ML17261B032

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Forwards Annual Rept of ECCS Model Revs as Applicable to Facility,Per 10CFR50.46.Mods to Model for Small Break LOCA Do Not Affect Calculated Peak Clad Temp
ML17261B032
Person / Time
Site: Ginna Constellation icon.png
Issue date: 03/28/1990
From: MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To: JOHNSON A R
Office of Nuclear Reactor Regulation
References
NUDOCS 9004130169
Download: ML17261B032 (11)


Text

ACCELERATEDDISTjUBUTIONDEMONSHRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9004130169DOC.DATE:90/03/28NOTARIZED:NOFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterGAUTH.NAMEAUTHORAFFILIATIONMECREDY,R.C.RochesterGas6ElectricCorp.RECIP.NAMERECIPIENTAFFILIATXONJOHNSON,A.R..ProjectDirectorateI-3

SUBJECT:

ForwardsannualreptofECCSmodelrevsasapplicabletofacility,per10CFR50.46.DISTRXBUTIONCODE:A001DCOPIESRECEIVED:LTRENCLSIZE:TITLE:ORSubmittal:GeneralDistributionNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).DOCKET0500024405000244.SRECIPIENTIDCODE/NAMEPDl-3LAJOHNSON,AINTERNAL:NRR/DET/ECMB9HNRR/DST8E2NRR/DST/SXCB7ENUDOCS-ABSTRACTOGC/HDS2RES/DSIR/EIBEXTERNAL:LPDRNSICCOPIESLTTRENCL11551111111110111111RECIPIENTIDCODE/NAMEPD1-3PDNRR/DOEA/OTSB11NRR/DST/SELB8DNRR/DST/SRXB8EEMBREGLE01NRCPDRCOPIESLTTRENCL1"1111111101111ANDDPs9~<rmo7RANOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTElCONTACTTHE.DOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROM'DISTRIBUTIONLISISFORDOCUMENTSYOUDON'TNEEDITOTALNUMBEROFCOPIESREQUIRED:LTTR21,ENCL19S A~fg4,hg'l>>~)VIAle~IPJkCcf1~)~<,iJi/(*-P'(IJlfl 0i)l/IIIIIIIIIIIIIIlillllllE/Ii/ANO/jjIIIII/jjjjjIIIISZZZuIl(liltiiZikllIIIIIII/ROCHESTERGASANDELECTRICCORPORATIONo89EASTAVENUE,ROCHESTER,NY.14649.0001March28,1990TELEPNONEAREACOOK7ld546-2700U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:Mr.AllenR.JohnsonPWRProjectDirectorateI-3Washington,D.C.20555

Subject:

10CFR50.46AnnualReportECCSEvaluationModelRevisionsR.E.GinnaNuclearPowerPlantDocketNo.50-244

Reference:

1)NS-NRC-89-3463,"10CFR50.46AnnualNotificationfor1989ofModificationsintheWestinghouseECCSEvaluationModels",LetterfromW.J.Johnson(Westinghouse)toT.E.Murley(NRC),Dated.October5,1989.2)NS-NRC-89-3464,"CorrectionofErrorsandModificationstotheNOTRUMPCodeintheWestinghouseSmallBreakLOCAECCSEvaluationModelWhichArePotentiallySignificant",LetterfromW.J.Johnson(Westinghouse)toT.E.Murley(NRC),DatedOctober5,1989.

DearMr.Johnson:

ThisletterprovidestheannualreportofEmergencyCoreCoolingSystem(ECCS)modelrevisionsastheyapplytoR.E.Ginna.ZnReferences1)and2),WestinghouseElectricCorporationprovidedinformationregardingmodificationstotheirECCSevaluationmodelstoNRCStaff.References1)and2)describethegenericeffectsofthemodelrevisionsforbothlargeandsmallbreakLossOfCoolantAccidents(LOCA).TheattachmenttothisletterprovidesinformationregardingtheeffectsoftheECCSevaluationmodelmodificationsontheGinnaUFSARChapter15.6.4LOCAanalysis.ModificationstothemodelcausethelargebreakLOCAPeakCladTemperature(PCT)toincreaseby2Fto1889F.9004i30i6990032SPDRADOCK05000244RPDCip'gget5/44'/

ModificationstothemodelforsmallbreakLOCAdonotaffectcalculated.peakcladtemperature.Verytrulyyours,RobertC.MecredyDivisionManagerNuclearPr'oductionRWEi088Enclosuresxc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector ATT'O10CFR50.46ANNUALPORTEffectofWestinghouseECCSEvaluationModelModificationsontheLOCAAnalysisResultsFoundinChapter15.6.4oftheR.E.Ginna(RG&E)NuclearPowerPlantUpdated,FinalSafetyAnalysisReportand.WCAP-11609ContainingtheSteamGeneratorTubePluinReortforGinnaNuclearPowerStationTheOctober17,1988revisionto10CFR50.46requiredapplicantsandholdersofoperatinglicensesorconstructionpermitstonotifytheNuclearRegulatory'ommission(NRC)oferrorsandchangesintheECCSEvaluationModelsonanannualbasis,whentheerrorsandchangesarenot.significant.Reference1definesasignificanterrororchangeasonewhichresultsinacalculatedpeakfuelcladdingtemperaturedifferentbymorethan50'Ffromthetemperaturecalculatedforthelimitingtransientusingthelastacceptablemodel,orisacumulationofchangesanderrorssuchthatthesumoftheabsolutemagnitudesoftherespectivetemperaturechangesisgreaterthan50'F.InReferences2and3,informationregardingmodificationstotheWestinghouselargebreakandsmallbreakLOCAECCSEvaluationModelswassubmittedtotheNRC.ThefollowingpresentsanassessmentoftheeffectofthemodificationstotheWestinghouseECCSEvaluationModelsontheLoss-Of-CoolantAccident(LOCA)analysesresultsfoundinWCAP-11609,"SteamGeneratorTubePlugging(SGTP)ReportforGinnaNuclearPowerStation",October1987andChapter15.6.4oftheR.E.Ginna(RG&E)NuclearPowerPlantUpdatedFinalSafetyAnalysisReport.LARGEBREAKLOCA-EVALUATIONMODELCHANGESThelargebreakLOCAanalysisforR.E.Ginna(RG&E)wasexaminedtoassesstheeffectoftheapplicablemodificationstotheWestinghouselargebreakLOCAECCSEvaluationModelonPeakCladdingTemperature(PCT)resultsreported.inWCAP-11609.TheLOCAsafetyanalysesreportedintheUFSARwereperformedforGinnawithauniformSteamGeneratorTubePlugging(SGTP)levelof12'-o.Thelargebreakanalysiswassubsequentlyreanalyzedandlicensedfor15%tubepluggingand.theresultsweredocumentedinWCAP-11609,"SteamGeneratorTubePlugging(SGTP)ReportforGinnaNuclearPowerStation",October1987.ThelargebreakLOCAanalysisresultswerecalculated.usingthe1981versionoftheWestinghouselargebreakLOCAECCSEvaluationModelwhichisdocumentedinWCAP-9220-P-A(Reference4).Thecurrentlicensingbasisanalysisassumed.thefollowinginformationimportanttothelargebreakLOCAanalysisNSSSpowerlevel-102-oof1520MWtFuelType-,14X14OFAPelletEdgeConfiguration-ChamferUniformSteamGeneratorTubePluggingLevel-15%iNuclearPeakingFactorsof2.32fortheTotalPeakingFactorand1.66fortheEnthalpyRisePeakingFactor.

~~

r~~orR.E.Ginna(R),thelimitingbreakreslkedfromthedoubleended.guillotineruptureofthecoldlegpipingwithadischargecoefficientofCD=0.4.Thecalculatedpeakcladdingtemperaturewas1887'Fincludingtheapplicablepenalties.ThePCTvalueof1887'Fincludesa6'enaltytoaccountforanupperplenuminjectionand.acorecrossflowpenalty'of10'F.ThefollowingmodificationstotheWestinghouseECCSEvaluationModelwereevaluatedtodetermineiftheywouldaffectthecurrentlicensingbasis-largebreakLOCAanalysisresultsforR.E.Ginnafor15%SGTPfound.'nWCAP-11609.1981ECCSEvaluationModel:(NotMax-SILimited,)Inthe1981versionoftheWestinghouseECCSEvaluationModel,amodificationwasmadetodelaydowncomeroverfilling.Thedelaycorrespondstobackfillingoftheintactcoldlegs.Datafromtestssimulatingcoldleginjectionduringthepost-largebreakLOCArefloodphasewhichhaveadequatesafetyinjectionflowtocondenseallofthe-availablesteamflowshowasignificantamountofsubcooled.liquidtobepresentinthecoldlegpipetestsection.Thissituationcorrespondstotheso-calledmaximumsafetyinjectionscenarioofECCSEvaluationModelanalyses.TheR.E.Ginna(RGGE)LOCAanalysisperformedwiththeWestinghouse1981largebreakLOCAECCSEvaluationModelisnotaffected.bytheWREFLOODcodemodificationssincethemaximumsafeguardssafetyinjectionflowassumptionisnotlimiting.1981ECCSEvaluationModel.:(Two-LoopPlants)Inthe1981'versionoftheWestinghouseECCSEvaluationModel,thepressurizerismodeledasbeingattachedtothebroken(faulted)loopintheSATAN-VIcodeforcalculatinglargebreakblowdownbehavior.Sensitivitystudieswereperformedtodetermineifthispressurizerlocationinthenodingschemewasthemostlimitingposition.Theresultsindicatedthattwo-loopWestinghousePWRsaresensitive'tothepressurizernodallocationandthatinsomecasesmodelingthepressurizerintheintact(non-faulted)loopresulted.inaslightincreaseinthecalculatedPeakCladdingTemperature(PCT).Foratwoloopplant,corecoolingisprovidedbynegativecoreflowand.thenegativecoreflowperiod.laststhroughmostoftheremainingblowdownperiod;Theconcernregardingpressurizerlocationrelatestothenegativecoreflowperiodwhichiscrucialforcorecoolinginatwo-loopplant.Withthepressurizeronthebrokenloop,pressurizerflowisalargecontributortobreakflow(pumpside),lesseningthecontributionfromtheupperplenumandleavingalargeupperplenuminventoryfornegativecoreflowlaterinblowdown.ForGinna,apenaltyof2'Fduetomodelingthepressurizerintheintact(non-faulted)loopwasassessedtobeusedintrackingmargintothe10CFR50.46limitonthecurrentlicensingbasisanalysisfor15-oSGTPcontained.inWCAP-11609.ThePCTforthelimitingC=0.4breakis1887'Fwithapplicablepenalties,andthusaddingthe2'FincreasebringsthePCT,to1889'Fwhichiswellbelowthe10CFR50.46limit.

ksdiscussedabovmodificationstotheNestgghouselargebreakLOCAECCSEvaluationModelcouldaffecttheresultbyalteringthe~PCT.A.AnalysisCalculatedResultB.ModificationstoWestinghouseECCSEvaluationModelC.ECCSEvaluationModelModificationsResultantPCT1887'F2oF1889FSMALLBREAKLOCA-EVALUATIONMODELCHANGESThesmallbreak.LOCAanalysisforR.E.Ginna(RG&E)wasalsoexaminedtoassesstheeffectoftheapplicablemodificationstotheWestinghouseECCSEvaluationModelsonPeakCladdingTemperature(PCT)resultsreportedinChapter15.6.4.1oftheUFSAR.TheLOCAsafetyanalysesreportedintheUFSARwereperformedforGinnawithauniformSteamGeneratorTubePlugging(SGTP)levelof12%.ThesmallbreakLOCAanalysiswassubsequentlyevaluatedandlicensedforaSGTPlevelincreasefrom12:to15%.ThesmallbreakLOCAeventwasnotreanalyzedbecausetheresultsarenotsensitivetoaSGTPlevelincreasefrom12%to15:.Theevaluationwasdocumented,andtransmittedinWCAP-11609,"SteamGeneratorTubePlugging(SGTP)ReportforGinnaNuclearPowerStation",October1987.ThesmallbreakLOCAanalysisresultswerecalculatedusingtheWestinghousesmallbreakLOCAECCSEvaluationModeldocumentedinWCAP-8970(Reference12)whichutilizedtheWFLASHcomputercode.ForR.E.Ginna(RG&E),thelimitingsizesmallbreakresultedfroma6inchequivalentdiameterbreakinthecoldleg.Thecalculatedpeakcladdingtemperaturewas1092F.Theanalysisassumedthefollowinginformationimportanttothesmallbreakanalyses:NSSSpowerlevel-102%of1520MWtFuelType-14Z14OFAPelletEdgeConfiguration-ChamferUniformSteamGeneratorTubePluggingLevel-12-oNuclearPeakingFactorsof2e32fortheTotalPeakingFactorand1.66fortheEnthalpyRisePeakingFactor.600GPMTotalAuziliaryFeedwaterFlow.ThefollowingmodificationtotheWestinghouseECCSEvaluationModelwereevaluatedtodetermineiftheywouldaffectthecurrentlicensingbasissmallbreakLOCAanalysisresultsforR.E.Ginna.WFLASHECCSEvaluationModelFollowingtheaccidentatThreeMileIslandUnit2,additionalattentionwasfocusedonthesmallbreakLOCAand.Westinghousesubmittedareport,WCAP-9600(Reference5),totheNuclearRegulatoryCommission(NRC)detailingtheperformanceoftheWestinghousesmallbreakLOCAEvaluationModelwhichutilizedtheWFLASHcomputercode.InNUREG-0611(Reference6),theNRCstaffquestionedthevalidityofcertainmodelsintheWFLASH,computer

~t1'Vcodeandrequiredcenseestojustifycontinacceptanceofthemodel.SectionII.K.3.30ofNUREG-0737(Reference7),whichclarifiedtheNRCPost-TMIrequirementsregardingsmallbreakLOCAmodeling,requiredthatthelicenseesrevisethesmallbreakLOCAECCSmodelsalongtheguidelinesspecifiedinNUREG-0611.FollowingtheissuanceofNUREG-0737,WestinghouseandtheWestinghouseOwnersGroupdecidedtodeveloptheNOTRUMP(Reference9)computercodeforuseinanewsmallbreakLOCAECCSEvaluationModel(Reference10).TheNRCapprovedtheuseofNOTRUMPforsmallbreakLOCAECCSanalysesinMay1985.SinceapprovaloftheNOTRUMPsmallbreakLOCAECCSEvaluationModelin1985,theWFLASHcomputercodehasnotbeenmaintainedas.partoftheWestinghouseECCSEvaluationModelcomputercodes.InsectionII.K.3.31ofNUREG-0737,theNRCrequiredthateachlicenseesubmitanewsmallbreakLOCAanalysisusinganNRCapprovedsmallbreakLOCAEvaluationModel.whichsatisfiedtherequirementsofNUREG-0737sectionII.K.3.30.NRCGenericLetter83-35(Reference8)relaxedtherequirementsofItemII.K.3.31byallowingamoregenericresponseandprovidingabasisforretentionoftheexistingsmall,breakLOCAanalyses.ProvidedthatthepreviouslyexistingmodelresultsweredemonstratedtobeconservativewithrespecttothenewsmallbreakLOCAmodelapprovedundertherequirementsofNUREG-0737II.K.3.30(NOTRUMP),plantspecificanalysesusingthenewsmallbreakLOCAEvaluationModelwouldnotberequired.InWCAP-11145(Reference11),WestinghouseandtheWestinghouseOwnersGroupdemonstratedthattheresult'sobtainedfromcalculationswithWFLASHwereconservativerelativetothoseobtained.withNOTRUMP.CompliancewithItemII.K.3.31ofNUREG-0737couldbecompletedbyreferencingWCAP-11145andsupplyingsomeplantspecificinformation.Westinghouse,therefore,hasnotbeenmodifying,investigating,orevaluatingproposedchangestotheWFLASH.smallbreakLOCAECCSEvaluationModel.Asdiscussedabove,noneofthemodificationstotheWestinghousesmallbreakLOCAECCSEvaluationModelwouldaffectthesmallbreakLOCAanalysisresultsbyalteringthePCT.A.AnalysisCalculatedResultB.ModificationstoWestinghouseECCSEvaluationModelC.ECCSEvaluationModelModificationsResultantPCT1092'F+0oF1092'FCONCLUSIONAnevaluationoftheeffectofmodificationstotheWestinghouseECCSEvaluationModelasreportedinReferences2and3wasperformedforboththelargebreakLOCAandsmallbreakLOCAanalysesresultsfoundinWCAP-11609andChapter15.6.4oftheR.E.GinnaNuclearPowerPlantUpdatedFinalSafetyAnalysisReport.TheLOCAsafetyanalysesreportedintheUFSARwereperformedforGinnawithauniformSteamGeneratorTubePlugging(SGTP)levelof12-o.ThelargebreakLOCAanalysiswassubsequentlyreanalyzedandlicensedforanincreaseto15:tubeplugging.ThesmallbreakLOCAanalysiswasevaluatedandwasnotimpactedbytheincrease inSGTPlevelto.Theresultsoftheanaesandevaluationsfortheincreasein.SGTPlevelto15-oweredocumentedinWCAP-11609,"SteamGeneratorTubePlugging(SGTP)ReportforGinna.NuclearPowerStation".WhentheeffectsoftheECCSmodelchangeswerecombinedwiththecurrentplantanalysisresults,itwasdeterminedthatcompliancewiththerequirementsof10CFR50.46wouldbemaintained.

REFERENCES2.3.4.5.6.7.8.9.10.12."EmergencyCoreCoolingSystems;RevisionstoAcceptanceCriteria",FederalRegister,Vol.53,No.180,pp.35996-36005,datedSeptember,16,1988.NS-NRC-89-3463,"10CFR50.46AnnualNotificationfor1989ofModificationsintheWestinghouseECCSEvaluationModels,"LetterfromW.J.Johnson(Westinghouse)toT.E.Murley(NRC),dated.October5,1989.NS-NRC-89-3464,"CorrectionofErrors.andModificationstotheNOTRUMPCodeintheWestinghouseSmallBreakLOCAECCSEvaluationModelWhichArePotentiallySignificant",LetterfromW.J.Johnson(Westinghouse)toT.E.Murley(NRC),datedOctober5,1989.WCAP-9220-P-A,Revision1(Proprietary),WCAP-9221-A,Revision1(Non-Proprietary),"WestinghouseECCSEvaluationModel1981Version",1981,Eicheldinger,C.WCAP-10924-P-A(Proprietary),WCAP-12130-A(Non-Proprietary),"WestinghouseLargeBreakLOCABestEstimateMethodology",Hochreiter,L.E.,et.al.,January1987.ReportonSmallBreakAccidentsforWestinghouseNuclearSteamSupplySystem",WCAP-9601(Non-Proprietary),June1979,WCAP-9600(Proprietary),June1979."GenericEvaluationofFeedwaterTransientsandSmallBreakLoss-of-CoolantAccidentsinWestinghouseDesignedOperatingPlants",NUREG-0611,January1980."ClarificationofTMIActionPlanRequirements",NUREG-0737,November1980."ClarificationofTMIPlanItemII.K.3.31,"NRCGenericLetter83-85fromD.G.Eisenhut,November2,1983."NOTRUMP-ANodalTransientSmallBreakandGeneralNetworkCode",WCAP-10079-P-A(Proprietary),WCAP-10081-A(Non-'Proprietary),Lee,N.,et.al.,August1985."WestinghouseSmallBreakECCSEvaluationModelUsingtheNOTRUMPCode",WCAP-10054-P-A(Proprietary),WCAP-10081-A(Non-Proprietary),Lee,N.,et.al.,August1985.WCAP-8970(Proprietary)andWCAP-8971(Non-Proprietary),"WestinghouseEmergencyCoreCoolingSystemSmallBreakOctober1975Model",April1977.