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{{#Wiki_filter:ACCELERATEDD1BUTl0NDE}d04STATIONSYSI'EMREGULATOINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9002280017'OC.DATE:90/02/09NOTARIZED:NODOCKETIFACIL:50-316DonaldC.CookNuclearPowerPlant,Unit2,Indiana&05000316AUTH.NAME'UTHORAFFILiATIONDROSTE,J.B.IndianaMichiganPowerCo.(formerlyIndiana&MichiganEleBLIND,A.A.IndianaMichiganPowerCo.(formerlyIndiana&MichiganEleRECIP.NAMERECIPIENTAFFILIATION
{{#Wiki_filter:ACCELERATEDD1BUTl0NDE}d04STATIONSYSI'EMREGULATOINFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9002280017
'OC.DATE:
90/02/09NOTARIZED:
NODOCKETIFACIL:50-316 DonaldC.CookNuclearPowerPlant,Unit2,Indiana&05000316AUTH.NAME'UTHORAFFILiATION DROSTE,J.B.
IndianaMichiganPowerCo.(formerly Indiana&MichiganEleBLIND,A.A.
IndianaMichiganPowerCo.(formerly Indiana&MichiganEleRECIP.NAME RECIPIENT AFFILIATION


==SUBJECT:==
==SUBJECT:==
LER90-002-00:on900110,MSIVinoperabilityduetocondensateaccumulationonventsideofoperatingpiston.W/8ltr.DZSTRZBOTZONCODE:ZE22TCOPZESRECEZVED:LTRjENCL[SZSE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentiRpt,etc.NOTES:RECIPIENTXDCODE/NAMEPD3-1LAGIITTER,J.INTERNAL:ACNWAEOD/DSP/TPABDEDRONRR/DET/EMEB9H3NRR/DLPQ/LHFB11NRR/DOEA/OEABllNRR/DST/SELB8DNRRQ~R/LB8DlEGFXL02RGN3FILE01COPIESLTTRENCL111122111111111111111111~RECIPIENTIDCODE/NAMEPD3-1PDAEOD/DOAAEOD/ROAB/DSPNRR/DET/ECMB9HNRR/DET/ESGB8DNRR/DLPQ/LPEB10NRR/DREP/PRPB11NRR/DST/SICB7ENRR/DST/SRXB8ERES/DSIR/EIBCOPIESLTTRENCL11112211111122111111hDS44111111NOIR'IOALL'RICS"KXIPIBGSEXTERNALEG&GWILLIAMSESLPDRNSICMAYS,GNUDOCSFULLTXTLSTLOBBYWARDNRCPDRNSICMURPHYgGA111111RIDSDDSPIZASEHELPUSIOREVXZ%RKE!CGKPACT'IHEDOCXMWZCOWEDDESK-,LXSTSFORDOCUMEMISYOUDC%ITNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPXESREQUIRED:LTTR35ENCI35 IndianaMichiganPowerCompanyCookNuclearPlantP.O.Box"58.Bndgman.Ml'91066164655901INDIANANICHIGANPOWERFebruary9,1990UnitedStatesNuclearRegulatoryCommission.DocumentControlDeskRockville,Maryland20852OperatingLicenseDPR-74DocketNo.50-316DocumentControlManager:Inaccordance,withthecriteriaestablishedby10CFR50.73entitledLicenseeEvent,ReortinSystem,thefollowingreportisbeingsubmitted:90-002-00Sincerely,A.A.BlindPlantManagerAAB:clwAttachmentccD.H.Williams,Jr.A.B.Davis,RegionIIIM.P.AlexichP.A.BarrettJ.E.BorggrenR.F.KroegerNRCResidentInspectorJ.G.Giitter,NRCR.C.CallenG.Charnoff,Esg.DottieSherman,ANILibraryD.HahnINPOS.J.Brewer/B.P.Lauzau@00224<00/7+00209PDRADOCI0<00031bPDr:
LER90-002-00:on 900110,MSIV inoperability duetocondensate accumulation onventsideofoperating piston.W/8ltr.DZSTRZBOTZON CODE:ZE22TCOPZESRECEZVED:LTR jENCL[SZSE:TITLE:50.73/50.9 LicenseeEventReport(LER),Incidenti Rpt,etc.NOTES:RECIPIENT XDCODE/NAME PD3-1LAGIITTER,J.
NRCFORM366(689)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORTILER)APPROVEDOMBNO.31504104EXPIRES:4/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLFCTIONREQUEST:50.0HRS,FORWARDCOMMENTSAEGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P630),V.S.NUCLEARREGULATOAYCOMMISSION,WASHINGTON,DC20555.ANDTOTHEPAPERWORKREDUCTIONPROJECT(31500104).OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,OC20503.FACILITYNAME(I)D.C.CookPlant-Unit2DOCKETNUMBER(2)PAE050003161OF1"PTITLE<<IMainSteamIsolation"ValveInoperaiity-DuetoConensateAccumulationonVentSideofOperatingPistonEVENTDATK(5)LERNUMBER(41REPORTDATE,(7)OTHERFACILI'TIESINVOLVED(4)MONTHDAYYEARYEARSEQUENTIALNVMSEtlreIIEVISIONNVMSEIIMONTHOAYYEARFACILITYNAMESCookPlant-Unit1DOCKETNUMBER(SI05000315011090900020002099005000OPERATINGMODEIS)3POWERLEVELppp20.402(SI20.4051~I(lI(ll20406(~)(1)(lll20.405(~I(II(IIl)20.406(el(II(NI20.405(~l(l)(vlX20.405(c)50.34(cl(lI50.34(cl(2)60.73(el(2)(I)60.73(e)(2)(S)50.73(el(2)Ill))LICENSEECONTACTFOATHISLER(12I50.73(el(2)(lv)50.73(el(2llv)'0.73(el(2)(vSI.50.73lel(2)(vSI)(AI'0.73(e)12)(el)II(5)50,73(~I(2I(eITHISREPORTISSUBMITTEDPURSUANTT0THEREQUIREMENTSOF10CFR('):(Cntceontormortotrntlottowrnd)(1173.7)(S)73.71(c)OTHKR(SptcrryinAprtrtctStrowtndinTerI,HRCForm3ddAINAMEJ.B.Droste--TechnicalEngineeringSuperintendentAREACODETELEPHONENUMBER616465-5901COMPLETEONE(.INEFOAEACHCOMPONENTFAILUREDKSCRIBEDINTHISREPORT(13)CAUSESYSTEM\'COMPONENTMANUFACTVREREPORTABLETONPRDSCAUSESYSTEMCOMPONENTMANUFACTVRERBSBVTVX999.Y'Prr.,~4.NXrr.r..SUPPLEMENTALREPORTEXPECTED(14)YEStttytr,comprtrtFXPECFEDSVSMISSIONDAFEIXABS'TAACTtLimrtrott00Iptctt,r,t.,tpprorimtttiytrttttntin(littoterryptwrirttntmttt(14)FXPECTED'UbMISSIONDATE(ISIMONTHDAYYEAROnJanuary8,1990withUnit2inMode3-(HotStandby)surveillancetestingoftheMainSteamIsolationValves(MSIV's)wasconducted.TwoMSIV'sexhibitedaclosingtimeinexcessoftheTechnicalSpecification3.7.1.5limitoffiveseconds.Thiscondit'ionisbelieved.tohave,existedduringpoweroperation.AdditionalMSIVtestingonJanuary9,and10,1990confirmedthatexcessivecondensationwascollectingontheventsideoftheMSIVoperatingpiston.Whenthedumpvalveswereopenedtovent-offsteamfromtheMSIVoperatingpiston,theaccumulatedcondensatewouldflashtosteamandresultinincreasedMSIVclosuretimes.FollowinganefforttoblowouttheMSIVcondensatedraintubes,aseriesoftestswereperformedatvarioustimeintervals.todetermineifthecondensateproblemhadbeenresolvedandverifyMSIVoperability.Withthefailureof2-MRV-220onJanuary11,1990,at0916hours,itwasevidentthatthecondensatep'roblemwasstillpresent.AllMSIV'sweredeclaredinoperable.andanUnusualEventwasdeclared.AcooldowntoMode5(ColdShutdown)wasstarted.RepairactivitiesincludeddisassemblyoftheMSIV'stoenlargethecondensatedraintubeportandtheequalizingsteamnipple.AdditionalinsulationwasplacedontheMSIV's,ventpipingandvalves.NRCForm366(669)
INTERNAL:
NRCFORM366A(6J)9)V.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION"APPROVEDOMBNO.31500)OSEXPIRES:S/30/92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTBRANCH(P430).U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,OC20555.ANDTOTHEPAPFRWORKREDUCTIONPROJECT(3(500104).OFFICEOFMANAGEMENTANDBUDGET.WASHINGTON,OC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(6)SEQVENTIALNVMEERREVISIONNVMSERPAGE(3)-D.C.CookPlant-Unit2TEXT///morespeceiereqvirN/.Irse~HRC%%drm3(SEA's/(12)osooo316900020000CONDITIONSPRIORTOOCCURRENCEUnit2inMode3(HotStandby).DESCRIPTIONOFEVENTOnJanuary8,1990,surveillancetestingoftheMainSteamIsolationValves(MSIV'-s)(EIIS/SB-ISV)wasconducted.TwooftheMSIV'sexhibitedaclosingtimeinexcessoftheTechnicalSpecification3.7.1.5limitoffiveseconds.FollowingeachMSIVfailure,theMSIVwasdeclaredinoperableandimmediatelyretested.InbothcasestheretestdemonstratedthevalveclosedwithintheTechnicalSpecificationtimelimitandthe,MSIVwasdeclaredoperable.AdditionaltestswereconductedonJanuary9,1990.Asubstantialamountofwaterwasobservedtoflashoutofthedumpvalve(EIIS/SB-VTV)ventstacksduringthefirst'estofeachMSIV.ThreeMSIV's.exhibitedaclosingtimeinexcessoftheTechnicalSpecification3.7.1.5limitoffiveseconds.FollowingeachMSIVfailure,theMSIVwasdeclaredinoperableandretested.In-eachcasetheretestdemonstratedthevalveclosedwithintheTechnicalSpecificationtimelimitandtheMSIV'sweredeclaredoperable.(Seeattachedtesttable).TheJanuary9,1990testingverifiedthatenoughcondensationcouldaccumulateontheventsideofthepistonwithina24hourperiodto'enderthevalveinoperable.Unit2washeldinMode3tofurtherdiagnosetherootcauseofthisissue.5Sec.6Sec.TIMECONTROLROOMSWITCHACTUATIONTOLIGHTMSIVSTEMTRAVELOnJanuary10,'1990,aseriesofdiagnostictestswereperformedtodeterminetheextentthatcondensatewithintheMSIVoperatingcylindervolumecouldaffectMSIVstroketime.Astripchartwasusedtorecordpressurewithinthevolumeasafunctionoftime.Closuretimewasmeasuredinthecontrolroom,measuringthetimefromthedumpvalveswitchactuationuntiltheMSIVvalvelightindicatedthevalvewasclosed.MSIVstemtraveltimewasmeasuredlocally.Thefollowingtime.lineissimilartoeachMSIVtestedandrepresentstypicalcircumstancesexperiencedbyallMSIV's.01Sec:2Sec.3Sec.4Sec.FLASHINGrNRCForm366A(669)
ACNWAEOD/DSP/TPAB DEDRONRR/DET/EMEB9H3 NRR/DLPQ/LHFB11 NRR/DOEA/OEABll NRR/DST/SELB 8DNRRQ~R/LB8DlEGFXL02RGN3FILE01COPIESLTTRENCL111122111111111111111111~RECIPIENT IDCODE/NAME PD3-1PDAEOD/DOAAEOD/ROAB/DSP NRR/DET/ECMB 9HNRR/DET/ESGB 8DNRR/DLPQ/LPEB10 NRR/DREP/PRPB11 NRR/DST/SICB 7ENRR/DST/SRXB 8ERES/DSIR/EIB COPIESLTTRENCL11112211111122111111hDS44111111NOIR'IOALL'RICS"KXIPIBGSEXTERNALEG&GWILLIAMSESLPDRNSICMAYS,GNUDOCSFULLTXTLSTLOBBYWARDNRCPDRNSICMURPHYgGA111111RIDSDDSPIZASEHELPUSIOREVXZ%RKE!CGKPACT'IHEDOCXMWZCOWEDDESK-,LXSTSFORDOCUMEMIS YOUDC%ITNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPXESREQUIRED:
NRCFORM355A~)549)U.S.NUCLKARREGULATORYCOIAMISSIONLICENSEEEVENTREPORTILER)TEXT.CONTINUATIONAPPROVEDOMSNO.31504104EXPIRES.4/30/92ESTIMATEDbURDENPERAESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST)500HRS.FORWARDCOMMENTSREGARDINGSURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTSRANCHIP430).U.S.NUCLEARREGULATORYCOMMISSION.WASHINGTON.OC20555,ANDTO1HEPAPERWORKREDUCTIONPAO/ECT13150410i)iOFFICEOFMANAGEMENTANDSUDQET,WASHINGTON.DC20503.FACILITYNAMEl1)DOCXETNUMSER(21LERNUMSERIS)~AGE13)D,C.CookPlant-Unit2TEXT///verePPPCP)I/Pquia/,MPP//I/bbP//YRC%%dnt)30SA'P/)IT)osooo316YEAR9.0SEQUENTIALNUMKll@002.'-REVISIONNUM9II000OF10LocalobservationverifiedsubstantialquantitiesofwaterandsteambeingdischargedfromtheventstackfromT0untilMSIVstemtravelbegan.TwooftheMSIV'sexhibitedaclosingtimeinexcessoftheTechnicalSpecification3.7.1.5limitoffiveseconds.'FollowingeachMSIVfailure,theMSIVwasdeclaredinoperableandretested.IneachcasetheretestwasanacceptablevalueandtheMSIVwasdeclaredoperable(seeattachedtesttable).TheActionRequirementsofTechnicalSpecification3.7.1.5werefulfilledatalltimesforModes2and3.WhenanMSIVfai'lureoccurred,animmediateretestdemonstratedthatthevalvewasoperable.OnJanuary10,1990,itwasrealizedthatthefailureswhichoccurredonJanuary8,1990,werebelievedtohaveexistedduringpoweroperation.NotificationtotheNRCwasmadeonJanuary10,1990,reportingthatwewereoutsidetheplants'esignbasesonJanuary-8,1990.Atthetimethisnotificationwasmade,theMISV'swereoperableperTechnicalSpecificationActionRequirementsforModes2and3operation.TheMSIV'swereoperablesincethetestingresultedinexpellingthecondensate,fromtheventsideofthevalve'soperatingpiston.TheMSIV'swouldremainoperableaslongasthevalveswerecycledfrequentlyenoughtdpreventexcessiveamountsofcondensatefromcollectingontopoftheoperatingpiston.~TheMSIVtestingconfirmedthattheslower,mainsteamstopvalvestroketimesweresymptomsofanunacceptab1equantityofcondensateaccumulatingintheuppervalvevolume;Whenadumpvalveisopenedthecondensateflashestosteam'thiscausesincreasedventingtimeduetodelayingthedevelopmentofsufficientDelta-PacrosstheMSIVpiston,toclosetheMSIV's.A"logicalhypothesiswasformulatedthatcondensatewas'notdrainingdownintothelowervolumethroughthedraintube(seeattacheddrawings)fastenoughtopreventaccumulationintheuppervolume.Actingunderthepremisethatthisflowpathwasinsomewayrestricted,possiblyduetomineraldepositsplatingoutontheinsidediameterofthedraintube,itwasdecidedtoattempttoblow-outthisdraintube.Aprocesswasdevisedtoremove(blow-out)anypossiblerestrictionslocatedwithineachMSIVdraintubes.ThiswasaccomplishedbymaintainingtheMSIVinitsclosedpositionandforapproximatelyonehourwiththedumpvalvesopen.In'doingso,mainsteamwascapableofforcingitswaypasttheparallelclosuredisc,throughthedraintubeintotheuppervolume,andexhaustedouttheventstack.,Itwashopedthatthisexhaustedsteamwouldbeofsufficientvelocitytocarryawayanyrestrictivematerial.NACForm395A1509)
LTTR35ENCI35 IndianaMichiganPowerCompanyCookNuclearPlantP.O.Box"58.Bndgman.
NRCFORMSSSAISeS)tU.S.NUCLEAAREGULATORYCOMMISSIONPLICENSEEEVENTREPORTILER)TEXTCONTINUATIONAPPAOVEDOMSNO.S)504104E)IPIRES:S/20/02ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREOUESTI50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPOATSMANAGEMENTBRANCHIPe30).U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTOTHEPAPERWORKREDUCTIONPRO/ECT121504)OS).OFFICEOFMANAGEMENTANDBUDGET,WASHINGTON,OC2050KIrACILITYNAME)1)DOCKETNUMBER)2)LERNUMBERIS)PAGEIS)D.C.CookPlant-Unit2TEXTlllmore<<eoe/ereevrw/,ow//r/orO///RC%%dnIISSSAB/)12)osooo'316YEAR4g90sEovsNTIALoENVMSSR002IISVISIONNVMSN0004.OF10Additionaltestingwasperformedtodetermineifthemaintenanceactionwassuccessfulandensure.MSIVoperability.Thisseriesoftestshadstaggered'estintervalstoensureMSIVoperabilityw'asmaintained.OnJanuary11,1990,at0916hours,2-MRV-220exceededtheallowedclosingtime.AnUnusualEventwasdeclaredasallfour(4)MSIV'sweredeclaredinoperablecausingaTechnicalSpecification3.0.3shutdown.Thiswasclassifiedasa'One-Hour,ReportableEventandNRCnotificationwasmadeat0930hours.AcooldowntoMode5(ColdShutdown)wascommenced.CAUSEOFEVENTInvestigationrevealedthatthefailureof'heMSIV'swascausedbyexcessivecondensateaccumulationontheventsideoftheMSIV'operatingpiston.Theexcessivecondensateaccumulationwasaresultofthefollowingcontributingfactors:InsulationLessthanCurrentDesin-InsulationonMSIV,theventpipingandassociatedvalveswaslessthancurrentdesignspecifications.TheinsufficientinsulationresultedinincreasedcondensationratesintheMSIV.2.DumValveSeatLeakaeThequantityofcondensatethatcancollectisrelatedtothemassofsaturatedsteampermittedtoentertheupperequalizingsteamvolume.Whensteamisallowedtoescapethisvolume,itwillbereplacedbyadditionalsaturatedsteamwhichincreasestheDelta-Pandpreventsdrainage.3.MSIVActuatorDesinThecombinedeffectsofoneandtwoaboveresultedinincreasedcondensationrates,developinggreaterDelta-Pacrosstheoperatingpistonthanassumedbydesignduringnormaloperation(MSIV'sinsteady-stateopenposition).Therateatwhichcondensatecanflowdownfromtheuppervolumethroughthedraintubeislimitedbythediameterofthedraintubeportholes.Condensatewillaccumulatewithintheupperequalizingvolumeifitcannotbedrainedfasterthanitforms.Ifthesteamnippleisinsufficientlysized,aDelta-Pwillexistacrossthepistonrestrictingcondensatedrainage.NRCFomrSSSAISeS)
Ml'91066164655901INDIANANICHIGANPOWERFebruary9,1990UnitedStatesNuclearRegulatory Commission
NRCFORM355AISJ)91US.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEOOM8NO,3150010>>EXPIRES:>>/30/92ESTIMATED8UROENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREOUESTI50.0HRS.FORWARDCOMMENTSREGARDING8URDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTSRANCHIP430).U.S.NUCLEARsREGULATORYCOMMISSION,WASHINGTON,DC20555,ANDTO1HEPAPERWORKREDUCTIONPROJECT13150010l).OFFICEOFMANAGEMENTAND8UDGET,WASHINGTON,DC20503.FACILITYNAME111D.C.CookPlant-Unit2TEXT////>>P/>><<eC>>/1I>>qvnd,uJePI/P5/>>/HJICfcnn38559/)12)DOCKETNUMSER12)os0oo316YEAR90LERNUMSER15),>>jjSEOVENTIALyg:AEVOONHVM5<<<~+HVM002-00~AGE13)050F10ANALYSES,OFEVENTInadditiontoTechnicalSpecification3.7.1.5,slowMSIVclosuretimesaffectTechnicalSpecificationitems3.3.2.1,Table3.3-5,5.h(HighSteamLineFlow-LowLowTavg),6.h(SteamLinePressureLow),and7.c(ContainmentPressure-HighHigh).Theseitemsusethevalveclosuretimeaspartoftheiroveralltimeresponserequirement.Examinationofsurveillancedatafortheseitemsshowthatitem7.c,steamlineisolationonhigh-highcontainmentpressureinsevenseconds,wouldnotbemet.ThiswasreportedtotheNRConJanuary10,1990,undertheprovisionsof10CFR50.72.b.l.ii.Basaconditionthatwasoutsideoftheplant'sdesignbasis.Theinvestigationofthisproblemhasidentifiedthattheslowerclosuretimeswerecausedbywateraccumulationonthetopofthesteampiston.Withwaterpresent,thepistonmovementisslowedasthewaterflashestosteamduringtheventingprocess.Thewater.accumulationoccursovertimeandisalsoaffectedbytheleakagepasttheMSIVdumpvalves.Oncethewaterisremovedfromthetopofthepiston,aswouldoccurduringavalvetest,.aretestconductedimmediatelythereafterwouldindicatenormalva3veactuationtimes.Aswaterwouldaccumulateduringoperation,thereisevidencethattheconditionmayhaveexistedpriortothesurveillance.Thus,itisprobabl'ethatTechnicalSpecification4.7.1.5.1wasnotmet.WestinghousehasevaluatedtheconsequencesofincreasingallapplicableTechnicalSpecificationresponsetimesbythreeseconds,andtheyhaveconcludedthattheFSARacceptancecriteriaaremetusingthelongerresponsetimes.ThemassandenergyreleasesforanoutsideofcontainmentsteamlinebreakwerecomparedwiththecurrentFSARvalues,andthe'nvironmentalqualificationoftheequipmentintheaffectedlocationshasnotbeencompromised.Thus,therehasbeennosignificantdegradationofplantsafetyasaresultoftheincreasedMSIVclosuretimes.SinceUnit1hasthesametypeofvalve,anevaluationwasalsoperformedconcerningthe'impacton.Unit1.TheevaluationconcludedthattheMSIV'son,Unit1areconsideredtobeoperableandfullysupportiveoftheChapter14accidentanalyses.Atthelastsurveillances,allTechnicalSpecificationsapplicabletosteamlineisolationweremet,andthehistoricaldataindicatenopatternofclosuretimedeterioration.Further,therecentWestinghouseanalysisshowsthatsufficientmarginexistswithMSIVclosuretimesuchthatplantsafetyisnotcompromisedifthe'systemresponsetimeisincreasedbythreeseconds.Thus,therecenteventsassociatedwiththeUnit2MSIV'sdonotcauseundueconcernwithrespecttothecontinuedsafeoperationofNRCFons355A(5891 NRCFORM344A~14e9)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORTILER)TEXT.CONTINUATIONAPPROVEOOMSNOl31500)0OExpIREs:el30)92ESTIMATEDBURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREOUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTSRANCH(P430).U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON.DC20555,ANDTOTHEPAPERWORKREDUCTIONPROJECT131504)104),OFFICEOFMANAGEMENTANDSUOGET.WASHINGTON.DC20503.FACILITYNAME11)DOCKETNUMSER12)YEARLERNUMSER(4)rX<OSEQUENTIAL?P~WIIEYISIONNVMFEAi.rXNVMI'AGE13)D.C.CookPlant-Unit2TEXTNmorea>>ooJrreqond,Irreorroeo'onerHRCformSOD'e))12)osooo31690-002-0006oF10Unit1.Thisconclusionisals'obasedonthebeliefthatthepresentperformanceoftheUnit1MSIV'sdonotresultintheprobabilityorconsequencesofanaccidentbeingincreased,anynewtypeofaccidentbeingcreated,andanyTechnicalSpecificationmarginofsafetybeingreduced.CORRECTIVEACTIONSUponreachingMode5,allfourMSIV'sweredisassembledandavisualexaminationperformed.Theseexaminationsrevealedthatthedraintubeshadnotexperiencedanyphysicaldegradationthatcouldhaverestrictedthecondensateflowpath.Alldimensionswereverified.ElectricITEdeFrance(FDF)wascontactedconcerningtheirapproachatresolvingsimilarcircumstances.EDFprovidedtheirinvestigationfindingsandvalvedesignmodifications.WeimplementedtheEDFrecommendations.Afterallavailablesourcesofinformationweretechnicallyevaluated,itwasdeterminedthatallUnit2MSIV'swouldbemodifiedviaMinorModification2-Mf-079.Underthismodificationthediameterofdraintubeportholeswouldbeincreasedfrom1'/8"(0.125")to5mm(0.197")andthediameteroftheequalizingsteamnipplewouldbeincreasedfrom1/8"(0.125")'o10mm(0.394").Twoperformancerelatedfunctionswouldbeimprovedinthismanner.l.Increasingthesizeofthedraintubeportholesprovid'esalargerareatoimprovecondensateflowthroughtheactuatorpiston.2.Increasingthesizeoftheequalizingsteamnipplewillprovidealessrestrictivepathforsteamtopassupthroughthepistontomaintainequilibriumandpreventsteamfrompassingthroughthedraintubeandinhibitdrainage.ItwasalsodiscoveredatthistimethattheinsulationontheMSIV,ventpipingandassociatedvalveswaslessthanthecurrentdesignspecificationrequirements..Thiscontributedtoalargervarianceintemperature(Delta-T)resultinginmoreheattransferandincreasingthecondensationrate.Aftercompletingallmodificationsandreassemblingthe,MSIV's,SpecialProcedure2-THP.SP.MM-079wasusedtoverifyoperability.ThisprocedureincludedaseriesoftestcyclesforallMSIV'satdifferentintervalswiththeappropriateinstrumentationrequiredtomeasureandrecordallapplicableperformancevariables,specificallytherateofpressuredropintheventline.NRCForm344AI5$9)P NRCFORMSSSA(5JISIU.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDOMSNO.S1500104EXPIRES:A/SO/52ESTIMATEDSUROENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST:500HRS.FORWARDCOMMENTSREGARDINGSURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTSRANCHIP5201.U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON.DC20555.ANDTOTHEPAPERWORKREDUCTIONPROJECT(S(5041(M).OFFICEOFMANAGEMENTANDSUDGET,WASHINGTON,OC20502,FACILITYNAME(1)DOCKETNUMSER(21YEARLERNUMSER(5)YP>',SSQVSNTIA'LNVMSllII5YISIONNVMSA~AGELSID.C.CookPlant-Unit2TEXTIIImcmapeceJIIPSw'wI,PPPaAWonVHRCRPmI~SI(12(oso0031690002I-00070F10Theacceptancecriteriausedwithin'2-THP.SP.MM-079wastwofold.First,eachfullclosurestroketimemustbewithin5secondsinaccordancewithTechnicalSpecification3.7.1.5.Second,therateofpressure,dropintheventlinemustnotchangeasthetestintervalisextendedto24hours.Thissecondcriteriawasusedtoverifynoadditionalcondensatehadaccumulatedwithintheuppersteamvolumethatcouldlengthenstroketimeanddelaystemtraveluponflashingtosteamduringtheventingprocess.Allstroketestsperformedinaccordancewith2-THP.SP.MM-079,exceptthefirsttestonMRV-210,provided.acceptableresultsandverifiedthegenericcondensateissue.hadbeenresolved;Theiniti'altestperformedonMRV-210failed.Thecorrespondingrateofpressuredropintheventlinesignatureverifiedsignificantquantitiesofcondensatestillpresent.Investigation.revealedthatTrainBDumpValveMRV-212wasnotse'stingproperlypermittingasignificantamountof-steamtobeexhaustedouttheventstack.Underthesecircumstances,additionalsteamwasbroughtintotheuppervolumewithcondensatecollectingataratefasterthancouldbedrained.MRV-212wasrepairedandsubsequentclosuretestscompletedonMRV-210verifiedthatthis.isolatedincidenthadbeenresolved.AllMSIV'swerereturnedtoanoperablestatusandUnit2returnedtopoweroperation.Asstatedintheanalysis,wedonotexpecttoencountersimilardifficultieswiththeUnit1MSIV's.However,wearecurrentlyaddinginsulationtotheUnit1MSIV's,ventlinesandvalvestoenhancetheMSIVoperatingconditions.IFAILEDCOMPONENTIDENTIFICATIONComponentID:MainSteamIsolationValves2-MRV-210,2-MRV-220,2-MRV-240Manufacturer:Hopkinsons-FerrantiModel:2379WPREVIOUSSIMILAREVENTS050-316/83-57NRCFormSSSA(SSSI NRCFORM344A<Se9)LICENSEEEVENTREPORT{LERITEXTCONTINUATIONt~APPROVEO0MBNO.31500104EXPIRES)4/30/93ESTIMATEDSURDENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONRFOUESTI500HRS.FORWARDCOMMENTSREGARDINGSURDENESTIMATETOTHERFCORDSANDREPORTSMANAGEMENTBRANCHIPS30),U.S,NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC30555,ANDTOTHEPAPERWORKREDUCTIONPROJECT131504))041-OFFICEOFMANAGEMFNTANDSUDGET,WASHINGTON.DC30503.fACILITYNAMEIl)DOCKETNUMSER)3)YEARLERNUMSER)4)SCOVCNTIALNVMCRIICVISIONNVMCA~AGE13)D.C.CookPlant-Unit2TEXTlllmorpgfdcglgnqvssd,we~HRCJtgwiiSRSC'4)(17)oeo0o316900020008oF10MAINSTEAMISOLATIONVALVETESTTABLEJanuar8,1990TestinVALVEINITIALCLOSINGTIME(SEC)RETEST(SEC)2-MRV-210=2-IIRV-2405.945.183.011.95'Januar~9,1990Testin2-MRV-2102-MRV-2202-MRV-2405.075.605.05"2.832.282.21Januar10,1990Testin2-MRV-2102-MRV-2205.785.733.082.55'anuar11,1990Testing2-MJRV-2205.26NoRetestPerformedNOTE:Duringthetestprogram2-HRV-230closingtimeswerehigh,hut'didnotexceedtheTechnicalSpecificationLimitoffiveSeconds.NRCFoIIm344A144)9)
.Document ControlDeskRockville, Maryland20852Operating LicenseDPR-74DocketNo.50-316DocumentControlManager:Inaccordance, withthecriteriaestablished by10CFR50.73entitledLicenseeEvent,ReortinSystem,thefollowing reportisbeingsubmitted:
NRCFORM364A1640)FACILITYNAME111US.NUCLEARAEGULATOAYCOMMISSIONLICENSEEEVENTREPORTILER)TEXTCONTINUATIONDoerETNUMSER(2)APPAOVEDOMSNO,31500)04EXPIRE5:4/30/02ESTIMATEDSUADENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLLECTIONREQUEST:500HRS.FORWARDCOMMENTSREGAROINOSUADENESTIMATETOTHERECORDSANDREPORTSMANAGEMENTSRANCHIP430).U.S.NUCLEARREGULATORYCOMMISSION.WASHINGTON.OC20655,ANDTO1HEPAPERWORKREDUCTIONPRO/ECT13)50410E).'OFFICE~OFMANAGEMENTANDSUOGET,WASHINGTON,DC10503.PAGEIS)LEANUMSER(4)D..C.CookPlant-Unit2,TEXT///nxros/>>ce/sr)V/rer/1>>e~PT/Or>>/HIICFerrrrAXLES/(17)YEARosooo31690SEQUENTIALNVM4II002HEY>>ION)rvMER00'09QF10tMAINSTEAMISOLATIONVALVENOTE:VALVESHOWNINCLOSEDPOSITIONOPERATINGPISTON~VENTLINETOSTEANDUMPVALVESSTEAMNIPPLECONDENSATEDRAINLINECONDENSATEDRAINPORTVALVEMODIFICATIONSCONDENSATEDRAINPORTINITIALLY-0125"MODIFIEDTO-.0..'197"(5MM)STEAMNIPPLEINITIALLY"0'125"MODIFI'EDTO0.394"(10MM)~~4/g,.NRCForm346A(680)
90-002-00 Sincerely, A.A.BlindPlantManagerAAB:clwAttachment ccD.H.Williams, Jr.A.B.Davis,RegionIIIM.P.AlexichP.A.BarrettJ.E.BorggrenR.F.KroegerNRCResidentInspector J.G.Giitter,NRCR.C.CallenG.Charnoff, Esg.DottieSherman,ANILibraryD.HahnINPOS.J.Brewer/B.P.
NRCFORM385A(54ISIU.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDOMSNO.315040104EXPIRES;4I30JS3ESTIMATEDSURQENPERRESPONSETOCOMPLYWTHTHISINFORMATIONCOLL'ECTIONREQUEST:50.0MRS.FQRWARQCOMMENTSREOAROINObUROEHESTIMATETOTHERECORDSANDREPORTSMANAOEMEHTSRANCHIf@30).U.S.NUCLEARREOULATORYCOMMISSION.WASHINOTOH,DC30555,AHQTQ1HEfAPFRWORKREDUCTIONPROJECT131504)104),QffICEOFMANAGEMENTAHDSUDOET,WASHINGTON,DC30503,fACILITYNAMEIl)DOCKETNUMSER13)YEARLERNUMSERIblSEOVENTIALNVMSEIIII5VISIONNVM~IIPACEISID.C.CookPlant-Unit2TEXTIllII>>IFZ>>ceJFIP0vbe4uwFIRRSN>>FJYRC%%dYm~3Il)T),osooo3l6900020010OF]0HAINSTEAMISOLATIONVALVEVENTPIPINGVENTSTOATMOSPHEREDUMPVALVES3-WAYMOTOROPERATEDVALVEMSIVHRCF~SeSAISJISI}}
Lauzau@00224<00/7
+00209PDRADOCI0<00031bPDr:
NRCFORM366(689)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORTILER)APPROVEDOMBNO.31504104EXPIRES:4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLFCTION REQUEST:50.0HRS,FORWARDCOMMENTSAEGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P630),V.S.NUCLEARREGULATOAY COMMISSION, WASHINGTON, DC20555.ANDTOTHEPAPERWORK REDUCTION PROJECT(31500104).
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, OC20503.FACILITYNAME(I)D.C.CookPlant-Unit2DOCKETNUMBER(2)PAE050003161OF1"PTITLE<<IMainSteamIsolation" ValveInoperaiity-DuetoConensateAccumulation onVentSideofOperating PistonEVENTDATK(5)LERNUMBER(41REPORTDATE,(7)OTHERFACILI'TIES INVOLVED(4)MONTHDAYYEARYEARSEQUENTIAL NVMSEtlreIIEVISION NVMSEIIMONTHOAYYEARFACILITYNAMESCookPlant-Unit1DOCKETNUMBER(SI 05000315011090900020002099005000OPERATINGMODEIS)3POWERLEVELppp20.402(SI 20.4051~I(lI(ll20406(~)(1)(lll20.405(~I(II(IIl)20.406(el(II(NI 20.405(~l(l)(vlX20.405(c) 50.34(cl(l I50.34(cl(2)60.73(el(2)(I)60.73(e)(2)(S) 50.73(el(2)Ill))LICENSEECONTACTFOATHISLER(12I50.73(el(2)(lv) 50.73(el(2llv)'0.73(el(2)(vSI
.50.73lel(2)(vSI)(AI
'0.73(e)12)(el)I I(5)50,73(~I(2I(eITHISREPORTISSUBMITTED PURSUANTT0THEREQUIREMENTS OF10CFR('):(Cntceontormortotrntlottowrnd)
(1173.7)(S)73.71(c)OTHKR(SptcrryinAprtrtctStrowtndinTerI,HRCForm3ddAINAMEJ.B.Droste--Technical Engineering Superintendent AREACODETELEPHONE NUMBER616465-5901COMPLETEONE(.INEFOAEACHCOMPONENT FAILUREDKSCRIBED INTHISREPORT(13)CAUSESYSTEM\'COMPONENT MANUFACTVREREPORTABLE TONPRDSCAUSESYSTEMCOMPONENT MANUFACTVRERBSBVTVX999.Y'Prr.,~4.NXrr.r..SUPPLEMENTAL REPORTEXPECTED(14)YEStttytr,comprtrtFXPECFEDSVSMISSION DAFEIXABS'TAACT tLimrtrott00Iptctt,r,t.,tpprorimtttiy trttttntin(littoterryptwrirttn tmttt(14)FXPECTED'UbMISSION DATE(ISIMONTHDAYYEAROnJanuary8,1990withUnit2inMode3-(HotStandby)surveillance testingoftheMainSteamIsolation Valves(MSIV's)wasconducted.
TwoMSIV'sexhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.Thiscondit'ion isbelieved.tohave,existedduringpoweroperation.
Additional MSIVtestingonJanuary9,and10,1990confirmed thatexcessive condensation wascollecting ontheventsideoftheMSIVoperating piston.Whenthedumpvalveswereopenedtovent-offsteamfromtheMSIVoperating piston,theaccumulated condensate wouldflashtosteamandresultinincreased MSIVclosuretimes.Following anefforttoblowouttheMSIVcondensate draintubes,aseriesoftestswereperformed atvarioustimeintervals.
todetermine ifthecondensate problemhadbeenresolvedandverifyMSIVoperability.
Withthefailureof2-MRV-220 onJanuary11,1990,at0916hours,itwasevidentthatthecondensate p'roblemwasstillpresent.AllMSIV'sweredeclaredinoperable.and anUnusualEventwasdeclared.
AcooldowntoMode5(ColdShutdown) wasstarted.Repairactivities includeddisassembly oftheMSIV'stoenlargethecondensate draintubeportandtheequalizing steamnipple.Additional insulation wasplacedontheMSIV's,ventpipingandvalves.NRCForm366(669)
NRCFORM366A(6J)9)V.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION" APPROVEDOMBNO.31500)OSEXPIRES:S/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, OC20555.ANDTOTHEPAPFRWORK REDUCTION PROJECT(3(500104).
OFFICEOFMANAGEMENT ANDBUDGET.WASHINGTON, OC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(6)SEQVENTIAL NVMEERREVISIONNVMSERPAGE(3)-D.C.CookPlant-Unit2TEXT///morespeceiereqvirN/.
Irse~HRC%%drm3(SEA's/(12)osooo316900020000CONDITIONS PRIORTOOCCURRENCE Unit2inMode3(HotStandby).
DESCRIPTION OFEVENTOnJanuary8,1990,surveillance testingoftheMainSteamIsolation Valves(MSIV'-s)
(EIIS/SB-ISV) wasconducted.
TwooftheMSIV'sexhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.Following eachMSIVfailure,theMSIVwasdeclaredinoperable andimmediately retested.
Inbothcasestheretestdemonstrated thevalveclosedwithintheTechnical Specification timelimitandthe,MSIVwasdeclaredoperable.
Additional testswereconducted onJanuary9,1990.Asubstantial amountofwaterwasobservedtoflashoutofthedumpvalve(EIIS/SB-VTV) ventstacksduringthefirst'est ofeachMSIV.ThreeMSIV's.exhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.Following eachMSIVfailure,theMSIVwasdeclaredinoperable andretested.
In-eachcasetheretestdemonstrated thevalveclosedwithintheTechnical Specification timelimitandtheMSIV'sweredeclaredoperable.
(Seeattachedtesttable).TheJanuary9,1990testingverifiedthatenoughcondensation couldaccumulate ontheventsideofthepistonwithina24hourperiodto'enderthevalveinoperable.
Unit2washeldinMode3tofurtherdiagnosetherootcauseofthisissue.5Sec.6Sec.TIMECONTROLROOMSWITCHACTUATION TOLIGHTMSIVSTEMTRAVELOnJanuary10,'1990,aseriesofdiagnostic testswereperformed todetermine theextentthatcondensate withintheMSIVoperating cylindervolumecouldaffectMSIVstroketime.Astripchartwasusedtorecordpressurewithinthevolumeasafunctionoftime.Closuretimewasmeasuredinthecontrolroom,measuring thetimefromthedumpvalveswitchactuation untiltheMSIVvalvelightindicated thevalvewasclosed.MSIVstemtraveltimewasmeasuredlocally.Thefollowing time.lineissimilartoeachMSIVtestedandrepresents typicalcircumstances experienced byallMSIV's.01Sec:2Sec.3Sec.4Sec.FLASHINGrNRCForm366A(669)
NRCFORM355A~)549)U.S.NUCLKARREGULATORY COIAMISSION LICENSEEEVENTREPORTILER)TEXT.CONTINUATION APPROVEDOMSNO.31504104EXPIRES.4/30/92ESTIMATED bURDENPERAESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST)500HRS.FORWARDCOMMENTSREGARDING SURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP430).U.S.NUCLEARREGULATORY COMMISSION.
WASHINGTON.
OC20555,ANDTO1HEPAPERWORK REDUCTION PAO/ECT13150410i)i OFFICEOFMANAGEMENT ANDSUDQET,WASHINGTON.
DC20503.FACILITYNAMEl1)DOCXETNUMSER(21LERNUMSERIS)~AGE13)D,C.CookPlant-Unit2TEXT///verePPPCP)I/Pquia/,MPP//I/bbP//YRC
%%dnt)30SA'P/)IT)osooo316YEAR9.0SEQUENTIAL NUMKll@002.'-REVISIONNUM9II000OF10Localobservation verifiedsubstantial quantities ofwaterandsteambeingdischarged fromtheventstackfromT0untilMSIVstemtravelbegan.TwooftheMSIV'sexhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.'Following eachMSIVfailure,theMSIVwasdeclaredinoperable andretested.
Ineachcasetheretestwasanacceptable valueandtheMSIVwasdeclaredoperable(seeattachedtesttable).TheActionRequirements ofTechnical Specification 3.7.1.5werefulfilled atalltimesforModes2and3.WhenanMSIVfai'lureoccurred, animmediate retestdemonstrated thatthevalvewasoperable.
OnJanuary10,1990,itwasrealizedthatthefailureswhichoccurredonJanuary8,1990,werebelievedtohaveexistedduringpoweroperation.
Notification totheNRCwasmadeonJanuary10,1990,reporting thatwewereoutsidetheplants'esign basesonJanuary-8,1990.Atthetimethisnotification wasmade,theMISV'swereoperableperTechnical Specification ActionRequirements forModes2and3operation.
TheMSIV'swereoperablesincethetestingresultedinexpelling thecondensate, fromtheventsideofthevalve'soperating piston.TheMSIV'swouldremainoperableaslongasthevalveswerecycledfrequently enoughtdpreventexcessive amountsofcondensate fromcollecting ontopoftheoperating piston.~TheMSIVtestingconfirmed thattheslower,mainsteamstopvalvestroketimesweresymptomsofanunacceptab1e quantityofcondensate accumulating intheuppervalvevolume;Whenadumpvalveisopenedthecondensate flashestosteam'thiscausesincreased ventingtimeduetodelayingthedevelopment ofsufficient Delta-PacrosstheMSIVpiston,toclosetheMSIV's.A"logical hypothesis wasformulated thatcondensate was'notdrainingdownintothelowervolumethroughthedraintube(seeattacheddrawings) fastenoughtopreventaccumulation intheuppervolume.Actingunderthepremisethatthisflowpathwasinsomewayrestricted, possiblyduetomineraldepositsplatingoutontheinsidediameterofthedraintube,itwasdecidedtoattempttoblow-outthisdraintube.Aprocesswasdevisedtoremove(blow-out) anypossiblerestrictions locatedwithineachMSIVdraintubes.Thiswasaccomplished bymaintaining theMSIVinitsclosedpositionandforapproximately onehourwiththedumpvalvesopen.In'doingso,mainsteamwascapableofforcingitswaypasttheparallelclosuredisc,throughthedraintubeintotheuppervolume,andexhausted outtheventstack.,Itwashopedthatthisexhausted steamwouldbeofsufficient velocitytocarryawayanyrestrictive material.
NACForm395A1509)
NRCFORMSSSAISeS)tU.S.NUCLEAAREGULATORY COMMISSION PLICENSEEEVENTREPORTILER)TEXTCONTINUATION APPAOVEDOMSNO.S)504104E)IPIRES:S/20/02ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPOATSMANAGEMENT BRANCHIPe30).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOTHEPAPERWORK REDUCTION PRO/ECT121504)OS).
OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, OC2050KIrACILITY NAME)1)DOCKETNUMBER)2)LERNUMBERIS)PAGEIS)D.C.CookPlant-Unit2TEXTlllmore<<eoe/ereevrw/,ow//r/orO///RC%%dnIISSSAB/)12)osooo'316YEAR4g90sEovsNTIAL oENVMSSR002IISVISION NVMSN0004.OF10Additional testingwasperformed todetermine ifthemaintenance actionwassuccessful andensure.MSIVoperability.
Thisseriesoftestshadstaggered
'estintervals toensureMSIVoperability w'asmaintained.
OnJanuary11,1990,at0916hours,2-MRV-220 exceededtheallowedclosingtime.AnUnusualEventwasdeclaredasallfour(4)MSIV'sweredeclaredinoperable causingaTechnical Specification 3.0.3shutdown.
Thiswasclassified asa'One-Hour
,Reportable EventandNRCnotification wasmadeat0930hours.AcooldowntoMode5(ColdShutdown) wascommenced.
CAUSEOFEVENTInvestigation revealedthatthefailureof'heMSIV'swascausedbyexcessive condensate accumulation ontheventsideoftheMSIV'operating piston.Theexcessive condensate accumulation wasaresultofthefollowing contributing factors:Insulation LessthanCurrentDesin-Insulation onMSIV,theventpipingandassociated valveswaslessthancurrentdesignspecifications.
Theinsufficient insulation resultedinincreased condensation ratesintheMSIV.2.DumValveSeatLeakaeThequantityofcondensate thatcancollectisrelatedtothemassofsaturated steampermitted toentertheupperequalizing steamvolume.Whensteamisallowedtoescapethisvolume,itwillbereplacedbyadditional saturated steamwhichincreases theDelta-Pandpreventsdrainage.
3.MSIVActuatorDesinThecombinedeffectsofoneandtwoaboveresultedinincreased condensation rates,developing greaterDelta-Pacrosstheoperating pistonthanassumedbydesignduringnormaloperation (MSIV'sinsteady-state openposition).
Therateatwhichcondensate canflowdownfromtheuppervolumethroughthedraintubeislimitedbythediameterofthedraintubeportholes.Condensate willaccumulate withintheupperequalizing volumeifitcannotbedrainedfasterthanitforms.Ifthesteamnippleisinsufficiently sized,aDelta-Pwillexistacrossthepistonrestricting condensate drainage.
NRCFomrSSSAISeS)
NRCFORM355AISJ)91US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEOOM8NO,3150010>>EXPIRES:>>/30/92ESTIMATED 8UROENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI50.0HRS.FORWARDCOMMENTSREGARDING 8URDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP430).U.S.NUCLEARsREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT13150010l).
OFFICEOFMANAGEMENT AND8UDGET,WASHINGTON, DC20503.FACILITYNAME111D.C.CookPlant-Unit2TEXT////>>P/>><<eC>>/1I>>qvnd,uJePI/P5/>>/HJICfcnn38559/)12)DOCKETNUMSER12)os0oo316YEAR90LERNUMSER15),>>jjSEOVENTIAL yg:AEVOONHVM5<<<~+HVM002-00~AGE13)050F10ANALYSES, OFEVENTInadditiontoTechnical Specification 3.7.1.5,slowMSIVclosuretimesaffectTechnical Specification items3.3.2.1,Table3.3-5,5.h(HighSteamLineFlow-LowLowTavg),6.h(SteamLinePressureLow),and7.c(Containment Pressure-High High).Theseitemsusethevalveclosuretimeaspartoftheiroveralltimeresponserequirement.
Examination ofsurveillance datafortheseitemsshowthatitem7.c,steamlineisolation onhigh-high containment pressureinsevenseconds,wouldnotbemet.ThiswasreportedtotheNRConJanuary10,1990,undertheprovisions of10CFR50.72.b.l.ii.B asacondition thatwasoutsideoftheplant'sdesignbasis.Theinvestigation ofthisproblemhasidentified thattheslowerclosuretimeswerecausedbywateraccumulation onthetopofthesteampiston.Withwaterpresent,thepistonmovementisslowedasthewaterflashestosteamduringtheventingprocess.Thewater.accumulation occursovertimeandisalsoaffectedbytheleakagepasttheMSIVdumpvalves.Oncethewaterisremovedfromthetopofthepiston,aswouldoccurduringavalvetest,.aretestconducted immediately thereafter wouldindicatenormalva3veactuation times.Aswaterwouldaccumulate duringoperation, thereisevidencethatthecondition mayhaveexistedpriortothesurveillance.
Thus,itisprobabl'e thatTechnical Specification 4.7.1.5.1 wasnotmet.Westinghouse hasevaluated theconsequences ofincreasing allapplicable Technical Specification responsetimesbythreeseconds,andtheyhaveconcluded thattheFSARacceptance criteriaaremetusingthelongerresponsetimes.Themassandenergyreleasesforanoutsideofcontainment steamlinebreakwerecomparedwiththecurrentFSARvalues,andthe'nvironmental qualification oftheequipment intheaffectedlocations hasnotbeencompromised.
Thus,therehasbeennosignificant degradation ofplantsafetyasaresultoftheincreased MSIVclosuretimes.SinceUnit1hasthesametypeofvalve,anevaluation wasalsoperformed concerning the'impacton.Unit1.Theevaluation concluded thattheMSIV'son,Unit1areconsidered tobeoperableandfullysupportive oftheChapter14accidentanalyses.
Atthelastsurveillances, allTechnical Specifications applicable tosteamlineisolation weremet,andthehistorical dataindicatenopatternofclosuretimedeterioration.
Further,therecentWestinghouse analysisshowsthatsufficient marginexistswithMSIVclosuretimesuchthatplantsafetyisnotcompromised ifthe'system responsetimeisincreased bythreeseconds.Thus,therecenteventsassociated withtheUnit2MSIV'sdonotcauseundueconcernwithrespecttothecontinued safeoperation ofNRCFons355A(5891 NRCFORM344A~14e9)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORTILER)TEXT.CONTINUATION APPROVEOOMSNOl31500)0O ExpIREs:el30)92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCH(P430).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.
DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT131504)104),
OFFICEOFMANAGEMENT ANDSUOGET.WASHINGTON.
DC20503.FACILITYNAME11)DOCKETNUMSER12)YEARLERNUMSER(4)rX<OSEQUENTIAL
?P~WIIEYISION NVMFEAi.rXNVMI'AGE13)D.C.CookPlant-Unit2TEXTNmorea>>ooJrreqond,Irreorroeo'oner HRCformSOD'e))12)osooo31690-002-0006oF10Unit1.Thisconclusion isals'obasedonthebeliefthatthepresentperformance oftheUnit1MSIV'sdonotresultintheprobability orconsequences ofanaccidentbeingincreased, anynewtypeofaccidentbeingcreated,andanyTechnical Specification marginofsafetybeingreduced.CORRECTIVE ACTIONSUponreachingMode5,allfourMSIV'sweredisassembled andavisualexamination performed.
Theseexaminations revealedthatthedraintubeshadnotexperienced anyphysicaldegradation thatcouldhaverestricted thecondensate flowpath.Alldimensions wereverified.
ElectricITEdeFrance(FDF)wascontacted concerning theirapproachatresolving similarcircumstances.
EDFprovidedtheirinvestigation findingsandvalvedesignmodifications.
Weimplemented theEDFrecommendations.
Afterallavailable sourcesofinformation weretechnically evaluated, itwasdetermined thatallUnit2MSIV'swouldbemodifiedviaMinorModification 2-Mf-079.
Underthismodification thediameterofdraintubeportholeswouldbeincreased from1'/8"(0.125")to5mm(0.197")andthediameteroftheequalizing steamnipplewouldbeincreased from1/8"(0.125")'o 10mm(0.394").
Twoperformance relatedfunctions wouldbeimprovedinthismanner.l.Increasing thesizeofthedraintubeportholesprovid'es alargerareatoimprovecondensate flowthroughtheactuatorpiston.2.Increasing thesizeoftheequalizing steamnipplewillprovidealessrestrictive pathforsteamtopassupthroughthepistontomaintainequilibrium andpreventsteamfrompassingthroughthedraintubeandinhibitdrainage.
Itwasalsodiscovered atthistimethattheinsulation ontheMSIV,ventpipingandassociated valveswaslessthanthecurrentdesignspecification requirements..
Thiscontributed toalargervarianceintemperature (Delta-T) resulting inmoreheattransferandincreasing thecondensation rate.Aftercompleting allmodifications andreassembling the,MSIV's, SpecialProcedure 2-THP.SP.MM-079 wasusedtoverifyoperability.
Thisprocedure includedaseriesoftestcyclesforallMSIV'satdifferent intervals withtheappropriate instrumentation requiredtomeasureandrecordallapplicable performance variables, specifically therateofpressuredropintheventline.NRCForm344AI5$9)P NRCFORMSSSA(5JISIU.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMSNO.S1500104EXPIRES:A/SO/52ESTIMATED SUROENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING SURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP5201.U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.
DC20555.ANDTOTHEPAPERWORK REDUCTION PROJECT(S(5041(M).
OFFICEOFMANAGEMENT ANDSUDGET,WASHINGTON, OC20502,FACILITYNAME(1)DOCKETNUMSER(21YEARLERNUMSER(5)YP>',SSQVSNTIA'L NVMSllII5YISIONNVMSA~AGELSID.C.CookPlant-Unit2TEXTIIImcmapeceJIIPSw'wI,PPPaAWonVHRCRPmI~SI(12(oso0031690002I-00070F10Theacceptance criteriausedwithin'2-THP.SP.MM-079 wastwofold.First,eachfullclosurestroketimemustbewithin5secondsinaccordance withTechnical Specification 3.7.1.5.Second,therateofpressure, dropintheventlinemustnotchangeasthetestintervalisextendedto24hours.Thissecondcriteriawasusedtoverifynoadditional condensate hadaccumulated withintheuppersteamvolumethatcouldlengthenstroketimeanddelaystemtraveluponflashingtosteamduringtheventingprocess.Allstroketestsperformed inaccordance with2-THP.SP.MM-079, exceptthefirsttestonMRV-210,provided.acceptable resultsandverifiedthegenericcondensate issue.hadbeenresolved; Theiniti'altestperformed onMRV-210failed.Thecorresponding rateofpressuredropintheventlinesignature verifiedsignificant quantities ofcondensate stillpresent.Investigation
.revealedthatTrainBDumpValveMRV-212wasnotse'stingproperlypermitting asignificant amountof-steamtobeexhausted outtheventstack.Underthesecircumstances, additional steamwasbroughtintotheuppervolumewithcondensate collecting ataratefasterthancouldbedrained.MRV-212wasrepairedandsubsequent closuretestscompleted onMRV-210verifiedthatthis.isolated incidenthadbeenresolved.
AllMSIV'swerereturnedtoanoperablestatusandUnit2returnedtopoweroperation.
Asstatedintheanalysis, wedonotexpecttoencounter similardifficulties withtheUnit1MSIV's.However,wearecurrently addinginsulation totheUnit1MSIV's,ventlinesandvalvestoenhancetheMSIVoperating conditions.
IFAILEDCOMPONENT IDENTIFICATION Component ID:MainSteamIsolation Valves2-MRV-210, 2-MRV-220, 2-MRV-240 Manufacturer:
Hopkinsons
-FerrantiModel:2379WPREVIOUSSIMILAREVENTS050-316/83-57 NRCFormSSSA(SSSI NRCFORM344A<Se9)LICENSEEEVENTREPORT{LERITEXTCONTINUATION t~APPROVEO 0MBNO.31500104EXPIRES)4/30/93 ESTIMATED SURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION RFOUESTI500HRS.FORWARDCOMMENTSREGARDING SURDENESTIMATETOTHERFCORDSANDREPORTSMANAGEMENT BRANCHIPS30),U.S,NUCLEARREGULATORY COMMISSION, WASHINGTON, DC30555,ANDTOTHEPAPERWORK REDUCTION PROJECT131504))041-OFFICE OFMANAGEMFNT ANDSUDGET,WASHINGTON.
DC30503.fACILITYNAMEIl)DOCKETNUMSER)3)YEARLERNUMSER)4)SCOVCNTIAL NVMCRIICVISION NVMCA~AGE13)D.C.CookPlant-Unit2TEXTlllmorpgfdcglgnqvssd,we~HRCJtgwiiSRSC'4)(17)oeo0o316900020008oF10MAINSTEAMISOLATION VALVETESTTABLEJanuar8,1990TestinVALVEINITIALCLOSINGTIME(SEC)RETEST(SEC)2-MRV-210
=2-IIRV-240 5.945.183.011.95'Januar~9,1990Testin2-MRV-210 2-MRV-220 2-MRV-240 5.075.605.05"2.832.282.21Januar10,1990Testin2-MRV-210 2-MRV-220 5.785.733.082.55'anuar11,1990Testing2-MJRV-220 5.26NoRetestPerformed NOTE:Duringthetestprogram2-HRV-230 closingtimeswerehigh,hut'didnotexceedtheTechnical Specification LimitoffiveSeconds.NRCFoIIm344A144)9)
NRCFORM364A1640)FACILITYNAME111US.NUCLEARAEGULATOAY COMMISSION LICENSEEEVENTREPORTILER)TEXTCONTINUATION DoerETNUMSER(2)APPAOVEDOMSNO,31500)04EXPIRE5:4/30/02ESTIMATED SUADENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGAROINO SUADENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP430).U.S.NUCLEARREGULATORY COMMISSION.
WASHINGTON.
OC20655,ANDTO1HEPAPERWORK REDUCTION PRO/ECT13)50410E).'OFFICE
~OFMANAGEMENT ANDSUOGET,WASHINGTON, DC10503.PAGEIS)LEANUMSER(4)D..C.CookPlant-Unit2,TEXT///nxros/>>ce/sr)V/rer/1>>e~PT/Or>>/HIICFerrrrAXLES/(17)YEARosooo31690SEQUENTIAL NVM4II002HEY>>ION)rvMER00'09QF10tMAINSTEAMISOLATION VALVENOTE:VALVESHOWNINCLOSEDPOSITIONOPERATING PISTON~VENTLINETOSTEANDUMPVALVESSTEAMNIPPLECONDENSATE DRAINLINECONDENSATE DRAINPORTVALVEMODIFICATIONS CONDENSATE DRAINPORTINITIALLY
-0125"MODIFIEDTO-.0..'197" (5MM)STEAMNIPPLEINITIALLY "0'125"MODIFI'ED TO0.394"(10MM)~~4/g,.NRCForm346A(680)
NRCFORM385A(54ISIU.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMSNO.315040104 EXPIRES;4I30JS3ESTIMATED SURQENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLL'ECTION REQUEST:50.0MRS.FQRWARQCOMMENTSREOAROINO bUROEHESTIMATETOTHERECORDSANDREPORTSMANAOEMEHT SRANCHIf@30).U.S.NUCLEARREOULATORY COMMISSION.
WASHINOTOH, DC30555,AHQTQ1HEfAPFRWORKREDUCTION PROJECT131504)104),
QffICEOFMANAGEMENT AHDSUDOET,WASHINGTON, DC30503,fACILITYNAMEIl)DOCKETNUMSER13)YEARLERNUMSERIblSEOVENTIAL NVMSEIIII5VISIONNVM~IIPACEISID.C.CookPlant-Unit2TEXTIllII>>IFZ>>ceJFIP0vbe4uwFIRRSN>>FJYRC%%dYm~3Il)T),osooo3l6900020010OF]0HAINSTEAMISOLATION VALVEVENTPIPINGVENTSTOATMOSPHERE DUMPVALVES3-WAYMOTOROPERATEDVALVEMSIVHRCF~SeSAISJISI}}

Revision as of 08:49, 29 June 2018

LER 90-002-00:on 900108,two MSIVs Exhibited Closing Time in Excess of Tech Spec 3.7.1.5 Limit of 5 S.On 900109 & 10, Confirmed That Excessive Condensation Collected on Vent Side.Caused by Inadequate insulation.W/900209 Ltr
ML17328A584
Person / Time
Site: Cook American Electric Power icon.png
Issue date: 02/09/1990
From: BLIND A A, DROSTE J B
INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-002, LER-90-2, NUDOCS 9002280017
Download: ML17328A584 (12)
v • d • e


Text

ACCELERATEDD1BUTl0NDE}d04STATIONSYSI'EMREGULATOINFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9002280017

'OC.DATE:

90/02/09NOTARIZED:

NODOCKETIFACIL:50-316 DonaldC.CookNuclearPowerPlant,Unit2,Indiana&05000316AUTH.NAME'UTHORAFFILiATION DROSTE,J.B.

IndianaMichiganPowerCo.(formerly Indiana&MichiganEleBLIND,A.A.

IndianaMichiganPowerCo.(formerly Indiana&MichiganEleRECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER90-002-00:on 900110,MSIV inoperability duetocondensate accumulation onventsideofoperating piston.W/8ltr.DZSTRZBOTZON CODE:ZE22TCOPZESRECEZVED:LTR jENCL[SZSE:TITLE:50.73/50.9 LicenseeEventReport(LER),Incidenti Rpt,etc.NOTES:RECIPIENT XDCODE/NAME PD3-1LAGIITTER,J.

INTERNAL:

ACNWAEOD/DSP/TPAB DEDRONRR/DET/EMEB9H3 NRR/DLPQ/LHFB11 NRR/DOEA/OEABll NRR/DST/SELB 8DNRRQ~R/LB8DlEGFXL02RGN3FILE01COPIESLTTRENCL111122111111111111111111~RECIPIENT IDCODE/NAME PD3-1PDAEOD/DOAAEOD/ROAB/DSP NRR/DET/ECMB 9HNRR/DET/ESGB 8DNRR/DLPQ/LPEB10 NRR/DREP/PRPB11 NRR/DST/SICB 7ENRR/DST/SRXB 8ERES/DSIR/EIB COPIESLTTRENCL11112211111122111111hDS44111111NOIR'IOALL'RICS"KXIPIBGSEXTERNALEG&GWILLIAMSESLPDRNSICMAYS,GNUDOCSFULLTXTLSTLOBBYWARDNRCPDRNSICMURPHYgGA111111RIDSDDSPIZASEHELPUSIOREVXZ%RKE!CGKPACT'IHEDOCXMWZCOWEDDESK-,LXSTSFORDOCUMEMIS YOUDC%ITNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPXESREQUIRED:

LTTR35ENCI35 IndianaMichiganPowerCompanyCookNuclearPlantP.O.Box"58.Bndgman.

Ml'91066164655901INDIANANICHIGANPOWERFebruary9,1990UnitedStatesNuclearRegulatory Commission

.Document ControlDeskRockville, Maryland20852Operating LicenseDPR-74DocketNo.50-316DocumentControlManager:Inaccordance, withthecriteriaestablished by10CFR50.73entitledLicenseeEvent,ReortinSystem,thefollowing reportisbeingsubmitted:

90-002-00 Sincerely, A.A.BlindPlantManagerAAB:clwAttachment ccD.H.Williams, Jr.A.B.Davis,RegionIIIM.P.AlexichP.A.BarrettJ.E.BorggrenR.F.KroegerNRCResidentInspector J.G.Giitter,NRCR.C.CallenG.Charnoff, Esg.DottieSherman,ANILibraryD.HahnINPOS.J.Brewer/B.P.

Lauzau@00224<00/7

+00209PDRADOCI0<00031bPDr:

NRCFORM366(689)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORTILER)APPROVEDOMBNO.31504104EXPIRES:4/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLFCTION REQUEST:50.0HRS,FORWARDCOMMENTSAEGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P630),V.S.NUCLEARREGULATOAY COMMISSION, WASHINGTON, DC20555.ANDTOTHEPAPERWORK REDUCTION PROJECT(31500104).

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, OC20503.FACILITYNAME(I)D.C.CookPlant-Unit2DOCKETNUMBER(2)PAE050003161OF1"PTITLE<<IMainSteamIsolation" ValveInoperaiity-DuetoConensateAccumulation onVentSideofOperating PistonEVENTDATK(5)LERNUMBER(41REPORTDATE,(7)OTHERFACILI'TIES INVOLVED(4)MONTHDAYYEARYEARSEQUENTIAL NVMSEtlreIIEVISION NVMSEIIMONTHOAYYEARFACILITYNAMESCookPlant-Unit1DOCKETNUMBER(SI 05000315011090900020002099005000OPERATINGMODEIS)3POWERLEVELppp20.402(SI 20.4051~I(lI(ll20406(~)(1)(lll20.405(~I(II(IIl)20.406(el(II(NI 20.405(~l(l)(vlX20.405(c) 50.34(cl(l I50.34(cl(2)60.73(el(2)(I)60.73(e)(2)(S) 50.73(el(2)Ill))LICENSEECONTACTFOATHISLER(12I50.73(el(2)(lv) 50.73(el(2llv)'0.73(el(2)(vSI

.50.73lel(2)(vSI)(AI

'0.73(e)12)(el)I I(5)50,73(~I(2I(eITHISREPORTISSUBMITTED PURSUANTT0THEREQUIREMENTS OF10CFR('):(Cntceontormortotrntlottowrnd)

(1173.7)(S)73.71(c)OTHKR(SptcrryinAprtrtctStrowtndinTerI,HRCForm3ddAINAMEJ.B.Droste--Technical Engineering Superintendent AREACODETELEPHONE NUMBER616465-5901COMPLETEONE(.INEFOAEACHCOMPONENT FAILUREDKSCRIBED INTHISREPORT(13)CAUSESYSTEM\'COMPONENT MANUFACTVREREPORTABLE TONPRDSCAUSESYSTEMCOMPONENT MANUFACTVRERBSBVTVX999.Y'Prr.,~4.NXrr.r..SUPPLEMENTAL REPORTEXPECTED(14)YEStttytr,comprtrtFXPECFEDSVSMISSION DAFEIXABS'TAACT tLimrtrott00Iptctt,r,t.,tpprorimtttiy trttttntin(littoterryptwrirttn tmttt(14)FXPECTED'UbMISSION DATE(ISIMONTHDAYYEAROnJanuary8,1990withUnit2inMode3-(HotStandby)surveillance testingoftheMainSteamIsolation Valves(MSIV's)wasconducted.

TwoMSIV'sexhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.Thiscondit'ion isbelieved.tohave,existedduringpoweroperation.

Additional MSIVtestingonJanuary9,and10,1990confirmed thatexcessive condensation wascollecting ontheventsideoftheMSIVoperating piston.Whenthedumpvalveswereopenedtovent-offsteamfromtheMSIVoperating piston,theaccumulated condensate wouldflashtosteamandresultinincreased MSIVclosuretimes.Following anefforttoblowouttheMSIVcondensate draintubes,aseriesoftestswereperformed atvarioustimeintervals.

todetermine ifthecondensate problemhadbeenresolvedandverifyMSIVoperability.

Withthefailureof2-MRV-220 onJanuary11,1990,at0916hours,itwasevidentthatthecondensate p'roblemwasstillpresent.AllMSIV'sweredeclaredinoperable.and anUnusualEventwasdeclared.

AcooldowntoMode5(ColdShutdown) wasstarted.Repairactivities includeddisassembly oftheMSIV'stoenlargethecondensate draintubeportandtheequalizing steamnipple.Additional insulation wasplacedontheMSIV's,ventpipingandvalves.NRCForm366(669)

NRCFORM366A(6J)9)V.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION" APPROVEDOMBNO.31500)OSEXPIRES:S/30/92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT BRANCH(P430).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, OC20555.ANDTOTHEPAPFRWORK REDUCTION PROJECT(3(500104).

OFFICEOFMANAGEMENT ANDBUDGET.WASHINGTON, OC20503.FACILITYNAME(1)DOCKETNUMBER(2)YEARLERNUMBER(6)SEQVENTIAL NVMEERREVISIONNVMSERPAGE(3)-D.C.CookPlant-Unit2TEXT///morespeceiereqvirN/.

Irse~HRC%%drm3(SEA's/(12)osooo316900020000CONDITIONS PRIORTOOCCURRENCE Unit2inMode3(HotStandby).

DESCRIPTION OFEVENTOnJanuary8,1990,surveillance testingoftheMainSteamIsolation Valves(MSIV'-s)

(EIIS/SB-ISV) wasconducted.

TwooftheMSIV'sexhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.Following eachMSIVfailure,theMSIVwasdeclaredinoperable andimmediately retested.

Inbothcasestheretestdemonstrated thevalveclosedwithintheTechnical Specification timelimitandthe,MSIVwasdeclaredoperable.

Additional testswereconducted onJanuary9,1990.Asubstantial amountofwaterwasobservedtoflashoutofthedumpvalve(EIIS/SB-VTV) ventstacksduringthefirst'est ofeachMSIV.ThreeMSIV's.exhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.Following eachMSIVfailure,theMSIVwasdeclaredinoperable andretested.

In-eachcasetheretestdemonstrated thevalveclosedwithintheTechnical Specification timelimitandtheMSIV'sweredeclaredoperable.

(Seeattachedtesttable).TheJanuary9,1990testingverifiedthatenoughcondensation couldaccumulate ontheventsideofthepistonwithina24hourperiodto'enderthevalveinoperable.

Unit2washeldinMode3tofurtherdiagnosetherootcauseofthisissue.5Sec.6Sec.TIMECONTROLROOMSWITCHACTUATION TOLIGHTMSIVSTEMTRAVELOnJanuary10,'1990,aseriesofdiagnostic testswereperformed todetermine theextentthatcondensate withintheMSIVoperating cylindervolumecouldaffectMSIVstroketime.Astripchartwasusedtorecordpressurewithinthevolumeasafunctionoftime.Closuretimewasmeasuredinthecontrolroom,measuring thetimefromthedumpvalveswitchactuation untiltheMSIVvalvelightindicated thevalvewasclosed.MSIVstemtraveltimewasmeasuredlocally.Thefollowing time.lineissimilartoeachMSIVtestedandrepresents typicalcircumstances experienced byallMSIV's.01Sec:2Sec.3Sec.4Sec.FLASHINGrNRCForm366A(669)

NRCFORM355A~)549)U.S.NUCLKARREGULATORY COIAMISSION LICENSEEEVENTREPORTILER)TEXT.CONTINUATION APPROVEDOMSNO.31504104EXPIRES.4/30/92ESTIMATED bURDENPERAESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST)500HRS.FORWARDCOMMENTSREGARDING SURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP430).U.S.NUCLEARREGULATORY COMMISSION.

WASHINGTON.

OC20555,ANDTO1HEPAPERWORK REDUCTION PAO/ECT13150410i)i OFFICEOFMANAGEMENT ANDSUDQET,WASHINGTON.

DC20503.FACILITYNAMEl1)DOCXETNUMSER(21LERNUMSERIS)~AGE13)D,C.CookPlant-Unit2TEXT///verePPPCP)I/Pquia/,MPP//I/bbP//YRC

%%dnt)30SA'P/)IT)osooo316YEAR9.0SEQUENTIAL NUMKll@002.'-REVISIONNUM9II000OF10Localobservation verifiedsubstantial quantities ofwaterandsteambeingdischarged fromtheventstackfromT0untilMSIVstemtravelbegan.TwooftheMSIV'sexhibited aclosingtimeinexcessoftheTechnical Specification 3.7.1.5limitoffiveseconds.'Following eachMSIVfailure,theMSIVwasdeclaredinoperable andretested.

Ineachcasetheretestwasanacceptable valueandtheMSIVwasdeclaredoperable(seeattachedtesttable).TheActionRequirements ofTechnical Specification 3.7.1.5werefulfilled atalltimesforModes2and3.WhenanMSIVfai'lureoccurred, animmediate retestdemonstrated thatthevalvewasoperable.

OnJanuary10,1990,itwasrealizedthatthefailureswhichoccurredonJanuary8,1990,werebelievedtohaveexistedduringpoweroperation.

Notification totheNRCwasmadeonJanuary10,1990,reporting thatwewereoutsidetheplants'esign basesonJanuary-8,1990.Atthetimethisnotification wasmade,theMISV'swereoperableperTechnical Specification ActionRequirements forModes2and3operation.

TheMSIV'swereoperablesincethetestingresultedinexpelling thecondensate, fromtheventsideofthevalve'soperating piston.TheMSIV'swouldremainoperableaslongasthevalveswerecycledfrequently enoughtdpreventexcessive amountsofcondensate fromcollecting ontopoftheoperating piston.~TheMSIVtestingconfirmed thattheslower,mainsteamstopvalvestroketimesweresymptomsofanunacceptab1e quantityofcondensate accumulating intheuppervalvevolume;Whenadumpvalveisopenedthecondensate flashestosteam'thiscausesincreased ventingtimeduetodelayingthedevelopment ofsufficient Delta-PacrosstheMSIVpiston,toclosetheMSIV's.A"logical hypothesis wasformulated thatcondensate was'notdrainingdownintothelowervolumethroughthedraintube(seeattacheddrawings) fastenoughtopreventaccumulation intheuppervolume.Actingunderthepremisethatthisflowpathwasinsomewayrestricted, possiblyduetomineraldepositsplatingoutontheinsidediameterofthedraintube,itwasdecidedtoattempttoblow-outthisdraintube.Aprocesswasdevisedtoremove(blow-out) anypossiblerestrictions locatedwithineachMSIVdraintubes.Thiswasaccomplished bymaintaining theMSIVinitsclosedpositionandforapproximately onehourwiththedumpvalvesopen.In'doingso,mainsteamwascapableofforcingitswaypasttheparallelclosuredisc,throughthedraintubeintotheuppervolume,andexhausted outtheventstack.,Itwashopedthatthisexhausted steamwouldbeofsufficient velocitytocarryawayanyrestrictive material.

NACForm395A1509)

NRCFORMSSSAISeS)tU.S.NUCLEAAREGULATORY COMMISSION PLICENSEEEVENTREPORTILER)TEXTCONTINUATION APPAOVEDOMSNO.S)504104E)IPIRES:S/20/02ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPOATSMANAGEMENT BRANCHIPe30).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTOTHEPAPERWORK REDUCTION PRO/ECT121504)OS).

OFFICEOFMANAGEMENT ANDBUDGET,WASHINGTON, OC2050KIrACILITY NAME)1)DOCKETNUMBER)2)LERNUMBERIS)PAGEIS)D.C.CookPlant-Unit2TEXTlllmore<<eoe/ereevrw/,ow//r/orO///RC%%dnIISSSAB/)12)osooo'316YEAR4g90sEovsNTIAL oENVMSSR002IISVISION NVMSN0004.OF10Additional testingwasperformed todetermine ifthemaintenance actionwassuccessful andensure.MSIVoperability.

Thisseriesoftestshadstaggered

'estintervals toensureMSIVoperability w'asmaintained.

OnJanuary11,1990,at0916hours,2-MRV-220 exceededtheallowedclosingtime.AnUnusualEventwasdeclaredasallfour(4)MSIV'sweredeclaredinoperable causingaTechnical Specification 3.0.3shutdown.

Thiswasclassified asa'One-Hour

,Reportable EventandNRCnotification wasmadeat0930hours.AcooldowntoMode5(ColdShutdown) wascommenced.

CAUSEOFEVENTInvestigation revealedthatthefailureof'heMSIV'swascausedbyexcessive condensate accumulation ontheventsideoftheMSIV'operating piston.Theexcessive condensate accumulation wasaresultofthefollowing contributing factors:Insulation LessthanCurrentDesin-Insulation onMSIV,theventpipingandassociated valveswaslessthancurrentdesignspecifications.

Theinsufficient insulation resultedinincreased condensation ratesintheMSIV.2.DumValveSeatLeakaeThequantityofcondensate thatcancollectisrelatedtothemassofsaturated steampermitted toentertheupperequalizing steamvolume.Whensteamisallowedtoescapethisvolume,itwillbereplacedbyadditional saturated steamwhichincreases theDelta-Pandpreventsdrainage.

3.MSIVActuatorDesinThecombinedeffectsofoneandtwoaboveresultedinincreased condensation rates,developing greaterDelta-Pacrosstheoperating pistonthanassumedbydesignduringnormaloperation (MSIV'sinsteady-state openposition).

Therateatwhichcondensate canflowdownfromtheuppervolumethroughthedraintubeislimitedbythediameterofthedraintubeportholes.Condensate willaccumulate withintheupperequalizing volumeifitcannotbedrainedfasterthanitforms.Ifthesteamnippleisinsufficiently sized,aDelta-Pwillexistacrossthepistonrestricting condensate drainage.

NRCFomrSSSAISeS)

NRCFORM355AISJ)91US.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEOOM8NO,3150010>>EXPIRES:>>/30/92ESTIMATED 8UROENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUESTI50.0HRS.FORWARDCOMMENTSREGARDING 8URDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP430).U.S.NUCLEARsREGULATORY COMMISSION, WASHINGTON, DC20555,ANDTO1HEPAPERWORK REDUCTION PROJECT13150010l).

OFFICEOFMANAGEMENT AND8UDGET,WASHINGTON, DC20503.FACILITYNAME111D.C.CookPlant-Unit2TEXT////>>P/>><<eC>>/1I>>qvnd,uJePI/P5/>>/HJICfcnn38559/)12)DOCKETNUMSER12)os0oo316YEAR90LERNUMSER15),>>jjSEOVENTIAL yg:AEVOONHVM5<<<~+HVM002-00~AGE13)050F10ANALYSES, OFEVENTInadditiontoTechnical Specification 3.7.1.5,slowMSIVclosuretimesaffectTechnical Specification items3.3.2.1,Table3.3-5,5.h(HighSteamLineFlow-LowLowTavg),6.h(SteamLinePressureLow),and7.c(Containment Pressure-High High).Theseitemsusethevalveclosuretimeaspartoftheiroveralltimeresponserequirement.

Examination ofsurveillance datafortheseitemsshowthatitem7.c,steamlineisolation onhigh-high containment pressureinsevenseconds,wouldnotbemet.ThiswasreportedtotheNRConJanuary10,1990,undertheprovisions of10CFR50.72.b.l.ii.B asacondition thatwasoutsideoftheplant'sdesignbasis.Theinvestigation ofthisproblemhasidentified thattheslowerclosuretimeswerecausedbywateraccumulation onthetopofthesteampiston.Withwaterpresent,thepistonmovementisslowedasthewaterflashestosteamduringtheventingprocess.Thewater.accumulation occursovertimeandisalsoaffectedbytheleakagepasttheMSIVdumpvalves.Oncethewaterisremovedfromthetopofthepiston,aswouldoccurduringavalvetest,.aretestconducted immediately thereafter wouldindicatenormalva3veactuation times.Aswaterwouldaccumulate duringoperation, thereisevidencethatthecondition mayhaveexistedpriortothesurveillance.

Thus,itisprobabl'e thatTechnical Specification 4.7.1.5.1 wasnotmet.Westinghouse hasevaluated theconsequences ofincreasing allapplicable Technical Specification responsetimesbythreeseconds,andtheyhaveconcluded thattheFSARacceptance criteriaaremetusingthelongerresponsetimes.Themassandenergyreleasesforanoutsideofcontainment steamlinebreakwerecomparedwiththecurrentFSARvalues,andthe'nvironmental qualification oftheequipment intheaffectedlocations hasnotbeencompromised.

Thus,therehasbeennosignificant degradation ofplantsafetyasaresultoftheincreased MSIVclosuretimes.SinceUnit1hasthesametypeofvalve,anevaluation wasalsoperformed concerning the'impacton.Unit1.Theevaluation concluded thattheMSIV'son,Unit1areconsidered tobeoperableandfullysupportive oftheChapter14accidentanalyses.

Atthelastsurveillances, allTechnical Specifications applicable tosteamlineisolation weremet,andthehistorical dataindicatenopatternofclosuretimedeterioration.

Further,therecentWestinghouse analysisshowsthatsufficient marginexistswithMSIVclosuretimesuchthatplantsafetyisnotcompromised ifthe'system responsetimeisincreased bythreeseconds.Thus,therecenteventsassociated withtheUnit2MSIV'sdonotcauseundueconcernwithrespecttothecontinued safeoperation ofNRCFons355A(5891 NRCFORM344A~14e9)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORTILER)TEXT.CONTINUATION APPROVEOOMSNOl31500)0O ExpIREs:el30)92ESTIMATED BURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCH(P430).U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.

DC20555,ANDTOTHEPAPERWORK REDUCTION PROJECT131504)104),

OFFICEOFMANAGEMENT ANDSUOGET.WASHINGTON.

DC20503.FACILITYNAME11)DOCKETNUMSER12)YEARLERNUMSER(4)rX<OSEQUENTIAL

?P~WIIEYISION NVMFEAi.rXNVMI'AGE13)D.C.CookPlant-Unit2TEXTNmorea>>ooJrreqond,Irreorroeo'oner HRCformSOD'e))12)osooo31690-002-0006oF10Unit1.Thisconclusion isals'obasedonthebeliefthatthepresentperformance oftheUnit1MSIV'sdonotresultintheprobability orconsequences ofanaccidentbeingincreased, anynewtypeofaccidentbeingcreated,andanyTechnical Specification marginofsafetybeingreduced.CORRECTIVE ACTIONSUponreachingMode5,allfourMSIV'sweredisassembled andavisualexamination performed.

Theseexaminations revealedthatthedraintubeshadnotexperienced anyphysicaldegradation thatcouldhaverestricted thecondensate flowpath.Alldimensions wereverified.

ElectricITEdeFrance(FDF)wascontacted concerning theirapproachatresolving similarcircumstances.

EDFprovidedtheirinvestigation findingsandvalvedesignmodifications.

Weimplemented theEDFrecommendations.

Afterallavailable sourcesofinformation weretechnically evaluated, itwasdetermined thatallUnit2MSIV'swouldbemodifiedviaMinorModification 2-Mf-079.

Underthismodification thediameterofdraintubeportholeswouldbeincreased from1'/8"(0.125")to5mm(0.197")andthediameteroftheequalizing steamnipplewouldbeincreased from1/8"(0.125")'o 10mm(0.394").

Twoperformance relatedfunctions wouldbeimprovedinthismanner.l.Increasing thesizeofthedraintubeportholesprovid'es alargerareatoimprovecondensate flowthroughtheactuatorpiston.2.Increasing thesizeoftheequalizing steamnipplewillprovidealessrestrictive pathforsteamtopassupthroughthepistontomaintainequilibrium andpreventsteamfrompassingthroughthedraintubeandinhibitdrainage.

Itwasalsodiscovered atthistimethattheinsulation ontheMSIV,ventpipingandassociated valveswaslessthanthecurrentdesignspecification requirements..

Thiscontributed toalargervarianceintemperature (Delta-T) resulting inmoreheattransferandincreasing thecondensation rate.Aftercompleting allmodifications andreassembling the,MSIV's, SpecialProcedure 2-THP.SP.MM-079 wasusedtoverifyoperability.

Thisprocedure includedaseriesoftestcyclesforallMSIV'satdifferent intervals withtheappropriate instrumentation requiredtomeasureandrecordallapplicable performance variables, specifically therateofpressuredropintheventline.NRCForm344AI5$9)P NRCFORMSSSA(5JISIU.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMSNO.S1500104EXPIRES:A/SO/52ESTIMATED SUROENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGARDING SURDENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP5201.U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON.

DC20555.ANDTOTHEPAPERWORK REDUCTION PROJECT(S(5041(M).

OFFICEOFMANAGEMENT ANDSUDGET,WASHINGTON, OC20502,FACILITYNAME(1)DOCKETNUMSER(21YEARLERNUMSER(5)YP>',SSQVSNTIA'L NVMSllII5YISIONNVMSA~AGELSID.C.CookPlant-Unit2TEXTIIImcmapeceJIIPSw'wI,PPPaAWonVHRCRPmI~SI(12(oso0031690002I-00070F10Theacceptance criteriausedwithin'2-THP.SP.MM-079 wastwofold.First,eachfullclosurestroketimemustbewithin5secondsinaccordance withTechnical Specification 3.7.1.5.Second,therateofpressure, dropintheventlinemustnotchangeasthetestintervalisextendedto24hours.Thissecondcriteriawasusedtoverifynoadditional condensate hadaccumulated withintheuppersteamvolumethatcouldlengthenstroketimeanddelaystemtraveluponflashingtosteamduringtheventingprocess.Allstroketestsperformed inaccordance with2-THP.SP.MM-079, exceptthefirsttestonMRV-210,provided.acceptable resultsandverifiedthegenericcondensate issue.hadbeenresolved; Theiniti'altestperformed onMRV-210failed.Thecorresponding rateofpressuredropintheventlinesignature verifiedsignificant quantities ofcondensate stillpresent.Investigation

.revealedthatTrainBDumpValveMRV-212wasnotse'stingproperlypermitting asignificant amountof-steamtobeexhausted outtheventstack.Underthesecircumstances, additional steamwasbroughtintotheuppervolumewithcondensate collecting ataratefasterthancouldbedrained.MRV-212wasrepairedandsubsequent closuretestscompleted onMRV-210verifiedthatthis.isolated incidenthadbeenresolved.

AllMSIV'swerereturnedtoanoperablestatusandUnit2returnedtopoweroperation.

Asstatedintheanalysis, wedonotexpecttoencounter similardifficulties withtheUnit1MSIV's.However,wearecurrently addinginsulation totheUnit1MSIV's,ventlinesandvalvestoenhancetheMSIVoperating conditions.

IFAILEDCOMPONENT IDENTIFICATION Component ID:MainSteamIsolation Valves2-MRV-210, 2-MRV-220, 2-MRV-240 Manufacturer:

Hopkinsons

-FerrantiModel:2379WPREVIOUSSIMILAREVENTS050-316/83-57 NRCFormSSSA(SSSI NRCFORM344A<Se9)LICENSEEEVENTREPORT{LERITEXTCONTINUATION t~APPROVEO 0MBNO.31500104EXPIRES)4/30/93 ESTIMATED SURDENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION RFOUESTI500HRS.FORWARDCOMMENTSREGARDING SURDENESTIMATETOTHERFCORDSANDREPORTSMANAGEMENT BRANCHIPS30),U.S,NUCLEARREGULATORY COMMISSION, WASHINGTON, DC30555,ANDTOTHEPAPERWORK REDUCTION PROJECT131504))041-OFFICE OFMANAGEMFNT ANDSUDGET,WASHINGTON.

DC30503.fACILITYNAMEIl)DOCKETNUMSER)3)YEARLERNUMSER)4)SCOVCNTIAL NVMCRIICVISION NVMCA~AGE13)D.C.CookPlant-Unit2TEXTlllmorpgfdcglgnqvssd,we~HRCJtgwiiSRSC'4)(17)oeo0o316900020008oF10MAINSTEAMISOLATION VALVETESTTABLEJanuar8,1990TestinVALVEINITIALCLOSINGTIME(SEC)RETEST(SEC)2-MRV-210

=2-IIRV-240 5.945.183.011.95'Januar~9,1990Testin2-MRV-210 2-MRV-220 2-MRV-240 5.075.605.05"2.832.282.21Januar10,1990Testin2-MRV-210 2-MRV-220 5.785.733.082.55'anuar11,1990Testing2-MJRV-220 5.26NoRetestPerformed NOTE:Duringthetestprogram2-HRV-230 closingtimeswerehigh,hut'didnotexceedtheTechnical Specification LimitoffiveSeconds.NRCFoIIm344A144)9)

NRCFORM364A1640)FACILITYNAME111US.NUCLEARAEGULATOAY COMMISSION LICENSEEEVENTREPORTILER)TEXTCONTINUATION DoerETNUMSER(2)APPAOVEDOMSNO,31500)04EXPIRE5:4/30/02ESTIMATED SUADENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLLECTION REQUEST:500HRS.FORWARDCOMMENTSREGAROINO SUADENESTIMATETOTHERECORDSANDREPORTSMANAGEMENT SRANCHIP430).U.S.NUCLEARREGULATORY COMMISSION.

WASHINGTON.

OC20655,ANDTO1HEPAPERWORK REDUCTION PRO/ECT13)50410E).'OFFICE

~OFMANAGEMENT ANDSUOGET,WASHINGTON, DC10503.PAGEIS)LEANUMSER(4)D..C.CookPlant-Unit2,TEXT///nxros/>>ce/sr)V/rer/1>>e~PT/Or>>/HIICFerrrrAXLES/(17)YEARosooo31690SEQUENTIAL NVM4II002HEY>>ION)rvMER00'09QF10tMAINSTEAMISOLATION VALVENOTE:VALVESHOWNINCLOSEDPOSITIONOPERATING PISTON~VENTLINETOSTEANDUMPVALVESSTEAMNIPPLECONDENSATE DRAINLINECONDENSATE DRAINPORTVALVEMODIFICATIONS CONDENSATE DRAINPORTINITIALLY

-0125"MODIFIEDTO-.0..'197" (5MM)STEAMNIPPLEINITIALLY "0'125"MODIFI'ED TO0.394"(10MM)~~4/g,.NRCForm346A(680)

NRCFORM385A(54ISIU.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDOMSNO.315040104 EXPIRES;4I30JS3ESTIMATED SURQENPERRESPONSETOCOMPLYWTHTHISINFORMATION COLL'ECTION REQUEST:50.0MRS.FQRWARQCOMMENTSREOAROINO bUROEHESTIMATETOTHERECORDSANDREPORTSMANAOEMEHT SRANCHIf@30).U.S.NUCLEARREOULATORY COMMISSION.

WASHINOTOH, DC30555,AHQTQ1HEfAPFRWORKREDUCTION PROJECT131504)104),

QffICEOFMANAGEMENT AHDSUDOET,WASHINGTON, DC30503,fACILITYNAMEIl)DOCKETNUMSER13)YEARLERNUMSERIblSEOVENTIAL NVMSEIIII5VISIONNVM~IIPACEISID.C.CookPlant-Unit2TEXTIllII>>IFZ>>ceJFIP0vbe4uwFIRRSN>>FJYRC%%dYm~3Il)T),osooo3l6900020010OF]0HAINSTEAMISOLATION VALVEVENTPIPINGVENTSTOATMOSPHERE DUMPVALVES3-WAYMOTOROPERATEDVALVEMSIVHRCF~SeSAISJISI

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