ML17334A816
| ML17334A816 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/23/1984 |
| From: | INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | |
| Shared Package | |
| ML17334A815 | List: |
| References | |
| NUDOCS 8409050174 | |
| Download: ML17334A816 (18) | |
Text
Mr.HaroldR.DentonAEP:NRC:0745MAttachmentAProposedRevisedTechnicalSpecificationsPagesforD.C.CookUnitC090100g7gy08R>PDRADOCK05000315PDR
~1f
~~~~~~~~lg~J~,~~~~~'~~I~~~~~~~~~~~~~'~'~~~~~~~t~~~~~~~~~'
POWEROISTRIBUTIONLIMITSLIMITINGCONOITIONFOROPERATION(Cont1nued)2.ReduceTHERMALPOWERasnecessarytomeetthelimitsofSpecfffcatfon3.2.6usfngtheAPOMSwiththelatestfncoremapandupdatedR.b.Identffyandcorrectthecauseoftheout,oflimitcond1t,fonpr1ortafncreasfngTHERMALPOWER;THERMALPOWERmaythenbefncreasedprovidedF~fsdemonstratedthorough1ncoremappingtobew1thfnftslfmft.SURVEILLANCEREUIREHENM4.2.2.1TheprovfsfonsofSpecification4.0.4arenotapplicable.4.2.2.2F~(Z,i)shallbedeterminedtobewithinftslimitby:a.Usfngthemovablefncoredetectorstoobtainapowerd1stributfonmapatanyTHERMALPOWERgreaterthanSXofRATEDTHERMALPOWER.b.IncreasingthemeasuredF~(Z,t)componentofthepo~erdistributionmapby3XtoaccountformanufacturingtalerancesandfurtherincreasingthevaluebySXtoaccountformeasurementuncertafntfes.ThisproductfsdefinedasF~(Z).c.Satisfyingthefollowfngrelationshipsatthetimeofthetargetfl.uxdetermination.WestfnhouseFuelExxonNuclearCa.FuelFq(Z)~2.10PxE(Z~KZV(Z)F<(Z)<LF,(Z)~xvZ)P>0.5V(X)Fq(Z)4.20E(Z)K(Z)vvv'<O.SD.C.CookUnit13/42-6Attendant"o POWEROISfRIBUTIOHLIMITSSURVEILLANCEREgUIREMEHTS(Continued)whereF~(z)=F~(z,a)attforwhichF(Z,x)3samaximumT(E)F<(Z)=F<(E,)attforwhich~F(z,a)T(E)isamaximumF~(Z)andF~(Z)arefunctionsofcoreheiaht,Z,andF(Z,a)correspondateachZtotherod4forwhichT(Eisamaximu'matthatZV(Z)isacycledependent,functionand.isprovidedinthePeakingFactorLimitReport.QZ)isdefinedinFigure3.2-2forExxonNuclearCompanyfuel'andinFigure3.2-3forWestinghousefuel.T(E<)isdefinedin~Figures3.2-4and3.2-5.E(Z)isanuncertaintyfactortoaccountpforthereductionintheF~(E)curveduetoaccumulationofLexposurepriortothenextfluxmap.I,/l<estinqhouseFuelExxonNuclearCo.FuelE,(z)=l.oE(Z)=1.0E,(z)=l.oD.C.CookUnit1E,(z)=l.oE(Z)=1.0+I.0040xPE(Z)=1.0+[.0093xE(Z)=1.0+L.0060x3/42-70.0F(Z)]17.62FO(Z)]34.5F<(Z)]42.2AmendmentNo.EE<17.62<ER<'34.5<ER<422<ER<48.0
'~H~~~IIi~~~~~~~~~~~,~~~I~~~~I~I~IV~~~~I~Ilt~~I~I~~~~~~~~.~~~~~~~~II~~~'I 121.0(0.0,1.0)(6.0,1.0)[~~~~I1~LLiI(11.183,0.935)0.812.0,0.714)0.60'.4I~~~~~~~~i'~~I&02I~I~~[~~L0.004l~'46CoreHeight(FT)10I~12FIGURE3.2-3K(Z)-NormalizedF(Z)AsAFunction'fCoreHeightForWestinghouseFuel0.C.Cook-Unit13/42-11AmendmentNo.
~~~~~~~~'~~~~~~'~~'Dl~~Q~~~~~~~~~~~~~~~~~~~~~~~
~~I':~~~IIliiiI~'~~~~~~~~~~~~0l~,~~~~'~~~~~I~.~~~I~.~~~~~~~~~~~~~~~\~~~~~~I~I'~~ll~I~~~~~~~~~~'~~~~I 2.22'0204)(17.62,2.04)2.0{34.5,1.95)1.9u1.81.71.6L=-FqLFq--FLgL.=-gFq(Ea)=2.0400<Ea<1762(Ea)=2.134-.005333ER17.62<Ea<34.5(ER)=2.353-.01169ER34.5<ER<42.2{Ea)=2.151-.006897ER42.2<Ea<48.0(42.2,1.86)=.'."(48.0,1.82)~~~151.094J.8~~~Ic~~-p~'I~~~4I~~~~~~.17.62,1.0)34.5,.956)t-(42.2~912)(480,.892).7.6.0=1.046-.002614ER=1.154-.00573ER=1.054-.003381Ea0.0<Ea<17.17.62<ER<34.345<ER<42.42.2<ER<48.62=--52':0I*4~~'-k>>~~II1020304050PeakPelletExposureinHklD/KGFjGURE3.2-4ExposureDependentF~Limit,F0{Ea),andNormalizedLimitT(Ea)asafunctionofPeakPelletBurnupforExxonNuclearCompanyFuelD.C.Cook-Unit13/42-23AmendmentNo.
2.22.12.0(0.0,2.10)(42.2,2.10)1.91.8t'1.71.6~~1.0~--~+-~I~~tL-:(O.o,l.no)P~~(42.2,1.00)=0.80.7~~I01020304050PEAKPELLETEXPOSUREINMLlD/KGFIGURE3.2-5.ExoosureDeoendentFOLimit;F~(ER),'"andNormalized.LimitT(ER)asaFunctionofPeakPelletBurnuoforl<estinghouseFuelD.C.Cook-Unit13/42-24AmendmentNo.
Mr.HaroldR.BentonAEP:NRC0745MAttachmentBEnvironmentaland10CFR50.92justificationsforthoseTechnicalSpecificationschanges(enclosedinAttachmentA)associatedwiththeextensionofthepeakpelletburnupallowedinfuelsuppliedbyExxonNuclearCompany.
Mr.HaroldR.DentonB-1AEP:NRC:0745MTheJustificationforanincreaseintheallowedpeakpelletburnupinfuelsuppliedbyExxonNuclearCompany(ENC)from42,200MWD/MTU(42.2MWD/KG)to48,000MWD/MTU(48.0MWD/KG)isbasedonanalysesperformedonthemechanicaldesign,LOCA-ECCSanalysis,andreviewofsignificanthazardsandenvironmentalconsiderations.Mechanicaldesignanalysesforextendedburnupto48,000MWD/MTU(48.0MWD/KG)wereperformed.TheresultsoftheseanalysesarepresentedinXN-NF-84-25(P),April,1984.XN-NF-84-25(P),April,1984,statesthatallcurrentENCdesigncriteriaaresatisfied.Thesecriteriaarerepeatedbelow:oThemaximumend-of-life(EOL)steady-statecladdingstrainwasdeterminedtobenegative,thu'smeetingthe1.0$designlimit.Thecladdingstressandstrainduringpowerramps,calculatedunderdifferentoverpowerconditions,donotexceedthedesignstresscorrosioncrackingthresholdorthe1.0$strainlimit.Thecladdingfatigueusagefactorof0.20iswithinthe0.67designlimit.Theend-of-lifefuelrodinternalpressureislessthanthesystempressure.Thecladdingdiameterreductionduetouniformcreepdownpluscreepovalityafterfueldensificationislessthantheminimuminitialpellet/cladgap.Thiscriterionpreventstheformationoffuelcolumngapa.ThemaximumcalculatedEOLthicknessoftheoxidecorrosionlayerislessthan0.0007inch,andthemaximumcalculatedconcentrationofhydrogeninthecladdingis80ppm.Thesevaluesarewithinthedesignlimitsof0.002inchand300ppm,'espectively..Anevaluationofthefuelassembly,growthand'thefuelrodgrowthindicatesthatthefuelassemblydesignprovidesadequateclearancesatthedesignburnup.
Mr.HaroldR.DentonB-2AEP:NRC:0745MDataontheperformanceofsimilarENCfuelathighburnupscanbefoundinXN-NF-82-06,"Qualification.ofExxonNuclearFuelforExtendedBurnup",June,1982.LeadassembliesatH.B.Robinsonhavebeenburnedtoassemblyaverage'xposuresof-approximately48,000MWD/MTU(48.0MWD/KG).ALOCA/ECCSanalysiswasperformedtoextendthepeakpelletexposurefrom42,200MWD/MTU(42.2MWD/KG)to48,000MWD/MTU(48.0MWD/KG).TheresultsoftheseanalysesarepresentedinXN-NF-83-61,August,1983,whichextendstheanalysespresentedinXN-NF-81-07,February,1981.Theend-of-lifecalculatedpeakcladdingtemperature(PCT)is1736F,occurring262secondsintotheaccidentatalocation$.25feetfromthebottomoftheactivecore.Assuminga42FincreaseinPCTfromanearliersensitivitystudyforaconservativeestimateofmaximumLPSIflow,thePCTwillbe1778F.TheanalysisofthelimitingbreakfortheD.C.CookUnit1reactorwiththeENCWREM-IIAandselectedEXEM/PWRECCSevaluationmodelsshowsthatthereactorcanoperateatallowedtotalpeakingFof1.82andFHof1.55atapeakpelletburnupof48,000MWD/kTU(48.0MWD/KG)andcontinuetomeetthe10CFR50.46criteriawithanalysesperformedinconformanceto10CFR50AppendixKrequirements.InaDecember,1982memofromL.G.Hulman,ChiefNRC-AccidentEvaluationBranch,toCarlBerlinger,Chief,NRC-CorePerformanceBranch,L.G.HulmansuggestedthattheAccidentEvaluationBranchneednotbeinvolvedinreloadanalysisaslongasbatchaverageburnuplevelsdonotexceed38,000MWD/MTU(38.0MWD/KG)atdischarge.ThefuelsuppliedbyExxonNuclearCompanywhichiscurrentlyinDonaldC.CookNuclearPlantUnit1Cycle8isinRegion8andRegion9.ThefuelinRegion8whichwillbedischargedattheendofCycle8hasadesignbatchaverageburnupof32,600MWD/MTU(32.6MWD/KG).TheremainingRegion8fuelwillbecompletelydischargedattheendofCycle9withadesignaverageburnupof33,007MWD/MTU(33.007MWD/KG)forthatbatch.ThefuelinRegion9willbecompletelydischargedatthe.endofCycle9withadesignbatchaverageburnupof34,061MWD/MTU(34.061MWD/KG).ReactorcoolantsystemactivitydataforUnit1Cycle8indicatesthatsomefuelassembliesareleaking,whichwillresultinsomedesignchangesforUnit1'Cycle9,withminoreffectsonthedesignbatchaverageburnupsat'ischaige.-Therefore',thefuelsuppliedbyExxon'uclearCompanywillnotexceed38,000MWD/MTU(38.0MWD/KG)batchaverageburnupsatdischarge,eventhoughthepeakpelletburnupmaybeupto48,000MWD/MTU(48.0MWD/KG).
Mr.HaroldR.DentonB-3AEP:NRC:0745MOnthebasisoftheaboveevaluations,webelievethattheTechnicalSpecificationschangesassociatedwithextendingthepeakpelletburnupfrom42,200MWD/MTU(42.2WD/KG)to48,000MMD/MTU(48.0MWD/KG)donotconstituteasignificanthazardsconsiderationunder10CFR50.92.Mehavefurtherconcludedthattheextendedburnupwillnotadversely.affecttheenvironmentsince'twillnotresultinradiologicalconsequencesgreaterthanthosepreviouslyanalyzed.
Mr.HaroldR.DentonAEP:NRC:0745MAttachmentCReasonsfortheincreaseinFforfuelsuppliedbyWestinghouse.
Mr.HaroldR.DentonC-1AEP:NRC:0745MTheJustificationforanincreaseintheF<allowedinfuelsuppliedbyWestinghouseto2.10isbasedonalargebreakanalysiswhichwasperformedwiththeDecember1981versionoftheEvaluationModelmodifiedtoincorporatetheBARTcomputercode.TheanalysisspecifictoDonaldC.CookNuclearPlant,Unit1isincludedasAttachmentDtothisletter.ThemostlimitingsinglefailurewhenoffsitepowerisunavailableforD.C.CookUnit1isanalyzedwithmaximumsafeguardsbecausethecurrentAppendixKmodelsgivemorelimitingresultsassumingthemaximumpossibleECCSflowdelivery.Inthatcase,maximumsafeguardswhichassumeminimuminfectionline.resistances,enhancedECCSpumpperformance,andnosinglefailure,resultinthehighestamountofflowdeliveredtotheRCS.WestinghouseECCSanalysescurrentlyperformedforsomeotherWestinghouseplantsassuneminimumsafeguardsbecausethatassumptionismorelimitingforthoseplantsthanthemaximumsafeguardsassumption.BasedonpreviousLOCAsensitivitystudies,thelimitinglargebreakwasfoundtobethedoubleendedcoldlegguillotine(DECLG).Therefore,onlytheDECLGbreakisconsideredinthelargebreakECCSperformanceanalysis.CalculationswereperformedforarangeofMoodybreakdischargecoefficients.CurrentLOCAanalysisfortheD.C.CookUnit1hasdenanstratedthatmaximumsafeguardsassumptionsresultinthehighestpeakcladtemperature.Therefore,theworstbreakforD.C.Cook(CD-0.6)wasre-analyzed,assumingmaximumsafeguards.TheresultsoftheanalysespresentedinAttachmentDshowthat1)themaximumcladtemperaturecalculatedforalargebreakis2163F,2)themaximumlocalmetal-waterreactionis9.65percent,and3)thetotalcoremetal-waterreactionislessthan0.3percent.Thecladtemperaturetransientisterminatedatatimewhenthecoregeometryisstillamenabletocooling.Asaresult,thecoretemperaturewillcontinuetodropandtheabilitytoremovedecayheatgeneratedinthefuelforanextendedperiodoftimewillbeprovided.Thesecalculationswereperformedat102$oftheDesignThermalPowerof3411MWTandapeakingfactorof2.10.~~
Mr.HaroldR.DentonC-2AEP:NRC:0745MOnthebasisoftheaboveevaluations,wheretheonlydifferencesfrompreviouslyanalyzedresultsarethechangeinthepowerlevelfrom3250MWtto3411WtandanincreasedpeakingfactorFfrom1.97to2.10,whichisbaseduponachangeinthemethodsusedtoperformtheanalysis;andsincetheresultsofsuchanalysisarewithintheguidelinesspecifiedin10CFR50.46,weconcludethatthechangewillnotinvolveasignificanthazardsconsiderationsasdefinedby10CFR50.92.Alsosincetheaccidentsanalyzedwillnotresultinanincreaseintheradiologicalsourceterm,webelievethischangewillnothaveanadverseeffecttotheenvironment.