ML17325A849
| ML17325A849 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 06/24/1988 |
| From: | POSTLEWAIT T K, SMITH W G AMERICAN ELECTRIC POWER CO., INC., INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| LER-86-023, LER-86-23, NUDOCS 8807060119 | |
| Download: ML17325A849 (10) | |
Text
ACCELEBRATED91S'JUUBUTIONDEMONS~TJONSY~gMREGULATINFORMATIONDISTRIBUTIOIYSTEM(RIDE))",ACCESSIONNBR:8807060119DOC.DATE:88/06/24NOTARIZED:NODOCKETFACZL:50-316DonaldC.CookNuclearPowerPlant,Unit2,Indiana&05000316AUTH.NAMEAUTHORAFFILIATIONPOSTLEWAZT,T.K.IndianaMichiganPowerCo.SMITH,W.G.IndianaMichiganPoweCo.RECIP.NAMERECIPIENTAFFILIATION
SUBJECT:
LER86-023-02:on860715,erroneousaccumulatorlevelindicationresultinginlowaccumulatorvolume.W/8DISTRIBUTIONCODE:ZE22DCOPIESRECEIVED:LTRtENCL/SIZE:TITLE:50.73LicenseeEventReport(LER),IncidentRpt,etc.NOTES:RRECIPIENTZDCODE/NAMEPD3-1LASTANGFJINTERNAL:ACRSMICHELSONAEOD/DOAAEOD/DSP/ROABARM/DCTS/DABNRR/DEST/ADS7ENRR/DEST/ESB8DNRR/DEST/MEB9HNRR/DEST/PSB8DNRR/DEST/SGB8DNRR/DLPQ/QAB10NRR/DREP/RAB10DR<IB9ARES/DE/EIBRGN3FILE01EXTERNALEGSrGWILLIAMSFSHSTLOBBYWARDNRCPDRNSICMAYSFGCOPIESLTTRENCL111111112211101111111111111111111144111111RECIPIENTIDCODE/NAMEPD3-1PDACRSMOELLERAEOD/DSP/NASAEOD/DSP/TPABDEDRONRR/DEST/CEB8HNRR/DEST/ICSB7NRR/DEST/MTB9HNRR/DEST/RSB8ENRR/DLPQ/HFB10NRR/DOEA/EAB11NRR/DREP/RPB10NUDOCS-ABSTRACTRESTELFORD,JRES/DRPSDEPYFORDBLDGHOYFALPDRNSICHARRZSFJCOPIESLTTRENCL11221111'1111111111111122111111111111hDhTOTALNUMBEROFCOPIESREQUIRED:LTTR45ENCL44 NRCForm355(9.83)LICENSEEEVENTREPORTILER)U.S.NUCLEARREOULATOAYCOMMISSIONAPPAOVEOOMBNO,31504101EXPIRES:8/31/88FACILITYNAME(I)D.C.CookNuclearPlant-Unit2DOCKETNUMBER(2)PAE3)o5ooo316>OF07TITLE(IlErroneousAccumulatorLevelIndicationResultinginLowAccumulatorVolumeMONTHDAYYEAREVENTDATE(5)LERNUMBER(5)YEARÃ~'.SEQVSNtIALPr~REVOKENVM888X5IIVM88RREPORTDATE(7)MONTHOAYYEARFACILITYNAMESDOCKETNUMBER(SI05000OTHERFACILITIESINVOLVED(8)071586860230206248805000OPERATINOMODE(8)POWERLEVELTHISREPORTISSUBMITTEDPURSUANTT50.73(e)(2)(ivl50.73(e)12)(vl50.nN)(2)(vB)50.n(el(2)(vBII(A)50,73(el(2)(v)5)(BI9),73(~)(2)(el20A05(c)50.38(cl(1)50.38(c)(2)50,73(eIl2)0)5073(el(2)(EI50.73(e)(2)(51120.802(8)20405(~)(1)(l)20A05(el(I)(8)20A05(e)(1)(BII20A05(el(1)(tvl20A05(~)(I)(vlLICENSEECONTACTFORTHISLER(12)0THEREOUIREMENTSOF10CFR()I(CheckoneormoriOfthefollovffnfl(Ill73.7)(8)73.71(c)OTHERfSpeclfyInAhttrectOelowendInFeet,NRCForm3BBAINAMET.K.Postlewait-TechnicalEnineerinSuerintendentTELEPHONENUMBERAREACODE616465-5901COMPLETEONELINEFOREACHCOMPONENTFAILUREDESCRIBEDINTHISREPORT(13)CAUSESYSTEMCOMPONENTMANUFACTUREREP0RTA8L~',It~IIiCAUSESYSTEMCOMPONENTMANUFAC.TURERTONPROSXXBPECBDBPTDI204I204@~IXBPPITI204SUPPLEMENTALAEPOATEXPECTED(lelEXPECTEDSU5MlSSIONDATE(15)MONTHOAYYEARYESf/fyet,completeEXPECTEDSUBMISSIOND4FE)NOABBTRAcT(Llmlttote00tpecet,I.e.,eppronlmetelyfifteentlncleepecetypewrittenllnnl08)ThisrevisionisbeingsubmittedtoincludetheresultsofdiagnostictestingperformedduringtheSeptember1987outage.BetweenJuly15and18,1986,problemswereencounteredwiththeprocessinstrumentationmonitoringthevolumewithinaccumulator)jj'2.Complicationsdevelopedduringultrasonictesting(UT)conductedtoverifyaccumulatoroperabilitywhichresultedinthefailuretoidentifyaviolationoftheactionstatementassociatedwithlowaccumulatorvolumeandamissedsurveillanceforboronconcentration.TheadministrativeproblemsassociatedwithaccumulatorlevelverificationbyUTwerecorrected.andthismethodwasusedinlieuoftheprocessinstrumentationtoverifyaccumulatoroperabilityuntilunitshutdownforanoutageMarch3,1987.TestingperformedduringtheMarch1987outage,determinedthatthreeinstrumentcomponentsweredefective;allwerereplacedinkind.OnApril26,1987ILA<<121begantodriftupwards.OnApril30,1987,asaprecautionarymeasure,ILA-121wasdeclaredinoperable.AccumulatorlevelwasmonitoredusingUTuntilunitshutdownonAugust27,1987.TestingperformedduringtheSeptember1987outagedeterminedthatoneinstrumentcomponentwasdefective.Thecomponentwasreplacedinkindandtheprocessinstrumentationhassubsequentlyfunctionednormally.NRCForm388(Be)3I88070609880624PDRADOCK050003}6SPNU$6ZZ NRCForm3BBA(943(LICENSEENTREPORT(LER)TEXTCONTINUANU.S.NUCLEARREGULATORYCOMMISSIONAPPROVEDOMBNO,3I50-0104EXPIRES:8/3'I/88FACILITYNAME(I(DOCKETNUMBER(2)LERNUMBER(8(PAGE(3iD.C.CookNuclearPlant-Unit2TE/ET/~RRE>><<~,~~//RCr3SBA<</(mYEARosooo31686SEOUENTIALNUMBER023REVISIONNUMBER0202QF07ThisrevisionisbeingsubmittedtoincludetheresultsofdiagnostictestingperformedduringtheSeptember1987outage.ConditionsPriortoOccurrenceUnit2inMode1,RTPat48percent(91330hourson7-15-86)DescritionofEventTechnicalSpecification3.5.lbrequiresthateachaccumulator(EIIS/BP-TK)mustmaintainbetween929and971cubicfeetofboratedwaterwhiletheunitisinModes1-3(PowerOperation,Startup,andHotStandby,respectively).Iftheaccumulatorvolumedeviatesfromtheprescribedlimits,thevolumemustberestoredwithin1hourortheunitmustbeinhotshutdown(Mode4)withinthenext12hours.Processinstrumentationmonitoringaccumulatorinventory(EIIS/BP-LIT)displayswatervolumeincubicfeet.Thesystemiscomprisedof2indicatorsforeachaccumulator,onewiderange(300-1000cubicfeet)andonenarrowrange(900-1000cubicfeet).OnJuly15,1986,operatorsonshiftbecamesuspectoftheaccumulator82volumeindicationandrequestedanultrasonictest(UT)beperformedtoverifywaterinventory.QualityControlpersonnellocatedthewaterlevelusingultrasoundandthenmarked/datedthetankaccordingly;however,duringthisprocesstheirdatasheetbecamecontaminatedandwasdiscardedbeforeleavingaccesscontrol.AnewdatasheetwassubsequentlyfilledoutfrommemoryandtheControlRoomwasinformedat1330hoursonJuly15thataccumulator(/(2wasat115.75inches.Whenmathematicallyconvertedtovolume,thislevelcorrespondsto969.58cubicfeet;which,bycoincidenceonly,happenedtocloselyagreewiththeprocessinstrumentationindicationatthattime.OnJuly18,1986,at0800hoursanotherUTwasrequestedforaccumulator/!2becauseofquestionablevolumeindication.WhenQCarrivedataccumulator(/'2theydiscovereda10incherrorwasmadeintheJuly15report.Thelevelwasactually105.75inches(909.58cubicfeet)onJuly15,andnot115.75(969.58cubicfeet)asreported.Itcanthereforebededucedthatthelowerlimitforcontinuedoperation(929cubicfeet)hadbeenviolatedsinceatleastJuly15withouttheappropriatecompensatoryactionsbeingtaken.NRCFORMSBBA(EBSI*U.S.GPO:(BBB0824538/455 NRCForm366A(84)3)LICENSEENTREPORT(LER)TEXTCONTINUANV.S.NUCLEARREGULATORYCOMMISSIONAPPROVEOOMBNO.3(50-0104EXPIRES:8/31/88FACILITYNAMEl()D.C.CookNuclearPlant-Unit2OOCKETNUMBER(2)31686LFRNUMBER(6)SEQUENTIALNUMBER023REVISIONNUMBER020PAGE(3)OFTUCT(lmrsoEpsos/4rBEM)BI(,BBB///orrr/HRC/ronn36543)l17)DescritionofEvent(cont'd)ThiserrorwascompoundedduringcommunicationsbetweenQualityControlandOperationsfollowingtheUTperformedthemorningofJuly18.At0945hoursonthatmorning,QualityControlreportedthelevelofaccumulatorf32hadrisen3inchessincethelasttestperformedonJuly15.Operationswasnotmadeawareofthe10incherrordiscoveredearlier.Consequently,actingundertheimpressionthataccumulator((I2hadrisenfrom115.75inches(969.58cubicfeet)toavolumeexceedingtheupperlimitingconditionforcontinuedoperation,'perationspersonneldeclaredaccumulator82inoperablebaseduponhighlevel(itwasactuallylow)andmeasuresweretakentobegindrainingthetank.WithrespecttothevolumeincreasewhichoccurredsometimebetweenJuly15andJuly18,noconclusiveevidencecanbeproducedconfirmingthatsaidincreaseactuallyhappenedwithinasixhourtimespanprecedingboronsamplingperformedat0925hoursonJuly18.Therefore,theplantmustassumetheboronconcentrationwasnotverifiedfollowingasolutionincrease>/1percentoftankvolumeasrequiredbyTechnicalSpecification4.5.1b.Itshouldbenotedthatat0952hoursonJuly18,whilepreparationswereunderwayfordrainingaccumulator82,Unit2trippedonasteamgeneratorlevelhigh-highsignalthusplacingtheunitinMode3.Thiseventwasfurthercomplicatedat1447hoursonJuly18whentheControlRoomwasinformedthatUTresultsplaced82accumulator'slevel3inchesbelowthelastmeasurementtakenearlierthatmorning(duetodraining).Withthisinformation,andstillunawareofthe10incherrormadeonJuly15,Operationsdeclaredtheaccumulatoroperablebecausetheybelievedtheapparentlyhighvolumeofwaterhadbeenreducedtowithinacceptablelimitsforcontinuedoperation.Inreality,theaccumulatorvolumewasdraineddownfromanalreadytoolowconditiontoanevenlowerstatus.At1620hoursonJuly18,Operationsbecamecognizantofthe10incherrormadeonJuly15.Itwasrecognizedatthistimethataccumulator$!2was,andhadbeensinceatleast1330hoursonJuly15,inviolationofthelowervolumelimitrequiredbyTechnicalSpecification3.5.1b.Accumulator/f2wasimmediatelydeclaredinoperable.Coolingofthereactorcoolantsystem(EIIS/BP-AB)toachieveMode4beganat1720hoursandtheNRCwasnotifiedoftheeventbyphoneat1808hours.Effortstowardsfillingaccumulatorf/2viatherefuelingwaterstoragetank(EIIS/BP-TK)commencedat1839hoursandtheeventwasterminatedat2120hoursonJuly18whentheaccumulatorvolumeandboronconcentrationwereverifiedtobewithinthelimitingconditionforoperationasdescribedinTechnicalSpecification3.5.1band3.5.1crespectively.CooldownwashaltedpriortoreachingMode4.Withtheexceptionoftheloop2accumulatorvolumeinstrumentation,therewerenoinoperablestructures,systems,orcomponentsatthestartofthiseventwhichcouldhavecontributedtoitsoccurrence.NRCFORM366A(()4)3)oU,S.GPO.19880824538/455 0<iII NRCForm388A(943)LICENSEENTREPORT(LER)TEXTCONTINUA~NU.S.NUCLEARREGULATORYCOMMISSIONAPPROVEDOMSNO3150-0104EXPIRES8/31/88FACILITYNAME(11DOCKETNUMBER(2)LERNUMBER(BlPAGE(3)D.C.CookNuclearFlant-Unit27%XT/4/m<<oNMoo/sIFEo8or/,IrsoI/8/ooo/HRCR<<m35843/(17)osooo316YEAR@IrI86SEQUENTIALNUMBER8rV023IIEVISIONNUMSER0204OF07CauseofEventThecauseofthiseventhasbeenattributedtotheinabilityoftheprocessinstrumentationtoaccuratelyreflectthevolumewithinaccumulator82,whichresultedintheneedforultrasonictestingtoverifyaccumulatoroperability.Threedefectivecomponentswithinthesystemwerediagnosedastherootcausefortheinstrumentationfailure.theinstrumentationconsistsofacircuitboard(EIIS/BP-ECBD),straingauge(EIIS/BP-TD),potentiometerspan(EIIS/BP-EC),potentiometerzero(EIIS/BP-EC)andanarrowrangedifferentialpressureunit(DPU)(EIIS/BP-PIT).Theinitialinvestigationindicatedthatthe"zero"wasdrifting,whichresultsfromafaultycircuitboardandstraingauge.Subsequently,thesecomponentswerereplaced.Theinstrumentationsubsequentlyzeroedproperly,butdatawasnotrepeatablevhenrangedupandbackdownthemeasurementscale.Asaresult,theDPUnarrowrangewasreplacedwhicheliminatedtherepeatabilityproblem.Later,'hespanandzeropotentiometersverereplacedtoensureproperinstrumentationoperation.ThecalibratedinstrumentwasreturnedtoserviceonApril2,1987,andfunctionednormallyuntilApril26,atwhichtimethesystembegantoexhibitsignsofdriftingupwards.UltrasonicmeasurementstakenafterApril26confirmedtheactualvolumewithinaccumulatorf/2wassteadyandwellwithintheTechnicalSpecificationallowablerange,however,theresultsalsoconfirmedthatILA-121wascontinuingaslowbutsteadyupwarddrifttowardstheadministrativelimitforoperability.Asaprecautionarymeasure,ILA-121wasdeclaredinoperableat1328hoursonApril30,1987.FurtherinvestigationconductedduringtheSeptember1987outageindicatedthattherootcauseofthesecondinstrumentfailurewasafaultyDPUnarrowrange.TheDPUnarrowrangewasreplacedandthecalibratedinstrumentwasreturnedtoserviceonSeptember24,1987.Theinstrumenthassubsequentlyfunctionednormally.ContributingtothiseventwasthefactthatQualityControlpersonnelwhoperformedtheoriginalUTonJuly15didnotimplementsoundworkpracticeswhileconductingactivitiesinaradioactiveenvironment.Thisresultedinthelossofhard.copydatasupportingtestresultsforcingthoseinvolvedtorelysolelyuponmemoryrecall.ItshouldbenotedthattheUTwasperformedwithin-anextremelyharshenvironmentconsistingofelevatedtemperatureandairborneradioactivity.Theseadverseconditionscomplicatedeffortsofthetestcrewbecausefullfacemaskwasrequiredandthefatigueprocesswasaccelerated.InadequatecommunicationbetweentheControlRoomandQualityControlpersonnelfurthercomplicatedthisevent.NoformalmechanismhadbeenestablishedtoverifythatoperatorsonshifthadacompleteandaccurateunderstandingoftheUTresults.NRCFORMSBBA(948)*U.S.GPO:)988%.824538/455 NRCForm366A(94)3)LICENSEENTREPORT(LER)TEXTCONTINUNU.S.NUCLEARREGULATORYCOMMISSIONAPPROVEDOMBNO.3(9)&104EXPIRES:8/31/88FACILITYNAME(llDOCKETNUMBER(2)LERNUMBER(6)PAGE(3)D.C.CookNuclearPlant-Unit2TEXT/kmcY8<<>>48lrnr/I/EerEI/88T/I/or>>/HRC%%dnn35549/(17)YEAR3168602302(jar,SEGVENTIALjZ':REVISION49NUM88Rv>errNUMSER05OF07AnalsisofEventThiseventisreportableunderthecriteriaof10CFR50.73(a)(2)(i)asdescribedbelow.-Forapproximately3dayspriortoJuly18,1986,thevolumeofaccumulator82wasbelowitslowerlimitingconditionforoperationandthecorrespondingactionstatementassociatedwithTechnicalSpecification3.5.1bwasnotsatisfied.-BetweenJuly15andJuly18,1986,accumulator82experiencedasolutionincreasegreater>/m1percentofthetankvolumeandtheboronconcentrationwasnotverifiedtobeacceptablewithinthenext6hoursasrequiredbyTechnicalSpecification4.5.1b.Thesafetysignificanceofpoweroperationwithaccumulatorvolumeofoneaccumulatorat909.6cubicfeetratherthan929cubicfeetislimitedtoimpactontheloss-of-coolantaccidentanalysis.Thelimitingloss-of-coolantaccidentanalysisforUnit2Cycle6predictsapeakcladtemperatureof2079degreeFwitha121degreeFmargintothe2200degreeFlimitspecifiedin10CFR50.46.ExxonNuclearCompany,thefuelvendorforCycle6,wasrequestedtoevaluatetheimpactofthiseventonpublichealthandsafety.Theirresponsestated:itisExxon'sopinionthatasignificantsafetyhazardtothepublicdidnotexistforthefollowingreason.Thelimitingcaseinthereferenceindicatedapeakcladdingtemperature(PCT)of2079degreeFforoperationatlOOXpower.Operationat90percentpowerwouldresultinareductioninthePCTandwouldtendtooffsetanyincreaseinPCTduetothereducedaccumulatorliquidvolume.ThereducedaccumulatorliquidvolumealoneisexpectedtohaveaverysmalleffectonthePCT.Theaccumulatorflowwouldendapproximately1secondsoonerthanthetimeindicatedinthereference.Sincethisoccursafterthebeginningofcorerecoverytime(BOCREC)whenthedowncomerisfull,averysmalladverseeffectonrefloodrateandPCTwouldoccurandwouldbemuchlessthanthe121degreeFmarginindicatedinthereference."Itisofnotethatthedifferencebetweentheas-foundcondition(909.6cubicfeet)andthevaluespecifiedintheTechnicalSpecificationof929cubicfeetis19.4cubicfeet,orapproximately960lbs.ofwater.Inordertoconservativelyevaluatetheeffectonpeakcladtemperature,ahypotheticalscenariowasevaluatedinwhichitwasassumedthatthiswaterwasdeficientduringtherefillperiod,andhadtobemadeupbypumpedin5ectionwater.Itwouldhavetakenthepumpsapproximately1.1secondstomakeupthiswater.SincethePCTrateofheatupduringtheearlyreflood/refillperiodisabout13degree/sec.,thiswouldhaveresultedinaPCTincreaseofabout15degreeF.Adding15degreeFtothecalculatedPCTresultsinanewPCTof2094degreeF,whichisstillwellwithinthelimitsof10CFR50.46.NRCFORMSStA(94)3)8U.S.GPO:1986.0.624538/455 NRCForm388A(943)L'ICENSEENTREPORT(LER)TEXTCONTINUANU.S.NUCLEARREGULATORYCOMMISSIONAPPROVEDOMSNO.3150M)84EXPIRES:8/31/88FACILITYNAME{1)DOCKETNUMBER(2)LERNUMBER(8)PACE(3)D.C.CookNuclearPlant-Unit2TEXT/Smroodraco/rorR/)or/,I/44/8/orro/NRCFarm35(LE'4/(IT)050003]YEARP~r~+86SEQUENTIALgj<NUMBER023REVISIONNUMBER0206OFAnalsisofEvent(cont'd)Theactualchangeinpeakcladtemperature,hadanewanalysisbeenperformed,wouldhavebeenwellbelowtheabove15degreesFvaluebecausethedeficit,inwaterwouldhaveoccurredafterthebeginningofcorerecoverywhenheattransfermechanismsassociatedwithrefloodwereinplace,andtheneedforaccumulatorwaterhadsignificantlylessened.Itisalsoconcludedthatthemissedboronsurveillancewasnotofsignificance,sinceaboronsampletakenat0925hoursonJuly18containedaconcentrationof1975partspermillion(ppm),whichiswellwithintherequiredlimitsof1900and2100ppm.Basedonalloftheaboveinformation,itisconcludedthattheeventdidnotconstituteanunreviewedsafetyquestionasdefinedin10CFR50.59nordiditadverselyimpactpublichealthandsafety.CorrectiveActionsImmediatecorrective/preventativeactionconsistedof:1)promptlyincreasingaccumulatorvolumetowi.thinTechnicalSpecificationlimitsandverifyingacceptableboronconcentration;and2)obtainingindependentlyverifiedUTlevelindication,atleastonceevery10hours,toensureTechnicalSpecificationcompliancewhiletheprocessinstrumentationwas/isoutofservice.LongtermpreventativeactionwillbetoreplacealloftheaccumulatorlevelinstrumentationwithFoxboroinstrumentationassimilarproblemshavebeenexperiencedwithseveraloftheotherITT-Bartoninstruments.ThereplacementisscheduledforUnit1duringitsscheduled1989RefuelingOutageandforUnit2duringitsnextscheduledrefuelingoutagein1990.ThepersonnelresponsiblefortheinaccuratereportonJuly15havebeeninstructedintheappropriatemethodsformaintainingcleanlinessofwrittendocumentswhileinacontaminatedenvironment,andtheimportanceoftransmittingaccurateinformationutilizedtoevaluateplantconditions.Thesepersonshavesincedemonstratedthenecessaryskillstopreventarecurrenceofthiseventduringactivitiesperformedundersimilarcircumstances.ToenhancetheeffectivenessofcommunicationsbetweenQualityControlandOperationspersonnel,thedatasheet(s)withintheultrasonictestprocedurehavebeenrevisedtorequire:1)independentverificationoftestresults;and2)UnitSupervisor/SROreviewandsignature.NRCFORM3BBA(943)*U.S.GPO.'(9880824538/455 NRCFORR35BA(983)LICENSEENTREPORT(LER)TEXTCONTINUNU.S,NUCLEARREGULATORYCOMMISSIONAPPROVEOOMBNO.3150&104EXPIRES:8/31/88FACILITYNAME(1)D.C.CookNuclearPlant-Unit2OOCKETNUMBER(2)osooo31686023-02LERNUMBER(6)YEAR~+.SEQVENTIAL>y'EVISIONNUMBER.~%NUMBERPAGE(3)07QF07TEXTN/R/FBBP44B/4BqvlBI/IIFB//I/BIBBn/HRC%%dnII35549/(17)FailedComonentIdentificationComponent:EIIS:Manufacturer:ModelNumber:CircuitBoardECBDITT-Barton384Component:EIIS:Manufacturer:ModelNumber:StrainGaugeTDITT-Barton386Component:EIIS:Manufacturer:ModelNumber:DifferentialPressureUnitPITITT-Barton224-352PreviousSimilarEventsTherehavebeennosimilareventsinthepastwheretheplanthasfailedtomeettheactionstatementassociatedwithaccumulatorvolumesbeingoutofspecification.Also,theplanthasneverfailedinthepasttoverifyboronconcentrationintheaccumulatorswithin6hoursfollowingasolutionincreaseof>/J'percentoftankvolume.NRCFORMSBBA(94)3)*U.S.GPO:1985.O.B24538/455 IndianaMichiganPower".ompanyCookNuclearPlanlP.O,Box458Bridgman.MI491066164655901INDIANANICMIGANPOWERJune24,1988UnitedStatesNuclearRegulatoryCommissionDocumentControlDeskWashington,D.C.20555OperatingLicenseDPR-58DocketNo.50-316DocumentControlManager:Inaccordancewiththecriteriaestablishedby10CFR50.73entitledLicenseeEventReortinSstem,thefollowingreportisbeingsubmitted:86-023-02Sincerely,W.G.Smith,Jr.PlantManagerWGS:clwAttachmentcc:D.H.Williams,Jr.A.B.,Davis,RegionIIIM.P.AlexichP.A.BarrettH.B.BruggerR.W.JurgensenNRCResidentInspectorJ.F.Stang,NRCR.C.CallenG.Charnoff,Esq.DottieSherman,ANILibraryD.HahnINPOPNSRCA.A.BlindS.J.Brewer/B.P.Lauzau}}