ML18040A140

Forwards Response to Request for Addl Info Related to Proposed Changes to Nine Mile Point Unit 1 Re pressure-temp Limits.Nonproprietary Version of Final Rept MPM-59401-NP Also Encl

ML18040A140
Person / Time
Site:	Nine Mile Point
Issue date:	12/20/1994
From:	SYLVIA B R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17059A579	List: ML17059A578 ML18040A140
References
NMP1L-0888, NMP1L-888, NUDOCS 9412290176
Download: ML18040A140 (51)

Text

nPRIGRITY1ACCELERATEDRIDSPROCISSliGREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9412290176DOC.DATE:94/12/20NOTARIZED:NOFACIL:50-220NineMilePointNuclearStation,Unit1,Ni'agaraPoweAUTH.NAMEAUTHORAFFILIATIONSYLVIA,B.R.NiagaraMohawkPowerCorp.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)DOCKETN05000220

SUBJECT:

ForwardsresponsetorequestforaddiinforelatedtoproposedchangestoNineMilePointUnit1repressure-templimits.NonproprietaryversionofFinalReptMPM-59401-NPenclalso.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTRJENCLQSIZE:cP5++3TITLE:ORSubmittal:GeneralDistributionNOTES'ECIPIENTIDCODE/NAMEPD1-1LABRINKMAN,D.INTERNAL:ACRSNRR/DRCH/HICBNRR/DSSA/SPLBNUDOCS-ABSTRACTEXTERNAL:NOACCOPIESRECIPIENTLTTRENCLIDCODE/NAME11PD1-1PD1166~CENTER~@111RR/DSSA/SCSB11NRR/DSSA/SRXB11OGC/HDS311NRCPDRCOPIESLTTRENCL1111111110NOTETOALL>>'RlDS"RECIPIENTS:PLEASEHELPUSTOREDUCEiVKSTE!CONTACT'I'HEDOCL'iIE4ICONTROLDESK.ROO!1!Pl-37(EXT.504.083)I0ELIS!INKTEYOI.'RiAi!L'ROX!DIS'I'RIDUTIONLIS'I'SI'ORDOCI.'zIEN'I'SYOI'ON"I'L'I'.D!TOTALNUMBEROFCOPIESREQUIRED:LTTR18ENCL17 C100.I NIAGARAMOHAWKPOWERCORPORATION/NINEMILEPOINT,PO.BOX63,LYCOMING,NY13093/TELEPHONE(315)349-2882"B.RaiphSylviaExecutiveVicePresidentNuclearDecember20,1994NMP1L0888U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,DC20555RE:NineMilePointUnit1DocketNo.50-220DPR-

Subject:

ProposedLicenseAmendment-NeivPressure-TemperatureLimitCurves,ResponsetoRequestforAddMonalinformationGentlemen:InalettertotheNuclearRegulatoryCommission(NRC)datedSeptember1,1994(NMP1L0858),NiagaraMohawkPowerCorporation(NMPC)proposedaTechnicalSpecificationamendmenttoSection3.2.2changingthepressure-temperaturelimitcurvesinFigures3.2.2.a,b,c,d,ande.DuringtheStaff'sreviewoftheproposedamendment,theydeterminedthatadditionalinformationisrequiredtocompletetheirreview.TheadditionalinformationwasspecifiedinaNovember21,1994lettertoNMPCandclarifiedinatelephoneconferenceonDecember1,1994.QnDecember5,1994,NMPCsubmittedtotheNRCaproprietarycopyofthe"PlantSpecificCharpyShiftModelforNineMilePointUnit1."ThislettercontainsadditionalinformationrequestedinNRC'sNovember21,1994letter.Attachedtothisletterare:1)ResponsetoNRCAdditionalInformationRequestRelatedtoProposedChangestoNineMilePointUnit1(NMP-1)Pressure-TemperatureLimits;2)anon-proprietaryversionofthe"PlantSpecificCharpyShiftModelforNineMilePointUnit1";and3)awaiverofCopyrightRestrictionsforthenon-proprietaryreport.NMPChasprovidedacopythisresponsetotheappropriatestaterepresentative.Verytrulyyours,B.RalphSylviaExecutiveVicePresident-NuclearBRS/RLM/lmcAttachments9412290176941220PDRADGCK05000220PPDR J

Page2xc:RegionalAdministrator,RegionIMr.L.B.Marsh,Director,ProjectDirectorateI-l,NRRMr.D.S.Brinkman,SeniorProjectManager,NRRMr.B.S.Norris,SeniorResidentInspectorMs.DonnaRossDivisionofPolicyAnalysisandPlanningNewYorkStateEnergyOfficeAgencyBuilding2EmpireStatePlazaAlbany,NY12223RecordsManagement Attachment1'ResponsetoNRCAdditionalInformationRequestRelatedtoProposedChangestoNineMilePointVnit1(MUG-1)Pressure-TemperatureLimitsInformationRequestA-"Forthesurveillanceplatematerial,Criteria1ofRG1.99,Rev.2wasnotmetbecausethelimitingmaterial(upperplateG-307-4)isnotthesurveillancematerial.Criteria3wasnotmetbecausethemethoddescribedinRegulatoryPosition2.1wasnotusedtoobtainthebest-fitlineoftheplant-specificdata.Verifyandprovidethebasisfordeterminingthatthesurveillancedataarecredible."NMPCResponse-Priortothedevelopmentoftheplant-specificCharpyshiftmodel,NMPCtookstepstobringtheNMP-1surveillanceprogramintoconformancewiththecurrentversionofASTME185andwithSectionIIIoftheASMEcode.TheprogrammodificationswerefullydescribedinReference[Ma92]alongwithadiscussionofhowtheupgradedsurveillanceprogramdatasatisfiesthefivecriteriaofRegulatoryGuide1.99(Rev.2)(RG1.99(2)).WithregardtoCriterion1,itwaspointedoutin[Ma92]thattheCuandNicontentofthesurveillanceplatematerialscloselymatchestheplateG-307-4chemistryandasmallchemistryadjustmentfactor,basedontheRG1.99(2)model,wasusedinthepasttorepresenttheG-307-4behavior.However,asaresultofthedevelopmentoftheplant-specificmodel,itwasobservedthatCudoesnotplayasignificantroleatfastfluencesbelow-2xl0"n/cm.Therefore,thereisnoneedforachemistryadjustmentandtheNMP-1surveillancedataarecredibleintermsoftheirrepresentationoftheG-307-4behaviorunderirradiation.WithregardtoCriterion3,theRG1.99(2)modelwasusedinthepasttodemonstratethecredibilityoftheNMP-1surveillancedataintermsofitsscatteraboutthemean.AdiscussionofthisanalysisusingtheRG1.99(2)modelwasprovidedinReference[Ma92].AsshowninFigure4-14ofReference[Ma94],theNMP-1datafallwithinthescatteroftheplant-specificdata.Therefore,theNMP-1surveillancedataarecrediblewithregardtoRG1.99(2)Criterion3undertheplant-specificanalysisaswell.InformationRequestB-"Forequation(2-2)onPage5ofthesubmittal(calculationofd,RT~Tforthebeltlineplatematerial);(1)Identifyallrawdatausedtoarriveatthisequation."Page1'4122901-76:NMPCResponse-TheNRC'sPowerReactorEmbrittlementDatabase(PR-EDB)wasthesourceofalldatausedtoobtainequation(2-2)onPage5ofthesubmittal.ThedatausedintheregressionanalysisarelistedinTable4-1ofReference[Ma94].

InformationRequestC-"Figure2-1onPage11ofthesubmittalcomparestheRG1.99,Rev.2modelwiththeplantspecificAT~model.Foreachdatapoint:(1)Providethecopperandnickelcontent,(2)Identifytheplantfromwhicheachdatapointwasobtained,and(3)Identifywhichdatawerenotusedindevelopmentofthecurve."NMPCResponse-TheCuandNicontentofthedataplottedinFigure2-1onPagellofthesubmittalisgiveninTable1.TheCucontentofthedatainTable1wasplottedversusthesquarerootoffluenceinFigures4-10through4-12ofReference[Ma94].TheseplotsdemonstratethelackofCudependenceatfluencesbelow-2x10"n/cm'.Thedatausedintheregressionmodelincludedfluencesupto4xl0"n/cm.ThesedataareindicatedinTable1.InformationRequestD-"Providethebasisanddatausedtoconcludethat"...mostBWRsoperateatfluencesbelowthefluencethresholdforsignificantCuprecipitation."(Page3ofsubmittal)"NMPCResponse-SinceradiationdamageinRPVsteelscausesanincreaseinyieldandultimatetensilestress,tensiledataanalysisisaneffectivemeansforstudyingthemicrostructuralevolutionunderirradiation.Irradiationproducesbothshearable(Mn/Cu/NiandpossiblySirichclusters,depletedzones,andvacancyloops)andnon-shearable(MAC)hardeningdefects,anditisimportanttoresolvewhethertheshearableornon-shearablecontributionisgreaterinordertobeabletoadequatelymodeltheeffectonfracturebehavior.Forthispurpose,astudyoftensiledatatrends,originallyreportedinReference[Ma92b]andlaterexpandedin[Ma94b]and[Ma94c],isparticularlyrelevant.Figure1showsthatelevationoftheyieldstrengthoccursforCulevelsabove-0.1weightpercent.ThisisconsistentwiththeTransmissionElectronMicroscopy(TEM),AtomProbe-FieldIonMicroscopy(APFIM),andSmallAngleNeutronScattering(SANS)datareportedinReference[Au94].ThechangeinyieldstrengthasafunctionoffluenceandCucontentisshowninFigures2through5.AsshowninFigure3,forfluences(1x10"n/cm~,thereisnosignificantdependenceofCulevelontheyieldstrengthelevation.Figure6showstheET,QandAUSEcorrelationwithelevationofyieldstrength(hn).ThecorrelationofhowithbT,Qisareflectionoftheneutroninducedformationoffinescaledislocationobstacleswhichincreasetheflowstressandproducemoreintenselocalizedplasticzonesatelevatedtemperature.Thiscorrelationisphysicallymeaningful.However,thecorrelationofUSEwithb,oisanindirectcorrelation.ThedropinUSEisnotdirectlyrelatedwithhardening.Rather,flowlocalizationduetotheintroductionofshearabledefectsisthemostplausibleexplanationfortheshelfdrop[Ma94b].ThefactthatthedUSEcorrelateswithhoismerelyareflectionthatd,oisproportionaltothenumberdensityofshearabledefects.Figures7through9arethetrendsforstrainhardening.Figure7showsthattheyieldstressandtheultimatestressareelevatedbyapproximatelythesameamount.Thereisasmalltrendfortheirradiatedyieldstresstoincreasemorethantheirradiatedultimatestress.Page2

TheuniformstraintrendisshowninFigure8.Overall,thechangeinuniformstrainafterirradiationissmallandthereisatrendtowarddecreaseinductilityafterirradiation.AsshowninFigure9,theredoesnotappeartobeasignificantchangeinthestrainhardening.ThedatainFigure9wereobtainedbyidealizingtheflowcurveasabilinearapproximation.Thenegligiblechangeinstrainhardeningsuggeststhattheprimaryhardeningdefectsareshearable(e,g.,vacancyloops,soluteclusters).Non-shearableparticle(e.g.,Mo,C)distributionsareapparentlynotsignificantlychangedortheparticlesformedduringirradiationarenotsufficientlylargetocausedislocationlooping.Inadditiontothetensiledatatrends,furtherevidenceofalackofCudependenceatfluencesbelow-2x10"n/cmisshowninFigures10-12.ThereisnoapparenttrendinCharpyshiftwithfastfluenceinthesefigures.Finally,APFIMstudies[Au94,Mi88,Mi88b]haveshowndefinitivelythattheconceptofapurecopperprecipitatesinRPVsteelsisincorrect.Thesestudieshaveshownthatclusters,or"clouds",ofelementslikeNi,Mn,Si,andCuactuallyform.IthasbeenshownthatCuonlyplaysaminorrole.InReference[Au94],itwasconcludedthatclusteringoccurredinthefirststageofformationatafluenceof4.6x10"n/cm.Therefore,basedonAPFIMresults,futuregenerictrendcurvesshouldconsidertheeffectofotherelementssuchasSi,Mn,andP,andshouldaccountforanincubationdoseforsignificantclusteringeffectsonmechanicalbehavior.Intheabsenceofphysicallycorrectgenerictrendcurves,anaccurateapproachistodevelopaplant-specifictrendcurveasdescribedin[Ma94].InformationRequestE-"Providethebasisforusingamarginof17'Fasopposedto34'FasspecifiedinRG1.99inthecalculationoftheadjustedreferencetemperatureforthebeltlineplates."NMPCResponse-TheRG1.99(2)0;termforplateswastakentobe0becausetheinitialRT>>~wasdeterminedbasedonmeasureddataasdescribedinReference[Ma92].The0~termprescribedinRG1.99(2)addsconservatismtotheART>>TtoaccountforuncertaintyintheCharpyshiftregressionmodel.Thisuncertaintycomesfromtestmethodvariationandfromvariationinthefracturebehaviorofthematerial.Therefore,sincethe0~termof17'Fforthebasemetalwasdeterminedusingalargedatapopulation,thisvaluewasusedinthecalculationoftheRG1.99(2)margintermsinceitisexpectedtorepresentCharpydatascatterbetterthanthatobtainedfromasmalldatapopulation.UnderSection2.1ofRG1.99(2),the0~termmaybecutinhalfforplantswhichhave2ormorecredibledatasets,Sincetheplant-specificmodeldevelopedisconsistentwiththeintentofSection2.1ofRG1.99(2),theRG1.99(2)0~termwashalved.InformationRequestF-"Provideapplicableinformation,withrespecttoquestions1-6above,regardingthebeltlinewelds."NMPCResponse-ThisrequestwasdeletedduringatelephoneconferencewiththeNRConDecember1,1994.Page3

InformationRequestedDuringTelephoneConferenceonDecember1,1994TheNRCrequestedthefollowinginformation:~0,and0~usedfortheweldmargintermcalculation.~Standarddeviationfortheplant-specificplatemodel.NMPCResponse-AsdiscussedinReference[Ma92],o,forweldswastakentobe17'Fand0~wasone-halfofthehRTN~.InresponsetotheNRCrequest,thestandarddeviation(0)fortheplant-specificplatemodelwascalculatedandfoundtobe32'F.Themeanregressionlineand20confidencelimitsareshowninFigure13.ItisNMPC'spositionthatthemostappropriate0~isthat'fRG1.99(2)(17'F)becauseitwascalculatedbasedonalargedatapopulationandmoreaccuratelyreflectstheuncertaintyinCharpyshift(ET30)measurementandmaterialvariation.FurtherjustificationforuseoftheRG1.99(2)0~termisprovidedbyconsideringthevariationintheNMP-1surveillancedata.TheaverageforthethreeNMP-1ET,osis48.5'F.ThedifferencebetweenthisaverageandthepeakET,Ois30.8'F.ThedifferencebetweentheaverageandthelowestET,Ois37.3'F.Thesedata,alongwiththedatapresentedinTable1,demonstratethelackofdependenceonCuinthelowfluencerangeandalsosuggestthattheRG1.99(2)20limit(34'F)reasonablyrepresentstheuncertaintyfortheNMP-1beltlineplates.Page4

Table1CuandNiContentofDataPlottedinFigure2-1oftheSubmittalPlantIDBigRockPointBigRockPointBigRockPointHaddamNeckHaddamNeckHaddamNeckGariglianoGariglianoGariglianoGariglianoOysterCreekPointBeach1PointBeach1PointBeach1PointBeach1SanOnofie1SanOnofie1MaterialA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BA302BCQ(vvt.%)0.100.100.120.120.230.230.230.230.230.170.200.200.200.200.180.18Ni(ivt.%)0.180.110.060.060.060.06CharpyShifthT~(ft.-lbs.)15153585.80106167115126151729010090105130100SquareRootofBestEstimateFluencex10'nlcm')12.0012.0012.0014.3914.3920.1027.1568.1947.0133.1773.9622.8948.6848.5858.9941.83UsedinRegressionModelyesnononononononononono

Table1CuandNiContentofDataPlottemFigure2-1oftheSubmittal(Cont'd)PlantIDSanOnofre1SanOnofre1SanOnofre1MaterialA302BA302BCu(wt.%)0.180.180.18Ni(wt.%)CharpyShifthT~(ft.-lbs.)110120SquareRootofBestEstimateHuencex10'n/em)41.8358.9962.05UsedinRegressionModelnononoIndianPoint3IndianPoint3IndianPoint3IndianPoint3IndianPoint3IndianPoint3IndianPoint3Millstone1NineMilePoint1NineMilePoint1NineMilePoint1PalisadesPalisadesA302MA302MA302MA302MA302MA302MA302MA302MA302MA302MA302M0.190.240.240.180.240.240.&0.210.180.230.230.240.240.490.520.520.500.520.520.520.590.560.510.510.530.531501371508911815517058795520517532.2517.6626.9117.6617.6632.2532.255.706.916.916.0067.0833.17nononononono

Table1CuandNiContentofDataPlotteinFigure2-1oftheSubmittal(Cont'd)PlantIDPalisadesPalisadesPeachBottom2PeachBottom3MaterialA302MA302MCQ(wt.%)0.&0.&0.100.13Ni(wt.%)0.530.530.540.62CharpyShifthT3,(ft:lbs.)1553016SquareRootofBestEstimateFluencex10'n/cm)66.3333.624.964.03UsedinRegressionModelnonoBeaverValley1BeaverValley1BeaverValley1BeaverValley1BeaverValley1BeaverValley1CalvertCliffs1CalvertCliffs2DonaldC.Cook1DonaldC.Cook1DonaldC.Cook1CooperCrystalRiver3A533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533B0.200.200.200.200.200.200.180.180.140.140.160.220.200.540.540.540.540.540.540.650.650.490.490.650.760.54130150185120135881287060607412816.7630.2230.2216.7625.5725.57&.2928.5316.4016.4016AO32.86nonononononono

Table1CuandNiContentofDataPlottedinFigure2-1oftheSubmittal(Cont'd)PlantIDCrystalRiver3CrystalRiver3CrystalRiver3CrystalRiver3DuaneArnold1JosephM.Farley2JosephM.Farley2JosephM.Farley2JosephM.Farley2JosephM.Farley2JosephM.Farley2FortCalhoun1JamesA.FitzpatrickEdwinLHatch1Millstone2MaineYankeeMaineYankeePilgrimUnit1MaterialA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BCu(ivt.%)0.200.200.200.200.150.200.200.200.200.200.200.180.120.120.180.180.180.13Ni(ivt.%)0.540.540.540.540.670.600.600.600.600.600.600.650.630.670.650.650.650.63CharpyShifthT3o(ft;lbs.)21126971274218016516513310319058141150160SquareRootofBestEstimateFluencer10'n/cm')10.2525.6127.3925.618.8354.9640.8740.8724.7424.7454.9621.916.486.1629.7336.0635.364.79UsedinRegressionModelnononononononononononononoycs

TableICuandNiContentofDataPlottedinFigure2-1oftheSubmittal(Cont'd)PlantIDSalemUnit1SalemUnit1SalemUnit1SalemUnitISalemUnitISalemUnit1SalemUnit1St.Lucie1St.Lucie2St.Lucie2VermontYankeeZion1Zion1Zion1Zion2Zion2Zion2MaterialA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BA533BCu(>vt.%)0.220.240.220.240.240.240.220.180.100.100.100.120.120.160.120.120.16Ni(svt.%)0.510.520.510.530.530.520.510.650.570.570.660.490.490.650.510.510.65CharpyShifthT~o(ft;Ibs.)110100125100170165751103521196066384950SquareRootofBestEstimateFluencex10'n/cm')35.0716.0030.5016.0030.5030.5016.0026.7612.6512.652.0718.0318.0318.0316.7916.7916.79UsedinRegressionModelnonoyesnononoyesyes

150zI-(9ZliJKI-co0llJ0-OUJ<COCCKD10050n000.000.060.120.180.240.30WEIGHT,PERCENTCOPPER>A533B0,A302M~A302B150zI-C9ZIIJKI-NOIJJOUJOKK10050CIn:Q00O6<+ISdk::r'00.000.060.120.180240.30WEIGHTPERCENTCOPPER>A533B0A302MA302BFigure1Unirradiated(Top)andIrradiated(Bottom)YieMStrengthvs.WeightPercentCopper 0

50co4pZ(930COo201P(9Z0-1000"""-";"",".~"""o"~~"84y~>b,:'0~a0ohpp0~~<A533B0A302M~A302B0.000.060.120.180.240.30WEIGHTPERCENTCOPPERFigure2YieldStrengthIncreaseasaFunctionofCuContent(AllFluences)

504030CI3o2010C9o-10600QpbbsBp!ppphPAl>A53380A302M~A3028'0.000.060.120.180.240.30WEIGHTPERCENTCOPPERFigure3YieldStrengthIncreaseasaFunctionofCuContent(ForFluencesc1x10isn/cd)

5040z30COa2010C9Z0-10h~p~u80>A533B0A302M~A302B0.000.060.120.180.240.30WEIGHTPERCENTCOPPERFigure4YieldStrengthIncreaseasaFunctionofCuContent(ForFluencesintheRangeIxlp"n/cm'ft4Ix1p"g/cm')

5040zI-C930COo20z10(9z0-10oq>A533B0A302M~A302B0.00.0.060.120.180.240.30WEIGHTPERCENTCOPPERFigure5YieldStrengthIncreaseasaFunctionofCuContent(ForFluences>~Ix10"n/cm')

0 300Q)CUhClEQ>I-COCOCCOI-A5IvOC9CLO2001000'W:dv.'@:o:~Vw%a..zwi~'IV..O.....:...Q.............'........."100-100102030405060IrradiationIndUcedChangeinYieldStrengtha)vA53380A302M~A30281.0UJCOzUJCOKODZ00Q.0.80.60.4020.095%CONFIDENCEIUMITg~w~~~~~~~(~~~:ODETTEb)0,100200INCREASEINYIELDSTRENGTH(MPa)Figure6CorrelationofYieldStrengthElevationWitha)CharpyShiftandb)FractionalDecreaseinVSE

COCOLUCCI-COOillCOZ'UI-OIJJOCCCCZ5040302010001020304050<A533B0A302M~A302BIRRADIATEDULTIMATEMINUSYIELDSTRESSFigure7PlotoftheUltimateandYieldStrengthDifferenceBeforeandAfter~Irradiation

5040o30~~201000g)p~ppCL10203040GGVJ3IATEDUNIFORMSTRAIN(%)50<A53380A302M~A3028Figure8PlotofthePercentUniformStrainBeforeandAfterIrradiation t

300200CCDO0100~rbo"0""""""""jgaj:r4'bbbr00100200300:TYPICAL:MEASUREMENT:UNCERTAINTY.'RANGE4A533B0A302M~A302BIRIVJ3IATEDFLOWCURVESLOPEVTS-XZFlowQuveSlope=eFigure9PlotofAverageFlowCurveSlopeBeforeandAfterIrradiationShowingNegligibleStrainHardeningChange

UCO0)D.EI-C003c6l-IOCO3002001000028~Qt!5.~-~--~-~o~...~...............Q18.81KQl,Q105~Q18.tQlQl~.....Ql.~Q18~~Q18~Q18~~~~02$-100020406080100SquareRootofFastFluence(n/em**2)/30**8Figure10A302BPlant-SpeciTicDataSetShowingLackofDependenceofCharpyShiftonCuContentintheLowFluenceRange.(CuContentinWeight%ShownNexttoEachDatum)

300CDCD~D.ECDI-0COC6l-ILLOC92001000024.024,Sf02<.SP.023.0.1r.018.$133~~~~~~~~~~~~~~S~~~~~~~~~~~~~~'l~~~~~~~~~-100020406080100SquareRootofFastFluence(n/cm'*2)/10**8Figure11A302MPlant-SpeciTicDataSetShowingLackofDependenceofCharpyShiftonCuContentintheLowFluenceRange.(CuContentinWeight%ShownNexttoEachDatum)

300CO(D(5200(DaE(DI-CO100C(5I-JDILL0OC90O-100020406080100SquareRootofFastFluence(n/cm*'2)/10'*8NOTE:CircleDiametersIndicateRelativeBulkCopperContentFigure12A533BPlant-SpecificDataSetShowingLackofDependenceofCharpyShiftonCuContentintheLowFluenceRange.(CuContentShownasRelativeCircleDiameter.LargerDiameterIndicatesHigherCuContent)

300ZI0)e200O.EI-C::100IIL0OC9o-~000vOdPv'pmtvyvV..../.....v..i.gv.........r.i.0'0ViV:vv2040vv6080100lower2crupper2ameanvA533B0A302M~A302BSquareRootofFastFluence(nr'cm'*2)/10'+8Bgure13Plant-SpeciTicCharpyShiftModelWith2eConfidenceLimits 0-References[Au94]P.Auger,P.Pareige,M.Akamatsu,J-C.VanDuysen,"MicrostructuralCharacterizationofAtomClustersinIrradiatedPressureVesselSteelsandModelAlloys",tobepublishedintheJournalofNuclearMaterials.[Ma92]M.P.Manahan,Y.Soong,"ResponsetoNRCGenericLetter92-01forNineMilePointUnit1",ReportNo.MPM-GL-692713,NMPCProject03-9425,June12,1992.[Ma92b]M.P.Manahan,"UpperShelfEnergyDropTrendCurveModelling",FinalReporttoNiagaraMohawkPowerCorporation,NMPCProjectNo.03-9425,ReportNumber1292315,November30,1992.[Ma94]M.P.Manahan,"Plant-SpecificCharpyShiftModelforNineMilePointUnit1",FinalReporttoNiagaraMohawkPowerCorporation,ReportNumberMPM-59401,May,1994.[Ma94b]M.P.Manahan,LJ.Cuddy,andA.J.Peterson,"APlant-SpecificUpperShelfEnergyDropMethodology",ReactorDosimetry,ASTMSTP1228,HarryFarrarIV,E.ParvinLippincott,JohnG.Williams,andDavidW.Vehar,Eds.,AmericanSocietyforTestingandMaterials,1994.[Ma94c][Mi88]M.P.Manahan,"ThePhysicalBasisforUpperShelfEnergyDropinIrradiatedNuclearReactorPressureVesselSteels",FinalReporttoEmpireStateElectricEnergyResearchCorporation(ESEERCO),ResearchReportNumberEP89-21,May,1994.C:M.K.MillerandM.G.Burke,"MicrostructuralCharacterizationofIrradiatedPWRSteelsUsingtheAtomProbeField-IonMicroscope",EnvironmentalDegradationofMaterialsinNuclearPowerSystems-WaterReactors,G.JTheusandJ.R.Weeks,Eds.,TheMetallurgicalSociety,1988.[Mi88b]M.K.Miller,D.T.Hoelzer,F.Ebrahimi,J.R.Hawthorne,andM.G.Burke,"MicrostructuralCharacterizationofIrradiatedFe-Cu-Ni-PModelSteels",EnvironmentalDegradationofMaterialsinNuclearPowerSystems-WaterReactors,G.J.TheusandJ.R.Weeks,Eds.,TheMetallurgicalSociety,1988.