ ..... .... . . . . . . . . . . . 12- 1 12.1.1 Support Systems . . . . . . . . . . . ...... .... ..... ...... 12-1 12.1.2 Instrumentation and Control ....... .. .... ... . ... 12 1 l 12.1.3 Test and Maintenance Assumptions . . . . . . . . . . . . .... .. . 12-2 12.2- System Operation . . . . ...... .... ... ... ..... ... ... . . . 12 2 12.3 Performance during Accident Conditions . . ........... ..... .. 12-2 12.3.1 Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. .. 12-4 12.3.2 Loss-of-Coolant Accidents .. . ........ . . . . . . . . . . . . . . . 1 2 -4

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Section Title _P,. age 12.4 Initiating Event Review ......... ...... ....... .... . . . . . . . 12-5 12.4.1 Initiating Events Impacting the IRWST Subsystem . . ...... .... 12-5 12.4.2 Initiating Events Due to Loss of the IRWST Subsystem . . ...... . 12-6 12.5 System Logic Models ........... .... ....... .... ......... 12-6 l 12.5.1 Assumptions and Boundary Conditions . ... . .. . .... 12-6 l

12.5.2 Fault Tree Medels . . .. . .... ..................... . 12-8 l 12.5.3 Human Interactions ....... ......... . ... .. ...... . 12-9 12.5.4 Common Cause Failures . . . .. ........... ..... .... . 12-10 12.6 References . . . . . . . . .......... ................ ........ 12-10 CHAPTER 13 PASSIVE CONTAINMENT COOLIM SYSTEM 13.1 System Description . ........... . ... .... . . . . . . . . . . . . 13- 1 13.1.1 Support Systems ........ .. .. ... .. .. ... ..... . 13-1 13.1.2 Instrumentation and Control . . .. ........ .. . . . . . 13-1 13.1.3 Test and Maintenance Assumptions .... ....... .......... 13-2 13.2 System Operation . . . . ....... ........ ...... ....... .. .. 13-2 13.3 Performance during Accident Conditions . . . . . . . ... .. . .......... 13-2 13.3.1 Post-Reactor Trip with Loss of All ac Power . . . . . . . . . . . . . . . . . . 13-2 (n) 13.3.2 13.3.3 Automatic Depressurization System (ADS) Actuation . . . . . . . . . . . . 13-2 Post-Loss-of-Coolant Accident . . ........ ... ..... ... . 13-3 13.3.4 Post-Main Steam Line Break . . . . . . . . .................... 13-3 13.4 Initiating Event Review ..................... . . . . . . . . . . . . . . 13-3 13.4.1 Initiating Events Impacting the Passive Containment Cooling System . . . . . . . . . . . . . . . . .... ...... . . . . . . . . 13-3 13.4.2 Ir.itiating Events Due to Loss of the Passive Containment Cooling System . . . . ........ .. ....... . . . . . . . . . . . 13 -4 13.5 System Logic Model . ....... ...... ..... .... . .. .. . . . 13-4 13.5.1 Assumptions and Boundary Conditions . . . .............. 13-4 13.5.2 Fault Tree Model . . . . . . . .. .... ......... ..... ..... 13-6 13.5.3 Human Interactions ..... .. .. ........ ............ 13-6 13.5.4 Common Cause Failures . . .... . .... ..... .. . . . . . . 13-6 )

13.6 References . . ..... ...... ......... ....... .. .. . . . . . . . 13-7 )

CHAPTER 14 MAIN AND STARTUP FEEDWATER SYSTEM i 14.1- System Description . .. ... .. .. . .... ..... . ..... ... 14-1 14.1.1 Support Systems ..... .... ............. . .. . . . . . . 14-1 14.1.2 Instrumentation and Control .... .. ....... . . .. ..... 14-1 14.1.3 Test and Maintenance Assumptions . . . . . . . . . ........ ..... 14-2 l (D

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0 Section Title f.aye 14.2 System Operation .................... ...... ............... 14-2 14.3 Performance during Accident Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-2 14.4 Initiating Event Review .... ............................. ... . 14-4 14.4.1 Initiating Events Impacting the Main and Startup Feedwater and Condensate Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-4 14.4.2 Initiating Events Due to Loss of the Main and Startup Feedwater and Condensate Systems . . . . ................... 14-5 14.5 System Logic Models . . . ........................ ....... . . . . 14-5 14.5.1 Assumptions and Boundary Conditions . . . . . . . ... ...... . 14-5 14.5.2 Fault Tree Models . . . . ............. .... .. . . . . . . 14-7 14.5.3 Human Interactions . ............... . .............. 14-8 14.5.4 Common Cause Failures . . . . . .. ......... ....... .... 14-8 14.6 References .. ........... . ..... ...... . ....... ..... 14-8 CHAPTER 15 CHEMICAL AND VOLUME CONTROL SYSTEM 15.1 System Description ..... .. ... .......... . ......... .. . 15-1 15.1.1 Support Systems . . . ........ ................... .. 15-1 15.1.2 Instrumentation and Control Assumptions . . ............ . . . . 15-1 15.1.3 Test and Maintenance Assumptions ......... .. ....... . . 15-2 15.2 System Operation ......... .. ................ ...... . . . . . 15-3 15.3 Performance during Accident Conditions . . . . .. . .... . .... 15-3 l 15.4 Initiating Event Review ... .......... ....... ... ... . . . . . . . . 15-5 15.4.1 Initiating Events Impacting the Chemical and Volume Control System .15-5 15.4.2 Initiating Events Due to Loss of the Chemical and Volume Contro1 System . . . . . . . . . . . . . ... .. ........ .. . . . 15-5 i 15.5 System Logic Models . . . . . . . . . ....... . .. .... ...... ...... 15-5 15.5.1 Assumptions and Boundary Conditions . . . . ........... ..... 15-5 l 15.5.2 Fault Tree Models . . . . . . . . . . . . . . . . . . . . . . . . ..... . . . 15-7 i 15.5.3 Human Interactions ...................... .. . ... 15-8 1 15.5.4 Common Cause Failures . . ..... .. .. . .. ......... 15-8 l 15.6 References . . . . . . . . . . . . .................... . ...... . . . . 15-8 i

CHAPTER 16 CONTAINMENT HYDROGEN CONTROL SYSTEM l 16.1 System Description .. .... ..... .. .... .. .. . . 16-1 l 16.1.1 Support Systems . . . ... .............. ............ 16-1 16.1.2 Instrumentation and Control .. . ..... . . .. . . . . . . 16-1 l 16.1.3 Test and Maintenance . . ............ .. ...... . . . . . 16-2 l 1

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Section Title Page 16.2 System Operation . . . . . . . . . . . . . . . . . . ..... ..... . . . . . . . . . . . . 16-2 16.3 Performance during Accident Conditions . ........... ......... . . . . 16-2 16.4 Initiating Event Review ...... ....... ... ... . .... . . . . . 16-2 16.5 System Logic Model . . . . . . . . . . . . . . . . . ........ ..... . . . . . . 16-2 16.5.1 Assumptions and Boundary Conditions . ................ . . . 16-3 16.5.2 Fault Tree Model . . . ..... .. . . . . . . . . . . . . . . . . . . . . . . 1 6-3 16.5.3 Human Interactions ....... ... ... .... . . . . . . . . . . . . 16-4 16.6.4 Common Cause Failures . . . . . . . . . . . . . .. . ....... . . 16-4 16.6 References .........................................16-4 CHAPTER 17 NORMAL RESIDUAL HEAT REMOVAL SYSTEM 17.1 System Description ... .. .. ........ ..... . .. ..... . . 17-1 17.1.1 Support Systems . . . . . . . .... . .. . .. . . 17-1 17.1.2 Instrumentation and Control ... .. ... ............. .... 17-1 17.1.3 Test and Maintenance Assumptions . . . . . . . ... . . . . . . 17-1 17.2 System Operation . . . . . . . . . . . . . . . . .. .. .... ..... .... .. 17-2 17.3 Performance during Accident Conditions . .. . ..... . ... .. .... 17-2 c 17.4 Initiating Event Review . ......... . .. ... ...... ... ...... . 17-3 3

( 17.4.1 Initiating Events Impacting the Normal Residual Heat {

b Removal System . . . . . .... .... . .............. 17-3 17.4.2 Initiating Events Due to Loss of the Noanal Residual Heat Removal System . . . . . . ......... ...... . .... . 17-4 17.5 System Logic Models . . . . ..... .. ..... .............. ... 17-4 17.5.1 Assumptions and Boundary Conditions .. ......... .... . . 17-4 17.5.2 Fault Tree Models . . . . . . . . . . . ........... ...... .. 17-6 17.5.3 Human Interactions ...... . ..... .... . . . . . . . . . . . . . . . 1 7-7 17.5.4 Common Cause Failures . . . . . . . ... .................... 17-7 17.6 References ....... .. ........... ... ................. . 17-7 CHAPTER 18 COMPONENT COOLING WATER SYSTEM 18.1 System Description ................ .........................18-1 18.1.1 Support Systems .......... ......... . ..... . . . . . 18- 1 18.1.2 Instrumentation and Control ... .......... .. .. .. . . . . I 8-1 18.1.3 Test and Maintenance Assumptions . .. ...... ...... . . . 18-1 18.2 System Operation . . . . . . . . . . . . . . . . . . ................... ...... 18-2 18.3 Performance during Accident Conditions . . . . ...... .. . . . . . . . . . . 18-2 18.4 Initiating Event Review .... ........ . . .............. ... . 18-2 18.4.1 Initiating Events Impacting the Component Cooling Water System . . . 18-3 18.4.2 Initiating Events Due to Loss of the Component Cooling Water System . . . . . . . ........ ....... .. ......... . . . 18-3

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e Title f, age Section 18.5 System Logic Models . . . . . . . . . . . . . . . . . . . ...... . . . . . . . . . . . . . 18-3 18.5.1 Assumptions and Boundary Conditions . . . . . ......... . . . . . 18-3 18.5.2 Fault Tree Models . . . . . . . . .......... . . . . . . . . . . . . . . . 1 8-4 18.5.3 Human Interactions ... . .. ............ ....... ... . 18-5 18.5.4 Common Cause Failures . . . . .... ............... . . . . . 18-5 18.6 References .................... ..................... ..... 18-5 CHAPTER 19 SERVICE WATER SYSTEM 19.1 System Description ........... . ........... ................ 19-1 19.1.1 Support Systems . . . .... .. ....... ..... . . . . . . 19-1 19.1.2 Instrumentation and Control .................. ........ . 19-1 19.1.3 Test and Maintenance Assumptions ...... ... . .. ... . . 19-1 19.2 System Operation . . . . . . . . ... ...... .... ......... .. .. . 19-2 19.3 Performance during Accident Conditions . . . . . . . . . . .. ..... ... . 19-2 19.4 Initiating Event Review ....... ....... .... . . ..... ... . 19-2 19.4.1 Initiating Events Impacting the Service Water System . . . . . . . . . . 19-3 19.4.2 Initiating Events Due to Loss of the Service Water System . . . . . . . 19-3 19.5 System Logic Models . . . . . . ....... ........ . . . ...... 19-3 19.5.1 Assumptions and Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . 19-3 19.5.2 Fault Tree Models . . . . . . . .. .......... .. ...... .. 19-5 19.5.3 Human Interactions .. ....... .......... ...... . . . 19-5 19.5.4 Common Cause Failures . .. .... .... . ....... . . . . . 19-5 19.6 References . . . . . . . . . . . . . . . . ... .............. .......... . 19-5 CHAPTER 20 CENTRAL CHILLED WATER SYSTEM 20.1 System Description ....... ...... ... ...... ....... ... . . 20-1 20.1.1 Support Systems . .. ........ .. ... .. ....... . . 20-1 20.1.2 Instrumentation and Control .... ....... ... . . . . . . . . . . . 20- 1 20.1.3 Test and Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . 20-1 20.2 System Operation . . . . . . . . ............. . ... ... ........ 20-2 20.3 Performance during Accident Conditions . . . . . . . . . . . . . . . . .. . .. .. 20-2 20.4 Initiating Event Review ... .......... .. ..... . .... ...... 20-2 20.4.1 Initiring Evem Im: acting the Central Chilled Water System . . . . . . 20-3 20.4.2 Initinting Events Due to Loss of the Central CC.ed Water Syst m . . ..... .. ............... . .... .. .... 20-3 20.5 System Logic Model ..... ............ ...... . . . . . . . . . . . . . . 20-3 20.5.1 Assur iptions and Boundary Conditions . . . . . . . ... . . . . . 20-3 20.5.2 Fault Tree Mcdel . .. .......... . . . . . . . . . . . . . . . . . . . . . 2 0-4 20.5.3 Humn Interactions . .......... ... ... ......... . . 20-4 20.5.4 Common Cause Failures . . . ...... . ... ....... ... 20-4 p ,1997 - WB5tiligt100SB o$ap6005pra\rev_9% pre-tocMlb xvi

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Section Title Eage 20.6 References .......... ...... .............. ....... . . . . . . 20-5 CHAPTER 21 AC POWER SYSTEM 21.1 System Description ........... . . ...... .... .... . . 21-1 21.1.1 Support Systems ........... .............. .. ....... 21-2 21.1.2 Instrumentation and Control . ..... ......... ....... 21-2 21.1.3 Test and Maintenance Assumptions . . . . . . . . . . .. ..... . 21-2 21.2 System Operation .. .. . ... ...... ............. ... ...... 21-2 21.3 Performance during Accident Conditions . . ......... . .. . .... ... 21-3 21.3.1 Automatic Load Shedding .... . ... .... .. ...... .. 21-3 21.3.2 Manual Transfer . . . .... . ...... . ... ........ . 21-3 21.3.3 Electric Circuit Protection .......... ... . ... . 21-3 21.4 Initiating Event Review ... .......... ..... . ... .... .. 21-4 21.4.1 Loss of the Main Generator . . ........... .... ... ... 21-4 21.4.2 Loss of Offsite Power . ..... .. ... . .... .. ... 21-4 21.4.3 Loss of 4160-vae and 480-vac Busses . . . .. ..... ........ 21-5 21.5 System Logic Models . . . .... . .. .... ..... ... .. ..... . 21-5 21.5.1 Assumptions and Boundary Conditions . . . .. . . . . . . . . . 21 5

( 21.5.2 Fault Tree Models . . . ... . ....... .... .. ........ 21-8

\ 21.5.3 Human Interactions ... .. .. .......... ... .. ..... . 21-8 21.5.4 Common Cause Failures . . . ...... ..................... 21-9 21.6 References .. ...... . ... .. ... . . . 21-9 CHAPTER 22 CLASS 1E DC AND UNINTERRUPTIBLE POWER SUPPLY SYSTEM 22.1 System Description ......... . . .. .. ....... . . ....... 22-1 22.1.1 Support Systems ........ ... ... .......... . . . . 22-1 22.1.2 Instrumentation and Control ........ . ... .... ... .... 22-1 22.1.3 Test and Maintenance Assumptions . . . ..... .. . .... . 22-2 22.2 System Operation . . . . . . . . . . . . . . ... ............. . .. ... .. 22-2 22.3 Performance during Accident Conditions . .. .. .. . .. . ... 22-2 22.4 Initiating Event Review .. ................ ...... .... .... . 22-3 22.4.1 Initiating Events Impacting the Class IE de and UPS System .. ... 22-3 22.4.2 Initiating Events Due to Loss of the Class 1E de and UPS System . . 22-3 22.5 System Logic Models . . . . . . . . . . . . . . . . . . . . . . ...... ........ . . 22-3 22.5.1 Assumptions and Boundary Conditions . . . . . . . . ....... . 22-3 22.5.2 Fault Tree Models .... ........ ...... .... .. . . . 22-4 22.5.3 Human 1 interactions . . ... ............ . ........ ... 22-5 22.5.4 Common Cause Failures . . . . ... .... . .. . 22-5 22.6 References . . . .......... .... ................ ...... 22-5 i

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O Section Title Page CHAPTER 23 NON-CLASS lE DC AND UPS SYSTEM 23.1 System Description .... . .......... ............. ...... ... 23-1 23.1.1 Support Systems . . . . . . . . . . . . . . . . . . ...... .......... 23-1 23.1.2 Instrumentation and Control ..................... . . . . . . 23-1 23.1.3 Test and Maintenance Assumptions . . . . ............. . . . . . 23-1 23.2 System Operation . . . . . . . . . . ....... .............. .......... 23-2 23.3 Performance during Accident Conditions . . . . . . . . . . . . . . . . . . . . . . . . ... 23-2 23.4 Initiating Event Review ..................... . ............ . 23-2 23.4.1 Initiating Events Impacting the Non-Class IE de and UPS System ..... .. ........ . . ... .. ........... . 23-3 23.4.2 Initiating Events Due to Loss of the Non-Class IE de and UPS System . . ................ . . .... ...... 23-3 23.5 System Logic Models . .. .. .. ..... ... . ... ......... . 23-3 23.5.1 Assumptions and Boundary Conditions . . . . . . . . . . . . . . . ..... 23-3 23.5.2 Fault Tree Models . ....... .. ..... . . . . ... .. 23-5 23.5.3 Human Interactions . ... .. ... . . . ..... ... 23-5 23.5.4 Common Cause Failures . . . . . . . . . ..... . . . . . . . . . . . . . . 23-5 23.6 References . . . ................. ......... ............... 23-5 CHAPTER 24 CONTAINMENT ISOLATION 24.1 System Description . ....... ...... ............... ...... 24-1 24.1.1 Support Systems . . . . . . . . . . . .. .......... ... ... .. 24-1 24.1.2 Instrumentation and Control ......... ..... ... . .... 24-1 24.1.3 Test and Maintenance Assumptions . ......................24-1 24.2 System Operation . . . ............ ....... . .......... ... .. 24-2 24.3 Performance during Accident Conditions . . . ..... ............. .... 24-2 24.4 Initiating Even; Review . ................. ... ..... ......... 24-2 24.4.1 Initiating Events Impacting Containment Isolation ....... ..... 24-2 24.4.2 Initiating Events Due to Loss of Containment Isolation System . . . . . 24-2 24.5 System Logie Models . .............. ......... . .... .... 24-3 24.5.1 Assumptions and Boundary Conditions . . . . . . .... . ...... . 24-4 24.5.2 Fault Tree Models . . . ..... . .......... .... ...... 24-5 24.5.3 Human Interactions . . ... ......... ................. 24-6 24.5.4 Common Cause Failures . . ............. .... .... .... 24-6 24.6 References . ....... . .......... . ... ... . . ....... . 24-6 O

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Section Title Eage CHAPTER 25 COMPRESSED AND INSTRUMENT AIR SYSTEM 25.1 System Description . ........ . .. .... .. . . .. . ... 25-1 25.1.1 Support Systems ..... ... . .... ... . .. . . 25-2 25.1.2 Instrumentation and Control . .. ......... ... . ..... 25-2 25.1.3 Test and Maintenance Assumptions . . . . . . . . . . . . . . . .. . .. 25-3 25.2 System Operation . . . . . . . . . . . . . . . ... .... . ..... .. . 25-3 25.3 Performance during Accident Conditions . . .. . . . .. 25-3 25.4 Initiating Event Review ....... .. ...... .. . ...... . ... . 25-4 25.4.1 Initiating Events Impacting the Instmment Air Subsystem ....... 25-4 25.4.2 Initiating Events Due to Loss of the Instrument Air Subsystem . . . . 25-4 25.5 System Logic Models . . . . . . . . ... . . . ... .... . . . . . 25-5 25.5.1 Assumptions and Boundary Conditions . . . . . .. .... . . 25-5 25.5.2 Fault Tree Models . . .. . ...... ...... . . . 25-6 25.5.3 liuman Interactions ..... . . . ...... ... ... ... . 25-7 25.5.4 Common Cause Failures . . .... ... . . ...... 25-8 25.6 References ...... . . ...... ........... . .. .. .. .... 25-8 t

O d CHAPTER 26 PROTECTION AND SAFETY MONITORING SYSTEM 26.1 System Analysis Description . . . . . . ......... . .... . . 26-1 1 26.1.1 Analysis of Support Systems . . . . . ...... . . . . . . . 26-4 26.1.2 Analysis of Instrumentation . . . . . . . .... . .. . .... . 26-6 26.1.3 Test and Maintenance Assumptions . . . . . . ....... . . ... 26-6 1 26.2 Performance during Accident Conditions . . . . . . . . .. ... .. . 26-7 26.3 Initiating Event Review ......... . . .. . .. . . . . . 26-8 26.3.1 Initiating Event Impacting PMS . . . .. ... . ... . . . . . 26-8 1 26.3.2 Initiating Event due to Loss of PMS . . . . . . . . ...... . . . . . 26-8 26.4 System Logic Model Development . .. ............. .. . . . . . 26-9 l 26.4.1 Assumptions and Boundary Conditions . . . . .. .. . . . . . 26-9 26.4.2 Fault Tree Models . . . . ................ . .. ... . . . . 26-13 l 26.4.3 Description of 1&C Subtree Development ........... . . . . 26- 13 26.4.4 Human Interactions .. ... . .......... . ..... . . . . 26-21 i

1 26.5 Discussion of Methodology . . ....... .................. ... . 26-21 l l l 26.5.1 Fault Tree Analysis ..... .................... .. . . . 26-21  ;

l 26.5.2 Unavailability . . . . . . . . ....... ............. ... . . 26-22 26.5.3 Spurious Failure Rate Per Year ... ...... .. . . . ... 26-22 26.5.4 Common Cause Failures . . ... ..... ..... ..... . . 26-24 ,

i 26.5.5 Data Manipulation . . . . . ... ............... .. . . 26-24 l l 26.6- References . .... .. .. . ... ...... ... . . . . . . 26-26 l

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Section Ili!! ERES CHAPIER 27 DIVERSE ACTUATION SYS'IEM 27.1 System Analysis Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-1 27.1.1 Support Systems Analysis . . . . . . . . . . . ........... ..... 27-1 27.1.2 Analysis of Instrumentation and Control . . . . . ......... .... . 27-2 27.1.3 Test and Maintenance . . . . . . ....................... . 27-2 27.2 Analysis of System Operation . . . . . . . . . . ...................... . 27-2 27.3 Performance during Accident Conditions ...........,........... ... 27-6 27.4 Initiating .svent Review ..................... ........... . .. 27-7 27.4.1 Initiating Events impacting the Diverse Actuation System . . . . . . . . . 27-7 27.4.2 Initiating Events Due to the Loss of the Diverse Actuation System . . 27-7 27.5 System Logic Model . . . . . . . . . . . . . . . . . . ................ .. . 27-7 27.5.1 Assumptions and Boundary Conditions . . . . . . . . . . . . . .... . 27-7 27.5.2 Fault Tree Model . . . . . . ........ ................ . . 27-8 27.5.3 Human Interactions ................. ............. ... 27-8 27.5.4 Common Cause Failums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-8 27.6 References . . . . . . . . . . . . . . . . . . ....... ... ............... . 27 8 CHAPTER 28 PLANT CONTROL SYSTEM 28.1 System Analysis Description . . . . . . . . . . . . . . . . . . . . . . . .......... . 28 1 28.1.1 Analysis of Support Systems . . . . . . . ................... . 28-3 28.1.2 Analysis of Instrumentation . . . . . . . .................. . . . 28-4 28.1.3 Test and Maintenance Assumptions . . .. .................. 28-5 28.2 Performance during Accident Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-6 28.3 Initiating Event Review . ..................................... 28-6 28.3.1 Initiaing Events Impacting the Plant Control System . . . . . . . . . . 28-6 28.3.2 Initiating Event due to Loss of Plant Control System . . . . . . . . . . 28-7 28.4 System Logic Model Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-7 28.4.1 Assumptions and Boundary Conditions . . . . . . . . . . . . . . . . . . . . 28-7 28.4.2 Fault Tree Models . . . . . . . . . . . . . . . . ............... . 28-10 28.4.3 Description of I&C Subtree Development . . . . . . . . ..... .... 28-11 28.4.4 Human Interactions ..... . ......................... . 28-18 28.5 Discussion of Methodology . . . . . . . . . . . . . . . . . . . . ....... . . .. . 28-19 28.5.1 Fault Tree Analysis . . .. .......................... . 28-19 28.5.2 Unavailability ....... .. .... .............. .... 28-19 28.5.3 Common Cause Failures . . . . . ... .. ........ .... . . 28-19 28.5.4 Data Manipulation . . . . . . ..... ........ .... . . 28 20 28.6 References .. .. .. ......... ......... . ....... . . . . 28-21 O

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Section Title Page CHAPTER 29 COMMON CAUSE ANALYSIS 29.1 Introduction .... .................. ............... ... . . . 29-1 29.2 Dependent Failures . . . ........ .................... ..... . 29-1 29.3 Common Cause Analysis . . . . . . . . . . . . . . . . . . . ... .. . . . . . . . . . . . 29-4 29.3.1 A ssumptions . . . . . . . . . . . . . . . . . . . . . ... ........ . . 29-4 29.3.2 Analysis of Potential Common Cause Failures within the System . . . . 29-5 29.3.3 Analysis of Potential Common Cause Failures among Several Systems . 29-6 29.4 Calculations for Component Groups . .............................29-6 29.4.1 Class 1E DC Batteries ........ . .......... ........... 29-6 29.4.2 Non-Class IE DC Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-7 29.4.3 Air-Operated Valves on the Core Makeup Tanks . . . . .......... 29-8 29.4.4 Automatic Depressurization System Motor-Operated Valves . . . . . . . 29-9 29.4.5 Automatic Depressurization System Squib Valves . ......... . 29-11 29.4.6 Common Cause Failure for IRWST Valves . . . . .... .. . . . . . 29-11 29.5 Results . . . . . . . . . . . . . . . . . . . . . . ..... .......... ......... . 29-15 29.6 References ....... ....... ... ... ........... ...... .. 29-15 p CHAPTER 30 HbW RELIABILITY ANALYSIS t i 30.1 Introduction ............ .... ...... .. ....... ... .. . 30-1

'/ 30.2 Summary of Results . . . . . ................. ... .......... . . . 30-1 30.3 Methodology . . . . . . . . . . . . . . . . . ......... ...... . . . . . . . . . . . . 3 0-2 30.4 Major Assumptions ........ ....... ... . .... .. . . . . . . . . . 3 0-4 30.5 Types of Human Interactions . . . . . . . . ...................... . . 30-10 30.5.1 Quantification Model . . . . ..... . .. .. . . . . . . . . . . . . . 30- 1 1  ;

30.6 Quantification . . . . . . . . . . . . . . . . . . . . . . . .......... ....... .. 30-12 30.6.1 ZON-MAN 01 (Start the Onsite Standby Diesel Generator) . ..... 30-12 ,

30.6.2 LPM-MAN 01 (Recognize the Need for Reactor i Coolant System Depressurization) .. ..... .... .... .. . 30-13 30.6.3 LPM-MAN 02 (Recognize the Need for Reactor Coolant System Depressurization . . . . . . . . . . . . . . .. . .. . . 30-16 30.6.4 LPM-MANOS (Recognize the Need for Reactor Coolant System Depressurization . . . ........ ...... .. . 30-16 30.6.5 LPM-REC 01 (Recognize the Need for Reactor Coolant System Depressurization . . . . . ................ . . 30-17 30.6.6 ADN-MAN 01 (Actuate the Automatic Depressurization System) . . . 30-18 30.6.7 ADN-REC 01 (Actuate the Automatic Depressurization System) . . . . 30-19 30.6.8 CCB-MAN 01 (Start the Standby Component Cooling Water Pump) . . . . . . ... .... .. . .... ...... . 30-20 30.6.9 CCN-MAN 02 (Inadvertent Misalignment of Heat Exchanger) . . . . 30-21 i

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e Section Title Page 30.6.10 CIB-MAN 00 (Diagnose Steam Generator Tube Rupture) . . . . . . . . 30-21 30.6.11 DUMP-MAN 01 (Operate Steam Dump Valves) . ............. 30-22 30.6.12 CIC-MAN 01 (Isolate Containment) ...... ... .... . . . . . . . 30-23 30.6.13 ADS-MANTEST (Recognize the Need and Reclose ADS Stage MOV) . . . . . . . . . . . ......... ... ............. 30-24 30.6.14 CAN-MANOS (Locally Close Manual Valve CAS-V204 to Isolate Containment) . ............ .. ......... .. . 30-26 30.6.15 CIT-MANOS (Isolate Containment) ........... . ....... . 30-27 30.6.16 CNM-MAN 01 (Actuate Core Makeup Tank) . . . . . . . . . . . . . . . . . 30-27 30.6.17 CNM-REC 01 (Actuate the Core Makeup Tanks) . . . . .... . . . . 30-29 30.6.18 CVN-MAN 00 (Align Chemical and Volume Control System) . . . . . 30-29 30.6.19 CVN-MAN 02 (Align Chemical and Volume Control System) . . . . . 30-30 30.6.20 CVN-MANO3 (Start Chemical and Volume Control System Pump B) . . . . . ......... ......... .. .. ......... 30-31 30.6.21 ADF-MAN 01 (Depressurize the RCS to Refill the Pressurizer) . . . . . 30-32 30.6.22 SGHL-MAN 01 (Isolate Feedwater to Failed Steam Generator) . . . . . 30-32 30.6.23 CAN-MAN 01 (Start Standby Compressor) ......... .. . . . . . 30-33 30.6.24 REN-MAN 02 (Initiate Recirculation) ......... ..... ...... 30-34 30.6.25 REN-MANO3 (Initiate Recirculation) .. . .. ... .... . . . 30-35 30.6.26 IWN-MAN 00 (Operate In-Containment Refueling Water Storage Tank Motor-Operated Valves) ....... . ......... . 30-36 30.6.27 RHN-MAN 01 (Align Normal Residual Heat Removal System) . . . . 30-37 30.6.28 RHN-MANDIV (Align Normal Residual Heat Removal System) . . . 30-39 30.6.29 RHN-MAN 02/RHN-MANO3 (Align Normal Residual Heat Removal System) . ....... ......... . ....... . . . . 30-40 30.6.30 PCN-MAN 01 (Actuate Passive Containment Cooling System) . . . . 30-41 30.6.31 HPM-MAN 01 (Diagnose Need for High Pressure Heat Removal) ............ ............... ... . . . . . . . 30-42 30.6.32 PRN-MAN 01 (Align Passive Residual Heat Removal System) . .. 30-43 30.6.33 PRN-MAN 02 (Align Passive Residual Heat Removal System) ... . 30-44 30.6.34 PRN-MANO3 (Align Passive Residual Heat Removal System) . . . . 30-45 30.6T PRI-MAN 01 (Isolate Failed Passive Residual Heat Removal Heat Exchanger) ...... ........ ..... ....... . . . . . . 30-46 30.6.36 REN-MAN 04 (Initiate Recirculation) ..... ... .... .. ... . 30-47 30.6.37 RCN-MAN 01 (Trip Reactor Coolant Pumps) . . . . .... . ... . 30-48 30.6.38 ATW-MAN 01 (Manually Insert Control Rods) ... . ... . . . . . 30-49 30.6.39 ATW-MANO3 (Manually Trip the Reactor through Protection and Safety Monitoring System in One Minute) .............. . 30-50 30.6.40 ATW-MAN 04 (Manually Trip the Reactor through Diverse Actuation System in One Minute) .. .... ..... . . . . . . . 30-51 Revision: 9 O

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Section Title PaZe I 30.6.41 ATW-MANOS (Manually Trip the Reactor through Protection k and Safety Monitoring System in Seven Minutes) . . . . . . . . . . . . . 30-52 1 30.6.42 ATW-MAN 06 (Manually Trip the Reactor through Diverse Actuation System in Seven Minutes) ..... ....... .. .... 30-53 30.6.43 RTN-MAN 01 (Perform Controlled Reactor Shutdown) . . . . . . . . . 30-53 l 30.6.44 FWN-MAN 02 (Start the Startup Feedwater Pumps) . . . . . . . . . 30-54 l 30.6.45 FWN-MAN 03 (Start the Startup Feedwater Pumps) . . . . . . . . . . . . 30-55 30.6.46 REG-MAN 00 (Regulate Startup Feedwater) . . .. ........... 30-56 .

30.6.47 CIA-MAN 01 (Isolate Failed Steam Generator) . . . .. . . . . . . . 30-57 30.6.48 CIB-MAN 01 (Close Main Steam Isolation Valve) .. .. . . . . 30-58 l 30.6.49 SGA-MAN 01 (Inadvertent Opening of Steam Generator Power-Operated Relief Valve) . .... .......... .... ... 30-59 30.6.50 SWN-MAN 0lN (Open Air-Operated Valve on Motor Strainer Line) . ...... .. ... .... . . ... . . . . . . 30-60 30.6.51 SWB-MAN 02 (Start Standby Service Water Pump) . . . . . . . . . . . 30-61 ,

30.6.52 SWB-MAN 02N (Start Standby Service Water Pump) .........

30-62 30.6.53 TCB-MAN 01 (Start Standby Turbine Closed Cooling

- Water Pump) . ... ......... ..... .. .......... . . . 30-63 30.6.54 TCB-MAN 02 (Locally Align Standby Turbine Closed Cooling Water Heat Exchanger) . . . . ...... ........... . . . . . . 30-64 {

30.6.55 VLN-MAN 01 (Actuate Hydrogen Control System) . .. . .. . 30-65 l 30.6.56 VWN-MAN 01 (Align Standby Chiller) . . . . . . . . . .. .. .. . 30-66 L 30.6.57 ATW-MAN 11 (Recognize the Need for Manual Boration) . . . . . . . . 30-67 30.6.58 REC-MANDAS (Diagnosis of an Event Through DAS Signals or Perform an Activity by Operating DAS Controls) . . . . . . . . . . 30-68 {

30.6.59 RHN-MAN 04 (Isolate the RNS during Shutdown Conditions) . . . . 30-68 j 30.6.60 RHN-MANOS (Initiate Gravity Injection from IRWST via l RNS Suction Line) . . . . ....... .... ...... . ... 30-70 30.6.61 RHN-MAN 06 (Recognize the Need and 'Ihrottle RNS {

Valve V011) . . . . . . . . .............. . .... .. ... 30-71 30.6.62 RCS-MANODS1 (Close AOVs CVS-V045 or -V047, Given l Failure of HL Level Instruments) ...... . .. .. .. . . 30-72 30.6.63 RCS-MANODS2 (Close AOVs CVS-V045 or -V047, Given Failure of Valves to Close Automatically) . ... . .. ... . . . 30-73 l 30.6.64 SWN-MANO3 (Recognize the Need and Locally Refill i Service Water Basin) ....... . ..... ...... . . 30-74 I 30.7 Conditional Probability Evaluation . . . ......... ........ . . . . . . 30-75 l 30.7.1 Application . . . . . . . . . . ......... . ..... .. .... . 30-76  !

30.7.2 Process Used to Determine Dependencies . . . . . . .. 30-76  !

30.7.3 Calculation of Dependent Human Error Probabilities ..... .... 30-77 l 30.8 References . . . . . . . . ........................... .. .. . .. 30-78 g

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e Section Title Page CHAPTER 31 OTHER EVENT TREE NODE PROBABILITIES 31.1 Introduction .. .. ................................... . . 31-1 31.2 Identification of Cases Requiring Calculations . . ..... ....... ....... 31-1 31.2.1 BL - Main Steam Line Break Occurs Inside Containment . ....... 31-1 31.2.2 CNB -- Containment Isolation Fails Due to Reactor Coolant System Vessel Rupture . . . . .............. .. . . 31-1 31.2.3 MGSET - Control Rods Motor-Generator Set Trip ......... .. 31-1 31.2.4 NSGTR -- Consequential Steam Generator Tube Rupture . . . . .... 31-2 31.2.5 PO - Pre-existing Containment Opening Allowing Bypass . . . . . . . . 31-2 31.2.6 PRES - Reactor Coolant System Pressure Relief via Pressurizer Safety Valves . . . . . . . ..... .. ..... ... .... 31-2 31.2.7 PRSOV -- Pressurizer Safety Valves Reclose .. .... ..... . 31-2 31.2.8 R05 -- Offsite Power Recovered within One-half Hour .... .. . . 31-2 31.2.9 SLSOV -- Main Steam Line Relief Valves Reclose . . ... . 31-2 31.3 Case-Specific Calculations . . .. ........... ....... . . 31 3 31.3.1 BL - Main Steam Line Break Occurs Inside Containment . . . . . . . . 31-3 31.3.2 CNB -- Containment Isolation Fails Due to RCS Vessel Rupture . 31-3 31.3.3 MGSET - Control Rods Motor-Generator Set Trip . . . . . . .. . . 31-4 31.3.4 PO -- Pre-existing Containment Opening Allowing Bypass . . .. . 31-4 31.3.5 PRES - Reactor Coolant System Pressure Relief sia Pressurizer Safety Valves . . . . . . . . . . . . .......... .. 31-4 31.3.6 PRSOV -- Pressurizer Safety Valves Reclose .. .. .. . .... 31-8 31.3.7 R05 -- Offsite Power Recovered within One-Half Hour . . . . ...... 31-8 31.3.8 SGTRI -- Single Consequential Steam Generator Tube Runture . . .. 31-9 31.3.9 SGTR - Multiple Consequential Steam Generator Tube Rupture . . . 31-10 31.3.10 SLSOV -- Main Steam Line Relief and Safety Valves Reclose . . . 31-11 31.3.11 SLSOV1 - Main Steam Line Relief and Safety Valves Reclose ... 31-12 31.3.12 SLSOV2 - Main Steam Line Safety Valves Reclose ........ .. 31-12 31.3.13 SLSOV3 - Main Steamline Relief and Safety Valves Reclose, SGTR. ... .. .... .... .. ............ . 31-13 31.3.14 BSIZE -- Large LOCA Break Size Sufficient for Gravity Injection without ADS if Containment Isolation Fails .. .. 31-13 31.4 References .... . . ...... .. ... .. ....... . .. 31-14 CHAPTER 32 DATA ANALYSIS AND MASTER DATA BANK 32.1 Data Analysis . . . . . . . . . .... ..... .. ................... . .32-1 32.1.1 Random Component Failure Data . . . .... . ... . 32-1 32.1.2 Test and Maintenance Unavailability . . . ..... ... .... 32-2 32.1.3 Common Cause Failure Data . . . . . . . . .. ... .. .. . 32-2 32.1.4 Human Reliability Data . .... ... ... ...... ... .. 32-2 32.1.5 Initiating Event Frequency Data ........ 32-2 e

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Section Title hge 32.2 Master Data Bank . . . . . . . . .................... ......... . . . 32-3 32.2.1 Initiating Event Frequencies ....... .. ........ ..... ... 32-3 32.2.2 Random Component Failures . ..... .... . . ... . . 32-3 32.2.3 Common Cause Failure Probabilities ... ....... ....... . .32-3 32.2.4 Human Error Probabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2-3 32.2.5 System-Specific Calculations . . ..... ......... ......., .32-3 32.2.6 Other Event Tree Node Probabilides . . .. ............ ... . 32-4 32.2.7 Master Data Bank . . . ... ... ... . . . . . . . . . . . . . . . . 3 2 -4 32.3 References . . ................................. .. .. . 32-4 CHAPTER 33 FAULT TREE AND CORE DAMAGE QUANTIFICATION 33.1 Introduction . ........ ... .. ... ....... .. .... .... 33-1 33.2 Fault Tree Model Quantification . . .... .......... .. . . . . . . 3 3- 1 33.3 Event Tree Model Calculation . . . ........ . ... ...... ... . 33-2 33.3.1 Core Damage Quantification Method . . . . . . . . .. . . . . . 33-2 33.3.2 Input Files and Data . .............. ......... .... 33-4 33.3.3 Definition of Consequential Event Categories . . ..... . 33-4 g 33.3.4 Plant Core Damage Frequency ............. .......... . . 33-6 i]

\ CHAPTER 34 SEVERE ACCIDENT PHENOMENA TREATMENT 34.1 Introduction . ......... .... .. ... ............. ... .. 34-1 34.2 Treatment of Physical Processes . . .. ................ ... .. . 34-1 34.2.1 In-Vessel Retention of Molten Core Debris . . ................ 34-2 34.2.2 Fuel-Coolant Interaction (Steam Explosions) . . .. . . .. . 34-2 34.2.3 Hydrogen Combustion and Detonation .......... .. .. . 34-3 34.2.4 High-Pressure Melt Ejection . ...... ........... . .. . 34-4 34.2.5 Core Debris Coolability . . . . . . ... .. ... .. .... ... 34-5 34.2.6 Elevated Temperatures (Equipment Survivability) . . . .... .... 34-5 34.2.7 Summary . . . . . . . . . . . . . . ....... ....... ... ..... 34-8 34.3 Analysis Method . . . . . . . . ............... . ................ . 34-9 34.4 Severe Accident Analyses . . . . . . . . . . . . . . . . . . . . . . . ............ . 34-10 34.4.1 Accident Class 3BE - Intact Containment . . .. .. ... . 34 10 34.4.2 Accident Class 3BE - Failed Containment . . . . . . . . ........ 34-12 34.4.3 Accident Class 3BL - Intact Containment ......... ....... 34-15 34.4.4 Accident Class 3BL - Failed Containment . . ..... . . . . . . . . . . 34- 17 34.4.5 Accident Class 3BR - Intact Containment .. .. ............. 34-18 34.4.6 Accident Class 3BR - Failed Containment . . . . .. .. ...... 34-19 34.4.7 Accident Class 3C - Intact Containment . ....... .. ..... 34-19 34.4.8 Accident Class 3C - Failed Containment . ............... . 34-20 34.4.9 Accident Class 3D - Intact Containment .. .. . ..... ... . 34-20 34.4.10 Accident Class 3D - Failed Containment . . . . . . . . ........ .. 34-21

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Section Title P_.jyte 34.4.11 Accident Class 6E - Bypass Containment ....... ... .. .. 34-22 34.4.12 Accident Class 6L - Bypass Containment ...... . . . . . . . . . . . 34 24 34.4.13 Accident Class I AP . . . . . . . . . . . . . . . . . . . . . . . ...... .. 34-25 34.4.14 Accident Class I A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-26 34.5 Summary ........... ................ ..... ... .. .. . 34-28 34.6 Insights and Conclusions . ........... . . . . . . . . . . . . . . . . . . . . . . . 34-2 8 34.7 References ... .... ..................... ......... ... .. 34-28 CHAPTER 35 CONTAINMENT EVENT TREE ANALYSIS 35.1 Introduction ........ . . ............. . . ......... . . 35-1 35.2 Containment Event Tree - General Discussion .. .. .......... .. 35-1 35.3 Event Tree Construction . . . . . . . . . . . .. . .... .... .. .... . 35-2 35.4 Level 1/ Level 2 Interface . . . . . . . . ........... .... . ... .... 35-3 35.5 Containment Event Tree Top Events . .... . ......... .... 35-3 35.5.1 Severe Accident Phenomena Considerations . . . . . . . . .. .... 35-4 35.5.2 Operator Action and Systems Top-Event Considerations . . . . . . . .. 35-5 35.6 Release Category Definitions . . . . . . . . . . .. ..................358 35.6.1 Release Category BP - Containment Bypass . . . . . . ........ .. 35-9 35.6.2 Release Category CI - Containment Isolation Failure . . . .... 35-9 35.6.3 Release Category CFE - Early Containment Failure . . . . . . . . . . . 35-10 35.6.4 Release Category CFI - Intermediate Containment Failure . . . . . . . 35-10 35.6.5 Release Category CFL - Late Containment Failure . . ........ . 35-10 35.6.6 Release Category IC - Intact Containment . . . . . . . . . . . . . . . 35-10 35.7 Top-Event Nodal Questions and Success Criteria . . . . . . . . . . ... .... 35-11 35.7.1 Top Event DP - RCS Depressurization After Core Uncovery . . . . . 35-11 35.7.2 Top Event IS - Containment Isolation . . . . . . . . . . . . . . . . . . . . . 35-13 35.7.3 Top Event IR - Reactor Cavity Flooding .. ........ .. . 35-14 35.7.4 Top Event RFL - Reflooding of a Degrade /. Core ....... .. . 35-15 35.7.5 Top Event VF - Debris Relocation to tb Reactor Cavity . . .. 35-15 35.7.6 Top Event PC - Passive Containmer.1 Cooling . .. .. . ... 35-16 35.7.7 Top Event IG - Hydrogen Control System . . . . . . . . . . . . . . . 3 5- 17 35.7.8 Top Event DF - Diffusion Flame . . .... ......... .... 35-17 35.7.9 Top Event DTE - Early Hydrogen Detonation ...... . . ... 35-18 35.7.10 Top Event DFG - Hydrogen Deflagration .. .. ..... . . . . . . 35-19 35.7.11 Top Event DTI - Intermediate Hydrogen Detonation . . . . . .. . . 35-19 35.8 Summary . . . .. .. ... ............... ............. . . . . 35-20 35.9 References ........ .................. ..... .. ........ . 35-20 Revision: 9 0

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Section Title Page CHAFTER 36 REACTOR COOLANT SYSTEM DEPRESSURIZATION 36.1 Introduction ... .. . . .... .. . . .. ... 36-1 36.2 Definition of High Pressure . ..... . ... ........ . .... . . . 36 1 36.3 Node DP .... . .. . ..... .. .... ........ ... .. . . . 36-2 36.4 Success Criterion . . .... .. .. .... .. ..... ... ... . . 36-2 36.4.1 Accident Classes 3BE. 3BL,3BR. 3C . . ....... . ... ... 36-3 36.4.2 Accident Classes 1D and 3D . . ...... ...... .. . . . . 36-3 36.4.3 Accident Classes 1 A and 1 AP ..... ....... ... ...... . 36-3 36.5 Anticipated Transient Without Scram - Accident Class 3A . .. . .. . . . . 3 6-5 36.6 Steam Generator Tube Rupture - Accident Class 6. .. ... .. ...... 36-5 36.7 References .. .. .. ....... ..... . .... . . ... . . . . 36-6 CHAPTER 37 CONTAINMENT ISOLATION 37.1 Introduction . .. .. . .... . . ..... . . . ....... . 37-1 37.2 Definition of Containment Isolation . . . . . . . . . .. . ....... 37-1 37.3 Success Cntena ............... ......................... . 37-1 Accident Classes IA and LAP ..................... .

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V 37.3.1 37.3.2 Accident Class 3A . . . . . . . . . .. ...................

37-2 37-2 37.3.3 Accident Class 3BR . . . . . . . . . . .......... .. ........ 37-2 37.3.4 Accident Class 3BE ............ . ... ... ........... 37-2 37.3.5 Accident Class 3BL .. .. ..................... .. ... 37-2 37.3.6 Accident Class 3C . ... .... . ... . ... .. ... . 37-3 1 37.3.7 Accident Class 3D/lD .... ... ... ...... ........ ... 37-3 Accident Class 6 . . . . . . . . . . . . ...... .............

37.3.8 .. 37-3 37.4 Summary ... .. . ............... ............. . . . . . . . . 3 7-4  ;

37.5 References ............ . . .... .. ........ .. ......... 37-4 j t

CHAPTER 38 REACTOR VESSEL REFLOODING 38.1 Introduction ..................... .........................38-1 38.2 Definition of Reflooding Success . . . . . ...... ........ .... . . . . 38-1 38.3 Success Criteria . . . . . . . . . . . . . . . . .... .......... . ... . . . . . 3 8- 1 38.3.1 Accident Classes l A and I AP . . . ... ... . . ............ 38-1 38.3.2 Accident Class 3BR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 8-2 38.3.3 Accident Class 3BE . . . . . . . . . . . ... ..... . . . . . . . . . . . . . 3 8-2 38.3.4 Accident Class 3BL . . . . . .. ................... . . 38-3 1 38.3.5 Accident Class 3D/lD .... ... . ........ . ... . . . . 3 8-4 38.3.6 Accident Class 6 . . . . . . . . . . . . . . ........ ...... . . 38-4 1 38.3.7 Accident Class 3C . . . . . . ..... . ... ............ . 38-4 1 38.3.8 Accident Class 3A . . .. .... .. ... ... ... ... . 38-4 1 38.4 Summary . . . . .. ......... . . 38-4 e)

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.SEli.931 T.Ltit Eau CHAPTER 39 IN-VESSEL RETENTION OF MOLTEN CORE DEBRIS 39.1 Introduction .......................... .................. . 39 1 39.2 Summary of In-Vessel Retention ROAAM . . . . . . . . . . . . . . . . . . . . . . . . . . 39-2 39.3 Reactor Coolant System Depressurization . . .. ....... ...... . ... 39-4 39.4 Reactor Cavity Flooding (Node IR) . . . . ..................... . . . 39-4 39.4.1 Success Criteria . . . . . . . ........................... . 39-4

. 39.4.2 Cavity Flooding Scenario Dependencies . . . . . . . . . . . . . . . . . . . . . 39-6

. 39.5 Reactor Vessel Insulation Design Concept . . . . . . . . . . . . . . . . . . . . . . . . . . 39-7 39.5.1 Description of Insulation . . . . . ..................... . . . 39-8 39.5.2 Determination of Forces on Insulation and Support System . . . . . . . 39-9 39.5.3 Conclusion . . . . . . . . . ...... .. .............. . . . . 39-12 39.6 Reactor Vessel Extemal Surface Treatment . . . . . ....... . .... . . . 39-13 39.7 Reactor Vessel Failure (Node VF) ... .. . . ...... ... .. . .. 39-13 39.7.1 Node VF Success Criteria . . ................. . . . . 39-13 39.8 S u mm ary . . . . . . . . . . . . . . . . . . ... .................... . . . . 39-14 39.9 References ........... ... ... . .... . . . . . . . . . . . . . . . . . . . . 3 9- 14 CHAPTER 40 PASSIVE CONTAINMEffr COOLING CHAPTER 41 HYDROGEN MIXING AND COMBUSTION ANALYSIS 41.1 Discussion of the Issue . . . . . . . . . . . . . ............. . . . . . . . . . . . . 41 - 1 ,

41.2 Controlling Phenomena . . . . . . . . . . . . .. ........... ........ .. 41-2 41.3 Major Assumptions and Phenomenological Uncertainties . . . . .......... . 41-3 41.3.1 Hydrogen Generation . . . . . . . . . . ................ ...... 41-3 41.3.2 Containn.ent Pressure . . . . . . . . ..................... .. 41-3 41.3.3 Flammability Limits . . . . . . . . ... . .. .... ........ 41-4 41.3.4 Detonation Limits and Loads . .. ... .. ..... ........ 41-4 41.3.5 Igniter System . . . . . . . . . . . .. ........ ............ 41-5 41.3.6 Other Ignition Sources . . . . . . . ..................... .. 41-6 41.3.7 Severe Accident Management Actions ............. ........ 41-6 41.4 MAAP4 Hydrogen Cases . . . . . . . ......... ..... ......... .. 41-6 41.4.1 Modeling Assumptions and Limitations . .............. ... . 41-6 41.4.2 MAAP4 Hydrogen Generation and Mixing Analyses . ........ 41-9 41.4.3 MAAP4 Hydrogen Burning Analyses . . . . . . . . . . . . . . . . . . . . . . 41-18 41.5 Early Hydrogen Combustion . ... ... ... ........ .... ... . 41-20 41.5.1 Hydrogen Generation Rates . ..... ....... .. ... .. . 41-20 41.5.2 Hydrogen Release Locations ......... .. .. .. .. . 41-22 41.5.3 Early Hydrogen Combustion Ignition Sources .. .. ...... . 41-23 41.6 Diffusion Flame Analysis - CET Node DF . ...... ..... . ...... . 41-24 i 41.6.1 Diffusion Flame Analysis Summary ... ...... .. ..... 41-24 41.6.2 Node DF Containment Failure Probability Assignment ..... . . 41-25 .

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Section Title Pgte 41.7 Early Hydrogen Detonation - Containment Event Tree Node DTE ........ 41-25 41.7.1 Containment Success Criteria at Node DTE . . . . . . . .......... 41-25 41.7.2 Early Hydrogen Detonation Decomposition Event Tree ........ 41-26 41.8 Sherman-Berman Methodology for Evaluating the Potential for Deflagration-to-Detonation Transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 -2 7 41.8.1 General Description of the Sherman-Berman Methodology ....... 41-27 41.8.2 Compartment Geometry . . . . . . . . . . . . . . . . . . . . . . . . ..... 41-27 41.8.3 Mixture Reactivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 -28 41.8.4 Deflagration-to-Detonation Transition Probability . . . . . . . . . . . . . 41 -28 41.8.5 Application of Sher: nan-Berman Methodology to the AP600 for Deflagration-to-Detonation Transition in Time Frame 2 . ........ 41-29 41.9 Deflagration in Time Frame 3 . . . . . . . ........ ... ... . . . . . . . . 41 -30 41.9.1 Containment Success Criterion.at Node DFL . . . . . ........... 41-30 41.9.2 AICC Peak Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41-31 l 41.9.3 Conditional Containment Failure Probability from Deflagration . . . . 41-32 41.10 Detonation in Intermediate Time Frame . .. ............ . . . . . . . . . 41 -3 8 41.10.1 Containment Success Criterion at Node DTI .. . ..... . 41-38  ;

41.10.2 Mixing and Stratification . . .. ........... .. . . ..... 41-38 l 73

. . . . . 41 -3 8 (V ) 41.10.3 Quantification of DTI Failure Probabilities 41.10.4 Hydrogen Stratification Sensitivity . . . . . .

........ 41-39 l l

41.11 Safety Margin Basis Containment Performance Requirement . .......... 41-39 41.12 S u mmary . . . . . . . . . . . . . . . . . . . . ............ . . . . . . . . . . . . 41 -40 41.13 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 -41 CHAITER 42 CONDITIONAL CONTAINMENT FAILURE PROBABILITY DISTRIBUTION 42.1 Introduction ... ..... .... .............. ... ...... . . . . 42-1 42.2 Probabilistic Model . . . . . . ................ ..... . . . . . . . . . . . 4 2- 1 42.3 Containment Failure Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-2 42.3.1 Median Values for Containment Failure .. .............. . . 42-2 42.3.2 Uncertainties in Containment Failure .... .... . . . . . . . . . . . . 4 2-3 42.4 Containment Failure Predictions . . ..............,................42-5 42.4.1 Containment Cylindrical Shell . . ........ . .. .... .. 42-5 42.4.2 Ellipsoidal Upper Head . . . . . . . . . . . . ...... .. . . . . . . . . 4 2-5 42.4.3 Equipment Hatches ..... ... .. ... .... . . . . . . . . . . . . . 4 2-6 42.4.4 Personnel Airlock . ............... .. ............. . 42-6 l 42.5 Overall Failure Distribution . . . . . . . ........... . ..... ..... .. . 42-7 42.6 Summary and Conclusions . . . . . . ........ ....... .......... .. 42-8 42.7 References . . .........................................42-8 t

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O Section Title Page CHAPTER 43 RFIFASE FREQUENCY QUANTIFICATION 43.1 Containment Event Tree Quantification . . . . . . . . .. ................43-1 43.1.1 Containment Event Tree Base Quantification . . . . . . . . ........ 43-1 43.2 Accident Class 3BE . . ........................ . ............ 43-2 43.3 Accident Class 3BL . . . . . . . .. ......... .................. . . 43-2 43.4 Accident Class 3BR . . . . . . . . . . . . . . ..... ....... ...... . . . . . 43-3 43.5 Accident Class l A . ... . ... . ........ ........... . . . . . . . 43-3 43.6 Accident Class I AP . . . . . ....... .... .. ............. . . . . . 43-4 43.7 Accident Class 3A . . . . ...... .......... ..... . . . .... .. . 43-4 43.8 Accident Class 3C . . . . . . . ....... ... .. .... ......... ..... 43-5 43.9 Accident Class 3D ............ . .. .. . ......... ....... . 43-6 43.10 Accident Class 6 (6E+6L) . . .. ........ .. .. ...... ....... . 43-6 43.11 Accident Class I D . . . . . . . . . . . . . . . . . . . . . . . ... ... . ...... . 43-7 43.12 Large Release Frequency Importance and Sensitivities . .. . . ... ... 43-7 43.13 Containment Event Tree Conclusions and Insights . . ..... ... . . . . 43-7 CHAPTER 44 MAAP4 CODE DESCRIPTION AND AP600 MODELING 44.0 MAAP Background . . . . . . . . .. .. .......... ... ..... . 44-1 44.1 MAAP4 . . . . . .... .................. .................. 44-1 44.2 The AP600 MAAP4 Modeling ... . . .......... ....... ... 44-3 44.3 Benchmarking .............................. .. ........ 44-6 44.4 Summary and Conclusions . . . . .. ... .. ..... ... ....... 44-7 44.5 References ..... ...... .. .. ... .. . . ... ... .... .. 44-7 CHAPTER 45 FISSION-PRODUCT SOURCE TERMS 45.1 Summary of AP600 Release Categories . .. ........ ...... . . 45-1 45.2 Release Category Source Terms . . . . . . . . . . . . . . . . ... . ...... . 45-2 45.2.1 Release Category IC . . . . . . .. . .. . . . ..... .45-2 45.2.2 Release Category BP . ........ . ....... .......... 45-3 45.2.3 Release Category CI . . . .......... ........ .... .. . . 45-3 45.2.4 Release Category CFE . .. ... .............. .. . . . 45-4 45.2.5 Release Category CFI . . ...... . ..... ..... . .. .. 45-4 45.2.6 Release Category CFL . . . . . . ..... ....... ....... . .. 45-5 45.3 Direct-Release Sensitivity Case . ...... . . ............ . .. . 45-5 45.4 MAAP4 Model Parameter Sensitivities . .... ................... . 45-6 45.4.1 FPRAT Sensitivity . ..... .. .. ....... . . . . 45-6 45.4.2 FAERDC Sensitivity . . . . ..... ...... ...... ... . 45-6 45.5 Comparison with NUREG-1150 Results . . . . .. ... ... . .. ... . . 45-6 45.6 Summary . . . . . . . . . . . . . . ............. . ... . . .... ... 45-6 45.7 References .... . .. . . .... ........ .... 45-7 Revision: 9 9

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Section Title Page CHAPTERS 46 THROUGH 48 DELETED CHAPTER 49 OFFSITE DOSE EVALUATION 49.1 Introduction ........... ...... ...................... . . . . 49-1 49.2 Conformance with Regulatory Requirements . . . . . . . . . . . . . . . . . . . . .... 49-1 49.3 Assumptions . . . . . . . . . . .................... . .............492 49.4 Methodology . . . . . ................................. ....... 49-2 49.5 Dose Evaluation Results and Discussions . . . . . . . . . . . . . . . . . . . . . . . . . . . 49-6 49.6 Quantification of Site Risk . . ............... . . . . . . . . . . . . . . . . . 4 9-7 49.7 Risk Quantification Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49-7 49.8 References . . .......... .............. . . . . . . . . . . . . . . . . . . . 4 9- 8 CHAPTER 50 IMPORTANCE AND SENSITIVITY ANALYSIS 50.1 Introduction .. . ................ ........ ......... .. . 50-1 50.2 Imponance Analyses for Core Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 0- 1, 50.2.1 Initiating Event Importances (Case 1) . . . . . . . . . . . . . . . . . . . . . . . 50-2 50.2.2 Common Cause Failure Importances (Case 2) . . . ........ . . . . 50 3 O 50.2.3 Human Error Importances (Case 3) . . . . . . . . . . . . . . . . . . . . . . . . . 50-5 50.2.4 Component Importances (Case 4) . . . . . . . . . . . . . . . . . . . . . . . . . 50-6 50.3 System Importances for Core Damage .......................... . . 50-7 50.4 Human Error Sensitivity Analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 0-9 50.4.1 Set Human Error Probabilities to 1.0 (Failure) in Core Damage Results (Case 25) . . . ................................. 50-9 50.4.2 Set Human Error Probabilities to 0.0 (Success) in Core Damage Results (Case 26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 50-10 50.4.3 Assess Importance of Increasing Human Error Probabilities by a Factor of 10 (Case 27) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-10 50.5 Other Sensitivity Analyses for Core Damage . . . . . . . . . . . . . . . . . . . . . . 50-11 50.5.1 Diesel Generator Mission Time (Case 28) . . . . . . . . . . . . . . . . . 50- 1 1 50.5.2 Impact of Passive System Check Valves on Core Damage Frequency (Case 29 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50- 12 50.5.3 Instrumentation and Control Cutoff Probability (Case 30) . . . . . . . . 50-12 50.5.4 Containment Recirculation After Safety Injection Line Break l Event (Case 31) . . . . . . . ............. ......... . 50-12 50.5.5 Quantification Tmncation Probability (Case 32) . . . . . . . . . . . . . . . 50 13 l 50.5.6 Sensitivity to ADS Stage 4 Success Criteria (Case 33) ........ . 50 13 50.5.7 Squib Valve Failure Probability (Case 34) . . . . . . . . . . . . . . . . . . . 5 0- 13 50.5.8 Circuit Breaker Failure Probability (Case 35) . . . . . . . . . . . . . . . . . 50 14 50.5.9 End-State Importances (Case 36) . . . . . . ... .............. 50-14 v ,

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e Section Title Page 50.6 Sensitivity and Importance Analyses For Large Release Frequency . . ... . 50-15 50.6.1 Importance Analyses For Large Release Frequency . . ....... 50-15 50.6.2 Sensitivity Analyses For Large Release Frequency . .. .. . . 50-21 50.7 Sensitivity Analysis for Offsite Dose Risk . . . . . . . . . ... ... . 50-22 50.8 Results Summary . .... ..... . . ....... .. . . . 50-23 Attachment 50A ATWS PRA Sensitivity Case . . . . . .... ................. 50A-1 CHAPTER 51 UNCERTAINTY ANALYSIS 51.1 Introduction .. . ........ . ... ..... . .... . .... 51-1 51.2 Methodology .. . .. .... . . . ...... .... .. ..... 51-1 51.3 Summary of Results . ... . .. . .. .... .. . .. .. . 51-3 51.4 Sensitivity Studies for the Uncertainty Calculations .. .. .. .. ...... . 51-4 51.4.1 Uncertainty in the Cutoff Frequency ........ . . ... 51-4 51.4.2 Uncertainty in the Number of Cutsets Sampled . .. 51-4 51.4.3 Uncertainty in the Mean Failure Probability for Basic Events . . . 51-4 51.4.4 Sensitivity to the Random Number Input for Sampling . . . . . . . . . . . 51-5 51.5 References .. ............. . .. ..... ... . . . .... 51-6 CHAPTER 52 RTNSS - FOCUSED PRA SENSITIVITY STUDY 52.1 Focused PRA Sensitivity Study Analysis Method . . . . . . . .. .... .. 52-1 52.1.1 Core Damage Frequency Calculation .. . . . ........ 52-2 52.1.2 Release Frequency Calculation . . .. .. . . .. ... 52-5 52.2 At-Power Focused PRA Sensitivity Study . . . ...... . . . .. .. 52-5 52.2.1 At-Power Focused PRA Sensitivity Study Core Damage Frequency Quantification . ... . . .. ...... .. .. 52-6 52.2.2 At Power Focused PRA Sensitivity Study Release Frequency Quantification .. .... ........ ..... . ... 52-11 52.3 Shutdown Focused PRA Sensitivity Study . . . . . . . . ...... .. . . . . 52-16 52.3.1 Shutdown Focused PRA Sensitivity Study Core Damage Quantification . . ..... . .. . . . .. 52-16 52.3.2 Shutdown Focused PRA Sensitivity Study Release Frequency Calculation . . . . .. .. .. . . . . . . . . . 52-19 52.4 Focused PRA Sensitivity Fire Analysis . . . . . . ..... . .. .... . 52 21 52.5 Focused PRA Sensitivity Study Flooding Analysis . . ....... .. 52-21 52.5.1 At-Power Focused PRA Sensitivity Study Flooding Scenarios . . . . . 52-21 52.5.2 Shutdown Focused PRA Sensitivity Study Flooding Scenarios . . . . . 52-22 52.5.3 Focused PRA Sensitivity Study Flooding Analysis Results Summary . ... ... ...... ...... .... . . .. 52-23 52.6 Focused PRA Sensitivity Study Results and Conclusions . . . .. . ..... 52-23 52.7 References . ... .. .... . .. - - - 52*14 O

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Section Title P,_ age CHAPTER 53 DELETED CHAPTER 54 LOW-POWER AND SHUTDOWN RISK ASSESSMENT 54.1 Introduction .... .................. ................... . . 54-1 54.2 Initiating Events .................. ................... ..... 54-1 54.2.1 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. 54-2 54.2.2 Events Modeled . . . . . . . . . . . . ...................... .. 54-2 54.2.3 Shutdown Phases Summary Description . . ..... . ....... . . 54-3 54.2.4 Initiating Events for Operanng Modes . . . . . . . . . . . . . . . . . . . . . . . 54-4 54.2.5 Actuanng Signals and Systems Available ................... 54-15 54.2.6 Scenarios for Detailed Analysis . . . . . . . . . . . . . . . . . . . . . . . . . 54-16 l 54.2.7 Summary of Initiaring Events Analyzed . . . . . . . . . . . . . . . . . . . 54-21 54.3 Data . . . . ................ ........................... 54-22 54.3.1 Shutdown Frequency . . ....................... ... . 54-22 54.3.2 Mission Times . . . . . . . . . . ...... ....... .. ......... 54-25 54.4 Event Tree Development . . ...... ........................... 54-28

- 54.4.1 Event Tree LOSP-ND . . .. ........................ . 54-30 l\ 54.4.2 Event Tree RNS-ND . ........................ . . . 54-33 54.4.3 Event Tree CCW-ND . . . . . . . . . . . . .................. 54-33 54.4.4 Event Tree LOCA-PR-ND ..... .................... 54-33 54.4.5 Event Tree LOCA-V24-ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-34 54.4.6 Event Tree RCS-OD . . . ....... .................... 54-36 54.4.7 Event Tree LOSP-D . . ............................ . 54-38 54.4.8 Event Tree RNS-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-40 54.4.9 Event Tree CCW-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-40 54.4.10 Event Tree LOCA-V24-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-40 54.4.11 Boron Dilution Events (Reactivity Events) . . . . . . . . . . . . . . . . . . . 54-41 54.4.12 Boron Dilution Events Due to Chemical and Volume Control System Opecation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-45 l 54.4.13 Endstates Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-48 ,

54.5 Fault Tree Models for Shutdown and Low-Power Events . . . . . . . . . . . . . . . 54-48 l

54.5.1 Instrumentation and Control Modeling for Shutdown (Level 1) .... 54-48 l 54.5.2 Instrumentation and Control Modeling for Shutdown (Level 2) .... 54-51 54.6' Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-51 54.6.1 MAAP4 Code Analysis for Shutdown Success Criteria . . . . . . . . . . 54-52 54.6.2 MAAP4 Parameter File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-52 54.6.3 MAAP4 Input Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 54-54 54.6.4 Definition of MAAP4 Cases From Event Trees . . . . . . . . . . . . . . . 54-55 54.6.5 Results From MAAP4 Analyses . . . . . . . . . . . . . ........... . 54-57 54.7 Common Cause Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 54-57 A

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O Section Title Page 54.8 Human Reliability Analysis ............ .......... . . . 54 57 54.8.1 Operator Actions Calculated . .... .... ......... .. .. 54-58 54.8.2 Conditiona! Human Error Probabilities . . . . . . . .. ...... . 54-64 54.9 Fault Tree Quantification ... ....... ............... .. . . 54-64 54.10 Level 1 Core Damage Frequency Quantification . ........ .... . .... 54-67 54.10.1 Core Damage Quantification Method ................. 54-68 54.10.2 Quantification Inputs ....... .. ................. .... 54-69 54.10.3 Level 1 Shutdown Core Damage Frequency Results . . . . ... .. 54-70 54.11 Shutdown and Low-Power Release Category Quantification . . . . . ... . . . 54-71 54.12 Shutdown Assessment Importance and Sensitivity Analyses . . . . . . . . . . . . . . 54-71 54.12.1 Importance Analyses for Core Damage at Shutdown . . . ... .. . 54-72 54.12.2 Other Sensitivity Analyses for Shutdown Core Damage . . . . . . . 54-77 54.13 Summary of Shutdown Level 1 Results . ... .. .. . ....... . 54-81 54.14 References . . . .-....... . .... .................... 54-87 Attachment 54A Design Change Impact on Low-Power and Shutdown Risk Assessment ... ............... ... . ..... . 54A-1 Attachment 54B Surge Line Flooding Effect on Low-Power and Shutdown Risk Assessment .... .. . .. ..... ... ....... . 54B-1 Attachment 54C Effect of Modifications to Safe / Cold Shutdown PRA .. ..... . 54C-1 CHAPTER 55 SEISMIC MARGIN ANALYSIS . . . .. ... . .... ... . 55-1 55.1 Introduction . ................. .. ... ............. .. . . 55-1 55.2 Calculation of HCLPF Values . .. .. ... . ... . ... .. . 55-2 55.2.1 Seismic Margin HCLPF Methodology .. ..... . . . . 55-2 55.2.2 Calculation of HCLPF Values .. . .... ...... . . 55-2 55.3 Seismic Margin Model . . . . . . . ...... . .. .. ... ....... . . . 55-12 55.3.1 SMA Model .?nd Assumptions . ........ . .... . . . . 55-14 55.3.2 Seismic Initiating Events . . .. .. ......... . . . . . . . 55-16 55.3.3 Initiating Event Category HCLPFs . . . . . . . . . . . . . . ..... . 55-17 55.3.4 Event Tree Models . . ... .... ..... .. ........... 55-20 55.3.5 Fault Tree Modeling and Quantification .. .... ..... . . 55-28 55.3.6 Seismic Event Core Damage Sequence Evaluation . ..... ... . 55-36 55.3.7 Containment Performance Model . .. .. .... .. .... . . 55-37 55.4 Calculation of Sequence and Plant HCLPF . ... ........ . . . . 55-38 55.4.1 HCLPFs for Basic Events . . . . . . . . . ... . ... .. ... . . 55-39 55.4.2 Calculation of Initiating Event HCLPFs .. ...... ... .. . 55-39 55.4.3 Calculation of System Fault Tree HCLPFs ..... . .... . . . . 55-39 55.4.4 Calculation of Sequence HCLPFs . .. ......... . . 55-40 55.4.5 Calculation of Plant HCLPF . ..... ............... . . 55-43 55.4.6 Large Release HCLPF . . . . .. . .... ......... . 55-43 Revision: 11 9

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1 55.5 Sensitivity Analyses . . . . . . . . . . . . . . . . . . . . . ........ ... .. . 55-46 1 55.5.1 Robust Fuel and Core Assembly ............ ... .. 55-48 I 55.5.2 Credit for Operator Actions . ... . ......... ...... .... 55-49 55.5.3 Less Credit for Operator Actions in LOSP Event at 0.09g . . ..... 55-52 55.5.4 72-Hour Mission Time . . . . . . . . . . . . ......... . . . . 55-53 55.5.5 Containment Isolation - Smaller Size Valves . . . . . . ... . .. . 55-56 55.5.6 Steam Generator Tube Rupture Success Criteria . . . . . . . . . .. . 55-57 55.5.7 Steam Line Break Success Criteria . . . ............. . . 55-58 55.5.8 Seismic Interaction Between Turbine and Auxiliary Buildings .... 55-59 55.6 SMA Results and Insights . . . . .. ....... ........ ..... .. .. 55-63 55.9.6 AP600 SMA Results ........... .. . . ... . . ... 55-63 55.9.6 AP600 SMA Insights . . . . . . . .... .. ... .. . .. 55-68 55.7 References ... . ... . .. .......... . ... ...... .. . 55-70 I Attachment SSA System HCLPF Calculations . . . . . . . . . . .... . 55A-1 Attachment SSB Sequence HCLPF Calculations . . . ... ... ... . .. . 55B-1 l

m Attechment 55C Seismic Margin Analysis HCLPF Sensitivity Study .. ... .. 55C-1 h

CHAPTER 56 PRA INTERNAL FLOODING ANALYSIS 56.1 Introduction .............. .. .... .... ...... .... . . . . 56-1 56.1.1 Definitions . . . . . . . . . . . . . .. .. .. .. .. .. . . . . 56-1 56.2 Methodology . . . . . . . . . . . ...................... ... .. . . . 56-1 56.2.1 Summary of Methodology . . . . . . . . . . . . . . . . . . . . . . . 56-1 56.2.2 Information Collection . . . . . . . . . ........... .. . . . 56-2 56.2.3 Initial Screening Assessment . .. ..... ...... .. .. . . 56-3 56.2.4 Detailed Screening Assessment .... . ...... ...... . . 56-4 56.2.5 Identification of Flood-Induced Initiating Events . . .. . . 56-6 56.2.6 Initiating Event Frequencies ....... ... . . ... . . . . 56-7 56.3 Assumptions . . . . . . . . . . . .......... . ......... . ... . . . . . . 56-7 56.3.1 General Flooding Analysis Assumptions and Engineering Judgments . 56-7 56.3.2 AP600-Specific Assumptions . . .... .... . ....... . . . 56-9 56.4 Information Collection . . . . . . . . . ...... .. ........... .. . .. 56-11 56.4.1 PRA-Modeled Equipment and Locations . . . . . . . . .... . . 56-11 56.4.2 Identification of Areas for Flooding Evaluation . .. . . . . . 56-11 36.5 At-Power Operations . . . . . .................... . . . . . . . . . . . 56- 12 56.5.1 Initial Screening Assessment . . . .... . ..... .. ... . 56-12 56.5.2 Detailed Screening Assessment ............ ..... . . 56-12 56.5.3 Identification of Flood-Induced Initiating Events ...... . . . . 56-28 56.5.4 Calculation of Flood-Induced Initiating Event Fr.quencies . . . . 56-32 56.5.5 Quantification of At-Power Flood-Induced Events . .. .. .... 56-39 i'3 V

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Section Title .P_ age 56.6 Shutdown Operations . . . . . . . . . ..... ... .. ... .... .... .. 56-41 56.6.1 Detailed Screening Assessment ............ ........... . 56-41 56.6.2 Identification of Flood-Induced Initiating Events . ...... .. .. 56-42 56.6.3 Calculation of Flood. Induced Initiating Event Frequencies . . . . . . . . 56-43 56.6.4 Shutdown Quantification . . . . . . . ... . .... ...... . . . . 56-48 56.7 Seismically Induced Flooding . .... ..... ..... . . . . . . . . . . . . . . . 5 6-51 56.8 Flooding Hazards During Refueling Outages . . . . . . . . ...... ........ 56-52 56.9 Flooding Sensitivity Study .................... .. . .. . . . . . . . 56-52 56.9.1 Flooding Human Error Probabilities Sensitivity Study . . . . . . . . . . . 56-52 56.10 Summary of Findings . . . . . . . . ............ ................ . 56-53 CHAPTER 57 INTERNAL FIRE ANALYSIS 57.1 Introduction ..... .................... . .. ...... ... . 57-1 57.2 Qualitative Analysis Methodology ...... ... . . ... .. ..... 57-2 57.3 Quantitative Methodology of Fire Area Frequency . . . . ... ...... ..... 57-6 57.3.1 Fire Frequency Calculations .......... . ........... . 57 6 57.3.2 Fire Damage Category Quantification . . . . . . . . . . . . . . . . . . . . . . 57-7 57.4 Core Damage Quantification Methodology ..... .. .. ....... . . . . 57-10 57.5 Fire Analysis Assumptions . . . . . . . . . . . . ............ .......... 57-12 57.5.1 Qualitative Analysis Assumptions and Other Modeling Considerations . . . . . . . .. ...................... . . . . 57-12 57.5.2 Quantification Assumptions And Modeling Considerations .... . . 57-14 57.6 At-Power Qualitative Analysis Results . . . . . . . . . . . . . . . . .. ... .. . 57-17 57.7 At-Power Quantitative Results . ... ........... .. ........... 57-19 57.7.1 Fire Ignition Frequencies for Quantitative Analysis . . . . ... ... . 57-19 57.7.2 Fire Damage Category Quantification . . . . . . .. ....... .. . 57-19 57.7.3 Individual Area PRA Analysis . . . . . . . . . . . . . ....... .... . 57-19 57.8 Control Room Fire Analysis - Power Operation . . . . . . . . . . ...... .. . 57-22 57.8.1 Description of the Control Room and Associated Fire Protection . . . 57-22 57.8.2 Alternate Shutdown Capability . . . . . . . . . . . . . . ............ 57-23 57.8.3 Fire Hazard Review . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . 5 7-2 4 57.8.4 AP600 Control Room Fire Evaluation . . . . . . . .............. 57-25 l 57.8.5 Fire Scenario Identification and Frequency Detennination . . . .. 57-29 57.8.6 Control Room Fire Scenario Quantification and Results ... ... 57-32 57.9' Shutdown Fire Analysis . ..... .............. . ..... . ... 57-33 57.9.1 Fire Ignition Frequencies during Shutdown Modes of Operation . .. 57-33 )

57.9.2 Fire Damage Category Quantification . . .. ... ........... 57-34 57.9.3 Individual Area PRA Analysis . . . . . . .... .. ............ 57-34 l 57.9.4 Fire Analysis for Safe Shutdown . . . . . . . ........... .. 57-34 57.9.5 Fire Analysis for Mid-Loop Operation . . . . . . . . . . . . . . 5 7-41 O

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Section Title P_aage 57.10 Summary and Conclusions . .. . ..... .. ... .. . . .... . 57-42 57.10.1 At-Power Analysis ........ . ... ....... . . 57-42 57.10.2 Shutdown Fire Analysis . . . . . . . . . . . . .. .. ... . . . 57-45 57.10.3 Conclusions . . . . . ........... ............... .... 57-47 57.11 References ........... . .... .......... .... .. .. . .. 57-48 ATTACHMENT 57A DEFINITIONS . . . .......... . ............. .. 57A-1 ATTACHMENT 57B DESIGN CHANGE EFFECT ON INTERNAL FIRE ANALYSIS . 57B-1 CHAPIER 58 WINDS, FLOODS, AND OTHER EXTERNAL EVENTS 58.1 Introduction . . ... .. ...... ...... ..... ........... . 58-1 58.2 External Events Analysis .. ... ....... ....,..... .........58-1 58.2.1 Severe Winds and Tornadoes . . . . ...... .. .. . . . . . 5 8- 1 58.2.2 External Floods . . . ........ ..... ......... . ..... . 58-2 58.2.3 Transportation and Nearby Facility Accidents . ...... .. .. .. 58-2 58.3 Conclusion ... .. ...... ........... .. .. ........... 58-3 58.4 References ... . .. .... ..... .. . .. .. ..... ....... 58-3 o CHAPTEP,59 PRA RESULTS AND INSIGHTS V) 59.1 Introduction ...... ................. ................ .. .59-1 59.2 Use of PRA in the Design Process . . . . . . . . . . . . . . . ..... . . .... 59-3 59.2.1 Stage 1 - Use of PRA During the Early Design Stage . . . . . . . . . . . 59-4 59.2.2 Stage 2 - Preliminary PRA . . . . . . . . . . . .. . ... ....... . 59-5 59.2.3 Stage 3 - AP600 PRA Submittal to NRC (1992) . . . . . . ...... . 59-7 59.2.4 Stage 4 - PRA Revision 1 (1994) . . . . . . . . . ......... .. .. 59-8 59.2.5 Stage 5 - PRA Revisions 2-8 (1995-1996) . . . . . . . . . . .. ..... 59-8 59.3 Core Damage Frequency from Intemal Initiating Events at Power ... .. .. 59-10 59.3.1 Dominant Core Damage Sequences . . . . . . . . . . . ...... . 59-12 59.3.2 Component Importances for At-Power Core Damage Frequency . 59-44 59.3.3 System Importances for At-Power Core Damage . .... . . . . . . . 5 9-44 59.3.4 System Failure Probabilities for At-Power Core Damage . . . ... 59-45 59.3.5 Common Cause Failure Importances for At-Power Core Damage . 59-45 59.3.6 Human Error Importances for At-Power Core Damage . . .. . . . . 59-45 59.3.7 Accident Class Importances . ....................... .. 59-47 59.3.8 Sensitivity Analyses Summary for At-Power Core Damage . ... 59-47 59.3.9 Summary of Important Level 1 At-Power Results . . . ...... .. 59-48 59.4 Large Release Frequency for Intemal Initiating Events at Power . . . .... 59-51 59.4.1 Dominant Large Release Frequency Sequences . ... . . ... . 59-52 59.4.2 Sensitivity Analyses for Containment Response . . . . . . . . . .. . 59-72 i

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Section Title Eage i

i 59.4.3 Comparison of Initiating Event Importances for Core Damage Fmquency and Large Release Frequency . . . . . . . . . .... .. . 59-72 59.4.4 Summary of Imponant Level 2 At-Power Results . . . . . . . . . . 5 9-73 59.5 Core Damage and Severe Release Frequency from Events at Shutdown . .. . .... .... .......... ..... . .. . . 59-75 59.5.1 Summary of Shutdown Level 1 Results . . . .. . ....... .. 59-75 59.5.2 Large Release Frequency for Shutdown and Low-Power Events . ......... .. ... ..... .. ... .... . . . 59-81 59.5.3 Shutdown Results Summary . . . . . . . ... . .. . . . . . . . . 5 9-82 59.6 Results from Intemal Flooding, Internal Fire, and Seismic Margin Analyses . . . . . . ...... ..... .. ........ . . . . . . . . . 5 9-82 59.6.1 Results of Internal Flooding Assessment . . . . . . . . .. . . . 59-82 59.6.2 Results ofIntemal Fire Assessment .... ... .. . .. . 59-83 59.6.3 Results of Seismic Margin Analysis . . . . ..... . . . . . . . 5 9-87 59.7 Plant Dose Risk from Release of Fission Products . . .. ..... .. .... 59-87 59.8 Overall Plant Risk Results . . . . ... . ..... ... . .. .. . 59-88 59.9 Plant Features Imponant to Reducing Risk . . . . . . . . . . . .. ... 59-89 59.9.1 Reactor Design ... .. . .. ..... ..... . . . . . . 59-90 59.9.2 Systems Design .. . . . . ..... ... . .. ...... 59-91 59.9.3 Instrumentation and Control Design . . . . . .. .. .. 59-94 59.9.4 Plant Layout . . ....... ... .... ... ... . .. . . . 59-95 59.9 5 Plant Structures . . . .... . ....... . . .. .. . ... 59-96 59.9.6 Containment Design . . . . .. ...... ......... .. 59-96 59.10 PRA Input to the Design Certification Process . . . . . ...... .. . ... .59-101 59.10.1 FRA Input to Reliability Assurance Program . . . . . . . . . . . . . . . 59 102 59.10.2 PRA Input to Certified Design Material .. . .. ...... . . . .59-102 59.10.3 PRA Input to the Technical Specifications . . . . .... . . . . . .59-102 59.10.4 PRA Input to MMI/ Human Factors / Emergency Response Guidelines . . . . .... ... ........... .. . . . . . . .59-102 59.10.5 Summary of PRA-Based Insights . . . . . . . . . . . . .. .59-103 59.10.6 Combined License Information ...... .. .. .. ... ...59-103 APPENDIX A MAAP4 ANALYSIS TO SUPPORT SUCCESS CRITERIA . . . ..... . . A-1 APPENDIX B EX-VESSEL SEVERE ACCIDENT PHENOMENA .. . .. . . . . . . . . . . B- 1 APPENDIX C DESIGN CHANGES THAT OCCURRED AFTER THE PRA ANALYSES WERE COMPLETED . ...... . ....... .. ... .. ..... C-1 APPENDIX D EQUIPMENT SURVIVABILITY ASSESSMENT . . . . ... . .. . . . . . D- 1 9

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b LIST OF TABLES Table No. Title Eage 2-1 Intemal Initiating Event Grouping - Plant Systems and Equipment Available for Transient / Accident Conditions . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 2-2 NUREG/CR-3862 Initiator Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48 2-3 NUREG/CR-3862 Initiator Categories Not Considered in the AP600 PRA Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52 2-4 AP600 Intemal Initiating Event Frequencies .........................2-53 2-5 Initiating Event Frequencies Used in Event Tree Quantification . . . . . . . . . . . . 2-56 2A.1-1 Summary of Primary System Piping Data . . . . . . . . . . . . . . . . . . . . . . . . . . 2A-1 2A.1-2 Summary of Primary System Pipe Break Frequency Quantification and Frequency Apportionments . . . . . . . . . . . . . .......... 2A-4 2A.1-3 Attribution of Line Break Frequencies to Specific LOCA Initiating Event Categories . . . . . . . . . . .............. . . . . . . . . . . . . . . . . . 2A- 5 2A.2-1 RCS Leakage Events . . . . . . . . . . . ................. ........... 2A-7 2A.3-1 Summary of Steam Generator Tube Rupture Events . . . . . . . . . . . . . . . . . . . 2A-18 2A.4-1 Identification of the Situations Potentially Leading to LOCA and Interfacing LOCA on RNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2A-20

,m 2A.4-2 Screening Quantification of LOCA and Interfacing LOCA Frequencies (v ) on Normal RHR System . . . . . . . . . . . . . . .......... ............ 2A-23 2A.4-3 Summary of Screening Quantification of LOCA and Interfacing LOCA Frequencies on RNS . . . . . . . ............... .......... ...... 2A-28 2A.51 Spurious Stuck-open Pressurizer Safety Valve .................. .. 2A-29 2A.5-2 Interface Break on Accumulator Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2A-30 2A.5-3 Interface Break on IRWST Injection Lines . . . . . . . . . . . . . . . . . . . . . . . . . 2A-32 2A.6-1 Summary of Main Steam Line and Feedwater Line Piping Data for Secondary-side Break Frequency Quantification . . . . . . . . . . . . . . . . ... 2A-35 2A.6-2 Secondary-side Line Break Frequency Quantification . . . . . . . . . . . . . . . . . . 2A-36 2A.6-3 Stuck-open Main Steam Line Safety Valve Frequency Quantification . . . . . . . 2A-37 2A.71 Initiating Events Review Data Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 2A-40 3-1 Loss of CCS/SWS Initiating Event Fault Tree CSWF Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 3-9 3-2 Spurious Actuation of Automatic Depressur zation Failure Criteria Summary . . . 3-10 3-3 Evaluation of Spurious Automatic Depressurization System Frequencies . . . . . 3-11 4-1 Summary of Systems Associated with Mitigating Functions for AP600 . . . . . . 4-115 4-2 Summary List of Event Tree Top Events ..........................4-116 4-3 Summary of Core Damage Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . 4- 1 19 i i V

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O Table NL Title P_ age 5-1 AP600 Safety-Related Plant Support Systems with Letter Designators . . . . . . . . . 5-3 5-2 AP600 Nonsafety-Related Plant Support Systems with Letter Designators . . . . . . 5-3 5-3 AP600 Support System Interdependency Matrix . . . . . ..... ........... 5-4 5-4 AP600 Safety-Related Front-Line Plant System Letter Designators . . . . . . . . . . 5-17 5-5 AP600 Nonsafety-Related Front-Line Plant System Letter Designators . . . ... 5-17 5-6 AP600 Front-Line System Dependency Matrix . . . . . . . . . . . . ...........5-18 6-1 Summary of Event Tree Top Events Success Criteria . . . . ........ ... . 6-102 6-2 Summary of Success Criteria for the Mitigating Systems . . . . ... . . . . . . . 6-130 6-3 Summary of Success Criteria for Operator Actions and Mission Times . . . . . 6-144 6-4 Deleted 7-1 Example for Fault Tree XXX Success Criteria Summary . . . . . . .. .. . . 7-16 7-2 Example for System Dependency Matrix . . . ........ .. ... .. . . 7-16 7-3 Example for Component Test Assumptions . . . . ............... .. 7-17 7-4 Example for Component Maintenance Assumptions . . . . . . . . . . ... . . . . . 7-17 7-5 Example for Operator Actions and Disposition Analysis Summary . . ... . . 7-17 7-6 Fault Tree Identification Codes ... ....... ................ . . . . . 7-18 7-7 System Identification Codes for Basic Events ... .... . .. ..... .. 7-21 7-8 Component Identification Codes .. . ... .. ................... . 7-24 7-9 Failure Mode Identification Codes . . . ............... .... ....... 7-31 8-1 List of System Fault Trees ............. .. ......... .... ..... 8-8 8-2a Fault Tree PRT Success Criteria Summary . . . .............. . .... 8-9 8-2b Fault Tree PRL Success Criteria Summary . . .............. . . ... 8-10 8-2c Fault Tree PRP Success Criteria Summary .. .. ..... . . . . . . . . . 8- 1 1 8-2d Fault Tree PRS Success Criteria Summary ........... .. .... . . . . . . 8- 12 8-2e Fault Tree PRW Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 13 8-2f Fault Tree PRI Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 8- 14 1 8-2g Fault Tree PRTA Success Criteria Summary .. .... ... .. ... . . . 8-15 l 8-3 Notes Related to System Fault Tree Assumptions . . . . . . . . . . . . . . . . . . . 8- 16 l

8-4 System Dependency Matrix . . . . . ....... . .... ..... . . . . . 8-17 '

8-5 Component Test Assumptions . . . . . . . . . . . .......... . ... .. . . 8-18 8-6 Component Maintenance Assumptions . . . . . . . . . ......... . . . . . 8-18 8-7 Operator Actions and Disposition Analysis Summary .. . .. .. 8-19 8-8 Common Cause Failure Analysis Summary . . . ............. . ... . . 8-19 f 8-9 Fault Tree Basic Events for Passive Residual Heat Removal System . . . ..... 8-20 l 1

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Table No. Title P_ age 9-1 List of System Fault Trees .. .. ........ ..................... 9-9 9-2a Fault Tree CM2AB Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . 9-10 9-2b Fault Tree CM2SL Success Criteria Summary . ................. . . . 9-11 9-2c Fault Tree CM2L Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . 9-12 9-2d Fault Tree CM2P Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . 9-13 9-2e Fault Tree CM1 A Success Criteria Summary . . . . . . . ............... . 9-14 l 9-2f Fault Tree CM2LLT Success Criteria Summary . . . . ... ... . . . . . . . . . . 9- 15

{

9-2g Fault Tree CMBOTH Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 9-16 i 9-2h Fault Tree CM2LA Success Criteria Summary . . ............. . ..... 9-17 9-2i Fault Tree CM2NL Success Criteria Summary . . . . . . . . . . ........ .. . 9-18 9-3 Notes Related to System Fault Tree Assumptions . . ............. . .. . 9-19 9-4 System Dependency Matrix . . . . . . . 9-19

)

9-5 Component Test Assumptions . . .......... . . . . . . . . . . . . . . . . . . . . . 9-2 0 l 9-6 Component Maintenance Assumptions . . . . . ...... .... ....... .. 9-20 i 9-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . ...... 9-21 9-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . ...... ... 9-21 9-9 Fault Tree Basic Events for Core Makeup Tank Subsystem ........ ..... 9-22

/m List of System Fault Trees . . 10-6 V) 10-1 10-2a Fault Tree AC2AB Success Criteria Summary

.......................10-7 10-2b Fault Tree ACI A Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . 10-8 10-2c Fault Tree ACBOTH Success Criteria Summary ............. .. . . 10-9 10-3 Notes Related to System Fault Tree Assumptions . . . .... ......... . . 10-10 10-4 System Dependency Matrix . . . ...... ......... ......... . . . . 10-10 10-5 Component Test Assumptions . . . . . . . ............. . . . . . . . . . . . . 10- 10 104$ Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11 10-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . 10- 1 1 10-8 Common Cause Failure Analysis Summary . . . . . . . . . . . .......... . 10-11 10-9 Fault Tree Basic Events for Accumulator Subsystem .. ............ . 10-12 Il-la List of System Fault Trees . . . . . . . . . . . . . . ..... ......... . .. .11-9 11-1b List of System Fault Trees (For Plant Damage States Analysis) . . ... ................ . . . 11-10 11-2a Automatic Depressurization System Success Criteria Versus Accident Conditions Full Depressurization . . . . .... ... .. . . . . I1-11 11-2b Automatic Depressurization System Success Criteria Versus Accident Conditions Partial Depressurization ............................. . 11-12 11-2c Automatic Depressurization System Fault Tree Summary (For Plant Damage States Analysis) . .... .................... .. 11-13 11-2d Fault Tree ADA Success Criteria .... ... ...... ............. . 11-13 11-2e Fault Tree ADT Success Criteria . . . . . .... . .. .. . ....... .. . 11-14 m

Revision: 9

[ Westinghouse ENEL mh% April 11,1997 xlj o$ap600pra\rev_9\pra-lot.wpf.lb E-------_______________________._______-- - - - _ _ _ _ _ _ _

M LIST OF TABLES (Cont.)

e Table No. Title Eage 11-2f Fault Tree ADI A Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . ..... 11-14 Il-2g Fault Tree ADI Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15 11-2h Fault Tree ADS Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16 11-2i Fault Tree ADU Success Criteda . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . 11-17 11-2j Fault Tree ADV Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18 11-2k Fault Tree ADZ Success Criteria . . . . . .................. ... ... 11-18 1 2-21 Fault Tree ADM Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19 11-2m Fault Tree ADQ Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19 11-2n Fault Tree ADAL Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20 11-20 Fault Tree ADL Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21 11-2p Fault Tree ADRA Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21 11-2q Fault Tree ADR Success Criteria . . . . . . . . . . ..................... 11-22 11-2r Fault Tree ADAB Success Criteria ...... .......... ......... . 11-23 11-2s Fault Tree ADB Success Criteria . .............................. 11-23 11-2t Fault Tree ADW Success Criteria . . . . . . . . ......... . . . . . . . . . . . . . 1 1 24 11-2u Fault Tree ADUM Success Criteria . . . . . . . . . . ...... ........... Il-24 11-2v Fault Tree ADF Success Criteria . . ................... .......... Il-25 11-2w Fau!r Tree ADMA Success Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1-25 11-2x Fault Tree ADTLT Data Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26 11-2y Fault Tree ADQLT Success Criteria . . . . . . . . . . . . . . . . . . ........... 11-26 11-3 Notes Related to System Fault Tree Assumptions . . . . . . . . . . . . . . . . . . . . . 11-27 11-4 System Dependency Matrix . . . . . . ................. ...... .... 11-28 11-5 Component Test Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 11-29 11-6 Component Mainten .nce Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-29 11-7 Operator Actions and Disposition Analysis Summary . . .......... . . . . 11-30 11-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . . 11-31 11-9 Fault Tree Basic Events for Automatic Depressurization System . . . . . . . . . . 1 1 -3 2 12-1 List of System Fault Trees . ,, . . . . . .............. . ... . . . . . . 12-11 12-2a Fault Tree IW2AB Success Criteria Summary ......................12-12 12-2b Fault Tree IW2ABM Success Criteria Summary ............. . . . . . . 12-13 12-2c Fault Tree IW2ABA Success Criteria Summary .. .... .. . . . . 12-14 12-2d Fault Tree IW2ABP Success Criteria Summary .....................12-15 12-2e Fault Tree IW2 BPM Success Criteria Summary ......... . . . . . . . . . . . 12- 16 12-2f Fault Tree IW2ABB Success Criteria Summary ............. ... . . . 12-17 12-2g Fault Tree IW2ABBM Success Criteria Summary ........ ...... . . . . 12-18 12-2h Fault Tree IW1 A Success Criteria Summary ............... . . . . . . . 12-19 12-2i Fault Tree IW1AM Success Criteria Summary ............. . . . . . . . . 12-20 12-2j Fault Tree IWF Success Criteria Sumt.tary . . . . . . . . . . . . . . . . . . ...... 12-21 12-2k Fault Tree RECIRC Success Criteria Summary . . . . . . . . . . . . . . . . ..... 12-22 e

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V LIST OF TABLES (Cont.) f Table No. Title Page 1 2-21 Fault Tree RECIRP Success Criteria Summary ...................... 12-23 12-2m Fault Tree RECIRB Success Critena Summary .... ................ 12-24 12-2n Fault Tree RECIRA Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 12-25 12-2o Fault Tree RECIRAP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . 12-26 12-3 Notes Related to System Fault Tree Assumptions .................... 12-27 12-4 System Dependency Matnx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-27 j 12-5 Component Test Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-28 12-6 Component Maintenance Assumptions . . . . . . . . . . . . . . .......... .. 12-29 12-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . 12-29 12-8 Common Cause Failure Analysis Summary . . . ................... . 12-30 12-9 Fault Tree Basic Events for IRWST Subsystem . . . . . . . . . . . . . . . ...... 12-31 13-1 List of Sy stem Fault Trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... 13-8 13-2 Fault Tree PCT Success Criteria Summary . . . . . . . ............... .. 13-8 ,

13-3 Notes Related to System Fault Tree Assumptions ..................... 13-8 l 13-4 System Dependency Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-9 )

13-5 Component Test Assumptions . . ............................. .. 13-9 f3 13-6 Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-10 13-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . 13-10 13-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . . 13-10 13-9 Fault Tree Basic Events for Passive Containment Cooling System . . . . . . . . . 13-11 14-1 List of System Fault Trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-9 14-2a Fault Tree FWT Success Criteria Summary ................. . . . . . . 14-10 14-2b Fault Tree FWF Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . 14-11 14 2c Fault Trie SFWT Success Criteria Summar; . . . . . . . . . . . . . . . . . . . . . . . . 14-12 14-2d Fault Tree SFW Success Criteria Summary . . . . . .... .. ......... . 14-13 14-2e Fault Tree SFW1 Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . 14-14 14-2f Fault Tree SFWP Success Criteria Summary . . . . . ....... . . . . . . . . . . 14- 15 14-2g Fault Tree SFWM Success Criteria Summary .. ...... ..... ... . . . 14-16

, 14-2h Fault Tree SFWA Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . 14-17 14-2i Fault Tree COND Success Criteria Summary . . . . . . . . . . . . ............ 14-18 l 14-2j Fault Tree CONDI Success Criteria Summary . . ............... . . . . 14-19 14-2k Fault Tree CDS Success Criteria Summary . . . . . . . . . . . . . . . . . . . ... . 14-20 1 4-21 Fault Tree TCCW Success Criteria Summary . . . . . . . . . . . . . ... .... . 14-21 14-3 Notes Related to System Fault Tree Assumptions . . ............ . . . . . 14-22 l 14-4 System Dependency Matrix . . . . . . . . . . . . . . . . . . . . . . . . . .... . ... 14-23 l 14-5 Component Test Assumptions . . . . . . . . . . . , . . . . . . . . . ............. 14-31 l 14-6 Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 14- 3 2 14-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . 14-32 1

Revision: 9 W Westingholise $Eh April 11,1997 xliii OM PM P*ev.9Wlampf:lb I

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LIST OF TABLES (Cont.)

Table No, Title Pag _e 14-8 Common Cause Failure Analysis Summary . . . . . . . . . . .... ......... 14-33 14-9 Fault Tree Basic Events for Main and Startup Feedwater System . . . . . . . . . . 14-34 15-1 List of System Fault Trees . . . . . . . . . . . . . . . . . . . ... . ........ .. 15-9 15-2a Fault Tree CSBORI Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . 15-10 15-2b Fault Tree CVS1 Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . 15-11 15-2c Fault Tree CSAX Success Criteria Summary . . . . . . . . . . . . . .... . . . . . 15-12 15-2d Fault Tree SGHL Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 15- 13 15-2e Fault Tree CSP Success Criteria Summary ......... . . . . . . . . . . . . . . . 15- 14 15-3 Notes Related to System Fault Tree Assumptions . . ...... ....... ... 15-15 15-4 System Dependency Matrix . . . ............. ......... . . . . . . -. 15-16 15-5 Component Test Assumptions .......... .. ....... . . . . . . . . 15-17 15-6 Component Maintenance Assumptions . .........................15-18 15-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . 15-19 15-8 Common Cause Failure Analysis Summary . . . . . . . . .............. . 15-20 15-9 Fault Tree Basic Events for Chemict.1 and Volume Control System . . . . . . . 15 21 16-1 List of System Fault Trees . . . ....... ........... .... . . . . . . . 16-5 16-2 Fault Tree VLH Success Criteria Summary . . . . . . ............. . . . . . 16-5 16-3 Notes Related to System Fault Tree Assumptions . . . .................. 16-5 16-4 System Dependency Matrix . . . . . . .................... . . . . . . . . . 16-6 16-5 Component Test Assumptions . . . . . . . ........... . . . . . . . . . 16-6 16-6 Componem Maintenance Assumptions ...... . . . . . . . . . . . . . . . . . . . . . 1 6-6 16-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . 16-7 16-8 Common Cause Failure Analysis Summny . . . . . . . . . . . . . .. . . . . ... . 16-7 16-9 Fault Tree Basic Events for Containment Hydrogen Control System . . . . . . . . . 16-8 17-1 List of System Fault Trees . ...... .......... .. ............ . 17-8 17-2a Fault Tree RNR Success Criterin Summary . . . . . . . . ........... ..... 17-9 17-2b Fault Tree RNP Success Criteria Summary . . . . . . . . .......... . ..... 17-9 17-3 Notes Related to System Fault Tree Assumptions . . . ....... . . . . . . . 17-10 17-4 System Dependencies Matrix . . . . . ....... ........... . . . . . . . 17-11 17-5 Component Test Assumptions . . . . ......... ..... .. . . . . . . 17-12 17-6 Component Maintenance Assumptions . ......... ... . . . . . . . . 17-12 17-7 Operator Actions and Disposition Analysis Summary . .. ....... ... . 17-13 17-8 Common Cause Failure Summary ... .. ........... ... . . .. . 17-13 17-9 Fault Tree Basic Events for Normal Residual Heat Removal System . . . . .. . 17-14  !

Revision: 9 O

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(n V)

LIST OF TABLES (Cont.)

Table No. Title Page 18-1 List of System Fault Trees ........... . .................... .. 18-6 18-2a Fault Tree CCN Success Criterie Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 18-6 18-2b Fault Tree CCT Success Criteria Summary ........ ................. I8-7 18 2c Fault Tree CCP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . I8-7 j 18-3 Notes Related to System Fault Tree Assumptions . . . . . . . . . . ....... .. .18-8 18-4 System Dependency Matrix . . . . . . . . . . . . . ........................I8-8 18-5 Component Test Assumptions . . . . . . . . . . . . . . . ...............I8-9 )

18-6 Component Maintenance Assumptions . . . . . . . . . . ...... ......... ..I8-9 i 18-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . . I8-10 18-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . . I 8- 10 18-9 Fault Tree Basic Events for Component Cooling Water System . . . . . . . . . . . 18-11 19-1 List of System Fault Trees ..................................... 19-6 19-2a Fault Tree SWN Success Criteria Summary . . .. ....... .......... 19-6 1 19-2b Fault Tree SWT Success Criteria Summary . . . ......................19-7 l 19-2c Fault Tree SWP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . ... 19-7 I 19-3 Notes Related to System Fault Tree Assumptions .. .......... .... .19-8 19-4 System Dependency Matrix . . . . . . . . . . . . . . . . . . . . . .......... ... 19-9 19-5 Component Test Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. 19-10 (S'} 19-6 Component Maintenance Assumptions . . . . . . . , , . . . . . . . . . . . . . . . . . . . 19-10 19-7 Operator Actions and Disposition Analysis Summary ................. 19-11 19-8 Common Cause Failure Analysis Summary . . ...................... 19-11 19-9 Fault Tree Basic Events for Service Water System . . . . . . . . . . . . . . . . . . . 19-12 20-1 List of System Fault Trees ...... .............. ............... 20-6 20-2 Fault Tree VWH Success Criteria Summary .... ........ ..... . . 20-6 20-3 Notes Rels.ted to System Fault Tree Assumptions ....... ... ....... .20-6 20-4 System Dependency Matrix . .. ........................... . . 20-7 20-5 Component Test Assumptions . . . . . . . . . . . ........ .. .. ....... . 20-8 20-6 Component Maintenance Assumptions .. .......... .......... .. . 20-8 20-7 Operator Actions and Disposition Analysis Summary . . . . . . . . ........ . 20-9 20-8 Common Cause Failure Anslysis Summary ......... ...... ........ 20-9 20-9 Fault Tree Basic Events for Central Chilled Water System ....... . . . . 20-10 21-1 List of System Fault Trees . . . ........ .... ...... ...... . 21-10 21-2 Fault Tree Success Criteria Summary . . . . ................... . .. 21-13 l

21-3 Nou:s Related to System Fault Tree Assumptions ................ . . . 21-29 l 21-4 System Dependency Matrix . . . . . . . . . . . . . . . . ................... 21-32 21-5 Component Test Assumptions . ......... ............... ... . 21-32 o\

(d Revision: 9 l T Westinghouse fh_ xlv c:\ap600\pra\rev.9\pra-ktwpf.lb April 11,1997

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C EE 1

LIST OF TABLES (Cont.)

O Title Ea.ge Table No.

Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . ......

. 21-33 21-6 21-7 Operator Actions and Disposition Analysis Summary . . . .............. 21-33 Common Cause Failure Analysis Summary ....... ..... . ........ 21-33 21-8 Fault Tree Basic Events for AC Power System ..... .... ........... 21-34 21-9 List of System Fault Trees ...... .... ............ ............ 22-6 22-1 22-2 Fault Tree Success Criteria Summary . ........ ...... ...... . . . . 22-10 22-3 Notes Related to System Fault Tree Assumptions . . . . . . .............. 22-26 22-4 Systems Dependercy Matrix . . . . . . . . . . . . . . . . . . ..... ....... .. 22-26 22-5 Component Test Assumptions . . . ................ .... ....... 22-27 Component Maintenance Assumptions . . . . . . . . ..... ....... ..... 22-27 22-6 Operator Actions and Disposition Analysis Summary . . . ... ... ..... 22-27 22-7 Common Cause Faibre Analysis Summary ... ............. . ... 22-28 22-8 22-9 Fault Tree Basic Events for Class IE de and Uninterruptible Power Supply System .............. ................ ............ 22-29 22-10 System Power Requirements / Dependencies . ............ . . . . . . . . . 22-41 23-1 List of System Fault Trees . . . . . ... .. ...... . ............... 23-6 _

23-2 Fault Tree Success Criteria Summary . . . . . . . . . . . . . . . . . ... .. .... . 23-9 23-3 Notes Related to System Fault Tree Assumptions . . . . . . . . . . . . . . . . . . . . 23-20 23-4 System Dependency Matrix . . . . ....... . ................ .... 23-20 23-5 Component Test Assumptions . . . . . . .................... ...... 23-21 23-6 Component Maintenance Assumptions . . . . . . . . ... .............. 23-21 23-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . 23-21 23-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . .. .... 23-22 23-9 Fault Tree Basic Events for Non-Class 1E de and UPS System . . .... ... 23-23 24-1 AP600 Containment Penetration List ......... .. ....... .. ..... 24-7 24-2 Screening Analysis Evaluation . . . . . . . . . . . . .... .... .... . .. . 24-16 24-3 Containment Penetrations Not Screened Out for Normal Operation at Power Analysis . . . . . . . . . . . . . . . . . . .......... ........... 24-22 24-4 List of System Fault Trees ...... .... ..... . .. ..... ...... . 24-22 24-5a Fanit Tree CIC Success Criteria Summay ...... . ........... .. . 24-23 24-5b Fault Tree CIA Success Criteria Summary . . . .... ........... ..... 24-23 24-Sc Fault Tree CIB Success Criteria Summary . . . . .......... .......... 24-24 24-6 Notes Related to System Fault Trees Assumptions . . . . ..... ....... 24-24 24-7 System Dependency Matrix . . . . . . ................. ..... .. . 24-25 {

.... 24-28 j 24-8 Component Test Assumptions . . . . . . .. ...... ...... .. ..

24-9 Component Maintenance Assumptions . . . .. ... ............. .. 24-28 Revision: 9 O.l April 11,1997 c:\ap600pu\rev.9\pra-lot.wpf.lb xlvi h_ T Westinghouse l

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'O LIST OF TABLES (Cont.)

Table No. Title P. age 24-10 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . . . . . . . . 24 29 24-11 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . . 24-29 24-12 Fault Tree Basic Events for Containment Isolation System . . . . . . . . . . . . . . 24-30 25-1 List of System Fault Trees ................. ................... 25-9 25-2a Fault Tree CAIAIR Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 25 - 10 25-2b Fault Tree CAIR Success Criteria Summary .......... . . . . . . . . . . . . . 25- 10 25-2c Fault Tree CAIAIRP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 25-11 25-2d Fault Tree ENDCAIAI Success Criteria Summary . . . . . . . . . . . . . . . . . . . . 25-11 25-2e Fault Tree ENDCAIAP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . 2512 25-2f Fault Tree CASF Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . 25-13 25-3 Notes Related to System Fault Tree Assumptions . . . . . . . . . . . . . . . . . . . . . 25-13 25-4 System Dependency Matrix . . . . . . . . . . . ........ . . . . . . . . . . . . . . . 25 - 14 25-5 Component Test Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-14 25-6 Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-15 25-7 Operator Actions and Disposition Analysis Summary . . . . . . . . . . . .. .. 25-15 25-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . 25-15 l

25-9 Fault Tree Basic Events for Instrument Air Subsystem . . . . . . . . . . . . . . . . . 25-16 26-1 List of System Fault Trees . . . . . . ..............................26-28 26-2a Fault Tree RTPMS and RTPMS1 Success Criteria Summary . . . . . . . . . . . . . 26-29 l 26-2b Fault Tree RTSTP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 26-29 26-2c Fault Tree RCL Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . 26-30 26-2d.1 Fault Tree RCT Success Criteria Summary . . . . . . . . . . . ... . . . . . . . . . 26-30 26-2d.2 Fault Tree RCN Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . 26-31 26-2e I&C Subtree Success Criteria Summary .......... . .............. 26-32 26-3a PMS I&C Subtree Constmetions . . . . . . . . . . . . . . . . . . . . . . . . . . . ...26-130 26-3b Representative PMS I&C Subtree Plot Listing . . . . . . . . . . . . . . . . . . . . .26-149 26-4 PMS Dependency Matrix . . ................... ........ . . . .26-163 26-5 PMS Components Test Assumptions ....................... ... 26 166 26-6 Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . .26-166 26-7 Failure Probabilities Calculated in this Section . . . ........ ..... ...26-167 26-8 Operator Actions and System Disposition Analysis Summary . . . . . . . ...26-172 l 26-9 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . .....26-175

!26-10a Fault Tree Basic Events for Reactor Trip System . . . . . . . . ....... ..26-177 26-10b Fault Tree Basic Events for the I&C Subsystem . . . . . . . . . . . . . . . . . . . . .26-181 26-11 Assumed List of I&C Instrumentation . . . . . . . . . . . . . . . . . . . . . . . ... .26-230 l

27 1 List of System Fault Trees . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . 2 7-9 27-2a Fault Tree DAS Success Criteria Summary . . . . . . . . . . . . . . . . ......... 27-9 27-2b Fault Tree DASI Success Criteria Summary . . . . ... ........... .... 27-9 C

Revision: 9 ENEL T Westinghouse cah. April 11,1997 xlvii oVW*n_%I1*P :Ib f

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M.

LIST OF TABLES (Cont.)

O 1 Table No. Title Page 27-3 Notes Related to System Fault Tree Assumptions .............. . . . . . 27-10 27-4 System Dependency Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-10 27-5 Component Test Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 27-10 27-6 Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-10 27-7 Operator Actions and System Disposition Analysis Summary . . . . . . . . . . . 27-10 27-8 Common Cause Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . . 27-11 27-9 Fault Tree Basic Events for Diverse Actuation System . . . . . . . . . . . . . . . . . 27-12 28-1 List of System Fault Trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-23 28-2 Fault Tree Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-24 28-3a PLS 1&C Subtree Constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-46 28-3b Representative PLS 1&C Subtree Plot Listing . . . . . . . . . . . . . . . . . . . . . . . 28-55 28-4 PLS Dependency Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-66 28-5 PLS Components Test Assumptions . . . . . . . . . . . . . . . . . . . . . . . ...... 28-68 28-6 Component Maintenance Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-69 28-7 Failure Probabilities Calculated in this Section . . . . . . . . . . . . . . . . . . . . . . 28-70 28-8 Operator Actions and System Disposition Analysis Summary . . . . . . . . . . . . 28-73 28-9 Common Cau:e Failure Analysis Summary . . . . . . . . . . . . . . . . . . . . . . . . . 28-75 28-10 Fault Tree Basic Events for 1&C Subsystem . . . . . . . . . . . . . . . . . . . . . . . 2 8 -77 28-11 Assumed List of 1&C Instrumentation . ..........................28-136 28-12 Assignments of Plant Systems to Control Logic Cabinets ............ .28-139 28-13 Assignments of Plant Systems to the Control Gruup Cabinets . . . . . . . . . . .28-140 29-1 Electrical Components with Low Common Cause Failure Rate . . . . . . . . . . . 29-16 25 '. Common Cause Failure Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29- 17 30-1 AP600 Human Error Probability Summary Results . . . . . . . . . . . . . . . . . . . 30-79 30-2 Manual DAS Actuation .................................... . 30-95 30-3 Dependency Level Evaluation Summary . . ... .... .. ........ . . . 30-97 30-4 Dependency Level Evaluation .. ......... ............. . ...30-111 30-5 List of Acronyms . . . . . . . . . . . . . . . . . . . ........ ... . . . . . . . .30-114 31-1 Summary of Event Tree Scalar Probabilities . . . . . . . . .... .......... 31-15 31-2 UET Versus Cumulative Fraction of Transients in the UET Period (Transient Time) ..... ........... ... .......... .. ..... . 31-17 32-1 Generic Data B ase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-5 32-2 Test and Maintenance Outal,e Generic Data . ......... .. . . . . . . . . . 32-21 32-3 Test and Maintenance Unavailabilities Used in AP600 Core Damage Quantification . . . . . . . . . . . . .................... 32-22 Revision: 9 April 11,1997  % [ Westiligh0USB o$ap600hpra\rev 9\pra-lotspf;1b xlyjij

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l LIST OF TABLES (Cont.)

i Table No. Title Eage 32-4 Common Cause Factors . . . . . . . . . . . . . . . . ........ ........ . . 32-23 32 5 Master Data Bank (SIMON.OUT File) . . . . . .. . ... ...... . 32-29 33 1 Summary of AP600 System Fault Tree Failure Probabilities . . . . . . . ... .. 33 7 33-2 Example Accident Sequence Definitions for Large LOCA . . . . . . . . . . . . . . 3 3 19 33-3 List of Dominant Cutsets (At Power) . . . . . . ......... ....... . . . . 33-20 33 4 List of Dominant Sequences (At Power) . . . . . . . . .... ....... . . 33-29 33-5 Importance Calculations for Initiating Events . . . ..... .......... . . . 33-42 l

334) AP600 PRA List of Basic Event Descriptions . . . . . . . . . . . . ...... .. 33-43 34-1 Post-Accident Monitoring Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-30 ,

34-2 Level 1 Accident Class . . .................. ... . ...... ... 34 31 34 3 AP600 Level 1 Dominant Core Damage Sequences . . . . . . . . . . . . . . . . . 34-3 2 34-4 Summary of Release Categories .................................%38 34-5 3BE-1 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-3 9 34-6 3 BE-2 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 40 j

!\f 34-7 3BE 3 Event Summary . . . . . . . . . . . . . . . . . . ........... . . ....... 34-41 l l

34-8 3BE-4 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 42 34-9 Summary of Releasc Categories Considered for Accident Class 3BE . . . . . . . 34-43 34-10 Summary of Release Category Disposition for Accident Class 3BE . . . . . . . . 34 43

% 11 3 B E-5 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-44

% 12 3 B E-7 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-45 j

% 13 3 B E-8 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-46 W14 3BE-9 Event Summary . . . . . . ...............................34-47

% 15 3BE- 10 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-48 34-16 3 B L-1 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-49

%I7 3 B L-2 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . % 50 l 34-18 Summary of Release Categories C'onsidered for Accident Class 3BL ....... 34-51 Summary of Release Category Disposition for Accident Class 3BL ........ 34-51 34-19 34-20 3 BL-3 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-52 l 34-21 3BR-1 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %53 l 34-22 Summary of Release Category Disposition for Accident Class 3BR . . . . . . . . 34-54 i

% 23 3C-1 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-55

% 24 Summary of Release Category Disposition for Accident Class 3C ......... 34-56 l 34-25 3 D-1 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-57

'* 34 26 Summary of Release Categories Considered for Accident Class 3D . . . . . . . . 34 5 8

% 27 Summary of Release Category Disposition for Accident Class 3D ..........%58 34-28 3 D-2 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %59 6E- 1 Event S ummary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-60

) 34-29 6E 2 Event Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-61 j

/ % 30 I

34-31 6E 3 Event Summary .......................................34-62 Revision: 9 W W8Silligh0088 E..S-April 11,1997

l l

, e i l

LIST OF TABLES (Cont.)

Table No. Title Page  !

l 34-32 6L-1 Event Summary . ........ ........ ...... .. . . . . . . . 34 63 34-33 Summary of Release Categories Considered for Accident Class I AP . . ... 34-64 34-34 Summary of Release Category Disposition for Accident Class I AP . .. . 34-64 34-35 1 AP-1 Event Summary . . ........ ... ..................... 34-65 34-36 Summary of Release Categories Considered for Accident Class IA .... ... 34-66 4

34-37 Summary of Release Category Disposition for Accident Class 1 A ........ 34-66 34-38 1 A-1 Event Summary . . ................................ .. 34-67 35-1 Functional Definitions of Level 1 Accident Classes ........... ....... 35-22 35-2 CET Initial Conditions for Level 1 Accident Classes ............. . . . . 35-23 35-3 Containment Event Tree Nodal Questions . . . ........ .. . . . . . . . . . . 3 5-24 35-4 Summary of Release Category Definitions . . . . . ........ . . . . . . . . . . . 35-25 35-5 Summary of Containment Event Tree Success Criteria . . . ........... 35-26 35-6 Summary of Operator Actions Credited on Containment Event Tree . . .... 35-29 36-1 Summary Table for RCS Depressurization (CET Node DP) . . . . . . . . . . . . . . 36-7 j 37-1 Summary Table for Containment Isolation (CET Node IS) .......... .... 37-5 l 38-1 Summary Table for Reflooding (CET Node RFL) .............. ...... 38-6 39-1 Pressure Loading on Insulation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 9- 1 5 39-2 Summary Table for Reactor Cavity Flooding (CET NODE IR) . . . . . . . . . . . 39- 16 39-3 Summary Table for Debris Relocation to Cavity (CET NODE VF) . . . ..... 39-16 41-1 Containment Event Tree Nodal Failure Probabilities . . . . . . . . . . . . . . . . . . 41 -4 3 41-2 Summary of System Assumptions for MAAP4 Hydrogen Mixing Analyses . . . 41-44 41-3 Summary of Hydrogen Gene;ation Results MAAP4 Hydrogen Mixing Analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................... 41-51 41-4 Summary of Early Compartment Gas Composition Results for MAAP4 Hydrogen Mixing Analyses . . . . . . ..... ... ........ . . . . . . . . . . 41 -57 41-5 Summary of System Assumptions for MAAP4 Hydrogen Burning Analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ . . . . 41 -67 41-6 Summary of Hydrogen Generation Results for MAAP4 Hydrogen Buming Analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 -68 41-7 Summary of Early Compartment Gas Composition Results for MAAP4 Hydrogen Buming Analyses . . . . . . . ................... . . . . . . 41 -69 41-8 Geometric Classes for Flame Acceleration . ............. . . . . . . . . . . 41 -71 41-9 fammary of DDT Potential Evaluation from NUREG/CR-4803 . . . . . . . . . . 41-72 41-10a Dependence of Result Class on Mixture and Geometric Class . . . . . . . . . . . 41 -73 41-10b Classification of the Probability of Deflagration to-Detonation Transition . . . 41-73 l Revision: 10 ENEL l June 30,1997 :ng_ T Westirigholise obp600$rn\rev.10$ra-lot wpf.lb 1

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wJ l LIST OF TABLES (Cont) j I

Table No. Title P,_ age 41-11 AP600 Compartment Geometry Class Assignment for Sherman-Berman i Methodology for the Estimation of the Likelihood of Detonation . . . . . . . . . . 41-74 l 41-12 AP600 Scenario Dependencies for Early Detonation Analysis . . . . . . . . . . . . 41-75 1 41-13 Early Detonation Probability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 -7 6 )

41-14 Intermediate Time Frame Detonation Probability . . . . . . . . ............ 41-87 l 41-15 Safety Margin Basis Containment Performance Requirement . . . . ........ 41-90 l 1

4 42-1 Parameters Used in the Construction of the AP600 Containment i l

Failure Probability Distribution for Containment Temperature = 400*F . . . . . . . 42-9  !

40 " Parameters Used in the Construction of the AP600 Conditional Containment l Failure Probability Distribution for Containment Temperature = 331'F . . . . . . 42-10 42-3 Cumulative Containment Failure Probability, Temperature = 400'F . . . . . . . . 42-11 i 42-4 Cumulative Contair. ment Failure Probability, Temperature = 331*F . . .... . 42-12 43-1 AP600 Containment Event Tree Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43-9 43-2 Release Category Descriptions . . . . . . . . . . . .......... . . . . . . . 43-10 43-3 Large Release Frequency, CCFP, and C, by Accident Class . . . . . . . . . . . . . 43-11 ]

, 43-4 Dominant Containment Event Tree Sequences for Large Release

('s j Ivequency .... .................... .....................43-12 43-5 Accident Class 3BE Core Damage Sequences . . . . . . . . . . . . . . . . . . . . . . 43-15 43-6 Accident Class 3BL Core Damage Sequences . . . . . . . . . . . . . . . . . . . . . . 4 3 - 17 l 43-7 Accident Class 3BR Core Damage Sequences . . . . . . . . . . . ........... 43-20 )

43-8 Accident Class 1 A Core Damage Sequences . . . . . . . . . . . . . . . . . . . . . . 43-21 43-9 Accident Class I AP Core Damage Sequences . . . . . . . . . . . . . . . . . . . . . . . 43-23 43-10 Accident Class 3A Core Damage Sequences . . . . . . . . . . . . . . . . . . . . . . . . 43-24 43-11 Accident Class 3C Core Damage Sequences . . . . . . . . . . . . . ... ..,... 43-25 43-12 Accident Class ::D Core Damage Sequences . . . . . . . . . . . . . . . . . . . .... 43-26 43-13 Accident Class 6 Core Damage Sequences .................... . . . . 43-27  ;

43-14 Dominant Cutsets for Large Release Frequency . . . . . . . . . . . . . . . . . . . 43-29  !

43-15 17CFE 3BE Large Release Frequency Sequence Cutsets . . . . . . ........ . 43-33 43-16 19BP6 Large Release Frequency Sequence Cutsets . . . ....... . ...... 43-42 43-17 19BP 3A Large Release Frequency Sequence Cutsets . . . . . . . . . ...... . 43-52  !

43-18 19P1 A Large Release Frequency Sequence Cutsets . . . . . . . . . . . . . . . . . . . . 43-60  !

43-19 19BPI AP Large Release Frequency Sequence Cutsets ........ .. . . . . . 43-69 43-20 8CFE 3C Release Frequency Sequence Cutsets . . . . . . . . . . . . . . . . . . . 43-79 43-21 17CFE 3D Large Release Frequency Sequence Cutsets . ..... ........ 43-80 43-22 1 SCI 3BE Large Release Frequency Sequence Cutsets ............. . . . 43-88  :

43-23 18CI 3D Large Release Frequency Sequence Cutsets . . . . . . ......... . 43-97 (

! 43-24 18CI 3BL Large Release Frequency Sequence Cutsets ...... . . . . . . . . .43-106 43-25 18CI 3C Large Release Frequency Sequence Cutsets ................ .43-115 43-26 6 CFE 3BE Large Release Frequency Sequence Cutsets . . . . . . . . . . . .43-118 Revision: 9 ENEL l [ W85tingh0Use m =: % April 11,1997 l [j o:\ap600\pravev_9%pra-latwpf;1b I

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LIST OF TABLES (Cont.)

O Table No. Title Page 43-27 18CI 3A Large Release Frequency Sequence Cutsets . . . . . . . . . . . . . . . 4 3- 129 43-28 18CI 3BR Large Release Frequency Sequence cutsets . . . . . . . . . . . . . . . 4 3- 143 44-3 MAAP Model Benchmarks . . . . . . . ......... ........... . . . . . . 44-8 45-1 Environmental Release Fmetions at 24 Hours After Core Damage Per Release Category . .. ..... ........ . .. . ........ . . . 45-8 45-2 Environmental Release Fractions at 72 Hours After Core Damage Per Release Category . . . ............... . .. . ... ..... .45-9 45-3 Release Category IC Cases for Comparison . . ........ ........... . 45-10 f 45-4 Release Category BP Cases for Comparison .. ...... . . . . . . . . . . . 45-11 45-5 Release Category CFE Cases for Cotaparison ... .... ........... .. 45-12 45-6 Release Category CFI Cases for Comparison . . . . . . . ...... ..... . . 45-13 45-7 Summary of Source Term Sensitivity Studies ..... . . . . . . . . . . . . . . 45- 14 45-8 Volatile Aerosols (Represented by Iodine) . . . . . . .. ... .. .. 45-15 1 45-9 Non-Volatile Aerosols (Represented by Strontium) . .. . . . . . . . . . . . . . 45- 16 49-1 AP600 Source Terms From Level 2 Analysis . ... . .. . ...... . 49-9 49-2 AP600 Source Tcrms for Dose Evaluation (MACCS) ..... ........ . 49-10 l

49-3 Site Boundary Whole-Body Dose (Effective Dose Equivalent) . . . . . . . . ... 49-11 49-4 Site Boundary Thyroid Dose . . . . ...... .........,........... 49-12 l 49-5 Po,nulation Whole-Body Dose (0 to 80.5 km Radius) . . . . . . .... . . . . 49-13

! 49-6 Site Boundary Red Marrow Dose .. .... . ....... ..... . . 49-14 49 7 Dose Summary . . . . . . . . . . . . . . . . . . . ........................49-15 49-8 Site Boundary Dose Risk - 24 Hours . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 9- 16 49-9 Site Boundary Dose Risk - 72 Hours . . . . . . . ... ......... . . . . . . 49-17 49-10 Population Dose Risk - 24 Hours . . . . . . . . . . . . ............ ... . 49-18 49-11 Population Boundary Dose Risk - 72 Hours ... .. .. ........... . 49-19 50-1 AP600 PRA Core Damage From Intemal Initiating Events At-Power Risk Decrease Ranking of Initiating Events . . . . . . . . . . . . . . . . . . . 5 0-26 50-2 AP6'00 PRA Core Damage From Intemal Initiating Events At-Power Conditional Core Damage Ranking of Initiating Events . . ....... .. . 50-28 50-3 AP600 Common Cause Importances - Risk Decrease .. .. . . . ... 50-30 50-4 AP600 Common Cause Importances Risk Increase . .............. . 50 31 50-5 Human Error Risk Importances - Risk Decrease ....... . . . . . . . . . 50-33 50-6 Human Error Risk Importances - Risk Increase . . . . . ........ . 50-34 50-7 AP600 Component Importances - Risk Decrease . . . . . . . . . ...... . . 50-35 50-8 AP600 Component Importances - Risk Increase . . ... . . . . . . . . . . . . 50-36 50-9 System Importance Calculation Results ..... ... .... ..... . . . 50-37 50-10 AP600 Systems Grouped by PRA System Importance . ........... . 50-39 Revision: 9 9

April 11,1997 o:\ap600\praWv 9\pra-lot.wpf:lb lii h_ [ Westingh0!!Se

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LIST OF TABLES (Cont.)

Table No. TJat Esse 50-11 Operator Actions in the hcMine PRA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-40 50-12 Contribution orInitiating Events to Core Damage Frequency for Sensitivity Case with Failure of all Operator Actions . . . . . . . . . . . . . . . . . 50-4 2 50 13 Operator Actions in Sensitivity Case 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-43 50-14 Component Importances - For Risk Decrease Measure (At Power) . . . . . . . . . 50-45 50-15 Component Importances - For Risk-Increase Measure (At Power) . . . . . . . . . . 50-55 50-16 Containment Event Tree Node Irpportances . . . . . . . . . . . . . . . . . . . . . . . . . 50-65 50-17 Contribution of Initiating Events to Large Release Frequency . . . . . . . . . . . . 50-66 50-18 Initiating Event vs Containment Effectiveness (C,) . . . . . . . . . . . . . . . . . . . 50-67 50-19 End-State Importances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-68 50-20 Summary of Large Release Frequency Component Importances Sorted ,

l .

by Risk Increase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-69

l. 50-21 Summary of Large Release Frequency Component Importances Sorted by Risk Decrease . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-75 51-1 Uncertainty Analysis Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . ......... 51-7 ,

51-2 Basic Event Uncertainties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51-9 51-3 Summary of Results of PRA Uncertainty Analysis for Internal Events at Power . . . . . . . . ...................................51-17 52-1 Nonsafety-Related Systems Removed from Baseline PRA Analysis . . . . . . . . 52-25 52-2 Safety-Related Systems credhed in the Focused PRA Sensitivity Study . . . . . 52-26 52-3 At-Power Front-Line System Fault Trees . . . . . . . . . . . . . . . . . . . . . . . . . . 52-27 52-4 At-Power Focused PRA Sensitivity Study PMS Fault Trees . . . . . . . . . . . . . . 52-29 52-5 At-Power Focused PRA Sensitivity Study Core Damage Contribution by Initiating Event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 52-31 l 52 6 At-Power Focused PRA Core Damage Quantification Cutsets . . . . . . . . . . . . 52-33

~ 52-7 At-Power Focused PRA Core Damage Quantification Accident Sequences . . . . 52-50 52-8 At-Power Focused PRA Sensitivity Study Core Damage Contribution by B asic Events . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . 5 2-56 52-9 Results of the Accident Class Quantification . . . . . . . . . . . . . . . . . . . . . . . . 52-66 52-10 Summary of Release Frequency Calculations . . . . . . . . . . . . . . . . . . . . . . . . 52-67 52-11 Dominant Containment Event Tree Sequences . . . . . . . . . . . . . . . . . . . . . . . 52-68 52-12 AbPower Initiating Event Contributions to Large Release Frequency . . . . . . . 52-70 52-13 Shudown Frontline System Fault Trees . . . . . . . . . . . . . . . . . . . . . . . . . . . 52-72 52-14 Shutdown Focused PRA SensiCvity Study PMS Fault Trees . . . . . . . . . . . . . 52-73 52-15 Shutdown Focused PRA Sensitivity Study Core Damage Contribution by Initiating Event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52-74 52-16 Shutdown Focused PRA Sensitivity Study Top 200 Cutsets . . . . . . . . . . . . . . 52-75 52-17 Shutdown Focused PRA Sensitivity Study Accident Sequences . . . . . . . . . . . 52-93 (O_-) Revisi a: 9 g

RMg 6 April 11,1997 jjjj cAap600%prairev.9\pra-lot.wpf.lb

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LIST OF TABLES (Cont.)

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_ able No. Title P_ age l 52-18 Shutdown Focused PRA Sensitivity Study Core Damage Contribution by Basic Event ........ ..... ..... ..... ... ..... .... . 52-97 52-19 Shutdown Focused PRA Sensitivity Study Release Frequency Results Summary by Release Category ... ...... . ..... .........52-103 52-20 Shutdown Release Category IC Reaults Summary .. ....... ...... .52-104 52-21 Shutdown Release Category ICP Results Summary . . . . . . . . . . . . . . . . . . .52-105 52-22 Shutdown Release Category XL Results Summary ................ .52-106 52-23 Shutdown Release Category BP Results Summary . . .......... . . . .52-107 52-24 Shutdown Release Category CI Results Summary .. ............ ...52-107 52-25 Shutdown Release Category CI-C Results Summary . . . . . . . . . . . . . . . .52-108 52-26 Shutdown Release Category CFE Results Summary . . . . . . . . . . . . . . . .52-108 52-27 Shutdown Release Category CFE-C Results Summary ................52-109 52-28 Shutdown Release Category CFI Results Summary . . . . . . . . . . . . . . . . . . 5 2- 1 10 52-29 Shutdown Release Category CFL Results Summary . . . . . . . . . .. ...52-110 52-30 Shutdown Release Category CFV Results Summary . . . . . . . . .... .52-111 52-31 At-Power Focused PRA Sensitivity Study Flooding-Induced Core Damage Frequency Quantification Results Summary . . . . . . . . . . . . . . . ..52-112 52-32 Shutdown Focused PRA Sensitivity Study Flooding-Induced Core Damage Frequency Quantification Results Summary . . . . . . . . . . . . . . .52-114 52-33 Summary of Focused PRA Sensitivity Study Results ... ........... .52-116 54-1 Matrix: Shutdown Phase / Outage Type / Operating Mode . . . . . . . . . . . . . . . . 54-89 54-2 Systems Availability and Actuating Signals Type . . . . . . . . . . . . . . . . .. 54-90 54-3 Initiating Event Frequencies Used in Event Tree Quantification . . . . . . . . . . 54-92 54-4 AP600 Shutdown Mission Times and Frequencies . ........... .... . 54-93 54-5 Mission Times for Normally Operating Systems for AP600 Shutdown Fault Trees & Event Tree Quantification . . ....... ..... ... . ... 54-94 54-6 Initiating Event Frequencies Used in AP600 Shutdown Event Tree Quantification . . . . ............. . ... ............. ... 54-95 54 7 List of System Fault Trees (Shutdown Case) . . . . . . . . . ...... .. 54-96 54-8 System Unavailability Status . . . . . . . . . . ..... . ..... . .. ..54-101 54-9 PMS/DAS I&C Subtrees for Modeling Shutdown PRA . ....... .. ...54-106 54-10 PMS/DAS I&C Fault Tree Equivalents: Shutdown and At-Power Cases . . . . . . . . ........... ............... ..54-109 54-11 PMS/DAS Subtree Success Criteria Summary . . . . ......... . ...54-111 54-12 Data Developed for the PMS/DAS Shutdown I&C Models . . ... ... .54-129 54-13 Operator Actions Assignments for the PMS/DAS I&C Analysis . . . . . . . . . .54-131 54-14 PLS I&C Subtrees for Modeling Shutdown PRA . . . ...... ..... .54-138 54-15 PLS I&C Fault Tree Equivalents: Shutdown and At-Power Cases . . ..54-139 54-16 PLS Subtree Success Criteria Summary .. ............. . . . . . . . .54-140 54-17 Data Developed for PLS I&C Analysis . . . . ............. ..54-142 Revision: 9 O

ENEL April 11,1997 my=6 [ Westi!1gt100S8 c:hp600\pra\rev.9\pra-lot.wpf: I b liv

151 pJ LIST OF TABLES (Cont.)

Table No. Title P_REe 54-18 Operator Actions Assignments for the PLS I&C Analysis . . . . . . . . . . . . . .54-143 54-19 PMS/DAS I&C Subtrees Used in Modeling Shutdown Assessment Plant Damage State Trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54- 144 54-20 PMS/DAS I&C Fault Tree Equivalents: Shutdown and At-Power Level 2 Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 144 54-21 Operator Action Assignments for the PMS/DAS Level 2 I&C Analysis . . . . .54-145 54-22a ADS Success Criteria Versus Accident Conditions Fell Depressurization Shutdown Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4- 14 6 54-22b ADS Fault Tree Summary (For Plant Damage States for Events Initiated During Shutdown) . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4- 1 46 54-23 Fault Tree ADAS Success Crite-ia Summary . . . . . . . . . . . . . . . . . . . . . . .54-147 54-24 Fault Tree ADTS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-148 54-25 Fault Tree ADALS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-149 54-26 Fault Tree ADLS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-150 54-27 Fault Tree CIST Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . 54- 151 54-28 Fault Tree CM2AM Success Criteria Summary . . . . . . . . . . . . . . . . . . . . 54- 15 2 54-29 Fault Tree CM2 AMP Success Criteria Summary . . . . . . . . . . . . . . . . .. .54-153

' (g 54-30 54-31 Fault Tree IW2AB Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-154 Fault Tree IW2A Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-155 54-32 Fault Tree IW2AO Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-156 54-33 Fault Tree IW2AP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-157 54-34 Fault Tree IWFS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . 54- 15 8 54-35 Fault Tree IWRNS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-159 54-36 Fault Tree PCTS Success Criteria Summary ................ . . . . . .54-160 54-37 Fault Tree PRM Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-161 54-38 Fault Tree PRMP Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-162 54-39 Fault Tree PRW Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . 54- 163  !

54-40 Fault Tree RNC2 Success Criteria Surmnary . . . . . . . . . . . . . . . . . . . . . . .54-164 54-41 Fault Tree RNT2 Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-165 54-42 Fault Tree RNP2 Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-166 54-43 Loss of CCS/SWS During Shutdown Initiating Event Fault Tree CSWF2 Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-167 l l 54-44 Fault Tree CCTS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . 54- 16 8 1 54-45 Fault Tree CCPS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-169 54-46 Fault Tree SWTS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . . .54-170 54-47 Fault Tree SWPS Success Criteria Summary . . . . . . . . . . . . . . . .......54-171 i

54-48 Fault Tree VLHS Success Criteria Summary . . . . . . . . . . . . . . . . . . . . . .54-172 I I

l 54-49 AC & DC Fault Trees Success Criteria Summary . . . . . . . . . . . . . . . . . . . .54-173 l 54-50 Fault Tree ADQLTS Data Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-187

'54-51 Fault Tree ADTLTS Data Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-188 1 54-52 AP600 Shutdown Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4- 1 8 9 f

iw ENE Revision: 9 3 W8Shl @ 0tlS8 m:5.,:. April 11,1997 ly oMp600\pra\rev_9%pra lot wpf.lb L________________ __ . _ _ _ _ _ _

u.w=

' i l

LIST OF TABLES (Cont.)

O l

Table No. Title _P,aage 54-53 ADS Success Criteria for Shutdown Conditions . . . . . . .. . . . . . . . . . . . 54- 190 54-54a Sequence of Events for MAAP4 Cases Supporting ADS Success Criteria ADTS, ADLS . . . . . . . . . . . . . . . . . ...................... .. .54-192 54-54b Sequence of Events for MAAP4 Cases Supporting ADS Success Criteria ADSS .. ................ . .............. . . . . . . . . . .54-193 54-54c Sequence of Events for MAAP4 Cases Supporting ADS Success Criteria ADTS ............................................ ....54-194 54-54d Sequence of Events for MAAP4 Cases Supporting ADS Success Criteria ADLS and ADTS . . . . . . . . . . .. . ...... ....... .... .. .54-195 54-54e Sequence of Events for MAAP Cases Supporting ADS Success Criteria ADNS ..... .............. ............ . ...........54-196 54-55 Common Cause Failure Evaluated for Shutdown . . . . . . . ..........54-197 54-56 AP600 Shutdown Assessment HEP Summary Results . . . ........ ...54-198 54-57 Dependency Level Evaluation Summary for Shutdown Assessment ......54-207 .

54-58 Shutdown Master Data Bank . . . . . . . . . . . . . . . . . . . ...... .. ... .54-211 54-59 List of Basic Events and their Descriptions (Shutdown Model) . . . . . . . . .54-227 54-60 AP600 Shutdown Assessment Level 1 Accident Sequences Quantification Results . . . . . ............... ........ ........54-235 54-61 List of Dominant Sequences (At Shutdown) ................ . . . . . .54-236 54-62 List of Dotninant Cutsets (At Shutdown) . . . . . . . . . . . . . . . . . . . . . . . . .54-240 54-63 Shutdown initiating Event Importances . . . . . . . . . . . . . . . . . . . . . . . . . . .54-251 54-64 Basic Event Importances Using Risk-Decrease Measure (At Shutdown) . . . . .54-252 54-65 Basic Event Importances Using Risk-Increase Measure (At Shutdown) . . . . .54-258 54-66 AP600 Containment Event Tree Nodal Questions . .. ..... . ... ...54-264 54-67 AP600 Release Category Summary ..... ................ ...54-265 54-68 Summary of Shutdown and Low-Power Accident Classes . . . . . . . . . . . .54-266 54-69 AP600 Shutdown and Low-Power Plant Damage Substate Frequencies . .54-267 54-70 AP600 Shutdown and Low-Power Plant Damage Substate Conditional Probabilities . . . . ................ . ...... ....... .54-268 54-71 AP600 Shutdown and Low-Power Containment Event Tree Quantification Results - Release Category Frequencies (Per Reactor-Year) . . . . . . . . . . . . .54-269 54-72 Release Category IC Dominant Sequences . . . . . . . ........... .. .54-270 54-73 Release Category ICP Dominant Sequences . . . . . . . . . . . . . . ......54-271 54-74 Release Category XL Dominant Sequences . . . . . ... ... ..... ...54-272 54-75 Release Category BP Dominant Sequences . . . . .. .. .. ... . . . .54-273 54-76 Release Category CI Dominant Sequences . . . .............. .. .54-274 54-77 Release Category CI-C Dominant Sequences . . . . . . . ....... ...54-275 54-78 Release Category CFE Dominant Sequences . . . . . . . . . . . . . . . . . . ....54-276 54-79 Release Category CFE-C Dominant Sequences .....................54-277 54-80 Release Category CFI Dominant Sequences . . . . . ... .. .. ... ...54-278 54-81 . Release Category CFL Dominant Sequences ......... ... ... ...54-279 Revision: 9 O

ENE [ Westiligh0USB April 11,1997 wrah onap600praWv.9pra-lot.wpf;1b lvi

1 LIST OF TABLES (Cont.)

Table No. .Thlt East 54-82 Release Category CFV Dominant Sequences . . . . . . . . . . . . . . . . . . . . . . .54-280 54-83 Core Damage for Intemal Initiating Events at Shutdown - Risk Decrease . . .54-281 54-84 Core Damage for Internal Initiating Events at Shutdown - Risk Increase . . . .54-282 54-85 Shutdown Common Cause Importance - Risk Decrease . . . . . . . . . . . . . . . .54-283 54-86 Shutdown Common Cause Importance - Risk Increase . . . . . . . . . . . . . . . .54-284 54-87 Shutdown Human Error Risk Importance - Risk Decrease . . . . . . . . . . . . . .54-285 54-88 Shutdown Human Errcr Risk Imponance - Risk Increase ..............54-285 54-89 Shutdown Component Importance - Risk Decrease . . . . . . . . . . . . . . . . . . .54-286 54-90 Shutdown Component Imponance - Risk Increase . . . . . . . . . . . . . . . . . . .54-286 54-91 Operator Actions for Sensitivity Cases 7 and 8 . . . . . . . . . . . . . . . . . . . . .54-287 54-92 Matrix of Shutdown Initiating Events Screening Process . . . . . . . . . . . . . . .54-288 q 54-93 Technical Specification Requirements for Safety-Related Components . . . . . .54-298 1 t

55-1 Seismic Margin HCLPF Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . - . . . . 55-72 55-2 SMA Event Tree Success Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-77

~ 55 3 - Basic Event HCLPF Values ................................... 55-80 i 55-4 EQ-IEV-STRUC HCLPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-84 l 55-5 EQ-IEV-RVFA HCLPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-85

[ 55-6 EQ-IEV-LLOCA HCLPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-86 55-7 EQ-IEV-SLOCA HCLPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-87 a 55-8 EQ-IEV-A*IWS HCLPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-88 {

55 9 System HCLPFs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-89 )

55-10 Sequence HCLPFs ........................................55-90 55-11 SM. . Mixed Cutsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-92 55-12 LarFe Release HCLPFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-93 55-13 med Cutsets for LOSP Operator Action Sensitivity . . . . . . . . . . . . . . . . . . 55-95 55-14 Mixed Cutsets for LOSP 72-hour Mission Time Sensitivity . . . . . . . . . . . . . 55-102 56-1 AC and Non-class IE DC Equipment Locations . . . . . . . . . . . . . . . . . . . . . . 56-55 56-2 AP600 Building Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-57 56-3 Flooding Analysis Initial Screening Results . . . . . . . . . . . . . . . . . . . . . . . . . 56-59

, 56-4 At. Power Detailed Screening Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-63 l 56-5 At-Power Flooding-Induced Core Damage Frequency Quantification Summary Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-68

! 56-6 Shutdown Flooding-Induced Core Damage Frequency Quantification Summary Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-72 56-7 At Power Flooding Dominant Cutsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-77 56-8 Shutdown Flooding Dominant Cutsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6- 87 l

l Revision: 9 l YN w Ivii April 11,1997 oVmPa*v W"P *f

l I LIST OF TABLES (Cont.)

O Table No. Title _P_ age 57-la AP600 Systems Credited for Power Operation . . . . . . . . . . . . . . . . . . . . . . 57-50 57-lb AP600 Systems Credited During Safe Shutdown and Mid-Loop Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7-51 57-2a Automatic Suppression System Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 57-52 57-2b Fire Areas with Automatic Fire Suppression . ...................... 57-52 57-3 Fire Barrier Failure Probabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57-53 57-4 Summary of Qualitative Evaluation Results - Power Operation . . . . . . . . . . . . . . . ................ . . . . . . . . . . . . . . . 5 7-54 57-5 Summary of Qualitative Evaluation Results for Containment for Power Operation . . . . . . . . . . . . . . . . . . . . . . . 5 7 -67 57-6 Fire Ignition Frequencies for AP600 Fire Areas . . . . . . ......... . . . . . 57-69 57-7 Fire Ignition Frequencies for AP600 Containment Fire Area . . . . . . . . . . . . 57-72 57-8 Summary of Fire Damage State Binning Process -

Power Operation . . . . . . . . . .................... ........ . . . 57-73 57-9 Summary of Fire Damage State Binning Process for Containment - Power Operation . . . . . . . . . . . . . . . . . ............ . . 57-81 57-10 Contribution of Fire-Induced Initiating Event to Plant Core Damage Frequency - Power Operation ....... .. ....... 57-83 57-11 AP600 Fire Scenario Initiating Frequency Binning -

Power Operation . . . . . . .................................... 57-84 57-12 List of Top 200 Dominant Cutsets - Power Operation . . . . . . . . . . . . . . . . . . 57-86 57-13 Summary of Quantitative Analysis Results . . . . . . . . . . . . . . . . . . . . . . . . 57- 100 57-14 Summary of QuantitatNe Analysis Results for Containment . . . . . ......................... . . . . . . . . . . . . .57-109 57-15 Quantification of Core Damage Frequency for Control Room Fire Scenarios - Power Operation . . . . . . . . . . ............ .57-111 57-16 Summary of AP600 Plant Operational State (POS)

Times for Shutdown . . . . . . . . ..,... ..... ......... . . . .57-112 57-17 Shutdown Fire Ignition Frequencies for AP600 Fire Areas ..... . . . . . . .57-113 57-18 Fire Ignition Frequencies for AP600 Containment Fire Area . . . . ...................... .. ............. ..57-116 57-19 Summary of Fire Areas in which a Fire Can Initiate Spurious ADS Actuation (LOCA) .................... ... ...57-117 57-20 Shutdown Fire Damage State Definitions ........... .......... .57-118 57-21 Shutdown Containment Fire Damage State Definitions ..... ......57-119 57-22 Summary of Qualitative Evaluation Results - Safe Shutdown . . . . . . . . ..... ...... .. .... .... ........ .57-120 57-23 Summary of Qualitative Evaluation Results for Containment Shutdown Operation (After Screening) . . . . . . . . . . . . . . . . .57-128 57-24 Summary of Quantitative Analysis Results - Safe Shutdown . . . . . . ..... .... ................... .... .57-129 Revision: 9 9

ENEL WeStiflgt10USB April 11,1997 mut:6 ow600pwev_9,maatwpr.ib Iviii

g b

LIST OF TABLES (Cont.)

Table No. Title bage 57-25 Quantitative Summary - Control Room Fires During ,

Safe Shutdown .......................................57-138 l 57-26 Summary of Qualitative Evaluation Results -

Mid-Loop Operation . . . . . . . . . . ..... ................... ...57-139

]

l 57-27 Summary of Quantitative Results - Mid-Loop Operation . . . . . . . . . .57-146 .

57-28 Quantitative Summary - Control Room Fires During Mid-Loop Operation ............ .......... ..............57-154 j 57-29 Safe Shutdown Containment Single-Hot-Short LOCA Sensitivity . . ......57-155 1

59-1 Contribution of Initiating Events to Core Damage .. .. ........ ...59-104 59-2 Conditional Core Damage Probability of Initiating Events . . . . . . . . . .59-105 59-3 Intemal Initiating Events at Power Dominant Core Damage Sequences . . . .59-106  !

59-4 Sequonce 1 - Safety Injection Line Break Dominant Cutsets (SI-LB-02) . . . .59-108 i 59-5 Sequence 2 - Intermediate LOCA Dominant Cutsets (NLOCA-03) . . . . . . . .59-113 59-6 Sequence 3 - Large LOCA Dominant Cutsets (LLOCA-06) . . . . ......59-118 I 59-7 Sequence 4 - Large LOCA Dominant Cutsets (LLOCA-03) . . .. . . . . . .59-124 I 59-8 Sequence 5 - Reactor Vessel Rupture Cutset (RV-RP-02) . . . . . . . . . . . .. 59 130

,- 59-9 Sequence 6 - Large LOCA Dominant Cutsets (LLOCA-11) ..... . ....59-131

(~qj 59-10 Sequence 7 - ATWS Dominant Cutsets (ATWS-28) . . . . ........., ..59-133 59-11 Sequence 8 - Medium LOCA Dominant Cutsets (MLOCA-03) ..........59-141 59-12 Sequence 9 - ATWS Dominant Cutsets (ATWS-13) . . . . . . . . . . . . . . . .59-146 ,

59-13 Sequence 10 - Intermediate LOCA Dominant Cutsets (NLOCA-04) . . . . . . .59-151 59-14 Sequence 11 - Safety Injection Line Break Dominant Cutsets (SI-LB-03) .. 59 156 59-15 Sequence 12 - Small LOCA Dominant Cutsets (SLOCA-03) . . . . . . . . . ..59-160 59-16 Sequence 13 - Lore Makeup Tank Line Break Dominant Cutsets (CMTLB-03)59-165 59-17 Sequence 14 - Steam Generator Tube Rupture Dominant Cutsers (SGTR-07) .59-170 59-18 Sequence 15 - Steam Generator Tube Rupture Dominant Cutsets (SGTR-23) .59-171 j 59-19 Sequence 16 - Large LOCA Dominant Cutsets (LLOCA-02) . .... ...59-177

{

59-20 Sequence 17 - Large LOCA Dominant Cutsets (LLOCA-05) . . ...... .59-183 59-21 Sequence 18 - Consequential SGTR Dominant Cutsets (SGTRC-03) . . . .59-189 59-22 Sequence 19 - Intermediate LOCA Dominant Cutsets (NLOCA-16) . . . ...59-195 l 59-23 Typical System Failure Probabilities. Showing Higher Reliabilities l for Safety Systems . . . . . . . . . . . .. ......... . ............ .59-201 l

59-24 Dominant CET Sequences . .... .. ........... .... . ... 5M02 J 59-25 Comparison of Initiating Event Contribution to Core Damage and Large Release Frequencies ...... ............ .... . . . . . . . .59-203 3 59-26 Summary of AP600 PRA Results . . . . . . . . . . . . . . . . . . . . . . .......59-204 l l 59-27 Comparison of AP600 PRA Results to Risk Goals . . . . . . . . . . . . . . . . . . .59-205 59-28 Site Boundary Dose Risk at 24 Hours .......... ... . . . . . . . . . 5 9-206 1 59-29 AP600 PRA-Based Insights . . . . . . . . .. .. .. .......... . . .59-207 O

'V1 l Revision: 11 l j

[ W85tiligh00S8 hh_ }jx March 1998 o:\ap600\ prs \rev_l l\pra-lot.wpf:I b

! l i ___________a

)

LIST OF FIGURES e

Firure No. Title P_ age 2-1 Core Damage Logic Diagram for Internal Initiators . ...... .. . .. . 2-58 2-2 Core Damage Logic Diagram for Internal Initiators . ....... .. . . . 2-59 2-3 Core Damage Logic Diagram for Intemal Initiators .. ........ .. . . . 2-60 2-4 Core Damage Logic Diagram for Internal Initiators ............... .... 2-61 4-1 Large Loss-of-Coolant-Accident Event Tree ... ... ..... ......... 4-120 4-2 Medium Loss-of-Coolant Accident Event Tree . .. . . . . . . . . . . . . . . . ... . 4-121 4-3 Core Makeup Tank Line Break Event Tree . . . . ................ . . . 4-122 4-4 Direct Vessel Injection Line Break Event Tree . ... .......... . . . . . 4-123 4-5 Intermediate Loss-of-Coolant Accident Event Tree . ......... . .. 4-124 4-6 Small Loss-of-Coolant Accident Event Tree .. . ... ... . . . 4-125 4-7 Reactor Coolant System Leak Event Tree . . .... . ...... . . . . . . . . 4-126 4-8 Pa.;sive Residual Heat Removal Tube Rupture Event Tree . . . . . . .. . . . 4-127 4-9 Steam Generator Tube Rupture Event Tree . . . . . . . . ........ .. . . . . 4-128 4-10 Reactor Vessel Rupture Event Tree ....................... .... . 4-130 4-11 Interfacing Systems Loss-of-Coolant Accident Event Tree . . . . . . . . . .. .. 4-131 4-12 Transients with Main Feedwater Event Tree ... ........... . . . . 4-132 4-13 Transients with Loss of Reactor Coolant Sstem Event Tree . . . . . . . . . . . . . 4-133 4-14 Transients with Loss of Main Feedwater Event Tree . . . . . . . . . . . . . . . . . . 4- 134 _

4-15 Transients with Core Power Excursion Event Tree .......... ... . . . . 4- 13 5 4-16 Loss of Component Cooling Water System / Service Water System Event Tree ...... . . .... ..... .... .. ... ...... . . 4-136 4-17 Loss of Main Feedwater Event Tree . . . -. . . . . .. ..... . ... . . . . . 4-137 4-18 Loss of Condenser Event Tree . . . . . . . . ... .. ............. . . 4-138 4-19 Loss of Compressed Air Event Tree . . . . . . .. ............... . . 4-139 4-20 Loss of Offsite Power Event Tree .. ....... ................. . 4-140 4-21 Main Steam Line Break Downstream of Main Steam Isolation Valves Event Tree . . . . . . . . . . . . . . . . . ....... .......... .. . 4-141 4-22 Main Steam Line Break Upstream of Main Steam Isolation Valves Event Tree . . ............ ........ . .. . . 4-142 4-23 Stuck-Open Secondary. Side Safety Valve Event Tree . . . . . . . . . .. . . . . 4-143 4-24 Anticipated Transient Without Scram Precursor without Main Feedwater Event Tree . . .... ... .. . . . .. ... . . . . 4-144 4-25 Anticipated Transient Without Scram Precursor with Injection Event Tree ....... .. .. . ...... . ... .... ... .. . 4-146 4-26 Anticipated Transient Without Scram Precursor Transients with Main Feedwater Event Tree . . ...... ... ......... ... . 4-147 O

Revision: 9 April 11,1997 _ 3 WBStiflgh0USB oWGprairev.9%pra-lof wpf.lb lx

IO l v)

'\

LIST OF FIGURES (Cont.)

Fieure No. Title Page 4A-1 Example Event Tree for Illustration of Terminology . . . . . . . . . . . . . . . . . . . 4A-7 4A-2 Functional Event Tree .....................................

. 4A-8 4A-3 Illustration of Consequential Event End States . . . . . . . . . . . . . . . . . . . . . . 4 A-9 7-1 Power / Control Model for Large Loads (4160-vac/480-vac Pumps, Fans, and Motors) .. ......................................... .. 7-34 7-2 Power / Control Model for Motor-Operated Valves . . . .................. 7-36 7-3 Power / Control Model for Air-Operated Valves . . . . . . . . . . . . . . . . . . . . . . . . 7-38 7-4 Power / Control Model for Variable Speed Motor (Main Feedwater Pump) . . . . . 7-40 7-5 An Illustration of Fault Tree Basic Events for a Pump following the Model Given in Figure 7-1 . . . . . . . . . ................................7-42 8-1 Passive Residual Heat Removal System Sketch . . . . . . . . . . . . . . . . . . . .. 8-23 8-2 Passive Core Cooling System - Passive Residual Heat Removal Piping and Instrumentation Diagram . . . . . . .............. ........ 8-25 9-1 Core Makeup Tank Subsystem Sketch . . . . . . . . . . . ....... ......... 9-25 9-2 Passive Core Cooling System Piping and Instrumentation Diagram . . . . . . . .. 9-27 i

i \

C) 10-1 Passive Core Cooling System - Accumulator Subsystem . . . . . . . . . . . . . . . 10-13 11-1 Automatic Depressurization System Sketch . . . . . . . . . . . . . . . . . . . . . . .. 11-44 12-1 IRWST Subsystem Sketch . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . 12-38 13-1 Passive Containment Cooling System Sketch . . . . . . . . . . . . . . . . . . . . . .. 13-12 14-1 Feedwater System Piping and Instrumentation Diagram .. ............ 14-45 14-2 Condensate System Piping and Instrumentation Diagram . . .............. 14-51 14-3 Main Steam System Piping and Instrumentation Diagram . , . . . . . . . . . . . . . 14-53 >

14-4 Turbine Building Closed Cooling Water System Piping and i Instrumentation Diagram . . . . . . . . . . . . . . . . . . . .... .. ... . . . . 14-55  !

14-5 Circulating Water System Piping and Instrumentation Diagram . . . . . . . . . 14-61 l l 15-1 Chemical and Volume Control System Sketch . . . . . . . . . . . . . . . . . . . . . 15-25 l

15-2 Chemical and Volume Control System Piping and Instmmentation Diagram . . . . . . . . . . . . ... ......... ........... 15-27 l

l 17-1 Normal Residual Heat Removal System Sketch . .............. . . . . . 17-19

! 17-2 Normal Residual Heat Removal System Piping and Instmmentation Diagram . . 17-21 18-1 Component Cooling Water System Piping and Instrumentation Diagram . . . . 18-13 A

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. LIST OF FIGURES (Cont.)

e Figure No. Title P_aage 19-1 Service Water System Piping and Instrumentation Diagram . . ...... ... . 19-17 20-1 Central Chilled Water Low-Capacity Subsystem Piping and Instmmentation Diagram . . . . . . ... ....... ...... ........ . . . 20-13 21-1 AC Power System One-Line Diagram . . . . . . . . . . . . . . . . . . . . . . . . . ... 21-61 22-1 Class IE de System One-Line Diagram ........... .. ....... ... 22 53 22-2 Class IE UPS One-Line Diagram ....... ... ....... ..... . .. 22-57 23-1 Non-Class IE de and UPS System One-Line Drawing . . ......... . 23-43 23-2 Non-Class IE de and UPS System Sketch . .... .. ... . . . . . . . . . 23-47 25-1 Instmment Air Subsystem Sketch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25- 19 27-1 Diverse Actuation System Block and Interface Diagram . . . . . . . . . . . . . . . 27- 13 e

29-1 IRWST Valve Configuration . . . .. . .. .. . ................. 29-23 30-1 Human Reliability Analysis Quantificatio Model ... ... . ........30-115 34-1 Case 3BE-1: RCS Pressure and SG Pressure ........ .............. 34-68 34-2 Case 3BE-1: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . ............. 34-69 34-3 Case 3BE-1: Accumulator Water Mass and CMT Water Mass . . . . . . . . . . . 34-70 34-4 Case 3BE-1: IRWST Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-71 34-5 Case 3BE-1: Break Flows . . .. ......... ... ..... . ...... . 34-72 34-6 Case 3BE-1: Reactor Vessel Levels . . . . . . . . . ........... . ..... 34-73 34-7 Case 3BE-1: Core Temperatures . . . ................... . . . . . . . . 34-74 34-8 Case 3BE-1: Reactor Cavity Water Level and IRWST Water Level . . . . . . . 34-75 34-9 Case 3BE-1: Loop Compartment and Valve Vault Water Levels . ... .. 34-76 34 10 Case 3BE-1: Containment Pressure . . . . . . . . . . . . . . . . ... ..... ... 34-77 34-11 Case 3BE-1: Containment Temperatures . . .. .... .. . . .. . . . 34-78 34-12 Case 3BE-1: Debris Mass . .. ... ........ ...... ... . 34-79 34-13 Case 3BE-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . .. 34-80 34-14 Case 3BE-1: Hydrogen Generation . .. ... ..... ....... ... . 34-81 34-15 Case 3BE-1: Mass of Csl Released to Containment . . .... ....... ... 34-82 34-16 Case 3BE-1: Noble Gases Released . . . . . . . . . . . . . .. . ..... .... 34-83 34-17 Case 3BE-1: Releases to Environment . . . . . . . . . . . ............ ... 34 84 34-18 Case 3BE-1: Non-Volatile Release . ........... ............. 34-85 34-19 Case 3BE-2: RCS Pressure and SG Pressure .... . .......... ..... 34-86 Revision: 9 ENEL e

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LIST OF FIGURES (Cont.)

Fleure No. Title _P_ age 34-20 Case 3BE-2: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . . . ... . . 34-87 34-21 Case 3BE-2: Accumulator Water Mass and CMT Water Mass . . . . .... . 34-88 34-22 Case 3BE-2: IRWST Flows . . . . . . . . . . . . . . . .................. . 34-89 34-23 Case 3BE-2: B reak Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-90 34-24 Case 3BE-2: Reactor Vessel Levels . .. ............... . ... ... 34-91 34-25 Case 3BE-2: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-92 34-26 Case 3BE-2: Reactor Cavity Water Level and IRWST Water Level . . . . . . . . 34-93 34-27 Case 3BE-2: Loop Compartment and Valve Vault Water Levels . . . . . . . . . 34-94 34-28 Case 3BE-2: Contain nent Pressure . . . . . . ... ... . . . . ...... 34-95 34-29 Case 3BE-2: Containment Temperatures .. ..... ........ ... .. . 34-96 34-30 Case 3BE-2: Debris Mass ....,............. ...... . . . . . . . . 34-97 34-31 Case 3BE-2: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . ... . 34-98 34-32 Case 3BE-2: Hydrogen Generation . . . . ........ ............... 34-99 34-33 Case 3BE-2: Mass of Csl Released to Containment . . ............ ..34-100 34-34 Case 3BE-2: Noble Gases Released . . . . . . . . . . . . . . . .............34-101 34-35 Case 3BE-2: Releases to Environment . . . . . . . . . . . . . . .. .. . .. .34-102 34-36 Case 3BE-2: Non-Volatile Release ..... .... ........... .... .34-103 m 34-37 Case 3BE-3: RCS Pressure and SG Pressure .... .... ... ...... .34-104 34-38 Case 3BE-3: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . . . . . . . . . .34-105 34-39 Case 3BE-3: Accumulator Water Mass and CMT Water Mass . . . .. . .34-106 34-40 Case 3BE-3: IRWST Flows . . . . . . . . . . . . . . ... ........... ...34-107 34-41 Case 3BE-3: B reak Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34- 108 34-42 Case 3BE-3: Reactor Vessel Levels . . . . . . . ......... ..... . ..34-109 34-43 Case 3BE-3: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-110 34-44 Case 3BE-3: Reactor Cavity Water Level and IRWST Water Level . .....34-111 34-45 Case 3BE-3: Loop Compartment and Valve Vault Water Levels ....... .34-112 l 34-46 Cast 3BE-3: Containment Pressure . . . . . . . ....................34-113 34-47 Case 3BE-3: Containment Temperatures ...................... .34-114 34-48 Case 3BE-3: Debris Mass . .............................. . .34-115 34-49 Case 3BE-3: Reactor Vessel-to-Cavity Water Heat Transfer . .... .34-116 34-50 Case 3BE-3: Hydrogen Generation ... ..... . ..... ........ .34-117 34-51 Case 3BE-3: Mass of Csl Released to Containment . . . . . . . . . . . . . . . . .34-118 34-52 Case 3BE-3: Noble Gases Released . ......... .... .... . ..34-119 34-53 Case 3BE-3: Releases to Environment . . . . . .......... . . . . . .34-120 l

34-54 Case 3BE-3: Non-Volatile Release . . . . . ...... ............. .34-121  ;

34-55 Case 3BE-4: RCS Pressure and SG Pressure .. .......... . .....34-122 )

34-56 Case 3BE-4: Loop i ADS Stage 4 Flows . . . . ................ ...34-123 34-57 Case 3BE-4: Accumulator Water Mass and CMT Water Mass . . . . . . . . . . 34- 124 )

34-58 Case 3BE-4: IRWST Flows . . . . ... ................ . .. .. .34-125 34-59 Case 3BE-4: Break Flows . . . .... . . . ............. .... .34-126 m 1 V

3 Westinghouse b }xijj Ap 111, o:\ap600\pra\rev_9\pra-lofvpf:1b l

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I M 1 0; l LIST OF FIGURES (Cont.)

Figure No. Title Page 34-60 Case 3BE-4: Reactor Vessel Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-127 34-61 Case 3BE-4: Core Temperatures . . . . . . . . . . ....................34-128 34-62 Case 3BE-4: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-129 34-63 Case 3BE-4: Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-130 34-64 Case 3BE-4: Containment Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-131 34-65 Case 3BE-4: Containment Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . 34- 13 2 34-66 Case 3BE-4: Debris Mass . . . . . . . . . . . . . . . . . . . . . . . .... . . . . . .34-133 34-67 Case 3BE-4: Reactor Vessel-to-Cavity Water Heat Transfer . . ... ... .34-134 34-68 Case 3BE-4: Hydrogen Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-135 34-69 Case 3BE-4: Mass of Csl Released to Containment . . . . . . ... . .. .34-136 34-70 Case 3BE-4: Noble Gases Released . . . . . ...... . ... . . . . . . . . .34-137 34-71 Case 3BE-4: Releases to Environment . . . . . . . . . .................34-138 34-72 Case 3BE-4: Non-Volatile Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-139 34-73 Accident Class 3BE: Comparison of Mass Fraction Csl Released to Ctmt ..34-140 34-74 Case 3BE-5: RCS Pressure and SG Pressure ....... .......... .. .34-141 34-75 Case 3BE-5: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . . . . . . . . .34-142 34-76 Case 3BE-5: Accumulator Water Mass and CMT Water Mass . . . . . . . .34-143 34-77 Case 3BE-5: IRWST Flows . . . . . ......... .......... .......34-144 34-78 Case 3BE-5: Break Flows ............................. . . . .34-145 34-79 Case 3BE-5: Reactor Vessel Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-146 34-80 Case 3BE-5: Core Temperatures . . . . ... ........... ...... ...34-147 34-81 Case 3BE 5: Containment Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . 34- 14 8 34-82 Case 3BE-5: Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-149 34-83 Case 3BE-5: Containment Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-150 34-84 Case 3BE-5: Containment Temperatures . . . . . . . . . . . . . . . ...... .34-151 34-85 Case 3BE-5: Debris Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34- 15 2 34-86 Case 3BE-5: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-153 34-87 Case 3BE-5: Hydrogen Generation . . . . . . . . . . . . . . . . . . . . . . . . . . ..34-154 34-88 Case 3BE-5: Mass of Csl Released to Containment . . . . . . . . . . ... ...34-155 34-89 Case 3BE-5: Noble Gases Released . . . ... .. . ... ..... . . . .34-156 34-90 Case 3BE-5: Releases to Environment . . . . . . . . . . . . . . . . ..........34-157 34-91 Case 3BE-5: Non-Volatile Release . . . . . . . . . . . . . . . . . . ...... ...34-158 34-92 Case 3BE-7: RCS Pressure and SG Pressure .... ... .. . . . . . . . . . .34-159 34-93 Case 3BE-7: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . ........ .34-160 34-94 Case 3BE-7: Accumulator Water Mass and CMT Water Mass . ..... ..34-161 34-95 Case 3BE-7: IRWST Flows . . . . . . . ............. . ... . . . . . .34-162 34-96 Case 3BE-7: Break Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-163 34-97 Case 3BE-7: Reactor Vessel Levels . . . . . ............. . . . . . . .34-164 34-98 Case 3BE-7: Core Temperatures . . ..... ..... .......... ...34-165 34-99 Case 3BE-7: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-166 O

Revision: 9 April 11,1997 3 W85tingh0USB cAap600;prairev.9pra-lof.wpf;1b lxiv

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LIST OF FIGURES (Cont.)

Fleure No. Title Pege 34-100 Case 3BE-7: Loop Compartment and Valve Vault Water Levels . . . . . . . .34-167 34-101 Case 3BE-7: Containment Pressure . . . . . . . . . .... ......... . . . .34-168 34-102 Case 3BE-7: Gas Flow Rate Through Containment Failure Location . . . . . .34-169 34 103 Case 3BE-7: Containment Temperatures ........................ .34-170 34-104 Case 3BE-7: Debris Mass . .. ...................... .. ....34-171 34-105 Case 3BE-7: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-172 34-1 M Case 3BE-7: Hydrogen Generation . . . ..... .............. . . . .34-173 34-107 Case 3BE-7: Mass of Csl Released to Containment . .... ..........34-174 34-108 Case 3BE-7: Noble Gases Released . . . . . . . . . . ..................34-175 34-109 Case 3BE-7: Releases to Environment . . . . . . . . . . . . . . . . . . . . . . . . . . .34-176 34-110 Case 3BE-7: Non-Volatile Release . . ........ . . . . . . . . . . . . . . . . . 34- 177 34-111 Case 3BE-8: RCS Pressure and SG Pressure ................ . . . . .34-178 34-112 Case 3BE-8: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . . . . . . . . . .34-179 ,34-113 Case 3BE-8: Accumulator Water Mass and CMT Water Mass . . . . . . . . . 34 180 34-114 Case 3BE-3: IRWST Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-181  ;34-115 Case 3BE-8: Break Flows . . . . . . . . .............. ....... ...34-182 34-116 Case 3BE-8: Reactor Vessel Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-183 g 34-117 Case 3BE-8: Core Temperatures . . . . . . . .. .. . . . . . . . . . . . . . . . . . 34- 184 l

("} Case 3BE-8: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-185 34-118 34-119 Case 3BE-8: Loop Compartment and Valve Vault Water Levels . . . . . . . .34-186 34-120 Case 3BE-8: Containment Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-187 34-121 Case 3BE-8: Gas Flow Rate Through Containment Failure Location . . . . . .34-188 l 34-122 Case 3BE 8: Containment Temperatures ................... . . . . .34-189 I 34-123 Case 3BE-8: Debris Mass ....................... . . . . . . . . . . . 34- 190 34-124 Case 3BE-8: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-191 34-125 Case 3BE-8: Hydrogen Generation . . . . .. . . . . . . . . . . . . . . . . . . . . . 34- 192 34-126 Case 3BE-8: Mole Fraction Hydrogen in Valve Vault ........... . . . .34-193 34 127 Case 3BE-8: Mass of Cs1 Released to Containment . . . . . .. . . . . . . . . .34-194 34-128 Case 3BE-8: Noble Gases Released . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34- 195 34-129 Case 3BE-8: Releases to Environment . . . . . . . . . . . . . . . . . . . . ......34-196 34-130 Case 3BE-8: Non-Volatile Release . . . . . . . . . . . .. .. . .. . . . . .34-197 34-131 Case 3BE-9: RCS Pressure and SG Pressure ..... . . . . . . . . . . . . . . . 34- 19 8 34-132 Case 3BE-9: Loop 1 ADS Stage 4 Flows . . . . . . . ........ . . . . . .34-199 34-133 Case 3BE-9: Accumulator Water Mass and CMT Water Mass . . . . . . . . . .34-200 34-134 Case 3BE-9: IRWST Flows .... ......... ... ... . .......34-201 34-135 Case 3BE-9: Break Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....34-202 34-136 Case 3BE-9: Reactor Vessel Levels . . . . . ........... ...... ....34-203 34-137 Case 3BE-9: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-204 l

34-138 Case 3BE-9: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-205 34-139 Case 3BE-9: Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-206 34-140 Case 3BE-9: Containment Pressure . . . . . . . . ........... ....... .34-207 A

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Revision: 9 ENEL y Westinghotise Gh=- April 11,1997 g,wyp.ior wpu t>

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LIST OF FIGURES (Cont.)

8 1

Firure No. Title _P_ age 34-141 Case 3BE-9: Gas Flow Rate Through Containment Failure Location . . . ..34-208 34-142 Case 3BE-9: Containment Temperatures .. ........ .............34-209 34-143 Case 3BE-9: Debris Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-210 34-144 Case 3BE-9: Reac ar Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-211 34-145 Case 3BE-9: Hydrogen Generation . . . . . . .................. ...34-212 34-146 Case 3BE-9: Mole Fraction Hydrogen in Valve Vault . . . . . . . . . . . ....34-213 34-147 Case 3BE-9: Mass of Csl Released ot Containment . . ...............34-214 34-148 Case 3BE-9: Noble Gases Release .......... ..................34-215 34-149 Case 3BE-9: Releases to Environment . . . . . . . . . . . . . . . . . . . . . . . . . .34-216 34-150 Case 3BE-9: Non-Volatile Release . . . . . . . . ...... ....... ....34-217 34-151 Case 3BE-10: RCS Pressure and SG Pressure . . . . . . . . . ...... . . . . .34-218 34-152 Case 3BE-10: Loop 1 ADS Stage 4 Flows . . . . . . . . . .... .........34-219 34-153 Case 3BE-10: Accumulator Water Mass and CMT Water Mass ....... .34-220 34-154 Case 3BE-10: IRWST Flows . . . .......... ..................34-221 34-155 Case 3BE-10: Break Flows . . . . . . . . . . . ... .............. ...34-222 34-156 Case 3BE-10: Reactor Vessel Levels . . . . .... .. .. ........ ...34-223 34-157 Case 3BE-10: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-224 34-158 Case 3BE-10: Reactor Cavity Water Level and IRWST Water Level . . . . .34-225 34-159 Case 3BE-10: Loop Compartment and Valve Vault Water Levels . . . . . . .34-226 34-160 Case 3BE-10: Containment Pressure . . . . . .. ... ... ....... .. .34-227 34-161 Case 3BE-10: Containment Temperatures . . . . . . . . . ... ..........34-228 34-162 Case 3BE-10: Debris Mass . . . . . . . . . . . . . . . . . . ..............34-229 34-163 Case 3BE-10: Reactor Vessel-to-Cavity Water Heat Transfer . , . . . . . . . . .34-230 34-164 Case 3BE-10,: Hydrogen Generation .............. ........ ....34-231 34-165 Case 3BE-10: Mole Fraction Hydrogen in Valve Vault ...............34-232 34-166 Case 3BE-10: Mass of Csl Released to Containment . .......... .34-233 34-167 Case 3BE-10: Noble Gases Released . . . . . . . . . . . . . . ....... ....34-234 34-168 Case 3BE-10: Releases to Environment . . . . . .. . . . ...........34-235 34-169 Case 3BE-10: Non-Volatile Release ....... .... .......... ....34-236 34-170 Case 3BE-10: Gas Flow Rate Through Containment Failure Location ...34-237 34-171 Case 3BL-1: RCS Pressure and SG Pressure ... . . . . . . . . . . . . . . . . . 34-23 8 34-172 Case 3BL-1: Loop 1 ADS Stage 4 Flows . . . .....................34-239 34-173 Case 3BL-1: Accumulator Water Mass and CMT Water Mass ... ......34-240 34-174 Case 3BL-1: IRWST Flows . . . . ............. ... .... .. ...34-241 34-175 Case 3BL-1: Break Flows . ...... .. ..... ... ..... ...34-242 34-176 Case 3BL-1: Reactor Vessel Levels . . . . . ... . .. . . .........34-243 34-177 Case 3BL-1: Core Temperatures . . ........... . .. ..... ....34-244 34-178 Case 3BL-1: Reactor Cavity Water Level and IRWST Water Level . ....34-245 34-179 Case 3BL-1: Loop Compartment and Valve Vault Water Levels . . . .. ..34-246 4 34-180 Case 3BL-1: Containment Pressure . . . . ......... . ...........34-247 O

Ap i ,1997 [ Westingh00S8 oMp600\ prs \rev 9\pra-lof.wpfab lXvi j

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( )

U LIST OF FIGURES (Cont.)

Fiore No. Title Page 34-181 Case 3BL-1: Containment Temperatures ..... ....................34-248 34-182 Case 3BL-1: Debris Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-24 9 34-183 Case 3BL-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-250 34-184 Case 3BL-1: Hydrogen Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-251 34-185 Case 3BL-1: Mass of Csl Released to Containment . . . . . . . . . . . ......34-252 34-186 Case 3BL-1: Noble Gases Released . . . . . . . . . . . . . . . ....... .....34-253 34-187 Case 3BL-1: Releases to Environment . . . . . . . . . . . . . . . ..........34-254 34-188 Case 3BL-1: Non-Volatile Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 255 34-189 Case 3BL-1: RCS Pressure and SG Pressure ............. ........34-256 34-190 Case 3BL-2: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . ..........34-257 34-191 Case 3BL-2: Accumulator Water Mass and CMT Water Mass . . . . . . . . . .34-258 34-192 Case 3BL-2: IRWST Flows . . . . . . . . . .........................34-259 34-193 Case 3BL-2: Break Flows . . . . . . . .......................... .34-260 34-194 Case 3BL-2: Reactor Vessel Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-261 34-195 Case 3BL-2: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-262 34-196 Case 3BL-2: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-263 34-197 Case 3BL-2: Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-264 34-198 Case 3BL-2: Containment Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-265 t

b] 3A199 34-200 Case 3BL-2: Containment Temperatures . . . . . . . . . . . . . . . . . .......34-266 Case 3BL-2: Debris Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 267 34-201 Case 3BL-2: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-268 34-202 Case 3BL-2: Hydrogen Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-269 34-203 Case 3BL-2: Mass of Csl Released to Containment . . . . . . . . . . . . . . . . .34-270 34 204 Case 3BL-2: Noble Gases Released . . . . . . . . . . . . . . . . . . ..........34-271 34-205 Case 3BL-2: Releases to Environment . . . . . . . . . . . . . . . . . . . . . . . . . . .34-272 34 206 Case 3BL-2: Non-Volatile Release . . . . . . . . . . . . . . . . . . ..........34-273 34-207 Case 3BL-3: RCS Pressure and SG Pressure .... ..................34-274 34-208 Case 3BL-3: Loop 1 ADS Stage 4 Flows . . . . . . . ........ ........34-275 34-209 Case 3BL-3: Accumulator Water Mass and CMT Water Mass . . .......34-276 34-210 Case 3BL-3: IRWST Flows . . . . . . . ...................... ...34-277 34-211 Case 3BL-3: Break Flows . . .................... ...........34-278 34-212 Case 3BL-3: Reactor Vessel Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-279 ,34-213 Case 3BL-3: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-280 l 34-214 Case 3BL-3: Reactor Cavity, Water Level and IRWST Water Level . . . . . . .34-281 )34-215 Case 3BL-3: Loop Compartment and Valve Vault Water levels . . . . . . . . .34-282 34 216 Case 3BL-3: Containment Pressure .............................34-283 34-217 Case 3BL-3: Gas Flow Rate Through Containment Failure Location . . . . . .34-284  !

L 34-218 Case 3BL-3: Containment Temperatures .............. ........ .34-285 l l 34-219 Case 3BL-3: Debris Mass ...................................34-286 34-220 Case 3BL-3: Reactor Vessel-to-Cavity Water Heat Transfer . . . . .......34-287 34-221 Case 3BL-3: Hydrogen Generation . . . . . ........................34-288 m

(v I ENE Revision: 9 3 Westinghouse r&= 6 April 11,1997 b;yij c:\np600$rairev.9%pra-lof.wpf:lb

m .-

$ l LIST OF FIGURES (Cont.)

0 Firure No. Title Page 34-222 Case 3BL-3: Mole Fraction Hydrogen in Valve Vavit . . . . . . . . . . . . . . . .34-289 34-223 Case 3BL-3: Mass of CsI Released to Containment . . . . . . . . . . . . . . ...34-290 34-224 Case 3BL-3: Noble Gases Released . . . . . . . . . . . . . . . . . . . . . . . . . . ..34-291 34-225 Case 3BL-3: Releases to Environment . . . . . . . . . . . . . . . . . . . . . . . . . .34-292 34-226 Case 3BL-3: Non-Volatile Release ..... .......................34-293 34-227 Case 3BR-1: RCS Pressure and SG Pressure ......................34-294 34-228 Case 3BR-1: Loop 1 ADS Stage 4 Flows ................... ....34-295 34-229 Case 3BR-1: Accumulator Water Mass and CMT Water Mass . . . . . . . . . .34-296 34-230 Case 3BR-1: IRWST Flows . . . . . . . . . . . . . . . . . . ..............34-297 34-231 Case 3BR-1: B reak Flows . . . . . . . . . . . . . . . . . . . . ..............34-298 34-232 Case 3BR-1: Reactor Vessel Levels . . . . . . . . . . . . . . .......... ...34-299 34-233 Case 3BR-1: Core Temperatures . . . . . . . . . . . . . . . . ............. .34-300 34-234 Case 3BR-1: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-301 34-235 Case 3BR-1: Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-302 34-236 Case 3BR-1: Containment Pressure . . . .........................34-303 34-237 Case 3BR-1: Containment Temperatures ................. .. .34-304 34-238 Case 3BR-1: Debris Mass . . . . . . . . . . ... .. . . . . . . . . . . . . . . . . . 34-3 05 34-239 Case 3BR-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-306 34-240 Case 3BR-1: Hydrogen Generation . . . . . . . . . . . . . . . . . . . . . . . . . ...34-307 34-241 Case 3BR-1: Mass of Csl Released to Containment . . . . . . . . . . . . . . . . . .34-308 34-242 Case 3BR-1: Noble Gases Released . . . . . . . . . . . . . .. . . . . . . . . . . .34-309 34-243 Case 3BR-1: Releases to Environment . . . . . ... . . . . . . . . . . . . . . . . .34-310 34-244 Case 3BR-1: Non-Volatile Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-311 34-245 Case 3C-1: RCS Pressure and SG Pressure . . . . . . . . . . . . . . . . . . . . . . . .34-312 34-246 Case 3C-1: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . . . . . ......34-313 34-247 Case 3C-1: Accumulator Water Mass and CMT Water Mass ....... . .34-314 34-248 Case 3C-1: IRWST Flows . . . . . . . . ................... ......34-315 34-249 Case 3C-1: Break Flows . . . . . .......... .... ........ . . . . .34-316 34-250 Case 3C-1: Reactor Vessel Levels . . . . . ................ .......34-317 34-251 Case 3C-1: Core Temperatures ...... ......... .... . . . . . . . . .34-318 34-252 Case 3C-1: Reactor Cavity Water Level and IRWST Water Level . . . . ...34-319 34-253 Case 3C-1: Loop Compartment and Valve Vault Water Levels . . . . ..34-320 34-254 Case 3C-1: Containment Pressure . .... .. . . ......... . .34-321 34-255 Case 3C-1: Containment Temperatures ......... . . . . . . . . . . . . .34-322 34-256 Case 3C 1: Debris Mass . ................... ....... ...34-323 34-257 Case 3C-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-324 34-258 Case 3C-1: Hydrogen Generation . .... ...... .. ...... ......34-325 34-259 Case 3C-1: Mass of CsI Released to Containment . . ......... ......34-326 34-260 Case 3C-1: Noble Gases Released . . . . . . . .... . .... .........34-327 34-261 Case 3C-1: Releases to Environment . . . . . . . . . . .. ..... ..... .34-328 Revision: 9 9

ENEl. T Westinghouse April 11,1997 mih owaccawv>praaof3rub lxviii

O M

U LIST OF FIGURES (Cont.)

Fleure No. Title Page 34-262 Case 3C-1: Non-Volatile Release .......... . . . ... .... . .34-329 34-263 Case 3D-1: RCS Pressure and SG Pressure ............... ... ...34-330 34-264 Case 3D-1: Loop 1 ADS Stage 4 Flows .. .......................34-331 34-265 Case 3D-1: Accumulator Water Mass and CMT Water Mass . ... ...34-332 34-266 Case 3D-1: IRWST Flows . ................ .. ... ....... .34-333 34-267 Case 3D-1: Break Flows .. ............. . .......... . . . .34-334 34-268 Case 3D-1: Reactor Vessel Levels . . . . . . ... ............. ...34-335 34-269 Case 3D-1: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . ....34-336 34-270 Case 3D-1: Reactor Cavity Water T.evel and IRWST Water Levels ......34-337 34-271 Case 3D-1: Loop Compartment and Valve Vault Water Levels . . . . . . . . . .34-338 34-272 Case 3D-1: Containment Pressure . . . . .......... . . . . .34-339 34-273 Case 3D-1: Co itainment Temperatures ......... ... .. . .... ..34-340 34-274 Case 3D-1: Debris Mass . . . . .... ........ ... ... ....34-341 34-275 Case 3D-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . ..... .34-342 34-276 Case 3D-1: Hydrogen Generation . . . . . . . . .. .. ... . ........34-343 34-277 Case 3D-1: Mass of Csl Released to Containment .. ...... ....34-344 34-278 Case 3D-1: Noble Gases Released . . . . . . ... .. . . .. ...... .34-345 34 279 Case 3D-1: Releases to Environment . . . . . ....... .. . . . . . . . . .34-346 g) i 34-280 Case 3D-1: Non-Volatile Release . . . . . . . . . . . . .... ........ .34-347 V 34-281 Case 3D-2: RCS Pressure and SG Pressure ...... .. ... . . . . . . . . . 34-34 8 34-282 Case 3D-2: Loop 1 ADS Stage 4 Flows .. ..... ........ .......34-349 34 283 Case 3D-2: Accumulator Water Mass and CMT Water Mass . . . . . . . . . . .34-350 34-284 Case 3D-2: IRWST Flows . . . . . . . . . . ... .... ....... ... . .34-351 34-285 Case 3D-2: Break Flows . . . ............... . . . . . . . . . . . . . . 34-3 5 2  !34-286 Case 3D-2: Reactor Vessel Levels . . . . . . . ................. ....34-353 l 34-287 Case 3D-2: Core Temperatures . . ... .. .. .... . . ... .. .34-354 I 34-288 Case 3D-2: Reactor Cavity Water Level and IRWST Water Level ......34-355 34-289 Case 3D-2: Loop Compartment and Valve Vault Water Levels . . . . .. ..34-356 34-290 Case 3D-2: Containment Pressure . . . . . ... ..... . .. . ...34-357 34-291 Case 3D-2: Gas Flow Rate 'Ihrough Containment Failure Location . . . .34-358 34-292 Case 3D-2: Containment Temperatures .... ... ..... ......... .34-359 34-293 Case 3D-2: Debris Mass .............. . .... .. . .. .. .34-360 l 34-294 Case 3D-2: Reactor Vessel-to-Cavity Water Heat Transfer . ........ .34-361  !34-295 Case 3D-2: Hydrogen Generation . . . . . . . . . . . . . . . ........... .34-362 l 34-296 Case 3D-2: Mole Fraction Hydrogen in Valve Vault . . . . . . . . .. .34-363 34-297 Case 3D-2: Mass of Csl Released to Containment .... . . .. . .34-364 34-298 Case 3D-2: Noble Gases Released . . . . . . . . . . . . ........ ..34-365 34-299 Case 3D-2: Releases to Environment . ........ . . .... .... ..34-366

!34-300 Case 3D-2: Non-Volatile Release . .... . ... ..... ...... .34-367 34-301 Case 6E 1: RCS Pressure and SG Pressure . . . . . . . . .. . . . .34-368 34-302 Case 6E-1: Passive RHR Heat Removal .. . .. .... .. ..... .34-369 O)

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ENEL Revision: 9 Y W85tingh0USS ';;,it0llL=.

, April 11,1997 IXiX o Aap600\pra\rev_9'pra-lof.wpf:I b l

L

Es i

LIST OF FIGURES (Cont.)

O Firure No. Title Pa_ge 34-303 Case 3D-1: Break Flows . . . . . . . . . . . . . . . . . . . . . ........ . ...34-370 34-304 Case 3D-1: Liquid and Steam Flows through Failed-Open SG Safety Valve .34-371 34-305 Case 3D-1: Loop 1 ADS Stage 4 Flows ....................... .34-372 34-306 Case 3D-1: Accumulator Water Mass and CMT Water Mass . . . . . . . . . . .34-373 34-307 Case 3D-1: IRWST Flows . . . . . . . . . . . . . . . . . . . . .. ...........34-374 34-308 Case 3D-1: Reactor Vessel Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-375 34-309 Case 3D-1: Core Temperatures . . . . . . . . . . . ....................34-376 34-310 Case 3D-1: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-377 34-311 Case 3D-1: Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-378 34-312 Case 3D-1: Containment Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-379 34-313 Case 3D-1: Containment Temperatures ... ........... .. . . . . . . .34-380 34-314 Case 6E-1: Debris Mass ............ ...... ... . . . . . . . . . . . 34-3 81 34-315 Case 6E-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . 34-3 82 34-316 Case 6E-1. Hydrogen Generation . . . . ....................... .34-383 34-317 Case 6E-1: Mass of Csl Released to Containment . .. . .. . . . . . . . . . 34-3 84 34-318 Case 6E-1: Noble Gases Released . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-385 34-319 Case 6E-1: Releases to Environment . . . ................... . . . .34-386 34-320 Case 6E-1: Non-Volatile Release .... ................... . . . . .34-387 34-321 Case 6E-2: RCS Pressure and SG Pressure . . . . . . . . . . . . . . . . . . . . . . . 34 388 34-322 Case 6E-2: Passive RHR Heat Removal . . . . . . . . . . . ..... . . . . . . . .34-389 34-323 Case 6E-2: Break Flows . .............. .............. ....34-390 34-324 Case 6E-2: Liquid and Steam Flows through Failed-Open SG Safety Valve .34-391 34-325 Case 6E-2: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . ............ .34-392 34-326 Case 6E-2: Accumulator Water Mass and CMT Water Mass . . . . . . . . . . .34-393 34 327 Case 6E-2: IRWST Flows . . . . . . . . . . .................. .....34-394 34-328 Case 6E-2: Reactor Vessel I.evels . . . . . . . . . . . .. .... . . . . . . . . .34-395 34 329 Case 6E-2: Core Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-396 34-330 Case 6E-2: Reactor Cavity Water Level and IRWST Water Level . . . . . . . 34 397 34-331 Case 6E-2 Loop Compartment and Valve Vault Water Levels . . . . . . . . .34-398 34-332 Case 6E-2: Containment Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-399 34-333 Case 6E-2: Containment Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . .34-400 34-334 Case 6E-2: Debris Mass ......... ...... . . . . . . . . . . . . . . . . . . .34-401 34-335 Case 6E-2: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . . .34-402 34-336 Case 6E-2: Hydrogen Generation ................... .... . . . . .34-403 34-337 Case 6E-2: Mass of Csl Released to Containment . . . . . . . . . . . . . . . . . .34-404 34-338 Case 6E-2: Noble Gases Released . . . . .................. .. ...34-405 34-339 Case 6E-2: Releases to Environment . . . . . . . . . . . . . . . . . . . . . . . . . . .34-406 34-340 Case 6E-2: Non-Volatile Release ............. . . . . . . . . . . . . . . . . 34 407 34-341 Case 6E-3: RCS Pressure and SG Pressure . . . . . . . . . . . . . . . . . . . . . . .34-408 34-342 Case 6E-3: Passive RHR Heat Removal . . . . . . . . . . . ...... . . ..34-409 Revision: 9 ENEL April 11,1997 gu.g:n 3 W8Stinghouse o:\ap60opaVev.9Wlof.wpf.lb lxx

E l

O n

v LIST OF FIGURES (Cont.)

Figure No. Title Page 34-343 Case 6E-3: B reak Flows . . . . . . . . . . . . . . . . . . . . . ...............34-410 34-344 Case 6E-3: Liquid and Steam Flows through Failed-Open SG Safety Valve .24-411 34-345 Case 6E-3: Loop 1 ADS Stage 4 Flows . . . . . . ........... .......34-412 34-346 Case 6E-3: Accumulator Water Mass and CMT Water Mass .. . . . . . . .34-413 34-347 Case 6E-3: IRWST Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .34-414 34-348 Case 6E-3: Reactor Vessel Levels .......... ...................34-415 34-349 Case 6E-3: Cote Temperatures . . . . . . . . . . ............ ........34-416 34 350 Case 6E-3: Reactor Cavity Water Level and IRWST Water Level . . . ...34-417 34-351 Case 6E-3: Loop Companment and Valve Vault Water Levels . . . . . . ...34-418 34-352 Case 6E-3: Containment Pressure . . . . . . . . ........... .........34-419 34-353 Case 6E-3: Containment Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . .34-420 34-354 Case 6E-3: Debris Mass ...... ................... .. . . . .34-421 34-355 Case 6E-3: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . .34-422 34-356 Case 6E-3: Hydrogen Generation . ................ . .. .34-423 34-357 Case 6E-3: Mass of Csl Released to Containment . . ................34-424 34-358 Case 6E-3: Noble Gases Released . . ................. . ... ..34-425 34-359 Case 6E-3: Releases to Environment . . . . . .......................34-426 34-360 Case 6E-3: Non-Volatile Release ...... ......... . .. . . . . . . 34 427 34-361 Case 6L-1: RCS Pressure and SG Pressure . . . . . . . . . . . . . . .34-428

[V_T 1

34-362 Case 6L-1: Loop 1 ADS Stage 4 Fjows . . . . . .............. . . . . .34-429 34-363 Case 6L-1: Break Flows . . . ....... .... ....................34-430 34-364 Case 6L-1: Liquid and Steam Flows through Failed-Open SG Safety Valve .34-431 34 365 Case 6L-1: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . . . . . . . . . . .34-432 34-366 Case 6L-1: Accumulator Water Mass and CMT Water Mass ....... ...34-433 34-367 Case 6L-1: IRWST Flows . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . 34-4 34 34-368 Case 6L-1: Reactor Vessel Levels . . . . . ................. .... .34-435 34-369 Case 6L-1: Core Temperatures . . .... .. ............ . . . . . . .34-436 34-370 Case 6L-1: Reactor Cavity Water Level and IRWST Water Level . . . . . . .34-437 34-371 Case 6L-1: Loop Companment and Valve Vault Water Levels . . . . . . . . .34-438 34-372 Case 6L-1: Containment Pressure . . . . . . . . . . ......... .. . . . .34-439 34-373 Case 6L-1: Containment Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . .34-440 34-374 Case 6L-1: Debris Mass ............................. .... .34-441 34-375 Case 6L-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . ... ...34-442 34-376 Case 6L-1: Hydrogen Generation . . . . . . . . . . .... ......... ...34-443 34-377 Case 6L-1: Mass of Csl Released to Containment . . . . . . . . . . . . . . . . . . .34-444 34-378 Case 6L-1: Ncble Gases Released . . .... . ............ ........34-445 34-379 Case 6L-1: Releases to Environment . . . ............... ........34-446 34-380 Case 6L-1: Non-Volatile Release . ..... ........... ...........34-447 34-381 Case 1 AP-1: RCS Pressure and SG Pressure .. ............... ..34-448 l 34-382 Case 1AP-1: Passive RHR Heat Removal ... .... .... . ..34-449

!34-383 Case I AP-1: Break Flows . . . . . ...................... . . . . . .34-450 i

C ..

ENEl. Revision: 9 T Westinghouse cath. April 11,1997 IXXi o:\ap600\pra\rev_9\pra-lof.wpf:1b L - - _ -_ _

.-ga,,.o l LIST OF FIGURES (Cont.)

0 Firure No. Title Page 34-384 Case 1 AP-1: Liquid and Steam Flows through Failed-Open SG Safety Valve .34-451 34-385 Case 1 AP-1: Loop 1 ADS Stage 4 Flows . . . . . . . . . . . . . .......... .34-452 34-386 Case 1 AP-1: Accumulator Water Mass and CMT Water Mass . . . . . . . ..34-453 34-387 Case 1 AP-1: IRWST Flows . ............ . . . . . . . . . . . . . . . . . . 34-4 54 34-388 Case 1 AP-1: Reactor Vessel Levels . . . . . . . ...... . . . . . . . . . . . . . 34-4 55 34 389 Case 1 AP-1: Core Temperatures . . . . . . . . . . . . ................ .34-456 34-390 Case 1 AP-1: Reactor Cavity Water Level and IRWST Water Level . . . . . .34-457 34-391 Case I AP-1: Loop Compartment and Valve Vault Water Levels . . . ...34-458 34-392 Case 1 AP-1: Containment Pressure . . . . . . . . . . . . .. .. .. .... ..34-459 34-393 Case 1AP-1: Containment Temperatures ........ . .. . . . .. .34-460 34-394 Case 1 AP-1: Debris Mass ...... . ......... . ..... . . . . .34-461 34-395 Case 1AP-1: Reactor Vessel-to-Cavity Water Heat Transfer . ... ... ..34-462 34-396 Case 1 AP-1: Hydrogen Generation . . . . . . ... ... . ... ....34-463 34-397 Case 1 AP-1: Mass of Csl Released to Containment . . . . . . . . . . . . .... .34-464 34-398 Case 1 AP-1: Noble Gases Released . .. ........... .... ... .34-465 34-399 Case 1 AP-1: Releases to Environment . . . . . .... . . . ... ... .34-466 34-400 Case 1 AP-1: Non-Volatile Release . ... . . .. .. . . ...34-467 34-401 Case I A-1: RCS Pressure and SG Pressure ..... ... . .... . . . . .34-468 34-402 Case 1 A-1: Passive RHR Heat Removal . . . . . . ..... . ....... ...34-469 34-403 Case IA-1: Break Flows . ... .............. ... ...... ...34-470 34-404 Case I A-1: Liquid and Steam Flows through Failed-Open SG Safety Valve .34-471 34-405 Case 1 A-1: Loop 1 ADS Stage 4 Flows . . .. .... .... . .. .34-472 34-406 Case 1 A-1: Accumulator Water Mass and CMT Water Mass .... . .. .34-473 34-407 Case 1 A-1: IRWST Flows . . . .. ............ .......... ..34-474 34-408 Case I A-1: Reactor Vessel Levels . . . ....... ... ......... .34-475 34-409 Case I A.1: Core Temperatures . . . . ........ .. .. ......... . .34-476 34-410 Case I A-1: Reactor Cavity Water Level and IRWST Water Level . . . . ...34-477 34-411 Case I A-1: Loop Companment and Valve Vault Water Levels . . . . . . . ..34-478 34-412 Case I A-1: Containment Pressum . . . . . . . . . . . . .... . . . . . . . . . . .34-479 34-413 Case I A-1: Containment Temperatures .... ... . ..... . ..34-480 34-414 Case I A-1: Debris Mass . . ..... ........... . .. ..... .. .34-481 34-415 Case I A-1: Reactor Vessel-to-Cavity Water Heat Transfer . . . . . . . . . . . .34-482 34-416 Case 1 A-1: Hydrogen Generation . ...... ......... .... ... .34-483 34-417 Case I A-1: Mass of Csl Released to Containment . ..... ...... . .34-484 34-418 Case IA-1: Noble Gases Released . . . . . . . . .... .. . ......... .34-485 34-419 Case I A-1: Releases to Environment . . . . . . . . . . . . . . . . . . . . . . . . . .34-486 34-420 Case 1 A-1: Non-Volatile Release ......... .... . ... .. . .34-487 35-1 Containment Event Tree . . ..... ............ .. .. ..... . . . 35-30 Revision: 9 0

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1 l

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s l

LIST OF FIGURES (Cont.)

Figure No. Title Page 36-1 AP600 Accident Class I A Base Case for Node DP Success -- RCS Pressure . . . 36-8 36-2 AP600 Accident Class I A Base Case for Node DP Success -- Core.

Exit Gas Temperature . . . ... ..... .. ... . ... . . ....... 36-9 36-3 AP600 Accident Class I A Base Case for Node DP Success -- Steam Generator Tube Creep Damage ......... ... ................ . 36-10 38-1 AP600 DVI Break with Valve Vault Flooding Containment

. I Compartment Water Levels . ..... .. .................... . . . 38-7 39-1 Mini ACOPO Bowl for Testing . . . . . ....... ...... ... .... . 39-17 39-2 ACOPO Testing Arrangement . . . . . . . . ....... ........ .... 39-18 39-3 ULPU Testing Arrangement ............................. . .. 39-19 39-4 AP600 Passive Core Cooling System . . . . ................ .. . .. 39-20 39-5 Containment Floodable Region . . . . . . . . . . . . . . . . . . . . . . ..... . . 39-21 39-6 Containment Floodable Region - Exploded View . ........... ... .. 39-22 39-7 AP600 Cavity Flooding Rate ........... .. .. ...... ... . .. 39-23 39-8 Schematic of Reactor Vessel and Insulation . . . . . . . ....... ......... 39-24 O

Q 39-9 ULPU Test Configuration . . . . . . . . . . . ............. ......... 39-25 40-1 AP600 Containment Schematic . . . ..............................40-3 40-2 AP600 Passive Containment Cooling ........... ....... . . . . . . . . 40-4 '

40-3 Containment Pressure Prediction .................................40-5 41-1 Combustion Cornpleteness for Nevada Test Site Premixed Combustion Tests (Reproduced from Ref. 41-3) . . . . . . . . . . .... . . 41-91 l 41-2 The Flammability Floor Domain for Upward Flame Propagation for H2-Air-H O2 (Vapor) Mixtures. The Flammability Limit ,

Curve is Superimposed on the Isobaric Controus of Calculated  !

Adiabatic Explosion Pressure (from Ref. 41 1$) . .......... ......... 41-92 j 41-3 ' Theoretical Adiabatic, Constant-Volume Combustion Pressures l of Hydrogen-air Mixtures (Reproduced from Ref. 41-5) ...... . . . . . . . . . 41 -93  ;

41-4 Typical Calculated Versus Measured Axial Power Distribution . . . . . . . . . . . . 41-94 j 41-5 Normalized Power Density Distribution Near Middle of Life, j Unrodded Core Hot Full Power, Equilibrium Xenon . . . . . . . . . . . ...... 41-95  !

41-6 Reactor Vessel Wa.er Level in AP600 Hydrogen Cases ........... . . 41 -% 1 41-7 Fraction of Cladding Reacted in AP600 Hydrogen Generation Cases ..... . 41-97 41-8 Containment Pressure for AP600 Hydrogen Cases . . . . . . . . . . . . . . . . . . . 41-98 41-9 AP600 Containment Water Level - DVI Line Break with No Valve Vault Flooding . . . . . . . . . .................... .. ... . 41-99 41-10 AP600 Containment Water Level - DVI Line Break with Valve Vault Flooding . ...... ......... . . . . . . . . . . . . . . . . . . . . . . . . 41 - 100 q Accident Class 3BE Early Detonation Decomposition Event Tree . ....41-101 41-11 .

I Revision: 10 l [ W65tif)ghouSE h_ ixxiii June 30,1997 04*Na*v iopr .iorwpr.:b

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LIST OF FIGURES (Cont.)

fjgpre No. This Page 41-12 Accident Class 3BL Early Detonation Decomposition Event Tree . . . . . . . . . 41 102 41-13 Accident Class 3BR/3C Early Detonation Decomposition Event Tree . ....41-103 41-14 Accident Class 3D/lD Early Detonation Decomposition Event Tree . . . . . . .41-104 41-15 Accident Class LAP Early Detonation Decomposition Event Tree . . . . . . . . .41-105 41-16 Detonation Cell Width versus Equivalence Ratio for Test Series #1 ,

(H 2-Air at P=1 atm. T=20*C) (Reproduced from Reference 41-4) . . . . . . . . .41-106 41-17 Detonation Cell Width versus Equivalence Ratio for Test Series #3. 4 (H 2-Air-H2 O at p,=41.6 moles /m', T=100*C) (Ref. 41-4) . . . . . . . . . . . . . .41-107 l 41-18 Detonation Cell Width versus Temperature Ratio for Test Series #6. 7 {

(H 2-Air at X,e=0.17) (Ref. 41-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-108 1 41-19 AP600 Adiabatic Shell Temperature for Hydrogen Burn . . . . . . . . . . . . . . .41-109 41-20 AP600 Hydrogen Deflagmtion Analysis - Non-Reflood Case Hydrogen Generation Probability Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 -110 41-21 AP600 Hydrogen Deflagration Analysis - Non-Reflooded Case Pre-Burn Pressure Probability Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 - 1 1 1 41-22 AP600 Hydrogen Deflagration Analysis - Non-Reflooded Case Probability Distribution of AICC Peak Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-112 41-23 AP600 Hydrogen Deflagration Analysis - Early-Reflood Case Hydrogen Generation Probability Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-113 41 24 AP600 Hydrogen Deflagration Analysis - Early-Reflood Case Pre-Bum Pressure Probability Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-114 41-25 AP600 Hydrogen Deflagration Analysis - Early Reflood Case Probability .

Distnbution of AICC Peak Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-115 41 26 AP600 Hydrogen Deflagration Analysis - Late-Reflood Case Hydrogen Generation Probability Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-116 41-27 AP600 Hydrogen Deflagration Analysis - Late-Reflood Case Pre Bum Pressure Probability Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-117 41-28 AP600 Hydrogen Deflagration Analysis - Late-Reflood Case Proability Distribution of AICC Peak Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-118 41-29 Reflooded 3BE Case - Lower Flammability Limit Sensitivity . . . . . . . . . .41-119 41-30 Reflooded 3BE Case - Steam Inerting Limit Sensitivity . . . . . . . . . . . . . .41-120 41-31 Accident Class 3BE Intermediate Detonation Decomposition Event Tree . . . .41-121 41-32 Accident Class 3BL Interrraxiiate Detonation Decomposition Event Tree . . . .41-122 41-33 Accident Class 3BR 3C, 3D LAP Intermediate Detonation Decomposition Event Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 - 123 42-1 AP600 Containment Fragility at Contamment Temperature of 400*F . . . . . . . 4213 42-2 AP600 Containment Fragility at Containment Temperature of 331*F . . . . . . . 42-14 43-1 Contribution of Accident Class to Large Release Frequency . . . . . . . . . . . . 43-15 2 43-2 Contribution of Cominant Containment Event Tree Sequences to Large Release Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3- 1 5 3 Apri *

,1997

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LIST OF FIGURES (Cont.)

Figure No. Title Eage 43-3 Containment Event Tree for 3BE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-154 43-4 Containment Event Tree for 3BL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-155 43-5 Containment Event Tree for 3BR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-156 43-6 Containment Event Tree for 1 A . . . . ......................... .43-157 43-7 Containment Event Tree for I AP . . . . . . . . . . . . ...................43-158 43-8 Containment Event Tree for 3A . . . . . . . ............ ... . . . . . . .43-159 43-9 Containment Event Tree for 3C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-160 43-10 Containment Event Tree for 3D ...... ... . .... . . . . . . . . . . .43-161 43-11 Containment Event Tree for 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-162 44-1 AP600 MAAP4 Containment Model Nodalization . . . . . . . . . . . . . . .... 44-12 45-1 Release Category IC Release Fraction Comparison Noble Gases . . ....... . 45-17 45-2 Release Category IC Release Fraction Comparison Csl . . . . . . . . . . . . . . . . 45-18 i 45-3 Release Category IC Release Fraction Comparison Non-Volatiles . . . . . . . . . 45-19 45-4 Case 3BE-4: IC 72-Hour Release Fraction Noble Gases (Xe, Kr) ..... ... 45-20 45-5 Case 3BE-4: IC 72-Hour P/ case Fraction Csl . . . .. ....... . . . . . . 45-21 l 45-6 Case 3BE-4: IC 72-Hour ;elea:e Fraction TeO 2 ........... ... . . 45-22

/ g)

, 45-7 Case 3BE-4: IC 72-Hour Release Fraction Non-Volatiles (SrO) .. . . . . . . . 4 5-23 i

V 45-8 Case 3BE-4: IC 72-Hour Release Fraction moo2 . . . . . . . . . . . . . . . . . . . 4 5-24 l 45-9 Case 3BE-4: IC 72-Hour Release Fraction CsOH . . . . ...... . . . . . . . 45-25  ;

45-10 Case 3BE-4: IC 72-Hour Release Fraction BaO . . .. ............... 45-26 45-11 Case 3BE-4: IC 72-Hour Release Fraction La,,0 3 .............. ... . 45-27 45-12 Case 3BE-4: IC 72-Hour Release Fraction CeO2 ........ .. ....... . 45-28  ;

45-13 Case 3BE-4: IC 72-Hour Release Fraction Sb . . . . . . . . . . . . . . . . . . . . . . 45-29 l 45-14 Case 3BE-4: 1C 72-Hour Release Fraction Te2 . . ................... 45-30 45-15 Case 3BE-4: IC 72-Hour Release Fraction UO 2 . . . . . . . . . . . . . . . . . . . 4 5-31 45-16 Release Category BP Release Fraction Comparison Noble Gases . . . . . . . . . 45-32 45-17 Release Category BP Release Fraction Comparison Csl . . . . . . . . . . ..... 45-33 45-18 Release Category BP Release Fraction Comparison Non-Volatiles ......... 45-34 45-19 Case I A-1: BP 72-Hour Release Fraction Noble Gases (Xe, Kr) . . . . . . . . . . 45-35 l

45-20 Case I A-1: BP 72-Hour Release Fraction Csl . . . . . . . . . . . . . . . . . . . . . . 45-36 45-21 Case 1 A-1: BP 72 Hour Release Fraction TeO 2 . . . . . . . . . . . . . . ...... 45-37 45-22 Case I A-1: BP 72-Hour Release Fraction Non-Volatiles (SrO) . . . . . . . . . . . 45-38 l 45-23 Case IA-1: BP 72-Hour Release Fraction moo 2 ... . . . . . . . . . . . . . . . . 4 5-3 9 45-24 Case 1 A-1: BP 72-Hour Release Fraction CsOH . . . . . . . . . . . . . . . . . . . . 45-40 45-25 Case I A-1: BP 72-Hour Release Fraction Ba0 ...... ......... .. 45-41 45-26 Case I A-1: BP 72-Hour Release Fraction La2 03 ....... . . . . . . . . . . . . 4 5-42 45 27 Case I A-1: BP 72-Hour Release Fraction CeO 2 . . . . . . . . . . . . . . . . . . . . . 45-43 45-28 Case 1 A-1: BP 72-Hour Release Fraction Sb . . . . . . ..... ......... . 45-44 45-29 Case 1 A-1: BP 72-Hour Release Fraction Te2 ......... ...... ... . 45-45 T Westinghouse $k,,. Ap il 11, IXXv c:\ap60Wra\rev_9\pra-lof.wpf.lb i

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! LIST OF FIGURES (Cont.)

O l

l Firure No. Title Page 45-30 Case I A-1: BP 72-Hour Release Fraction UO2 ............... . . . . . 45-46 45-31 Case 3BE-5: Clair 72-Hour Release Fraction Noble Gases (Xe, Kr) . . . . . .. 45-47 45-32 Case 3BE-5: Clair 72-Hour Release Fraction Csl . . . . . . . . .. ..... . 45-48 45-33 Case 3BE-5: Clair 72-Hour Release Fraction TeO 2 . . . . . . . . . . . . . . . . . . 4 5 -4 9 45-34 Case 3BE-5: Clair 72-Hour Release Fraction Non-Volatiles (SrO) . . . . .. 45-50 45-35 Case 3BE-5: Clair 72-Hour Release Fraction moo 2 . . . . . . . . . . . . . . . . . . 4 5-51 45-36 Case 3BE-5: Clair 72 Hour Release Fraction CsOH . ......... . . . . . 45-52 45-37 Case 3BE-5: Clair 72 Hour Release Fraction Ba0 . . . . . . ..... . . . . 45-53 45-38 Case 3BE-5: Clair 72-Hour Release Fraction La 2O3 ............. ... . 45-54 45-39 Case 3BE-5: Clair 72-Hour Release Fraction CeO2 . ..... ... .. . 45-55 45-40 Case 3BE-5: Clair 72-Hour Release Fraction Sb . .. .... .. . . . . 45-56 45-41 Case 3BE-5: Clair 72-Hour Release Fraction Te2 .............. .. . 45-57 45-42 Case 3BE-5: Clair 72-Hour Release Fraction UO 2 . .... . . .. . . . . 45-58 45-43 Release Category CFE Release Fraction Comparison Noble Gases . . . . . . . . 45-59 45-44 Release Category CFE Release Fraction Comparison CsI . . . . .... ... . 45-60 45-45 Release Category CFE Release Fraction Comparison Non-Volatiles ... . . . 45-61 45-46 Case 3BE-8: CFE 72-Hour Release Fraction Noble Gases (Xe, Kr) . . . . . . . 45-62 45-47 Case 3BE-8: CFE 72-Hour Release Fraction UO2 ......... . ..... . 45-63 45-48 Case 3BE-8: CFE 72-Hour Release Fraction TeO 2 ........ ... .. .. . 45-64 45-49 Case 3BE-8: CFE 72. Hour Release Fraction Non Volatiles (SrO) . . .. 45-65 45-50 Case 3BE-8: CFE 72-Hour Release Fraction moo2 ...... .... .. . . . 45-66 45-51 Case 3BE-8: CFE 72-Hour Release Fraction CsOH . . . . . . . . . . . . . . . . . . 45-67 45-52 Case 3BE-8: CFE 72-Hour Release Fraction BaO .......... .. ... . 45-68 45-53 Case 3BE-8: CFE 72-Hour Release Fraction La,,0 3 ....... .. . . . . . 45-69 45-54 Case 3BE-8: CFE 72-Hour Release Fraction CeO2 ........ . . . . . . . 45-70 45-55 Case 3BE-8: CFE 72-Hour Release Fraction Sb . . . . . . . . . . . . . . . . . . 45-71 45-56 Case 3BE-8: CFE 72-Hour Release Fraction Te2 .. ................ 45-72 45-57 Case 3BE-8: CFE 72-Hour Release Fraction UO2 ............... . . . 45-73 45-58 Release Category CFI Release Fraction Comparison Noble Gases . . . . . . .. 45-74 45-59 Release Category CFI Release Fraction Comparison Csl ... ....... . 45-75 45-60 Release Category CFI Release Fraction Comparison Non-Volatiles . . . . . . . . 45-76 45-61 Case 3BE-9: CFI 72-Hour Release Fraction Noble Gases (Xe, Kr) . ... . 45-77 45-62 Case 3BE-9: CFI 72-Hour Release Fraction Csl . .. ........ . . . . . . . 45-7 8 45-63 Case 3BE-9: CFI 72-Hour Release Fraction TeO2 ......... . . . . . . . . 45-79 45-64 Case 3BE-9: CFI 72-Hour Release Fraction Non-Volatiles (SrO) . . . . . . . . . 45-80 45-65 Case 3BE-9: CFI 72-Hour Release Fraction moo 2 . ... . . . . . . . 45-81 45-66 Case 3BE-9: CFI 72-Hour Release Fraction CsOH . . ...... . .. ... 45-82 45-67 Case 3BE-9: CFI 72-Hour Release Fraction BaO . . . . . . . . . ... . . . 45-83 45-68 Case 3BE-9: CFI 72-Hour Release Fraction2 La 3 0 . . . . . . . . . . . . . . . . . . 45-84 45-69 Case 3BE-9: CFI 72-Hour Release Fraction CeO2 .. ............. .. 45-85 45-70 Case 3BE-9: CFI 72-Hour Release Fraction Sb ........... . . .. 45-86 Revision: 9 9

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LIST OF FIGURES (Cont.)

Firure No. Title _P_ age 45-71 Case 3BE-9: CFI 72-Hour Release Fraction Te2 . . . . . . ... .......... 45-87 45-72 Case 3BE-9: CFI 72-Hour Release Fraction UO2 ....................45-88 45-73 Case 3BE-10: CFL 72-Hour Release Fraction Noble Gases (Xe, Kr) . . . . . 45-89 45-74 Case 3BE-10: CFL 72-Hour Release Fraction Csl . . . . . . . . . . . . . . .... 45-90 45-75 Case 3BE-10: CFL 72-Hour Release Fraction TeO 2 ............. . . . . 45-91 J 45-76 Case 3BE-10: CFL 72-Hour Release Fraction Non-Volatiles (SrO) . . . . . . . . 45-92

{

45-77 Case 3BE-10: CFL 72 Hour Release Fraction moo 2 ....... ....... . 45-93 45-78 Case 3BE-10: CFL 72-Hour Release Fraction CsOH . . . . . . . . ....... . 45-94 -

45-79 Case 3BE-10: CFL 72-Hour Release Fraction BaO . . . . .. ........ 45-95 45-80 Case 3BE-10: CFL 72-Hour Release Fraction 2 3 La 0 . . . . . . . . . ........ 45-96 45-81 Case 3BE-10: CFL 72.-Hour Release Fraction CeO2 ..... . . . . . . . . . . 4 5-97 45-82 Case 3BE-10: CFL 72-Hour Release Fraction Sb . . . . . . . . . . . . . . . . . . . 4 5-9 8 45-83 Case 3BE-10: CFL 72-Hour Release Fraction Te2 ............ ... .. 45-99 45-84 Case 3BE-10: CFL 72-Hour Release Fraction UO 2 . . . . . . . ... . . . .45-100 '

45-85 IC 72-Hour Direct Release Sensitivity Noble Gases (Xe, Kr) . . . . . . . . . . .45-101 45-86 IC 72-Hour Direct Release Sensitivity Csl . . . . . . . . ................45-102 ,

45-87 IC 72-Hour Direct Release Sensitivity TeO 2 . . . . . . . . . . . . . . . . . . . . . . 4 5 - 103 l

,, 45-88 IC 72-Hour Direct Release Sensitivity Non-Volatiles (SrO) .. . . . . . . . .45-104 j ) 45-89 IC 72-Hour Direct Release Sensitivity moo 2 ........ ..... . . . . .45-105 i l# ' -- 45 90 IC 72-Hour Direct Release Sensitivity CsOH . . . . ..................45-106 45-91 IC 72-Hour Direct Release Sensitivity BaO . . . . ... ....... . . . .45-107 45-92 IC 72-Hour Direct Release Sensitivity La,,03 . ....... .............45-108 45-93 IC 72-Hour Direct Release Sensitivity CeO 2 . . . . ...................45-109 45-94 IC 72-Hour Direct Release Sensitivity Sb . . . . . . . . . . . . . . . . . . . . . 4 5- 1 10 45-95 IC 72-Hour Direct Release Sensitivity Te2 ..... .......... . . . . . . . 45 111 45-96 IC 72-Hour Direct Release Sensitivity 'UO2 ........ ..... . . . . . . . .45-112 45-97 Case 3BE-4: FRPAT Sensitivity on Release Fraction Noble Gases . . . ...45-113 45-98 Case 3BE-4: FPRAT Sensitivity on Release Fraction CsI .............45-114 45-99 Case 3BE-4: FPRAT Sensitivity on Release Fraction TeO 2 ... . . . . . . .45-115 45-100 Case 3BE-4: FPRAT Sensitivity on Release Fraction SrO . . . . . . . . . . . .45-116 j 45-101 Case 3BE-4: FPRAT Sensitivity on Release Fraction moo2 .. ...... .45-117 45-102 Case 3BE-4: FPRAT Sensitivity on Release Fraction CsOH . . . . . . . . . . .45-118 45-103 Case 3BE-4: FPRAT Sensitivity on Release Fraction Ba0 . . . . . . . . . . . .45-119 45-104 Case 3BE-4: FPRAT Sensitivity on Release Fraction La 2O3 ... . .....45-120 ,45-105 Case 3BE-4: FPRAT Sensitivity or. Release Fraction CeO 2 . . . . . . . . . . . .45-121 45-106 Case 3BE-4: FPRAT Sensitivity en Release Fraction Sb . . . . . . . . . . . . . .45-122 l 45-107 Case 3BE-4: FPRAT Sensitivity on Release Fraction Te2 ..... . .....45-123 45-108 Case 3BE-4: FPRAT Sensitivity on Release Fraction UO2 . . ...........45-124 45-109 Case 3BE-4: FAERDC Sensitivity on Release Fraction Noble Gases .... .45-125 45-110 Case 3BE-4: FAERDC Sensitivity on Release Fraction Csl . . . . . ......45-126 45-111 Case 3BE-4: FAERDC Sensitivity on Release Fraction TeO 2 . . . . . . . . . . .45-127

)

(A)

%d Revision: 9 ENE T Westinghouse W- April 11,1997 1xxvii osp60@mwv.9m-ior.wpt:ib

F"$

LIST OF FIGURES (Cont.)

9 Figure No. Title hge 45-112 Case 3BE-4: FAERDC Sensitivity on Release Fraction SrO ............45-128 45-113 Case 3BE-4: FAERDC Sensitivity on Release Fraction moo 2 ..... . .45-129 45-114 Case 3BE-4: FAERDC Sensitivity on Release Fraction CsOH . . . . . . .45-130 45-115 Case 3BE-4: FAERDC Sensitivity on Release Fraction Ba0 . . . .......45-131 45-116 Case 3BE-4: FAERDC Sensitivity on Release Fraction La 2O3 ... . .45-132 45-117 Case 3BE-4: FAERDC Sensitivity on Release Fraction CcO2 .... ... .45-133 45-118 Case 3BE-4: FAERDC Sensitivity on Release Fraction Sb . . . . . . . ... .45-134

)

J 45-119 Case 3BE-4: FAERDC Sensitivity on Release Fraction Te2 . . . . . . . .. .45-135 45-120 Case 3BE-4: FAERDC Sensitivity on Release Fraction UO 2 ....... ...45-136 49-1 Population Whole Body Dose BP Source Term,24 Hours . ... . . . . . . . . 49-20 49-2 Population Whole Body Dose BP Source Term,72 Hours . . . . ........ . 49-20 49-3 Site Boundary Whole Body Dose BP Source Term,24 Hours .......... 49-21 49-4 Site Boundary Whole Body Dose BP Source Term,72 Hours .. .. . . . . 49-21 49-5 Site Boundary Red Bone Marrow Dose BP Source Term,24 Hours .. ... . 49 22 49-6 Site Boundary Red Bone Marrow Dose BP Source Term,72 Hours . . . . 49-22 49-7 Site Boundary Thyroid Dose BP Source Term,24 Hours . . . . . . . .. . . 49-23 49-8 Site Boundary Thyroid Dose BP Source Term,72 Hours . . . . . . . . . . . .. 49-23 49-9 Population Whole Body Dose CFE Source Term,24 Hours . . . . ....... . 49-24 49-10 Population Whole Body Dose CFE Source Term,72 Hours . . . . . . . . .... 49-24 49-11 Site Boundary Whole Body Dose CFE Source Term,24 Hours .... .. . 49-25 49-12 Site Boundary Whole Body Dose CFE Source Term,72 Hours . .. . . . 49-2S 49-13 Site Boundary Red Bone Marrow Dose CFE Source Term,24 Hours . .. . 49-26 49-14 Site Boundary Red Bone Marrow Dose CFE Source Term,72 Hours .... 49-26 49-15 Site Boundary Dyroid Dose CFE Source Tenu,24 Hours . . . . . . . . . . . . . . 49-27 49-16 Site Boundary Thyroid Dose CFE Source Term,72 Hours ...... . . . 49-27 49-17 Population Whole Body Dose CFI Source Term,24 Hours ... ....... . 49-28 49-18 Population Whole Body Dose CFI Source Term,72 Hours ...... .. . 49-28 49-19 Site Boundary Whole Body Dose CFI Source Term,24 Hours . . . . . . . . . . 49-29 49-20 Site Boundary Whole Body Dose CFI Source Term,72 Hours . ... ... 49-29 49-21 Site Boundary Red Bone Marrow Dose CFI Source Term,24 Hours . . . . . . 49-30 49-22 Site Boundary Red Bone Marrow Dose CFI Source Term,72 Hours . . .. 49-30 49-23 Site Boundary Byroid Dose CFI Source Term,24 Hours . . . . . . . . . . . 49-31 49-24 Site Boundary Byroid Dose CFI Source Tenn,72 Hours . . ..... .. 49 31 49-25 Population Whole Body Dose CFL Source Tenn,24 Hours . . . . . . . . . 49-32 49-26 Population Whole Body Dose CFL Source Term,72 Hours . . . . . ... . 49-32 49-27 Site Boundary Whole Body Dose CFL Source Term,24 Hours ....... .. 49-33 49-28 Site Boundary Whole Body Dose CFL Source Term,72 Hours ...... . 49-33 49-29 Site Boundary Red Bone Marrow Dose CFL Source Term,24 Hours . . . . 49-34 49-30 Site Boundary Red Bone Marrow Dose CFL Source Term,72 Hours .. . 49-34 49-31 Site Boundary Dyroid Dose CFL Source Term,24 Hours . . . . ..... . . 49-35 O

Revision: 9 ENEL mh Westinghouse April 11,1997 owanpovevym or.wprJb a lxxviii

1 I

D (V

LIST OF FIGURES (Cont.)

1 Figure No. Title _P_ age 49-32 Site Boundary Thyroid Dose CFL Source Term,72 Hours . . . . . .. . . . . . 49-35 1 49-33 Population Whole Body Dose CI Source Term,24 Hours ...... . . . . . . . 49-36 l 49-34 Population Whole Body Dose CI Source Term,72 Houn ... ...... . . 49-36 49-35 Site Boundary Whole Body Dose CI Source Term. 24 Hours . . . . . . . . . . . . 49-37 49-36 Site Boundary Whole Body Dose CI Source Term,72 Hours . . .. . . . . . . 49-37 49-37 Site Boundary Red Bone Marrow Dose Ci Source Term,24 Hours . . . . . . . 4 9-3 8 j 49-38 Site Boundary Red Bone Marrow Dose CI Source Term,72 Hours . . . . . . . 49-38 i 49-39 Site Boundary Thyroid Dose CI Source Term,24 Hours .... . . . . . . . 49-39 49-40 Site Boundary Thyroid Dose CI Source Term,72 Hours . . . . . .........

l 49-39 49-41 Population Whole Body Dose DIRECT Source Term 24 Hours . . . . . . . . . 49-40 49-42 Population Whole Body Dose DIRECT Source Term,72 Hours . ... . . . 49-40 l 49-43 Site Boundary Whole Body Dose DIRECT Source Term 24 Hours . . . . . . . 49-41 49-44 Site Boundary Whole Body Dose DIRECT Source Term,72 Hours ..... 49-41 49-45 Site Boundary Red Bone Marrow Dose DIRECT Source Term,24 Hours . . . 49-42 49-46 Site Boundary Red Bone Marrow Dose DIRECT Source Term,72 Hours ... 49-42 49-47 Site Boundary Thyroid Dose DIRECT Source Term. 24 Hours . . . . . . . . . 4 9-4 3 49-48 Site Boundary Thyroid Dose DIRECT Source Term,72 Hours . . . . . . . . . . . 49-43 49-49 Population Whcle Body Dose IC Source Term,24 Hours . ... .... .. 49-44

i 49-50 Population Whole Body Dose IC Source Term,72 Hours ..... ... . . . 49-44 V 49-51 Site Boundary Whole Body Dose IC Source Term, 24 Hours . . . . . . .... . 49-45 49-52 Site Boundary Whole Body Dose IC Source Term,72 Hours . . .. . .. . 49-45 49-53 Site Boundary Red Bone Marrow Dose IC Source Term,24 Hours . . . . . . . 49-46 49-54 Site Boundary Red Bone Marrow Dose IC Source Term,72 Hours . . . . . . . . 49-46 49-55 Site Boundary Thyroid Dose IC Source Term,24 Hours . . . . . . . . . . . . . . 49-47 49-56 Site Boundary Thyroid Dose IC Source Term,72 Hours .. .. ..... . 49-47 49-57 Overall Dose Risk Site Boundary Whole Body, EDE,24 Hour Dose . . . . . . 49-48 49-58 Overall Dose Risk Site Boundary Acute Red Bone Marrow Dose 24 Hour . 49-48 51-1 AP600 Core Damage Frequency Uncenainty Histogram . . . . . . . . . . . . . . . . 51-19 51-2 AP600 PRA Uncenainty Analysis Results by Dominant Sequences .. ..... 51-20 51-3 AP600 PRA Uncenainty Analysis Results by Initiating Event .... ...... 51-21 52-1 Example Event Tree

Baseline Configuration . . . ......... ....... .52-117 52-2 Example Event Tree: Nonsafety-Related Systems Removed . . . . . . . . . . . .52-118 52-3 Example Event Tree: Nonsafety-Related Systems Removed and Core Damage States Simplified . . . ....... ........ ...... . . . . . .52-119 52-4 Example Event Tree: Final Focused PRA Sensitivity Study Configuration . .52-120 i

l 52-5 ATWS Event Tree . . . . . . . . . . . . . ............... .. ..... .52-121 52-6 ATWSC Event Tree . ...... . .. ..... .. . . ... .. .. .52-122 52-7 CMTLB CMT Line Break Event Tree . . . . . . . - . .... . . . . . . .52-123 52-8 ISLOC: Interfacing Systems LOCA Event Tree ........ ... . . . . . .52-124 V

ENEL Revision: 9 T Westirighouse mam April 11,1997 lxxix o:\ap600sprairev_9'pra-lof.wpf: I b l

l u_____ _ _ _ _ _ _ _

l l

l LIST OF FIGURES (Cont.)

e Figure No. Title Rage a

52-9 LCAS: Loss of Compressed Air Event Tree . . . . . . ... .... . . . . . . .52-125 52-10 LCCW: Loss of CCW/SWS Event Tree . . . . . ..... . . . . . . . . . . . . . . 5 2 126 52-11 LCOND: Loss of Condenser Event Tree ...... .. ............52-127 52-12 LLOCA: Large LOCA Event Tree .......... .. ... . . . . . . . . . 5 2-128 l

52-13 LMFW. Loss of Main Feedwater to both SGs Event Tree ..... .. . .52-129 52-14 LMFW1: Loss of Main Feedwater to One SG Event Tree . . . . . . . .52-130 52-15 LOSP: Loss of Offsite Power Event Tree . . . . . ... . ... . . . . . . . . .52-131 52-16 LRCS: Loss of Reactor Coolant Flow Event Tree ...... .. .. . .52-132 '

52-17 MLOCA: Medium LOCA Event Tree . . . . . . . . . ... .... ....52-133 52-18 NLOCA/CNLOCA: Intermediate LOCA/ Consequential Intermediate LOCA Event Tree .. ........... . .. ... . . ... . .52-134 52-19 POWEX Power Excursion Event Tree .... .... .. . . . . ..52-135 52-20 PRSTR: Passive RHR Tube Rupture Event Tree . . . . . . ... ...52-136 52-21 RV-RP: Reactor Vessel Rupture Event Tree . . ... .. .. .... ... .52-137 52-22 SGTR/CSGTR: SG Tube Rupture / Consequential SG Tube Rupture Event Tree ... .. . .... ......... . . ..... . ...52-138 52-23 SGTRC: SG Tube Rupture Initial Event Tree . . . . . . . .. .... . . . . .52-139 52-24 SI-LB: SI Line Break Event Tree .... ........ . . . . . . . . . .52-140 52-25 SLB-D: Steam Line Break Downstream of MSIVs Event Tree . . . . . . .52-141 52-26 SLB-U: Steam Line Break Upstream of MSIVs Event Tree . . . . . . ...52-142 52-27 SLB-V/CSLB-V: Stuck-Open Secondary Side Safety Valve / Consequential Stuck-Open Secondary Side Safety Valve Event Tree . .... ...... .52-143 52-28 SLOCA: Small LOCA Event Tree ... . . ..... . ..52-144 52-29 TRANS: Transients with Main Feedwater Event Tree . ..............52-145 52-30 Containment Event Tree for Accident Class 3BE . . . . . . . . . . . . . . .52-146 52-31 Containment Event Tree for Accident Class 3BL . . . . . . . . . . . . . . . 5 2- 147 52-32 Containment Event Tree for Accident Class 3BR . . ..... ...... ...52-148 52-33 Containment Event Tree for Accident Class IA .. .. .. . .. . . . .52-149 52-34 Containment Event Tree for Accident Class I AP . . . .. . .. . ... .52-150 52-35 Containment Event Tree for Accident Class 3A . . . . . . ... ........ .52-151 52-36 Containment Event Tree for Accident Class 3C . . . ... ... ..52-152 52-37 Containment Event Tree for Accident Class 3D . . . . . . . . . . . . . . . .52-153 52-38 Containment Event Tree for Accident Class 6 . . . .... .... ... . . . .52-154 52-39 Loss of Offsite Power (RCS Drained) Event Tree ... .... . .... .. .52-155 52-40 LOSP Dudng Hot / Cold Shutdown (RCS Filled) Event Tree ....... . . . .52-156 54-1 LOSP During Hot / Cold Shutdown (RCS Filled) Event Tree . . . . ..... .54-299 54-2 Loss of RNS Initiator During Hot / Cold Shutdown (RCS Filled) Event Tree . .54-300 54-3 Loss of CCW/SW Initiator During Hot / Cold Shutdown (RCS Filled)

Event Tree .... . ........ ... ....... .. .....54-301 9

p ,1997 1 W Westinghouse oTap600\pra\rev.,9pra-lof.wpf:1b IXT.X

LIST OF FIGURES (Cont.)

Finnre No. T. itis P.nas

$4-4 LOCA/RNS Pipe Rupave Dunng Hot / Cold Shutdown (RCS Filled)

Event Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-302 54-5 LOCA/RNS-V024 Opens Dunng Hot / Cold Shutdown (RCS Filled) .

Event Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-303 {

54-6 Overdrmmng of Reactor Coolant System Dunng Drundown to Mid. Loop . . .54-304 l 54-7 Loss of Offsite Power (RCS Dramed) Event Tree . . . . . . . . . . . . . . . . . . .54-305 54-8 Loss of RNS Initiator (RCS Dramed) Event Tree . . . . . . . . . . . . . . . . . . . .54-306 54 9 Loss of CCW/SW Initiator (RCS Dramed) Event Tree . . . . . . . . . . . . . . . .54-307 54-10 LOCA/RNS-V024 Opens (RCS Dramed) Event Tree . . . . . . . . . . . . . . . . .54-308 54-11 Accumulator Injection (Dilution Scenario) Event Tree . . . . . . . . . . . . . . . . .54-309 54-12 Shutdown Transient Case SDIB2 RCS Pressure vs. Tune . . . . . . . . . . . . . .54-310 54-13 Shutdown Transient Case SD1B2 Mass Flow Rare vs. Tune . . . . . . . . . . . .54-311 54-14 Shutdown RNS Break Case SD3A (3500 gym) . . . . . . . . . . . . . . . . . . . . .54-312 54-15 Shutdown RNS Break Case SD3A2 (2000 gpm) . . . . . . . . . . . . . . . . . . . .54-313 54-16 Shutdown RNS Break Case SD3A3 (1000 gym) . . . . . . . . . . . . . . . . . . . .54-314 54-17 Shutdown Plant Damage State Substate Event Tree for LP-ADS . . . . . . . . .54-315 54-18 Shutdown Plant Damage State Substate Event Tree for LP-1 A . . . . . . . . . . .54-316 54-19 Shutdown Plant Damage State Substate Event Tme for LP-3D . . . . . . . . . . .54-317 54-20 Shutdown Plant Damage State Substate Event Tree for LP-3BR . . . . . . . . . .54-318 54-21 Shutdown Plant Damage State Substate Event Tree for LP-3BE . . . . . . . . . .54-319 55-1 Seismic Initiating Event merarchy Tree . . . . . . . . . . . . . . . . . . . . . . . . . . 55-105 55-2 EQSTRUC Initiating Event Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-106 55-3 EQRVFA Initiating Event Fanit Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-108 55-4 EQLLOCA Imt anns Event Fanit Tres . . . . . . . . . . . . . . . . . . . . . . . . . . 55-109 55-5 EQSLOCA Initiating Event Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-110 55-6 EQN1WS Initiating Event Fault Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-111 55 EQSTRUC Event Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-112 55-8 EQRVFA Event Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-113 55-9 EQLLOCA Event Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-114 '

55-10 EQSLOCA Event Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-115 55-11 EQA'IWS Event Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-116 55-12 EQ.LOSP Event Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-117 )

55-13 EQLOSP Event Tree (for 0.5g level cantgaake) . . . . . . . . . . . . . . . . . . . . 55-118 55-14 EQAC2AB Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-119 55-15 EQXCIC Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-120 )

55-16 EQXADMA Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-121 l 55-17 EQXIW2A Fault Tres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-122 1 55-18 EQRECIR Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-123 j 55-19 EQCM2SL Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-124 55-20 EQADA Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-125 l 55-21 EQIW2AB Fault Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5-126 l Revisient 9 l Y@ ixxx .wsoop._,,wwm Apeil 11,1997

_w f

\

l LIST OF FIGURES (Cont.)

O Figure No. Title Dage 55-22 EQ-PRHR Fault Tree . . . . . .... .. ............ . . . . . . . . . . . 55-127 55-23 EQ-PRESU Fault Tree . . . . . ... ....... .............. .. 55-128 55-24 EQ-PMS Fault Tree . . . . . . . . . . . . . .. ......... . ... ... ... 55-129 55-25 EQ-DC Fault Tree . . . . . . . . . ... ... .................... . 55-130 55-26 Class 1E de Power Block Diagram . . . ... ..... . . . . . . . . . . . . . . . 5 5- 131 55-27 Containment Evaluation Model . . . . . . ............... . . . . . . . . 55-132 55-28 EQ-STRUC Event Sequences . . . . . .. . .. .. ............. . 55-133 55-29 EQ-RVFA Event Sequences . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 - 1 34 55-30 EQ-LLOCA Event Sequences . . . .. .. ............. ....... . 55-135 55-31 EQ-SLOCA Event Sequences . . .. ........................ .. 55-136 55-32 EQ-SGTR Event Sequences ...... .......... ..... . . . . . . . . . 55-137 55-33 EQ-SLB Event Sequences . ... . ............ . . . . . . . . . . . . 5 5- 138 55-34 EQ-ATWS Event Sequences . . . . . . . . . . . . . . . . . ............... 55-139 55-35 EQ-LOSP Event Sequences (for 0.5g level earthquakes) . .. .. .... . 55-140 56-1 Flood Zones and Barriers Plan at 66'-6" . .. ...... . ....... . . 56-93 56-2 Flood Zones and Barriers Plan at 82'-6" . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6-95 56-3 Flood Zones and Barriers Plan at 96'-6" . . . . . . . . . .. ..... .. .... 56-97 56-4 Flood Zones and Barriers Plan at 100'-0" & 107'-2" . .. . . . . . . . . . . . 5 6-99 56-5 Flood Zones and Barriers Plan at 117'-6" . . . . . . . . . . . . . . .. . .56-101 56-6 Flood Zories and Barriers Plan at 135'-3" .......... ... . . . . . . . . .56-103 56-7 Flood Zones and Barriers Plan at 160'-6" & 153'-0" . . ...... .. ...56-105 56-8 Flood Zones and Barriers Plan at 160'-6" & 180*-0" . . . . . . . . . ..... .56-107 56-9 8-in. Fire Main Rupture at-Power Event Tree ...... ... .... ..56-109 56-10 8-in. Fire Main Rupture during Hot / Cold Shutdown Event Tree . . . . . . . ..56-110 56-11 8-in. Fire Main Rupture during RCS Drained Conditions Event Tree . . . . . .56-111 57-1 Fire Progmssion Event Tree for 1200 AF 01 Fire Area . . . . ... .... ..57-156 59-1 Contribution of Initiating Events to Core Damage ................. .59-233 59-2 Contribution ofInitiating Events to Large Release Frequency and Core Damage Frequency . . . . . . . . . . . . . . . . . . .. ..... .59-234 59-3 Total Plant CDF/LRF . . . . . . ....... ...... .. ............ .59-235 59-4 24-Hour Site Boundary Dose Cumulative Frequency Distribution . . . . . . . . .59-236 Revision: 11 9

March 1998 3 Westlfighouse owemean_nwepra lxxxii

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