ML17326A145
| ML17326A145 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/04/1999 |
| From: | SEPP H A WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | COLLINS S J NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17326A143 | List: |
| References | |
| CAW-99-1348, NUDOCS 9909240200 | |
| Download: ML17326A145 (12) | |
Text
WestinghouseElectricCompanyDocumeiitControlDeskU.S.NuclearRegulatoryCommissionWashington,DC'0555Box355PittsburghPennsylvania15230-0355August4.)999CAW-99-I348Attention:Mr.SamuelJ.CollinsAPPLICATIONFORWITHI-IOLDINGPROPRIETARYINFORMATIONFROivlPUBLICDISCLOSURESubject"ControlRodInsertionFollowin<aColdLc<LBLOCA.D.C.Cook.UnitsIand.."<VCAP-I5245(Proprietarv).islay.1999and"ControlRodInsertionFollowingaColdLegLBLOCA.D.C.Cook.UnitsIand2.."EVCAP-I5246(Non-Proprietary).<clay,l999
DearMr.Collins:
Theproprietaryinformationforwhichivithholdingisbeingrequestedintheabove-referencedreportisfurtheridentifiedinAffidavitCATV-99-l348signedbytheowtteroftheproprietaryinformation.WestinghouseElectricCon>panyLLC.'fheaffidavit.ivhichaccoinpaniesthisletter,setsforththebasisonwhichtheinformationmaybewithheldfroinptiblicdisclosurebytheCon>missionandaddresseswithspecificitytheconsiderationslistedinparagraph(b)(4)of10CFRSection2.790oftheCoiumission'sregulations./Accordingly,thisletterautliorizestheutilizationoltheacconipanyingAffidavitbyAinericanElectricPower.Correspondencewithrespecttotheproprietaryaspectsoftheapplicationforwithholdingorthei<Vestinghouseaffidavit.shouldreferencethisletter.CATV-99-l348andshouldbeaddressedtotheundersigned.VcrvtrulvvoursII.A.Sepp.<vlana<erRegulatoryandLicensingEngineeringEnclosurescc:T.Carter/NRC(5E7)~'<~t,<,~<tC.I,.s49'>VV09ÃeOaOO9909<>(PDR,ADOCK'5000315.POR
.CAW-99-1348AFFIDAVITCOMMONWEALTHOFPENNSYLVANIA:ssCOUNTY=OFALLEGHENY:Beforeme,theundersignedauthority.personallyappearedHenryA.Sepp,who.beingbymedulyswornaccordingtolaw,deposesandsaysthatheisauthorizedtoexecutethisAffidavitonbehalfofWestinghouseElectricCompanyLLC("westinghouse"),andthattheaverrnentsoffactsetforthinthisAffidavitaretrueandcorrectto'thebestofhisknowledge.information,andbelief:Sworntoandsubscribedbeforethis~deyof.I999HenryA.Sepp,ManagerRegulatoryandLicensingEngineeringNotaryPublictrot:t;saiBet)tJanettA,bci&an,rt.til.rrrstOt,{onrottvtt'eBoreAtogttonyCot.ntyM~CoritmtsstonE>n<rosMay22.2000Mttrttbttr,~vanhtAssooationotNotanes CAW-99-1348(I)IamManager,RegulatoryandLicensingEngineering,intheNuclearServicesDivision,oftheWestinghouseElectricCompanyLLC("Westinghouse"),andassuch,Ihavebeenspecificallydelegatedthefunctionofreviewingtheproprietaryinformationsoughttobewithheldfrompublicdisclosureinconnectionwithnuclearpowerplantlicensingandrulemakingproceedings,andamauthorizedtoapplyforitswithholdingonbehalfofWestinghouse.(2)IammakingthisAffidavitinconformancewiththeprovisionsof10CFRSection2.790oftheCommission'sregulationsandinconjunctionwiththeWestinghouseapplicationforwithholdingaccompanyingthisAffidavit.(3)IhavepersonalknowledgeofthecriteriaandproceduresutilizedbyWestinghouseElectricCompanyLLCindesignatinginformationasatradesecret.privilegedorasconfidentialcommercialorfinancialinformation.(4)Pursuanttotheprovisionsofparagraph(b)(4)ofSection2.790oftheComtnission'sregulations,thefollowingisfurnishedforconsiderationbytheCommissionindeterminingwhethertheinformationsoughttobewithheldfrompublicdisclosureshouldbewithheld.(i)TheinformationsoughttobewithheldfrompublicdisclosureisownedandhasbeenheldinconfidencebyWestinghouse.(ii)TheinformationisofatypecustomarilyheldinconfidencebyWestinghouseandnotcustomarilydisclosedtothepublic.Westinghousehasarationalbasisfordeterminingthetypesofinformationcustomarilyheldinconfidencebyitand,inthatconnection,utilizesasystemtodeterminewhenandwhethertoholdcertaintypesofinformationinconfidence.TheapplicationofthatsystemandthesubstanceofthatsystemconstitutesWestinghousepolicyandprovidestherationalbasisrequired.Underthatsystem,informationisheldinconfidenceifitfallsinoneormoreofseveraltypes,thereleaseofwhichmightresultinthelossofanexistingorpotentialcompetitiveadvantage,asfollows:(a)Theinfortnationrevealsthedistinuishingaspectsofaprocess(orcomponent.structure.tool.method.etc.)wherepreventionofitsusebyanyof CAW-99-1348Westinghouse'scompetitorswithoutlicensefromWestinghouseconstitutesacompetitiveeconomicadvantageoverothercompanies.(b)Itconsistsofsupportingdata,includingtest'data,relativetoaprocess(orcomponent,structure,tool,method,etc.),theapplicationofwhichdatasecuresacompetitiveeconomicadvantage,e.g.,byoptimizationorimprovedmarketability.(c)Itsusebyacompetitorwouldreducehisexpenditureofresourcesorimprovehiscompetitivepositioninthedesign,manufacture,shipment,installation,assuranceofquality.orlicensingasimilarproduct.(d)Itrevealscostorpriceinformation.productioncapacities.budgetlevels,orcommercialstrategiesofWestinghouse,itscustomersorsuppliers.(e)Itrevealsaspectsofpast,present.orfutureWestinghouseorcustomerfundeddevelopmentplansandprogramsofpotentialcommercialvaluetoWestinghouse.(f)Itcontainspatentableideas,forwhichpatentprotectionmaybedesirable./TherearesoundpolicyreasonsbehindtheWestinghousesystemwhichincludethefollowing;(a)TheuseofsuchinfortnationbyWestinghousegivesWestinghouseacompetitiveadvantageoveritscompetitors.Itis,therefore,withheldfromdisclosuretoprotecttheWestinghousecompetitiveposition.(b)Itisinformationwhichisn>arketableinmanyways.TheextenttowhichsuchinformationisavailabletocompetitorsdiminishestheWestinghouseabilitytosellproductsandservicesinvolvingtheuseoftheinformation.(c)UsebyourcompetitorwouldputWestingttouseatacompetitivedisadvantagebyreducinghisexpenditureofresourcesatourexpense.
4CAW-99-1348(d)EachcomponentofproprietaryinfortnarinuymmuetuttoaparticularcompetitiveadvantageispotentiallyasvaluableasthewtaIcompetitiveadvantage.Ifcompetitorsacquirecomponentsofproprietaryinformation,anyonecomponentmaybethekeytotheentirepuzzle.therebydeprivingWestinghouseofa.competitiveadvantage.(e)UnrestricteddisclosurewouldjeopardizethepositionofprominenceofWestinghouseintheworldmarket,andtherebygiveamarketadvantagetothecompetitionofthosecountries.(f)TheWestinghousecapacitytoinvestcorporateassetsinresearchanddevelopmentdependsuponthesuccessinobtainingandmaintainingacompetitiveadvantage.(iii)TheinformationisbeingtransmittedtotheCommissioninconfidenceand,undertheprovisionsof10CFRSection2.790,itistobereceivedinconfidencebytheCommission.(iv)Q>einformationsoughttobeprotectedisnotavailableinpublicsourcesoravailableinformationhasnotbeenpreviouslyemployedinthesameoriginalmannerormethodtothebestofourknowledgeandbelief.(v)Theproprietaryinformationsoughttobewithheldinthissubmittalisthatwhichisappropriatelymarkedin"ControlRodInsertionFollowingaColdLegLBLOCA,D.C.Cook,UnitsIand2,."WCAP-15245(Proprietary),May,1999fortheD.C.CookUnits1and2NuclearPlant.beingtransn>ittedbyAmericanElectricPowerleuerandApplicationforWithholdingProprietaryInformationfromPublicDisclosure,totheDocumentControlDesk,Attentionlvlr,SamuelJ.Collins.TheproprietaryinformationassubmittedforusebyAmericanElectricPowerfortheD.C.CookNuclearPlantUnits1and2isexpectedtobeapplicableinotherlicenseesubmittalsinresponsetocertainNRCrequirementsforjustificationoftheuseofControlRodInsertionFollowingaColdLegLBLOCA.' CAW-99-1348Thisinformationispartofthatwhichwillenablewestinghouseto:(a)AssistthecustomertoobtainNRCapproval.Furtherthisinformationhassubstantialcommercialvalueasfollows:(a)WestinghouseplanstoselltheuseofsimilarinformationtoitscustomersforpurposesofmeetingNRCrequirementsforlicensingdocumentation.(b)Westinghousecansellsupportanddefenseofthetechnologytoitscustomersinthelicensingprocess.PublicdisclosureofthisproprietaryinformationislikelytocausesubstantialharmtothecompetitivepositionofWestinghousebecauseitwouldenhancetheabilityofcompetitorstoprovidesimilarservicesandlicensingdefenseservicesforcommercialpowerreactorswithoutcommensurateexpenses.Also,publicdisclosureoftheinformationwouldenableotherstousetheinformationtomeetNRCrequirementsforlicensingdocumentationwithoutpurchasingtherighttousetheinformation.ThedevelopmentofthetechnologydescribedinpartbytheinformationistheresultofapplyingtheresultsofmanyyearsofexperienceinanintensiveWestinghouseeffort,andtheexpenditureofaconsiderablesumofmoney.InorderforcompetitorsofWestinghousetoduplicatethisinformation,similartechnicalprogramswouldhavetobeperformedandasignificantmanpowereffort.havingtherequisitetalentandexperience.wouldhavetobeexpendedfordevelopingtestingandanalyticaln>ethodsandperformingtests.Furtherthedeponentsayethnot.
ATTACHMENT1TOC0999-11DESCRIPTIONOFTHEPROPOSEDMETHODOLOGYCHANGEA.SummaryofProposedChangesIndianaMichiganPowerCompany(IAM),thelicenseeforDonaldC.CookNuclearPlant(CNP),Units1and2,proposestoamendFacilityOperatingLicensesDPR-58andDPR-74.I&Mproposestoallowcreditintheapplicablesubcriticalityanalysisforthenegativereactivityprovidedbyinsertionoftherodclustercontrolassemblies(RCCAs)duringrealignmentfromacoldlegrecirculationtoahotlegrecirculationconfiguration.Thisrealignment,whichisreferredtoashotlegswitchover(HLSO),isperformedfollowingaloss-of-coolantaccident(LOCA).ThismethodologychangerequiresNRCstaffreviewandapprovalpertheprovisionsof10CFR50.90.TheproposedchangeaffectstheBasesforTechnicalSpecification(T/S)3/4.5.5,"RefuelingWaterStorageTank,"andseveralsectionsoftheUpdatedFinalSafetyAnalysisReport(UFSAR).TheproposedchangesaredescribedindetailinSectionEofthisattachment.T/SpagesthataremarkedtoreflecttheproposedmethodologychangeareprovidedinAttachments2Aand2BforUnit1andUnit2,respectively.TheproposedT/Spages,withthesechangesincorporated,areprovidedinAttachments3Aand3BforUnit1andUnit2,respectively.B.DescriptionoftheCurrentRequirementsInthecurrentLBLOCAanalysis,asstatedinUFSARSection14.3,"ReactorCoolantSystemPipeRupture(LossofCoolantAccident),"anaveragereactorcoolantsystem(RCS)/sumpmixedboronconcentrationiscalculatedtoensurethecoreremainssubcriticalduringlong-termcoolingfollowingaLOCA.Theinsertionofcontrolrodstoprovideanynegativereactivitytothereactorcoreisnotcreditedinthelargebreakloss-of-coolantaccident(LBLOCA)analyses.Theemergencycorecoolingsystem(ECCS)hasbeendesignedtomitigatetheeffectsofpostulatedLOCAsbyprovidingasufficientamountofboratedwatertoprotectthefuelinthereactorcore.Unit1UFSARSection14.3.1andUnit2UFSARSection14.3.1.1.2,"SequenceofEventsandSystemsOperations,"states,inpart,thefollowing:/"CriticalitycontrolisachievedbydeterminingtheRWSTandaccumulator/concentrationsnecessarytomaintainsubcriticalitywithoutcreditforRCCAinsertion.ThenecessaryRWSTandaccumulatorconcentrationsareafunctionofeachcoredesign/andarecheckedeachcycle.ThecurrentTechnicalSpecificationsvalueis2400to2600ppmboron."TheUnit2UFSARcontainsanadditionalclarificationthattheT/Srangeof2400to2600ppmboronappliestotheRWSTandtheaccumulators.Theaccumulatorsareconservativelymodeledat2300ppmforthepost-LOCAsubcriticalityanalysis.
Attachment1toC0999-11Page2Similarly,T/S3/4.5.5Basescurrentlystates,"ConsistentwiththeapplicableLOCAanalyses,thelimitsonRWSTminimumvolumeandboronconcentrationensurethat1)whencombinedwithwaterfrommeltedice,theRCS,andtheaccumulators,sufficientwaterisavailablewithincontainmenttopermitrecirculationcoolingflowtothecore,and2)thereactorwillremainsubcriticalinthecoldconditionfollowingaLOCAassumingmixingoftheRWST,RCS,ECCSwater,andsourcesofwaterthatmayeventuallyresideinthesump,withallcontrolrodsassumedtobeout."C.BasesfortheCurrentRequirementsThecurrentLOCAanalysesrequirementsarebaseduponthecoreremainingsubcriticalafter~shutdownfollowingtheoccurrenceofsuchanaccident.Thecycle-specificreloadsafetyevaluationsconfirmthatpost-LOCAsubcriticalityrequirementsaremet.Thecurrentpost-LOCAsubcriticalityanalysismethodologydoesnotcreditthenegativereactivitythatwouldbeprovidedbythecontrolrodsfollowingacoldlegLBLOCA.D.NeedforRevisionoftheRequirementsInJune1992,theNRCnotifiedtheWestinghouseOwnersGroup(WOG)ofitsconcernsgenerictopressurizedwaterreactorsregardingpossiblecorere-criticalityfollowingaLBLOCA.Inresponsetotheseconcerns,WestinghouseElectricCompany(WEC)reviewedportionsoftheaccidentwithrespecttotheboronconcentrationintheinjectedECCSliquid.WECdeterminedthatforcoldlegLBLOCAs,thebuildupofhighboronconcentrationinthereactorcorecouldresultinsignificantborondilutioninthesump.Consequently,apotentialre-criticalityconditioncoulddevelopwhenswitchoveroftheECCStohotlegrecirculationwasbeingperformed.WhenaLBLOCAoccurs,abuildupofboroninthevesselcausesanassociatedborondilutioninthesump.Atthetimeofswitchovertohotlegrecirculation,insufficientlyboratedcontainmentsumpwaterisintroducedtothetopofthecore.TheHLSOsubcriticalityanalysisconservativelyassumesthatthedilutedboronsumpliquidcompletelydisplacesthemorehighlyboratedliquidduringthetransitionfromcoldlegrecirculationtohotlegrecirculation.Therefore,ifthesumpliquidwerecalculatedtobeatorbelowthecriticalboronconcentration,corere-criticalitycouldbepostulated.Toaddressthisissue,theWOGcontractedWECtoperformanECCShotlegrecirculationeliminationanalysis.Theobjectiveoftheanalysiswastoevaluateand,ifpossible,justifytheeliminationofECCShotlegrecirculationfollowingaLOCA.Theresultinganalysis,whichwasdocumentedinWCAP-14486,"ECCSHotLegRecirculationEliminationforWestinghouse3and4LoopDesign[NuclearSteamSupplySystem]NSSS,"modeledRCSflowthroughthegapbetweenthecorebarrelandvesselatthehotlegnozzle.Thishotlegnozzlegapflowwasviewedasawaytooffsettheeffectsofboronconcentratinginthereactorvesselandtherebyeliminatetheneedforrealignmenttohotlegrecirculation.
Attachment1toC0999-11Page3Inthefallof1997,CNPidentifiedcontainmentsumpdesignissuesonUnits1and2thatadverselyaffectedtheHLSOcriticalitycalculation.Asaresult,thesumpdilutioneffectassociatedwiththepartitioningoffluidbetweentheactiveandinactivesumpvolumeswastobeoffsetbytakingcreditfortheboratedcoolantflowthroughhotlegnozzlegaps,asdocumentedinWCAP-14486.ThischangeinapproachwaspresentedinaletterfromI&MtoNRC,AEP:NRC:1260G4,"ConfirmatoryActionLetter(CAL)SupplementalResponse,"datedDecember24,1997.Duringthesummerandearlyfallof1998,WECconcludedthatconcernsraisedduringtheNRCreviewofWCAP-14486madedefenseofthemethodologyimpractical.WECrecommendedthattheWCAPbewithdrawn.FollowingWOGconcurrence,theWCAPwaswithdrawninOctober1998.Inlate1998,aflerthewithdrawalofWCAP-14486,WECassessedwhethersubcriticalityatthetimeofswitchovertohotlegrecirculationforCNPcouldbeassuredwithouttakingcreditforthehotlegnozzlegaps.Atthattime,subcriticalitycouldbeensuredforUnit1(forthecurrentfuelcycle)bytakingcreditforexistingburnupofgreaterthan4000megawattdayspermetrictonneofinitialuraniummetal(MWD/MTU).However,subcriticalityatthetimeofHLSOcouldnotbedemonstratedforUnit2sinceithasafreshreactorcore.I&MmetwiththeNRConMay6,1999,tooutlineastrategyforcreditingtheadditionofnegativereactivitythroughcontrolrodinsertionafteracoldlegLBLOCA.Duringthemeeting,theWECanalysistechniquesandpreliminaryconclusionswerepresentedtodemonstrateacceptabilityofthecontrolrodinsertionapproach.Theresultingnegativereactivityavailabletopreventre-criticalityatthetimeofHLSOwouldbeapproximately400ppmormore(boronrodworth),dependinguponplantdesign.ThestrategiesoutlinedduringtheMay6,1999,meetinghavebeenanalyzedandareaddressedinAttachments6(WCAP-15245,"ControlRodInsertionFollowingaColdLegLBLOCA,D.C.Cook,Units1and2,"aproprietaryversion)and7(WCAP-15246,"ControlRodInsertionFollowingaColdLegLBLOCA,D.C.Cook,Units1and2,"anon-proprietaryversion)ofthisamendmentrequest.Inaddition,severalquestionsraisedattheMay6,1999,meetingthatwerenotansweredatthetimeareprovidedwithresponsesinAttachment8.E.DescriptionoftheProposedChangesI&MproposestocreditRCCAnegativereactivity,discountingtheworthofthemostreactiverod,followingapostulatedcoldlegLBLOCAinthere-criticalityanalysisforI-ILSO.TheproposedmethodologychangetocreditRCCAinsertionissupportedbytheWestinghouseanalysisprovidedasAttachments6and7.TheBasesforUnit1andUnit2T/S3/4.5.5wouldberevisedtoallowcreditforRCCAinsertionaspartofthebasisforconcludingthatthereactorwillremainsubcriticalinthecoldconditionfollowingacoldlegLBLOCAwhenHLSOisperformed.Similarly,thepertinentsectionsoftheUFSARwouldberevisedtoreflectthecreditofRCCAsforcriticalitycontrolfollowingacoldlegLBLOCAatthetimeofHLSO.
Attachment1toC0999-11F.BasesfortheProposedChangesPage4Theproposedchangemodifiesthemethodologyusedinthepost-LOCAsubcriticalityanalysisduringtherealignmentfromcoldlegrecirculationtohotlegrecirculation.Theprovisionsof10CFR50,AppendixK,allowcontrolrodstobecreditediftheirinsertioniscalculatedtooccur.AnalysesdemonstratingthattheCNPcontrolrodscanbeinsertedfollowingacoldlegLBLOCAhavebeenpreparedandareprovidedinAttachments6and7.TheseanalysesaddressreactorvesselcomponentstructuraldistortioninaLOCAenvironmentcoincidentwithaseismicevent.Plant-specificseismicresponsespectraandplant-specificdesignparametersfortheCNPwereused.BasedonAttachments6and7,I&Mhasreachedthefollowingkeyconclusions:1.ForbothUnits1and2,theRCCAupperinternalsguidetubecalculatedloadsarewithinallowablelimits,asestablishedbytestsperformedbyWEC,suchthatcontrolrodinsertionwillnotbeprecludedforeitherthelimitingleak-before-break(LBB)criteriabreaklocationsorthedesignbasiscoldlegbreaks.2.Baseduponcalculatedloadsandmeasuredgridloadallowables,fuelassemblygriddistortionwillnotinhibitcontrolrodinsertionforeitherLBBcriteriabreaklocationsorthedesignbasiscoldlegbreaks.Basedontheaboveconclusionsitisacceptabletocreditthenegativereactivityassociatedwiththeinsertionofthecontrolrodsinthepost-LOCAHLSOsubcriticalityanalysisforlargecoldlegbreaks.'fhecycle-specificreloadsafetyevaluationsdocumenttheconfirmationofpost-LOCAsubcriticalityincompliancewiththelong-termcoolingrequirementsof10CFR50.46.G.ProbabilisticRiskAssessmentoftheProposedChangeTheHLSOevolutionisnotspecificallymodeledinthecurrentCNPprobabilisticriskassessment(PRA).However,itisestimatedbelowthattheprobabilityofacoldlegRCSbreaklargeenoughtoresultinsumpdilutionplusafailureoftheRCCAstoinsertisconsiderablylessthan1.0x10-6peryear.ThisresultisbasedoncombiningtheprobabilityofthespectrumoflargeRCSbreaks,fromthelargestdouble-endedcoldlegguillotinerupturedowntoasix-inchequivalentdiameterholeintheRCS(5.0x10-6peryearfromNUREG/CR-5499),withengineeringjudgementthatthefailureofmultipleRCAAstoinsertwouldbeconsiderablylessthat1.0x10-1peryear.ThisissupportedbytheWECanalysiscontainedinWCAP-15245(Attachment6)andWCAP-15246(Attachment7)thatshowthatcommonmodefailureoftheRCAAstoinsertduetocoldlegLBLOCAandseismicforcesisnotcredible.
Attachment1toC0999-11Page5H.ImpactonPreviousSubmittalsNoprevioussubmittalsareaffectedbytheproposedchange.ImpactonEmergencyOperatingProceduresTheCNPEmergencyOperatingProcedures(EOPs)relatedtoLOCAresponsedirecttheoperatorstoperformtheswitchovertohotlegrecirculation.ThemaximumHLSOtimeisdeterminedbased'ononeoftwoissues.Oneistheneedtopreventexceedingaboronconcentrationlimitof23.5weight-percentinthecoretoprecludeboronprecipitation,andtheotheristheneedtoensurenoreturntocriticalityasdilutedsumpliquiddisplacesthecoolantinthereactorvessel.ThecurrentCNPEOPs,aswellastheCNPUFSAR(Sections6.2.2and14.3.1foreachunit),establishthemaximumtimeallowedtotransitiontoHLSOasbasedonboronprecipitationconcernsinthevesselbeingmorelimitingthanre-criticalityconcerns.RecentHLSOsubcriticalityanalyses,whichdonotcreditRCCAinsertion,demonstratethatthetimetoperformthehotlegrecirculationalignmentmust.occurmuchsoonertoprecludere-criticality.CreditforRCCAinsertion,asrequestedinthissubmittal,wouldremovethere-criticalityconcernfrombeingthebasisforthemaximumHLSOtime.Thus,theallowedmaximumtimethatHLSOmustbeperformedwillreturntobeingbasedontheprecipitationlimitsandwillprovidealargeroperatortimeresponsewindowtoperformrealignmenttohotlegrecirculation.