ML17331B068
| ML17331B068 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 11/15/1993 |
| From: | FITZPATRICK E INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17331B069 | List: |
| References | |
| AEP:NRC:1193, NUDOCS 9311190293 | |
| Download: ML17331B068 (20) | |
Text
ACCEIERAEDDOCUMENTDIST'TIONSYSTEMREGULORYINFORMATIONDISTRIBUT~.SYSTEM(RIDS)ACCESSIONNBR:9311190293DOC.DATE:93/11/15NOTARIZED:YESDOCKET¹FACIL:50-315DonaldC.CookNuclearPower-Plant,Unit1,IndianaM0500031550-316DonaldC.CookNuclearPowerPlant,Unit2,IndianaM05000316'UTH.NAMEAUTHORAFFILIATIONFITZPATRICK,R.IndianaMichiganPowerCo.(formerlyIndiana6MichiganEleRECIP.NAMERECIPIENTAFFILIATIONMURLEY,T.E.DocumentControlBranch(DocumentControlDesk)I
SUBJECT:
ApplicationforamendstolicensesDPR-586DPR-74,modifyingTS4.6.5.l.b.l,263tochangeicecondenserbedSRintervalfrom9monthsto18months.DISTRIBUTIONCODE:ROOIDCOPIESRECEIVED:LTRgENCLfSIZE:/37STITLE:ORSubmittal:GeneralDistribution.NOTES:RECIPIENTIDCODE/NAMEPD3-1LAWETZEL,BINTERNAL:NRR/DE/EELBNRR/DRCH/HICBNRR/DSSA/SRXBOCLEGF~01EXTERNAL:NRCPDRCOPIESLTTRENCL1122111111101111RECIPIENTIDCODE/NAMEPD3-1PDNRR/DORS/OTSBNRR/DSSA/SPLBNUDOCS-ABSTRACTOGC/HDS2NSICCOPIESLTTRENCL111111111011DDDDNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTEICONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!DTOTALNUMBEROFCOPIESREQUIRED:LTTR15ENCL13 IndianaMichig~~PowerCompa+P.O.Box1663<Columbus,OH43216gAEP:NRC:1193DonaldC.CookNuclearPlantUnits1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74UNITS1AND2ICECONDENSERICEBEDSURVEILLANCEREQUIREMENTTECHNICALSPECIFICATIONAMENDMENTREQUESTU.S.NuclearRegulatoryCommissionDocumentControlDeskMashington,D.C.20555Attn:T.E.MurleyNovember15,1993
DearDr.Murley:
ThisletteranditsattachmentsconstituteanapplicationforTechnicalSpecifications(T/Ss)changesforDonaldC.CookNuclearPlantUnits1and2.Specifically,weareproposingtomodifyUnit1T/S4.6.5.1.b.l,2,and3andUnit2T/S4.6.5.1.b.l,2,and3tochangethesurveillancerequirementintervalfrom9monthsto18months.Attachment1providesa.detaileddescriptionoftheproposedchanges,thejustificationforthechanges,andourproposeddeterminationofnosignificanthazardsconsiderationperformedpursuantto10CFR50.92(c).Attachment2containstheexistingT/Sspagesmarkedtoreflecttheproposedchanges.Attachment3containstheproposedT/Sspages.TheproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommitteeandbytheNuclearSafetyandDesignReviewCommittee.Incompliancewiththerequirementsof10CFR50.91(b)(l),copiesofthisletteranditsattachmentshavebeentransmittedtoMr.J.R.PadgettoftheMichiganPublicServiceCommissionandtotheMichiganDepartmentofPublicHealth.3.80<"'89311190293931115PDRADOCK05000315PPDRo4.
Dr.T.E.Murley-2-AEP:NRC:1193Thisletterissubmittedpursuantto10CFR50.54(f)and,assuch,anoathstatementisattached.Sincerely,VicePresidentAttachmentscc:A.A.Blind-BridgmanG.CharnoffJ.B.Martin-RegionIIINFEMSectionChiefNRCResidentInspector-BridgmanJ.R.Padgett
Dr.T.E.MurleyAEP:NRC:1193bc:S.J.Brewer/J.B.Kingseed/S.A.HoverD.H.Malin/K.J.TothM.L.Horvath-BridgmanJ.B.ShinnockW.G.Smith,Jr.B.A.Wetzel,NRC-Washington,D.C.AEP:NRC:1193DC-N-6015,1 COUNTYOFFRANKLINE.E.Fitzpatrick,beingdulysworn,deposesandsaysthatheistheVicePresidentoflicensee,IndianaMichiganPowerCompany,thathehasreadtheforgoingUnits1and2IceCondenserIceBedSurveillanceRequirementTechnicalSpecificationAmendmentRequest,andknowsthecontentsthereof;andthatsaidcontentsaretruetothebestofhisknowledgeandbelief.Subscribedandsworntobeforemethisdayof19WDNOTARYPUBLICDlANAL.EADSNotaryPublic,StateofOhioJ)ycommissionexpires22495 Attachment1toAEP:NRC:1193lOCFR50.92DeterminationforProposedChangestotheDonaldC.CookNuclearPlantUnits1and2TechnicalSpecifications Attachment1toAEP:NRC:1193Page11.0SECTIONSTOBECHANGEDUnit1:TechnicalSpecification(T/S)4.6.5.l.b.l,2,and3.Unit2:TechnicalSpecification(T/S)4.6.5.1.b.l,2,and3.2.0EXTENTOFCHANGESWeareproposingtochangethesurveillancerequirementintervalfrom9monthsto18monthsonthereferencedTechnicalSpecificationsforchemicalanalysis,weighing,andflowpassageinspectionoftheicecondenser.3.0CHANGESREUESTEDIdenticalchangesarebeingsoughtforboththeUnit1andUnit2TechnicalSpecifications.3.1UNIT1WeareproposingtomakethefollowingchangestotheUnit1TechnicalSpecifications.ReviseTS4651bSurveillanceIntervalReuirementsCurrently,thereisaninemonthsurveillancerequirementtoperformchemicalanalysesoftheicebedtoensureaboronconcentrationof1800ppmandapHof.9.0to9.5at'5'C,verifyata95Xconfidencelevelthatadequateiceinventoryisavailableanddistributedevenly,andensurethatadequateflowareaisavailable.Weareproposingtochangethisintervalto18months.3.2UNIT2WeareproposingtomakethefollowingchangestotheUnit2TechnicalSpecifications.ReviseTS465.1bSurveillanceIntervalReuirementsCurrently,thereisaninemonthsurveillancerequirementtoperformchemicalanalysesoftheicebedtoensureaboronconcentrationof1800ppmandapHof9.0to9.5at25'C,verifyata95Xconfidencelevelthatadequateiceinventoryisavailableanddistributedevenly,andensurethatadequateflowareaisavailable.Weareproposingtochangethisintervalto18months.
'II Attachment1toAEP:NRC:1193Page2ItshouldbenotedthatthebasesforT/S3/4.6.5.1willneedtobeupdatedtoreflecttheincreasedtimeintervaliftheproposedamendmentisapproved.4,0DISCUSSIONSstemDescritionTheicecondenserisdesignedtoensurethattheoverallsystemwillbeavailabletoprovidesufficientpressuresuppressioncapabilitytolimitthecontainmentpeakpressuretolessthan12psigduringLOCAconditionsassumedintheaccidentanalysis.Inparticular,therequirementsfortheicebedensurethattherequirediceinventorywill1)bedistributedevenlythroughthecontainment.bays,2)containsufficientborontoprecludedilutionofthecontainmentsumpfollowingaLOCA,and3)containsufficientheatremovalcapabilitytocondensethereactorcoolantsystemvolumeduringaLOCA.Currently,theicebedisdeterminedoperablebymeetingvarioussurveillancerequirementswhichinclude1)verifyingicebedtemperatureislessthanorequalto27'Fatleastoncepertwelvehours,2)performingchemicalanalysesoftheicebedtoensureaboronconcentrationof1800ppmandapHof9.0to9.5at25'Catleasteveryninemonths,3)verifyingata95Xconfidencelevelthateachbasketcontainsatleast1220lbsoficeeveryninemonths,4)ensuringadequateflowareaisavailableatleastonceeveryninemonths,5)performingavisualinspectionatleastonceper18monthsoftheinletplenumsupportstructuresandturningvanestoensureicebuildupisnottothepointofindicatingabnormaldegradationoftheicecondenser,and6)verifyingthestructuralintegrityoftheicebasketsbyinspectingarepresentativesampleatleastonceevery40months.Allofthesesurveillancerequirementsaremetbyperformanceofapprovedplantprocedures.Thefirstlineofdefensetodeterminetheoperabilityoftheicecondenserlieswiththeoperator.Asmentionedabove,theicebedtemperatureismonitoredatleastonceeverytwelvehourstoensuretemperaturesarelessthanorequal-to27'F.Thisisaccomplishedinaconservativemannerbyreviewingatleast18differentpointsthroughouttheicecondenserandensuringtheyarealllessthanorequalto27'F.Throughouttheyeartheaverageicebedtemperaturegenerallyrangesbetween16'Fand21'F,wellbelowthe27'Fsetpoint.Inadditiontothesurveillancerequirements,therearealarmsinthecontrolroomwhichwillindicatetotheoperatorifanyofthepointsbeingrecordedreach27'F.Also,weeklyoperatortoursrequiretheoperatorstowalkdowntherefrigerationsystemtoevaluateitsabilitytofunction.Thisincludeswalkingdownthe
~g'Il'~off Attachment1toAEP:NRC:1193Page3chillers,airhandlingunits,andglycolpumpstoensurethattheyareinproperworkingorder.Thetoursalsorequiretheoperatorstoopenasampleoftheintermediatedeckdoorstoensuretheyarenotfrozenshut.Thishelpstoensurethatnoabnormaldegradationoftheicecondenserisoccurringduetocondensationorfrozendrainlinesinlocalizedareas.Thenextlineofdefenseistheperformanceofvariousprocedurestoensuretheicebedisingoodphysicalcondition,consistentwiththeassumptionsusedintheaccidentanalysis.Duetotheninemonthsurveillancerequirement,thesesurveillancesarecurrentlycompletedatleastonceduringafuelcyclewhilethereactorisonlineandonceduringtherefuelingoutage.Thesesurveillancesarereferencedaboveandincludechemicalsampling,icebasketweighing,andflowpassageinspection.ThereasonforthechemicalsamplingistoensuretheboronconcentrationandpHrequirementsaremettoprecludedilutionofthecontainmentsumpfollowingaLOCA.Theminimumweightfigureof1220poundsoficeperbasketcontainsa10Xconservativeallowanceforicelossthroughsublimation.Flowpassageinspectionisperformedtoensuretheabsenceofabnormalicebeddegradationaswouldbeindicatedifaccumulationsexceedthe3/8"specifiedinthetechnicalspecifications.Whenthesesurveillancesareperformedwhileinarefuelingoutage,as-founddataiscollectedpriortoperformingthelaborintensivemaintenanceroutine.Themaintenanceroutinetypicallyincludesweighingasmanybasketsaspossiblewithinanallottedtimeframeandemptyingthebasketsthatwouldnot,basedonoperatingexperience,weighgreaterthan1220poundsat'hestartofthenextrefuelingoutage.Thesubsequentmaintenanceincludesrefillingtheicebasketswithiceandperformingdefrostsoftheicecondenserasnecessarytoensuremaximumheattransfercapabilityduringtheupcomingfuelcycle.Also,significanteffortisdedicatedtocleaningupicethataccumulatesduringtheemptying/refillingprocessoftheicebasketstoensurenoflowblockageoccursduringthesubsequentfuelcycle.Tworemainingsurveillancesareperformedtoensurethatnoabnormaldegradationoftheicecondenseristakingplace.Thefirst,performedonan18monthfrequency;.is-aninspectionoftheinletplenumandturningvanesforfrostoriceaccumulation.Thesecond,performedona40monthfrequencyisavisualstructuralinspectionoftheicebasketstoensurethattheyarefreeofdetrimentalstructuralwear,cracks,corrosionorotherdamage.
~y1L.a Attachment1toAEP:NRC:1193Page4ReasonforProosedTechnicalSecificationChaneReuestTherequesttoincreasethesurveillanceintervalfromninemonthsto18monthswoulddecreasethenumberofevolutionsnecessarytoentercontainmentduringoperationoftheunittoverifyicebasketboronconcentrations,weights,andflowareablockage.Therevisedsurveillanceintervalwouldrequiretheperformanceofsuchicebedmonitoringduringrefuelingoutages.Webelievethatimprovementsinicebedinspectionresultsduetomodifiedmaintenancetechniquesanddesignchangesthathavebeenimplementedsince1984provideadequateassurancethattheicecondensercanmeetandevenexceeditsdesignfunctionwithoutperformingthesurveillancesonaninemonthfrequency.Also,increasingthesurveillanceintervalwouldreducethestressesputonthebasketsandtheirsupportsduetorepeatedweighingevolutions'ustificationforProosedTechnicalSecificationChanesAnincreasedsurveillanceintervalforthechemicalanalysisrequiredbyT/S4.6.5.1.b.lisjustifiedforthefollowingreasons,First,priortorefillingbasketsduringrefuelingoutagemaintenanceactivities,theboratedwatersourceusedtomakeiceissampledtoverifythattheboronconcentrationandpHlevelsaremet.Areviewoflicenseeeventreportsdatingbackthrough1978revealednooccurrencesoffailingtomeetthesurveillancerequirementsofthisspecification.Also,areviewoficecondenserbasketboronconcentrationandpHsampledatabetweenAugust,1986andSeptember,1992forUnit1andbetweenAugust,1986andJanuary,1993forUnit2wasreviewed,andotherthanafewproblemsduetothesamplingtechniques,noproblemswereapparentinmeetingthesurveillancerequirementsofthisspecification.Also,itshouldbenotedthatanincreasetothe18monthfrequencyhasalreadybeenapprovedinthenewstandardtechnicalspecificationsforWestinghouseplantsissuedinSeptember1992bytheNRC.Thefrequencyof18monthswasdevelopedconsideringthesefacts:-1)Longtermicestoragetestshavedeterminedthatthechemicalcompositionofthestorediceisextremelystable,2)OperatingexperiencehasdemonstratedthatmeetingtheboronconcentrationandpHrequirementshasneverbeenaproblem,and3)Someonewouldhavetoenterthecontainmenttotakethesample,and,iftheunitisatpower,thatpersonwouldreceivearadiationdose.
Attachment1toAEP:NRC:1193Page5TS4.6.51b2Areviewoflicenseeeventreportsregardingicebasketweighingdatingbackthrough1978forT/S4.6.5.1.b.2wasperformed.Duringthistimeframe,therewerethreeoccurrencesinUnit1andfiveoccurrencesinUnit2whensomeofthesurveillancerequirementswerenotmet.T/S4.6.5.l.b.2requiresthefollowingthreecriteriabemettomeeticeinventoryrequirements.1)Arepresentativesampleofatleast144icebasketsmustbeweighedanddeterminedtocontainatleast1220poundsoficeata95percentlevelofconfidence,2)Theminimumaverageiceweightsofthesamplebasketsfromradialrows1,2,4,6,8and9ineachofthreegroupsshallnotbelessthan1220poundsoficeata95percentlevelofconfidence,and3)Minimumtotalicecondenserweightata95percentlevelofconfidenceshallnotbelessthan2,371,450pounds.Theoccurrencesoccurredin1982,1983,and1985inUnit1andin1982,1983,1984,and1986inUnit2.Asaresultoftheproblemsencountered,anicecondensertaskforcewasformedcomposedofplantengineers,AEPSCengineers,andconsultingspecialistsinrefrigeration.Thistaskforceprovidednumerousrecommendationstoimprovethecoolingcapabilityoftheicecondenserrefrigerationsystemanddevelopedbettermaintenancetechniquestoimproveiceweights.Someoftherecommendationswhichhavebeenincorporatedasdesignchangesincludeinstallingaprogrammabledefrostcontrollerforairhandlingunitstoensurethatheatloadsaredistributedevenlythroughouttheicecondensertoreduceexcessivesublimationinlocalizedareas.Duringrefuelingoutageicereplenishmentactivities,toolsandvariousothermaterialshadaccumulatedintheductwork,whichcreatedhotspotsintheicebedandincreasedsublimationrateswheretheductworkwasblocked.Debrisscreenswereinstalledoverwallpanelopeningstoprecludecloggingofductworkusedtocooltheicebed.Also,aflowbalanceoftheductworkwasperformedinbothunitstodistributecoolingmoreevenlytothecranewallinordertoreducesublimationratesthatwereoccurringinrows8and9.Manyotherdesignchangeshavebeeninstalledtoimprovethereliabilityandperformanceoftheicecondenserrefrigeration.system.Maintenancetechniquesdevelopedincludedusingvibratorstoemptybasketsanddevelopingtoolstoreplacecruciformsinthebaskets.Thistaskforceisstillintactandconvenesperiodicallytoreviewthestatusoficecondenserissues.Asrecommendedbythetaskforce,maintenancetechniqueswerealsoenhancedtoincreasetheiceweightsinbasketstoensureminimumtechnicalspecificationrequirementswouldbemetwithouthavingtoshutdownthereactormid-cycletoreplenishiceinventory.Thiswas
,)
Attachment1toAEP:NRC:1193Page6accomplishedbydevelopingtechniquestoemptythebasketcompletelyandthenrefillingitwithnewiceinsteadofaddingwatertoexistingiceorpackingicebyhandtoincreaseiceweight.Thesetechniques,aswellastheabovedesignchangeimplementations,haveledtoanincreaseintheaverageas-foundicebasketweightsofatleast90poundsinUnit1sinceSeptemberof1985andinUnit2sinceDecemberof1984.Itshouldbenotedthatthethirdrequirementfortotalminimumicecondenserweighthasalwaysbeensatisfiedandhasneverbeenanissueofconcern.Thedeficiencieshaveoccurredwhencalculatingaverageindividualandgroupbasketweights.Recommendationsalsoresultedinaheightenedawarenessoftheimportanceoftherefrigerationsystemanditsassociatedmaintenancepracticeswhichhavebeenimprovedtoensurethatairhandlingunitsarerepairedinatimelymanner.Weeklytoursbyoperationspersonnelhavealsobeenincorporatedtoidentifyrefrigerationsystemdeficienciesbeforetheyhaveanadverseeffectontheconditionoftheicecondenser.TheactionsrequiredbyT/S4.6.5.l.a,whichisperformedona12hourinterval,aswellasassociatedalarmsofferadequateindicationforicebedandrefrigerationsystemstatuspriortoanyabnormaldegradationoftheicecondenser.Basedonthepreviousdiscussion,weproposethatthesurveillanceintervalofninemonthsforT/S4.6.5.1.b.2beincreasedto18months.Asimilarrequest,publishedintheFederalRegisteronFebruary20,1991wasmadebyDukePowerCompanyfortheirCatawbaNuclearStation,Units1and2,andwassubsequentlyapprovedbytheNRC.DukePowerCompanyincreasedtheirminimumrequirediceweightsapproximatelyfivepercenttoaccountforexpectedsublimation.WebelievethisisnotnecessaryfortheCookNuclearPlantrequestbecausethepreviousweighingsduringtheUnit1andUnit2refuelingoutagesdatingbackthrough1986havemetallsurveillancerequirementswithoutanyiceadditionsbeingmademid-cycle.TS4.6.5.1.b.3WithrespecttotheflowpassageinspectionsrequiredbyTechnicalSpecification4.6.5.1.b.3,licenseeeventreporthistorieswerereviewedbackthrough1978.Inthattimeframe,thereweresevenoccurrencesbetween1983and1988whichindicatedthattherequirementsofthespecificationhadnotbeenmet.Ineachofthecases,however,itwasconcludedthattheflowpassageswerenotdegradedtosuchadegreethatwouldhaveprohibitedtheice
'
Attachment1toAEP:NRC:1193Page7condenserfromperformingitsdesignfunctionasassumedintheshort-termcontainmentintegrityanalysis.Since1988therehasbeennoindicationofabnormalicebeddegradationwithrespecttomeetingtherecpxirementsofT/S4.6.5.1.b.3.WebelievethatthesurveillancesperformedperT/S4.6.5.1.aona,twelvehourintervalandtheaddedtoursperformedontheicecondenserrefrigerationsystembyoperationspersonnelprovidesufficientindicationofabnormaldegradationoftheicecondenserpriortoitbecomingaconcern.ItshouldbenotedthatthefailuresthatoccurredperT/S4.6.5.1.b.2alsooccurredduringasimilartimeframe(1982through1986),andwebelievethedesignchangesimplementedandtheenhancedmaintenancetechniquesdiscussedabovehavecontributedtoreducingtheamountoficebuild-upintheflowpassages.Alsotobeconsideredaretheextensiveeffortsthatareputforthtoensureflowpassagesarecleanedoutfollowingmaintenanceactivitiesduringarefuelingoutage.New,methodsweredevelopedin1992toperformlocalizeddefrostingoftheicecondenserbayswhichhavereducedfrostbuildupontheicecondenserlatticeframeworkalongthecraneandcontainmentwalls.Basedonthefactthatthesurveillancerequirementsfortheprocedureshavebeenmetsince1988,throughthreemid-cycleinspections,inbothUnit1andUnit2,werequestthattheintervalforinspectionbeincreasedto18months.5'NOSIGNIFICANTHAZARDSDETERMINATIONWehaveevaluatedtheproposedT/Ssexemptionandhavedeterminedthatitshouldnotrecpxireasignificanthazardsconsiderationbasedonthecriteriaestablishedin10CFR50.92(c).OperationoftheCookNuclearPlantinaccordancewiththeproposedamendmentwillnot:(1)Involveasinificantincreaseintherobabilitorconseencesofanaccidentreviouslevaluated.Theincreaseinthesurveillanceintervaldoesnotcreateasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.Recentoperatingexperiencewiththeicecondenserindicatesthatallrequiredboronconcentrations,pHlevels,iceweights,andfrostoriceaccumulationcriteriaestablishedintheT/Sshavebeenmetwithoutanycorrectiveorpreventiveactionbeingtakenduringthemid-cycleinspections.Thisprovidesconfidencethattheicecondenserwillcontinuetobeabletoperformasassumedinthesafetyanalysis.Therefore,weconcludethattheproposedT/Sschangesdonotinvolveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.
Attachment1toAEP:NRC:1193Page8(2)CreatetheossibilitofanewordifferentkindofaccidentfromanreviouslanalzedTheincreaseinthesurveillanceintervalfortheicecondenserfrom9to18monthswillnotaffectthefunctionalityorrequiredperformancecapabilityoftheicecondenser.Theabovereviewfoundnopossibilityofanewordifferentkindofaccidentfromanypreviouslyanalyzed.(3)InvolveasinificantreductioninamarinofsafetTheproposedT/Sschangesonlychangethesurveillancefrequencyrequirementswhichwebelievewillnotchallengetheabilityoftheicecondensertoperformitsfunctionasdefinedinthesafetyanalysis.OtherT/Ssandplantindicationsareinplacetowarntheoperatorofrefrigerationsystemproblemspriortopossibleicebeddegradation.Therefore,weconcludethattheT/Schangedoesnotinvolveasignificantreductioninamarginofsafety.6.0PENDINGTSsPROPOSALSIMPACTINGTHISSUBMITTALTherearecurrentlynootherT/Ssproposalsunderreviewthatwouldimpactthissubmittal,