ML17331B439

Cook-1 Cycle 13 IPC Assessment.

ML17331B439
Person / Time
Site:	Cook
Issue date:	06/09/1994
From:	KEATING R F, PITTERLE T A, WEPFER R M WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML17331B438	List: ML17331B437 ML17331B439
References
SG-94-05-023, SG-94-5-23, NUDOCS 9406220342
Download: ML17331B439 (43)

Text

SG-94-05-023COOK-1CYCLE13IPCASSESSMENTJune9,1994PreparedBy:T.A.PitterleR.F.KeatingR.M.WepferWestinghouseElectricCorporationNuclearServicesDivisionP.O.Box158Madison,PA156631994WESTINGHOUSEELECTRICCORPORATIONALLRIGHTSRESERVED940b22054290500051540biSPDR~DpDRP COOK-1CYCLE13IPCASSESSMENTTABLEOFCONTENTSTOPIC

1.0INTRODUCTION

PAGE2.0SUMMARYANDCONCLUSIONS2.1OverallConclusions2.21994EOC-13InspectionResults2.3VoltageGrowth2.4ComparisonofProjectedandActualEOC-13BobbinVoltageDistributions3.0EOC-12ANDEOC-13S/GINSPECTIONRESULTS3.1EOC-12InspectionResults3.2EOC-13:SummaryofIndicationsatTSPs3.3EOC-13DistributionsforComparisonswithProjections4.0BOBBINVOLTAGEINDICATIONSLEFTINSERVICE4.1BOC-13IndicationsLeftinService4.2BOC-14IndicationsLeftinService2-12-12-12-12-13-13-13-13-24-14-14-15.0VOLTAGEGROWTHRATES5.1Cycle12VoltageGrowthRates5.2Cycle13VoltageGrowthRates6.0NDEUNCERTAINTIES7.0PROJECTEDEOCVOLTAGEDISTRIBUTIONS7.1ProjectedEOC-13VoltageDistributions7.2ComparisonofProjectedandActualEOC-13Distributions7.3ProjectedEOC-14VoltageDistributions

8.0REFERENCES

5-15-15-16-17-17-17-17-28-1 I.OINTRODVCTIONThisrcportprovidesaCycle13interimpluggingcriteria(IPC)assessmcntfortheD.C.CookUnit-Istcamgcncrators.TheinformationrequcstcdintheNRCSafetyEvaluationReport(Rcf.1)forapplicationofthcIPCforCycle14isprovided,includingcomparisonsofprojectedEOC-13bobbinvoltagedistributionswithactualvaluesfoundintheEOC-13inspection,andprojectionsofEOC-14voltagedistributionsbasedonindicationsleftinserviceatBOC-14.Projectedpotentialstcamlincbreak(SLB)leakratesatEOC-14andtubeburstprobabilityatEOC-14werepreviouslyreportedinReference2,thestartupIPCletterreport.TheCook-1EOC-13S/GeddycurrentinspectionwasthcfirstinspectionfollowingimplementationofIPCrepairlimits.ThustheEOC-13inspectionprovidesanopportunitytocompareactualvoltagedistributionswithprojectedvalues.BOC-13indicationsleftinserviceareusedtoprojectEOC-13voltagedistributionsforcomparisonwiththeactualEOC-13inspectionresults.ThemethodsofdefiningBOCindicationsincludetheNRCrecommendedmethodofdraftNUREG-1477(Ref.3)whichincludesRPCNDDandadjustmcntsforaprobabilityofdetectionof0.6,andadistributionincludingRPCNDDwithnoadjustmentfordctcctionprobability.ThcMonteCarlomethodsoftheCookAPCWCAP-13187(Ref.4)areappliedtotheBOCvoltagedistributionstoprojectthcEOCdistributions.ThisisconsistentwiththeNRCguidancegiveninthcCook-1SER.S/G14isthelimitingS/GforSLBleakageandburstconsiderationsforbothCycles13and14asthisS/Ghasthelargestnumberofindicationsleftinservice.ConsistentwiththcrequestoftheCook-1SER,analysisdatasuchasvoltagedistributionsandgrowthratesarcgiveninbothgraphicalandtabulatedform.Table1-1relatesthedatarequestedinthcCook-1SERtothercportsection,tableandfigureprovidingthedata.1-1 TABLE1-1CORRESPONDENCEBETWEENSERREQUIREMENTSANDREPORTSECTIONSNRCSERSection4.510121314SubjectEOC12voltagedistribution-allbobbinind.Cycle12growthrateEOC12repairedindicationsBOC13voltagedistribution-allbobbinind.BOC13voltagedist.-draANUREG-1477BOC13voltagedist.-RPCconfirmedplusnotRPCinspectedCycle13NDEuncertaintyProj.EOC13voltagedist.-WCAP-13187Proj.EOC13voltagedist.-NUREG-1477ActualEOC13voltagedist.-allbobbinind.ActualEOC13voltagedist.-RPCconfirmedplusnotRPCinspectedCycle13growthrateEOC13repairedind.BOC14voltagedist.-allbobbinind.BOC14voltagedist.-draftNUREG-1477BOC14voltagedist.-RPCconfirmedplusnotRPCinspectedCycle14NDEuncertaintyProj.EOC14voltagedist.-WCAP-13187Proj.EOC14voltagedist.-NUREG-1477Section3.15.14.14.14.14.16.07.17.13.23.35.23.24.24.24.26.07.37.3Table3-15-2a4-14-14-14-17-17-13-27-15-2b3-24-14-14-17-27-2Figurc3-1a,b5-14-24-14-14-37-lb7-la3-3a,b7-1a,b5-23-2,3-3a,b44444-57-37-31-2 2.0,SUMMARYANDCONCLUSIONS2.1OverallConclusionsThedistributionofvoltagesfoundbyinspectionatEOC-13in1994isingoodagreementwiththcprojectionsmadeatEOC-12in1992.ThcagreementbetweenprojectedandactualvoltagedistributionsfoundatEOC-13enhancesthcconfidenceinprojectionsmadeforthecndofthenextoperatingcycle(EOC-14).EOC-14projectionsweremadeapplyingtheNRCmodelofDraftNUREG-1477todefinetheBOCdistributionwithaprobabilityofdetection(POD)adjustmentfactorof0.6.ThevoltagegrowthratesatD.C.Cook-1continuetobeverysmallwithamaximumvoltagegrowthof0.4voltsforCycle13comparedto0.49voltsforCycle12.ComparisonsbetweenprojectedandactualbobbinvoltagedistributionsatEOC-13areprovided.ThedraftNUREG-1477methodologywithaPOD=0.6adjustmenttotheBOCdistributionisconservativecomparedtotheactualvoltagedistributions.2.21994EOC-13InspectionResultsThenumberofpotentialflawindicationsfoundinthe1994inspectionwas514whichincludes156inS/G11,103inS/G12,84inS/G13and171inS/G14.ThenumberofRPCconfirmedindicationswas24ofthe77potentialindicationsRPCinspected.Forindicationsabove1.0volt,theRPCconfirmationwas18outof43potentialbobbinindicationsRPCinspected.ThustheRPCconfirmationrateforpotentiallyrepairablebobbinindicationsabove1.0voltwas42%.Theselowconfirmationratesareindicativeofconservativebobbinindicationcallingcriteria.ThelargestbobbinindicationsconfirmedbyRPCwere1.72,1.54and1.53volts.Apotentialbobbinindicationat1.77voltswasnotconfirmedasaflawindicationbyRPC.Notubeswerefoundforwhichthebobbinvoltageexceededthe2.0voltIPCrepairlimitinplaceforCycle14.2.3VoltageGrowth1Thelargestvoltagegrowthof0.40voltsfoundforCycle13wasfoundinSG-12R13C66whichhadanactualEOC-13bobbinvoltageof0.96voltsandwasnotRPCinspected.ThelargestgrowthfoundforanRPCconfirmedindicationwas0.25volts.ForCycle12,thelargestgrowthwas0.49volts.TheCycle13growthratesarclowerinaverageandmaximumvaluecomparedtopriorCook-1cyclesalthoughthegrowthsforbothcyclesareamongthesmallestfoundforplantsevaluatedforIPCapplications.Theaveragevoltagegrowthwas0.01voltsor1.4%oftheaverageBOCvoltagescomparedto0.022volt(2.2%)growthforCycle12.2.4ComparisonofProjectedandActualEOC-13BobbinVoltageDistributionsThe1994Cook-1inspectionrepresentsthefirstfullcycleofoperationfollowingIPCimplementation.ThustheresultingdatapermitscomparisonsofprojectedandactualEOCvoltagedistributions.ThesecomparisonsweremadeapplyingtheNRCdraftNUREG-1477methodologyincludingaPOD=0.6adjustmcnttodetectedindicationsandamethodincludingRPCNDDindicationswithoutaPODadjustment(allbobbinindicationsleftinservice)asdescribedinWCAP-13187.Theprojection2-1

methodsarccomparedwiththcactualEOC-13distributionforRPCconfirmedindicationsplusindic'ationsnotRPCinspected.SincethcprimarypurposeofthevoltageprojectionsforIPC/APCapplicationsistoestimatetubeleakageandburstprobabilities,onlyindicationsfoundtobeRPCconfirmed(notinspcctcdarcconservativelyassumedtobcconfirmed)arcusedforcomparisonswiththcprojcctcddistributions,sinceRPCNDDindicationswouldnothaveanysignificantprobabilityofleakageoverthcpriorcycle.ItisfoundthatthedraANUREG-1477methodologyisquiteconservativeinthenumberandmagnitudeoftheEOC-13indications.Theprojectedmaximumvoltageis2.4voltscomparedtothcactualvalueof1.6volts.Itisfoundthatthismethodologyintroducessignificantconservatisminthcvoltagedistributions.ResultsofthisevaluationareprovidedinSection7.2.2-2 3.0EOC-12ANDEOC-13S/GINSPECTIONRESULTS3.1EOC-12InspectionResultsEOC-12inspectionresultsarerequiredinthisrcporttodefinetheBOC-13indicationsleftinscrvicc.ThisprovidesthestartingpointforprojectingEOC-13voltagedistributions,whicharcthencomparedtotheactualEOC-13inspectionresults.The1992inspectionatEOC-13wasthefirstD.C.Cook-1inspectionimplementinganIPCandappliededdycurrentdatacollectionandanalysisguidelinesgiveninAppendixAofWCAP-13187.ThisincludeduseofASMEcalibrationstandardsnormalizedtothereferencelaboratorystandardandprobewearstandards.Figures3-laand3-IbandTable3-1showthcS/G14andallS/GbobbinindicationsfoundatEOC-12alongwiththeindicationsconfirmedasflawsbyRPCinspection.ThenumberofindicationsfoundinS/Gs11,12and13arefewerthanforS/G14.ForFigures3-laand3-lbandallfiguresgiveninthisreport,thevoltagevaluesgivenontheX-axisoftheplotsrepresentthcupperorright-sidevalueforthevoltagebin.IndicationsabovetheIPCrepairlimitof1.0voltwerc100%RPCinspcctcd,whileonlyasampleofindicationsbelow1.0voltswereinspected.S/G14resultshavebeenutilizedforEOC-13voltageandleakrateprojectionsbasedoncomparativeleakratecalculationswhichshowedS/G14tobethemostlimiting.Atotalof149bobbinindicationswercfoundinS/G14.Above1.0volt,24indicationswerefoundinS/G14and12wereRPCconfirmedandremovedfromservice,principallyduetoconfirmationasflawsbyRPC.Atotalof467bobbinindicationswerefoundinallfourS/Gs,87oftheseindicationshadbobbinvoltages>1.0voltand65ofthe87indicationswereconfirmedbyRPC.S/Gs11,12and13had144,112and62indications,respectively.TheindicationsleftinserviceatBOC-13arediscussedinSection4.1.Thclargestbobbinvoltagefoundintheinspectionwas2.0voltsatS/G-12R18C21IH.RPCinspectionconfirmedtheflawindicationonthistube.Thenextlargestbobbinvoltagewas1.95voltsatS/G14R30C131HwhichwasalsoconfirmedasaflawbyRPCinspection.NoindicationsatTSPswereidentifiedashavingcracksextendingoutsidetheTSPsbyeitherthebobbinorRPCinspections.Inaddition,noabnormalindicationssuchascircumfcrentially-orientedindicationswercfoundinthe1992inspection.3.2EOC-13:SummaryofIndicationsatTSPsThe1994inspectionatEOC-13wascompletedinMarch,1994.ThisinspectionisthefirstD.C.Cook-1inspectionfollowingimplementationofanIPCwhichpermittedleavingindicationsof1.0voltorlessinserviceforindicationsatTSPs.Forthisreason,theresultsoftheinspectionareevaluatedforIPCmethodologyconsiderationsincludingcomparisonsbetweenprojectedandactualindicationsinthisreport.The1994bobbinindicationswereclassifiedaspossibleindications(PIs),indicationsnotreportable(INRs)andunusualODphaseangles(UOAs).ThePIsareconsideredbobbinflawindications.IfaPIwasRPCinspected,theindicationwasfinallyclassifiedasaPCN(possibleindicationconfirmedbutnotpluggable)ifconfirmedbyRPCbutnotpluggableoraPINifnotconfirmedbyRPC.INRsarenotconsideredasbobbinflawindicationsandthisclassificationistypicallyassignedtobobbinPlsfromapriorinspectionthatarenotconsideredasapotentialflawindicationinthe1994inspection.UOAsarealsonotconsideredaspotentialflawindicationsandthisclassificationisassignedtoindicationswithsomeflaw-likeappearancebutthephaseangleislarger3-1 than,thc0%depthanglefromcalibrationagainstthcASMEstandards.IndicationsinthcIDphaseanglerangeareincludedasPlsaspriorRPCinspectionshaveindicatedthatsomeIDphaseangleindicationsareconfirmedasflawsbyRPCinspection.TheINRsandUOAsarenotincludedinthcbobbinflawdistributionsinthisreport.TheseclassificationsaremadetopermittrackingofthesetypesofsignalsbctwecninspectionsandtoincludesomeoftheseindicationsintheRPCsamplingplantoreconfirmthattheyshouldnotbcconsideredasflawindications.Thissectionsummarizesthcinspectionresults.AsummaryofthcinspectionresultsaregiveninTable3-2.Figure3-2showsthetotalforall4S/Gsofallbobbinindications,RPCconfirmedindicationsandrepairedindications.Figures3-3aand3-3bshowthecorrespondingdataforS/Gs11and14,respectively.S/G14with163indicationsleftinserviceatBOC-14isthelimitingS/GforSLBleakageanalyses.Onlyasmallfractionofthebobbinindicationsbelow1.0voltwereRPCinspected.Noindicationsexceededtheapproved2.0voltIPCrepairlimitforthisinspection.AfcwtubeswithindicationsatTSPswereremovedfromserviceduetoothercauses.BasedonTable3-2,thetotalnumberofpotentialflawindicationssummedoverall4S/Gsis514whichincludes156inS/G11,103inS/G12,84inS/G13and171inS/G14.ThetotalnumberofRPCconfirmedpotentialflawindicationsabove1.0voltis18outofabout43indicationsRPCinspectedforanRPCconfirmationrateofabout42%.Below1.0volt,6outof34indicationsRPCinspectedwereconfirmedforaconfirmationrateof18%.Table3-2includesthedistributionofRPCconfirmedindicationsandrepairedindicationsaswellasthctotalbobbinvoltagedistribution.Atotalof22indicationswererepairedincluding8inthelimitingS/G14.Table3-3providesasummaryofthclargestbobbinvoltageindicationsfoundinthecurrentinspection.RPCinspectionresults,voltagesatthepriorinspectionandwhetherornotitisanewindicationnotreportedatthclastinspectionarcalsoincludedinTable3-3.Thelargestbobbinvoltageindicationsfoundin1994were1.77and1.72,and1.54voltsinS/G12,1.53voltsinS/G11and1.52voltsinS/G14.ForS/G12,thelargestbobbinindicationof1.77voltswasfoundtobeRPCNDDandhadalsobeenRPCNDDinthe1992,EOC-12inspection.ThelargestRPCconfirmedindicationof1.72voltsinS/G12in1994wasnotRPCinspectedinthe1992,EOC-12inspection(anabnormalsignalwithafieldvoltageof0.79volts),andfoundtohavealowvoltage(0.20)RPCindicationinthecurrentinspection.Thclargestnewindication(notreportedin1992inspection)confirmedbyRPCwasthe1.53voltindicationinS/G11.AllbobbinindicationsfoundintheEOC-13inspectionwerelessthanthe2.0voltrepairlimitsuchthatnotubesrequiredrepairduetoindicationsattheTSPintersections.Ofthe5ncwindicationsinTable3-3,2wereRPCconfirmedand3wereRPCNDD.3.3ROC-13DistributionsforComparisonswithProjectionsVoltageprojectionsfromBOCtoEOCconditionsforIPC/APCapplicationsareperformedtoestimateSLBleakageandburstprobability.ThusthedesiredEOCvoltagesarcthosehavingsignificantpotentialforthroughwallcracl.sorleakage.IndicationsthatareRPCNDDatEOCcanbeexpectedtohavenegligiblepotentialforleakageoverthepriorcycleasRPCdetectability(aswellasbobbindetectability)approaches100%forODSCCatTSPswithnearthroughwallorthroughwallindications.ItcanbcnotedthattheconfidencefornoleakageoverthepriorcycleforRPCNDDishigherthanthejudgementforleakagepotentialoverthenextcyclefromRPCindicationsleftinservice(i.e.theNRCrequirementtoincludeRPCNDDinprojectedleakageanalyses).Therefore,forcomparisonsofprojectedEOC-13voltagedistributionstobeusedinleakageanalyseswithactualdistributions,theappropriateactualEOC-13voltagedistributionisthesumofRPCconfirmedindicationsandbobbin3-2 indicationsnotRPCinspected(below1.0voltforD.C.Cook-1).ThesedistributionsareshowninFigurc7-laand7-lbforS/G14whichisthelimitingS/GforSLBleakageanalysesforbothCyclesr13and14.ThcS/G14actualdistributionsofFigures7-laand7-lbforEOC-13arediscussedwithprojectionsfromBOC-13toEOC-13inSection7.3-3 Table3-1EOC-12VoltageDistributionandRPCConfirmationforSG-14andAllSGsVoltage0.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.1AllSGsNo.ofIndications001640456644476854172414108467AllSGsRPCConfirmedIndications151397868SG-14No.ofIndications00413141713182818149SG-14RPCConfirmedIndications13AEPDALL.XLSFigure3-lab Table3-2:CookI,ROC13,ComparisonofPIsFoundatTSPs,ConfirmedbyRPC,andIndicationsRepairedStcam(Icnerator11Stcam(icncrator12Steam(Iencrator13Stcam(icnerator14AllSteam(ieneratorsVolts0.0O.INo.ofNo.ofDobbinhdicationsINllcallcnsExaminedNo.ofhdicationsConfirmedNo.ofNo.ofNo.ofhdicationsBobbinhdicationsReiredhdicationsExaminedNo.ofIndicationsConfirmedNo,ol'o.ofNo.ofIndicationsBobbinIndicationsRciredIndicationsExaminedNo.ofIndicationsConlirmcdNoofNo.ofNo.ofIndicationsBobbinhdicationsRiredIndicationsExamined0NoofhdicationsConfirmedNo.ofYo.ofYoofhdicationsDobbinhdrcationsRiiredhdicationsExaminedYoofIndicationsConfirmedNoofIndicationsRcircd0.220002000.30.40.50.622242800122114013130000000000270191002200687700.7232706800.8200.916013013017015133632471301.0700017170.381717171.21.31,41.5000000003130513Total)IV10101.61.71.8Total156111038840011616171490332.2514774343241822 Table3-3.SUMMARYOFLARGESTEOC-13BOBBINVOLTAGESS/G1212121413121413141414TubeRl1cjoR11C55R8C24R6C83R11C22R15C64R11C56R11C15R31C72RSC30R29C44R21C58TSPEOC-13BobbinVolts1.771.721.541.531.521:501.401.381.351.321.321.27RPCVoltsNDD0.200.630.610.79NDDNDD0.330.27NDDNDD0.22BOC-13BobbinVolts1.501.681.581.281.421.371.331.211.391.161.261.16NetInd,No(nNo('>No('>YesNo(nYesNQ(')No(>)No>>No(nNo('>Noo>121312R21C12R8C19R6C58R11C681.271.201.191.18NDD0.530.68NDD1.210.961.330.82YesYesNo>>YesNotes:1.RPCNDDatlastinspection2.Fieldbobbinvolts<1.0atlastinspection3-6 Figure3-laD.C,Cook-1:EOC-12BobbinVoltageDistributionforAllSGsandRPCConfirmedIndications706050a40~o30K20100.10.20.30.40.50.60.70.8091.01.11.21.31.41.51.61.71.81.9202.1Volts8AllIndicationsCIRPCConfirmedIndicationsFigure3-1bD.C.Cook-1:EOC-12SG-14BobbinVo)tageDistributionandRPCConfirmedIndications302520l5O10'00.1020.30.40.50.6070.80.91.01.11.21.31.41.51.61.71.81.9202.1VoltsSAllIndications0RPCConfirmedIndicationsAEPDALL.XLSFigurc3-lab3-7 Figure3-2.D.C.Cook-1:ROC-13,AllS/GsBobbinVoltageDistributions908070cn60Og50C40OO3020100P0.00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.8VoltsI0AllBobbinInd.EIRPCConfirmedInd.0RepairedInd.lAEPDATA.XLSFig3-23-8 Figure3-3a.D.C.Cook-1:EOC-13SG11BobbinVoltageDistributions3025o2015FHOo100I0.00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.8Volts8AllBobbinInd.HRPCConfirmedInd.QRepairedInd.Figure3-3b.D.C.Cook-1:EOC-13,SG14BobbinVoltageDistributions302552015O100.00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.8VoltsRlAllBobbinInd.ElRPCConfirmedInd.0RepairedInd.AEPDATA.XLSFig3-3a3-9 4.0.iBOBBINVOLTAGEINDICATIONSLEFTINSERVICE4.1BOC-13IndicationsLeftinScrviccThcindicationslcl'tinscrviccatBOC-13arcusedtoprojectthcEOC-13voltagedistributionforcomparisoniviththcactualdistributionsfoundattheEOC-13inspection,asdcscribcdinSection3.2,TheBOC-13distributionsarcgivenforS/G-I4,whichwasthclimitingS/GwithregardtothenumberandsizeofindicationsleftinserviceforpotentialleakageconsiderationsinCycle13.TivorepresentationsoftheBOC-13distributionsarcutilizedinthisrcportandarepresentedinthissection.TheD.C.Cook-1NRCSERrequiresthatthcindicationsl'oundinthcinspectionbcdividedbyaprobabilityofdetection(POD)of0.6andthenrcduccdbythcindicationsrepairedtodefinethcBOCdistribution.BobbinindicationsfoundtobeNDDb>RPCinspectionarcconservativelyincludedasindicationsleftinservice.TheNRC-requireddistributionwithaPODof0.6appliedisshowninTable4-1andinFigure4-1.AseconddistributionisalsoincludedinTable4-1andFigurc4-1,whichisthcsameasthcNRC-requireddistributionexceptthatthereisnoadjustmentforPOD.Thatis,theseconddistributionincludesalldetectedbobbinindicationsnotrepairedindependentofRPCconfirmation.ThelargestRPCNDDindicationleftinscrviccis1.4volts,however,thePODadjustmentresultsin1.3indicationsat2.0voltsleftinservice.BothdistributionsincludeRPCNDDindicationsleftinservice.SincethePODadjustmentisappliedbeforethcdistributionisreducedforrepairedtubes,thePODadjusteddistributionshowsmorcindicationsthanisobtainedbydividingallbobbinindicationsleftinserviceby0.6.Forexample,thcadjusteddistributionincludes1.3indicationsat2.0voltxvhichisobtainedbydividingthetwoindications(bothRPCconfirmedandrepaired)by0.6toobtain3.3indicationsivhichisthenreducedby2.0,sincetheseindicationswercrepaired.Theeffectofthisconservativemethodologyisequivalenttoassumingthatoneandonc-third2.0voltindicationsweremissedintheinspectioneventhoughthelargestindicationswerefoundandrepaired.AsrequiredbytheCook-1SER,theEOC-12repairedindicationsforSG-14areprovidedintabularforminTable4-1(shownunderBOC-13columnasRepairedIndications)andarcalsoshowninFigure4-2.AlsorequiredbytheSERistheBOC-13voltagedistributionofindicationsthatwerc"confirmedbyRPCtobecrack-likeornotRPCinspected";thesearcprovidedinTable4-1andFigure4-3.TheFigure4-3distributionisthesameastheFigure4-1distributionofallBOC-13bobbinindications,butexcludesfiftccnindicationswhichwerefoundtobeRPCNDD.TheRPCconfirmedplusnotRPCinspecteddistribution,althoughnotutilizedintheanalysis,identifiessomeoftheconservatismofincludingallRPCNDDindicationsintheBOCdistribution.4.2BOC-14IndicationsLeftinServiceBobbinvoltagedistributionsforBOC-14weredevelopedinthesamemannerandforthecomparabletivodistributionsasdescribedaboveforBOC-13.ThereferencedistributionsincludeallbobbinsignalsindependentofRPCconfirmationthatwereleftinservice.S/G14isthelimitingS/GforCycle14leakageconsiderations,whichwasdeterminedbyperformingleakagecalculationsfortheactualEOC-13voltagedistributions.S/G14hadthehigherEOC-13leakrateofallSGs,andthesameresultwouldbeexpectedatEOC-14.4-1 ThcQOC-14bobbinvoltagedistributionsforSG-14arcgiveninTable4-1andshosvninFigurc4-4,ItisscenthatthcPOD=0.6adjusteddistributionincludesadditionaltubesinservicethatarcnotprcscntinthcunadjusteddata.ThclargestbobbinindicationleftinserviceatBOC-14divasinthc1.6voltbin(bctivccn1.51and1.6volts).Inthiscase.thclargestBOC-14indicationleftinscrviccisthesameivithandivithoutthcPODadjustmcntsincenoneofthcscindicationsivcrerepairedatthisoutage.ThcdistributionsofFigurc4-4arcappliedinSection7toobtaintheprojcctcdEOC-l4voltagedistributions.Figures4-5providesthcrequestedBOC-14distributionofRPCconfirmedplusnotRPCinspectedindications.ThisdistributionisprovidedasrequiredbytheSERandagainidentifiessomeoftheconservatismofincludingallRPCNDDindicationsintheBOCdistribution.4-2 Table4-1:DistributionofIndicationsforSG-14atBOC-13andBOC-14BOC-13olBOC-14")Volts0.10.20.3AllIndicationsRcpaircdIndicationsAllBobbinBOC-13RPCConfirmedPlusNotRPCInspectedPOD~0.6BOC-13(aspcrNRCSER)0.00.06.7AllIndicationsRepairedIndicationsAllBobbinBOC-14RPCPOD~0.6ConfirmedPlusBOC-14NotRPC(asperNRCInspccedSER)0.03.312.30.40.50.60.70.80.91.01.21.31.41.51.61.71.81.92.0Totals1314171318281814918121317131825171311213161317241711620.722.328.321.730.043.729.03.011.36.3400.70.70.00.70.01.3230.32319272717151717123172627171316163221627271512837.329.745.045.028.323,027.312.35.01.75.00.01.70.00.00.00.0277.0'ieldvoltagesforDI'sreportedin1992.s'94voltagesofPl,PIN,andPCNreportedin'94.AEPSUM.XLSSG14-BOC,EOC4-3 45Figure4-1BOC-13DistributionofAllSG-14IndicationsReturnedtoService(POD=1.0)vs.NRCSERDistributionwithPOD=0.64035g30252015100.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.0Voltage8AllBobbinIndications0NRCSERDistributionAEPSUM.XLSFig4-1 Figure4-2.EOC-12SG-14RepairedIndications107O65OL4K300.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.0VoltageAEPSUM.XLSFig4-24-5 Figure4-3.BOC-13SG-14IndicationsRPCConfirmedPlusNotRPCInspected(POD=1.0)3025oc20'a15O10II0.10.20.30.40.50.60.70.80.91.01.11.2VoltageIAEPSUM.XLSFig4-34-6 50Figure4-4BOC-14DistributionofAllSG-14IndicationsReturnedtoService(POD=1.0)vs.NRCSERDistributionwithPOD=0.64035cc3025O2015100.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.0Voltage8AllBobbinIndicationsClNRCSERDistributionAEPSUM.XLSFig444-7 Figure4-5.BOC-14SG-14IndicationsRPCConfirmedPlusNotRPCInspected(POD=1,0)302520~W'a15OE10I0.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.6Voltage4AEPSUM.XLSFig4-54-8 5,0VOLTAGEGROWTHRATES5.1Cycle12VoltageGrowthRatesVoltagegrowthratesforCycle12weredevclopcdatEOC-12byasingleanalyst.Theuscofasingleanalystprovidesconsistencytotheanalysisandenhancesthcaccuracyofthegrowthdata.ThcevaluationincludedcalibrationcorrectionsfornormalizingASMEstandardvoltagestotherefcrcncelaboratorystandardusedinthcAPCdatabasedevelopment.Thesedatawereusedtodevelopgrowthdistributions.NocyclelengthadjustmentsweremadetotheCycle12growthrates;theCycle12operatingperiodwas455EFPD.Figure5-1showsthcCycle12voltagegrowthdistribution.Thclargestgrowthvaluewas0.49voltsandfoundforonlyoncindication.Only4indicationshadvoltagegrowthvalues>0.3volt.Table5-1summarizesthcaveragegrowthratesforCook-1Cycles12and13.Table5-2apresentsthecumulativegrowthdistributionforCycle12.TheCycle12(1990to1992)averagegrowthwas0.02voltor2.2%oftheBOC-12averageof1.00volt.TheavcragcgrowthforBOCindications(0.75voltwas12%whiletheaveragegrowthforindications>0.75voltswasonly1%.(Note:Oneindicationwasdeletedfromthc1992growthstudybasedonre-review;ithadagrowthvalueveryneartothcmeanandthereforenegligibleeffectontheoverallgrowthdistribution.)5.2Cycle13VoltageGrowthRatesTheCycle13voltagegrowthratesweredevelopedutilizingthe1994fieldanalysisdataandasingleanalysttoreevaluatethe1992dataforthesameindications.Again,thcuscofasingleanalystprovidesconsistencytotheanalysisandenhancestheaccuracyofthegrowthdata.Reference4AppendixAguidelineswereusedinthe1994inspectionincludingcrosscalibrationofthefieldASMEstandardstothereferencelaboratorystandard.Growthratesweredevelopedforallpotentialflaws(PI,PIN,PCNclassifications).INRandUOAsignals,whicharenotconsideredtobeflawindications,werealsoanalyzedbutnotincludedinthcgrowthrateanalysis.TheCycle13growthdistributionisshowninFigure5-2,andTable5-2bpresentsthecumulativegrowthdistributionforCycle13.Thelargestgrowthvalueis0.4voltswhichislowerthanthevalueof0.49voltsfoundforCycle12.Cycle13showsonly2growthvalues>0.3volt,ascomparedto4forCycle12.ThemedianbinforbothCycles12and13is0.1volts.ThemoreconservativeCycle12growthdistributionofFigure5-1isusedtoprojectBOC-14indicationsleftinservicetoEOC-14conditions,asdescribedinSection7.Table5-3showsthebobbinandRPCresultsforindicationswithagrowthrate>0.20volts.Alsoshowniswhethertheindicationwasanewindicationreportedinthe1994inspection.Fiveofthe20indicationswiththelargestgrowthrateswereconfirmedbyRPC,andfiveofthe20indicationswereRPCNDD;theremainingwerenotRPCinspected.Sevenoftheindicationswerenewindicationsinthe1994inspection.Table5-1summarizestheaveragevoltagegrowthratesforCycle13(1992to1994).Theaveragegrowthrateis0.01voltsor1.4%forCycle13whichisslightlysmallerthanthe2.2%foundforCycle12.TheaverageBOCvoltageforCycle13was0.64volts,comparedto1.00voltsforCycle12.5-1 Figurc5-3andTable5-1illustratethcgrowthratesforSG11through14.AlthoughSG14hasthcgrcatcrnumberofindications,theaveragegrowthrateforthisSGwasessentiallyzeroforCycle13.SG12growthratesat4.2%wercweightedbysomeofthelargergrowthvaluesseeninTable5-3,butaveragedonly0.03volts.Figurc5-4providesacomparisonofthcCycle12andCycle13growthdistributions.Cycle13showslowergrowthratesthanthatofCycle12overmostoftherange,aswellasatthemaximumvalues.ThedccrcasinggrowthratetrendsfortheCookS/GsindicatetheeffectofrecentplantoperationssuchaschemistryandcleaningeffortstocontrolandrcduccthegrowthofODSCCatTSPintersections.5-2 Table5-1.AvcragcVoltageGrowthPcrCycleforCook-1CycleNumberIndicationsAvcragcBOCVoltageAvcragcdVGrowth/CyclePercentGrowthCycle12:'90-'92AllIndications2011.000.022.2%Va~<0.75VVaoc>075VCycle13:'92-'94301710.671.070.080.0112%1%SG-11AllIndicationsVaoc<0.75VVa~>0.75VSG-12AllIndicationsVa~<0.75VVB~>0.75V1561154110373300.620.520.920.640.500.990.010.000.020.03D.pl0.080.84.2%SG-13AllIndicationsV,<0.75VVa0c>0.75V8454300.650.480.950.020.010.032SG-14AllIndicationsV<0.75VVaoc>0.75V171114570.660.510.96-0.000.02-0.00-p.pAllSGsAllIndicationsYa~<0.75VVa~>0.75V5143561580.640.500.950.01-D.OD0.031.4%5-3 Table5-2aCook-1Cycle12GrowthDistribution-AllSGsVoltage-0.50-0.40-0.30-0.20-0.100.000.100.200.300.400.50No.16577134Cum.%pp0.5%1.0%5.5%13.4%418%771%94.0%98.0%9S.5%100.0%Cumulative2784155189197198201Note:NegativegrowthsarenotincludedinapplicationsforprojectingEOCdistributions.Table5-2bCook-1Cycle13GrowthDistribution-AllSGsVoltage-0.30-0.20-0.100.000.100.200.300.40No.16501802005214Cum.%0.0%3.1%12.S%47.9%86.8%969%99.6%100.0%Cumulative1666246446498512514Note:NegativegrowthsarenotincludedinapplicationsforprojectingEOCdistributions.5-4 Table5-3.SummaryofLargestBobbinVoltageGrowthRatesforCook-1Cycle13EOC13SG1212131112111212141111121214141411121313Row13ll394011688382254481152981110Col66682340708331941616618619223054135383TSP2H1H2H2H2HIH2H1H1H1H1H1H1H3H3H3H1H1H3H2HBobbinVolts0.961.180.971.031.771.531.131.200.870.730.940.930.621.140.990.850.550.790.860.89RPCVoltsN.I.NDDN.I.NDDNDD0.61<')0.570.53NDDN.I.N.I.N.l.N.I.0.260.36NDDN.I.N.I.N.I.N.I.BOC13BobbinVolts0.560.820.670.761.501.280.880.960.630.500.720.710.410.930.780.640.350.590.660.69VoltageGrowth(Volts)0.400.360.300.270.270.250.250.240.240.230.220.220.210.210.210.210.200.200.200.20NewIndicationYcsYesNoNoNoYesNoYesNoYesNoNoNoYesNoNoYesNoNoNoN.I.=NotRPCInspected.t'iTuberepaired.<<AEPDALL.XLSTS-25-5 Figure5-1Cook-1Cycle12ODSCCGrowthDistribution80-100.0%70~60P.50~PC40030201001116573431-90.0%80.0%-70.0%60.0%50.0%ci40.0%V300%-20.0%10.0%II-0.50-0.40-0.30-0.20-0.100.000.100.200.300.400.50VoltageGrowth(V)0.0%EKKINO.~Cum.%COOK9092.XLS'yclel2Chut25-6

~%,~Figure5-2Cook-1Cycle13GrowthDistribution250100.0%900%200180-800%70.0%o150cc0o100K505052600%C4500%c4400%G300%200161410.0%IVII-0.30-0.20-0.100.000.100.200.300.40VoltageGrowth(V)0.0%EK3NO.~Cum.%lAEPDATA.XLS'EPCycleL3Chartl5-7 80Figure5-3Cook-1Cycle13PIGrowthRatesbySG(514PIs)7060r50~WCC4020101IIII-0.30-0.20-0.100.000.100.200.300.400.500.600.70VoltageGrowth(V)IISG-IClSG-2SSG-3HSG-4AEPDATA.XLS'EPCyclel3Chart45-8 Figure5-4ComparisonofCook-1Cycle12andCycle13GrowthRates100.0%90.0%80.0%I//70.0%60.0%-C4500%C>>400%V300%///200%10.0%0.0%-0.50-0.40-0.30-0.20-0.100.000.100.200.300.400.50VoltageGrowth---Cycle12Cum.%-Cycle13Cum.%AEPDATA.>iLS'EPCyclcl3Chat25-9

'6i0iNDEUNCERTAINTIESNDEuncertaintiesforvoltagemeasuremcntsweredevelopedforCookunitsinWCAP-13187(Ref.4).ThcNDEuncertaintydcvelopcdintheWCAPwasupdatedinReference7,EPRIRcportTR-100407,Revision1(DraftofAugust1993).WhiletheWCAPandEPRIreportsdifferslightlyinthccomponentsofthenetNDEuncertaintyandinthedevclopmcnt,thenctNDEuncertaintyisnotsignificantlydifferent(12%standarddeviationintheWCAPversus12.5%intheEPRIreport)andtheEPRINDEuncertaintyisappliedforbothCycles13and14forCook-l.TheNDEuncertaintyisprincipallyduetoprobewear,whichhasastandarddeviationofapproximately7%aboutameanofzero,andtoanalystvariabilitywhichhasastandarddeviationof10.3%.Thesedistributionsarcappliedasnormaldistributionsandcombined(inasquarerootsum-of-the-squaresmethod)toobtainanetNDEuncertaintyof12.5%foronestandarddeviation.Theupperboundontheprobewearuncertaintyislimitedto15%sincewornbobbinprobesatCook-1arereplaced.Probereplacementoccurswhenthewornprobevoltagemcasuremcntfromtheprobewearstandarddiffersbymorcthan15%fromtheprobewearstandardvoltage.determinedfromtheprobewhenncw.Theeddycurrentanalysisguidelinesrequireleadanalystresolutionofbobbinvoltages(withoncormorereportedabove1.0volt)differingbetweenanalystsbymorethan20%,whichthereforelimitstheupperboundonanalystvariabilityuncertaintyto20%.However,asoftheFebruary8,1994,NRC/Industrymeeting,theNRChadnotacceptedthe20%cutoffontheanalystvariabilityuncertainty.PendingfurtherresolutionofthisissuewiththcNRC,theanalystuncertaintyisappliedwithoutacutofffortheEOCvoltageprojectionsperformedinthisrcport.Inthisreport,EOCvoltageprojectionsaredeterminedusingaprobeweardistributionof7%withacutoffat15%alongwithananalystvariabilityof10.3%withnocutoff.6-1 7.0PROJECTEDEOCVOLTAGEDISTRIBUTIONS7.1ProjcctcdEOC-13VoltageDistributionsConsistentwiththcReference4WCAPmethodology,MonteCarloanalysesareappliedtodevelopprojectedEOCdistributionsfromtheBOCdistributions.ThcBOCvoltagesarcincreasedbyallowancesforNDEuncertainties(fromSection6)andvoltagegrowth(fromSection5)toobtainthcEOCvalues.IntheMonteCarloanalyses,eachvoltagebinoftheBOCvoltagedistributions(Figure4-1forexample)isincrcascdbyarandomsampleoftheNDEuncertaintyandgrowthdistributionstoobtainanEOCvoltagesample.Eachsampleisweightedbythenumberofindicationsinthebin.ThcsamplingprocessisrepeatedforeachBOCvoltagebinandthenrepeatedforalargenumberofsamplesacrossthcBOCdistribution.Intheprcscntanalyses,100,000samplesforeachbinoftheBOCdistributionwereapplied.TheEOCprojectionswereperformedforS/G14whichisthelimitingS/GforbothCycles13and14.TheprojectedEOC-13bobbinvoltagedistributionsareshowninFigures7-laand7-lbandTable7-1forthehvocategoriesofBOCdistributionsdiscussedinSection4.1andshowninFigure4-1.ForthePOD=0.6adjusteddistribution,themaximumprojectedEOC-13voltageis2.4volts.SincetheMonteCarloanalysisyieldsacumulativeprobabilitydistributionofEOCvoltages,amethodmustbedefinedtoobtainadiscretemaximumEOCvoltagevalue.Previously,thetailofthedistributionwasintegratedtoobtainavoltagevaluecorrespondingtooneremainingindication.Toprovideadditionalconservatismintheoverallanalysisandenhancetheestimationofthemaximumvoltage,andbaseduponinformaldiscussionswiththcNRC,theaboveapproachhasbeenmodifiedinthisreport.Inthisrcport,thetailoftheMonteCarlodistributionisintegratedoverthelargest2/3ofanindicationtodefineadiscretevaluewithanoccurrenceof0.7indication,andthetailoverthelargest1/3ofanindicationisintegratedtodefineadiscretevaluewithanoccurrenceof0.3indication.Thus,thelastindicationisdistributedovertwolargervoltagevaluesthanwouldhavebeenpreviouslyused.ForNindicationsinthedistribution,thisisequivalenttoevaluatingthecumulativeprobabilitydistributionofvoltagesatprobabilitiesof(N-0.67)/Nand(N-0.33)/Nversus(N-1)/N.ThelargestvoltagesforalldistributionsdevelopedbyMonteCarlointhisreporthavebeenobtainedwiththeupdateddefinitionofthemaximumEOCdiscretevoltage.ThelargestEOC-13voltageforthedistributionofallindicationswithoutPODadjustment(POD=1.0)is1.9volts.Inthe1992SLBleakrateevaluationforEOC-13usingonlybobbinindications<1.0voltle&inservice,amaximumEOC-13voltageof1.4voltswasreportedforallindicationswithoutPODadjustment.Thedifferencebetween1.4voltsandthe1.9voltsofthisreportisduetothecurrentanalysesincludingRPCNDDindicationsintheanalysisandthcmethod(0.7and0.3ofanindicationinthisreportversusoneindicationintheprioranalysis)usedtodefinethereportedmaximumvoltage.7.2ComparisonofProjectedandActualEOC-13DistributionsIncomparingprojectedandactualdistributions,itisnecessaiytoconsiderthepurposeoftheprojectionsinordertodefinetheappropriateactualdistributions.TheCook-1EOCinspectionresultsincludemanyRPCNDDindications.TheprojectedEOCvoltagedistributionsforIPCapplicationsareappliedtoprojectSLBleakageandtubeburstprobability.AsdiscussedinSection3.3indevelopingtheEOC-13distributionforcomparisonswithprojections,RPCNDDindicationshaveanegligiblelikelihoodofpotentialSLBleakageoverthepriorcycleandshouldbcignoredin7-1

,comparingIPCprojectionswiththeactualdistributions.ThusthecomparisonsofIPCprojectionswithactualdistributionsaremadeforEOC-13RPCconfirmedindicationssummedwithindicationsnotRPCinspectedsinceitcannotbestatedwithconfidencethatthelatterindicationswouldnothaveleakedoverthepriorcycle.ThcappropriateS/G14EOC-13actualdistributionforRPCconfirmedanduntested(notRPCinspected)indicationsforthiscomparisonarcgiveninFigures7-laand7-lbandTable7-1.Thereare133indicationsinthisEOCdistribution.Forcomparison,projectedvoltagedistributionsarealsoprovidedwiththedistributionofall171indicationsforSG-14atEOC-13includingRPCNDDindicationsinFigures7-2aand7-2b.Figures7-laand7-lbshowthecomparisonofprojectedandactualEOC-13voltagedistributions(excludingRPCNDDsasdiscussedabove).Figures7-lashowstheNRCmodel(Figure4-1forBOC-13distributions)whichincludesaPOD=0.6appliedtotheEOC-12inspectionresults.ItisseenthattheNRCmodelleadstosignificantconservatismbothinthenumberofindications(230versusactual133)withleakagepotentialandinthelargestEOCvoltages.TheNRCmodelleadstoprojectedvoltagesashighas2.4voltsandoverestimatesthenumberofindicationsinallvoltagebinsexcept<0.7volt.Fig'ure7-lbshowsthecomparisonfortheprojectionofallindicationswithoutaPODadjustment.Thisprojectionisalsoconservativeabove0.7voltsalthoughlessconservativethantheNRCmodel.TheprojectionbasedonMonteCarloanalyseshasdistributedtheindicationsmorecontinuouslyoverthcvoltagerange,aswouldbeexpected,incomparisontothediscreteactualindicationsandrepresentsaconservativenumberofindicationsabove1.0volts.ThisresultsfromRPCNDDindicationsincludedintheBOCdistributionexceedingthencwRPCconfirmedindications.AcomparisonofprojecteddistributionswiththeEOC-13distributionforallindicationsindependentofRPCconfirmationisshowninFigure7-2aand7-2b.Asnotedabove,thisactualdistributionincludesRPCNDDindicationswhichwouldnotbeexpectedtoleakatEOC-13.Forthiscase,thcNRCmodel(POD=0.6)stillsignificantlyexceedsthedistribution.TheresultsforaPOD=1.0showenhanced,conservativeagreementwiththeactualdistributionabove0.7voltandunderestimatesthenumberofsmallindicationslessthan0.7volt.However,attemptingtoprojectthedistributionforallindicationswouldleadbeoverconservativeifappliedtoSLBleakageanalyses.7.3ProjectedEOC-14VoltageDistributionsTheBOC-14voltagedistributionsaredescribedinSection4.2andFigure4-4.MonteCarlomethodsareappliedconservativelyusingtheCycle12voltagegrowthdistributionofFigure5-1toobtainthcprojectedEOC-14distributions.AsaboveforCycle13,projectionstoEOC-14havebeenmadefortwodistributionsincludingtheNRCmodelwithaPOD=0.6andallbobbinindicationsleftinserviceincludingRPCNDD.Figurc7-3showstheprojectionswithandwithoutthePOD=0.6adjustment.TheconservatismofthcNRCmodel,asrcflectedintheBOCdistributionofFigurc4-2,isseenintheEOC-14distributions.ThcNRCmodelprojectstoanEOCmaximumvoltageofabout2.0voltscomparedto1.9voltsforallindicationsleftinservice.ThecloseagreementbetweenthetwoprojectionsforthemaximumvoltageresultsfromthefactthatnotubeswerepluggedforindicationsattheTSPintersections.ThusthcNRCmodel,whilehavingalargernumberofindicationsleftinservice,docsnotresultinhighervoltageindicationsleftinservicethanthatforallbobbinindicationsleftinservice.7-2 Table7-1.D.C.Cook-1:ActualandProjectedEOC-13DistributionsActualEOC-13DistributionProjectedEOC-13DistributionsVolts0.20.30.40.50.60.70.80.91.01.21.31.41.51.61.71.81.92.02.12.22.32.4TotalsAllInd.23192727171517171RPCConf./Untested2318272715133AllInd,POD=0.620232628312921140.70.3230AllInd.POD=1.0121415171817120.70.3131AEPSIMS.XLSTable7-l7-3

~~Table7-2.D.C.Cook-1:ProjectedEOC-14DistributionsVolts0.20.30.40.50.60.70.80.91.01.21'.3141.51.61.71.81.92.0TotalsAllIndicationsPOD&.62033364037302518130.70.3278AllIndicationsPOD=1.0121921242218140.70.3163AEPSIMS.XLSTable7-2

~'35Figure7-1a.D.C.Cook-1:S/G14ComparisonofProjectedandActualRPCConfirmed/UntestedEOC-.13VoltageDistributionsAllIndications,POD=0.63025ro20'ac~o15oK100.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.4VoltsIlProjectedEOC-130ActualEOC-13-.Figure7-1b.D.C.Cook-1:S/614ComparisonofProjectedandActualRPCConfirmed/UntestedEOC-13VoltageDistributionsAllIndications,POD=1.03025o2015IHo100.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.2Voltsl8ProjectedEOC-130ActualEOC-13'EPSlhls.XLSFigurc7-la7-5 35Figure7-2a.D.C.Cook-1:S/G14ComparisonofProjectedandActualA)lIndicationEOC-13VoltageDistributionsAllIndications,POD=0.63025Og2015O100.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.4Volts;SProjectedEOC-130ActualEOC-13;30Figure7-2b.D.C.Cook-1:S/G14ComparisonofProjectedandActualAllIndicationROC-13VoltageDistributionsAllIndications,POD=1.020CO15CI~100.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.2VoltslmProjectedEOC-130ActualEOC-13'EPSIMS.XLS7-6 Figure7-3.D.C.Cook-I:S/G14ProjectedEOC-14VoltageDistributionsAllindications403530g2520OO15100.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.0Volts0POD=0.60POD=1.0AEPSIMS.XLSFigurc7-37-7

"'.CREFERENCES1.NRCLetter,DocketNo.50-315datedMarch15,1994,"DonaldC.CookNuclearPlant,UnitNo.I-IssuanceofAmendmentRe:Incorporationof2.0VoltSteamGeneratorTubeSupportPlateInterimPluggingCriteriaforCycle14(TACNo.M85971)".2.AEP-94-672,K.F.MatthewstoD.R.Hafer,"AdditionalLeakRateDataforInterimPluggingCriteria",datedApril8,1994.3.NUREG-1477(draft),"Voltage-BasedInterimPluggingCriteriaforSteamGeneratorTubes-TaskGroupRcport,"UnitedStatesNuclearRegulatoryCommission(NRC),JuneI,1993.4.WCAP-13187,"D.C.Cook-1SteamGeneratorTubePluggingCriteriaforIndicationsatTubeSupportPlates,"WestinghouseElectricCorporation,March1992.5.NP-7480-L,VolumeI,RevisionI,"SteamGeneratorTubingOutsideDiameterStressCorrosionCrackingatTubeSupportPlates-DatabaseforAlternateRepairLimits,VolumeI:7/8InchDiameterTubing,"ElectricPowerResearchInstitute,December,1993.6.EPRILetter,"ExclusionofDatafromAlternateRepairCriteria(ARC)DatabasesAssociatedwith7/8inchTubingExhibitingODSCC,"D.A.Steininger(EPRI)toJ.Strosnidcr(USNRC),April22,1994[tobecomeAppendixEofreference(2)].7.TR-100407,RevisionI(draft),"PWRStcamGeneratorTubeRepairLimits-TechnicalSupportDocumentforOutsideDiameterStressCorrosionCrackatTubeSupportPlates,"ElectricPowerResearchInstitute,August1993.8-1 Aags~gi*,