ML18037A084
| ML18037A084 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 02/19/1993 |
| From: | FARRAR D COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9302250251 | |
| Download: ML18037A084 (16) | |
See also: IR 05000237/1992028
Text
.ACCELERATEDDOCUMENTDISTRIBUTIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)CESSIONNBR:9302250251DOC.DATE:93/02/19NOTARIZED:NODOCKET¹CIL:50-237DresdenNuclearPowerStation,Unit2,CommonwealthE0500023750-24/Dresden.NuclearPowerStation,Unit3,CommonwealthE05000249AUTH.NAMEAUTHORAFFILIATIONFARRAR,DECommonwealthEdisonCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)SUBJECT:RespondstoNRCltrreviolationsnotedininsprept50-237/92-28650-249/92-28.Correctiveactions:Unit2LPCIfusechangedouton930219.W/930219ltr.'IDISTRIBUTIONCODE:IE01DCOPIESRECEIVED:LTRENCLSIZE:TITLE:General(50Dkt)-InspRept/NoticeofViolationResponseNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(12/22/72).05000237RECIPIENTIDCODE/NAMEPD3-2PDINTERNAL:ACRSAEOD/DEIBAEOD/TTCNRRMORISSEAUiDNRR/DOEA/OEABNRR/DRIL/RPEB10NRR/PMAS/ILPB2NUDOCS-ABSTRACTOGC/HDS2RGN3FILE01EXTERNAL:EG&G/BRYCEgJ.H.INSICCOPIESLTTRENCL11221111111111111111111111RECIPIENTIDCODE/NAMESTANGiJAEODAEOD/DSP/TPABDEDRONRR/DLPQ/LHFBPTNRR/DREP/PEPB9HNRR/PMAS/ILPB1NRR/PMAS/ILRB12OED:E~LE02NRCPDRCOPIESLTTRENCL1111111111111111111111NOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR25ENCL25
eCommonwealthEdison1400OpusPlaceDownersGrove,illinois60515February19,1993U.S.NuclearRegulatoryCommissionWashington,D.C.20555Attention:DocumentControlDeskSubject:DresdenNuclearPowerStationUnits2and3ResponsetoNoticeofViolationInspectionReport50-237/92028;50-249/92028NRCDocketNumbers50-237and50-249Reference:T.O.MartinlettertoL.O.Delseorge,datedJanuary20,1993,transmittingInspectionReport50-237/92028;50-249/92028EnclosedisCommonwealthEdisonCompany's(CECo)responsetotheNoticeofViolation(NOV)whichwastransmittedwiththereferencedletter.TheNOVcitedtwoSeverityLevelIVviolationsrequiringawrittenresponse.Theresponsetotheseviolationsisprovidedintheattachment.Ifyourstaffhasanyquestionsorcommentsconcerningthisletter,pleasereferthemtoDeniseSaccomando,ComplianceEngineerat(708)663-7285.Sincerely,cZ~A~D.FarrarNuclearRegulatoryServicesManagerAttachmentcc:A.B.Davis,RegionalAdministrator-RegionIIIJ.Stand,ProjectManager-NRRM.N.Leach,SeniorResidentInspector-Dresden9302250251930219PDRADOCK05000237QPDRZNLD/2112/13
ATIACHMENTRESPONSETONOTICEOFVlOLATIONNRCINSPECTlONREPORT50-237/92028,50-249/92028.Viln:2792021.22210CFR50,AppendixB,CriterionV,requiresthatactivitiesaffectingqualityshallbeprescribedbydocumentinstructions,procedures,ordrawings,ofatypeappropriatetothecircumstancesandshallbeaccomplishedinaccordancewiththeseinstructions,procedures,ordrawings.ProcedureDOP6900-07,Revision9,"125VdcGroundDetections",requiredthattheprocedurebeimmediatelyperformedatDCsystemgroundsabove60Vdc,andaB1WorkRequestbesubmittedoncethegroundwaslocated.Furthermore,theprocedurerequired,atgroundsabove115Vdc,initiationofa14daytimeclock(administrativeLimitingConditionforOperation(LCO))tolocateandremovethegroundandpreparationofaJustificationforContinuedOperation(JCO)ifthegroundcouldnotbelocatedorisolatedwithin14days.ProcedureDAP07-05,Revision9,"OperatingLogsandRecords",ParagraphB.5,requiredthatwhenaLCOentryoccurs,theeventmustbeloggedintheLCOLog.Contrarytotheabove:1.OnSeptember26,1992,whena125VdcsystemgroundwaspresentinUnit3,theLicenseefailedtoinitiateactionstolocateandremovetheground.Inaddition,theLicenseefailedtoinitiateanadministrativeLCOanddocumenttheeventintheLCOLog.2.OnNovember3,1992,when125VdcgroundswerepresentinbothUnits2and3,anadministrativeLCOwasinitiatedandloggedintheLCOLogforUnit3only.TheLicenseecouldnotprovideevidencethatactionsweretakentoidentifyandremovethegroundsineitherunit.3.OnNovember12,1992,whena125VdcgroundwaspresentinUnit3,thelicenseefailedtoinitiateactionstolocateandremovetheground.ZNLD/2112/14
ATIACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECTIONREPORT50-237/92028,50-249/92028.REAONFVILATION:DresdenStationconcurswithitem1oftheviolationaswritten.DresdenStationproceduresprovideclearguidanceonrequiredactionsuponidentificationofdcgrounds.Itisclearthatpersonnelfailedtomeetmanagement'sexpectations.Investigationoftheeventsindicatedthatpersonnelfailedtofollowestablishedstationprocedures.WiththeissuanceoftheviolationDresdenStationinitiatedaninvestigationwhichrevealedthatstationdidtakeappropriateactionsonNovember3andNovember12thInregardtotheNovember3,1992,groundinvolvingUnit3(example2),actionwastakentoidentifyandremovetheground.TheUnit3Logentrystatesthatagroundcheckwasperformedat1857hoursfora-155Vgroundonthe125Vdcsystem.Thegroundwasidentifiedonbus3A-2circuitnumber16andWorkRequestD-13836waswrittenforinvestigationandrepairofthecircuit.ElectricalMaintenanceidentifiedandreplacedabrokenterminalblock.Furthertestingrevealedthattheauxiliarytransformer31fireprotectioncircuitwasgrounded.WorkRequest15077waswrittentoimplementrepairs.lnregardtotheNovember3,1992,groundinvolvingUnit2(example2),actionwastakentoidentifyandremovetheground.WorkRequestD-13806waswrittenforinvestigationoftheground;however,thegroundclearedbeforeElectricalMaintenancepersonnelcouldbeginwork.TheUnit2groundwasnotdocumentedintheLCOLogsinceitneverreachedtherequired115volts,asspecifiedinDOP6900-06,'125VdcGroundDetection".InregardtotheNovember12,1992,groundinvolvinqUnit3(example3),actionwastakentolocateandremovetheground.TheUnitOperatorloggedthe-115Vground,thegroundchecking,andtheLCOintheUnitLogBook.Thegroundwaslocatedonbus3A-2.NoworkrequestwaswrittensinceWorkRequestsD-13836andD-15077werealreadyopentoinvestigatethegroundonbus3A-2.OnNovember16,1992,WorkRequestD-14129waswrittentodocumenta-90VgroundontheUnit3125Vdcsystem.ElectricalMaintenancepersonnelinvestigatedandresolvedthegroundunderworkrequestsD-13836andD-15077.ThegroundwasmonitoreduntilJanuary2,1993,andneverreturned.RRECNANDIVEDForexample1,theidentifiedgroundhasclearedwithoutanyactionbystationpersonnel.OperationspersonnelinvolvedintheSeptember26,1992,eventwerecounseledbyOperations'sseniormanagementwithregardstotheimportanceofprocedureadherence.ZNLD/2112/15
ATTACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECTIONREPORT50-237/92028,50-249/92028.QQQQEVETEDRTHEVNTheOperationsManagerhasdiscussedfailuretofollowestablishedprocedureswiththeShiftEngineers.BeginningonFebruary10,1993,theShiftEngineerstailgatedwiththeirrespectivecrewstheimportanceoffollowingprocedures.Theywereremindedthatadherencetoproceduresisabasicexpectationandisrequiredtoensuresafe,reliableoperations.DATEFLLMPLIANEFullcompliancewasachievedwhentheindividualwascounseled.ZNLO/2112/16
ATIACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECT(ONREPORT50-237/92028,50-249/92028,TION:242210CFR50,AppendixB,CriterionXVI,requiresthatmeasuresshallbeestablishedtoassurethatconditionsadversetoquality,suchasfailures,malfunctions,deficiencies,deviations,defectivematerialandequipment,andnonconformancearepromptlyidentifiedandcorrected.Contrarytotheabove,inFebruaryandApril1992,thelicenseeidentifiedoversizedfusesinvarioussafetyrelatedcircuitsincludingtheEmergencyDieselGeneratorexcitersandLowPressureCoolantcircuitry.AsofDecember,1992,thisconditionadversetoqualityhadnotbeencorrected.REASNFRTHEVITINThefuseverificationprogramidentifiedfusesthatwereinadequatelysized.ThesediscrepancieswerenotedonTechnicalProblemReports(TPRs)andforwardedtoCorporateEngineeringforresolution.TheEngineeringevaluationofthefuseintheUnit2LowPressureCoolantInjection(LPCI)circuitrystatesthat,"thecurrentlyinstalled20Afuse,BussmannTypeMIN,inPanel902-32,providesadequateprotectionforthecircuit,"andthatthe"existinginstalled20Afuseprotectsthecircuit."Theevaluationalsoindicatedthatthefusemaynotcoordinatewiththeupstream30Acircuitbreaker.Nosafetysignificanceoroperabilityconcernswereattributedtothispotentiallackoffusecoordination.Engineeringdid,however,recommendreplacementofthefuse.WhentheevaluationarrivedatDresden,thefusecoordinatorprioritizedreplacementoftheLPCIfusecommensuratewithitslackofsafetysignificanceandoperabilityconcerns.Nospecificduedatewasassignedforthefusereplacement.Engineering'soperabilityassessmentofthefusesintheUnit2dieselgeneratorexcitationcabinetsrecommendednocompensatoryactionstoensureoperability(i.e.thesystemisoperablewiththecurrentlyinstalledfuses).Two30Afusesandone40AfusewereinstalledintheUnit2excitationcabinet,insteadofthe25Afusespresentedinthesystemdrawing.Theevaluationagainincludedarecommendationtoreplacethesubjectfuses.Itstatedthatduringanabnormalfaultcondition,thefusesmaynotprotecttheprimarywindingsofcontroltransformers.TherecommendationwasbasedonguidancefromGEBulletinGET-30396,"HowtoSelectanApplyPowerFuses,TypesEJ-1andEJ0-1."AnActionDueDateforfusereplacementofFebruary28,1993,wasassignedbyEngineering.Thereasoningbehindtheassignedduedatewasbasedupontheengineeringjudgmentthatanyexpectedfaultconditionthata25Afusecouldprotectagainstwouldalsobeprotectedbya30Aor40Afuse.ZNLD/2112/17
ATTACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECTIONREPORT50-237/92028,50-249/92028SinceidentificationofthedieselfusediscrepancyinApril,1992,DresdenStationhastakennumerousactionstoaddressEngineering'sfusereplacementrecommendation.Mostsignificantoftheseactionswasamoredetailedengineeringcalculationthatsupportedcontinuedoperationwiththecurrentlyinstalleddieselgeneratorfuses.Thiscalculationstatesthat"GE25A,30A,and40Afuses,TypeEJ0-1,willclearthefaultbeforeanydamageisdonetotheprimarywindtngsofthetransformerorthecircuit."ThisevaluationconfirmedEngineering'spreviousoperabilityassessmentandtheengineeringjudgmentofthefusecoordinator.DresdenStationbelievesthattheLPCIfuseswerenotreplacedpriortotheinspectionperiodbecausenosafetyoroperabilityconcernexistswiththecurrentlyinstalledfuse.Forthedieselgeneratorfuses,numerousactionsweretakentoreplaceandprocurethefusesandfuseclipspriortotheassignedActionDueDateofFebruary28,1993.Dresdendoesacknowledge,however,thatEngineering'srecommendationsshouldhavebeendispositionedinamoretimelymanner.Dresdenidentifiedtheneedforadditionaladministrativecontrolsforfusesidentifiedforreplacementunderthefuseupgradeprogram,ExaminationofthecurrentDresdenAdministrativeProcedure(DAP)11-27,"ControlandMaintenanceofFusesandtheFuseList,"indicatedthatitdidnotprovidedirectionfordispositioningofTPRsissuedpriortoOctober,1992.CRRETIVETEPTELTDTheUnit2LPCIfusewaschangedoutonFebruary19,1993.TheUnit3LPCIsystemhasalsobeeninspected.TheUnit3LPCIfusehasthecorrectamperage,butisaMIN-typefuseratherthantherecommendedKTN-typefuse.Whilenooperabilityconcernshavebeenraised,DresdenwillstillreplacetheUnit3LPCIfusethenexttimeLPCIisout-of-service.Forgoodengineeringpractice,theone40AdieselgeneratorfuseonUnit2willbereplacedwitha30AfusebyApril30,1993.ADocumentChangeRequestwassubmittedonFebruary19,1993toupdatetheamperageonallrelateddrawingsto30amps.ToaugmentadministrativecontrolsuntilDAP11-27isrevised,theModificationImplementationSup'ervisorhasissuedamemorandumtothefusecoordinatorincorporatingdirectionforfusereplacementsidentifiedinTechnicalProblemReportsissuedpriortoOctober,1992.ZNLD/2112/18
ATlACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECTIONREPORT50-237/92028,50-249/92028.RRECTIVETEPENTAVIDERVILATION:DAP11-27,willberevisedbyMarch31,1993,toincorporatetheinterimdirectionsdescribedintheabovememorandum.DATEOFFULLMPFullcompliancewasachievedwiththeissuanceamemorandumtothefusecoordinatorincorporatingdirectionforfusereplacementsidentifiedinTechnicalProblemReportsissuedpriortoOctober,1992.ZNLD/2112/19