ML110970641

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Licensee Slides from 4/7/11 Meeting with Southern California Edison Company to Discuss a Planned Submittal of a License Amendment Request to Revise Fire Protection Requirements
ML110970641
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 04/07/2011
From:
Southern California Edison Co
To:
Division of Operating Reactor Licensing
Hall, J R, NRR/DORL/LPL4, 301-415-4032
References
TAC ME5875, TAC ME5876
Download: ML110970641 (23)
v • d • e


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Introductions

Linda Conklin - Licensing Manager NFPA 805 Project Team

  • Sal Dolcemascolo - Project Manager
  • Bob Richter - Fire Protection Lead
  • Gary Chung - PRA Lead
  • Cyrus Vadoli - Electrical Lead

Meeting Purpose D'iscus,s, Status of SONG:S, NFPA 80:5 Projlect an,d li'censing Amen_dm,ent Re,q'uest l...... il1K th~ "\\)' in nk~cil!o*

NFPA 805 Project Team NFPA 805 Management Senior Director of Sponsor Engineering Director NRA

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i Scheduler +----1 NFPA805 Matrixed Stakeholders Budgets Project Manager 1 Procurement T NFPA805 Project 1 Technical Lead 1 1 Fire Department Operations Training Hea~h Physics Maintenance Work Control Outage Management ~-------------T-------~-----r-------------I 1T ",. PRA Le"" I 1 't' E"","" Leo' + F". P"'ed'oo Leo' Lire""", Leoo ~ t t PRA Engineers Electrical/Safe Shutdown Engineers I 't' FP Engineers

  • Supplemental Support Supplement Support Supplemental Support Supplemental Support 1..w.l111JC rlu: (\\," in nk..cnici~*

Agenda

  • Project Status
  • Fire PRA Quality
  • Fire Modeling
  • Plant Modifications & Recovery Actions
  • Preliminary Results
  • Challenges
  • LAR Submittal
  • Questions 1A....llnx rh~ \\'e'a)"in nlccnic:hy

Project Status Prepared and Reviewed

  • Fundamental FP
  • 8-1 Table pending FRE results
  • NSCA Methodology
  • 8-2 Table pending FRE results
  • Fire Area by Fire Area Review
  • 8-3 Table pending FRE results
  • E.E. and Licensing Action Reviews
  • Radiological Release Evaluation 1A.wlil'lJ( rh.: \\,('a)' in Itlcccricily 6

Project Status Under Review

  • Fire Risk Evaluations

~Number of Fire Areas - 217 ~Number of VFDRs - 554 ~Number of Fire Risk Evaluations - 211

  • Fire PRA Calculations l.L'lldil1M rh.: \\~'a). in nl,,'Crrici~*

Project Status Work In Progress

  • New VFDRs Requiring Fire Risk Evaluations
  • NPO Analysis
  • MSO Evaluation Revision
  • EE and Licensing Action Walkdown Confirmations
  • Modification Scoping l.eadhlC' rh.: ~'a). in IUcccricil}

Internal Events PRA Quality

  • Peer reviewed against ASME Standard Addendum A (2003)
  • Independent assessment against ASME Standard Addendum A (2004)
  • All F&O were resolved and independently verified for both assessments
  • All S Rs assessed to CC II except two (conservative LERF) 1...... 1"" til.: "..). in nk-cnici~*

Fire PRA Quality

  • Developed consistent with NUREG/CR-6850 (including Supplement 1)
  • Incorporates approved and applicable FAQ resolutions
  • EPRI/NRC HRA Guidelines
  • No deviations from the sources listed above 1....h1K rh~ "'a,.In nl~ciry

Fire PRA Peer Review

  • Performed by PWR Owners Group (July 2010)
  • Against ASME/ANS Standard & Regulatory Guide 1.200, Revision 2
  • Peer review team consisted of 9 reviewers:

- 6 consultants and 3 utility PRA reviewers l.Lwlh1JC th~ \\~). in nleccrici~*

Fire PRA Peer Review Results

  • 182 ASME / ANS supporting requirements

- 159 evaluated

  • 35 met CC II and III
  • 97 met CC I1II1III
  • 27 less than CC II

- 23 not reviewed/not applicable

  • Qualitative and quantitative screening were not performed, therefore not reviewed.

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Fire PRA Peer Review F&Os

  • Consist of findings, suggestions and best practices
  • Used as basis for the Supporting Requirement categorizations
  • SONGS Results

~ 4 Best Practices ~ 14 Suggestions ~ 32 Findings l.L-adhl( th~ "ta,*in lt1\\"Ccrici~*

F&O,Resolution Status

  • Resolution of F&Os are in progress and expected to be resolved prior to LAR
  • Technical F&Os that could affect FRE calculations were resolved prior to performing calculations One remaining F&O still being assessed for impact
  • No significant findings that would impact NFPA 805 application (i.e. no impact on delta risk calculations) l.....ail1j( th~ "'1,.in IUccnici~*

PRA Best Practices

  • Cable Selection

~ Comprehensive fire PRA database with complete circuit analysis (performed with in-house resources)

  • Plant Response Model

~ Complete verification that internal event F&O resolutions do not adversely affect the fire PRA ~ Very thorough documentation of internal event F&O resolutions

  • Human Reliability Analysis

~ Detailed assessment of fire procedure and affected alarm response procedures and identification of potential detrimental actions

  • Fire Scenario Selection

~ Complete and detailed fire modeling database (non-suppression probabilities, severity factors, time to damage) l...'8di"M thu "..," in F.k.-ccricity

Use of Fire Modeling as a Performance Based Approach to Compliance Demonstrate compliance using Fire Modeling for selected fire area(s) Assessment follows Section 4.2.4.1 of NFPA 805 ~ Identification of target - from VFDRs ~ Damage threshold ~ Limiting condition ~ Fire scenarios

  • Maximum expected fire scenario
  • Limiting fire scenario

~ Protection of the required success path

  • Prevention through administrative control
  • Mitigation through detection and suppression

~ Operations Consideration

  • Feasibility of recovery actions credited in the VFDR Fire models are consistent with NFPA 805 Section 2.4.1.2 Defense-in-depth and Safety Margin l...... il1M rh~ \\~")' in ItI,,~c:i~*

Plant Modifi,cations

  • Risk Informed Modifications

~ Modify/Protect circuitry associated with PZR heaters ~ Protect CCW Letdown HX Crosstie Valves ~ Protect/Isolate cables associated with control of the SG ADVs ~ Modify/Protect circuitry associated with RCPs control ~ Protect CCW Non-Critical Loop Valves

  • Modification Scoping is Underway
  • Modifications Summary in LAR l.LwlhlC rh.: \\~..,. in nk"CCrici~*

NFPA 805 "Recovery Actions"

  • Risk Informed

- Success Path Recovery Actions - Example: Long Term CST Makeup, ASD non-primary control station

  • Defense I n Depth

~ Recovery Actions ~ Potential Modifications to eliminate some DID recovery actions 1...... I"M th~ "'a,"in nlcccrici~'

  • Preliminary Results Fire PRA*:

CDF = 3.7E-5/yr LERF = 4.8E-6/yr Other Initiating Events: CDF = 3.3E-5/yr LERF =1.5E-6/yr

  • Includes credit for modifications and recovery actions l.Lwlil1JC th~ '1'a)* In nl,,~nici~*

Project Challenges

  • Industry

- Complex Technical and Licensing Processes - Multi-discipline / First Time Evolution

  • SONGS

- Letter of Intent Submitted 2008

  • Multiple Priorities and Regulatory Commitments
  • Limited Industry Technical Resources l...-adit1JC th~ \\,('a). in 1'U,,'CCIlci~*

LAR Submittal Challenges

  • Current LAR Completion Challenges:

~ Containment Walkdowns ~ Completion of Fire Risk Evaluations ~ Evaluation of New VFDRs ~ Walkdowns of EE/LA Evaluations ~ Scoping Proposed Plant Modifications (Risk & DID) ~ PRA Application Specific Calculations ~ Address the one remaining F&O

  • Challenges not resolved become LAR.

Commitments. l.L-odi'lC th~ "a). in RI,,'CCrici.,*

LAR Submittal

  • Intent is to submit a complete LAR
  • Include:

commitments for unresolved open issues fire modeling for NRC Review and Approval lA....il1K rh~ \\8,.in Rk."Cmcit}"

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