ML17325B603

Provides Response to NRC GL 98-04, Potential for Degradation of ECCS & Containment Spray Sys After LOCA Because of Const & Protective Coating Deficiencies & Foreign Matl in Containment.

ML17325B603
Person / Time
Site:	Cook
Issue date:	05/21/1999
From:	RENCHECK M W INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AEP:NRC:C0599-0, AEP:NRC:C599, GL-98-04, GL-98-4, NUDOCS 9905280222
Download: ML17325B603 (15)

Text

CATEGORY'REGULA'iYINFORMATIONDISTRIBUTI.SYSTEM(RIDS)ACCESSIONNBR:9905280222DOC.DATE:99/05/21NOTARIZED:YESDOCKETFACIL:50315DonaldC.CookNuclearPowerPlant,Unit1,IndianaM0500031550-316DonaldC.CookNuclearPowerPlant,Unit2,IndianaM05000316AUTH.NMT8AUTHORAFFILIATIONRENCHECK,M.W.IndianaMichiganPowerCo.-(formerlyIndiana&MichiganEleRECIP.NAMERECIPIENTAFFILIATIONRecordsManagementBranch(DocumentControlDesk)

SUBJECT:

ProvidesresponsetoNRCGL98-04,"PotentialforDegradationofECCS&ContainmentSpraySysAfterLOCABecauseofConst&ProtectiveCoatingDeficiencies&ForeignMatlinContainment."TDISTRIBUT1'ONCODE:AOSODCOPIESRECEIVED:LTRIENCLISIZE:ITITLE:GenericLetter98-04-PotentialfortheDegradationoftheEmergencyENOTES:RECIPIENTIDCODE/NAMESTANG,JCOPIESLTTRENCL11RECIPIENTIDCODE/NAMECOPIESLTTRENCLINTERNAL:FILECENTER01~11~NRR/DLPM/LPD311NRR/DE/EMCBNRR/DSSA/SPLB1111EXTERNAL:NRCPDR11D'E)Pttgi,tDii(Ql(-lgPwf"ui,~UMl.lJ~Ulimniti~i,'i)NOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083ITOTALNUMBEROFCOPIESREQUIRED:LTTR6ENCL"6 IndianaMichigan~.PowerCompany~500CircleDriveBuchanan,Ml491071395ÃINDIANANICHIGAlltIPOWMMay21,1999AEP:NRC:C0599"01DocketNos.:50-31550-316U.S.NuclearRegulatoryCommissionATTN:DocumentControlDeskHailStop0-P1-17Washington,D.C.20555-0001DonaldC.CookNuclearPlantUnits1and2GENERICLETTER98-04:POTENTIALFORDEGRADATIONOFTHEEMERGENCYCORECOOLINGSYSTEMANDTHECONTAINMENTSPRAYSYSTEMAFTERALOSS-OF-COOLANTACCIDENTBECAUSEOFCONSTRUCTIONANDPROTECTIVECOATINGDEFICIENCIESANDFOREIGNMATERIALINCONTAINMENT

Reference:

LetterAEP:NRC:1260GH,"DonaldC.CookNuclearPowerPlant,Units1and2,ENFORCEMENTACTIONS98-150,98-151,98-152AND98-186,REPLYTONOTICEOFVIOLATIONDATEDOCTOBER13,1998,"datedMarch19,1999.Gentlemen:Inaccordancewith10CFR50.54(f),IndianaMichiganPowerCompany(I&H)herebyprovidestheresponsetoNRCGenericLetter98-04.Thisgenericletterrequireslicenseestoprovideinformationregardingtheirprogramsforthecontrolofprotectivecoatingsinsideofthecontainmentstructure.Therequestedinformationincludesprocurementofcoatings,qualificationtestingofcoatings,surfacepreparationandapplicationof'oatings,andsurveillanceandmaintenanceactivitiesassociatedwithcoatings.Additionally,thegenericletterrequestsinformationaboutunqualifiedcoatingsthatmaybelocatedinside'he:containmentstructure.Theattachmenttothisletterprovidestherequiredresponsetoitems(1)and(2)ofthegenericletter.Thislettercontainsonecommitment,whichistoenhanceplantproceduresthatcontrolcoatingsinsidecontainment.CurrentplansaretohavetheseplantproceduresdevelopedbyOctober30,1999.',,','0Inadditiontorespondingtothisgenericletter,I&Hiscurrentlyreviewingrecirculationsumpoperabilityissues,includingsumpblockagecausedbyaccidentgenerateddebris.Asnotedinthereferencedletter,debrisgenerationandtransport9905280222O'F0521PDRADQCK05000315PPDR AEP:NRC:C0599-01U.S.NuclearRegulatoryCommissionPage2evaluationshavebeenperformed,unwantedmaterialhasbeenremovedfromthecontainment,andproceduresandspecificationshavebeenwrittenorrevisedtobettercontrolfibrousmaterialsinsideofcontainment.I&MplanstocontinuetheseeffortsaspartoftheCookNuclearPlantrestarteffort.Therequireddateforsubmittaloftherequestedinformationwas.November12,1998.TheCookNuclearPlantiscu'rrentlyshutdownandinanextendedoutage.I&M'sdelayinprovidingthisresponseisduetothededicationofengineeringandtechnicalsupportresourcestotheCookNuclearPlant'srestarteffort.TheNRCProjectManagerfortheCookNuclearPlantwasinformedofthisdelay.Sincerely,J@r/M.W.RencheckVicePresidentNuclearEngineeringSWORNTOANDSUBSCRIBEDBEFOREMETHIScd/DAYOFQQ.1999JNICENLSiCKERSt8htyPub."c,BerrisnCornty,MMyCommissionExpirosFeb.16,2001NOTARYPUBLICMyCommissionExpires:/4~dYAttachment/rgvA.C.BakkenJ.E.Dyer,w/attachmentMDEQ-DW&RPDNRCResidentInspector,w/attachmentR.Whale

/,i>>rI' U.S.NuclearRegulatoryCommissionPage3Ibc:T.P.BeilmanwattachmenAEP:NRC:C0599-01/tJ.J.EutoFOLXO,w/attachmentB.J.HickleG.HonmaD.F.Kunsemiller/J.Burford/M.J.GumnsM.W.Rencheck/S.A.Greenlee/D.J.Garner/D.H.So/B.C.MickatavageJ.F:Stang,Jr.,-NRCWashington,DC,w/attachment AttachmenttoAEP:NRC:C0599-01RESPONSETOGENERICLETTER98-04 AttachmenttoAEP:NRC:C0599-OlPage1ResonsetoGenericLetter(GL)98-04Dated,Jul14,1998OnJuly14,1998,theNuclearRegulatoryCommission(NRC)issuedGL98-04regardingtheimpactofpotentialcoatingdebrisontheoperationofsafetyrelatedsystems,structures,andcomponents(SSC)duringapostulateddesignbasislossofcoolantaccident(LOCA).Protectivecoatingsarenecessaryinsidecontainmenttocontrolradioactivecontaminationandtoprotectsurfacesfromerosionandcorrosion.However,detachmentofthecoatingsfromthesubstratemayresultintheemergencycorecoolingsystem(ECCS)beingunabletosatisfytherequirementsof10CFR50.46(b)(5),i.e.,toprovidelong-termcooling,and-mayresultinthesafetyrelatedcontainmentspraysystem(CTS)"beingunabletocontrolcontainmentpressureandradioactivityreleasesfollowingaLOCA.TheGLrequestsinformationunder10CFR50.54(f)toevaluateaddressees'rogramsforensuringthatServiceLevel1protectivecoatings(coatingswhosefailurecouldadverselyaffecttheoperationofpost-accidentfluidsystems)insidecontainmentdonotdetachfromtheirsubstrateduringadesignbasisLOCAandinterferewiththeoperationoftheECCSandCTS.Thespecificrequestsareaddressedbelow.GenericLetterItem1reuiredthefollowin(1)Provideasummarydescriptionoftheplant-specificprogramorprogramsimplementedtoensurethatServiceLevel1'protectivecoatingsusedinsidethecontainmentareprocured,applied,andmaintainedincompliancewithapplicableregulatoryrequirementsandtheplant-specificlicensingbasisforthefacility.Includeadiscussionofhowtheplant-specificprogrammeetstheapplicablecriteriaof10CFRPart50,AppendixB,aswellasinformationregardinganyapplicablestandards,plant-specificprocedures,orotherguidanceusedfor:(a)controllingtheprocurementofcoatingsandpaintsusedatthefacility;(b)thequalificationtestingofprotectivecoatings;and(c)surfacepreparation,application,surveillance,andmaintenanceactivitiesforprotectivecoatings.Maintenanceactivitiesinvolvereworkingdegradedcoatings,removingdegradedcoatingstosoundcoatings,correctlypreparingthesurfaces,applyingnewcoatings,andverifyingthequalityofexistingcoatings.ResponsetoItem1TheCookNuclearPlantcontrolstoensurethatServiceLevel1protectivecoatingsusedinsidecontainmentmeetregulatoryrequirementsincludetheelementsdiscussedbelow.AllareadministeredundertheCookNuclearPlant'squalityassuranceprogram.

AttachmenttoAEP:NRC:C0599-01Page2ISpecificResponseto(1)(a)ProcurementofServiceLevel1coatingsusedfornewapplicationsorrepair/replacementactivitiesareprocuredfromavendorwithaqualityassuranceprogrammeetingtheapplicablerequirementsof10CFRPart50appendixB.Theapplicabletechnicalandqualityrequirementsthatthevendorisrequiredtomeetarespecifiedintheprocurementdocuments(e.g.,specificationspreparedinaccordancewithanapprovedprocedure,andpurchaseorders).AcceptanceactivitiesbyI&MpersonnelareconductedinaccordancewithproceduresthatareconsistentwithANSIN45.2,"QualityAssurance,ProgramRequirementsforNuclearPowerPlants,"requirements(e.g.,receiptinspection,sourcesurveillance,etc.).Thespecificationoftherequiredtechnicalandqualityrequirements,combinedwiththeacceptanceactivities,providesadequateassurancethatthecoatingsreviewedmeettherequirementsoftheprocurementdocuments.ThefollowingspecificationisusedfortheprocurementofServiceLevel1coatings.DCC-CEST-134-QCN,"Procurement,Receipt,StorageandDocumentationofProtectiveCoatings,"Revision,7.CoatingsonVendorSuppliedEquipment:CookNuclearPlantunits1and2haveamixofvendor-suppliedequipmentinsidecontainmentthatwasprocuredwith"acceptable"aswellas"indeterminate"and"unacceptable"coatings(asdefinedinreference1).Currently,therearenoproceduresinplacetotrack(e.g.,viaacoatingslog)theamountofindeterminateorunacceptablecoatingsinsidecontainment.Plantproceduresarebeingdevelopedtocontrolthequantityofindeterminateandunacceptablecoatingsinsidecontainment.CurrentplansaretohavetheseplantproceduresdevelopedbyOctober30,1999.SpecificResponsetoitem(1)(b)Qualificationtestingofcoatingsisperformedbythecoatingsvendor.TherequirementsforqualificationtestingofServiceLevel1coatingsusedfornewapplicationsorrepair/replacementactivitiesinsidecontainmentarecontainedinspecificationsandmeetthefollowingregulatoryguideandindustrystandards.RegulatoryGuide1.54,"QualityAssuranceRequirementsforProtectiveCoatingsAppliedtoWater-CooledNuclearPowerPlants,"June1973.ANSIN101.4,1972"QualityAssuranceforProtectiveCoatingsAppliedtoNuclearFacilities."

AttachmenttoAEP:NRC:C0599-01Page3ANSIN101.2,1972"ProtectiveCoatings(Paints)forLightWaterNuclearReactorContainmentFacilities,"applicabletoicecondenseronly.SpecificResponsetoitem(1)(c)Thesurfacepreparation,application,andinspectionofServiceLevel1coatingsusedinsidecontainmentareperformedinaccordancewithplantspecificationsandproceduresandareintendedtomeettheapplicableportionsofCookNuclearPlant'slicensingbasis.Documentationofcompletionoftheseactivitiesisperformedpertherequirementsoftheimplementingprocedures.AgeneralvisualexaminationofServiceLevel1coatingsinsidecontainmentisperformedduringeachrefuelingoranextendedoutageaspartof.theprotectivecoatingsinspectionprocedure.Whenlocalizedareasofdegradedcoatingsareidentified,theyareevaluatedandscheduledforrepairinaccordancewiththeprotectivecoatingsinspectionprocedurelistedbelow.Thefollowingspecificationsandproceduresareusedtocontroltheapplicationofcoatings.SpecificationsDCC-CEST-145-QCN,"PainterTraining,QualificationandCertification,"Revision4.ES-CIVIL-0408-QCN,"ProtectiveCoatingSystem:RequirementsforMaterialSelection,SurfacePreparation,ApplicationandInspection,"Revision0.Procedures800000-LTG-7400-01,"QualificationandCertificationofInspection,Test,Examination,AuditandNDEPersonnel,"Revision0.Thisprocedureprovidestheeducational,experience,physical,andcertificationrequirementsforinspectors.(227200-STG-5400-08,Revision0."ProtectiveCoatingInspection,"Thisprocedurespecifiesthatin-placeinspectionofcoatingsbeperformedduringeachrefuelingoutageandthattheinspectionmaybeperformedduringothermajoroutages.Theprocedurerequiresthatanassessmentofthecoating'sconditionbeperformed,aconditionreportbewrittenforsignificantdefectsanddeviations,andthataninspectionreportbeprepared.

AttachmenttoAEP:NRC:C0599-01Page412CHP5021;CCD.011,"ApplicationofProtectiveCoatingstoSteelSurfacesinAreasClassifiedasCoatingServiceLevel1andforCoatingServiceLevelIIILiningApplications,"Revision3.Thisprocedureprovidesinstructionsforsurfacepreparation,primecoatingapplication,finishcoatingapplication.Italsoprovidesacceptancecriteriaandaprovisionformanagementreview.12CHP5021.CCD.012,"ApplicationofProtectiveCoatingstoConcreteFloor,Wall,CeilingandBlockWallSurfacesinAreasClassifiedasCoatingServiceLevel1,"Revision2.Thisprocedureprovidesinstructionsforsurfacepreparationofconcretefloors,concretewalls,-ceilingsandblockwalls.Theprocedureprovidesinstructionsforsurfacerapplication,primecoatingapplication,andfinishcoatingapplication.Acceptancecriteriaandaprovisionformanagementreviewarealsoprovided.GenericLetterItem2reuiresthefollowin(2)Informationdemonstratingcompliancewitheitheritem(i)or(ii):Forplantswithlicensing-basisrequirementsfortrackingtheamountofunqualifiedcoatingsinsidethecontainmentandforassessingtheimpactofpotentialcoatingdebrisontheoperationofsafety-relatedSSCsduringapostulatedDBLOCA,thefollowinginformationshallbeprovidedtodemonstratecompliance:(a)Thedateandfindingsofthelastassessmentofcoatings,andtheplanneddateofthenextassessmentofcoatings.(b)Thelimitfortheamountofunqualifiedprotectivecoatingsallowedinthecontainmentandhowthislimitisdetermined.Discussanyconservatisminthemethodusedtodeterminethislimit.(c)Ifacommercial-gradededicationprogramisbeingusedatyourfacilityfordedicatingcommercial-gradecoatingsforServiceLevel1applicationsinsidethecontainment,discusshowtheprogramadequatelyqualifiessuchacoatingforServiceLevel1service.Identifywhichstandardsorotherguidancearecurrentlybeingusedtodedicatecontainmentcoatingsatyourfacility,or, AttachmenttoAEP:NRC:C0599-01Page5(ii)Forplantswithouttheabovelicensing-basisrequirements,informationshallbeprovidedtodemonstratecompliancewiththerequirementsof10CFR50.46(b)(5),"Long-termcooling"andthefunctionalcapabilityofthesafetyrelatedCTSassetforthinyourlicensingbasis.Ifalicenseecandemonstratethiscompliancewithoutquantifyingtheamountofunqualifiedcoatings,thisisacceptable.(a)IfcommercialgradecoatingsarebeingusedatyourfacilityforServiceLevel1applications,andsuchQualitycoatingsarenotdedicatedorcontrolledunderyourAppendixBQualityAssuranceProgram,providetheregulatoryandsafetybasisfornotcontrollingthesecoatingsinaccordancewithsuchaprogram.Additionally,explainwhythefacility'slicensingbasisdoesnotrequiresuchaprogram.ResonsetoItem2TheCookNuclearPlantdoesnothavealicensingbasisrequirementfortrackingtheamountofunqualifiedcoatingsinsidecontainment.Therefore,I&MisprovidingthefollowingresponsetoItem2(ii).Thefollowingdescriptionandreferencedmaterialdescribethelicensingbasisfortheplantrelativetoconformancewith10CFR50.46(b)(5),"LongTermCooling."Specifically,itaddressestheoperationoftheECCS,thefunctionofthesump,andtheregulatorybasisforassumingamaximumsumpblockageof50%.TheCookNuclearPlantiscurrentlyevaluatingtheadequacyofthesumpinventoryfortheECCSandCTSsystemsaspartoftherestartefforts.Thiseffort,althoughrelatedtothegenericletterconcerns,doesnotimpactthisresponse.Thus,thissubmittaldoesnotaddresseithertheECCSorCTSsystemissuesandresolutions.AnyactionsrequiredasaresultoftheECCS/CTSevaluationswillbeaddressedasapartoftherestarteffort.TheoperationoftheECCSfollowingaLOCAisdividedinto2phases:1)theinjectionphaseinwhichanyreactivity"increaseattendingtheaccidentisterminated,initialcoolingofthecoreisaccomplished,andthecoolantlostfromtheprimarysystemisreplenished;and2)therecirculationphaseinwhichlongtermcorecoolingisprovidedduringtheaccidentrecoveryperiod.Thepotentialimpactofthedegradationofprotectivecoatingsusedinsidecontainmentwouldoccuronlyduringtherecirculation AttachmenttoAEP:NRC:C0599-01Page6EphasewhenthewaterrequiredbytheECCSandtheCTSisobtainedfromtherecirculationsump.Thesumpdesignprovidessufficientflowareaoverthetrashcurbaheadofthesumpandadequatenetpositivesuctionheadfortheresidualheatxemoval(RHR)andCTSpumpstooperateintherecirculationmode.Waterflowingintothesumppassesthroughthecoarseandfinescreensanddownwardsunderthecranewall.TheflowisthenturnedupwardsandentersthetwinrecirculationpipesconnectingthesumptotheRHRandCTS.Theadjacentcontainmentsumpisalsoequippedwithcoarseandfinescreensatitsentrance.Thecontainmentandtherecirculationsumpsareconnectedviaan8-inchpipenearthebottomofthesumps.Therecirculationsumpisprotectedattheentrybycoarseandfinescreenssupportedwithinasubstantialframe.Thecoarsescreen(grating)isinstalledinfrontofthesumptopreventlargematerialsfrompassingandthefine(1/4-inchmesh)screenisintendedtostopmaterialcapableofpluggingthe3/8-inchcontainmentspraynozzles.Additionally,thecontainmentsumpentranceisalsoprotectedwithacoarsescreenand1/4inchwiremeshinasimilarmanner.Fortherecirculationsump,thescreensactasflowstraightenersandmitigatevortexformationbyequalizinglocalvelocitydifferences.Additionally,thesumpisdesignedwitharelativelylargeflowarea,allowinglowwatervelocities,suchthatbuild-upofdebrisagainstthescreensisminimized.Thelowvelocitiesmakeitunlikelythatairbubblesenterintothepumpsuctionareaofthesump.AsnotedintheNRCsSafetyEevaluationReport(SER)datedJuly2,1982thecontainmentrecirculationsumpdesignmeetstheintentoftheapplicablesectionsofRegulatoryGuides1.68,1.79,and1.82,Revision0.InconformancewithRegulatoryGuide1.82,Revision0positionC.7,50$oftheeffectivesumpareawasconsideredtobeblockedbyLOCAgenerateddebris.Atthetimethattheplantwaslicensed,nodistinctionwasdrawnbetweenthevariouspotentialsourcesofpost-LOCAdebris;thesesystemswereintendedtofunctionwithdebrisfromanysourcepartiallyobstructingthesumpsand50%blockagewasconsideredtobeaconservativeestimateofpotentialsumpblockage.Theanalysesandmodeltestingresultssubmittedaspartofthelicensi'ngbasisfortheplantdemonstrate,that,evenwith50%ofeffectivesumpareablockage,theECCSandCTSwillcontinuetoprovidesufficientcoolingflowtofulfillthelong-termcoolingfunctionsrequiredtoconformwith10CFR50.46(b)(5).Thecontainmentrecirculationsumpdesignwasmodel-testedattheAldenResearchLaboratoriesinthelate1970stoevaluateairentrainmentandvortexingconcerns.Thesetestsdeterminedthatthemodifications,asprescribedbya1978Aldenstudy,wouldbe.effectiveinassuringacceptablesumpperformance.Additionally,empiricaldatafordeterminingtheheadlossatthesumpentrancewereobtainedforsumpblockagesupto50%ofthescreenarea.

AttachmenttoAEP:NRC:C0599-01Page7ThesetestresultsandNRCrequestsforsupplementaryinformation~weresubmittedtotheNRCviareferences2and3.TheNRCreviewedthetestresultsandthesupplementaryinformationandissuedaSERdatedJuly2,1982.TheSERstatesinpart,"Basedontheapplicant'simplementationofthesumpmodificationsasrecommendedbytheSeptember1978andDecember1979reportsandacceptableresultsreportedintheApril28,1982submittal,we-findthesetestsmeettheintentofapplicableportionsofRegulatoryGuide1.68,1.79,and1.82,andarethereforeacceptable."Theplant'slicensingbasis,asacceptedbytheNRC,asdescribedintheSERprovidestheregulatoryandsafetybasisfortheECCSandCTSsystems.Ourcoatingsarenottreatedasaseparatedebrissourceinthepreviouslydescribedlicensingbasis.Additionally,thesumpscreen50%blockageassumptiondoesnotdifferentiatebetweenthesourcesfortheLOCAgenerateddebris.SpecificResponsetoItem(2)(ii)(a)TheplantdoesnotusecommercialgradecoatingsinsidecontainmentforServiceLevel1applications.

References:

1.EPRITR-109937,"GuidelineonNuclearSafety-RelatedCoatings,"datedApril1998.2.LetterAEP:NRC:0112,J.TillinghasttoH.R.Denton,datedDecember20,1978.3.LetterAEP:NRC:0355A,"CONTAINMENTRECIRCULATIONSUMPTEST,",datedApril28,1982.

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