IR 05000237/1992028

From kanterella
Jump to navigation Jump to search
Responds to Notice of Violations Noted in Insp Repts 50-237/92-28 & 50-249/92-28.Corective Actions:Identified Ground Has Cleared W/O Any Action by Station Personnel & Operations Personnel Were Counseled on Procedure Adherence
ML18037A087
Person / Time
Site: Dresden  Constellation icon.png
Issue date: 02/19/1993
From: FARRAR D
COMMONWEALTH EDISON CO.
To:
NRC
Shared Package
ML18037A086 List:
References
NUDOCS 9303240061
Download: ML18037A087 (14)


Text

'CommonwealthEdison1400OpusPlaceDownersGrove,Illinois60515February19,1993V.S.NuclearRegulatoryCommissionWashington,D.C.20555Attention;DocumentControlDeskSubject:Reference:DresdenNuclearPowerStationUnits2and3ResponsetoNoticeofViolationInspectionReport50-237/92028;50-249/92028NRCDocketNumbers50-237and50-249T.O.MartinlettertoL.O.Delseorge,datedJanuary20,1993,transmittinginspectionReport50-237/92028;50-249/92028EnclosedisCommonwealthEdisonCompany's(CECo)responsetotheNoticeofViolation{NOV)whichwastransmittedwiththereferencedletter.TheNOVcitedtwoSeverityLevelIVviolationsrequiringawrittenresponse.Theresponsetotheseviolationsisprovidedintheattachment,lfyourstaffhasanyquestionsorcommentsconcerningthisletter,pleasereferthemtoDeniseSaccomando,ComplianceEngineerat{708)663-7285.

Sincerely,c3.W~D.FarrarNuclearRegulatoryServicesManagerAttachmentcc:A.B.Davis,RegionalAdministrator-RegionIIIJ.Stand,ProjectManager-NRRM.N.Leach,SeniorResidentInspector-Dresden930324006i9303i8PDRADQCK050002378PDRZNLD/2112/13F<BSg199~

ArrACHMENTRESPONSETONOTlCEOFVIOLATlONNRCINSPECTlONREPORT50-237/92028,50-249/92028~gllj~2~72'I249%2I!2JULll10CFR50,AppendixB,CriterionV,requiresthatactivitiesaffectingqualityshallbeprescribedbydocumentinstructions,procedures,ordrawings,ofatypeappropriatetothecircumstancesandshallbeaccomplishedinaccordancewiththeseinstructions,procedures,ordrawings.kProcedureDOP6900-07,Revision9,"125VdcGroundDetections",requiredthattheprocedurebeimmediatelyperformedatDCsystemgroundsabove60Vdc,andaB1WorkRequestbesubmittedoncethegroundwaslocated.Furthermore,theprocedurerequired,atgroundsabove115Vdc,initiationofa14'aytimeclock(administrativeLimitingConditionforOperation{LCO))tolocateandremovethegroundandpreparationofaJustificationforContinuedOperation(JCO)ifthegroundcouldnotbelocatedorisolatedwithin14days.ProcedureDAP07-05,Revision9,"OperatingLogsandRecords",ParagraphB.5,requiredthatwhenaLCOentryoccurs,theeventmustbeloggedintheLCOLog.Contrarytotheabove:1.OnSeotember26,1992,whena125VdcsystemgroundwaspresentinUnit3,theLicenseefailedtoinitiateactionstolocateandremovetheground.Inaddition,theLicenseefailedtoinitiateanadministrativeLCOanddocumenttheeventintheLCOLog.2.OnNovember3,1992,when125VdcgroundswerepresentinbothUnits2and3,anadministrativeLCOwasinitiatedandloggedintheLCOLogforUnit3only.TheLicenseecouldnotprovideevidencethatactionsweretakentoidentifyandremovethegroundsineitherunit.3.OnNovember12,1992,whena125VdcgroundwaspresentinUnit3,thelicenseefailedtoinitiateactionstolocateandremovetheground.ZNLD/2112/14

ATIACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECTIONREPORT50-237/92028,50-249/92028NFTEVIO3A~QH;DresdenStationconcurswithitem1oftheviolationaswritten.DresdenStationproceduresprovideclearguidanceonrequiredactionsuponidentificationofdcgrounds.Itisclearthatpersonnelfailedtomeetmanagement'sexpectations.Investigationoftheeventsindicatedthatpersonnelfailedtofollowestablishedstationprocedures.WiththeissuanceoftheviolationDresdenStationinitiatedaninvestigationwhichrevealedthatstationdidtakeappropriateactionsonNovember3andNovember12thInregardtotheNovember3,1992,groundinvolvingUnit3(example2),actionwastakentoidentifyandremovetheground.TheUnit3Logentrystatesthatagroundcheckwasperformedat1857tloursfora-155Vgroundonthe125Ydcsystem.Thegroundwasidentifiedonbus3A-2circuitnumber16andWorkRequestD-13836waswrittenforinvestigationandrepairofthecircuit.ElectricalMaintenanceidentifiedandreplacedabrokenterminalblock.Furthertestingrevealedthattheauxiliarytransformer31fireprotectioncircuitwasgrounded.WorkRequest15077waswrittentoimplementrepairs.InregardtotheNovember3,1992,groundinvolvingUnit2(example2),actionwastakentoidentifyandremovetheground.WorkRequestD-13806waswrittenforinvestigationoftheground;however,thegroundclearedbeforeElectricalMaintenancepersonnelcouldbeginwork,TheUnit2groundwasnotdocumentedintheLCOLogsinceitneverreachedtherequired115volts,asspecifiedinDOP6900-06,125VdcGroundDetection".lnregardtotheNovember12,1992,groundinvolvinqUnit3(example3),actionwastakentolocateandremovetheground.TheUnitOperatorloggedthe-115Yground,thegroundchecking,andtheLCOintheUnitLogBook.Thegroundwaslocatedonbus3A-2.NoworkrequestwaswrittensinceWorkRequestsD-13836andD-15077werealreadyopentoinvestigatethegroundonbus3A-2.OnNovember16,1992,WorkRequestD-14129waswrittentodocumenta-90VgroundontheUnit3125Vdcsystem.ElectricalMaintenancepersonnelinvestiaatedandresolvedthegroundunderworkrequestsD-13836andD-15077.ThegroundwasmonitoreduntilJanuary2,1993,andneverreturned.DForexamole1,theidentifiedgroundhasclearedwithoutanyactionbystationpersonnel.OperationspersonnelinvolvedintheSeptember26,1992,eventwerecounseledbyOperations'sseniormanagementwithregardstotheimportanceofprocedureadherence.ZNLD/2112/15

ATIACHMENTRESPONSETONOTICEOFVIOLATIONNRGINSPECTIONREPORT50-237/92028,50-249/92028ETIVEEKTDEVITheOperationsManagerhasdiscussedfailuretofollowestablishedprocedureswiththeShiftEngineers.BeginningonFebruary10,1993,theShiftEngineerstailgatedwiththeirrespectivecrewstheimportanceoffollowingprocedures.Theywereremindedthatadherencetoproceduresisabasicexpectationandisrequiredtoensuresafe,reliableoperations.DATEFLLMPANEFullcompliancewasachievedwhentheindividualwascounseled.ZNLD/2112/16

'

ATlACHMENTRESPONSETONOTICEOFYIOLAllONNRCINSPECTIONREPORT50-237/92028,50-249/92028RE10CFR50,AppendixB,CriterionXVI,requiresthatmeasuresshallbeestablishedtoassurethatconditionsadversetoquality,suchasfailures,malfunctions,deficiencies,deviations,defectivematerialandequipment;andnonconformancearepromptlyidentifiedandcorrected.Contrarytotheabove,inFebruaryandApril1992,thelicenseeidentifiedoversizedfusesinvarioussafetyrelatedcircuitsincludingtheEmergencyDieselGeneratorexcitersandLowPressureCoolantcircuitry.AsofDecember,1992,thisconditionadversetoqualityhadnotbeencorrected.FRTEVIThefuseverificationprogramidentifiedfusesthatwereinadequatelysized.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-3039G,"HowtoSelectanApplyPowerFuses,TypesEJ-1andEJ0-1."AnActionDueDateforfusereplacementofFebruary28,1993,wasassignedbyEngineering.Thereasoningbehindtheassignedduedatewasbasedupontheengineeringjudgmentthatanyexpectedfaultconditionthata26Afusecouldprotectagainstwouldalsobeprotectedbya30Aor40Afuse.ZNLD/2112/17

'

ATIACHMENTRESPONSETONOTICEOFVIOLATIONNRCINSPECTIONREPORT50-237/92028,50-249/92028SinceidentificationofthedieselfusediscrepancyinApril,1992,DresdenStationhastakennumerousactionstoaddressEngineering'sfusereplacementrecommendation.Mostsignificantoftheseactionswasamoredetailedengineeringcalculationthatsupportedcontinuedoperationwiththecurrentlyinstalleddieselgeneratorfuses.Thiscalculationstatesthat"GE25A,30A,and40Afuses,TypeEJ0-1,willclearthefaultbeforeanydamageisdonetotheprimarywindingsofthetransformerorthecircuit."ThisevaluationconfirmedEngineering'spreviousoperabilityassessmentandtheengineeringjudgmentofthefusecoordnator.DresdenStationbelievesthattheLPCIfuseswerenotreplacedpriortotheinspectionperiodbecausenosafetyoroperabilityconcernexistswiththecurrentlyinstalledfuse.Forthedieselgeneratorfuses,numerousactionsweretakentoreplaceandprocurethefusesandfuseclipspriortotheassignedActionDueDateofFebruary28,1993.Dresdendoesacknowledge,however,thatEngineering'srecommendationsshouldhavebeendispositionedinamoretimelymanner.Dresdenidentifiedtheneedforadditionaladministrativecontrolsforfusesidentifiedforreplacementunderthefuseupgradeprogram.ExaminationofthecurrentDresdenAdministrativeProcedure(DAP)11-27,"ControlandMaintenanceofFusesandtheFuseList,"indicatedthatitdidnotprovidedirectionfordispositioningofTPRsissuedpriortoOctober,1992.RRTIVEPTEDEV0TheUnit2LPClfusewaschangedoutonFebruary19,1993.TheUnit3LPCIsystemhasalsobeeninspecte8.TheUnit3LPGIfusehasthecorrectamperage,butisaMIN-typefuseratherthantherecommendedKTN-typefuse.Whilenooperabilityconcernshavebeenraised,DresdenwillstillreplacetheUnit3LPCIfusethenexttimeLPCIisout-of-service.Forgoodengineeringpractice,theone40AdieselgeneratorfuseonUnit2willbereplacedwitha30AfusebyApril30,1993.ADocumentChangeRequestwassubmittedonFebruary19,1993toupdatetheamperageonallrelateddrawingsto30amps.ToaugmentadministrativecontrolsuntilDAP11-27isrevised,theModificationImplementationSupervisorhasissuedamemorandumtothefusecoordinatorincorporatingdirectionforfusereplacementsidentifiedinTechnicalProblemReportsissuedpriortoOctober,1992.ZNLD/2112/18

'

ATTACHMENTRESPONSETONOTICEOFVIOLATIONNRGINSPECTIONREPORT50-237/92028,50-249/92028RECTIYETEPKETVIDERDAP11-27,willberevisedbyMarch31,1993,toincorporatetheinterimdirectionsdescribedintheabovememorandum.DTEFLLPLINEFullcompliancewasachievedwiththeissuanceamemorandumtothefusecoordinatorincorporatingdirectionforfusereplacementsidentifiedinTechnicalProblemReportsissuedpriortoOctober,1992.ZNLD/2112/39