ML17334B053

Proposed Tech Spec Changes Increasing Allowed Peak Pellet Exposure for Advanced Nuclear Fuel Corp Fuel

ML17334B053
Person / Time
Site:	Cook
Issue date:	02/20/1987
From:	INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
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t'@*44~~'"+S~)~~W,<<,t.k~'-J}~,...~aI,q~,'I~!~~w+i'=<il'J'Ii}"~)aw<v'~'L4s:~~VAttachment2toAEP:NRC:1018ProposedRevisedTechnicalSpecificationPages8703030051870220PDRADOCK050003i5PPDR 0POWERDISRIBUTIONLIMITSSURVEILLANCEREQUIREMENTS(Continued)whereF(Z)-F(Z,g,)atg,forwhichF(Z,t)T(E,)F(Z)F(E)isamaximumatRforwhichF(Z,t.)isamaximumT(EE)F(Z)andF(Z)arefunctionsofcoreheight,Z,andcorrespondateachLF(Z,i)ZtotherodiforwhichT(E)isamaximumatthatZV(Z)isacycledependentfunctionandisprovidedinthePeakingFactorLimitReport.K(Z)isdefinedinFigure3,2-2forExxonNuclearCompanyfuelandinFigure3.2-3forWestinghousefuel.T(E)isdefinedinFigures3.2-4and3.2-f.Ep(Z)isanuncertaintyfactortoaccountforthereductionintheF(E<)curveduetoaccumulationofexposurepriortothenextfluxmap.WestinhouseFueE(Z)1.0PEp(Z)1.0ExxonNuceaCoueEP(Z)1.0EP(Z)1'0+[.0040xF(Z)]0.0<EE<17.6217.62<ER<34.5E(Z)1.0PEp(Z)10+f0093xP(Z)jEp(Z)-1.0+[.0060xF(Z)jE(Z)1.0P34.5<E<42.242.2<E<48.048.0<E<51.0lD.C.COOK-UNIT13/42-7AMENDMENTNO.s~e~P POWERTIBUIONLIIeLIMITINGCONDITIONFOROPERATION(Continued)'SesttuhouseFuel~NCFuaF-1.0F1.0PF-1.0PF-1.0PFP1.0+[.0015xW]F1~0+[.0033xW]Fp1.0+[.0020xW]F1.0P0.0gE~<17.6217.62<ER<34.534.5<E<42.242.2<E<48.048.0<E<51.0whereWisthenumberofeffectivefullpowerweeks(roundeduptothenexthighestinteger)sincethelastfullcorefluxmap.indicatedbytherelationships.**"-F(Z,g,)xV(Z)x100%WestinghouseFuelAPLminoverZofF(E)xK(Z)x100$ExxonNuclearCo.FuelLF(Zg)xV(Z)xEp(Z)whereF(Z,g)isthemeasuredF(Z,g,),includinga3%manufacturingtoleranceuncertaintyanda5%m9asurementuncertainty,atthetimeoftargetfluxdeterminationfromapowerdistributionmapusingthemovableincoredetectors.V(Z)isthefunctiongiveninthePeakingFactorLimitReport.Theabovelimitisnotapplicableinthefollowingcoreplaneregions.1.Lowercoreregion0%to10%inclusive.2.Uppercoreregion90%to100%inclusive.*TheAPDMSmaybeoutofservicewhensurveillancefordeterminingpowerdistributionmapsisbeingperformed.D.C.COOK-UNIT13/42-20AMENDMENTNO.

2.22.1(0,2.04)(17.62,2;04)2.0~-'===-:(34.5,1.95)-(42.2,1.86)~1.94CV1.81.7LFQ(ER)LFQ(Ea)LFQ(Ea)0.0<ER<17.62==2.134-.005333Ep,17.62<Eg,<34.5=2.353-.01169Ea34.5<Eg,<42.2(48.0,1.82)(51.0,1.82)1.61.5LF(ER)=2.151-.006897KQF(EI)~182Q42.2<EK<48.048.0<EK<51.01.0~9(0,1.0)(17.62,1.0)~~'~~(34.5,0.956).0,0.:(42.2,0.912)~=(48892).8.7T(Eg,)~1.0T(ER)~1.046-.002614ERT(Eg,)~1.154-.00573Eg,T(Eg,)=1.054-003381Eg,T(Eg,)~0.8920.0(ER17.62<E(34.5<Eg,42.2<EE48.0<Ea<17.62:--=~<34.5'42.2<48.0<51.0.rI'(51.0,0.892',.6II~~tl~~=~~~0102030PeakPelletExposureini&Q/KG4050FIGURE3.2-4ExposureDependentFQLimit,FL(Eg),andNormalizedLimitT(ER)asafunctionofPeakPPlletBurnupforExxonNuclearCompanyFue)D.C.COOK-UNIT13/42>>23A,KNDHENTNO.

Attachment3toAEP:NRC:1018ANFEvaluationofLOCAConsiderations~~<<,'

NQV.f].'Stg1S:4sE78+ONNUCLEARCOMPANY,INC.600100THAVEffVK>C.POSOXS0777.SSU.EVIlK.WASS009(2N>GO~00November11,1986ENC/AEP-0535Hr.RickBennett,EngineerNuclearHater1als5FuelHanagementInd1ana5HichiganElectricCompanyc/oAmericanElectricPowerServiceCorp.OneRiversidePlaza,20thFloorColumbus,OH43216-6631

DearHr.8ennett:

AttachedisarecommendedchangetotheD.C.CookUnitlTechnicalSpecificationonFtoallowoperationofENCfueltopeakpelletexposuresofglGGD)NT.Adustificationofthischangeisalsoattachedforyouruse1nobtainingNRCapprovalforth1schange.Ifyouhaveanyquestionsregardingtheattachment,pleasecontactourHr.J.S,Holm(telephone509375-8142).~SincerelyA'.~H.G.ShawContractAdministratorAttachmentcc:H.P.AlexfchJ.H.ClevelandD.H.MalinY.YanderBurgJ.S.Holm(ENC)RARlPAPtPAGB/'Pa.,ass,,srgCfgsa0~00sse0stafs0ss

/f40Vli'.8615'47E7P.3.C.CKRef:(1)XN-NF-85-115,Rev.),"D.C.CookUnit1LimitingBreakK(Z)LOCA/ECCSAnalysis,"November1986.(2)XN-NF-85-68(P),Rev.1,"DonaldC.CookUnit2LimitingBreakLOCA/ECCSAnalysis,lOXSteamGeneratorTubePlugging,andK(Z)Curve,"April1986.(3)XN-NF-85-117,Supp.1)"St.LucieUnit1RevisedLOCA/ECCSAnalysiswith15%SteamGeneratorTubePlugging8reakSpectrumandExposureResults,"December1985,ALOCA/ECCSanalysisJustifyingtheoperationofENCfuelcurrentlyintheD.C.CookUnit1reactorispresentedinReference1.TheanalysisinthatreportsupportsapeakF~of2.04withanaxialdependenceasshowninFigure1.ThisanalysisisapplicabletotheENCfuelcurrentlyintheD.C.CookUnit1reactor,withaminimumpeakrodaverageexposuregreaterthan20GWd/HTandanticipatedtobelessthan47GWd/HT.JustificationforanexposuredependentF~forD.C.CookUnit1isbasedonanexposureanalysisforD.C.CookUnit2(Reference2).Peakcladdingtemperaturesaredependentuponfuelrodinitialstoredenergy,whichfortheEXEH/PMRmodelsincreasesfrom0toabout2GWd/HTHandthendecreaseswithexposure.TheanalysisforD.C,CookUnit2with17x17fuelgeometrydemonstratedthatovertheexposurerangeof0to41GMd/HTH,thepeakcladdingtemperaturedecreasedwithexposureforexposuresbeyondthepeakstoredenergyexposure.AsimilartrendwasobservedforSt,LucieUnit1with15x15fuelgeometry(Reference3).SimilarresultswouldbeexpectedforD.C.CookUnit1with15x15fuelgeometryusingEXEH/PWRmodelsBasedonthetrendofdecreasingpeakcladdingtemperaturewithincreasingexposure,theanalysisinReference1isconservativeandsupportsanFofatleast1.95forENCfuelatpeakrodaverageexposuresbetween20anII47GMd/HTH,Apeakrodaverageexposureof47GMd/HTHisequivalenttoapeakpelletexposureof51GWd/HTH.TherecommendedD.C.CookUnit1exposuredependentFTechnicalSpecificationFigure3.2-4isattached.ThisfigureisthetameasthefigureinthecurrentD.C.CookUnit1TechnicalSpecificationbu'iththeadditionofaconstantFlimitof1.82from48.0GWd/HTto51GWd/HTpeakpelletexposure,Forc3)nsistencywiththecurrentD.C.CookUnit1TechnicalSpecification,thecurvehasbeenmaintainedintermsofpeakpelletburnvp,HAPlFAXNO'PAGEAT'TN.

I.21.D(6.0,1.0)DO0f2345I780,18ki12COREHEIGHTCFT>P~OFigure1IhtChannelFactorNormalizedOperatingEnvelope,Fq=2.04,K{Z)Function 2.2Z.l2.0(0,2.04)(,17.62,2.04)(34.5,1.95)1,9(42.2,1.86)1.71.61.5Ft(EE)"2.04Fq(Ea)=2,134-.005333Eg,F)(ER)~2.353-.0115955Fq(Ek)=2.151-.006897EaLFq(ER)=1.82L0.0<E9.<17.617.62<EK<34.534.5<ER<42,242.2<,Eg,<48.048,0<Ea<51.0(48.0,1.82)(51.0,1,821,0(17.62,1.0)(34,5,.956)(42.2,.912)(48.0,.892)(51.0,.89.8.7T{Ea)-1.00.0<Eg<17.62T{Eg,)=1.046-.002614Eg,17.62<ER<34.5T(EI()1,154-,00573ER34.5<EIl,<<42,2T(Eg)~1,054-.003381Q,42.2<Eg.<48.0TEg,)0.89248.0<EE<51.01020PeakPelletExposurein%ID/KG405060Figure3.2-4ExposureOependentFqLimit,Fq(Ea),andNormalizedLimit~LT(ER)asafunctionofPeakPellet8urnupforExxonNuclearCo..panyF.e1O.C.Cook-Unit13/42-23AmendmentNo.RAPIFAXATTIL4 AFFIDAVIT*STATEOFWASHINGTON)ss.COUNTYOFBENTON)I,H.E.Williamsonbeingdulysworn,herebysayanddepose:l.IamManager,LicensingandSafetyEngineering,forAdvancedNuclearFuelsCorporation("ANF"),andassuchIamauthorizedtoexecutethisAffidavit.2.IamfamiliarwithANF'sdetaileddocumentcontrolsystemandpolicieswhichgoverntheprotectionandcontrolofinformation.3.IamfamiliarwiththeLetterHGS-87-55(P)entitled"DCCookUnitIPeakPelletBurnupExtension"referredtoas"Document."InformationcontainedinthisDocumenthasbeenclassifiedbyANFasproprietaryinaccordancewiththecontrolsystemandpoliciesestablishedCbyANFforthecontrolandprotectionofinformation.4.Thedocumentcontainsinformationofaproprietaryandconfidentialnaturean'disofthetypecustomarilyheldinconfidencebyANFandnotmadeavailabletothepublic.Basedonmyexperience,IamawarethatothercompaniesregardinformationofthekindcontainedintheDocumentasproprietaryandconfidential,5.*TheDocumenthasbeenmadeavailabletotheU.S.NuclearRegulatoryCommissioninconfidence,withtherequestthattheinformationcontainedintheDocumentwillnotbedisclosedordivulged.

6.TheDocumentcontainsinformationwhichisvitaltoacompetitiveadvantageofANFandwouldbehelpfultocompetitorsofANFwhencompetingwithANF.7.TheinformationcontainedintheDocumentisconsideredtobeproprietarybyANFbecauseitrevealscertaindistinguishingaspectsofPWRFuelDesignmethodologywhichsecurecompetitiveadvantagetoANFforfueldesignoptimizationandmarketability,andincludesinformationutilizedbyANFinitsbusinesswhichaffordsANFanopportunitytoobtainacompetitiveadvantageoveritscompetitorswhodonotormaynotknoworusetheinformationcontainedintheDocument.8.ThedisclosureoftheproprietaryinformationcontainedintheDocumenttoacompetitorwouldpermitthecompetitortoreduceitsexpenditureofmoneyandmanpowerandtoimproveitscompetitivepositionbygivingitextremelyvaluableinsightsintoPWRFuelDesignmethodologyandwouldresultinsubstantialharmtothecompetitivepositionofANF.9.TheDocumentcontainsproprietaryinformationwhichisheldinconfidencebyANFandisnotavailableinpublicsources.10.InaccordancewithANF'spoliciesgoverningtheprotectionandcontrolofinformation,proprietaryinformationcontainedintheDocumenthasbeenmadeavailable,onalimitedbasis,toothersoutsideANFonlyasrequiredandundersuitableagreementprovidingfornon-disclosureandlimiteduseoftheinformation.11.ANFpolicyrequiresthatproprietaryinformationbekeptinasecuredfileorareaanddistributedonaneed-to-knowbasis.

12.ThisDocumentprovidesinformationwhichrevealsPWRFuelDesignmethodologydevelopedbyANFoverthepastseveralyears.ANFhasinvestedthousandsofdollarsandseveralman-monthsofeffortindevelopingthePWRFuelDesignmethodologyrevealedintheDocument.AssumingacompetitorhadavailablethesamebackgrounddataandincentivesasANF,thecompetitormight,ataminimum,developtheIinformationforthesameexpenditureofmanpowerandmoneyasANF.THATthestatementsmadehereinaboveare,tothebestofmyknowledge,information,andbelief,truthfulandcomplete.FURTHERAFFIANTSAYETHNOT.SWORNTOANDSUBSCRIBEDbeforemethis~d~dayof198.NOfARYPUBLIC y~

Attachment5toAEP:NRC:1018ANFEvaluation(Non-Proprietary)ofMechanicalDesignConsiderationsforPeakPelletExposuresupto48.7Mwd/kg x*NON-PROPRIETARYx*HGS-87-055(P),Attachment2Page1of2DCCookUnit1-PeakPelletBurnuExtensionBBackBround:ThelastreloadofANF(formerlyENC)fuelsuppliedfortheDCCookUnit1reactoriscurrentlyinitslastcycleofoperation.Aburnupextensionanalysishadbeenperformedforthisfuelin1984inordertosupportburnuplevelsof41.0,43.7,and48.0GWD/MtUrespectivelyforpeakassembly,peakrod,andpeakpellet.Reactoroperatingconditionssincethattimehaveresultedinhigheraxialpeakingthanoriginallyprojected.Consequently,thepeakpelletburnupisnowexpectedtoapproachalevelof48.5GWD/MtU.Thepeakrodandpeakassemblyburnuplevelsarenotaffected.Areviewoftheoriginalanalysessupportingtheburnupextensionhasbeenconductedinordertodeterminetheconsequencesofanincreaseinpeakpelletexposure.Thereviewconsideredanadditionalincreaseinpeakpelletexposureto48.7GWD/MtUtoprovidemarginfor.apotentialendofcyclecoastdown.Summar.ofBurnuExtensionAnalysisReview:Theoriginalburnupextensionanalysi,s,reportedinXN-NF-84-25,Rev.0(Reference1),addressedthefollowingaspectsofdesign:(1)SteadyStateStress,(2)SteadyStateStrain,(3)CladdingCorrosionandHydrogenAbsorption,(4)TransientStressandStrainandCladdingFatigue,(5)CladdingCreepCollapse,(6)FuelRodInternalGasPressure,(7)FuelRodGrowth.(8)SpacerSpringForce,and(9)FuelAssemblyGrowth.Ofthese,onlySteadyStateStrain,CorrosionandHydrogenAbsorption,andFuelRodInternalPressurearesignificantlyaffectedbytheaxialprofileofthefuelrod.Theremainderoftheitemsareessentiallyindependentofthepeakpelletexposure.TheresultsreportedinXN-NF-84-25,Rev.0remainvalidfortheseitems.Thepowerhistoryusedfor.theoriginalburnupextensionanalysiswasbasedonaconservativebest-estimateofthemaximumdischargeexposurerod,assumingfullpoweroperation.Inrealitytheoperationofthereactorhasbeenlimitedto90percentoffullpower.Therefore,theoriginalpower.historyprojectionrepresentsaboundingcasefor.thisfuel.Therevisedanalysisshowsthatcladstrain,corrosionandhydrogenabsorptionremainwithinthedesignlimits,andthefuelrodpressureremainsbelowsystempressure.

'krNON-PROPRIETARYx+HGS-87-055(P),Attachment2Page2of2SteadStateStrain,CladdinCorrosionandHdroenAbsortion:Themaximumcladdingstrain,corrosionandhydrogenabsorptionweredeterminedtooccuratthepeakaxialregionintheoriginalburnupextensionanalysis.Reviewofthisanalysisshowedtheresultsfromthepreviousanalysistohavebeentakenfor.apeakpelletexposureof48.3GWD/MtU.Becauseofthesubstantialmarginforthesedesigncriteriaasimpleextrapolationwasusedtoprojecttheconditionsforapeakpelletexposureof48.7GWD/MtU.Extrapolatingtheresultsoftheoriginalanalysisandincludinganuncertaintyoffivepercentyieldsthefollowingresults:~Pr'o'ctedCriteriaTotalPositiveStrain,(0)MaximumPositiveStrainIncrease,(8)CladdingCorrosion,(inch)HydrogenAbsorption,(ppm)Therefore.thefuelwillremainwellwithinthecriteriafortheseitems.FuelRodInternalPressure:AnewRODEX2.(Reference2)analysiswasperformed.usingtheapprovedmethodologyfor'nternalgaspressuredeterminationandtheboundingpower,history.Theaxialpeakingfactorfromtheoriginalextensionanalysiswasincreasedby2'8atthemaximumaxialregioninordertoboundthe1.5%increaseinhurnupfrom48.0to48.7GWD/MtU.Theresultsofthisanalysisshowedapealeinternalpressureof(]psiaoverthedesignlifeofthefuel.Thisvalueiswellwithinthecriterialimitofthe2250psiareactoroperatingpressureasgiveninXN-NF-84-25,Rev.0.Conclusion:ReviewoftheanalysisfortheANFfuelsuppliedtotheDCCookUnit1reactorhasshownthefuelcapableofmeetinga11designcriteriaatapeakpelletexposureof48.7GWD/MtU.TheresultspresentedintheextendedburnupreportXN-NF-84-25.Rev.0withtheadditionoftheresultspresentedinthisletterremainvalidforthefuel.Ref:(1)XN-iVF-84-25.Revision0,MechanicalDesi.nReortSulement.forDCCookUnit1ExtendedBurnuFuelAssemblies,April1984.4(2)XN-NF-81-58{P)(A)~Revision2.RODEX2FuelRodThermal-MechanicalResonseEvaluationModel,March1984.