ML17262A291

LER 90-016-00:on 901212,reactor Trip Occurred from Inadvertent Intermediate Range Trip.Caused by de- Energization of One Out of Two Intermediate Range Nuclear Instrument Sys High Flux Trip bistable.W/910111 Ltr

ML17262A291
Person / Time
Site:	Ginna
Issue date:	01/11/1991
From:	BACKUS W H, MECREDY R C ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-016, LER-90-16, NUDOCS 9101160176
Download: ML17262A291 (9)

Text

ACC.'LILERATL'DD!c~RIBUTIONDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9101160176DOC.DATE:91/Ol/11NOTARIZED:NODOCKETFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG05000244AUTH.NAMEAUTHORAFFILIATIONBACKUS,W.H..RochesterGas&ElectricCorp.MECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONR

SUBJECT:

LER90-016-00:on901212,reactortripoccurredfrominadvertentintermediaterangetrip.Causedbyde-energizationofoneouttwointermediaterangenuclearinstrumentsyshighfluxtripbistable.W/910111ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRENCL2SIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.NOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72)ieDS05000244A,RECIPIENTIDCODE/NAMEPD1-3LAJOHNSON,AINTERNAL:ACNWAEOD/DSP/TPABNRR/DET/ECMB9HNRR/DLPQ/LHFB11NRR/DOEA/OEABNRR/DST/SELB8DNRR/DSTSPLB8D1RRG1EXTERNALEG&GBRYCEEJ~HNRCPDRNSICMURPHY,G.AsCOPIESLTTRENCL111122111111111111..11113311)11RECIPIENTIDCODE/NAMEPD1-3PDAEOD/DOAAEOD/ROAB/DSP.NRR/DET/EMEB7ENRR/DLPQ/LPEB10NRR/DREP/PRPB11NRR/DST/SICB7ENRR/DST/SRXB8ERES/DSIR/EIBLSTLOBBYWARDNSICMAYS,GNUDOCSFULLTXTCOPIESLTTRENCL111~1221,11'22111111111111D/u'oJ;Loot(c(~r2(DNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEO'ASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPI-37(EXT.-"0079)TOELIMINATEYOURNAiv1EFROil'IDISTRIBUTIONIISTSFORDOCUXIENTSYOUDON'7NEED!DDFULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR31ENCL31

~pROCHESTERGASANDELECTRlCCORPORATION+89EASTAVENUE,ROCHESTERN.Y.1464&-000'fPU'l>tP<1kMfkll/',W<<el'gteCtlf1'40I,dTkkr',v'i'REACOD%V>t54627COJanuary11,1991U.S.NuclearRegulatoryCommissionDocumentControlDeskWashington,DC20555

Subject:

LER90-03.6,.InadvertentIntermediateRangeTripDuringTransferof480VoltBus14tothe"A"EmergencyDies'elGeneratorCausesaReactorTripR.E.GinnaNuclearPowerPlantDocketNo.50-244~Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"anyeventorconditionthat.resultedinmanualorautomaticactuationofanyEngineeredSafetyFeature(ESF),includingtheReactorProtec-tionSystem(RPS)",theattachedLicenseeEventReportLER90-016isherebysubmitted.Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,RobertC.Ntu:red//xc:U.S.NuclearRegulatoryCommissionRegionI475.AllendaleRoadKingofPrussia,PA19406GinnaUSNRCSeniorResidentInspector9101160176910111Pl3RADOCK0.000244PDR~)pg,IP(ppgIcP

~~Ql~J.~~~IP~~qua~~s~IIQQ~I~'mIPmRISImmRRIIIRRIPRIERIPmROR~~~IIgill%5RRI~IIIRRRRRK%RRRQ~.~~~~~-~SS~~~RRRWRiR~RK~RESRE888llh8%hWI%%ll58MRlll5lllll%h8h~~--~-~~-~-P~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~P~~~~~~~~~~~~~0~~~~~e~~~~~~~~~

NACtormSSSAI9451LICENSEEEVENTREPORTILER)TEXTCONTINUATIONV.S.HVCLSAIIIISOVLATOIIYCOMMISSION/AttROVSOOMSHO5ISO&105SNSINas.SnIISstACILITTHAM9IIIOOCKSTNVMSKIIITILSNNVMSS1IS)550V5H5IALHVM15VI$IOHHVMSA~ACSISIR.E.GinnaNuclearPowerPlantTG(TINmorttoootNrtsvvto.vtooornoootrwICArm~'tlIITI0500I0"f2449Q-016QIOQ20FQ7PRE-EVENTPLANTCONDITIONSTheplantwasintheprocessofstartingupsubsequenttotheplanttripof12/ll/90(discussedinLER90-013).Thereactorwasatapproximately3%fullpowerawaitingclearancethatsecondarychemistryparameterswerewithinspecification.TheControlRoomoperators'ereintheprocesso'ftransferringBus14fromitsnormalpowersupplytothe"A"EmergencyDieselGeneratoraspartoftherepairprocedurefortheBus14UndervoltageMonitoringSystem.TheBus14UndervoltageMonitoringSystemEvent'isdiscussedinLER90-015.DESCR1PTIONOFEVENTA.DATESANDAPPROXIMATETIMESOFMAZOROCCURRENCES:December12,1990,2322EST:EventDateandTime0December12,1990,2322EST:DiscoveryDateandTimeDecember12,1990,2322EST:ControlRoomoperatorsverifybothReactorTripBreakersopenandallControlandShutdownRodsinserted.December12,1990,2327EST:ControlRoomoperatorsclosebothMainSteamIsolationValves(MSIVs)toterminateplant,cooldown.0December12,1990,2332EST:Plantstabilizedathotshutdown.HACtOAMSSSA<945I IIIICfoam5IA19551LICENSEEEVENTREPORTILER)TEXTCONTINUATIONV54VCI.IAAAIQVIAIVHvCOMMI55104A~A4OVfOOM540lI500>OAfroi4f$9rllQ55ACII,ITYHAMfIII0OC4f14VM5f4"!"VfII4VM9f4141SfOV541IA1.VVU14AIV'5C>rVVIAAACII>>H.E.GirrnaNUclearPowerPlant:ZfIffIIfmensauce4~.vwecrVawrHACAnn~~II11105Io(0jo24490016-0(00i3or.07B.1W19lT:OnDecember12,1990,atapproximately,2322EST,withthereactoratapproximately34fullpower,.theoperatorsweretransferringpowersuppliesforBus14,perthedirectionofprocedureM-48.14(IsolationofBus14UndervoltageSystemforMaintenance,Troubleshooting,ReworkandTest).Duringthistransfer,amomentarylossofpoweroccurstoBus14.Bus14feedsMCC-1C,whichfeedsInstrumentBus1B.'herefore,InstrumentBus1Bhadamomentarylossofpower,whichde-energizedthebistableforIntermediateRange(IR)NuclearInstrumentSystem(NIS)Hi,ghFluxTrip,forIRNISChannelN-36.Thisreactortripwasduetoone(1)outoftwo(2)IRNISHighFluxTripbistablesbecomingde-energized.TheControlRoomoperatorsimmediatelyperformedtheapplicableactionsofEmergencyOperatingproceduresE-0(ReactorTripOrSafetyInjection)andES-0.1(ReactorTripResponse)andstabilizedtheplantinhotshutdown.Subsequently,theMSIVswereclosedtoterminateaplantcooldown.TheControlRoomoperatorsnotifiedhighersupervisionandtheNuclearRegulatoryCommission(NRC)ofthereactortrip.C.INOPERABLESTRUCTURES,COMPONENTS,ORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:None.D.OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:None.E.METHODOFDISCOVERYTheeventwasimmediatelyapparentduetoalarmsandindicationsintheControlRoom.

~~~o~~~~~,0~~~~~~~~~~~~~~~Pg~~~~~~~~~~~

IIIICswm~A1949ILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONUSHUCLCAAAICULAIQAYCOMM>SSIOHAeeAOYCOOudsO9150OI04CeelRCSdgICSSACILITYIIAMClllOOCXCTIIUMCCII'CILCIIHVMCCIIICISCQUShe<AL4UvCweSS'5CHRUMSIe~ACC151R.E.GinnaNuclearPowerPlantTEXTllfmmeleeeeHrevved,weeeeelemMHACPornPC@'el11110/GIORNO(0(2(449l0OtlG-0I00(50F07accomplishthisloadtransferpresentsaprobabilityofareactortrip(ifbelowPermissiveP-10)oraturbinerunback(if.abovePermissiveP-10withtheIRHighFluxtripsignalblocked).AnyswitchingsequenceperformedintheControlRoomtomeettheTechnicalSpecificationsrequirementswillpresentsomeprobabilityofanEngineeredSafetyFeature(ESF)actuation.IV.ANALYSISOFEVENTThiseventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),.whichrequiresreportingof"anyeventorconditionthatresultedinmanualorautomaticactuationofanyEngineeredSafetyFeature(ESF),includingtheReactorProtectionSystem(RPS),"inthattheIRNISHighFluxReactorTripwasanautomaticactuationoftheRPS.Anassessmentwasperformedconsideringboththesafetyconsequencesand'implicationsofthiseventwiththefollowingresultsandconclusions:oThetworeactortLipbreakersopenedasrequired.oAllcontrolandshutdownrodsinsertedasdesigned.oTheplantwasstabilizedinhotshutdown.ThistransientwascomparedtothetransientsdescribedintheGinnaUpdatedFinalSafetyAnalysisReport(UFSAR).NoneoftheassumptionsoftheUFSARwereviolatedduringthisevent.TheresponseoftheplanttothistransientisboundedbytheresultsoftheUFSARanalysis.Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.

~~~~~~~~~SQRRR8858l9K%o>>>>$II~I>ON~~~y~~>~N~~~PN0~~~~~~-~~'ON~I~'N~PI~~N~~~~~~~0~~~~~~~~~~~~~oi~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~MR%9RR85%88PFH~ir~IIIII~~)~~~'A~~I'es~I8~~~~~~~~~~IIQI~~~I~~~~I~~~