ML17264A126

LER 95-006-00:on 950630,34.5 Kv Offsite Power Circuit 751 Was Lost Due to Offsite Lightning Strike & Resulted in Automatic Start of a Edg.Performed Appropriate Actions of Abnormal Procedure AP-ELEC.1 to Stabilize Plant

ML17264A126
Person / Time
Site:	Ginna
Issue date:	07/31/1995
From:	ST MARTIN J T ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17264A125	List: ML17264A124 ML17264A126
References
LER-95-006, LER-95-6, NUDOCS 9508090112
Download: ML17264A126 (8)

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NRCFORM366(5-92)U.S.NUCLEARREGULATORYCOMHISSIONAPPROVEDBYOMBNO.3150-0104EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORllARDCOHMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEHENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMHISSION,WASHINGTON,OC20555-0001ANDTOTHEPAPERNORKREDUCTIONPROJECI'3150.0104),OFFICEOFMANAGEMENTANDBUDGETMASHINGTONDC20503.FAcILITYNAHE(1)R.E~GinnaNuclearPowerPlantDOCKETNUHBER(2)05000244PAGE(3)10F8TITLE(4)Lossof34.5KVOffsitePowerCircuit751,OuetoOffsiteLightningStrike,ResultsinAutomaticStartof>>A>>EmergencyDieselGeneratorEVENTDATE(5)MONI'HDAYYEAR063095YEAR95LERNUHBER(6)SEQUENTIALNUHBER--006--REVISIONNUMBER00HONTHDAY0731YEAR95REPORTDATE(7)FACILITYNAMEDOCKETNUHBERFACILITYNAMEDOCKETNUMBEROTHERFACILITIESINVOLVED(8)OPERATINGMODE(9)PONERLEVEL(10)N097THISREPORTISSUBHITTEDPURSUANT20.402(b)20.405(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)50.36(c)(2)50.73(a)(2)(i)50.73(a)(2)(ri)50.73(a)(2)(iii)50.73(a)(2)(iv)50.73(s)(2)(v)50.73(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,NRCForm366A)TOTHEREQUIREHE:ITSOF10CFRrit(Checkoneormore)(11)LICENSEECOHTACTFORTHISLER(12)NAHEJohnT.St.Hartin-TechnicalAssistantTELEPHONENUMBER(IncludeAresCode)(716)771-3641COMPLETEONELINEFOREACHCOHPONEHTFAILUREDESCRIBEDINTHISREPORT(13)CAUSESYSTEMCOHPONENTMANUFACTURERREPORTABLETONPRDSCAUSESYSTEHCOMPOHENTMANUFACTURERREPORTABLETONPRDS~EACBL5XOOOSUPPLEHEHTALREPORTEXPECTED(14)YES(Ifyes,corrpleteEXPECTEDSUBHISSIONDA'IE).XNOEXPEC'TEDSUBHISSIONDATE(15>MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately15single-spacedtypewrittenlines)(16)OnJune30,1995,atapproximately1528EDST,withthereactoratapproximately97%steadystatepower,powerfromCircuit751(34.5KVoffsitepowersource)waslost,duetoalightningstrikeonanoffsiteutilitypoleforCircuit751.Thisresultedindeenergizationof4160Voltbus12Aand"A"train480Voltsafeguardsbuses14and18.The"A"EmergencyDieselGenerator(D/G)automaticallystartedandreenergizedbuses14and18asperdesign.Therewasnochangeinreactorpowerorturbineload.ImmediatecorrectiveactionwastoperformtheappropriateactionsofAbnormalProcedureAP-ELEC.1(Lossof12AAnd/Or12BBusses)tostabilizetheplantandtoverifythatthe"A"EmergencyD/Ghadstartedandreenergizedbuses14and18.ThiseventisNUREG-1022CauseCode(C).CorrectiveactiontopreventrecurrenceisoutlinedinSectionV.B.NRCFORM366(592)9508090ii2950731PDRADQCK05000244SPDR NRCFORM366A(5-92)U.S~NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOMBNO.31500104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYMITHTHISINFORHATIONCOLLECTIOHREQUEST:50.0HRS.FORNARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYC(XQISSION,IIASHIHGTON,DC20555-0001ANDTOTHEPAPERNORKREDUCTIONPROJECT(3150-0104),OFFICEOFMANAGEMENTAHDBUDGETNASHINGTOHDC20503.FACILITYNAHE(1)REEDGinnaNuclearPowerPlantDOCKETNUMBER(2)05000244YEARLERNUMBER(6)SEQUENTIALNUMBER95--006--REVISIOHNUMBER00PAGE(3)20F8TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)I.PRE-EVENTPLANTCONDITIONSTheplantwasatapproximately97%steadystatereactorpowerwithnomajoroperationalactivitiesinprogress.Athunderstormwasinprogressinthevicinityoftheplant.Theoffsitepowerconfigurationtotheplantwasinthenormal"50%/50%"offsitepowerlineup:Circuit751(34.5KVoffsitepowersource)wassupplyingpowertothe"A"train480Voltsafeguardsbuses14and18through34.5KVto4160Volttransformer12A(12Atransformer)to4160Voltbus12A,andthroughthesafeguardsbus4160Voltto480Volttransformers.Circuit767(34.5KVoffsitepowersource)wassupplyingpowertothe"B"train480Voltsafeguardsbuses16and17through34.5KVto4160Volttransformer12B(12Btransformer)to4160Voltbus12B,andthroughthesafeguardsbus4160Voltto480Volttransformers.II.DESCRIPTIONOFEVENTA.DATESANDAPPROXIMATETIMESOFMAJOROCCURRENCES:oJune30,1995,1528EDST:Eventdateandtime.oJune30,1995,1528EDST:Discoverydateandtime.June30,1995,1528EDST:ControlRoomoperatorsverifythe"A"EmergencyDieselGenerator(D/G)operationandthatsafeguardsbuses14and18andInstrumentBus"B"areenergized.June30,1995,1702EDST:Safeguardsbuses14and18weretransferredtoCircuit767fromthe"A"EmergencyD/G.June30,1995,1708EDST:The"A"EmergencyD/Gwasstoppedandrealignedforautostandby.June30,1995,1814EDST:Circuit751declaredoperable.oJuly2,1995,2343EDST:Offsitepowerconfigurationwasrestoredtothenormaln50%/50%"lineup.HRCFORM366A(5-92)

NRCFORH366A(5.92)U.S.NUCLEARREGULATORYCOHHISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOHBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOHHENTSREGARDINGBURDENESTIHATETOTHEIHFORHATIONANDRECORDSHANAGEHENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOMHISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31500104),OFFICEOFMANAGEHENTANDBUDGETWASHINGTONDC20503.FACILITYNAHE(1)R.E.GinnaNuclearPowerPlantDOCKETNUHBER(2)05000244YEAR95LERNUHBER(6)SEQUENTIALNUHBER--006--REVISIOHNUHBER00PAGE(3)3OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)B.EVENT:OnJune30,1995,atapproximately1528EDST,withthereactoratapproximately97%steadystatefullpower,theControlRoomreceivednumerousannunciatoralarms,includingAnnunciatorE-14(LOSSBINSTR.BUS).TheControlRoomoperatorsdeterminedthatCircuit751(34.5KVoffsitepowersource)wasdeenergized,andthat"A"train480Voltsafeguardsbuses14and18hadlosttheirpowersupplyfrom4160Voltbus12A.The"A"EmergencyD/Ghadautomaticallystartedandwastiedtosafeguardsbuses14and18.Buses14and18hadbeenmomentarilydeenergizedand120VoltACInstrumentBus"B"(poweredfrombus14)hadalsobeenmomentarilydeenergized.TheControlRoomoperatorsverifiedthatreactorcoolantsystemtemperatureandpressurewerestable,andthattherewasnochangeinreactorpowerorturbineload.TheyperformedtheappropriateactionsofAbnormalProcedureAP-ELEC.1(Lossof12AAnd/Or12BBusses)tostabilizetheplant.Theyverifiedthatthe"A"EmergencyD/Gwasoperatingproperlyandthatsafeguardsbuses14and18andInstrumentBus"B"wereenergized.TheControlRoomoperatorsobservedthatCircuit751andbus12Adisplayedzero(0)voltage.ThelossofpowerfromCircuit751resultedinundervoltageonsafeguardsbuses14and18,andthe"A"EmergencyD/Gautomaticallystartedwithinten(10)secondsasperdesignandreenergizedthesebuses.Whenbus14wasreenergized,InstrumentBus"B"wasalsoautomaticallyreenergized.EnergyOperationspersonnelwerenotifiedconcerningthelossofCircuit751.Personnelfromthe"Engineering,Operations,andGasServices"departmentinvestigatedfieldconditionsanddeterminedthatalightningstrikecausedthelossofpowerfromCircuit751,anddeterminedthelocationofthelightningstrike.TheControlRoomoperatorsreferredtoEquipmentRestorationprocedureER-ELEC.l(RestorationofOffsitePower)torestoreoffsitepowerto4160Voltbus12Aand480Voltsafeguardsbuses14and18.TheControlRoomoperatorsclosed4160Voltcircuitbreaker52/12BYtoenergizebus12AfromCircuit767,viathe12Btransformer,atapproximately1557EDST.Atapproximately1702EDST,safeguardsbuses14and18weretransferredtoCircuit767fromthe"A"EmergencyD/G.(Circuit767hadremainedinoperation,supplying"B"train480Voltsafeguardsbuses16and17throughouttheevent.)NRCFORH366A(592)

HRCFORH366A(5-92)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEHENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHIHGTON,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECt(3140-0104),OFFICEOFDC20503.MANAGEMENTANDBUDGETWASHINGTONFACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKEl'UHBER(2)05000244YEARLERNUMBER(6)SEQUENTIALNUHBER95--006--REVISIONNUMBER00PAGE(3)4OF8TEXT(Ifmorespaceisrequired,useadditionaIcopiesofNRCForm366A)(17)Atapproximately1708EDST,June30,1995,the"A"EmergencyD/Gwasstoppedandrealignedforautostandby.Circuit751wasdeclaredoperableatapproximately1814EDST,butwasmaintainedastheplant'sbackupsupplyofoffsitepowerratherthanrealigningtheelectricalsystemduringcontinuingthunderstormconditions.CINOPERABLESTRUCTURESICOMPONENTSrORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:Themomentarylossofpowertobuses14and18(at1528EDST)causedthetripofthecommonsamplepumpforradioactiveeffluentmonitoringofplantventilationbychannelsR-10B(iodine),R-13(particulate),andR-14(noblegas).ChannelR-14Aremainedoperable,providingmonitoringforiodineandnoblegases,asrequiredbyTechnicalSpecificationsTable3.5-5Action4~ChannelR-14Aalsocontinuouslycollectedsamplesforparticulatemonitoring,asrequiredbyTable3.5-5Action5andTable4.12-2ItemE.Thecommonsamplepumpwasrestartedatapproximately1544EDST.E.METHODOFDISCOVERY:ThiseventwasimmediatelyapparentduetoMainControlBoardalarmsandindicationsintheControlRoomwhenpowerfromCircuit751waslost.TheseincludedMainControlBoardAnnunciatorE-14(LOSSBINSTR.BUS)andtheindicatinglightsforbus14andbus18supplybreakers.NRCFORH366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORYCOHHISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOHBNO.3150.0104EXPIRES5/31/95ESTIHATEOBURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIONCOLLECTIONREOUEST:50.0HRS.FORWARDCOHHEHTSREGARDINGBURDENESTIHATETOTHEINFORHATIONANDRECORDSHANAGEHENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOHHISSION,WASHINGTON,DC205550001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFHANAGEHEN'IANDBUDGETWASHINGTONDC20503.FACILITYNAHE(1)R.E.GinnaNuclearPowerPlantDOCKETNUHBER(2)05000244YEARLERNUHBER(6)SEQUENTIALNUHBERREVISIONNUMBER00PAGE(3)5OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)F.OPERATORACTION:Followingtheundervoltageconditiononbuses14and18,the"A"EmergencyD/Gautomaticallystartedandreenergizedthesebuses.TheControlRoomoperatorsperformedtheappropriateactionstoverifythatthe"A"EmergencyD/Gwasoperatingproperly,safeguardsbuses14and18wereenergized,andInstrumentBus"B"wasenergized.WhenInstrumentBus"B"wasreenergized,RodControlgeneratedanautomaticsignaltomovecontrolrodsout.TheControlRoomoperatornotedthisrodmotionandtranferredRodControltomanual.Whentheautomaticsignalstabilized,rodsweretransferredbacktoautomatic(atapproximately1535EDST).Letdownlineflowandpressurewereoscillating,andthedemandsignalfortheletdownpressurecontrolvalve(PCV-135)wascyclinginphasewiththeseoscillations.PCV-135wasplacedinmanualtostabilizetheletdownlineparameters.Subsequently,PCV-135wasreturnedtoautomaticoperationafterletdownlineparameterswerestabilized.TheShiftSupervisornotifiedhighersupervisionofthelossofCircuit751,andcontactedEnergyOperationspersonneltodeterminetheproblemwithCircuit751.TheControlRoomoperatorsrestoredoffsitepower(fromCircuit767)tobuses14and18,stoppedthe"A"EmergencyD/G,andrealigneditforautostandby.Subsequently,theShiftSupervisornotifiedtheNRCatapproximately1754EDSTper10CFR50.72(b)(2)(ii).G.SAFETYSYSTEMRESPONSES'llsafeguardsequipmentfunctionedproperly.The"A"EmergencyD/Gautomaticallystartedduetotheundervoltageconditiononbuses14and18,displayedpropervoltageandfrequency,andreenergizedsafeguardsbuses14and18tosupplyemergencypower.Runningcontainmentrecirculationfansonbus14trippedasdesigned,andweremanuallyrestartedasneededtorestorenormalcoolingtotheContainment.Runningservicewaterpumpsonbus18trippedasdesigned,andthepumpselectedforautostartstartedwhenpowerwasrestoredtobus18.NRCFORH366A(5-92)

HRCFORM366A(5-92)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYIIITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHING'ION,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYHAME(1)R.E.GinnaNuclearPowerPlantDOCKETNUMBER(2)YEAR0500024495LERNUMBER(6)SEQUEHTIALNUMBER--006--REVISIONNUMBER00PAGE(3)6OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)III.CAUSEOFEVENTA.IMMEDIATECAUSE:Theautomaticactuationofthe"A"EmergencyD/Gwasduetoundervoltageonsafeguardsbuses14and18.B.INTERMEDIATECAUSE:Theundervoltageonsafeguardsbuses14and18wasduetothelossofpowerfromCircuit751.C.ROOTCAUSE:TheunderlyingcauseofthelossofpowerfromCircuit751-wastrippingofprotectiverelaysforCircuit751duetoanelectricalsurgefromalightningstrikeonanoffsiteutilitypoleforCircuit751.ThiseventisNUREG-1022CauseCode(C),ExternalCause.ThislossofpowerandsubsequentstartofanEmergencyD/GdoesnotmeettheNUMARC93-01,"IndustryGuidelineforMonitoringtheEffectivenessofMaintenanceatNuclearPowerPlants",definitionofa"MaintenancePreventableFunctionalFailure".IV.ANALYSISOFEVENT:Thiseventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorconditionthatresultedinamanualorautomaticactuationofanyengineeredsafetyfeature(ESF),includingthereactorprotectionsystem(RPS)",inthatthestartingofthe"A"EmergencyD/GwasanautomaticactuationofanESFsystem.HRCFORM366A(592)

NRCFORH366A(5-92)U.S~NUCLEARREGULATORYCOHMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOHPLYWITHTHISIHFORHATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORHATIONAHDRECORDSHANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMHISSION~WASHIHGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3180-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKETNUMBER(2)YEAR05000244g5LERNUMBER(6)SEQUENTIALNUMBER--006--REVISIONNUMBER00PAGE(3)7OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthiseventwiththefollowingresultsandconclusions:oAllreactorcontrolandprotectionsystemsperformedasdesigned.oThe"A"EmergencyD/Goperatedasdesignedbyautomaticallystartingandsupplyingemergencypowertosafeguardsbuses14and18.Circuit767remainedinoperationsupplyingpowertothe"B"trainsafeguardsbuses;subsequentlyCircuit767waslineduptoalsosupplypowertothe"A"trainsafeguardsbusesaspermittedbyplanttechnicalspecifications.oRadiationmonitorchannelsR-10B,R-13,andR-14weretemporarilylost.Theirredundantmonitor(R-14A)remainedoperableduringthisevent,providingradioactiveeffluentmonitoringforplantventilation.Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVEACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENTNORMALSTATUS'ffsitepowerwasrestoredtosafeguardsbuses14and18fromCircuit767,andthe"A"EmergencyD/Gwasstoppedandrealignedforautostandby.ThecommonsamplepumpforR-10B,R-13andR-14wasrestarted.B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE:Optionsforoffsitepowerconfigurationtotheplantwillbereevaluated,tooptimizereliabilityduringadverseweatherconditions.NRCFORM366A(592)

NRC'ORH366A(5.92)U.S~NUCLEARREGULATORYCOHHISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOHBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDEHPERRESPONSETOCOHPLYHITHTHISIHFORHATIONCOLLECTIOHREQUEST:50.0NRS.FORNARDCOHHEHTSREGARDINGBURDENESTIHATETOTHEINFORHATIONANDRECORDSHANAGEHENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOHHISSION,UASHINGTON,DC20555-0001ANDTOTHEPAPERIJORKREDUCTIONPROJECT(3150-0104),OFFICEOFHANAGEHENTANDBUDGETNASHINGTONDC20503.FACILITYNAHE(1)R.E.GinnaNuclearPowerPlantDOCKETHUHBER(2)05000244YEAR95LERNUHBER(6)SEQUENTIALHUNGERREVISIONNUHBER--006--00PAGE(3)8OF8TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)VI.ADDITIONALINFORMATIONA.FAILEDCOMPONENTS:NoneB.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistoricalsearchwasconductedwiththefollowingresults:LERs91-002,92-007,and94-012weresimilareventswithsimilarrootcauses(startofanEmergencyD/Gduetolossofoffsitepowerfromexternalcauses).C.SPECIALCOMMENTS:NoneNRCFORH366A(5-92)