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)

Text

DIABLO CANYON POWER PLANTPROCESS PROTECTION SYSTEM REPLACEMENTLESSONS LEARNED USING ISG 6

NRC Meeting on Digital I&C February42015 February 4 , 2015Ken Schrader, MSSenior Advisory Engineer PG&EVice Chairman, PWROG kjse@pge.com 805-545-4328 1 1 1 A gendaISG 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 b ase d)Westinghouse Advanced Logic System(ALS)(FPGAbased) 3 3-(ALS) (FPGA based)

ISG 6 Pilot Application Current StatusInvensys -Factory Acceptance Testing (FAT) completed and equipment deliveredWtihFildiiIV&ViFATW es ti ng h ouse -Fi na l d es i gn i n IV&V rev i ew, FAT scheduled to be completed in May InitialACRSmeetingscompletedwithnorequestedInitial ACRS meetings completed with no requested changesCom p letin g final documentation and will need to pgrespond to final set of RAIsNRC approval expected late 2015 4 4 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/meetings 5 5 ISG-06 Positive ExperiencesISG6Pre-submittal(Phase0)MeetingsISG 6 Pre submittal (Phase 0) MeetingsNRC feedback critical to completing initial design that did not re quire an y subse quent si g nificant qyqg changesPG&E decided to not use cross channel communications, two-way safety communications, or signal voting in the designVerybeneficialtoreducelicensingandfinancialVery beneficial to reduce licensing and financial risk 6 6 ISG-06 Positive ExperiencesISG6ProcessforuseofApprovedVendorISG 6 Process for use of Approved Vendor Topical Reports (Tier 1, "fast-track")SignificantlysimplifiesLAR(5

-10timessmaller)Significantly simplifies LAR (5 10 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)7 7 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 8 8 ISG-06 Lessons LearnedPG&Eoriginaldesignusedsinglenon

-safety PG&E original design used single non safety 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 c h ange d d es i gn t o use separa t e ma i n t enance computer for each subsystem in each divisionSimplifiesfactoryacceptancetestingrequirementsandSimplifies factory acceptance testing requirements and eliminates potential software interaction issues 9

ISG-06 Lessons LearnedPG&EissuedsingleFunctionalRequirements PG&E issued single Functional Requirements Specification for project (applied to both vendors)All functional requirements were not applicable to each d ven d o rResulted 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 NRCi 10 NRC rev i ew ISG-06 Lessons LearnedPG&EdidnotincorporateI&Cmaintenancepersonnel PG&E did not incorporate I&C maintenance personnel expectations to support troubleshooting and maintenance into initial Functional Requirements Sifiti S pec ifi ca ti onsRequired revision to Functional Requirements Specificationtoincludemaintenancepersonnelneeds Specification to include maintenance personnel needsCaused vendors to have to redesign to meet a few new functional requirements 11 ISG-06 Lessons LearnedVendorsdidnotfullyunderstandmeaningofsome Vendors 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 LearnedVendorsunderestimatedeffortfordetaileddesign Vendors underestimated effort for detailed designFirst-of-Its-Kind large scope application of each vendor platform to US nuclear plant protection systemNlitdlN uc l ear requ i remen t s an d processes are more comp l exVendor document revisions required to address ISG 6

requirementsTwo year delay occurred in LAR review schedule to address combined aspects of functional requirements specificationchangesredesignandFirst of its Kind specification changes , redesign , and First-of-its-Kind engineering 13 SummaryISG6ISG 6Roadmap to success to develop acceptable License Amendment Re q uest (LAR)q()ISG 6 process will reduce licensing uncertainty and effort for future licensees/vendorsUtilities should strongly consider designs with approved Vendor Topical Reports LARflliISG6ditilLAR s f o ll ow i ng ISG 6 an d i ncorpora ti ng l esson learned from initial plant applications can be approvedintimelymanner 14 14 approved in timely manner ISG 6 Pilot ApplicationProjectScopeProject Scope 15 15 ISG 6 Pilot ApplicationProcess Protection System Replacement Ahitt A rc hit ec t ure 16 16