ML13078A250

03/19/2013-03/21/2013 Licensee Meeting Slides Re Joseph M. Farley Nuclear Plant NFPA 805 Fire Modeling LAR Submittal - Session 4

ML13078A250
Person / Time
Site:	Farley
Issue date:	03/19/2013
From:	Southern Nuclear Operating Co
To:	Division of Operating Reactor Licensing
Brown E
Shared Package
ML13078A284	List: ML13078A245 ML13078A246 ML13078A247 ML13078A248 ML13078A250 ML13078A251 ML13078A252 ML13078A253 ML13078A255
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Download: ML13078A250 (14)

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FNP NFPA 805 LAR Submittal Overview OverviewMarch19-21, 2013 Circuit Analysis Summary*Circuit Analysis Process and ControlsAltQlifiti

• A na l ys t Q ua lifi ca ti ons*Governing Analysis Criteria SC*N SC A vs. PR A*Analysis Methodology*Circuit Analysis Database

• Associated CircuitsCircuit AnalysisSlide 2of 14 Process and Controls*Circuit Analysis ProcessPerformedIAWapprovedprocedure

-Performed IAW approved procedure-Strict and formal analysis conventions

-Emphasisonconsistencyandstandardization Emphasis on consistency and standardization-Integrated PRA and NSCA requirements

• Controls Controls-Rigidly defined Function States-Independent verification for each analysis-Detailed documentation in database (FDM/ARCPlus)Circuit AnalysisSlide 3 of 14 Analyst Qualifications*All analysts formally qualified to SNC & ContractorQUALCARDforindependentwork Contractor QUAL CARD for independent work*Internalized industry lessons learned on training, qualificationsandoversight qualifications , and oversight*Procedure and database established to force consistency consistency*Maintained awareness of dual use -PRA and NSCA NSCACircuit AnalysisSlide 4of 14 Governing Criteria*NEI 00-01, Rev.1-Initial Work to Rev.1

-Gap analysis performed to Rev. 2 (per Generic RAI 10 and RG 1.205)

• NEI00-01Rev2 NEI 00 01 , Rev. 2-Later work

-Integrated emerging PIRT issuesNdittkfffhli-N o cre dit t a k en f or o ff-sc h eme exc l us i ons*NUREG/CR-6850

-Included O p en circuits pNote: Integrated requirements for conservative, but universal criteria between PRA and NSCA Circuit AnalysisSlide 5 of 14 NSCA vs. PRA*Implementing Concepts

-95% of circuit anal ysis criteria for PRA and NSCA are y the same*Establish single dataset for criteria to assure dual use and betterinterfacebetweenNSCAandPRA better interface between NSCA and PRA*Provide procedure and database flexibility to accommodate the 5% difference Longtermconfigurationcontrolextremelydifficultif

-Long-term configuration control extremely difficult if redundant data sets are maintained

-Differences p rimaril y handled throu g h:pyg*Use of Function States*Interlock identification and documentationCircuit AnalysisSlide 6 of 14 Analysis Methodology*All circuit analysis drive by FUNCTION STATES

• FunctionStates Function States-Component + Initial State + Desired State-Permits maximum flexibility to accommodate PRA and NSCA differences (primarily auto signals)-Minimize false failures up frontEffiitdl-Effi c i en t an d less error prone-Consistent with NUREG/CR-6850 methods for Tasks 3&9 3 & 9Circuit AnalysisSlide 7 of 14 Analysis Methodology, cont-*Work package development to facilitate process

• Single,controlleddatabase(FDM)

Single, controlled database (FDM)*Process and techniques based on NRC/EPRI trainin g modules g*Major Steps Prere q uisites satisfied q*Function state established*Plant specific rules and conventions

• Generalclassification

• General classification*Resolve questionsCircuit AnalysisSlide 8 of 14 Analysis Methodology, cont-*Major Steps Work Packa g e Develo p ment gp*Drawings*Supplemental informationCableSelection Cable Selection*All scheme cables dispositioned

• Fault codes applied to all cables*Basis documented for excluded cables

• Selection of required cables with "hot probe" method

• Cablesgenerallyexcludedbasedonlyondesignfeaturesat Cables generally excluded based only on design features at this stage (NUREG/CR-6850 concept)Circuit AnalysisSlide 9 of 14 Analysis Methodology, cont-*Major Steps Power Su pp l y Identificationppy*All Power Supplies identified*Required and not-required determined based on Function Staterequirements State requirements*Sensitive to alternate PS lineups and how they are creditedDependencies & Interlocks*All circuit interlocks formally dispositioned

• Equipment dependencies established or off-scheme cables directly incorporated*Differentiate auto functions so NSCA and PRA can apply as credited by Basic EventCircuit AnalysisSlide 10 of 14 Analysis Methodology, cont-*Major Steps Documentation*Controlled database, with individual analysis originate and check sign-offs

• Referencedrawing Reference drawing*Final calculation for circuit analysis and PRA NotebookCircuit AnalysisSlide 11 of 14 Circuit Analysis DatabaseCircuit AnalysisSlide 12 of 14 Associated Circuits*Electrical Coordination

-Consolidated calculation-Addresses NSCA & PRA*Common Enclosure-Addresses secondary fire concerns-Addresses loss of DC control power to Switchgear*CPT Open Circuits-Followed PIRT recommendations*MHIF Analysis-Followed NEI 00-01, Appendix B methodCircuit AnalysisSlide 13 of 14 Qti?Q ues ti ons ?Circuit AnalysisSlide 14 of 14