ML17329A583
| ML17329A583 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/12/1992 |
| From: | FITZPATRICK E INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17329A584 | List: |
| References | |
| AEP:NRC:1170D, NUDOCS 9208180194 | |
| Download: ML17329A583 (19) | |
Text
.ACCELERATEDDIQGBUTIONDEMONSTPTIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSTEN(BIDS)P!ACCESSXQNNBR:9206180194DGC.DATE:92/08/12NOTARIZED:YESDOCKET(I:FACXL:50-31,5DonaldC.CookNuclearPoeerPlant'nitiiIndiana80500031550-316DonaldC.CookNuclearPowerPlantiUnit2.XndianaN05000316AUTH.NANEAUTHORAFFILIATXGNFITZPATRICK'.IndianaNichiganPoeerCo.(formerlyIndiana5NichiganEleRECIP.NAXERECXrXENTAFFILIATIONNURLEYiT.E.DocumentControlBranch(DocumentControlDesk3
SUBJECT:
ApplicationforamendstoLicensesDPR-58ZcDPR-74>modifyingUnit1TS3.3.3.8.Table3.3-115Unit2TS3.3.3.6>Table3.3-10tochangeminchannelsrequiredtobeoperableforsafettIvalvepositionindicatoracousticmonitor.DISTRIBUTIONCODE:A001DCOPIESRECEIVED:LTRiENCLjSIZE:TITLE:ORSubmittal:GeneralDistributionDNOTES:RECIPIENTIDCODE/NAI"!EPD3-1LASTANGiJINTERMAL:NRR/DET/ESGBNRR/DST/SELB7ENRR/DST/SRXBBEGC/FXLE01COPIESLTTRENCL1122111110,RECIPIENTIDCODE/N*NEPD3-1PDNRR/DOEA/QTSB11NRR/DST/6ICBSH7NUDGCS-ABSTRACTOGC/HDS2RES/DSXR/EXBCOPIESLTTRENCL11111011DDEXTERNAL:NRCPDRDNOTETOALL"RIDS"RECIPIENTS:DPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMEPWSYOUDON'TNEED!TOTALNUMBEROFCOPXESREQUIRED:LTTRibENCL14 C~,l IndianaMichiganPowerCompanyP.O.Box16631Columbus,OH43216AEP:NRC:1170DDonaldC.CookNuclearPlantUnits1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74UNITS1AND2PRESSURIZERSAFETYVALVEPOSITIONINDICATORACOUSTICMONITORTECHNICALSPECIFICATIONAMENDMENTREQUESTU.S.NuclearRegulatoryCommissionDocumentControlDeskWashington,D.C.20555Attn:T.E.MurleyAugust12,1992
DearDr.Murley;ThisletteranditsattachmentsconstituteanapplicationforTechnicalSpecifications(T/Ss)changesforDonaldC.CookNuclearPlantUnits1and2.Specifically,
weareproposingtomodifyUnit1T/S3.3.3.8Table3.3-11andUnit2T/S3.3.3.6Table3.3-10tochangetheminimumchannelsoperableforthepressurizersafetyvalvepositionindicatoracousticmonitor(Instrument14)totwooutofthreetotalfromonepervalve.Wearealsoproposingtoremovethe*****footnotesandreferencestothe*****footnotesthatwereaddedduringthepreviousoperatingcycleforeachunitandarenolongerineffect.Attachment1providesadetaileddescriptionoftheproposedchanges,thejustificationforthechanges,andourproposeddeterminationofnosignificanthazardsconsiderationperformedpursuantto10CFR50.92(c).Attachment2containstheexistingT/Sspagesmarkedtoreflecttheproposedchanges.Attachment3containstheproposedT/Sspages.TheproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommitteeandbytheNuclearSafetyandDesignReviewCommittee.Incompliancewiththerequirementsof10CFR50.91(b)(1),copiesofthisletteranditsattachmentshavebeentransmittedtoMr.J.R.PadgettoftheMichiganPublicServiceCommissionandtotheMichiganDepartmentofPublicHealth.;9208i801949208i2'i>"I~DR,ADOCK050003i5P",PDR ll Dr.T.E.Hurley-2-AEP:NRC:1170DThisletterissubmittedpursuantto10CFR50.54(f)and,assuch,anoathofaffirmationisenclosed.Sincerely,E.E.FitzpatickVicePresidentdagEnclosureAttachmentscc:D.H.Williams,Jr.A.A.Blind-BridgmanJ.R.PadgettG.CharnoffNFEHSectionChiefA.B.Davis-RegionIIINRCResidentInspector-Bridgman COUNTYOFFRANKLINE.E.Fitzpatrick,beingdulysworn,deposesandsaysthatheistheVicePresidentoflicensee,IndianaMichiganPowerCompany,thathehasreadtheforgoingUnits1and2PressurizerSafetyValvePositionIndicatorAcousticMonitorTechnicalSpecificationAmendmentRequest,andknowsthecontentsthereof;andthatsaidcontentsaretruetothebestofhisknowledgeandbelief.Subscribedsndsworntobeforemethislasrdayof19~(NOTARYUBLIC
Attachment1toAEP:NRC:1170D10CFR50.92DeterminationforProposedChangestotheDonaldC.CookNuclearPlantUnits1and2TechnicalSpecifications Attachment1toAEP:NRC:1170DPage11.0SECTIONSTOBECHANGEDUnit1:Table3.3-11ofTechnicalSpecification(T/S)3.3.3.8.Unit2:Table3.3-10'ofTechnicalSpecification(T/S)3.3.3.6.2.0EXTENTOFCHANGESWeareproposingtochangetheminimumnumberofchannelsoperableforthepressurizersafetyvalvepositionindicatoracousticmonitors(Instrument14inUnit1T/STable3.3-11andUnit2T/STable3.3-10)fromonepervalvetotwooutofthreetotal.Wearealsoproposingtodeletethe*****footnotesandreferencestothe*****footnotesinthesametablesbecausethereferencedoperatingcyclehasbeencompletedandtheyarenolongerapplicable.3.0CHANGESREUESTEDIdenticalchangesarebeingsoughtforboththeUnit1andUnit2TechnicalSpecifications.3.1UNIT1WeareproposingtomakethefollowingchangestotheUnit1-"""TechnicalSpecifications.ReviseTable33-11"Post-AccidentMonitorinInstrumentation"Currently,Instrument14ofTable3.3-11hasanexceptiondenotedbya*****footnote.Weareproposingtodeletethisfootnote.Also,Instrument14ofTable3.3-11requiresthatasaminimum,onechannelpervalvebeoperable.Weareproposingtochangethistorequirethat,asaminimum,twooutofthreechannelstotalbeoperable.3.2UNIT2WeareproposingtomakethefollowingchangestotheUnit2TechnicalSpecifications.ReviseTable33-10"Post-AccidentMonitorinInstrumentation"Currently,Instrument14ofTable3.3-10hasanexceptiondenotedbya*****footnote.Weareproposingtodeletethisfootnote.
Attachment1toAEP:NRC:1170DPage2Also,Instrument14ofTable3.3-10requiresthat,asaminimum,onechannelpervalvebeoperable.Weareproposingtochangethistorequirethat,asaminimum,twooutofthreechannelstotalbeoperable.4.0DISCUSSIONSstemDescritionThereactorcoolantsystemisprotectedagainstoverpressurizationbycontrolandprotectivecircuits,suchasthepressurizerpressurehighreactortrip,andbythethreepower-operatedreliefandthreesafetyvalvesconnectedtothetopofthepressurizer.Uponopening,thesevalvesdischargesteamintothepressurizerrelieftank,whichcondensesandcollectsthevalveeffluent.Thissubmittaladdressesthemonitoringinstrumentationassociatedwiththepressurizersafetyvalvesandthepressurizerrelieftank.Thepurposeoftheacousticmonitorsistoprovidetheoperatorwithinformationregardingsafetyvalvepositionduringpost-accidentconditions.Twoindependentmonitoringsystemsexistthatalerttheoperatortothepassageofsteamthroughthesafetyvalvesduetovalvelift.Inoneoftheindependentmonitoringsystems,anacousticmonitor(QR-107A,B,andC)onthedischargeofeachsafetyvalvedetectsacousticvibrationsgeneratedfromthesteamflowingthroughthepressurizersafetyvalve,andactuatesanalarmandprovidesavisualdisplayofpercentageoffullflowinthecontrolroom.Duetothemagnitudeoftheacousticvibrationsandthesensitivityoftheinstrumentation,allthreemonitorswilldetecttheopeningofanyoneofthethreepressurizersafetyvalves.TheacousticmonitorswereaddedtomeettherequirementsofNUREG-0578,"TMI-2LessonsLearnedTaskForceStatusReportandShortTermRecommendations,"andNUREG-0737,"ClarificationofTMIActionPlanRequirements,"andareenvironmentallyqualified.Duringnormaloperationtheacousticmonitorsarenotusedtodetectpressurizersafetyvalveleakage.Intheotherindependentmonitoringsystem,atemperaturesensor(NTA-151,-152,-153)downstreamoftheacousticsensorgeneratesasignalthatactuatesacontrolroomalarmwhenatemperatureincreaseisexperiencedintheline,aswouldbethecaseifthepressurizersafetyvalvereleasedsteam.Theattachedsimplifieddiagramillustratesthisportionofthesystem.Indicationsofthetemperature,pressureandwaterlevelofthepressurizersafetyrelieftankarealsoprovidedinthecontrolroomandprovideadditionalindicationofpressurizersafetyvalveleakageduringnormaloperation.Thetemperatureofthewater Attachment1toAEP:NRC:1170DPage3inthepressurizerrelieftankismeasuredandindicatedbyinstrumentnumberNTA-351.Analarmresultingfromthissignalisactuatedbyhigh~atertemperature,andinformstheoperatorthatcoolingofthe"pressurizerrelieftankcontentsisrequired.Thepressurizerrelieftankpressuretransmitter(NPA-351)operatesahighandlowpressurealarm.Thepressurizerrelieftankleveltransmitter(NLA-351)providesasignalforalevelindicationandahighandlowtanklevelalarms.Consequently,adischargefromoneofthepressurizersafetyvalveswillcausetheseinstrumentstoprovideanalarmindicationinthecontrolroom.Alldownstreamtemperature,pressure,andtanklevelindicationsarenotenvironmentallyqualified.Inanemergencysituation,theoperatordoesnotuseasignalfromthepressurizersafetyvalvepositionindicatoracousticmonitorsas,anactioninitiator.Theoperatorrespondstootherindicationsoflossofreactorcoolantinventory.Astheoperatordoesnothavedirectcontrolofthepressurizersafetyvalve,"where"thelossofinventoryisoccurringisoflessimportancethancompensatingforthelossofinventory.Inaddition,theCookNuclearPlantemergencyoperatingproceduresdonotreferencethepressurizersafetyvalvepositionindicatoracousticmonitorsforthereasonstatedabove.ReasonforProosedTechnicalSecificationChaneReuestTherequesttoremovethefootnotesandreferencestothefootnotesismadeinordertoclarifytheTechnicalSpecificationsandtoremoveunnecessaryinformation.Withregardtochangingtheminimumnumberofoperablechannelsfromonepervalvetotwooutofthreetotal,inlettersAEP:NRC:1170datedDecember16,1991andAEP:NRC:1170BdatedJanuary22,1992,amendmentswererequestedtotheUnit2andUnit1TechnicalSpecifications,respectively,tointroducethe*****footnoteswhichareproposedtobedeletedbythisletter.Theserequestsweremadeonanexpeditedbasistoprecludeanunwarrantedshutdownofeachreactorunit.Webelievethereliefthatwasgrantedonatemporarybasiscanbesafelyimplementedonapermanentbasis.Sincemostofthepressurizersafetyvalvepositionindicatoracousticmonitorsystemisinaccessibleduringpoweroperation,thishastheadvantageofpotentiallyeliminatingtheneedforplantshutdownorforexpeditedoremergencyT/Sreliefshouldanacousticmonitorbecomeinoperableinthefuture.Webelievethathavinganacousticmonitorinoperabledoesnotwarrantreactorandplantshutdown.AstheT/Ssarecurrentlystated,shouldonepressurizersafetyvalvepositionindicator 4
Attachment1toAEP:NRC:1170DPage4acousticmonitorbecomeinoperable,itmustberestoredtooperablestatuswithinthirtydaysortheunitmustbeinhotshutdownwithinthesubsequenttwelvehours.Thermalcyclingfromunwarrantedplantshutdownsincreasesthelikelihoodofreactorvesselfatiguestresscyclesandunnecessarilychallengesthesafetysystems.Becauseasignalfromthepressurizersafetyvalvepositionindicatoracousticmonitorsisnotnecessarynorusedtoensurethesafeshutdownoftheunitevenifapressurizersafetyvalveisopenedorstuckopenduringanemergencysituation,webelievethataplantshutdownduetoaninoperableacousticmonitorwouldbeunwarranted.JustificationforProosedTechnicalSecificationChanesFortheremovalofthefootnotesandreferencestothefootnotes,theoperatingcyclesforwhichthefootnoteswerevalidhavebeenconcluded.Therefore,thefootnotesarenolongerapplicableandshouldberemoved.Forthereductionintheminimumnumberofchannelsoper'ablefromonepervalvetotwooutofthreetotal,first,thetemperaturesensorinstalleddownstreamofeachpressurizersafetyvalveprovidesindicationandalarmonboththecontrolroompanelandtheplantcomputer.Pastexperiencehasshownthesetemperaturesensorstobeeffectiveleakdetectiondevices.Inaddition,thepressurizersafetyvalvepositionindicatoracousticmonitoringsystemhasshowninthepastthatwhenoneofthepressurizersafetyvalvesopens,all-threesafetyvalvepositionindicatoracousticmonitorchannelsareactuated.Thisiscausedbythesensitivityoftheaccelerometersandthefactthatthethreesafetyvalvesandtheirassociatedacousticmonitorsensorsareincloseproximitytoeachotherandtiedtogetherthroughcommonpiping.Thus,ifthepressurizersafetyvalveassociatedwiththeinoperablepositionindicatoracousticmonitorchanneldischarges,theremainingtwopositionindicatoracousticmonitorchannelswouldalerttheoperator,Anadditionalbenefittothiseffectisthatitalsoenablestheoperatortodiscriminateavalidalarmindicationfromaninvalidalarmindication.Otherinstrumentationexiststhatprovidestheoperatorwithindicationofpressurizersafetyvalveactuation.Thepressurizersafetyvalvesdischargeintothepressurizerrelieftank.Thetemperature,pressure,andliquidlevelofthetankareindicatedandalarmedinthecontrolroom.Achangeintheseparameterswouldalarmandalerttheoperatorofasafetyvalvedischarge.condition.
Attachment1toAEP:NRC:1170DPage5Finally,inanemergencysituation,theoperatordoesnotuseasignalfromthepressurizersafetyvalvepositionindicatoracousticmonitorsasanactioninitiator.Theoperatorrespondstootherindicationsoflossofreactorcoolantinventory.As'theoperatordoesnothavedirectcontrolofthepressurizersafetyvalve,"where"thelossofinventoryisoccurringisoflessimportancethancompensatingforthelossofinventory.Inaddition,theCookNuclearPlantemergencyoperatingproceduresdonotreferencethepressurizersafetyvalvepositionindicatoracousticmonitors.5.0NOSIGNIFICANTHAZARDSDETERMINATIONWehaveevaluatedtheproposedT/Ssexemptionandhavedeterminedthatitshouldnotrequireasignificanthazardsconsiderationbasedonthecriteriaestablishedin10CFR50.92(c).OperationoftheCookNuclearPlantinaccordancewiththeproposedamendmentwillnot:(1)Involveasinificantincreaseintherobabilitorconseuencesofanaccidentreviouslevaluated.Althoughtheproposedexemptionresultsintheoperatorhavingonelesssourceofinformationonplantstatus,itdoesnotcreateasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.Theacousticmonitorsdonotperformafunctionvitaltosafeshutdownortotheisolationofthereactor,orthereactorcoolantsystempressureboundary,noristhereamechanisminvolvinganoperableorinoperablepressurizersafetyvalveacousticmonitorwhichwouldinitiateanaccident.ThesemonitorswereaddedtomeettherequirementsofNUREG-0578andNUREG-0737.Duringnormaloperations,otherinstrumentationexiststhatprovidestheoperatorwithindicationofsafetyvalveactuation.Theacousticmonitorsarenotnecessarytoandarenotusedintheemergencyoperatingprocedures.Inaddition,theacousticmonitorsbeinginoperablewillnotresultinanuncontrolledreleaseofradiationtotheenvironmentandwillnotinitiateanaccident.Finally,althoughtheoperatormayhaveonelesschanneloperable,theoperatorreceivesnolessinformationthanifallthreechannelsareoperablebecause"onevalveopeningcausesalloperablechannelstoactuateTherefore,weconcludethattheproposedT/Sschangesdonotinvolveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.(2)Createtheossibilitofanewordifferentkindofaccidentfromanreviouslanalzed.Aspreviouslystated,thepurposeoftheacousticmonitoris'toprovidetheoperatorwithinformationregardingsafetyvalveposition EtCII' Attachment1toAEP:NRC:1170DPage6thatmayassistinthemitigationoftheconsequencesofanaccident.Specifically,itprovidesinformationthatasafetyvalvehaslifted.However,theoperatorhasothermechanismsforobtainingequivalentinformation.Inaddition,thesignalsgeneratedbyanacousticmonitordonotinitiateanyotherequipmentactuation,norwilltheinoperabilityofanacousticmonitorinitiateanyaccident.Consequently,theproposedT/Sschangesdonotcreatethepossibilityofanewordifferentkindofaccidentfromanypreviouslyanalyzed.(3)InvolveasinificantreductioninamarinofsafetTheproposedT/Sschangesresultintheoperatorpotentiallyhavingonelesssourceofinformationonplantstatus.However,webelievethemarginofsafetyisnotreducedforseveralreasons.First,theoperatorisprovidedwithotherviableflowdetectiondevicestodeterminepressurizersafetyvalveposition,i.e.,thetemperaturesensoronthedischargelineassociatedwiththeinoperableacousticmonitor,andpressurizerrelieftanklevel(NLA-351),temperature(NTA-351)andpressure(NPA-351)indications.Also,theacousticmonitorsarenotusedbytheoperatorsinanemergencysituation,as.theoperatorreliesonotherindicationsoflossofreactorcoolantinventorypertheemergencyoperatingprocedures.Inaddition,previousexperiencewithth'epressurizersafetyvalvepositionindicatoracousticmonitoringsystemhasshownthat,whenanyoneofthepressurizersafetyvalvesopens,allthreesafetyvalvepositionindicatoracousticmonitorsareactuated.Becauseofthis,theoperatorreceivesnolessinformationregardlessifonlytwoorthreechannelsareoperable.Basedontheabove,webelievethathavinganacousticmonitorinoperabledoesnotwarrantreactorandplantshutdown.AstheT/Ssarecurrentlystated,shouldonepressurizersafetyvalvepositionindicatoracousticmonitorbecomeinoperable,itmustberestoredtooperablestatuswithinthirtydaysortheunitmustbeinhotshutdownwithinthesubsequenttwelvehours.Thermalcyclingfromunwarrantedplantshutdownsincreasesthelikelihoodofreactorvesselembrittlementandunnecessarilychallengesthesafetysystems.Becauseasignalfromthepressurizersafetyvalvepositionindicatoracousticmonitorsisnotnecessarynorusedtoensurethesafeshutdownoftheunitevenifapressurizersafetyvalveisopenedorstuckopenduringanemergencysituation,webelievethataplantshutdownduetoaninoperableacousticmonitorwouldbeunwarranted.WebelievethattheunitcanbeoperatedsafelyandthatwewouldstillmeettheintentofNUREG-0538andNUREG-0737withonlytwooutofthreepressurizersafetyvalvepositionindicatoracousticmonitorsoperable.
Attachment1toAEP:NRC:1170DPage76.0PENDINGTSsPROPOSALSIMPACTINGTHISSUBMITTALThereiscurrentlyoneotherT/Ssproposalunderreviewthatimpactsthissubmittal.InoursubmittalAEP:NRC:1137,datedFebruary15,1991,changesareproposedtoUnit1T/Spage3/43-55andUnit2T/Spage3/43-46.Thechangesproposedinthissubmittal(AEP:NRC:1170D)aretobemadeinadditiontothoseinAEP:NRC:1137.
ROH-ORVS41SV-55ASV-45BSV-4SCPRESSUR12ER/UPTURNDLSCSPRESSURlZggRELIEFTANK