ML17263A225: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
Line 16: Line 16:


=Text=
=Text=
{{#Wiki_filter:ACCEI.EEDDOCUMENTDISOBVTIONSYSTEMREGULAORYINFORMATIONDISTRIBUT8SYSTEM(RIDS)ACCESSIONNBR:9304160043DOC.DATE:93/04/12NOTARIZED:NOFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterGAUTH.NAMEAUTHORAFFILIATIONBACKUSgWHERochesterGas&ElectricCorp.MECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONDOCKET05000244
{{#Wiki_filter:ACCEI.EEDDOCUMENTDISOBVTIONSYSTEMREGULAORYINFORMATION DISTRIBUT 8SYSTEM(RIDS)ACCESSION NBR:9304160043 DOC.DATE:
93/04/12NOTARIZED:
NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION BACKUSgWHERochester Gas&ElectricCorp.MECREDY,R.C.
Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION DOCKET05000244


==SUBJECT:==
==SUBJECT:==
LER93-001-00:on930312,bothsourcerangedetectorsfoundinoperableduringenergization.Causedbycenterelectrodedegradationduetogammacorrosion.Faileddetectorsreplacedw/qualifiedspares.W/930412ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRENCLSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),ncidentRpt,etc.NOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).05000244RECIPIENTIDCODE/NAMEPD1-3LAJOHNSONiAINTERNAL:ACNWAEOD/DSP/TPABNRR/DE/EELBNRR/DORS/OEABNRR/DRCH/HICBNRR/DRIL/RPEBRR7'DSSA/PLBGFILE02RGNE01EXTERNAL'G&GBRYCEgJ~HNRCPDRNSICPOOREiW.COPIESLTTRENCL1111221111111111111111221111RECIPIENTIDCODE/NAMEPD1-3PDAEOD/DOAAEOD/ROAB/DSPNRR/DE/EMEBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRSS/PRPBNRR/DSSA/SRXBRES/DSIR/EIBLSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL111122111111221111111111f'2374pQgc5NOTETOALL"RIDS"RECIPIENTS:$0-tPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPI-37(EXT.504-2065)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR30ENCL30  
LER93-001-00:on 930312,both sourcerangedetectors foundinoperable duringenergization.Caused bycenterelectrode degradation duetogammacorrosion.
Faileddetectors replacedw/qualified spares.W/930412 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTR ENCLSIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),ncidentRpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).
05000244RECIPIENT IDCODE/NAME PD1-3LAJOHNSONiA INTERNAL:
ACNWAEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB RR7'DSSA/
PLBGFILE02RGNE01EXTERNAL'G&GBRYCEgJ~HNRCPDRNSICPOOREiW.COPIESLTTRENCL1111221111111111111111221111RECIPIENT IDCODE/NAME PD1-3PDAEOD/DOAAEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB LSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL111122111111221111111111f'2374pQgc5NOTETOALL"RIDS"RECIPIENTS:
$0-tPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPI-37(EXT.504-2065)
TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:
LTTR30ENCL30  


JJrROCHESTERGASANDELECTRICCORPORATION,r'~".'rOarrtEt~jStJlf489EASTAVENUE,ROCHESTERN.K14649-0001ROBERTC.h1ECREDYVicePresidentCrnnJNucteJrProductionTELEPHONEAREACODE7i65462700April12,1993U.S.NuclearRegulatoryCommissionDocumentControlDeskNashington,DC20555
JJrROCHESTER GASANDELECTRICCORPORATION
,r'~".'rOarrtEt~jStJlf489EASTAVENUE,ROCHESTER N.K14649-0001 ROBERTC.h1ECREDYVicePresident CrnnJNucteJrProduction TELEPHONE AREACODE7i65462700April12,1993U.S.NuclearRegulatory Commission DocumentControlDeskNashington, DC20555


==Subject:==
==Subject:==
LER93-001,LossofSourceRangeDetectorIndicationDuringEnergization,DuetoFaultyDetectors,CausesaConditionProhibitedbyPlantTechnicalSpecifica-tions.R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"anyoperationprohibitedbytheplant'sTechnicalSpecifications",theattachedLicenseeEventReportLER93-001isherebysubmitted.Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,XCJRobertC.MeredyU.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaUSNRCSeniorResidentInspectorIGG030'9304160043930412PDRADOCK05000244S'PDR~'I>]gdIf  
LER93-001,LossofSourceRangeDetectorIndication DuringEnergization, DuetoFaultyDetectors, CausesaCondition Prohibited byPlantTechnical Specifica-tions.R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),
whichrequiresareportof,"anyoperation prohibited bytheplant'sTechnical Specifications",
theattachedLicenseeEventReportLER93-001isherebysubmitted.
Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,XCJRobertC.MeredyU.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaUSNRCSeniorResidentInspector IGG030'9304160043 930412PDRADOCK05000244S'PDR~'I>]gdIf  


NACFORM300(Se)9)US.NUCLEARREGULATORYCOMMISSIAPPAOVEDOMBNO.3)500(OCEXPIRF5:C/30/92ESTIMATEDBURDENPERRFSPONSETOCOMPLYWTHTHISINFORMATIOAICOLLKCTIONAEOUESTI50.0HAS.FORWARDCOMMENTSREGARDINGBUADENESTIMATETOTHERECORDSANDRFPORTSMANAGEMENTBRANCH(F030).U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON.DC20555,ANDTOTHEPAPEAWORKABDUCTIONPROiECT(31500'IOe).OFFICEOFMANAGEMENTANDBUDGET.WASHINGTON,DC20503.LICENSEEEVENTREPORT(LER)DOCKETNUMBER(2)PA'FACILITYNAME(1)R.E.GinnaNuclearPowerPlanto5ooo244ioFllTITLE(e)LossofSourceRangeDetectorIndicationDuringEnergization,DuetoFaultyDetectorsCausesaConditionProhibitedvTechnicalSnecificaio~yCC~'VENTDATE(SlLEANUMBER(0)REPORTDATE(7OTHERFACILITIESINVOLVED(0)MONTHOAYYEARYEARIg@SEQUENTIALNUMSERREVISIONMONTHOAYYEARFACILITYNAMESDOCKETNUMBFRISI050000312939300100041293~~05000OPERATINGMODE(0)NPOWERLEVELppp20.I02(0)20.e00(~)IIIIII20A05(el(1)(9)20.005(e)ll1(ill)20A054)ll)Grl20.405(~Ill)4)20.e05(~)BOM(c)(I)50.30(cl(2)50.73(eI(2IIII50.73(e)(2)IIII50.734)(2)(III)LICENSFECONTACTFOATHISLER(12)50,73leI(2)IIr)50.73(el(2)4l50.73(e)(2)lrQ)50.73(e)(2)(rljj)(A)50.73(el(2)(r(QI(~)50.73(e)(2)(el0THEREDUIREMENTSOF10CFR():(Checkonrormoreofthefo//owindi(11)THISREPORTISSUBMITTEDPURSUANTT73.71(III73.71(c)OTHERISptcifycnAtjttrectOrrowrot/lnyrrt,/j/RCForm300AINAMEWes1eyH.BackusTechnicalAssistanttotheOoerationsManaerTELEPHONENUMBERAREACODE315524-4446COMPLETEONELINEFOREACHCOMPONENTFAILUREOKSCRIBEDINTHISREPORTll3)CCAUSESYSTEMCOMPONENTMANUFAC.TURERREPORTABLETONPADSj~jPN~QQcAUsESYSTEMCOMPONENTMANUFAC.TURKREPOATABLE(cTONPRDSQtMY.'NUwY,IGDTW12pSUPPLEMKNTALREPORl'XPECTED(IC)EXPECTEDSUBMISSIONDATK(15)kklk)MI.QjtKiPyX~(MONTHOAYYEARYESIIIyrt,complrttEXPECTEDSt/der/SSIONDATEINOABSTRACTILlmlttoIrddtpecrt,I,r.,rppror/mrtrfyIifttenrindle.eptcrtyprwrittrn/inrdI10)OnMarch12,1993,at1425EST,viththereactorsubcriticalduringaplannedshutdown,bothsourcerangedetectorsverefoundinoperablewiththereactortripbreakersclosed.TheControlRoomoperatorsimmediatelyenteredandperformedtheapplicableactionsofequipmentrestorationprocedureER-NZSe1(SRMalfunction).Thereactortripbreakersvereopenedvithinfive(5)minutesoftheevent.Themostlikelycauseofthesourcerangedetectorfailureswascenterelectrodedegradationduetogammacorrosionofthebaretungstencenter~e"trode(centerwire).(ThiseventisNUREG--1022(B)causecode).Correctiveactionwastoreplacethefaileddetectorsvithqualifiedspares.CorrectiveactiontopreventrecurrenceisoutlinedinsectionV(B).NRCForm300(509)  
NACFORM300(Se)9)US.NUCLEARREGULATORY COMMISSIAPPAOVEDOMBNO.3)500(OCEXPIRF5:C/30/92ESTIMATED BURDENPERRFSPONSETOCOMPLYWTHTHISINFORMATIOAI COLLKCTION AEOUESTI50.0HAS.FORWARDCOMMENTSREGARDING BUADENESTIMATETOTHERECORDSANDRFPORTSMANAGEMENT BRANCH(F030).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.
DC20555,ANDTOTHEPAPEAWORK ABDUCTION PROiECT(31500'IOe).
OFFICEOFMANAGEMENT ANDBUDGET.WASHINGTON, DC20503.LICENSEEEVENTREPORT(LER)DOCKETNUMBER(2)PA'FACILITYNAME(1)R.E.GinnaNuclearPowerPlanto5ooo244ioFllTITLE(e)LossofSourceRangeDetectorIndication DuringEnergization, DuetoFaultyDetectors CausesaCondition Prohibited vTechnical Snecifica io~yCC~'VENTDATE(SlLEANUMBER(0)REPORTDATE(7OTHERFACILITIES INVOLVED(0)MONTHOAYYEARYEARIg@SEQUENTIAL NUMSERREVISIONMONTHOAYYEARFACILITYNAMESDOCKETNUMBFRISI 050000312939300100041293~~05000OPERATING MODE(0)NPOWERLEVELppp20.I02(0) 20.e00(~)IIIIII20A05(el(1)(9)20.005(e) ll1(ill)20A054)ll)Grl20.405(~Ill)4)20.e05(~)BOM(c)(I)50.30(cl(2) 50.73(eI(2IIII50.73(e)(2)IIII50.734)(2)(III)
LICENSFECONTACTFOATHISLER(12)50,73leI(2)IIr)50.73(el(2) 4l50.73(e)(2) lrQ)50.73(e)(2)(rljj)
(A)50.73(el(2)(r(QI(
~)50.73(e)(2)(el0THEREDUIREMENTS OF10CFR():(Checkonrormoreofthefo//owindi (11)THISREPORTISSUBMITTED PURSUANTT73.71(III 73.71(c)OTHERISptcifycnAtjttrect Orrowrot/lnyrrt,/j/RCForm300AINAMEWes1eyH.BackusTechnical Assistant totheOoerations ManaerTELEPHONE NUMBERAREACODE315524-4446COMPLETEONELINEFOREACHCOMPONENT FAILUREOKSCRIBED INTHISREPORTll3)CCAUSESYSTEMCOMPONENT MANUFAC.TURERREPORTABLE TONPADSj~jPN~QQcAUsESYSTEMCOMPONENT MANUFAC.TURKREPOATABLE (cTONPRDSQtMY.'NUwY,IGDTW12pSUPPLEMKNTAL REPORl'XPECTED (IC)EXPECTEDSUBMISSION DATK(15)kklk)MI.QjtKiPyX~(MONTHOAYYEARYESIIIyrt,complrttEXPECTEDSt/der/SSION DATEINOABSTRACTILlmlttoIrddtpecrt,I,r.,rppror/mrtrfy Iifttenrindle.eptcr typrwrittrn
/inrdI10)OnMarch12,1993,at1425EST,viththereactorsubcritical duringaplannedshutdown, bothsourcerangedetectors verefoundinoperable withthereactortripbreakersclosed.TheControlRoomoperators immediately enteredandperformed theapplicable actionsofequipment restoration procedure ER-NZSe1(SRMalfunction).
Thereactortripbreakersvereopenedvithinfive(5)minutesoftheevent.Themostlikelycauseofthesourcerangedetectorfailureswascenterelectrode degradation duetogammacorrosion ofthebaretungstencenter~e"trode(centerwire).(ThiseventisNUREG--1022(B)causecode).Corrective actionwastoreplacethefaileddetectors vithqualified spares.Corrective actiontopreventrecurrence isoutlinedinsectionV(B).NRCForm300(509)  


NRCFORM3SSA(649)US,NUCLEARREGULATORYCOMMISSIONLlCENSEEEVENTREPORT(LER)TEXTCONTINUATlONAPPROVEDOMBNO,3150010SEXPIRES:4/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYIYTHTHISINFORMATIONCOLLECTIONREOUEST:500HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(F430),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTOSHEPAPERWORKREDUCTIONPROJECT(31500)04),OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON.DC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(8)??oSEOUCNTIAL>5~REVrdr0N?.'/1/NUMddASP/r)NUMEAPAGE(3)R.E.GlnnaNuclearPowerPlantTEXT///mored/rdee/d//r/rer/ude/(r)roe/ir//ICForm3//S42/(12)osooo24493-0010002oFl1PRE-PMNTCONDITONSAplantshutdownwasinprogressperoperatingprocedure0-2.1(NormalShutdowntoHotShutdown)fortheannualrefuelingandmaintenanceoutage.Theturbinegeneratorhadgust.beentakenoffthelineandControlRoomoperators'wereintheprocessofshuttingthereactordownandinsertingallcontrolandshutdownrods.DESCRIPTIONOFEVENTDATESANDAPPROXIMATETIMESOFMAZOROCCURRENCESoMarch12,1993,1425EST:EventdateandtimeoMarch12,1993,1425,EST:EventdiscoverydateandtimeoMarch12,1993,1430EST:ControlRoomoperatorscompleteinsertingallcontrolandshutdownrodsandopenthereactortripbreakers.oMarch12,1993,1435EST:Plantstabilizedathotshutdown.oMarch12,1993,1501EST:SourceRangeNISN-31andNISN-32declaredinoperable.oMarch12,1993,1730EST:SourceRangeNISN-32declaredoperableusingtheinstalledsparesourcerangedetector.oMarch16,1993,1747EST:SourceRangeNISN-31declaredoperable.oMarch17,1993,2040EST:SourceRangeNISN-32declaredoperable,usingitsnormalsourcerangedetector.NRCPenn388A(589)  
NRCFORM3SSA(649)US,NUCLEARREGULATORY COMMISSION LlCENSEEEVENTREPORT(LER)TEXTCONTINUATlON APPROVEDOMBNO,3150010S EXPIRES:4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYIYTHTHISINFORMATION COLLECTION REOUEST:500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(F430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOSHEPAPERWORK REDUCTION PROJECT(31500)04),
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON.
DC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(8)??oSEOUCNTIAL
>5~REVrdr0N?.'/1/NUMddASP/r)NUMEAPAGE(3)R.E.GlnnaNuclearPowerPlantTEXT///mored/rdee/d//r/rer/ude/(r)roe/ir//IC Form3//S42/(12) osooo24493-0010002oFl1PRE-PMNTCONDITONSAplantshutdownwasinprogressperoperating procedure 0-2.1(NormalShutdowntoHotShutdown) fortheannualrefueling andmaintenance outage.Theturbinegenerator hadgust.beentakenoffthelineandControlRoomoperators
'wereintheprocessofshuttingthereactordownandinserting allcontrolandshutdownrods.DESCRIPTION OFEVENTDATESANDAPPROXIMATE TIMESOFMAZOROCCURRENCES oMarch12,1993,1425EST:EventdateandtimeoMarch12,1993,1425,EST:Eventdiscovery dateandtimeoMarch12,1993,1430EST:ControlRoomoperators completeinserting allcontrolandshutdownrodsandopenthereactortripbreakers.
oMarch12,1993,1435EST:Plantstabilized athotshutdown.
oMarch12,1993,1501EST:SourceRangeNISN-31andNISN-32declaredinoperable.
oMarch12,1993,1730EST:SourceRangeNISN-32declaredoperableusingtheinstalled sparesourcerangedetector.
oMarch16,1993,1747EST:SourceRangeNISN-31declaredoperable.
oMarch17,1993,2040EST:SourceRangeNISN-32declaredoperable, usingitsnormalsourcerangedetector.
NRCPenn388A(589)  


NRCFORM366A(689)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDOM6NO.31500106EXPIRES:6/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISLNFORMATIONCOLLECTIONREGUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATEToTHERECORDSANDREPORTSMANAGEMENTSRANCH(PJ)30).U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTO1HEPAPERWORKREDUCTIONPROJECT(3)500106),OFFICEOFMANAGEMENTANOBUDGET,WASHINGTON.DC20503.FACILITYNAME(I)DOCKETNUMBER(2)LERNUMBER(6)YEARO~>:SSOUSNTIAIv~4'EVISIONNVM66R'&-NUMFSAI'AGEI3)R.E.GinnaNuclearPaverPlantTEXTlllmototptcoitttquia/,uttAt//oont/P/RC%%dmt36SA't/(IT)0s0002~~93p010003DF11B.EVENT-OnMarch12,1993atapproximately1425ESTwiththereactorsubcriticalduringaplannedshutdown,sourcerange(SR)NuclearInstrumentationSystem(NIS)ChannelN-31andChannelN-32automaticallyenergizedatthenormalsetpointof</=5E-11ampsonthetwointermediaterange(IR)NISchannels.TheControl.Roomoperatorswerecloselymonitoringthedecayoftheintermediaterangecurrents,andwereanticipatingthe'resetlevelforthe.sourceranges.Atthetimeofautomaticenergizationofthesourcerangedetec-tors,therewasnocountrateindicationonChannelN-31orChannelN-32.Seeingnoindicationofcountrate,theControlRoomoperators,inaccordancewithplantproceduresandtrainingguidance,immediatelyattemptedtomanually.energizethesourcerangedetectorsusingtheP-6defeatpushbuttons.Thesourcerangedetectorsstilldidnotindicatecounts.TheControlRoomoperatorscontinuedtoexpeditiouslyinsertcontrolandshutdownrodsper0-2.1andatapproximately1430ESTthereactortripbreakerswereopened.Theplant,wassubsequentlystabilizedinhotshutdownatapproximately1435EST.NRCForm366A(649)  
NRCFORM366A(689)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOM6NO.31500106EXPIRES:6/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISLNFORMATION COLLECTION REGUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATEToTHERECORDSANDREPORTSMANAGEMENT SRANCH(PJ)30).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT(3)500106),
OFFICEOFMANAGEMENT ANOBUDGET,WASHINGTON.
DC20503.FACILITYNAME(I)DOCKETNUMBER(2)LERNUMBER(6)YEARO~>:SSOUSNTIAI v~4'EVISION NVM66R'&-NUMFSAI'AGEI3)R.E.GinnaNuclearPaverPlantTEXTlllmototptcoitttquia/,
uttAt//oont/P/RC%%dmt36SA't/(IT) 0s0002~~93p010003DF11B.EVENT-OnMarch12,1993atapproximately 1425ESTwiththereactorsubcritical duringaplannedshutdown, sourcerange(SR)NuclearInstrumentation System(NIS)ChannelN-31andChannelN-32automatically energized atthenormalsetpointof</=5E-11ampsonthetwointermediate range(IR)NISchannels.
TheControl.Roomoperators werecloselymonitoring thedecayoftheintermediate rangecurrents, andwereanticipating the'resetlevelforthe.sourceranges.Atthetimeofautomatic energization ofthesourcerangedetec-tors,therewasnocountrateindication onChannelN-31orChannelN-32.Seeingnoindication ofcountrate,theControlRoomoperators, inaccordance withplantprocedures andtrainingguidance, immediately attempted tomanually.energizethesourcerangedetectors usingtheP-6defeatpushbuttons.
Thesourcerangedetectors stilldidnotindicatecounts.TheControlRoomoperators continued toexpeditiously insertcontrolandshutdownrodsper0-2.1andatapproximately 1430ESTthereactortripbreakerswereopened.Theplant,was subsequently stabilized inhotshutdownatapproximately 1435EST.NRCForm366A(649)  


NRCFORM366A(64)9)US.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDOMBNO.3ISOOI04EXPIRESI4/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREOUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P4)30),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTOTHEPAPERWORKREDUCTIONPROJECT(31504)104).OFFICEOFMANAGEMFNTANDBUDGET,WASHINGTON,OC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(6)SEOUENZIAL,Oi)iNUMB%4AEVISIONNUMO64PAGE(3)R.E.GlnnaNuclearPowerPlantTEXT///mom4/>>ooJF~os,uood/d/ooo/NRCFomI35549/()7)osooo24493-00100040F~SubsequentlytheControlRoomoperatorsnotifiedhighersupervisionandtheInstrument&Control(I&C)Departmentoftheeventandatapproximately1501ESTdeclaredsourcerangeNISN-31andN-32inoperable.ThePlantOperationReviewCommittee(PORC)wasconvenedtoreviewtheactionstaken,conformancetoTechnicalSpecifications,eventclassificationandreportability.PORCdirectedthataccesstotheContainmentBuilding(CNMT)beprohibiteduntilonesourcerangechannelwasrestoredtooperablestatus.InadditionPORCconfirmedthatactionsweretakentoensureplantcooldownwouldnotoccur,andthatdilutionofboronconcentrationwouldnotoccur.TheControlRoomoperatorsenteredandperformedtheapplicableactionsofequipment,restorationprocedureER-NIS.1(SRMalfunction)includingcontinuedborationtogreaterthan54shutdownmargin.andsamplingtheReactorCoolantSystem(RCS).forboronconcentrationonaperiodicbasisduringtheboration.C.INOPERABLESTRUCTUEUKSFCOMPONENTS,ORSYSTEMSTHATCONTRIBUTEDTOTHE15TENT:D.None.OTE&RSYSTEMSORSECONDARYFUNCTIONSAFFECTED:None.EMETHODOPDISCOVERYTheeventwasimmediatelyapparentduetoindicationsintheControlRoom.NRCFoIm366A(64)9)  
NRCFORM366A(64)9)US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMBNO.3ISOOI04 EXPIRESI4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P4)30),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT(31504)104).
OFFICEOFMANAGEMFNT ANDBUDGET,WASHINGTON,OC 20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(6)SEOUENZIAL,Oi)i NUMB%4AEVISIONNUMO64PAGE(3)R.E.GlnnaNuclearPowerPlantTEXT///mom4/>>ooJF~os,uood/d/ooo/NRCFomI35549/()7)osooo24493-00100040F~Subsequently theControlRoomoperators notifiedhighersupervision andtheInstrument
&Control(I&C)Department oftheeventandatapproximately 1501ESTdeclaredsourcerangeNISN-31andN-32inoperable.
ThePlantOperation ReviewCommittee (PORC)wasconvenedtoreviewtheactionstaken,conformance toTechnical Specifications, eventclassification andreportability.
PORCdirectedthataccesstotheContainment Building(CNMT)beprohibited untilonesourcerangechannelwasrestoredtooperablestatus.InadditionPORCconfirmed thatactionsweretakentoensureplantcooldownwouldnotoccur,andthatdilutionofboronconcentration wouldnotoccur.TheControlRoomoperators enteredandperformed theapplicable actionsofequipment, restoration procedure ER-NIS.1(SRMalfunction) including continued borationtogreaterthan54shutdownmargin.andsamplingtheReactorCoolantSystem(RCS).forboronconcentration onaperiodicbasisduringtheboration.
C.INOPERABLE STRUCTUEUKSF COMPONENTS, ORSYSTEMSTHATCONTRIBUTED TOTHE15TENT:D.None.OTE&RSYSTEMSORSECONDARY FUNCTIONS AFFECTED:
None.EMETHODOPDISCOVERY Theeventwasimmediately apparentduetoindications intheControlRoom.NRCFoIm366A(64)9)  


NRCFORM366A(689)US.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION~APPROVEDOMBNO,315001065XPIRES:6/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFOAMATIONCOLLECTIONREQUEST:500HRS.FORWARDCOMMENTSREGARDINGBUAOENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P430),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON.DC20555,ANDTOTHEPAPERWORKREDUCTIONPROJECT(31500106).OFFICEOFMANAGEMENTANDBUDGET.WASHINGTON,OC20503.FACILITYNAMEn)DOCKETNUMBER(2)LERNUMBER(6)YEARLPNLSEQUENTIAI.+WC:REVISIONI+I:NUMEER4.'UMERPAGED))R.E.GinnaNuclearPoT6erPlantJEXT///6NKEEpecris>>6U9od.u>>>>M/6'one/N/ICForm35569)nl)osooo24493-010005OFPOPERATORACTIONTheControlRoomoperators,afterrecognizingthattherewerenoindicatedcountratesoneitherofthesourcerangedetectors,immediatelyattemptedtomanuallyenergizethe-sourcerangedetectorsusingtheP-6defeatpushbuttons.TheoperatorsenteredER-NIS.1andperformedtheapplicableactions,includingpullingthefusesforInstrumentPower,inanotherattempttoreinstate,thesource'anges.Subsequently,theControlRoomoperatorsnotifiedhighersupervision'andtheI&CDepartmentanddeclaredsourcerangeNISN-31andN-32inoperable.G.SAFETYSYSTEMRESPONSESNone.III.CAUSEOFOSTENTA.IMMEDIATECAUSEThecauseofthefailureofsourcerangedetectorsN-31andN-32toindicatecountswasdetectorfailureduetocenterelectrodedegradation.SpecificmeasurementsindicatethatthecenterelectrodetoshieldhadbecomeshortcircuitedonsourcerangedetectorN-31,most,likelyduetotheelectrodebreakingatthebottomofthedetector.SourcerangedetectorN-32wasfoundtobeopencircuited,possiblyduetotheelectrodebreakingatthetopofthedetector.NACForm366A(689)  
NRCFORM366A(689)US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION
~APPROVEDOMBNO,315001065XPIRES:6/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFOAMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING BUAOENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.
DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT(31500106).
OFFICEOFMANAGEMENT ANDBUDGET.WASHINGTON, OC20503.FACILITYNAMEn)DOCKETNUMBER(2)LERNUMBER(6)YEARLPNLSEQUENTIAI.
+WC:REVISIONI+I:NUMEER4.'UMERPAGED))R.E.GinnaNuclearPoT6erPlantJEXT///6NKEEpecris>>6U9od.
u>>>>M/6'one/N/IC Form35569)nl)osooo24493-010005OFPOPERATORACTIONTheControlRoomoperators, afterrecognizing thattherewerenoindicated countratesoneitherofthesourcerangedetectors, immediately attempted tomanuallyenergizethe-sourcerangedetectors usingtheP-6defeatpushbuttons.
Theoperators enteredER-NIS.1andperformed theapplicable actions,including pullingthefusesforInstrument Power,inanotherattempttoreinstate, thesource'anges.
Subsequently, theControlRoomoperators notifiedhighersupervision
'andtheI&CDepartment anddeclaredsourcerangeNISN-31andN-32inoperable.
G.SAFETYSYSTEMRESPONSES None.III.CAUSEOFOSTENTA.IMMEDIATE CAUSEThecauseofthefailureofsourcerangedetectors N-31andN-32toindicatecountswasdetectorfailureduetocenterelectrode degradation.
Specificmeasurements indicatethatthecenterelectrode toshieldhadbecomeshortcircuited onsourcerangedetectorN-31,most,likelyduetotheelectrode breakingatthebottomofthedetector.
SourcerangedetectorN-32wasfoundtobeopencircuited, possiblyduetotheelectrode breakingatthetopofthedetector.
NACForm366A(689)  


NRCFORM366AISS9)US.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDOMSNO.31600104EXPIRES:E/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREOUESTI603)HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCHIF@30),U,S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20655,ANDTO1HEPAPERWORKREDUCTIONPROJECT131600)04),OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,DC20603.FACILITYNAME11)DOCKETNUMBER12)YEARLERNUMBERIS)X6%SEOUENTIAI.NUMBERREVISIONNUMSERPAGE13)R.E.GonnaNuclearPowerPlantTEXTillmoroEPocolrrorlrr/rod,IrwoddldorM/ll/ICForrrr366AS/)17)osooo24493-0010006OFBROOTCAUSE:AfterconsultingwithWestinghouseElectricCorporation(themanufacturerandvendorforthesedetectors),itwasconcludedthattheunderlyingcauseofthecenterelectrodedegradationofsourcerangedetectorsN-31andN-32ismostlikelyduetogammacorrosionofthebaretungstencenterelectrode(centerwire).Thiseffectoccurswheneverthesourcerangedetectorisenergized.ANALYSISOpEVENTTheeventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"anyoperationprohibitedbytheplant'sTechnicalSpecification",inthatthefailureofsourcerangedetectorsN-31andN-32toindicatecountsat</=1E-10ampsonthetwointermediaterangeNISchannelswasanoperationprohibitedbytheplantTechnicalSpecificationsasfollows:oSpecification3.5.1.1states,"TheProtectionSystemInstrumentationshownonTable3.5-1shallbeoperablewhenevertheconditionsspecifiedinColumn6areexceeded".Forthesourcerangeinstruments,column6referstoNote2,whichstates,"Channelsshouldbeoperableatallmodesbelowthebypassconditionwiththereactortripsystembreakersintheclosedpositionandcontrolroddrivesystemcapableofrodwithdrawal".Contrarytotheabove,sourcerangechannelsN-31andN-32wereinoperablebelowthebypassconditionof</=1E-10onbothIRNISchannelswiththereactortripbreakersclosedandthecontrolroddrivesystemcapableofrodwithdrawal.Thisconditionexistedforapproximatelyfive(5)minutesuntilthereactortripbreakerswereopened.WhileanActionStatementexistsforonesourcedetectorinoperable,thereisnostatedactionrequirementfortwo,detectorsinoperablewiththeReactorTripbreakersclosed.Therefore,aconditionprohibitedbytheplant'sTechnicalSpecificationsexisted.NRCForm366A)689)  
NRCFORM366AISS9)US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMSNO.31600104EXPIRES:E/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI603)HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCHIF@30),U,S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20655,ANDTO1HEPAPERWORK REDUCTION PROJECT131600)04),
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20603.FACILITYNAME11)DOCKETNUMBER12)YEARLERNUMBERIS)X6%SEOUENTIAI.
NUMBERREVISIONNUMSERPAGE13)R.E.GonnaNuclearPowerPlantTEXTillmoroEPocolrrorlrr/rod, IrwoddldorM/ll/IC Forrrr366AS/)17) osooo24493-0010006OFBROOTCAUSE:Afterconsulting withWestinghouse ElectricCorporation (themanufacturer andvendorforthesedetectors),
itwasconcluded thattheunderlying causeofthecenterelectrode degradation ofsourcerangedetectors N-31andN-32ismostlikelyduetogammacorrosion ofthebaretungstencenterelectrode (centerwire).Thiseffectoccurswheneverthesourcerangedetectorisenergized.
ANALYSISOpEVENTTheeventisreportable inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),
whichrequiresareportof,"anyoperation prohibited bytheplant'sTechnical Specification",
inthatthefailureofsourcerangedetectors N-31andN-32toindicatecountsat</=1E-10ampsonthetwointermediate rangeNISchannelswasanoperation prohibited bytheplantTechnical Specifications asfollows:oSpecification 3.5.1.1states,"TheProtection SystemInstrumentation shownonTable3.5-1shallbeoperablewhenevertheconditions specified inColumn6areexceeded".
Forthesourcerangeinstruments, column6referstoNote2,whichstates,"Channels shouldbeoperableatallmodesbelowthebypasscondition withthereactortripsystembreakersintheclosedpositionandcontrolroddrivesystemcapableofrodwithdrawal".
Contrarytotheabove,sourcerangechannelsN-31andN-32wereinoperable belowthebypasscondition of</=1E-10onbothIRNISchannelswiththereactortripbreakersclosedandthecontrolroddrivesystemcapableofrodwithdrawal.
Thiscondition existedforapproximately five(5)minutesuntilthereactortripbreakerswereopened.WhileanActionStatement existsforonesourcedetectorinoperable, thereisnostatedactionrequirement fortwo,detectors inoperable withtheReactorTripbreakersclosed.Therefore, acondition prohibited bytheplant'sTechnical Specifications existed.NRCForm366A)689)  


NRCFORM366A(669)U.S.NUCLEARREGULATORYCOMMISSION2~LICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDOMBNO.3(600104EXPIRES:A/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREOUESTI500HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATEToTHERECORDSANDREPORTSMANAGEMENTBRANCH(P430),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTo1HEPAPERWORKREDUCTIONPROJECT(3150010I),OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,DC20503.FACILITYNAME(11DOCKETNUMBER(2)LERNUMBER(6)PAGE(3)R.E.GinnaNuclearPowerPlantTEXT/I/momH>>ce/t>>I)r/irer/Ir>>pr/r//I/orN/HRCForm366AB/(17)YEAR~rA0s00024493SEOUENTIALNUMSER001<~~REVISION..IH:NUMER00070F11Oncethetripbreakersareopen,theminimumoperablechannelsrequiredreducestoone(1)insteadoftwo(2)andtheactionstatementstatesinpartasfollows:Withthenumberofoperablechannelsonelessthantheminimumoperablechannelsrequirement,suspendalloperationsinvolvingpositivereactivitychanges.Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthiseventwiththefollowingresultsandconclusions:Thesafetysignificanceofthefailureofbothsourcerangechannelsisthelossofdetectionofsubcriticalneutronfluxinthecoreandthefunctionthosechannelsprovideforbothautomaticactuationofthereactorprotectionsystemandthepromptingofoperatoractiontoprotectshutdownmargin.However,thissignificanceisminimizedinthisinstanceforthefollowingreasons:0Thefailureoccurredcompletelywithinthesequenceofshuttingdownthe-reactorinaccordancewithplantprocedure0-2.1inthattheoperatorswerecloselymonitoringthedecayoftheintermediaterangecurrentsandwereanticipatingtheresetlevelforthesourceranges.lnaccordancewith0-2.1theoperatorswereex-peditiouslyinsertingthecontrolandshutdownrodstofivestepspriortomanuallyopeningthereactortripbreakers.Thissequence,simultaneouswithinjectingboricacidtoachievetherequiredRCScoldshutdownboronconcentrationinsuredthatshutdownmarginwasmaintainedgreaterthantherequirementsofTechnicalSpecifications,andthatshutdownmargindidnotdecreaseduringthisevent.NRCForm366A(BJ)9)
NRCFORM366A(669)U.S.NUCLEARREGULATORY COMMISSION 2~LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMBNO.3(600104EXPIRES:A/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATEToTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTo1HEPAPERWORK REDUCTION PROJECT(3150010I),
J NRCFORM355A(689)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEYENTREPORTILER)TEXTCONTINUATIONAPPROVEDOMBNO.31600104EXPIRES:4/30JS2ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUESTI50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P430),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTO1HEPAPERWORKREDUCTIONPROJECT(31504104).OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,OC20503.FACILITYNAME(1)DOCKETNUMBER(21LERNUMBER(5)YEAR(PSEQUENTIALS)I(REVISIONM3NUMSEA'P..:NUMBERPAGE(3)R.E.GinnaNuclearPowerPlantTEXTFITmo>>~JJ>>ookod,u>>aktJNealHRCAnn35543)(IT)osooo24493-0010008OioAfterimmediatelyrecognizingthatthesourcerangechannelsdidnotindicatecountsattheintermediaterangeresetpoint,theoperatorstookappropriateactionsinattempting-toreinstate-sourcerangedetectors.Theycontinuedtoexpeditiouslyinsertcontrolandshutdownrods,andwithinfiveminutes,openedthereactortripbreakers.Theoperatorcontinuedborationtothecoldshutdown,xenonfreeconcentrationrequiredbyprocedureforRCScooldownbelow500degrees.Therewasnodecreaseinshutdownmargin,fromthetime'offailureofbothsourcerangechannelsuntilthetimethesparesourcerangedetectorwasusedtodeclareChannelN-32operable.Alloperationsinvolvingpositivereactivitychangesweresuspendersuntilafterthesparesourcerangedetectorwasdeclaredoperable.Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.VCORRECTIVEACTIONAACTIONTAKENTORETURNAFFECTEDSYST1963TOPRE-EVENTNORMALSTATUS:0,ThedetectorinstalledinsourcerangechannelN-32wasdisconnectedandthepreviouslyinstalledsparesourcerangedetectorwasconnectedtosourcerangechannelN-32.NISN-32highvoltagesettingandthepulseheightdiscriminator(PHD)biassettingweread)ustedtoconformtothedataforthesparedetector.Atapproxi-mately1730ESTonMarch12,1993,sourcerangeChannelN-32wasdeclaredoperable.NRCForm365A(SSS)  
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503.FACILITYNAME(11DOCKETNUMBER(2)LERNUMBER(6)PAGE(3)R.E.GinnaNuclearPowerPlantTEXT/I/momH>>ce/t>>I)r/irer/
Ir>>pr/r//I/orN/HRC Form366AB/(17)YEAR~rA0s00024493SEOUENTIAL NUMSER001<~~REVISION..IH:NUMER00070F11Oncethetripbreakersareopen,theminimumoperablechannelsrequiredreducestoone(1)insteadoftwo(2)andtheactionstatement statesinpartasfollows:Withthenumberofoperablechannelsonelessthantheminimumoperablechannelsrequirement, suspendalloperations involving positivereactivity changes.Anassessment wasperformed considering boththesafetyconsequences andimplications ofthiseventwiththefollowing resultsandconclusions:
Thesafetysignificance ofthefailureofbothsourcerangechannelsisthelossofdetection ofsubcritical neutronfluxinthecoreandthefunctionthosechannelsprovideforbothautomatic actuation ofthereactorprotection systemandtheprompting ofoperatoractiontoprotectshutdownmargin.However,thissignificance isminimized inthisinstanceforthefollowing reasons:0Thefailureoccurredcompletely withinthesequenceofshuttingdownthe-reactor inaccordance withplantprocedure 0-2.1inthattheoperators werecloselymonitoring thedecayoftheintermediate rangecurrentsandwereanticipating theresetlevelforthesourceranges.lnaccordance with0-2.1theoperators wereex-peditiously inserting thecontrolandshutdownrodstofivestepspriortomanuallyopeningthereactortripbreakers.
Thissequence, simultaneous withinjecting boricacidtoachievetherequiredRCScoldshutdownboronconcentration insuredthatshutdownmarginwasmaintained greaterthantherequirements ofTechnical Specifications, andthatshutdownmargindidnotdecreaseduringthisevent.NRCForm366A(BJ)9)
J NRCFORM355A(689)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEYENTREPORTILER)TEXTCONTINUATION APPROVEDOMBNO.31600104EXPIRES:4/30JS2ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUESTI50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT(31504104).
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, OC20503.FACILITYNAME(1)DOCKETNUMBER(21LERNUMBER(5)YEAR(PSEQUENTIALS)I(REVISION M3NUMSEA'P..:NUMBERPAGE(3)R.E.GinnaNuclearPowerPlantTEXTFITmo>>~JJ>>ookod, u>>aktJNealHRCAnn35543)(IT)osooo24493-0010008OioAfterimmediately recognizing thatthesourcerangechannelsdidnotindicatecountsattheintermediate rangeresetpoint,theoperators tookappropriate actionsinattempting-toreinstate
-sourcerangedetectors.
Theycontinued toexpeditiously insertcontrolandshutdownrods,andwithinfiveminutes,openedthereactortripbreakers.
Theoperatorcontinued borationtothecoldshutdown, xenonfreeconcentration requiredbyprocedure forRCScooldownbelow500degrees.Therewasnodecreaseinshutdownmargin,fromthetime'offailureofbothsourcerangechannelsuntilthetimethesparesourcerangedetectorwasusedtodeclareChannelN-32operable.
Alloperations involving positivereactivity changesweresuspenders untilafterthesparesourcerangedetectorwasdeclaredoperable.
Basedontheabove,itcanbeconcluded thatthepublic'shealthandsafetywasassuredatalltimes.VCORRECTIVE ACTIONAACTIONTAKENTORETURNAFFECTEDSYST1963TOPRE-EVENT NORMALSTATUS:0,Thedetectorinstalled insourcerangechannelN-32wasdisconnected andthepreviously installed sparesourcerangedetectorwasconnected tosourcerangechannelN-32.NISN-32highvoltagesettingandthepulseheightdiscriminator (PHD)biassettingweread)ustedtoconformtothedataforthesparedetector.
Atapproxi-mately1730ESTonMarch12,1993,sourcerangeChannelN-32wasdeclaredoperable.
NRCForm365A(SSS)  


NRCFORM366A(669)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVED0MBNO.31500)04EXPIRES:6/30)92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST:500HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P630),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,OC20555,ANDTO1'HEPAPERWORKREDUCTIONPROJECT(31500106),OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,DC20503,FACILITYNAME(I)DOCKETNUMBER(2)LERNUMBER(6)YEARS~ySEQVSNTIAL:~2NUMSSIIREVISIONNUMSAPAGE(3)R.E.GonnaNuclearPowerPlantTEXTNmonJIMcels~,VJP~HRCForm35663)(IT)ppppp24430010009oF11ThedetectorinstalledinsourcerangechannelN-31wasreplacedwithadetectorwithdrawnfromstock.Subsequently,forsourcerangechannelN-31thehighvoltagepowersupplywasreplaced.Thedetectoranodevoltagecurve(alsoreferredtoastheplateaucurve).wasobtained,andthePHDbiassettingwasadjusted.Atapproximately1747ESTonMarch16,1993,sourcerangeChannelN-31wasdeclaredoperable.oThedetectorinstalledinsourcerangechannelN-32wasreplacedwithadetectorwithdrawnfromstock.Forthisnewlyinstalleddetector,theplateaucurvewasobtainedandthePHDbiassettingwasadjusted.TheinstalledsparesourcerangedetectorwasthendisconnectedfromsourcerangechannelN-32andthisnewlyinstalledsourcerangedetectorwasconnectedtosourcerangechannelN-32..Thechanneloperabilitytestwascompleted,andatapproximately2040ESTonMarch17,1993sourcerangeChannelN-32wasdeclaredoperable,usingitsnormalsourcerangedetector.BACTIONTAKENORPLANN19)TONUGENTREC&tRENCE:Tominimizefuturesourcerangedetectorfailures,thefollowingactionsarebeingplanned:0AperiodicreplacementintervalforBF~filledsourcerangedetectorswillbeestablished,basedupontimeinserviceornumberofener-gizationsofthedetectors.NRCForm366A(689)  
NRCFORM366A(669)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVED0MBNO.31500)04EXPIRES:6/30)92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P630),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, OC20555,ANDTO1'HEPAPERWORK REDUCTION PROJECT(31500106),
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503,FACILITYNAME(I)DOCKETNUMBER(2)LERNUMBER(6)YEARS~ySEQVSNTIAL
:~2NUMSSIIREVISIONNUMSAPAGE(3)R.E.GonnaNuclearPowerPlantTEXTNmonJIMcels~,VJP~HRCForm35663)(IT)ppppp24430010009oF11Thedetectorinstalled insourcerangechannelN-31wasreplacedwithadetectorwithdrawn fromstock.Subsequently, forsourcerangechannelN-31thehighvoltagepowersupplywasreplaced.
Thedetectoranodevoltagecurve(alsoreferredtoastheplateaucurve).wasobtained, andthePHDbiassettingwasadjusted.
Atapproximately 1747ESTonMarch16,1993,sourcerangeChannelN-31wasdeclaredoperable.
oThedetectorinstalled insourcerangechannelN-32wasreplacedwithadetectorwithdrawn fromstock.Forthisnewlyinstalled
: detector, theplateaucurvewasobtainedandthePHDbiassettingwasadjusted.
Theinstalled sparesourcerangedetectorwasthendisconnected fromsourcerangechannelN-32andthisnewlyinstalled sourcerangedetectorwasconnected tosourcerangechannelN-32..Thechanneloperability testwascompleted, andatapproximately 2040ESTonMarch17,1993sourcerangeChannelN-32wasdeclaredoperable, usingitsnormalsourcerangedetector.
BACTIONTAKENORPLANN19)TONUGENTREC&tRENCE:
Tominimizefuturesourcerangedetectorfailures, thefollowing actionsarebeingplanned:0Aperiodicreplacement intervalforBF~filledsourcerangedetectors willbeestablished, basedupontimeinserviceornumberofener-gizations ofthedetectors.
NRCForm366A(689)  


NRCFORM366A(689)FACILITYNAME(1)UE.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORTtLER)TEXTCONTINUATIONDOCKETNUMBER(2)APPROVEDOM8NO.31600104EXPIRES:4/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST:50/)HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P830),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTOTHEPAPERWORKREDUCTIONPROJECT(31500104).OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,DC20503.PAGE(3)LERNUMBER(8)YEARP444SEQUENTIAL.AyNUMSERREVISIONNUMSSRR.E.GonnaNuclearPowerPlaneTEXT///mareS>>ceJIre/Ir/red,Ireeedd/dar>>/N/IC%%drm38642/((7)psppp244930010010OFoAnewWestinghousedesignfortheseBF3filledsourcerangedetectorsincorporateslowvoltagesourcerangedetectorswithgold-platedtungstencenterwireconductormaterial.Detectorsofthisnewdesignwillbeprocured.Whendetectorsofthisnewdesignareinstalled,aspartofaplanneddetectorupgradeschedule,asreplace-mentsforexistingdetectors,theperiodicreplacementintervalwillbere-evaluated.0Existingcalibrationprocedureswillberevised,"ornewproceduresdeveloped,toincludestepstoperformtimedomainreflectometry(TDR)measure-mentsonN-31,N-32andsparedetector,priortoscheduledrefuelingoutages.(TDRmeasurementscandetermineifthedetectorcenterelectrodewireisbroken,shortedoutorifithashighorlowresistance).0Atrendingprogramtodetectpotentialdegradationofsourcerangedetectorswillbeestablished,forthefollowingdata:1)Detectorplateaucurvedatawillbetrended.AstheBF3gasinthedetectordissociatesovertime,thehighvoltagewillbeadjustedhighereachtimeuntilitcannolongerbesetontheplateau.2)PHDbiascurveswillbetrended.RMATONAPAXLEDCOMPONENTS:ThefaultydetectorswereBF3filled,sourcerangedetectorproportionalcounters,PartNo.WL-24182manufacturedbyWestinghouseElectricCorporation.NRCForm388A(889)  
NRCFORM366A(689)FACILITYNAME(1)UE.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORTtLER)TEXTCONTINUATION DOCKETNUMBER(2)APPROVEDOM8NO.31600104EXPIRES:4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:50/)HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P830),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT(31500104).
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503.PAGE(3)LERNUMBER(8)YEARP444SEQUENTIAL
.AyNUMSERREVISIONNUMSSRR.E.GonnaNuclearPowerPlaneTEXT///mareS>>ceJIre/Ir/red, Ireeedd/dar>>/N/IC
%%drm38642/((7)psppp244930010010OFoAnewWestinghouse designfortheseBF3filledsourcerangedetectors incorporates lowvoltagesourcerangedetectors withgold-plated tungstencenterwireconductor material.
Detectors ofthisnewdesignwillbeprocured.
Whendetectors ofthisnewdesignareinstalled, aspartofaplanneddetectorupgradeschedule, asreplace-mentsforexistingdetectors, theperiodicreplacement intervalwillbere-evaluated.
0Existingcalibration procedures willberevised,"ornewprocedures developed, toincludestepstoperformtimedomainreflectometry (TDR)measure-mentsonN-31,N-32andsparedetector, priortoscheduled refueling outages.(TDRmeasurements candetermine ifthedetectorcenterelectrode wireisbroken,shortedoutorifithashighorlowresistance)
.0Atrendingprogramtodetectpotential degradation ofsourcerangedetectors willbeestablished, forthefollowing data:1)Detectorplateaucurvedatawillbetrended.AstheBF3gasinthedetectordissociates overtime,thehighvoltagewillbeadjustedhighereachtimeuntilitcannolongerbesetontheplateau.2)PHDbiascurveswillbetrended.RMATONAPAXLEDCOMPONENTS:
Thefaultydetectors wereBF3filled,sourcerangedetectorproportional
: counters, PartNo.WL-24182manufactured byWestinghouse ElectricCorporation.
NRCForm388A(889)  


NRCFORM366A(SJ)9)tUS.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEOOMBNO,31500104EXPIRES:EI30(92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST:500HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(F430).U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON.OC20555,ANDTO1HEPAPERWORKREDUCTIONPROJECT(31500104).OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,DC20503.FACILITYNAME(1IDOCKETNUMBER(2)YEARLERNUMBER(SISEQUENTIALNVMSERREVISIONNVMSERI'AGE(3)R.E.GinnaNuclearPowerPlantRJOOOOPooo(ssoSs(INLgoooddlooIMIHRC%%dmI36643)(17)osooo244930010011OFB.PREVXOUSLERsONSIMILARKGFNTS.AsimilarLEReventhistoricalsearchwasconductedwiththefollowingresults:LER90-003(HigherThanNormalCountRateonSourceRangeNIS,DuetoaFaultyDetector,CausesaReactorTripDuringSourceRangeRe-energization)wasasimilareventwiththesamerootcause.Thecorrectiveactiontopreventrecur-rence,oftheeventdescribedinLER90-003,wastoinitiateaevaluationwhichwillultimatelyresultinprocurementandinstallationofdetectors,ofanewWestinghousedesign.Itshouldbenotedthateveniftheevaluationhadbeencompleted,anddetectorsofanewdesignhadbeenprocuredandwereinstock,thesedetectorswouldnothavebeeninstalledpriortothe1993outage.CSPECIALCOMMENTSNone.NRCFoIm366A(SJ)9)}}
NRCFORM366A(SJ)9)tUS.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEOOMBNO,31500104EXPIRES:EI30(92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(F430).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.
OC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT(31500104).
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503.FACILITYNAME(1IDOCKETNUMBER(2)YEARLERNUMBER(SISEQUENTIAL NVMSERREVISIONNVMSERI'AGE(3)R.E.GinnaNuclearPowerPlantRJOOOOPooo (ssoSs(INL goooddlooIMI HRC%%dmI36643)(17)osooo244930010011OFB.PREVXOUSLERsONSIMILARKGFNTS.AsimilarLEReventhistorical searchwasconducted withthefollowing results:LER90-003(HigherThanNormalCountRateonSourceRangeNIS,DuetoaFaultyDetector, CausesaReactorTripDuringSourceRangeRe-energization) wasasimilareventwiththesamerootcause.Thecorrective actiontopreventrecur-rence,oftheeventdescribed inLER90-003,wastoinitiateaevaluation whichwillultimately resultinprocurement andinstallation ofdetectors, ofanewWestinghouse design.Itshouldbenotedthateveniftheevaluation hadbeencompleted, anddetectors ofanewdesignhadbeenprocuredandwereinstock,thesedetectors wouldnothavebeeninstalled priortothe1993outage.CSPECIALCOMMENTSNone.NRCFoIm366A(SJ)9)}}

Revision as of 13:02, 29 June 2018

LER 93-001-00:on 930312,both Source Range Detectors Found Inoperable During Energization.Caused by Center Electrode Degradation Due to Gamma Corrosion.Failed Detectors Replaced W/Qualified spares.W/930412 Ltr
ML17263A225
Person / Time
Site: Ginna Constellation icon.png
Issue date: 04/12/1993
From: BACKUS W H, MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-93-001, LER-93-1, NUDOCS 9304160043
Download: ML17263A225 (26)
v • d • e


Text

ACCEI.EEDDOCUMENTDISOBVTIONSYSTEMREGULAORYINFORMATION DISTRIBUT 8SYSTEM(RIDS)ACCESSION NBR:9304160043 DOC.DATE:

93/04/12NOTARIZED:

NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION BACKUSgWHERochester Gas&ElectricCorp.MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION DOCKET05000244

SUBJECT:

LER93-001-00:on 930312,both sourcerangedetectors foundinoperable duringenergization.Caused bycenterelectrode degradation duetogammacorrosion.

Faileddetectors replacedw/qualified spares.W/930412 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTR ENCLSIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),ncidentRpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

05000244RECIPIENT IDCODE/NAME PD1-3LAJOHNSONiA INTERNAL:

ACNWAEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB RR7'DSSA/

PLBGFILE02RGNE01EXTERNAL'G&GBRYCEgJ~HNRCPDRNSICPOOREiW.COPIESLTTRENCL1111221111111111111111221111RECIPIENT IDCODE/NAME PD1-3PDAEOD/DOAAEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB LSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL111122111111221111111111f'2374pQgc5NOTETOALL"RIDS"RECIPIENTS:

$0-tPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPI-37(EXT.504-2065)

TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR30ENCL30

JJrROCHESTER GASANDELECTRICCORPORATION

,r'~".'rOarrtEt~jStJlf489EASTAVENUE,ROCHESTER N.K14649-0001 ROBERTC.h1ECREDYVicePresident CrnnJNucteJrProduction TELEPHONE AREACODE7i65462700April12,1993U.S.NuclearRegulatory Commission DocumentControlDeskNashington, DC20555

Subject:

LER93-001,LossofSourceRangeDetectorIndication DuringEnergization, DuetoFaultyDetectors, CausesaCondition Prohibited byPlantTechnical Specifica-tions.R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),

whichrequiresareportof,"anyoperation prohibited bytheplant'sTechnical Specifications",

theattachedLicenseeEventReportLER93-001isherebysubmitted.

Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,XCJRobertC.MeredyU.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaUSNRCSeniorResidentInspector IGG030'9304160043 930412PDRADOCK05000244S'PDR~'I>]gdIf

NACFORM300(Se)9)US.NUCLEARREGULATORY COMMISSIAPPAOVEDOMBNO.3)500(OCEXPIRF5:C/30/92ESTIMATED BURDENPERRFSPONSETOCOMPLYWTHTHISINFORMATIOAI COLLKCTION AEOUESTI50.0HAS.FORWARDCOMMENTSREGARDING BUADENESTIMATETOTHERECORDSANDRFPORTSMANAGEMENT BRANCH(F030).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.

DC20555,ANDTOTHEPAPEAWORK ABDUCTION PROiECT(31500'IOe).

OFFICEOFMANAGEMENT ANDBUDGET.WASHINGTON, DC20503.LICENSEEEVENTREPORT(LER)DOCKETNUMBER(2)PA'FACILITYNAME(1)R.E.GinnaNuclearPowerPlanto5ooo244ioFllTITLE(e)LossofSourceRangeDetectorIndication DuringEnergization, DuetoFaultyDetectors CausesaCondition Prohibited vTechnical Snecifica io~yCC~'VENTDATE(SlLEANUMBER(0)REPORTDATE(7OTHERFACILITIES INVOLVED(0)MONTHOAYYEARYEARIg@SEQUENTIAL NUMSERREVISIONMONTHOAYYEARFACILITYNAMESDOCKETNUMBFRISI 050000312939300100041293~~05000OPERATING MODE(0)NPOWERLEVELppp20.I02(0) 20.e00(~)IIIIII20A05(el(1)(9)20.005(e) ll1(ill)20A054)ll)Grl20.405(~Ill)4)20.e05(~)BOM(c)(I)50.30(cl(2) 50.73(eI(2IIII50.73(e)(2)IIII50.734)(2)(III)

LICENSFECONTACTFOATHISLER(12)50,73leI(2)IIr)50.73(el(2) 4l50.73(e)(2) lrQ)50.73(e)(2)(rljj)

(A)50.73(el(2)(r(QI(

~)50.73(e)(2)(el0THEREDUIREMENTS OF10CFR():(Checkonrormoreofthefo//owindi (11)THISREPORTISSUBMITTED PURSUANTT73.71(III 73.71(c)OTHERISptcifycnAtjttrect Orrowrot/lnyrrt,/j/RCForm300AINAMEWes1eyH.BackusTechnical Assistant totheOoerations ManaerTELEPHONE NUMBERAREACODE315524-4446COMPLETEONELINEFOREACHCOMPONENT FAILUREOKSCRIBED INTHISREPORTll3)CCAUSESYSTEMCOMPONENT MANUFAC.TURERREPORTABLE TONPADSj~jPN~QQcAUsESYSTEMCOMPONENT MANUFAC.TURKREPOATABLE (cTONPRDSQtMY.'NUwY,IGDTW12pSUPPLEMKNTAL REPORl'XPECTED (IC)EXPECTEDSUBMISSION DATK(15)kklk)MI.QjtKiPyX~(MONTHOAYYEARYESIIIyrt,complrttEXPECTEDSt/der/SSION DATEINOABSTRACTILlmlttoIrddtpecrt,I,r.,rppror/mrtrfy Iifttenrindle.eptcr typrwrittrn

/inrdI10)OnMarch12,1993,at1425EST,viththereactorsubcritical duringaplannedshutdown, bothsourcerangedetectors verefoundinoperable withthereactortripbreakersclosed.TheControlRoomoperators immediately enteredandperformed theapplicable actionsofequipment restoration procedure ER-NZSe1(SRMalfunction).

Thereactortripbreakersvereopenedvithinfive(5)minutesoftheevent.Themostlikelycauseofthesourcerangedetectorfailureswascenterelectrode degradation duetogammacorrosion ofthebaretungstencenter~e"trode(centerwire).(ThiseventisNUREG--1022(B)causecode).Corrective actionwastoreplacethefaileddetectors vithqualified spares.Corrective actiontopreventrecurrence isoutlinedinsectionV(B).NRCForm300(509)

NRCFORM3SSA(649)US,NUCLEARREGULATORY COMMISSION LlCENSEEEVENTREPORT(LER)TEXTCONTINUATlON APPROVEDOMBNO,3150010S EXPIRES:4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYIYTHTHISINFORMATION COLLECTION REOUEST:500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(F430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOSHEPAPERWORK REDUCTION PROJECT(31500)04),

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON.

DC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(8)??oSEOUCNTIAL

>5~REVrdr0N?.'/1/NUMddASP/r)NUMEAPAGE(3)R.E.GlnnaNuclearPowerPlantTEXT///mored/rdee/d//r/rer/ude/(r)roe/ir//IC Form3//S42/(12) osooo24493-0010002oFl1PRE-PMNTCONDITONSAplantshutdownwasinprogressperoperating procedure 0-2.1(NormalShutdowntoHotShutdown) fortheannualrefueling andmaintenance outage.Theturbinegenerator hadgust.beentakenoffthelineandControlRoomoperators

'wereintheprocessofshuttingthereactordownandinserting allcontrolandshutdownrods.DESCRIPTION OFEVENTDATESANDAPPROXIMATE TIMESOFMAZOROCCURRENCES oMarch12,1993,1425EST:EventdateandtimeoMarch12,1993,1425,EST:Eventdiscovery dateandtimeoMarch12,1993,1430EST:ControlRoomoperators completeinserting allcontrolandshutdownrodsandopenthereactortripbreakers.

oMarch12,1993,1435EST:Plantstabilized athotshutdown.

oMarch12,1993,1501EST:SourceRangeNISN-31andNISN-32declaredinoperable.

oMarch12,1993,1730EST:SourceRangeNISN-32declaredoperableusingtheinstalled sparesourcerangedetector.

oMarch16,1993,1747EST:SourceRangeNISN-31declaredoperable.

oMarch17,1993,2040EST:SourceRangeNISN-32declaredoperable, usingitsnormalsourcerangedetector.

NRCPenn388A(589)

NRCFORM366A(689)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOM6NO.31500106EXPIRES:6/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISLNFORMATION COLLECTION REGUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATEToTHERECORDSANDREPORTSMANAGEMENT SRANCH(PJ)30).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT(3)500106),

OFFICEOFMANAGEMENT ANOBUDGET,WASHINGTON.

DC20503.FACILITYNAME(I)DOCKETNUMBER(2)LERNUMBER(6)YEARO~>:SSOUSNTIAI v~4'EVISION NVM66R'&-NUMFSAI'AGEI3)R.E.GinnaNuclearPaverPlantTEXTlllmototptcoitttquia/,

uttAt//oont/P/RC%%dmt36SA't/(IT) 0s0002~~93p010003DF11B.EVENT-OnMarch12,1993atapproximately 1425ESTwiththereactorsubcritical duringaplannedshutdown, sourcerange(SR)NuclearInstrumentation System(NIS)ChannelN-31andChannelN-32automatically energized atthenormalsetpointof</=5E-11ampsonthetwointermediate range(IR)NISchannels.

TheControl.Roomoperators werecloselymonitoring thedecayoftheintermediate rangecurrents, andwereanticipating the'resetlevelforthe.sourceranges.Atthetimeofautomatic energization ofthesourcerangedetec-tors,therewasnocountrateindication onChannelN-31orChannelN-32.Seeingnoindication ofcountrate,theControlRoomoperators, inaccordance withplantprocedures andtrainingguidance, immediately attempted tomanually.energizethesourcerangedetectors usingtheP-6defeatpushbuttons.

Thesourcerangedetectors stilldidnotindicatecounts.TheControlRoomoperators continued toexpeditiously insertcontrolandshutdownrodsper0-2.1andatapproximately 1430ESTthereactortripbreakerswereopened.Theplant,was subsequently stabilized inhotshutdownatapproximately 1435EST.NRCForm366A(649)

NRCFORM366A(64)9)US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMBNO.3ISOOI04 EXPIRESI4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P4)30),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT(31504)104).

OFFICEOFMANAGEMFNT ANDBUDGET,WASHINGTON,OC 20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(6)SEOUENZIAL,Oi)i NUMB%4AEVISIONNUMO64PAGE(3)R.E.GlnnaNuclearPowerPlantTEXT///mom4/>>ooJF~os,uood/d/ooo/NRCFomI35549/()7)osooo24493-00100040F~Subsequently theControlRoomoperators notifiedhighersupervision andtheInstrument

&Control(I&C)Department oftheeventandatapproximately 1501ESTdeclaredsourcerangeNISN-31andN-32inoperable.

ThePlantOperation ReviewCommittee (PORC)wasconvenedtoreviewtheactionstaken,conformance toTechnical Specifications, eventclassification andreportability.

PORCdirectedthataccesstotheContainment Building(CNMT)beprohibited untilonesourcerangechannelwasrestoredtooperablestatus.InadditionPORCconfirmed thatactionsweretakentoensureplantcooldownwouldnotoccur,andthatdilutionofboronconcentration wouldnotoccur.TheControlRoomoperators enteredandperformed theapplicable actionsofequipment, restoration procedure ER-NIS.1(SRMalfunction) including continued borationtogreaterthan54shutdownmargin.andsamplingtheReactorCoolantSystem(RCS).forboronconcentration onaperiodicbasisduringtheboration.

C.INOPERABLE STRUCTUEUKSF COMPONENTS, ORSYSTEMSTHATCONTRIBUTED TOTHE15TENT:D.None.OTE&RSYSTEMSORSECONDARY FUNCTIONS AFFECTED:

None.EMETHODOPDISCOVERY Theeventwasimmediately apparentduetoindications intheControlRoom.NRCFoIm366A(64)9)

NRCFORM366A(689)US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION

~APPROVEDOMBNO,315001065XPIRES:6/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFOAMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING BUAOENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.

DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT(31500106).

OFFICEOFMANAGEMENT ANDBUDGET.WASHINGTON, OC20503.FACILITYNAMEn)DOCKETNUMBER(2)LERNUMBER(6)YEARLPNLSEQUENTIAI.

+WC:REVISIONI+I:NUMEER4.'UMERPAGED))R.E.GinnaNuclearPoT6erPlantJEXT///6NKEEpecris>>6U9od.

u>>>>M/6'one/N/IC Form35569)nl)osooo24493-010005OFPOPERATORACTIONTheControlRoomoperators, afterrecognizing thattherewerenoindicated countratesoneitherofthesourcerangedetectors, immediately attempted tomanuallyenergizethe-sourcerangedetectors usingtheP-6defeatpushbuttons.

Theoperators enteredER-NIS.1andperformed theapplicable actions,including pullingthefusesforInstrument Power,inanotherattempttoreinstate, thesource'anges.

Subsequently, theControlRoomoperators notifiedhighersupervision

'andtheI&CDepartment anddeclaredsourcerangeNISN-31andN-32inoperable.

G.SAFETYSYSTEMRESPONSES None.III.CAUSEOFOSTENTA.IMMEDIATE CAUSEThecauseofthefailureofsourcerangedetectors N-31andN-32toindicatecountswasdetectorfailureduetocenterelectrode degradation.

Specificmeasurements indicatethatthecenterelectrode toshieldhadbecomeshortcircuited onsourcerangedetectorN-31,most,likelyduetotheelectrode breakingatthebottomofthedetector.

SourcerangedetectorN-32wasfoundtobeopencircuited, possiblyduetotheelectrode breakingatthetopofthedetector.

NACForm366A(689)

NRCFORM366AISS9)US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMSNO.31600104EXPIRES:E/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI603)HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCHIF@30),U,S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20655,ANDTO1HEPAPERWORK REDUCTION PROJECT131600)04),

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20603.FACILITYNAME11)DOCKETNUMBER12)YEARLERNUMBERIS)X6%SEOUENTIAI.

NUMBERREVISIONNUMSERPAGE13)R.E.GonnaNuclearPowerPlantTEXTillmoroEPocolrrorlrr/rod, IrwoddldorM/ll/IC Forrrr366AS/)17) osooo24493-0010006OFBROOTCAUSE:Afterconsulting withWestinghouse ElectricCorporation (themanufacturer andvendorforthesedetectors),

itwasconcluded thattheunderlying causeofthecenterelectrode degradation ofsourcerangedetectors N-31andN-32ismostlikelyduetogammacorrosion ofthebaretungstencenterelectrode (centerwire).Thiseffectoccurswheneverthesourcerangedetectorisenergized.

ANALYSISOpEVENTTheeventisreportable inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),

whichrequiresareportof,"anyoperation prohibited bytheplant'sTechnical Specification",

inthatthefailureofsourcerangedetectors N-31andN-32toindicatecountsat</=1E-10ampsonthetwointermediate rangeNISchannelswasanoperation prohibited bytheplantTechnical Specifications asfollows:oSpecification 3.5.1.1states,"TheProtection SystemInstrumentation shownonTable3.5-1shallbeoperablewhenevertheconditions specified inColumn6areexceeded".

Forthesourcerangeinstruments, column6referstoNote2,whichstates,"Channels shouldbeoperableatallmodesbelowthebypasscondition withthereactortripsystembreakersintheclosedpositionandcontrolroddrivesystemcapableofrodwithdrawal".

Contrarytotheabove,sourcerangechannelsN-31andN-32wereinoperable belowthebypasscondition of</=1E-10onbothIRNISchannelswiththereactortripbreakersclosedandthecontrolroddrivesystemcapableofrodwithdrawal.

Thiscondition existedforapproximately five(5)minutesuntilthereactortripbreakerswereopened.WhileanActionStatement existsforonesourcedetectorinoperable, thereisnostatedactionrequirement fortwo,detectors inoperable withtheReactorTripbreakersclosed.Therefore, acondition prohibited bytheplant'sTechnical Specifications existed.NRCForm366A)689)

NRCFORM366A(669)U.S.NUCLEARREGULATORY COMMISSION 2~LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMBNO.3(600104EXPIRES:A/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATEToTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTo1HEPAPERWORK REDUCTION PROJECT(3150010I),

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503.FACILITYNAME(11DOCKETNUMBER(2)LERNUMBER(6)PAGE(3)R.E.GinnaNuclearPowerPlantTEXT/I/momH>>ce/t>>I)r/irer/

Ir>>pr/r//I/orN/HRC Form366AB/(17)YEAR~rA0s00024493SEOUENTIAL NUMSER001<~~REVISION..IH:NUMER00070F11Oncethetripbreakersareopen,theminimumoperablechannelsrequiredreducestoone(1)insteadoftwo(2)andtheactionstatement statesinpartasfollows:Withthenumberofoperablechannelsonelessthantheminimumoperablechannelsrequirement, suspendalloperations involving positivereactivity changes.Anassessment wasperformed considering boththesafetyconsequences andimplications ofthiseventwiththefollowing resultsandconclusions:

Thesafetysignificance ofthefailureofbothsourcerangechannelsisthelossofdetection ofsubcritical neutronfluxinthecoreandthefunctionthosechannelsprovideforbothautomatic actuation ofthereactorprotection systemandtheprompting ofoperatoractiontoprotectshutdownmargin.However,thissignificance isminimized inthisinstanceforthefollowing reasons:0Thefailureoccurredcompletely withinthesequenceofshuttingdownthe-reactor inaccordance withplantprocedure 0-2.1inthattheoperators werecloselymonitoring thedecayoftheintermediate rangecurrentsandwereanticipating theresetlevelforthesourceranges.lnaccordance with0-2.1theoperators wereex-peditiously inserting thecontrolandshutdownrodstofivestepspriortomanuallyopeningthereactortripbreakers.

Thissequence, simultaneous withinjecting boricacidtoachievetherequiredRCScoldshutdownboronconcentration insuredthatshutdownmarginwasmaintained greaterthantherequirements ofTechnical Specifications, andthatshutdownmargindidnotdecreaseduringthisevent.NRCForm366A(BJ)9)

J NRCFORM355A(689)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEYENTREPORTILER)TEXTCONTINUATION APPROVEDOMBNO.31600104EXPIRES:4/30JS2ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUESTI50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT(31504104).

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, OC20503.FACILITYNAME(1)DOCKETNUMBER(21LERNUMBER(5)YEAR(PSEQUENTIALS)I(REVISION M3NUMSEA'P..:NUMBERPAGE(3)R.E.GinnaNuclearPowerPlantTEXTFITmo>>~JJ>>ookod, u>>aktJNealHRCAnn35543)(IT)osooo24493-0010008OioAfterimmediately recognizing thatthesourcerangechannelsdidnotindicatecountsattheintermediate rangeresetpoint,theoperators tookappropriate actionsinattempting-toreinstate

-sourcerangedetectors.

Theycontinued toexpeditiously insertcontrolandshutdownrods,andwithinfiveminutes,openedthereactortripbreakers.

Theoperatorcontinued borationtothecoldshutdown, xenonfreeconcentration requiredbyprocedure forRCScooldownbelow500degrees.Therewasnodecreaseinshutdownmargin,fromthetime'offailureofbothsourcerangechannelsuntilthetimethesparesourcerangedetectorwasusedtodeclareChannelN-32operable.

Alloperations involving positivereactivity changesweresuspenders untilafterthesparesourcerangedetectorwasdeclaredoperable.

Basedontheabove,itcanbeconcluded thatthepublic'shealthandsafetywasassuredatalltimes.VCORRECTIVE ACTIONAACTIONTAKENTORETURNAFFECTEDSYST1963TOPRE-EVENT NORMALSTATUS:0,Thedetectorinstalled insourcerangechannelN-32wasdisconnected andthepreviously installed sparesourcerangedetectorwasconnected tosourcerangechannelN-32.NISN-32highvoltagesettingandthepulseheightdiscriminator (PHD)biassettingweread)ustedtoconformtothedataforthesparedetector.

Atapproxi-mately1730ESTonMarch12,1993,sourcerangeChannelN-32wasdeclaredoperable.

NRCForm365A(SSS)

NRCFORM366A(669)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVED0MBNO.31500)04EXPIRES:6/30)92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P630),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, OC20555,ANDTO1'HEPAPERWORK REDUCTION PROJECT(31500106),

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503,FACILITYNAME(I)DOCKETNUMBER(2)LERNUMBER(6)YEARS~ySEQVSNTIAL

~2NUMSSIIREVISIONNUMSAPAGE(3)R.E.GonnaNuclearPowerPlantTEXTNmonJIMcels~,VJP~HRCForm35663)(IT)ppppp24430010009oF11Thedetectorinstalled insourcerangechannelN-31wasreplacedwithadetectorwithdrawn fromstock.Subsequently, forsourcerangechannelN-31thehighvoltagepowersupplywasreplaced.

Thedetectoranodevoltagecurve(alsoreferredtoastheplateaucurve).wasobtained, andthePHDbiassettingwasadjusted.

Atapproximately 1747ESTonMarch16,1993,sourcerangeChannelN-31wasdeclaredoperable.

oThedetectorinstalled insourcerangechannelN-32wasreplacedwithadetectorwithdrawn fromstock.Forthisnewlyinstalled

detector, theplateaucurvewasobtainedandthePHDbiassettingwasadjusted.

Theinstalled sparesourcerangedetectorwasthendisconnected fromsourcerangechannelN-32andthisnewlyinstalled sourcerangedetectorwasconnected tosourcerangechannelN-32..Thechanneloperability testwascompleted, andatapproximately 2040ESTonMarch17,1993sourcerangeChannelN-32wasdeclaredoperable, usingitsnormalsourcerangedetector.

BACTIONTAKENORPLANN19)TONUGENTREC&tRENCE:

Tominimizefuturesourcerangedetectorfailures, thefollowing actionsarebeingplanned:0Aperiodicreplacement intervalforBF~filledsourcerangedetectors willbeestablished, basedupontimeinserviceornumberofener-gizations ofthedetectors.

NRCForm366A(689)

NRCFORM366A(689)FACILITYNAME(1)UE.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORTtLER)TEXTCONTINUATION DOCKETNUMBER(2)APPROVEDOM8NO.31600104EXPIRES:4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:50/)HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P830),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT(31500104).

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503.PAGE(3)LERNUMBER(8)YEARP444SEQUENTIAL

.AyNUMSERREVISIONNUMSSRR.E.GonnaNuclearPowerPlaneTEXT///mareS>>ceJIre/Ir/red, Ireeedd/dar>>/N/IC

%%drm38642/((7)psppp244930010010OFoAnewWestinghouse designfortheseBF3filledsourcerangedetectors incorporates lowvoltagesourcerangedetectors withgold-plated tungstencenterwireconductor material.

Detectors ofthisnewdesignwillbeprocured.

Whendetectors ofthisnewdesignareinstalled, aspartofaplanneddetectorupgradeschedule, asreplace-mentsforexistingdetectors, theperiodicreplacement intervalwillbere-evaluated.

0Existingcalibration procedures willberevised,"ornewprocedures developed, toincludestepstoperformtimedomainreflectometry (TDR)measure-mentsonN-31,N-32andsparedetector, priortoscheduled refueling outages.(TDRmeasurements candetermine ifthedetectorcenterelectrode wireisbroken,shortedoutorifithashighorlowresistance)

.0Atrendingprogramtodetectpotential degradation ofsourcerangedetectors willbeestablished, forthefollowing data:1)Detectorplateaucurvedatawillbetrended.AstheBF3gasinthedetectordissociates overtime,thehighvoltagewillbeadjustedhighereachtimeuntilitcannolongerbesetontheplateau.2)PHDbiascurveswillbetrended.RMATONAPAXLEDCOMPONENTS:

Thefaultydetectors wereBF3filled,sourcerangedetectorproportional

counters, PartNo.WL-24182manufactured byWestinghouse ElectricCorporation.

NRCForm388A(889)

NRCFORM366A(SJ)9)tUS.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEOOMBNO,31500104EXPIRES:EI30(92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(F430).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.

OC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT(31500104).

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, DC20503.FACILITYNAME(1IDOCKETNUMBER(2)YEARLERNUMBER(SISEQUENTIAL NVMSERREVISIONNVMSERI'AGE(3)R.E.GinnaNuclearPowerPlantRJOOOOPooo (ssoSs(INL goooddlooIMI HRC%%dmI36643)(17)osooo244930010011OFB.PREVXOUSLERsONSIMILARKGFNTS.AsimilarLEReventhistorical searchwasconducted withthefollowing results:LER90-003(HigherThanNormalCountRateonSourceRangeNIS,DuetoaFaultyDetector, CausesaReactorTripDuringSourceRangeRe-energization) wasasimilareventwiththesamerootcause.Thecorrective actiontopreventrecur-rence,oftheeventdescribed inLER90-003,wastoinitiateaevaluation whichwillultimately resultinprocurement andinstallation ofdetectors, ofanewWestinghouse design.Itshouldbenotedthateveniftheevaluation hadbeencompleted, anddetectors ofanewdesignhadbeenprocuredandwereinstock,thesedetectors wouldnothavebeeninstalled priortothe1993outage.CSPECIALCOMMENTSNone.NRCFoIm366A(SJ)9)

Retrieved from "https://kanterella.com/w/index.php?title=ML17263A225&oldid=743048"