ML15035A006

02/04/2015 Meeting Presentation, Diablo Canyon Power Plant Process Protection System Replacement Lessons Learned Using ISG 6 NRC Meeting on Digital I&C.

ML15035A006
Person / Time
Site:	Diablo Canyon
Issue date:	02/04/2015
From:	Schrader K Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML15035A006 (16)

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DIABLO CANYON POWER PLANTPROCESS PROTECTION SYSTEM REPLACEMENTLESSONS LEARNED USING ISG 6 NRC Meeting on Digital I&C February42015February 4, 2015Ken Schrader, MSSenior Advisory Engineer PG&EVice Chairman, PWROGkjse@pge.com805-545-4328111 AgendaISG 6 (Licensing Process for Digital I&C System Modifications) Pilot Application and StatusPG&E ISG 6 Positive ExperiencesPG&E ISG 6 Lessons Learned 2 2

ISG 6 Pilot ApplicationDiabloCanyonispilotplantforuseofISG6Diablo Canyon is pilot plant for use of ISG 6PG&E participated in ISG 6 working groupPG&Esubmittedpilotapplication10/26/11PG&E submitted pilot application 10/26/11(ML11307A331)ProcessProtectionSystemreplacementProcess Protection System replacementInvensys Tricon V10 (PLCbd)(PLC based)Westinghouse Advanced Logic System(ALS)(FPGAbased)33-(ALS) (FPGA based)

ISG 6 Pilot ApplicationCurrent StatusInvensys -Factory Acceptance Testing (FAT) completed and equipment deliveredWtihFildiiIV&ViFATWestinghouse -Final design in IV&V review, FAT scheduled to be completed in May InitialACRSmeetingscompletedwithnorequestedInitial ACRS meetings completed with no requested changesCompleting final documentation and will need to pgrespond to final set of RAIsNRC approval expected late 201544 ISG 6 Pilot ApplicationNRC support of application has been excellentResourcesUse of sharepoint site for documentationEfficientresolutionofopenitemsEfficient resolution of open itemsIdentifying lessons learned from Oconee projectACRSpresentations/meetingsACRS presentations/meetings55 ISG-06 Positive ExperiencesISG6Pre-submittal(Phase0)MeetingsISG 6 Presubmittal (Phase 0) MeetingsNRC feedback critical to completing initial design that did not require any subsequent significant qyqgchangesPG&E decided to not use cross channel communications, two-way safety communications, or signal voting in the designVerybeneficialtoreducelicensingandfinancialVery beneficial to reduce licensing and financial risk66 ISG-06 Positive ExperiencesISG6ProcessforuseofApprovedVendorISG 6 Process for use of Approved Vendor Topical Reports (Tier 1, "fast-track")SignificantlysimplifiesLAR(5-10timessmaller)Significantly simplifies LAR (510 times smaller)Can largely reference topical report for compliance with ISG-4, IEEE-603, IEEE 7-4.3.2 Eliminate need for large project team (utility and vendor)77 ISG-06 Positive ExperiencesISG6AllowanceforOpenItemsListandISG 6 Allowance for Open Items List and Public Phone CallsAllowedefficientresolutionofquestionsAllowed efficient resolution of questionsLimited Requests for Additional Information that required docket responses to be minimizedUse of internet sharepoint website for documentsAllowed documents to be viewed by NRC staffFacilitated efficient response to questions 88 ISG-06 Lessons LearnedPG&Eoriginaldesignusedsinglenon-safetyPG&E original design used single nonsafety maintenance workstation for both Tricon and ALS subsystems in each of four divisions Testing and software requirements following software changes were not considered, became NRC issuePG&EhddittitPG&E changed design to use separate maintenance computer for each subsystem in each divisionSimplifiesfactoryacceptancetestingrequirementsandSimplifies factory acceptance testing requirements and eliminates potential software interaction issues9 ISG-06 Lessons LearnedPG&EissuedsingleFunctionalRequirementsPG&E issued single Functional Requirements Specification for project (applied to both vendors)All functional requirements were not applicable to each dvendorResulted in unnecessary difficulty for vendor design, vendor documentation, and NRC review Contributed to vendors not meeting all applicable requirements during detailed design VendorverificationpersonnelandNRCidentifiedissuesVendor verification personnel and NRC identified issues during vendor auditsRequired redesign, extended vendor schedules, complicated NRCi10NRC review ISG-06 Lessons LearnedPG&EdidnotincorporateI&CmaintenancepersonnelPG&E did not incorporate I&C maintenance personnel expectations to support troubleshooting and maintenance into initial Functional Requirements SifitiSpecificationsRequired revision to Functional Requirements SpecificationtoincludemaintenancepersonnelneedsSpecification to include maintenance personnel needsCaused vendors to have to redesign to meet a few new functional requirements 11 ISG-06 Lessons LearnedVendorsdidnotfullyunderstandmeaningofsomeVendors did not fully understand meaning of some functional requirementsNuclear requirements and terminology are uniqueSome vendor design personnel did not have prior nuclear project experience (most PLC and FPGA business is non-nuclear)Clarifying questions on requirements from vendors occurred late in detailed design, required some redesignUtilitiesneedtoproactivelyensurevendordesignandIV&VUtilities need to proactively ensure vendor design and IV&V personnel have correct understanding of all requirements 12 ISG-06 Lessons LearnedVendorsunderestimatedeffortfordetaileddesignVendors underestimated effort for detailed designFirst-of-Its-Kind large scope application of each vendor platform to US nuclear plant protection systemNlitdlNuclear requirements and processes are more complexVendor document revisions required to address ISG 6 requirementsTwo year delay occurred in LAR review schedule to address combined aspects of functional requirements specificationchangesredesignandFirstofitsKindspecification changes, redesign, and First-of-its-Kind engineering13 SummaryISG6ISG 6Roadmap to success to develop acceptable License Amendment Request (LAR)q()ISG 6 process will reduce licensing uncertainty and effort for future licensees/vendorsUtilities should strongly consider designs with approved Vendor Topical Reports LARflliISG6ditilLARs following ISG 6 and incorporating lesson learned from initial plant applications can be approvedintimelymanner1414approved in timely manner ISG 6 Pilot ApplicationProjectScopeProject Scope 1515 ISG 6 Pilot ApplicationProcess Protection System Replacement AhittArchitecture 1616