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{{#Wiki_filter:ACCELERATlDOCUMENTDISTRIBUTIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9404280277DOC.DATE:94/04/22NOTARIZED:NOFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterGAUTH.NAMEAUTHORAFFILIATIONMARTIN,J.T.RochesterGas&ElectricCorp.MECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONDOCKETg05000244RtDP/DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRENCLSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),ncident,Rpt,etc.NOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).05000244D
{{#Wiki_filter:ACCELERATl DOCUMENTDISTRIBUTION SYSTEMREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9404280277 DOC.DATE:
94/04/22NOTARIZED:
NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION MARTIN,J.T.
Rochester Gas&ElectricCorp.MECREDY,R.C.
Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION DOCKETg05000244RtDP/DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTR ENCLSIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),ncident,Rpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).
05000244D


==SUBJECT:==
==SUBJECT:==
LER94-006-00:on940323,both"A"&"B"steamWestinghouseSeries44steamgenerators,requiredcorrectiveactionduetotubedegradation.CausewasPWS.Correctiveaction:tubeswerereaired.W940422ltr.RECIPIENTIDCODE/NAMEPD1-3PDINTERNAL:AEOD/DOAAEOD/ROAB/DSPNRR/DE/EMEBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRSS/PRPBNRR/DSSA/SRXBRES/DSIR/EIBEXTERNAL:EG&GBRYCE,J.HNRCPDRNSICPOOREiWCOPIESLTTRENCL111122111111221111221111RECIPIENTIDCODE/NAMEJOHNSON,AAEOD/DSP/TPABNRR/DE/EELBNRR/DORS/OEABNRR/DRCH/HICBNRR/DRIL/RPEBN./DSSAQSPLBG~~~02RGN1FILE01LSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL111111111111111111111111DDDNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTEICONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR27ENCL27D ITlrlrlr'PIISI1'lR,'I',"IIC~~~4~~IIr'oarsscarcROCHFSTERGASANDELECTRICCORPORATION489EASTAVENUE,ROCHESTERN.K14649-0001ROBERTCMECREDYVicePresideniCinnaNuclearProducrionTELEPHONEAREACOOEi165462700April22,1994U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:AllenR.JohnsonProjectDirectorateI-3Washington,D.C.20555
LER94-006-00:on 940323,both "A"&"B"steamWestinghouse Series44steamgenerators, requiredcorrective actionduetotubedegradation.
CausewasPWS.Corrective action:tubeswerereaired.W940422ltr.RECIPIENT IDCODE/NAME PD1-3PDINTERNAL:
AEOD/DOAAEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB EXTERNAL:
EG&GBRYCE,J.H NRCPDRNSICPOOREiWCOPIESLTTRENCL111122111111221111221111RECIPIENT IDCODE/NAME JOHNSON,A AEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB N./DSSAQSPLB G~~~02RGN1FILE01LSTLOBBYWARDNSICMURPHY,G.A NUDOCSFULLTXTCOPIESLTTRENCL111111111111111111111111DDDNOTETOALL"RIDS"RECIPIENTS:
PLEASEHELPUSTOREDUCEWASTEICONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)
TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:
LTTR27ENCL27D ITlrlrlr'PIISI 1'lR,'I',"
IIC~~~4~~IIr'oarsscarcROCHFSTER GASANDELECTRICCORPORATION 489EASTAVENUE,ROCHESTER N.K14649-0001 ROBERTCMECREDYVicePresideni CinnaNuclearProducrion TELEPHONE AREACOOEi165462700April22,1994U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate I-3Washington, D.C.20555


==Subject:==
==Subject:==
LER94-006,SteamGeneratorTubeDegradationDuetoIGA/SCC,CausesQualityAssuranceManualReportableLimitstobeReachedR.E.GinnaNuclearPowerPlantDocketNo.50-244IInaccordancewith10CFR50.73,Licensee.EventReportSystem,item(Other),andtheGinnaStationQualityAssuranceManualAppendixB,whichrequiresthat,"Ifthenumberoftubesinageneratorfallingintocategories(a)or(b)belowexceedsthecriteria,thenresultsoftheinspectionshallbeconsideredaReportableEventpursuantto10CFR50,73,"theattachedLicenseeEventReportLER94-006isherebysubmitted.Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytlyyours,RobertC.MecredyXC:U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector9404280277500024+qe0422PDRADOCK0PDP8/7 NRCFORM3665-92)U.SNUCLEARREGULATORYCQIIISSIONAPPROVEDBY(IHINO.3150-0104EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednunberofdigits/charactersforeachblock)ESTIMATEDBURDENPERRESPONSETOCOMPLY'WITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEIHFORMATIONANDRECORDSMANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION/WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140.0104),OFFICEOFHANAGEMENTANDBUDGETWASHINGTONDC20503.FAGILITYNAIK(1)R.E~GinnaNuclearPowerPlantIDOCKETNQQIER(2)05000244PAGE(3)1OF8TITLE(6)SteamGeneratorTubeDegradationDuetoIGA/SCC,CausesQualityAssuranceManualReportableLimitstobeReachedEVENTDATE5LERNWBER6REPORTDATE7OTHERFACILITIESINVOLVED0HONTH03DAYYEAR2394YEAR94SEQUENTIALHUMBER--006--REVISIONNUMBER00MONTH04DAYYEAR2294FACILITYNAMEFACILITYNAMEDOCKETNUMBERDOCKETNUMBERGRATINGNX)E(9)RRKRLEVEL(10)N000THISREPORTISSUBMITTEDPURSUANT20.402(b)20'05(a)(1)(i)20.405(a)(1)(ii)20.405(a)(1)(iii)20.405(a)(1)(iv)20.405(a)(1)(v)20.405(c)50.36(c)(1)50'6(c)(2)50.73(a)(2)(i)50.73(a)(2)(ii)50.73(a)(2)(iii)50'3(a)(2)(iv)50.73(a)(2)(v)50'3(a)(2)(vii)50.73(a)(2)(viii)(A)50.73(a)(2)(viii)(B)50.73(a)(2)(x)73.71(b)73.71(c)OTHER(SpecifyinAbstractbelowandinText,HRCForm366ATOTHEREQUIREMENTSOF10CFR:Checkoneormore11LICENSEECONTACTFORTHISLER12NAMEJohnT.St.Martin.Director,OperatingExperienceTELEPHONENUMBER(IncludeAreaCode)(315)524-4446C(NPLETEONELINEFOREACHC(NPOHENTFAILUREDESCRIBEDINTHISREPORT13CAUSESYSTEMBABCOMPONENTTBGMANUFACTURERH314REPORTABLETOHPRDSCAUSESYSTEMCOMPONENTMANUFACTURERREPORTABLETOHPRDSSUPPLEMENTALREPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBMISSIOHDATE).XNOEXPECTEDSUBMISSIONDATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately15single-spacedtypewrittenlines),(16)Duringthe1994AnnualRefuelingandMaintenanceOutage,subsequenttotheeddycurrentexaminationperformedonboththe"A"and"B"WestinghouseSeries44steamgenerators,164tubesinthe"A"steamgeneratorand134tubesinthe"B"steamgeneratorrequiredcorrectiveactionduetotubedegradation.Theimmediatecauseoftheeventwasthatthe"A"and"B"steamgeneratortubedegradationwasinexcessoftheGinnaStationQualityAssuranceManualreportablelimits.TheunderlyingcauseofthetubedegradationisacommonsteamgeneratorproblemofapartiallyrolledtubesheetcrevicewithrecurringIntergranularAttack/StressCorrosionCracking(IGA/SCC)andPrimaryWaterStressCorrosionCracking(PWSCC)attackonsteamgeneratortubing.ThiseventisNRCPerformanceIndicatorSystemCauseCode5.8.4.3andNUREG-1022CauseCode(B).Correctiveactiontakenwastoeithersleeveorplugtheaffectedtubeswithacceptedindustryrepairmethods.HRCFORM366(5.92)
LER94-006,SteamGenerator TubeDegradation DuetoIGA/SCC,CausesQualityAssurance ManualReportable LimitstobeReachedR.E.GinnaNuclearPowerPlantDocketNo.50-244IInaccordance with10CFR50.73,Licensee.
HRCFORH366A(5-92)US.NUCLEARREGULATORYC(NIIISSIOHL'ICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBY(NIBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPOHSETOCOHPLYWITHTHISIHFORHATIOHCOLLECTIONREQUEST:50.0HRS.FORWARDCOHHENTSREGARDINGBURDENESTIHATETOTHEINFORMATIONANDRECORDSHANAGEHEHTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOHHISSION,WASHINGTON,DC20555-0001,ANDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFHANAGEHENTANDBUDGETWASHINGTONDC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETNNBER2YEAR0500024494LERNNBER6SEQUEHTIAL--006--REVISION00PAGE32OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)PRE-EVENTPLANTCONDITIONSiTheplantwasinthecold/refuelingshutdownconditionforthe1994AnnualRefuelingandMaintenanceOutage.TheReactorCoolantSystem(RCS)wasdepressurizedandRCStemperaturewasapproximately66degreesF.SteamGenerator(S/G)eddycurrentexaminationwasinprogress.II.DESCRIPTIONOFEVENTA.DATESANDAPPROXIMATETIMESOFMAJOROCCURRENCES:March23,1994,1500EST:ThenumberofdegradedS/GtubeswasknowntoexceedGinnaStationQualityAssurance(QA)Manualreportablelimits,basedoncompletionof"A>>and"B"S/Ghotlegand"A"S/Gcoldleginspectionprogram.Event.dateandtime.fMarch23,1994,1500EST:Discoverydateandtime.March24,1994,1300EST:OralnotificationmadetotheNRCOfficeofNuclearReactorRegulation(NRR)thatthenumberofdegradedS/GtubesexceededQAManualreportablelimits.March26,1994,1800EST:Alleddycurrentprogramscompleted,andtheevaluationofthe1994inserviceinspectionofS/Gtubescompleted.March27,1994,2235EST:S/Grepairscompleted.April8,1994:ASpecialReportwassenttotheUSNRC,reportingthenumberoftubespluggedorsleevedineachS/G.HRCFORH366A(5-92)
EventReportSystem,item(Other),andtheGinnaStationQualityAssurance ManualAppendixB,whichrequiresthat,"Ifthenumberoftubesinagenerator fallingintocategories (a)or(b)belowexceedsthecriteria, thenresultsoftheinspection shallbeconsidered aReportable Eventpursuantto10CFR50,73,"theattachedLicenseeEventReportLER94-006isherebysubmitted.
NRCFORH366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBY(NBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPONSETOCOHPLYWITHTHISIHFORHATIOHCOLLECTIONREQUEST:50.0HRS.FORllARDCONHEHTSREGARDINGBURDENESTIHATETOTHEIHFORNATIOHANDRECORDSHANAGEHEHTBRANCH(HHBB7714),U.S.NUCLEARREGULATORYCOHNISSIOH,UASHIHGTOH,DC20555-0001ANDTOTHEPAPERIIORKREDUCTIONPROJECT(3140-0104),OFFICEOFHANAGEHENTANDBUDGETllASHIHGTONDC20503.FACILITYNANE1R.E.GinnaNuclearPowerPlantDOCKETIRNBER205000244LERNINBER6YEARSEQUENTIAL94--006--REVISION00PAGE33OF8TEXl'Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)B.EVENT:Duringthe1994AnnualRefuelingandMaintenanceOutage,aneddycurrentexaminationwasperformedinboththe>>A>>(EMSOlA)and>>B>>(EMSOlB)WestinghouseSeries44designrecirculatingsteamgenerators.Thepurposeoftheeddycurrentexaminationwastoassessanycorrosionormechanicaldamagethatmayhaveoccurredduringthecyclesincethe1993examination.TheexaminationwasperformedbypersonnelfromRochesterGasandElectric(RG&E)andABBCombustionEngineering.All-personnelweretrainedandqualifiedintheeddycurrentexaminationmethod.andhavebeencertifiedtoaminimumofLevelIfordataacquisitionandLevelIIfordataanalysis.Theinitialeddycurrentexaminationsofthe>>A>>and>>B>>S/GswereperformedutilizingastandardbobbincoiltechniquewithdataacquisitionbeingperformedwiththeEDDYNETAcquisitionSystem.Thefrequenciesselectedwere400,200,100,and25KHz.Additionaleddycurrentexaminationsofthe>>A>>and>>B>>S/GswereperformedutilizingtheZetec3-coilMotorizedRotatingPancakeCoil(MRPC)probetoexaminetherolltransitionregion,selectedcrevicesandsupportplates.Thefrequenciesusedfortheseexaminationswere400,300,100,and25KHz.I,Theinletorhotlegexaminationprogramplanwasgeneratedtoprovidetheexaminationof100%ofeachopenunsleevedS/Gtubefromthetubeendthroughthefirsttubesupportplate,alongwith20%ofthesetubesbeingselectedandexaminedfortheirfulllength(204randomsampleasrecommendedintheElectricPowerResearchInstitute.(EPRI)guidelines]withthebobbincoil.Inaddition,204ofeachtypeofsleevewasexaminedandtheremainingtubewasexaminedfulllength.AllRow1andRow2U-BendregionswereexaminedwiththeMRPCbetweentheg6tubesupportplatehotsideandtheg6tubesupportplatecoldsidefromthecoldlegside.HRCFORH366A(5.92)
Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytlyyours,RobertC.MecredyXC:U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaSeniorResidentInspector 9404280277 500024+qe0422PDRADOCK0PDP8/7 NRCFORM3665-92)U.SNUCLEARREGULATORY CQIIISSIONAPPROVEDBY(IHINO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednunberofdigits/characters foreachblock)ESTIMATED BURDENPERRESPONSETOCOMPLY'WITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEIHFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION/
NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDSYQ(BNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRAHCH(MHBB7714),U.STNUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAJK1R.E.GinnaNuclearPowerPlantDOCKETlRNBER205000244YEAR94LERNINBER6SEQUENTIALREVISIONM-006--00PAGE34OF8EXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)Resultsoftheaboveexaminationsindicatedthat164tubesinthe>>A>>S/Grequiredrepair(21newrepairsbypluggingand143newrepairsbysleeving).134tubesinthe>>B>>S/Grequiredrepair(31newrepairsbypluggingand103newrepairsbysleeving).Correctiveactionswerethereforetakenfor164tubesinthe>>A>>S/G,andfor134tubesinthe>>B>>S/G.OnMarch26,1994,atapproximately1800EST,withtheRCSdepressurizedandtemperatureatapproximately66degreesF,finalreviewofthe1994S/Geddycurrentexaminationresultswascompleted.Priortocompletionofthisreview(onMarch23,1994,atapproximately1500EST),itwasevidentthatmorethanonepercentofthetotaltubesinspectedweredegraded(i.e.,imperfectionsgreaterthantherepairlimit).Becauseoftheabove,theresultsoftheinspectionareconsideredareportableeventpursuantto10CFR50.73perAppendixBoftheQAManual.OnMarch24,1994,atapproximately1300EST,oralnotificationwasmadetotheNRCOfficeofNuclearReactorRegulationpursuanttoAppendixBoftheQAManual.OnApril8,1994,aSpecialReportlistingthenumberoftubesrequiredtobepluggedorsleevedineachS/G,wasreportedtotheNRC,pursuanttoAppendixBoftheQAManual.C~INOPERABLESTRUCTURESiCOMPONENTSIORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:NoneE.METHODOFDISCOVERY:Thiseventwasapparentduringthereviewofthe>>A>>and>>B>>S/Geddycurrentexaminationresults.NRCFORM366A(5-92)
WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140.0104),
NRCFORM366A(5-92)U.S.NUCLEARREGULATORYC(IIIISSI(NILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYIGNINO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRAHCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140.0104),OFFICEOF.MANAGEMENTAHDBUDGETWASHIHGTOHDC20503.FACILITYNAME1DOCKETNEER2R.E.GinnaNuclearPowerPlantp5ppp244LERNIMBER6YEARSEQUENTIAL94--006--REVISION00PAGE35OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)F.OPERATORACTION:TheControlRoomoperatorswerenotifiedthatthenumberofdegradedtubesexceededthereportablelimitsoftheQAManual,andthattheNRC(NRR)hadalreadybeennotifiedbycorporatestaff.TheControlRoomoperatorscompletedthenotificationsandevaluationsrequiredbytheA-25.1(GinnaStationEventReport),submittedfortheeventbytheS/Gexaminationandrepairsupervision.G.SAFETYSYSTEMRESPONSES:NoneIII.CAUSEOFEVENTA.IMMEDIATECAUSE:Theimmediatecauseoftheeventwasthe"A"and"B"S/GtubedegradationwasinexcessoftheQAManualreportablelimits.B.ROOTCAUSE:TheresultsoftheexaminationindicatethatIntergranularAttack(IGA)andIntergranularStressCorrosionCracking(IGSCCorSCC)continuetobeactivewithinthetubesheetcreviceregionontheinletsideofeachS/G.Asinthepast,IGA/SCCismuchmoreprevalentinthe"B"S/Gwith74newcreviceindicationsreportedin1994.Inthe"A"S/G,42newcreviceindicationswerereportedin1994.In1993,41newcreviceindicationswerereportedinthe"A"S/G,and103newcreviceindicationswerereportedinthe>>B"S/G.In1994,42newcreviceindicationswerereportedinthe"A"S/G,and74newcreviceindicationswerereportedinthe"B"S/G.Comparisonof1993and1994resultsdoesnotsuggestanysignificantchangeintherateoftubedegradationduetoIGA/SCC.HRCFORM366A(5-92)
OFFICEOFHANAGEMENT ANDBUDGETWASHINGTON DC20503.FAGILITYNAIK(1)R.E~GinnaNuclearPowerPlantIDOCKETNQQIER(2)05000244PAGE(3)1OF8TITLE(6)SteamGenerator TubeDegradation DuetoIGA/SCC,CausesQualityAssurance ManualReportable LimitstobeReachedEVENTDATE5LERNWBER6REPORTDATE7OTHERFACILITIES INVOLVED0HONTH03DAYYEAR2394YEAR94SEQUENTIAL HUMBER--006--REVISIONNUMBER00MONTH04DAYYEAR2294FACILITYNAMEFACILITYNAMEDOCKETNUMBERDOCKETNUMBERGRATINGNX)E(9)RRKRLEVEL(10)N000THISREPORTISSUBMITTED PURSUANT20.402(b) 20'05(a)(1)(i)20.405(a)(1)(ii) 20.405(a)(1)(iii) 20.405(a)(1)(iv) 20.405(a)(1)(v) 20.405(c) 50.36(c)(1) 50'6(c)(2)50.73(a)(2)(i) 50.73(a)(2)(ii) 50.73(a)(2)(iii) 50'3(a)(2)(iv) 50.73(a)(2)(v) 50'3(a)(2)(vii) 50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(x) 73.71(b)73.71(c)OTHER(SpecifyinAbstractbelowandinText,HRCForm366ATOTHEREQUIREMENTS OF10CFR:Checkoneormore11LICENSEECONTACTFORTHISLER12NAMEJohnT.St.Martin.Director, Operating Experience TELEPHONE NUMBER(IncludeAreaCode)(315)524-4446C(NPLETEONELINEFOREACHC(NPOHENT FAILUREDESCRIBED INTHISREPORT13CAUSESYSTEMBABCOMPONENT TBGMANUFACTURER H314REPORTABLE TOHPRDSCAUSESYSTEMCOMPONENT MANUFACTURER REPORTABLE TOHPRDSSUPPLEMENTAL REPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBMISSIOH DATE).XNOEXPECTEDSUBMISSION DATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten lines),(16)Duringthe1994AnnualRefueling andMaintenance Outage,subsequent totheeddycurrentexamination performed onboththe"A"and"B"Westinghouse Series44steamgenerators, 164tubesinthe"A"steamgenerator and134tubesinthe"B"steamgenerator requiredcorrective actionduetotubedegradation.
HRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQHISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYWNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYllITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORNARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMAHAGEMEHTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,MASHIHGTOH,DC20555-0001AHDTOTHEPAPERNORKREDUCTIONPROJECT(31400104),OFFICEOFMANAGEHEHTANDBUDGETl!ASHIHGTONDC20503.FACILITYIUNE1R.E.GinnaNuclearPowerPlantDOCKETHINBER205000244YEARLERIWIER6SEQUENTIAL--006--REVISION00PAGE36OF8TEXT(IfmorespeceisreqUIred,useedditionelcopiesofHRCForm366A)(17)ThemajorityoftheinlettubesheetcrevicecorrosionindicationsareIGA/SCCoftheMillAnnealedInconel600tubematerial.Thisformofcorrosionisbelievedtobetheresultofanalkalineenvironmentforminginthetubesheetcrevices.Thisenvironmenthasdevelopedovertheyearsasdepositsandactivespecies,suchassodiumandphosphate,havereacted,changinganeutralorinhibitedcreviceenvironmentintotheaggressiveenvironmentthatpresentlyexists.AlongwithIGA/SCCinthecrevices,PrimaryWaterStressCorrosionCracking(PWSCC)attherolltransitioncontinuedtobeactiveduringthelastoperatingcycle.Thismechanismwasfirstaddressedin1989,andthisyeartherewere120rolltransition(PWSCC)indicationsinthe"A"S/Gand66rolltransition(PWSCC)indicationsinthe"B"S/G..ThesenumbersincludetubesthatmayhavePWSCCincombinationwithIGAorSCCinthecrevice.ThiseventisNRCPerformanceIndicatorSystemCauseCode5.8.4.3,"MaintenanceEquipmentFailure",andNUREG-1022CauseCode(B),"Design,Manufacturing,Construction/Installation."IV.ANALYSISOFEVENTThiseventisreportableinaccordancewith10CFR.50.73,LicenseeEventReportSystem,item(Other)andtheQAManualAppendixBwhichrequiresthat,"Ifthenumberoftubesinageneratorfallingintocategories(a)or(b)belowexceedsthecriteria,thenresultsoftheinspectionshallbeconsideredaReportableEventpursuantto10CFR50.73."Thetubedegradationinthe"A"and"B"S/Gsexceededthecriterionof(b)whichstates,"Morethan1percentofthetotaltubesinspectedaredegraded(imperfectionsgreaterthantherepairlimit)".Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthiseventwiththe'followingresultsandconclusions:TherewerenooperationalorsafetyconsequencesresultingfromtheS/GtubedegradationinexcessoftheQAManualreportablelimitsbecause:HRCFORM366A(5-92)
Theimmediate causeoftheeventwasthatthe"A"and"B"steamgenerator tubedegradation wasinexcessoftheGinnaStationQualityAssurance Manualreportable limits.Theunderlying causeofthetubedegradation isacommonsteamgenerator problemofapartially rolledtubesheetcrevicewithrecurring Intergranular Attack/Stress Corrosion Cracking(IGA/SCC) andPrimaryWaterStressCorrosion Cracking(PWSCC)attackonsteamgenerator tubing.ThiseventisNRCPerformance Indicator SystemCauseCode5.8.4.3andNUREG-1022 CauseCode(B).Corrective actiontakenwastoeithersleeveorplugtheaffectedtubeswithacceptedindustryrepairmethods.HRCFORM366(5.92)
Ci NRCFORH366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYQISNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOHHENTSREGARDINGBURDENESTIHATETOTHEINFORNATIONANDRECORDSHANAGEKEHTBRANCH(HHBB7714),U.S.NUCLEARREGULATORYCOHHISSION,WASHINGTON,DC20555-0001AND'O"THEPAPERWORKREDUCTIONPROJECT(3110-0104),OFFICEOFNANAGEHENTANDBUDGETWASHINGTONDC20503.FACILITYNANE1R.E.GinnaNuclearPowerPlantDOCKETNWBER205000244YEAR94--006--00LERNNNIER6SEQUENTIALREVISIONPAGE37OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)~ThedegradedtubeswereidentifiedandrepairedpriortoanysignificantleakageorS/Gtuberuptureoccurring.~EvenassumingacompleteseveranceofaS/Gtubeatfullpower,asstatedintheR.E.GinnaNuclearPowerPlantUpdatedFinalSafetyAnalysisReport(GinnaUFSAR)section15.6.3(SteamGeneratorTubeRupture),thesequenceofrecoveryactionsensuresearlyterminationofprimarytosecondaryleakagewithorwithoutoffsitepoweravailablethuslimitingoffsiteradiationdosestowithintheguidelinesof10CFR100.Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassured'atalltimes.V.CORRECTIVEACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENTNORMALSTATUSOfthe164tubesrepairedinthe"A"S/G,143tubeswererepairedusinga203/4inchBabcockandWilcoxkineticallyweldedtubesheetsleeveinthehotleg.Allofthese143tubeswillremaininservice.Theremaining21tubeswereremovedfromservicebypluggingboththehotandcoldlegtubeends.Atotalof215tubesinthe"A"S/Garecurrentlypluggedand811tubesaresleeved.Ofthe134tubesrepairedinthe"B"S/G,103tubeswererepairedusinga203/4inchBabcockandWilcoxkineticallyweldedtubesheetsleeveinthehotleg.Allofthese103tubeswillremaininservice.30tubeswereremovedfromservicebypluggingboththehotandcoldlegtubeends.Theremainingtubewaspreviouslypluggedandexhibitedacrackindicationintheplug.Thesubjecttubeplugwasremovedandanewpluginstalled.Atotalof315tubesinthe"B"S/Garecurrentlypluggedand1390tubesaresleeved.Alltheaboverepairsonthe"A"and"B"S/GswerecompletedonMarch27,1994,atapproximately2235EST.HRCFORH366A(5-92)
HRCFORH366A(5-92)US.NUCLEARREGULATORY C(NIIISSIOH L'ICENSEE EVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(NIBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPOHSETOCOHPLYWITHTHISIHFORHATIOH COLLECTION REQUEST:50.0HRS.FORWARDCOHHENTSREGARDING BURDENESTIHATETOTHEINFORMATION ANDRECORDSHANAGEHEHT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001, ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),
HRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIOHZiICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYQQINO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONAMDRECORDSMANAGEMENTBRANCH(HNBB771C),U.S.NUCLEARREGULATORYCONHISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGET'WASHINGTOMDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantMxxETHIM(BER205000244YEAR94-006--00LERNWBER6SEQUENTIALREVISIONPAGE38OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE-Theoccurrence/presenceofIGA,SCC,andPWSCCisaPWRS/Gproblem.UtilitieswithsusceptibletubingandpartiallyrolledcrevicesmustdealwiththisrecurringattackonS/Gtubing.R.E.GinnaNuclearPowerPlantwillcontinuecarefulmonitoringofbothprimaryRCSandsecondarysidewaterchemistryparameters.Thesewaterchemistryparameterswillcontinuetobeevaluated'againstacceptedindustryguidelinesinordertominimizeharmfulprimaryand/orsecondarysideenvironments.DegradedS/Gtubesshallbesleevedorpluggedinaccordancewiththeinserviceinspectionprogramandacceptedindustryrepairmethods.\VI.ADDITIONALINFORMATIONA.FAILEDCOMPONENTS:ThedegradedcomponentsareInconel600MillAnnealedU-Bendtubeshavinganoutside.diameterof0.875inchesandanominalwallthicknessof0.050inches.ThetubesweremanufacturedbyHuntingtonAlloyCompany.B.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistoricalsearchwasconductedwiththefollowingresults:ThecreviceindicationsaresimilartothosereportedinA0-74-02,AO-75-07,R0-75-013,andLERs76-008,77008'8003I79006'9022I80003g81009g82003I8202283-013,89-001,90-004,91-005,92-005,and93-002.C.SPECIALCOMMENTS:Amorein-depthfinalreportwillbesubmittedtotheNRC,asrequiredbytheGinnaQAManual.Asanoteofinterest,RG&EhasorderednewsteamgeneratorsforR.E.GinnaNuclearPowerPlanttobeinstalledin1996.HRCFORH366A(592)
OFFICEOFHANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETNNBER2YEAR0500024494LERNNBER6SEQUEHTIAL
--006--REVISION00PAGE32OF8TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)PRE-EVENT PLANTCONDITIONS iTheplantwasinthecold/refueling shutdowncondition forthe1994AnnualRefueling andMaintenance Outage.TheReactorCoolantSystem(RCS)wasdepressurized andRCStemperature wasapproximately 66degreesF.SteamGenerator (S/G)eddycurrentexamination wasinprogress.
II.DESCRIPTION OFEVENTA.DATESANDAPPROXIMATE TIMESOFMAJOROCCURRENCES:
March23,1994,1500EST:ThenumberofdegradedS/GtubeswasknowntoexceedGinnaStationQualityAssurance (QA)Manualreportable limits,basedoncompletion of"A>>and"B"S/Ghotlegand"A"S/Gcoldleginspection program.Event.dateandtime.fMarch23,1994,1500EST:Discovery dateandtime.March24,1994,1300EST:Oralnotification madetotheNRCOfficeofNuclearReactorRegulation (NRR)thatthenumberofdegradedS/GtubesexceededQAManualreportable limits.March26,1994,1800EST:Alleddycurrentprogramscompleted, andtheevaluation ofthe1994inservice inspection ofS/Gtubescompleted.
March27,1994,2235EST:S/Grepairscompleted.
April8,1994:ASpecialReportwassenttotheUSNRC,reporting thenumberoftubespluggedorsleevedineachS/G.HRCFORH366A(5-92)
NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(NBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISIHFORHATIOH COLLECTION REQUEST:50.0HRS.FORllARDCONHEHTSREGARDING BURDENESTIHATETOTHEIHFORNATIOH ANDRECORDSHANAGEHEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COHNISSIOH, UASHIHGTOH, DC20555-0001 ANDTOTHEPAPERIIORK REDUCTION PROJECT(3140-0104),
OFFICEOFHANAGEHENT ANDBUDGETllASHIHGTON DC20503.FACILITYNANE1R.E.GinnaNuclearPowerPlantDOCKETIRNBER205000244LERNINBER6YEARSEQUENTIAL 94--006--REVISION00PAGE33OF8TEXl'Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)B.EVENT:Duringthe1994AnnualRefueling andMaintenance Outage,aneddycurrentexamination wasperformed inboththe>>A>>(EMSOlA)and>>B>>(EMSOlB)Westinghouse Series44designrecirculating steamgenerators.
Thepurposeoftheeddycurrentexamination wastoassessanycorrosion ormechanical damagethatmayhaveoccurredduringthecyclesincethe1993examination.
Theexamination wasperformed bypersonnel fromRochester GasandElectric(RG&E)andABBCombustion Engineering.
All-personnel weretrainedandqualified intheeddycurrentexamination method.andhavebeencertified toaminimumofLevelIfordataacquisition andLevelIIfordataanalysis.
Theinitialeddycurrentexaminations ofthe>>A>>and>>B>>S/Gswereperformed utilizing astandardbobbincoiltechnique withdataacquisition beingperformed withtheEDDYNETAcquisition System.Thefrequencies selectedwere400,200,100,and25KHz.Additional eddycurrentexaminations ofthe>>A>>and>>B>>S/Gswereperformed utilizing theZetec3-coilMotorized RotatingPancakeCoil(MRPC)probetoexaminetherolltransition region,selectedcrevicesandsupportplates.Thefrequencies usedfortheseexaminations were400,300,100,and25KHz.I,Theinletorhotlegexamination programplanwasgenerated toprovidetheexamination of100%ofeachopenunsleeved S/Gtubefromthetubeendthroughthefirsttubesupportplate,alongwith20%ofthesetubesbeingselectedandexaminedfortheirfulllength(204randomsampleasrecommended intheElectricPowerResearchInstitute
.(EPRI)guidelines]
withthebobbincoil.Inaddition, 204ofeachtypeofsleevewasexaminedandtheremaining tubewasexaminedfulllength.AllRow1andRow2U-BendregionswereexaminedwiththeMRPCbetweentheg6tubesupportplatehotsideandtheg6tubesupportplatecoldsidefromthecoldlegside.HRCFORH366A(5.92)
NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDSYQ(BNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRAHCH(MHBB7714),U.STNUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAJK1R.E.GinnaNuclearPowerPlantDOCKETlRNBER205000244YEAR94LERNINBER6SEQUENTIALREVISIONM-006--00PAGE34OF8EXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)Resultsoftheaboveexaminations indicated that164tubesinthe>>A>>S/Grequiredrepair(21newrepairsbypluggingand143newrepairsbysleeving).
134tubesinthe>>B>>S/Grequiredrepair(31newrepairsbypluggingand103newrepairsbysleeving).
Corrective actionsweretherefore takenfor164tubesinthe>>A>>S/G,andfor134tubesinthe>>B>>S/G.OnMarch26,1994,atapproximately 1800EST,withtheRCSdepressurized andtemperature atapproximately 66degreesF,finalreviewofthe1994S/Geddycurrentexamination resultswascompleted.
Priortocompletion ofthisreview(onMarch23,1994,atapproximately 1500EST),itwasevidentthatmorethanonepercentofthetotaltubesinspected weredegraded(i.e.,imperfections greaterthantherepairlimit).Becauseoftheabove,theresultsoftheinspection areconsidered areportable eventpursuantto10CFR50.73perAppendixBoftheQAManual.OnMarch24,1994,atapproximately 1300EST,oralnotification wasmadetotheNRCOfficeofNuclearReactorRegulation pursuanttoAppendixBoftheQAManual.OnApril8,1994,aSpecialReportlistingthenumberoftubesrequiredtobepluggedorsleevedineachS/G,wasreportedtotheNRC,pursuanttoAppendixBoftheQAManual.C~INOPERABLE STRUCTURES iCOMPONENTS IORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARY FUNCTIONS AFFECTED:
NoneE.METHODOFDISCOVERY:
Thiseventwasapparentduringthereviewofthe>>A>>and>>B>>S/Geddycurrentexamination results.NRCFORM366A(5-92)
NRCFORM366A(5-92)U.S.NUCLEARREGULATORY C(IIIISSI(NI LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYIGNINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRAHCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140.0104),
OFFICEOF.MANAGEMENT AHDBUDGETWASHIHGTOH DC20503.FACILITYNAME1DOCKETNEER2R.E.GinnaNuclearPowerPlantp5ppp244LERNIMBER6YEARSEQUENTIAL 94--006--REVISION00PAGE35OF8TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)F.OPERATORACTION:TheControlRoomoperators werenotifiedthatthenumberofdegradedtubesexceededthereportable limitsoftheQAManual,andthattheNRC(NRR)hadalreadybeennotifiedbycorporate staff.TheControlRoomoperators completed thenotifications andevaluations requiredbytheA-25.1(GinnaStationEventReport),submitted fortheeventbytheS/Gexamination andrepairsupervision.
G.SAFETYSYSTEMRESPONSES:
NoneIII.CAUSEOFEVENTA.IMMEDIATE CAUSE:Theimmediate causeoftheeventwasthe"A"and"B"S/Gtubedegradation wasinexcessoftheQAManualreportable limits.B.ROOTCAUSE:Theresultsoftheexamination indicatethatIntergranular Attack(IGA)andIntergranular StressCorrosion Cracking(IGSCCorSCC)continuetobeactivewithinthetubesheet creviceregionontheinletsideofeachS/G.Asinthepast,IGA/SCCismuchmoreprevalent inthe"B"S/Gwith74newcreviceindications reportedin1994.Inthe"A"S/G,42newcreviceindications werereportedin1994.In1993,41newcreviceindications werereportedinthe"A"S/G,and103newcreviceindications werereportedinthe>>B"S/G.In1994,42newcreviceindications werereportedinthe"A"S/G,and74newcreviceindications werereportedinthe"B"S/G.Comparison of1993and1994resultsdoesnotsuggestanysignificant changeintherateoftubedegradation duetoIGA/SCC.HRCFORM366A(5-92)
HRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQHISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYWNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYllITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORNARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMAHAGEMEHT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, MASHIHGTOH, DC20555-0001 AHDTOTHEPAPERNORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEHEHT ANDBUDGETl!ASHIHGTON DC20503.FACILITYIUNE1R.E.GinnaNuclearPowerPlantDOCKETHINBER205000244YEARLERIWIER6SEQUENTIAL
--006--REVISION00PAGE36OF8TEXT(IfmorespeceisreqUIred, useedditionel copiesofHRCForm366A)(17)Themajorityoftheinlettubesheet crevicecorrosion indications areIGA/SCCoftheMillAnnealedInconel600tubematerial.
Thisformofcorrosion isbelievedtobetheresultofanalkalineenvironment forminginthetubesheet crevices.
Thisenvironment hasdeveloped overtheyearsasdepositsandactivespecies,suchassodiumandphosphate, havereacted,changinganeutralorinhibited creviceenvironment intotheaggressive environment thatpresently exists.AlongwithIGA/SCCinthecrevices, PrimaryWaterStressCorrosion Cracking(PWSCC)attherolltransition continued tobeactiveduringthelastoperating cycle.Thismechanism wasfirstaddressed in1989,andthisyeartherewere120rolltransition (PWSCC)indications inthe"A"S/Gand66rolltransition (PWSCC)indications inthe"B"S/G..ThesenumbersincludetubesthatmayhavePWSCCincombination withIGAorSCCinthecrevice.ThiseventisNRCPerformance Indicator SystemCauseCode5.8.4.3,"Maintenance Equipment Failure",
andNUREG-1022 CauseCode(B),"Design,Manufacturing, Construction/Installation."
IV.ANALYSISOFEVENTThiseventisreportable inaccordance with10CFR.50.73,LicenseeEventReportSystem,item(Other)andtheQAManualAppendixBwhichrequiresthat,"Ifthenumberoftubesinagenerator fallingintocategories (a)or(b)belowexceedsthecriteria, thenresultsoftheinspection shallbeconsidered aReportable Eventpursuantto10CFR50.73."Thetubedegradation inthe"A"and"B"S/Gsexceededthecriterion of(b)whichstates,"Morethan1percentofthetotaltubesinspected aredegraded(imperfections greaterthantherepairlimit)".Anassessment wasperformed considering boththesafetyconsequences andimplications ofthiseventwiththe'following resultsandconclusions:
Therewerenooperational orsafetyconsequences resulting fromtheS/Gtubedegradation inexcessoftheQAManualreportable limitsbecause:HRCFORM366A(5-92)
Ci NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQISNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORHATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOHHENTSREGARDING BURDENESTIHATETOTHEINFORNATION ANDRECORDSHANAGEKEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 AND'O"THE PAPERWORK REDUCTION PROJECT(3110-0104),
OFFICEOFNANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYNANE1R.E.GinnaNuclearPowerPlantDOCKETNWBER205000244YEAR94--006--00LERNNNIER6SEQUENTIAL REVISIONPAGE37OF8TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)~Thedegradedtubeswereidentified andrepairedpriortoanysignificant leakageorS/Gtuberuptureoccurring.
~Evenassumingacompleteseverance ofaS/Gtubeatfullpower,asstatedintheR.E.GinnaNuclearPowerPlantUpdatedFinalSafetyAnalysisReport(GinnaUFSAR)section15.6.3(SteamGenerator TubeRupture),
thesequenceofrecoveryactionsensuresearlytermination ofprimarytosecondary leakagewithorwithoutoffsitepoweravailable thuslimitingoffsiteradiation dosestowithintheguidelines of10CFR100.Basedontheabove,itcanbeconcluded thatthepublic'shealthandsafetywasassured'at alltimes.V.CORRECTIVE ACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENT NORMALSTATUSOfthe164tubesrepairedinthe"A"S/G,143tubeswererepairedusinga203/4inchBabcockandWilcoxkinetically weldedtubesheet sleeveinthehotleg.Allofthese143tubeswillremaininservice.Theremaining 21tubeswereremovedfromservicebypluggingboththehotandcoldlegtubeends.Atotalof215tubesinthe"A"S/Garecurrently pluggedand811tubesaresleeved.Ofthe134tubesrepairedinthe"B"S/G,103tubeswererepairedusinga203/4inchBabcockandWilcoxkinetically weldedtubesheet sleeveinthehotleg.Allofthese103tubeswillremaininservice.30tubeswereremovedfromservicebypluggingboththehotandcoldlegtubeends.Theremaining tubewaspreviously pluggedandexhibited acrackindication intheplug.Thesubjecttubeplugwasremovedandanewpluginstalled.
Atotalof315tubesinthe"B"S/Garecurrently pluggedand1390tubesaresleeved.Alltheaboverepairsonthe"A"and"B"S/Gswerecompleted onMarch27,1994,atapproximately 2235EST.HRCFORH366A(5-92)
HRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSIOH ZiICENSEE EVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQQINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION AMDRECORDSMANAGEMENT BRANCH(HNBB771C),U.S.NUCLEARREGULATORY CONHISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFMANAGEMENT ANDBUDGET'WASHINGTOM DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantMxxETHIM(BER205000244YEAR94-006--00LERNWBER6SEQUENTIAL REVISIONPAGE38OF8TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE-Theoccurrence/presence ofIGA,SCC,andPWSCCisaPWRS/Gproblem.Utilities withsusceptible tubingandpartially rolledcrevicesmustdealwiththisrecurring attackonS/Gtubing.R.E.GinnaNuclearPowerPlantwillcontinuecarefulmonitoring ofbothprimaryRCSandsecondary sidewaterchemistry parameters.
Thesewaterchemistry parameters willcontinuetobeevaluated
'againstacceptedindustryguidelines inordertominimizeharmfulprimaryand/orsecondary sideenvironments.
DegradedS/Gtubesshallbesleevedorpluggedinaccordance withtheinservice inspection programandacceptedindustryrepairmethods.\VI.ADDITIONAL INFORMATION A.FAILEDCOMPONENTS:
Thedegradedcomponents areInconel600MillAnnealedU-Bendtubeshavinganoutside.diameterof0.875inchesandanominalwallthickness of0.050inches.Thetubesweremanufactured byHuntington AlloyCompany.B.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistorical searchwasconducted withthefollowing results:Thecreviceindications aresimilartothosereportedinA0-74-02, AO-75-07, R0-75-013, andLERs76-008,77008'8003I 79006'9022I 80003g81009g82003I 8202283-013,89-001,90-004,91-005,92-005,and93-002.C.SPECIALCOMMENTS:
Amorein-depthfinalreportwillbesubmitted totheNRC,asrequiredbytheGinnaQAManual.Asanoteofinterest, RG&Ehasorderednewsteamgenerators forR.E.GinnaNuclearPowerPlanttobeinstalled in1996.HRCFORH366A(592)
I}}
I}}

Revision as of 11:58, 29 June 2018

LER 94-006-00:on 940323,SG Tube Degradation Due to Iga/Scc, Caused QA Manual Reportable Limits to Be Reached.Caused by Pwscc.Tubes repaired.W/940422 Ltr
ML17263A627
Person / Time
Site: Ginna Constellation icon.png
Issue date: 04/22/1994
From: MARTIN J T, MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-94-006, LER-94-6, NUDOCS 9404280277
Download: ML17263A627 (12)
v • d • e


Text

ACCELERATl DOCUMENTDISTRIBUTION SYSTEMREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9404280277 DOC.DATE:

94/04/22NOTARIZED:

NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION MARTIN,J.T.

Rochester Gas&ElectricCorp.MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION DOCKETg05000244RtDP/DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTR ENCLSIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),ncident,Rpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

05000244D

SUBJECT:

LER94-006-00:on 940323,both "A"&"B"steamWestinghouse Series44steamgenerators, requiredcorrective actionduetotubedegradation.

CausewasPWS.Corrective action:tubeswerereaired.W940422ltr.RECIPIENT IDCODE/NAME PD1-3PDINTERNAL:

AEOD/DOAAEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB EXTERNAL:

EG&GBRYCE,J.H NRCPDRNSICPOOREiWCOPIESLTTRENCL111122111111221111221111RECIPIENT IDCODE/NAME JOHNSON,A AEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB N./DSSAQSPLB G~~~02RGN1FILE01LSTLOBBYWARDNSICMURPHY,G.A NUDOCSFULLTXTCOPIESLTTRENCL111111111111111111111111DDDNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTEICONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)

TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR27ENCL27D ITlrlrlr'PIISI 1'lR,'I',"

IIC~~~4~~IIr'oarsscarcROCHFSTER GASANDELECTRICCORPORATION 489EASTAVENUE,ROCHESTER N.K14649-0001 ROBERTCMECREDYVicePresideni CinnaNuclearProducrion TELEPHONE AREACOOEi165462700April22,1994U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate I-3Washington, D.C.20555

Subject:

LER94-006,SteamGenerator TubeDegradation DuetoIGA/SCC,CausesQualityAssurance ManualReportable LimitstobeReachedR.E.GinnaNuclearPowerPlantDocketNo.50-244IInaccordance with10CFR50.73,Licensee.

EventReportSystem,item(Other),andtheGinnaStationQualityAssurance ManualAppendixB,whichrequiresthat,"Ifthenumberoftubesinagenerator fallingintocategories (a)or(b)belowexceedsthecriteria, thenresultsoftheinspection shallbeconsidered aReportable Eventpursuantto10CFR50,73,"theattachedLicenseeEventReportLER94-006isherebysubmitted.

Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytlyyours,RobertC.MecredyXC:U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaSeniorResidentInspector 9404280277 500024+qe0422PDRADOCK0PDP8/7 NRCFORM3665-92)U.SNUCLEARREGULATORY CQIIISSIONAPPROVEDBY(IHINO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednunberofdigits/characters foreachblock)ESTIMATED BURDENPERRESPONSETOCOMPLY'WITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEIHFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION/

WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140.0104),

OFFICEOFHANAGEMENT ANDBUDGETWASHINGTON DC20503.FAGILITYNAIK(1)R.E~GinnaNuclearPowerPlantIDOCKETNQQIER(2)05000244PAGE(3)1OF8TITLE(6)SteamGenerator TubeDegradation DuetoIGA/SCC,CausesQualityAssurance ManualReportable LimitstobeReachedEVENTDATE5LERNWBER6REPORTDATE7OTHERFACILITIES INVOLVED0HONTH03DAYYEAR2394YEAR94SEQUENTIAL HUMBER--006--REVISIONNUMBER00MONTH04DAYYEAR2294FACILITYNAMEFACILITYNAMEDOCKETNUMBERDOCKETNUMBERGRATINGNX)E(9)RRKRLEVEL(10)N000THISREPORTISSUBMITTED PURSUANT20.402(b) 20'05(a)(1)(i)20.405(a)(1)(ii) 20.405(a)(1)(iii) 20.405(a)(1)(iv) 20.405(a)(1)(v) 20.405(c) 50.36(c)(1) 50'6(c)(2)50.73(a)(2)(i) 50.73(a)(2)(ii) 50.73(a)(2)(iii) 50'3(a)(2)(iv) 50.73(a)(2)(v) 50'3(a)(2)(vii) 50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(x) 73.71(b)73.71(c)OTHER(SpecifyinAbstractbelowandinText,HRCForm366ATOTHEREQUIREMENTS OF10CFR:Checkoneormore11LICENSEECONTACTFORTHISLER12NAMEJohnT.St.Martin.Director, Operating Experience TELEPHONE NUMBER(IncludeAreaCode)(315)524-4446C(NPLETEONELINEFOREACHC(NPOHENT FAILUREDESCRIBED INTHISREPORT13CAUSESYSTEMBABCOMPONENT TBGMANUFACTURER H314REPORTABLE TOHPRDSCAUSESYSTEMCOMPONENT MANUFACTURER REPORTABLE TOHPRDSSUPPLEMENTAL REPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBMISSIOH DATE).XNOEXPECTEDSUBMISSION DATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten lines),(16)Duringthe1994AnnualRefueling andMaintenance Outage,subsequent totheeddycurrentexamination performed onboththe"A"and"B"Westinghouse Series44steamgenerators, 164tubesinthe"A"steamgenerator and134tubesinthe"B"steamgenerator requiredcorrective actionduetotubedegradation.

Theimmediate causeoftheeventwasthatthe"A"and"B"steamgenerator tubedegradation wasinexcessoftheGinnaStationQualityAssurance Manualreportable limits.Theunderlying causeofthetubedegradation isacommonsteamgenerator problemofapartially rolledtubesheetcrevicewithrecurring Intergranular Attack/Stress Corrosion Cracking(IGA/SCC) andPrimaryWaterStressCorrosion Cracking(PWSCC)attackonsteamgenerator tubing.ThiseventisNRCPerformance Indicator SystemCauseCode5.8.4.3andNUREG-1022 CauseCode(B).Corrective actiontakenwastoeithersleeveorplugtheaffectedtubeswithacceptedindustryrepairmethods.HRCFORM366(5.92)

HRCFORH366A(5-92)US.NUCLEARREGULATORY C(NIIISSIOH L'ICENSEE EVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(NIBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPOHSETOCOHPLYWITHTHISIHFORHATIOH COLLECTION REQUEST:50.0HRS.FORWARDCOHHENTSREGARDING BURDENESTIHATETOTHEINFORMATION ANDRECORDSHANAGEHEHT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001, ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),

OFFICEOFHANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETNNBER2YEAR0500024494LERNNBER6SEQUEHTIAL

--006--REVISION00PAGE32OF8TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)PRE-EVENT PLANTCONDITIONS iTheplantwasinthecold/refueling shutdowncondition forthe1994AnnualRefueling andMaintenance Outage.TheReactorCoolantSystem(RCS)wasdepressurized andRCStemperature wasapproximately 66degreesF.SteamGenerator (S/G)eddycurrentexamination wasinprogress.

II.DESCRIPTION OFEVENTA.DATESANDAPPROXIMATE TIMESOFMAJOROCCURRENCES:

March23,1994,1500EST:ThenumberofdegradedS/GtubeswasknowntoexceedGinnaStationQualityAssurance (QA)Manualreportable limits,basedoncompletion of"A>>and"B"S/Ghotlegand"A"S/Gcoldleginspection program.Event.dateandtime.fMarch23,1994,1500EST:Discovery dateandtime.March24,1994,1300EST:Oralnotification madetotheNRCOfficeofNuclearReactorRegulation (NRR)thatthenumberofdegradedS/GtubesexceededQAManualreportable limits.March26,1994,1800EST:Alleddycurrentprogramscompleted, andtheevaluation ofthe1994inservice inspection ofS/Gtubescompleted.

March27,1994,2235EST:S/Grepairscompleted.

April8,1994:ASpecialReportwassenttotheUSNRC,reporting thenumberoftubespluggedorsleevedineachS/G.HRCFORH366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(NBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISIHFORHATIOH COLLECTION REQUEST:50.0HRS.FORllARDCONHEHTSREGARDING BURDENESTIHATETOTHEIHFORNATIOH ANDRECORDSHANAGEHEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COHNISSIOH, UASHIHGTOH, DC20555-0001 ANDTOTHEPAPERIIORK REDUCTION PROJECT(3140-0104),

OFFICEOFHANAGEHENT ANDBUDGETllASHIHGTON DC20503.FACILITYNANE1R.E.GinnaNuclearPowerPlantDOCKETIRNBER205000244LERNINBER6YEARSEQUENTIAL 94--006--REVISION00PAGE33OF8TEXl'Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)B.EVENT:Duringthe1994AnnualRefueling andMaintenance Outage,aneddycurrentexamination wasperformed inboththe>>A>>(EMSOlA)and>>B>>(EMSOlB)Westinghouse Series44designrecirculating steamgenerators.

Thepurposeoftheeddycurrentexamination wastoassessanycorrosion ormechanical damagethatmayhaveoccurredduringthecyclesincethe1993examination.

Theexamination wasperformed bypersonnel fromRochester GasandElectric(RG&E)andABBCombustion Engineering.

All-personnel weretrainedandqualified intheeddycurrentexamination method.andhavebeencertified toaminimumofLevelIfordataacquisition andLevelIIfordataanalysis.

Theinitialeddycurrentexaminations ofthe>>A>>and>>B>>S/Gswereperformed utilizing astandardbobbincoiltechnique withdataacquisition beingperformed withtheEDDYNETAcquisition System.Thefrequencies selectedwere400,200,100,and25KHz.Additional eddycurrentexaminations ofthe>>A>>and>>B>>S/Gswereperformed utilizing theZetec3-coilMotorized RotatingPancakeCoil(MRPC)probetoexaminetherolltransition region,selectedcrevicesandsupportplates.Thefrequencies usedfortheseexaminations were400,300,100,and25KHz.I,Theinletorhotlegexamination programplanwasgenerated toprovidetheexamination of100%ofeachopenunsleeved S/Gtubefromthetubeendthroughthefirsttubesupportplate,alongwith20%ofthesetubesbeingselectedandexaminedfortheirfulllength(204randomsampleasrecommended intheElectricPowerResearchInstitute

.(EPRI)guidelines]

withthebobbincoil.Inaddition, 204ofeachtypeofsleevewasexaminedandtheremaining tubewasexaminedfulllength.AllRow1andRow2U-BendregionswereexaminedwiththeMRPCbetweentheg6tubesupportplatehotsideandtheg6tubesupportplatecoldsidefromthecoldlegside.HRCFORH366A(5.92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDSYQ(BNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRAHCH(MHBB7714),U.STNUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAJK1R.E.GinnaNuclearPowerPlantDOCKETlRNBER205000244YEAR94LERNINBER6SEQUENTIALREVISIONM-006--00PAGE34OF8EXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)Resultsoftheaboveexaminations indicated that164tubesinthe>>A>>S/Grequiredrepair(21newrepairsbypluggingand143newrepairsbysleeving).

134tubesinthe>>B>>S/Grequiredrepair(31newrepairsbypluggingand103newrepairsbysleeving).

Corrective actionsweretherefore takenfor164tubesinthe>>A>>S/G,andfor134tubesinthe>>B>>S/G.OnMarch26,1994,atapproximately 1800EST,withtheRCSdepressurized andtemperature atapproximately 66degreesF,finalreviewofthe1994S/Geddycurrentexamination resultswascompleted.

Priortocompletion ofthisreview(onMarch23,1994,atapproximately 1500EST),itwasevidentthatmorethanonepercentofthetotaltubesinspected weredegraded(i.e.,imperfections greaterthantherepairlimit).Becauseoftheabove,theresultsoftheinspection areconsidered areportable eventpursuantto10CFR50.73perAppendixBoftheQAManual.OnMarch24,1994,atapproximately 1300EST,oralnotification wasmadetotheNRCOfficeofNuclearReactorRegulation pursuanttoAppendixBoftheQAManual.OnApril8,1994,aSpecialReportlistingthenumberoftubesrequiredtobepluggedorsleevedineachS/G,wasreportedtotheNRC,pursuanttoAppendixBoftheQAManual.C~INOPERABLE STRUCTURES iCOMPONENTS IORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARY FUNCTIONS AFFECTED:

NoneE.METHODOFDISCOVERY:

Thiseventwasapparentduringthereviewofthe>>A>>and>>B>>S/Geddycurrentexamination results.NRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY C(IIIISSI(NI LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYIGNINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRAHCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140.0104),

OFFICEOF.MANAGEMENT AHDBUDGETWASHIHGTOH DC20503.FACILITYNAME1DOCKETNEER2R.E.GinnaNuclearPowerPlantp5ppp244LERNIMBER6YEARSEQUENTIAL 94--006--REVISION00PAGE35OF8TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)F.OPERATORACTION:TheControlRoomoperators werenotifiedthatthenumberofdegradedtubesexceededthereportable limitsoftheQAManual,andthattheNRC(NRR)hadalreadybeennotifiedbycorporate staff.TheControlRoomoperators completed thenotifications andevaluations requiredbytheA-25.1(GinnaStationEventReport),submitted fortheeventbytheS/Gexamination andrepairsupervision.

G.SAFETYSYSTEMRESPONSES:

NoneIII.CAUSEOFEVENTA.IMMEDIATE CAUSE:Theimmediate causeoftheeventwasthe"A"and"B"S/Gtubedegradation wasinexcessoftheQAManualreportable limits.B.ROOTCAUSE:Theresultsoftheexamination indicatethatIntergranular Attack(IGA)andIntergranular StressCorrosion Cracking(IGSCCorSCC)continuetobeactivewithinthetubesheet creviceregionontheinletsideofeachS/G.Asinthepast,IGA/SCCismuchmoreprevalent inthe"B"S/Gwith74newcreviceindications reportedin1994.Inthe"A"S/G,42newcreviceindications werereportedin1994.In1993,41newcreviceindications werereportedinthe"A"S/G,and103newcreviceindications werereportedinthe>>B"S/G.In1994,42newcreviceindications werereportedinthe"A"S/G,and74newcreviceindications werereportedinthe"B"S/G.Comparison of1993and1994resultsdoesnotsuggestanysignificant changeintherateoftubedegradation duetoIGA/SCC.HRCFORM366A(5-92)

HRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQHISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYWNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYllITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORNARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMAHAGEMEHT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, MASHIHGTOH, DC20555-0001 AHDTOTHEPAPERNORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEHEHT ANDBUDGETl!ASHIHGTON DC20503.FACILITYIUNE1R.E.GinnaNuclearPowerPlantDOCKETHINBER205000244YEARLERIWIER6SEQUENTIAL

--006--REVISION00PAGE36OF8TEXT(IfmorespeceisreqUIred, useedditionel copiesofHRCForm366A)(17)Themajorityoftheinlettubesheet crevicecorrosion indications areIGA/SCCoftheMillAnnealedInconel600tubematerial.

Thisformofcorrosion isbelievedtobetheresultofanalkalineenvironment forminginthetubesheet crevices.

Thisenvironment hasdeveloped overtheyearsasdepositsandactivespecies,suchassodiumandphosphate, havereacted,changinganeutralorinhibited creviceenvironment intotheaggressive environment thatpresently exists.AlongwithIGA/SCCinthecrevices, PrimaryWaterStressCorrosion Cracking(PWSCC)attherolltransition continued tobeactiveduringthelastoperating cycle.Thismechanism wasfirstaddressed in1989,andthisyeartherewere120rolltransition (PWSCC)indications inthe"A"S/Gand66rolltransition (PWSCC)indications inthe"B"S/G..ThesenumbersincludetubesthatmayhavePWSCCincombination withIGAorSCCinthecrevice.ThiseventisNRCPerformance Indicator SystemCauseCode5.8.4.3,"Maintenance Equipment Failure",

andNUREG-1022 CauseCode(B),"Design,Manufacturing, Construction/Installation."

IV.ANALYSISOFEVENTThiseventisreportable inaccordance with10CFR.50.73,LicenseeEventReportSystem,item(Other)andtheQAManualAppendixBwhichrequiresthat,"Ifthenumberoftubesinagenerator fallingintocategories (a)or(b)belowexceedsthecriteria, thenresultsoftheinspection shallbeconsidered aReportable Eventpursuantto10CFR50.73."Thetubedegradation inthe"A"and"B"S/Gsexceededthecriterion of(b)whichstates,"Morethan1percentofthetotaltubesinspected aredegraded(imperfections greaterthantherepairlimit)".Anassessment wasperformed considering boththesafetyconsequences andimplications ofthiseventwiththe'following resultsandconclusions:

Therewerenooperational orsafetyconsequences resulting fromtheS/Gtubedegradation inexcessoftheQAManualreportable limitsbecause:HRCFORM366A(5-92)

Ci NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQISNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORHATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOHHENTSREGARDING BURDENESTIHATETOTHEINFORNATION ANDRECORDSHANAGEKEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 AND'O"THE PAPERWORK REDUCTION PROJECT(3110-0104),

OFFICEOFNANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYNANE1R.E.GinnaNuclearPowerPlantDOCKETNWBER205000244YEAR94--006--00LERNNNIER6SEQUENTIAL REVISIONPAGE37OF8TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)~Thedegradedtubeswereidentified andrepairedpriortoanysignificant leakageorS/Gtuberuptureoccurring.

~Evenassumingacompleteseverance ofaS/Gtubeatfullpower,asstatedintheR.E.GinnaNuclearPowerPlantUpdatedFinalSafetyAnalysisReport(GinnaUFSAR)section15.6.3(SteamGenerator TubeRupture),

thesequenceofrecoveryactionsensuresearlytermination ofprimarytosecondary leakagewithorwithoutoffsitepoweravailable thuslimitingoffsiteradiation dosestowithintheguidelines of10CFR100.Basedontheabove,itcanbeconcluded thatthepublic'shealthandsafetywasassured'at alltimes.V.CORRECTIVE ACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENT NORMALSTATUSOfthe164tubesrepairedinthe"A"S/G,143tubeswererepairedusinga203/4inchBabcockandWilcoxkinetically weldedtubesheet sleeveinthehotleg.Allofthese143tubeswillremaininservice.Theremaining 21tubeswereremovedfromservicebypluggingboththehotandcoldlegtubeends.Atotalof215tubesinthe"A"S/Garecurrently pluggedand811tubesaresleeved.Ofthe134tubesrepairedinthe"B"S/G,103tubeswererepairedusinga203/4inchBabcockandWilcoxkinetically weldedtubesheet sleeveinthehotleg.Allofthese103tubeswillremaininservice.30tubeswereremovedfromservicebypluggingboththehotandcoldlegtubeends.Theremaining tubewaspreviously pluggedandexhibited acrackindication intheplug.Thesubjecttubeplugwasremovedandanewpluginstalled.

Atotalof315tubesinthe"B"S/Garecurrently pluggedand1390tubesaresleeved.Alltheaboverepairsonthe"A"and"B"S/Gswerecompleted onMarch27,1994,atapproximately 2235EST.HRCFORH366A(5-92)

HRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSIOH ZiICENSEE EVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQQINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION AMDRECORDSMANAGEMENT BRANCH(HNBB771C),U.S.NUCLEARREGULATORY CONHISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGET'WASHINGTOM DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantMxxETHIM(BER205000244YEAR94-006--00LERNWBER6SEQUENTIAL REVISIONPAGE38OF8TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE-Theoccurrence/presence ofIGA,SCC,andPWSCCisaPWRS/Gproblem.Utilities withsusceptible tubingandpartially rolledcrevicesmustdealwiththisrecurring attackonS/Gtubing.R.E.GinnaNuclearPowerPlantwillcontinuecarefulmonitoring ofbothprimaryRCSandsecondary sidewaterchemistry parameters.

Thesewaterchemistry parameters willcontinuetobeevaluated

'againstacceptedindustryguidelines inordertominimizeharmfulprimaryand/orsecondary sideenvironments.

DegradedS/Gtubesshallbesleevedorpluggedinaccordance withtheinservice inspection programandacceptedindustryrepairmethods.\VI.ADDITIONAL INFORMATION A.FAILEDCOMPONENTS:

Thedegradedcomponents areInconel600MillAnnealedU-Bendtubeshavinganoutside.diameterof0.875inchesandanominalwallthickness of0.050inches.Thetubesweremanufactured byHuntington AlloyCompany.B.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistorical searchwasconducted withthefollowing results:Thecreviceindications aresimilartothosereportedinA0-74-02, AO-75-07, R0-75-013, andLERs76-008,77008'8003I 79006'9022I 80003g81009g82003I 8202283-013,89-001,90-004,91-005,92-005,and93-002.C.SPECIALCOMMENTS:

Amorein-depthfinalreportwillbesubmitted totheNRC,asrequiredbytheGinnaQAManual.Asanoteofinterest, RG&Ehasorderednewsteamgenerators forR.E.GinnaNuclearPowerPlanttobeinstalled in1996.HRCFORH366A(592)

I

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