ML18038A714

Final Rept Entitled, Elastic-Plastic Fracture Mechanics Assessment of Nine Mile Point Unit 1 Beltline Plates for Service Level a & B Loadings.

ML18038A714
Person / Time
Site:	Nine Mile Point
Issue date:	10/16/1992
From:	NIAGARA MOHAWK POWER CORP.
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ML17056C080	List: ML17056C079 ML18038A714
References
MPM-USE-109213, NUDOCS 9210220185
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~<<a)i~~WI,NMPCProject03-9425MPM-USE-109213FINA>>LREPORTentitledELASTIC-PLASTICFRACTUREMECHANICSASSESSMENTOFNINEMILEPOINTUNIT1BELTLINEPLATESFORSERVICELEVELAANDBLOADINGS<<<<>."<<<<>>>'>>><<<<<<<'>>><<<<'<<><<>y>><<>>>>>>><<><<><<'4'<<>><<>"<<>>'v<<~<<k><<>r<<lV<<<</0>>v<<>>~'>A',>>>>>4>>>>)<<<<><<>><pic>~<<>>Ag)><<>>>><<>>><<>>'>>><<>>><<<<0><<>>>'>><<<<j*>><<g>>>g<<>>3<<>>>>><<g<<>>>>>,)>>>~p.>>>><<>>>>>>><<,'>>p'>>>>>>>e>>*>>x<<<<>>><<>><<<<>>>>>>>v>>>>>>><<P<<fvOctober16,19929210220i8592ioi6PDRADOCK.0500022itPPDR II4J TableofContents1.0NMP-1LowUseIssue1.1WeldMetalScreeningCriterionCalculations.1.2BaseMetalScreeningCriterionCalculations...1.3Summary...44672.0ApproachtoResolution~~~~~~~~~~~~123.0AnalyticalModelforServiceLevelAandBAnalysis134.014141415151617184.34.41919~~~~~~~~~~~~~~~~~~2020MaterialModels4.1TechnicalBasisforUseofA302BJ-RCurveModel.............4.1.1MaterialCompositionAnalysis4.1.2A302BDuctileFractureBehavior..~.4.2A302BJ-RCurveModel.~.421J~cUSECorrelation4.2.2J-RCurveDetermination...A533BJ-RCurveModel...~.........MaterialParametersforElastic-PlasticFractureMechanicsAnalysis4.4.1Young'sModulus...4.4.2Poisson'sRatio.....4.4.3YieldStress5.05.3Elastic-PlasticFractureMechanicsAssessment..5.1ModelDescription..5.2CalculationsforA302BMaterialModel5.2.1PlateG 1Analysis5.2.2PlateG-307-4Analysis........CalculationsforA533BMaterialModel5.3.1PlateG 1Analysis........5.3.2PlateG-307-4Analysis5.4SummaryofConditionsAnalyzed..4444444444454545456.0SummaryandConclusions.................717.0References74 l)N~l 1.0NMP-1LowUseIssueTestingandevaluationmustbeconductedtoensurethatnuclearreactorpressurevesselsaresafeintermsofbothbrittleandductilefractureundernormaloperationandduringdesignbasistransients.Withregardtoductilefractureprotection,AppendixGto10CFR50prescribesascreeningcriterionof50ft-lbs.IfanybeltlinematerialsareexpectedtoexhibitCharpyUpperShelfEnergy(USE)(T-Lorientation)below50ft-lbs,thenadditionalanalysesmustbeperformedtoensurecontinuedsafeoperation.TheDraftASMEAppendixX[ASME92]wasdevelopedtoassistlicenseesinperformingelastic-plasticfracturemechanicsevaluationsforbeltlinematerialswithlowuppershelfenergies.ThisreportdocumentsapplicationofthedraftAppendixXcalculativeprocedurestotwoNineMilePointUnit1(NMP-1)beltlineplates.TheNMP-1beltlinematerialswereevaluatedtodeterminewhetheranymaterialswouldexceedthe50ft-lbscreeningcriterion.TheresultsoftheseevaluationsareshowninTables1-1and1-2,andwerepresentedintheresponsetoNRCGenericLetter92-01[MA92].WiththeexceptionofplateG 3,onlyL-TCharpydataareavailableforthebeltlineplates.Therefore,itisnecessarytoapplyanL-TtoT-LconversionfactortoobtainT-Lorientationpropertiesfortheplates.Sincetheweldmetalisessentiallyisotropic,orientationconsiderationsarenotimportantforthebeltlinewelds.ThedatainTable1-1weredevelopedusingtheRegulatoryGuide1.99(Revision2)[RG1.99](RG1.99(2))genericmodel.ThedatainTable1-2weredevelopedusingtheRG1.99(2)procedurewithplant-specificdata.AsshowninTable1-2,theplant-specificmodelshowsthatnoneofthebeltlinematerialsareexpectedtofallbelow50ft-lbspriortoend-of-license(EOL).ItisNiagaraMohawkPowerCorporation's(NMPC's)positionthattheplant-specificmodelisappropriate.However,sincetwoofthebeltlineplatesareexpectedtoapproachthescreeningcriterion,NMPChascommittedtoperformanelastic-plasticfracturemechanicsassessment.FurtherdetailsconcerningthescreeningcriterioncalculationsareprovidedinSubsections1.1and1.2below.1.1WeldMetalScreeningCriterionCalculationsFullCharpycurvesfortheNMP-1beltlineweldswerenotmeasuredatthetimewhenthevesselwasfabricated.However,Charpydataat10'FweremeasuredbyCombustionEngineeringandthesedataaresummarizedinReferences[MA90]and[MA91].Aninnovativemethodology[MA85]wasdevelopedtodeterminetheinitialRT~~forcaseswherethedatarequiredbytheASMECodearenotavailable.ThisapproachwasappliedtotheNMP-1beltlinematerialsandtheresultsaredescribedinReference[MA90].ThemethodologyforRT~rdeterminationincludesestimationoftheunirradiatedUSEincaseswherefullCharpycurvesarenotavailable.WeldW5214/5G13Fisthesurveillancecapsuleweld.Thisweldwasnotmadeusingthesamewireheatorfluxlotasthebeltlinewelds.However,theweldmaterialsweremanufacturedbythesamesuppliers,theweldwiretypeandfluxtypearethesame l4tI&h4jc (RACO03wire,ArcosB5flux),thesameprocedurewasused,andtheCuandNicontentisrepresentativeofthebeltlineweld1248/4M2F[CE90,MA91].Ithasbeenassumedthatthecapsuleweldmaterialissimilartothebeltlineweldsintermsofitsmechanicalbehaviorresponse.TheirradiatedCharpydataforthecapsuleweldmaterialwasanalyzedusingtheSAMMcFRACcode[McFRAC].Thiscodeisbasedonanon-linear,leastsquares,regressionanalysisusingtheWeibullstatistic.TheWeibullstatistichasbeenshowntobethecorrectstatisticforanalysisoffracturedatabyconsideringthemicrostructuralmechanismsinvolvedinthefractureofferritic,pressurevesselsteels[MA85a].Theconfidencebandsaremeasuresof'thegoodnessoffit'nddonotindicatetheengineering95%statisticalerrorspread.Thisuncertaintymustbeanalyzedusingconventionalstatisticalmethods.However,theMcFRACconfidenceintervalsareusedtomeasureconfidenceinthefitofaparticulardatasetaswellastheinherentscatterduetothefractureprocess.Theseerrorbandsmustbecalculated,particularlyforsparsedatasets,becauseinmanycasestheabilitytofitsparsedatadrivestheuncertainty.TheMcFRACanalysisfortheirradiatedcapsuleweldisshowninFigure1-1.TheprocedureusedtocalculatetheRT~oftheNMP-1beltlineweldsrequiresestimationoftheunirradiatedUSE.Odette'syieldstrengthmodel[OD86]wasusedtoestimatethesurveillanceweldunirradiatedUSEusingtheirradiatedUSEasinput.Inparticular,USE'USEwhere,f=fractionalchangeinUSEf=9.0x10do+0.02(ha-40)',a=changeinyieldstrengthduetoirradiationUSE'unirradiatedUSEUSE=irradiatedUSETheirradiatedUSEwasmeasuredat7.98EFPYandfoundtobe110ft-lbs.UsingOdette'smodelandthemeasuredyieldstrengthchange,theunirradiatedUSEforthesurveillanceweldisestimatedtobe128ft-lbs.AnotherimportantaspectoftheRT~revaluation,whichwasusedinthebeltlineweldUSEevaluation,istheestimationofthe95%confidenceintervalforenergymeasurement(2@a)atthe50ft-lblevel.The2'orthesurveillanceweldatthe50ft-lblevelwasestimatedat13.5ft-lbs.Thisestimateisconsistentwiththeuncertaintyindetermination

~~~<;sM~1I4A1IJ oftheUSEfortestsconductedontheuppershelf.TheminimumunirradiatedUSEdataforthebeltlineweldsshowninTable1-1wasdeterminedassumingthattheCharpybehaviorofthesurveillanceweldissimilartotheresponseforthebeltlinewelds.Toensureconservatism,themeasuredirradiatedUSEwasusedasanestimateoftheunirradiatedUSE.ThemeasuredirradiatedUSEforthesurveillanceweld(110ft-lbs)wasthenreducedby2cra(13.5ft-lbs)plusanadditional6.5ft-lbforconservatism.Thislowerboundestimateof90ft-lbswasconservativelyassumedtorepresenttheunirradiatedUSEofthebeltlinewelds.InresponsetotheNRC'srequest,additionalanalysesarebeingperformedtomoreaccuratelycharacterizetheuncertaintyintheRTNDTandUSEestimationprocedure,andtheresultsoftheseanalyseswillbereportedtotheNRCinthenearfutureunderseparatecover.1.2BaseMetalScreeningCriterionCalculationsInordertoidentifythebeltlineplateswhichmaypotentiallyfallbelowthe50ft-lb~screeningcriterion,theguidanceinparagraphC.1.2ofRG1.99(2)wasfollowed.SinceonlyL-Torientationdataareavailableformostofthebeltlinematerials,theReference[MTEB81]guidancewasusedtoconvertfromtheL-TtoT-Lorientation.Inparticular,theL-Tvaluesweremultipliedby0.65toobtaintheT-Lorientationestimates.AsshowninTable1-1,basedontheseconservativemodels,platesG-307-4andG 1wereidentifiedasthebeltlinematerialswhichmayexceedthescreeningcriterion.PlateG-307-4isalsothecriticalplatematerialfromanARTNDTperspective.BasedontheresultsoftheRG1.99(2)genericmodelanalysis,furthercalculationswereperformedforplatesG 1andG-307-4onaplant-specificbasis,ExaminationoftheirradiateduppershelfdatapresentedinReference[MA91]suggeststhattheshelfdropisnegligible.However,thisconclusionistentativeforplateG 3sincetherearenotsufficientUSEdataavailableforstatisticalanalysis.CapsuleBisscheduledforwithdrawalduringthe1996outage.ThiscapsulecanprovidethedataneededforverificationofasmalluppershelfenergydecreaseforboththeG 1andG 3materials,InthecaseofplateG 1,therearethreeirradiatedandthreeunirradiatedUSEpointsavailableforanalysis.ThesedataaresummarizedinTable1-3.ComparisonofthelinearaveragessuggeststhattheAUSEissosmallthatitiswithinthemeasurementuncertainty.Ifthe8USEisconservativelycalculatedusingthemeanoftheunirradiateddataandthelowestirradiateddatapoint,thebUSEis10%.Similarly,ifthebUSEiscalculatedusingthelowestirradiatedandunirradiatedpoints,theb,USEis5%.TheG 1Cucontent(0.23Wt.%)isclosetotheG-307-4Cucontent(0.27Wt.%),Therefore,achemistrycorrectionwasnotapplied.TheReference[MTEB81]L-TtoT-Lconversionfactorof0.65appearstobeoverlyconservativefortheNMP-1beltlineplates.Inparticular,themeasuredL-TtoT-Lconversionis0.82[MA91].Applyingthesematerial-specificfactors,thebestestimateUSEdataforplatesG 1andG-307-4aregiveninTable1-2.

~i~ly1Iy~C.

ThehUSEestimatesinTable1-2wereobtainedusingtheguidanceofparagraph2.2ofRegulatoryGuide1.99(Rev.2)withanITtoT-Lconversionfactorof.8andanassumedDUSEof10%at7.98EFPY.TheL-TtoT-Lconversionfactorof0.8wasobtainedusingtheplateG 3lowestmeasuredUSEdatameasuredinboththeL-TandT-Lorientations.Basedonthisanalysis,itispredictedthatthecriticalplateUSEwillnotfallbelow50ft-lbpriortoEOL.Itisrecognizedthatadditionaldataandanalyseswillbeneededtoconfirmtheplant-specificcalculations.Theon-goingNMPCworktodevelopmaterial-specificmodelsisdescribedinSection2.0.1.3SummaryInsummary,NMPCbelievesthatthemodelsusedtocalculatetheTable1-1dataareoverlyconservativefortheNMP-1beltlinematerialsandtheplant-specificanalysisisrepresentativeoftheactualplatematerialcondition.MicrostructuraldataobtainedtodateindicatesalargepopulationofMnSinclusions,MO,Cprecipitates,andFe,Cprecipitatesintheunirradiatedplate[FR92].Theseprecipitatesandinclusionshavebeenshowntobestableunderirradiation.Ithasbeenproposed[MA91b]thattheloweringoftheuppershelfduetoneutrondamageinsteelswithinitiallyhighconcentrationsofparticlesisexpectedtobenegligiblesincetheirradiationinduceddefects(Curichprecipitates,microvoids)willnotsignificantlyinfluencethefractureprocessontheuppershelf.Asdiscussedearlier,theReference[MA91]datasupportthisproposition.Accordingly,itisinappropriatetoapplygenericcorrelations,developedusingdataforlowsulfursteels(A533B),topredicttheAUSEfortheNMP-1platematerials.Therefore,asdescribedinSection2.0,NMPCisdevelopingmaterial-specificmodels,whichaccuratelymodelthephysicsofductilefracture,whichwillyieldaccurateandconservativepredictionsoftheeffectsofneutrondamageonductilefractureproperties.Additionalworkisalsounderwaytoprovidestatisticaljustificationofthe0.8L-TtoT-Lfactor.Inthemeantime,anelastic-plasticfracturemechanicsassessmenthasbeenconductedtodemonstratethatthereissufficientmargintoensurecontinuedsafeoperationofNMP-1.

~J~:l+II Table1-1EstimatedUpperShelfEnergyforNMP-1BeltlineMaterials[MA92]MaterialPlatesWt.%CuMinimumUnirrad.USE(ft-lb)L-T'inimumUnirrad.USE(ft-fb)T-L'rradiationDecrementIUSE(%)12/16/91irradiationDecrementhUSE(%)EOL(25efpy)'redictedUSE(T-L)'2/16/91(ft-Ib)PredictedUSE(T-L)'tEOL(25efpy)'ft-Ib)G 3/G 40.18G 10.236-307-30.206-307-40.276-307-100.227882100809764/50753.365.0'2.0'3.11517162017172019232054.444.254.641.652.453.142.652.740.050.5WetdsW5214/5G13F0.1886054B/4E5F0.221248/4K13F0.221248/4M2F0.22100904904904172020202023232383.072.072.072.080.069.369.369.3'heL-TandT-Ldesignationsapplytoplatematerialonly'easuredusingarchiveplateintheT-Lorientation'rradiatedvaluemeasuredatafluenceof4.78x10"n/cm'Conservativelyestimatedusingdatain[MA90]and[MA91]'astfluenceof7.26x10"n/cm'tthepeak1/4Tposition'astfluenceof1.44x10"n/cm'tthepeak1/4Tposition'atafromReference[CE90]'urveillanceWeld'alculatedbymultiplyingL-Tdataby0.65 I1'\y1,II Table1-2BestEstimateUpperShelfEnergyforPlatesG 1andG-307-4G 1G-307-4MinimumUnirrad.USE(ft-lb)L-T8280MinimumUnirrad.USE(ft-lb)T-U65.664.0Irrad.Decre-menthUSE(%)12/16/91~Irrad.Decre-ment'USE(lo)EOL(25EFPY)1313PredictedUSE(T-L)12/16/91(ft-ib)58.456.9PredictedUSE(T-L)atEOL(25EFPY)4(ft-lb)57.155.7'lateG 3measuredL-TtoT-Lconversionof0.8appliedFastfluenceof7.26x10"n/cm'tthepeak1/4Tposition'aragraph2.2ofRG1.99(Rev.2)used.bUSEconservativelycalculatedusingaverageunirradiateddataandlowestirradiateddatum'astfluenceof1.44x10"n/cm'tthepeak1/4Tposition g1 Table1-3USEDataforPlateG 1UnirradiatedUSE(ft-Ib)Irradiated'SE(ft-Ib)MeasureddataMeasureddataMeasureddata8283957899104AverageofMeasuredData86.793.6ShiftbasedonLowestMeasuredData8278ShiftConservativelyBasedonMeanUnirradiatedandLowestIrradiatedData86.778'hiftisnegligibleandwithinexperimentalscatter'rradiatedtoafastfluenceof4.78x10"n/cm'0 kII 125ClI1-'I00CSV5kkkkkk//kkkkAJkkkkkkkkkkekkk-150150300--TESTTEMPERATURE(F)NINEINILEPOINTUNITI~WELD52'I4/5G43F(SURYEILLANCEWELD)IRRADIATEDDATAWEIBULLFITTRANSITIONWEIBULLFITUPPERSHELFHYPERBOLICTANGENTFITCONFIDENCELIMn(95+)CONFIDENCELIMn(e5%)CONFIDENCELIMIT(86%)CONFIDENCELIMn(esca)UNIRRADIATEDDATAUNIRRADIATEDCHARPYCURVEFigure1-1CharpyImpactEnergyVersusTestTemperatureforIrradiatedWeldSpecimensfromtheNineMilePointUnit1300DegreeCapsule11 I

2.0ApproachtoResolutionNMPCiscurrentlyperforminganASMEdraftAppendixXanalysistoresolvethelowUSEissue.ThisreportdemonstratesthatfortheServiceLevelAandBloadings,theNMP-1USElevelswillnotgobelowtheminimumsafeUSElevelbasedontheAppendixXanalysis.Thisconclusionisvalidregardlessofwhetherthegenericmodelgable1-1)ortheplant-specificmodel(Table1-2)isused.Inadditiontotheelastic-plasticfracturemechanicsassessment,thefollowingelementsoftheNMPCPressureVesselMaterialsIntegrityResearchProgramareexpectedtoprovideusefuldataforconfirmingmarginsofsafety:L-TtoT-LconversionmodellingUpperShelfEnergy(USE)droptrendcurvemodelling~Miniaturespecimentechnologydevelopment~Surveillancecapsulereinsertion12 I1 3.0AnalyticalModelforServiceLevelAandBAnalysis~~Revision11totheDraftASMEAppendixX[ASME92],whichiscurrentlyformulatedasaCodeCase,wasappliedtotheNMP-1G 1andG-307-4plates.Interioraxialandcircumferentialflaws,withdepthsof1/4Tandlengthsequalto6timesthedepth,havebeenpostulated.Toughnessproperties,whichcorrespondtothepostulatedflaworientation,wereusedintheanalysis:T-Lorientationpropertiesforcircumferentialflaws,andL-Torientationpropertiesforaxialflaws.AppendixXdescribesthreepermissibleevaluationapproachesforapplyingtheflawstabilityacceptancecriteriaaccordingtotheflawstabilityrules:J-Rcurve-crackdrivingforcediagramapproach;failureassessmentdiagramapproach;andtheJ-integral/tearingmodulusapproach.ThelatterapproachwasusedintheNMP-1plateevaluations.Thefollowingevaluationcriteria,specifiedinAppendixX,wereapplied;(1)Criterionforflawgrowthof0.1inchJi<Jo.i(2)Criterionforflawstabilitywhere,P')1.25P,J,=appliedJ-integralforasafetyfactoronpressureof1.15,anda1.0factoronthermalloadingJoiJ-integralresistanceataductileflawgrowthof0.1inchP'internalpressureatflawinstabilityP,=accumulationpressure,butnotexceeding1.1timesdesignpressureSinceJ-RcurvedataarenotavailableforA302M,analyseswereperformedusinganA302BandanA533Bmaterialmodel.ThematerialpropertiesusedintheanalysisareaconservativerepresentationofthetoughnessandtensilepropertiesofplatesG 1andG-307-4atplantoperatingtemperature.FurtherdetailsconcerningthematerialmodelareprovidedinSection4.0.13 IIAuVP"irP, 4.0MaterialModelsTheNMP-1belthneplatesareA302Bmodified(A302M)steel.Atthepresenttime,sufficientJ-RdataarenotavailabletoconstructanA302Mmodel.TheNRChasrequested[TEL92]thattheAppendixXcalculationsbeperformedusingbothanA302BandanA533Bmaterialmodel.However,asdiscussedbelow,itisNMPC'spositionthattheA302BmodelistheappropriatemodelfortheNMP-1beltlineplates.JustificationfortheuseoftheA302Bmodelisprovidedbelow.However,boththeA302BandA533BmaterialmodelswereanalyzedinaccordancewiththeNRCrequest.4.1TechnicalBasisforUseofA302BJ-RCurveModel4.1.1MaterialCompositionAnalysisTheASTMnominalplatechemistryrequirementsarecomparedwiththeNMP-1measuredplatechemistrydatainTable4-1.TheASTMA302Bsteelwasthe'.steel..usedinconstructionoftheolderplantswhichareoperatingtoday.NickelwasaddedtoA302Btoimproveductility,andthissteelwasdesignatedA302M.Eventually,theA533Bstandardemerged.ExaminationofTable4-1suggeststhattheNMP-1plateswouldbeaccuratelymodelledbyA533BJ-Rdata.However,theunirradiatedUSElevelsfortheNMP-1platesaresignificantlylowerthanthoseofA533Bmaterials.Further,thesulfur(S)levelsfortheNMP-1platesarehigherthanfortheA533Bmaterialsusedinthenuclearindustry(Figure4-1).Asaresult,theconcentrationofmanganese-sulfideinclusionsisexpectedtobehigherintheNMP-1platesthanintheA533Bplates.Ithasbeensuggested[MA91B]thathigherparticledensitieswouldbeexpectedtolowertheUSEsincetheywouldactasdelaminationsitesduringtheductilefractureprocess.EvidenceforthedetrimentaleffectofSontheUSElevelisshowninFigure4-2.AsshowninFigure4-2,theUSEresponsefortheNMP-1platesisconsistentwiththatoftheA302BmaterialwhichissubstantiallylowerthanthatforA533B.Figures4-3and4-4suggeststhatthebeneficialeffectsofNicanbeoffsetbyhighSlevels.AsshowninFigure4-4,A302MmaterialswithlowScontenthaveUSElevelsconsistentwiththoseofA533Bplates.However,theA302BplateswithSabovethe0.02wt%levelhavesignificantlyreducedUSElevels.Insummary,theNMP-1platesareexpectedtoexhibituppershelffracturebehaviorwhichisrepresentativeofA302Bsteelfromamaterialcompositionperspective.ThisconclusionisbasedsolelyonCharpyUSEdatadependenceonchemicalcomposition.Asdescribedbelow,theJ-RdataforA302BsteelismoreconservativethantheJ-RresponseofA533Bsteels.TheJ-Rdatareportedin[HI89]wereusedtoconstructtheNMP-1materialmodel.ThecompositionoftheNMP-1plates,withtheexceptionofNicontent,compareswellwiththematerialsusedinthe[HI89]studyasshowninTable4-2.14

'tIht*~1~a' Also,theheattreatmentsandCharpydatafortheNMP-1platescomparewellwiththe[HI89]heattreatmentsandCharpydata(Table4-3).Therefore,thefracturebehaviorofthe[HI89]materialisexpectedtoberepresentativeoftheNMP-1plates.4.12A302BDuctileFractureBehaviorFigure4-5illustratestheJ-RcurvespecimensizedependenceforreactorpressurevesselmaterialsotherthanA302B.Joyce[JOY91]concludedthatdeformationJ-RcurveswhicharedevelopedbeyondtheJ-controlledregioncancurveup,curvedown,orstayconsistentwithJ-controlleddata.JoycedevelopedproceduresforextrapolationofdatabeyondthelowhaJ-controlledregion.AsshowninFigure4-6,theextrapolated(smallspecimen)dataagreewellwiththe2TCTdata.IncontrastwiththeJ-Rcurvedatatrendsforotherpressurevesselmaterials,Reference[HI89]reportedanunprecedentedsizeeffectforA302Bsteel.As:showninFigure4-7,thethickerthespecimen,thelowertheJ-Rresponselevelafterinitiation.Whilesimilardatatrendshavebeenobservedforsomepressurevesselmaterials,decreasesintheJ-RcurvesofthemagnitudereportedbyHiserhavenotbeenreportedearlier.ThemicromechanicalexplanationfortheJ-RcurvebehaviorshowninFigure4-7hasnotbeendefinitivelyestablished.Hiser[HI89]hasreportedbrittle-likesplits,orlaminatetearing,forallofthespecimenstested.Thesesplitsareorientedinthedirectionofcrackgrowthwithsmallamountsofmicrovoidcoalescenceintheregionbetweenthesplits.Thesize,relativenumber,anddistributionofthesplitsareapproximatelyconstantforvariousspecimensizes.Hiserconcludedthatthesplitsresultedfromseparationoftheinterfacebetweenthematerialmatrixandtheinclusions(sulfides,aluminides)and/orthesplittingofthemorebrittlealloyrich..bondedstructure(possiblybainite).Theonlyapparentdifferenceinthefractureofsmallandlargespecimensisthetotalnumberofsplitsandnottherelativeproportion.Acompletemicromechanicalexplanationisnotyetavailable.4.2A302BJ-RCurveModelReference[HI89]showedthatalthoughtheJ-Rcurvesaftercrackextensionaresignificantlyaffectedbyspecimensize,J,cisapproximatelyinvariantforspecimensranginginthicknessfrom.5Tto6T.AlthoughnotstatedbyHiserandTerrell,itislikelythatthematerialresponseintheJ-controlledregionisindependentofspecimensize,andthisregionoftheJ-RcurvedominatesJicestimation.Table4-4liststheJicdatafortheA302Bmaterial.TheinvarianceofJ,cwithspecimensizeenablesthedevelopmentofacorrelationbetweenJ-Rresponseanduppershelfenergylevel.Thiscorrelationisneededtodeterminethe15 fPt'~

minimumUSEforwhichtheplantcanbesafelyoperated.TheapproachusedistodevelopacorrelationbetweenJ,candUSE,andthentodeterminelowerboundJ-RcurvesforeachUSElevelofinterest,whichareindexedtotheJicvalue.Thekeyassumptionsmadeindevelopingthismodelarelistedbelow:TheheattreatmentandcompositionoftheNMP-1platesandthematerialsusedinthe[HI89]studyaresimilar.JiccorrelateswithUSElevel.TheUSEisapproximatelyconstantfromthetemperatureofonsetof100%shearto550'F.Jicisapproximatelyconstantbetween392'Fand550'F.The6Tdatareportedin[HI89]isrepresentativeofA302Bfullsizevesselbehavior.Thejustificationforeachoftheseassumptionsisdiscussedbelow.ThespecimensizeindependenceofJ,cisshowninTable4-4andthecomparisonoftheheattreatmentsandchemicalcompositionsoftheNMP-1plateswiththe[HI89]studymaterialsisshowninTable4-3.421JicUSECorrelationA302BJ-Rcurves,J,cdata,andUSEdataweregatheredfromReferences[HA90],[HI83],[HA82],and[HI89].AnalyseswereperformedtoverifythevalidityofacorrelationbetweenJ,candUSE.InaCharpytestontheuppershelf,thecrackadvanceisaccomplishedbyplasticdeformationresultinginmicrovoidcoalescence,particledelamination,andinsomematerials,banddelamination.TheCharpytest,therefore,measuresthetotalamountofenergyrequiredtoadvanceastablecrackinaninitiallynotchedspecimen.TheJ-Rtestisafundamentallysimilarprocessinthattheenergyperunitarearequiredtoadvanceastablecrackismeasured.Ofcourse,theJ-Rtestdiffersinspecimensize,parametersmeasured,localstressfield,andthespecimenisalwaysfatiguepre-cracked.Nevertheless,thebasicprocesswhichismeasuredineachofthetestsissimilar.Infact,itislogicaltoexpectthattheJparameter,measuredatanylevelofcrackextension(ha),wouldcorrelatewithUSE,Hawthorneet.al.[HA82]havedemonstratedthisobservation(Figures4-8through4-10).However,itisnotclearthatanon-lineardependenceisphysicallycorrect.ThedatausedtodeveloptheJ<<-USEcorrelationinthepresentstudyareshowninFigure4-11.Thisdatasetincludesbothplateandwelddata,irradiatedandunirradiateddata,aswellasL-TandT-Lorientations.Thelineartrendinthe16 Il44AI dataisobviousfromtheplot.NoticealsothattheLINDE-80weld,S/A533Bweld,andA302BplatedominatethelowUSE/J<<regionoftheplot.ThefactthatJ<<USEdatafordifferentmaterials,materialheats,anddifferentcrackplaneorientationscorrelatesuggestsafundamentalrelationshipbetweentheJparameter(atorbeyondinitiation)andtheCharpyUSEformaterialswithsimilarflowproperties(E,a~~).LinearregressionwasperformedonthedatashowninFigure4-11.ThelinearmodelyieldedR'aluesof0.93.AsshowninFigure4-12,95%lowerboundconfidenceintervalsweredetermined.The95%lowerboundlimitcanbedeterminedusingthefollowingequations:J<<=31(USE)USE<75ftlbs'ic=3634+793295(USE),USE>75ft-lbswhere,J<<=in-lb/in'SE=ft-lbsThe95%confidencelimitlowerbounddataaresummarizedinTable4-5.ItisimportanttonotethatthedatausedintheJ,c-USEcorrelationisrepresentativeofreactoroperatingtemperatureperformance.Forthedatausedinthecorrelation,theCharpyUSEwasnotastrongfunctionoftemperature.AtypicalCharpycurveforoneofthematerialsusedinthecorrelationisshowninFigure4-13.However,theJ<<valuesdovarystronglywithtesttemperatureon,theuppershelf(Figure4-14).Therefore,alloftheJ,cdatausedinthecorrelationdevelopmentweremeasuredbetween392'Fand550'F.Thevariationoverthistemperaturerangeisrelativelysmall.4.2.2J-RCurveDeterminationNowthattheJ,c-USEcorrelationhasbeenestablished,thenextstepistodevelopaprocedurefordeterminingtheJ-Rcurve,atagivenvalueofJ<<,whichaccountsforthespecimensizeeffectreportedin[HI89].The6TJD-hadatasetreportedinReference[HI89]wasusedtodefinefullthicknessvesselbehavior.Oncetheinitialplateau(700in-lb/in',ha=0.1in.)isreached,theJ-Rcurveisassumedtobeflat.ThisapproachisconsistentwithcurrentASTMdatavaliditylimits.The6TJD-hadatawerereducedbythedifferencebetweenthe6TtestJ,cvalue(525in-lbfin)andthe95%confidencelimitlowerboundJ<<valuegable4-5).17

TheresultsoftheseanalysesareshowninFigure4-15.TheseJ-RcurvesaccountfortheA302Bspecimensizeeffectandtheinherentdatascatter.Therefore,theyareexpectedtobeconservativelowerboundstotheactualmaterialperformance.4.3A533BJ-RCurveModelReference[EA91]reportedtwomodelsforA533Bbasemetals:aCharpymodelandapre-irradiationCharpy(CVNp)model.Bothmodelswerederivedfromamodifiedpowerlawformulation:J=C1(ha)~exp[C3(ha)]TheJ,datawerefittothefollowingequation:lnJ,=lnCl+C2ln(d,a)+C3(ha)using,C2=dl+d2lnCl+d3lnBNC3=d4+d5lnCl+d6lnBlnCl=al+a2lnCVN+a3T+a4lnBwhereha=crackextension(in.)J,=deformationJ-integral(kip-inIin')B=specimennetthickness(in.)T=testtemperature('F)CVN=Charpyimpactenergy(ft-lb)(44)TheconstantsaregiveninTable4-6.TheCVNpmodelusedexpressions(4-2),(4-3),and(4-4)withthefollowingformforlnCl:lnCl=al+a2InCVN+a3T+a4B+a5gtwhere,18 II4h'LpOk~I gt=fluencex10is(E)1MeVg'cm~)Easonet.al.concludedthattheCharpyandCVNPmodelsareequallygoodfortheJddata.Therefore,sincethemodelsareequallygood,theCharpymodelwasusedforthecurrentcasesincethefunctionalformismoreconvenientfordeterminationofJ-RcurvesasafunctionofUSE.The95%C.I.datawasobtainedbyusingthestandarddeviationofthedataaboutthemodel(Se),whichisgiveninTable4-6.Therefore,J,-hadataaredeterminedfortheCharpymodel,andthenmultipliedby0.789toyieldthe95%lowerboundconfidenceinterval.Thus,thefinalformofequation(4-1)is:J=789.0C1(ha)~exp[C3(ha)~](in-lb/in'TheCharpymodel(equation4-6)wasusedtocalculatethepowerlawparametersasafunctionofUSE.TheresultsofthecalculationareshowninTable4-7.The...:following.datawereusedinthemodel,BN=7.281in.T=525'FC4=-0.409andthereducedequationsforthepowerlawmodelare:C1=exp(-3.3802919+1.13ln(USE))C2=-0.0047931+0.116lnC1C3=-0.1397654-0.00920lnClPlotsoftheJ-RcurvesaregiveninFigure4-16.4.4MaterialParametersforElastic-PlasticFractureMechanicsAnalysisRevision11totheASMEAppendixXrequiresseveralmaterialparameterinputsinadditiontotheJ-Rcurvemodel.Thedeterminationoftheappropriateparametersfortheanalysisisdescribedinthissectionofthereport.4.4.1Young'sModulusTableI-6.0of[ASME80]wasusedtodeterminetheelasticmodulusat500'F.Forcarbonsteelswithcarboncontentof0.3orless,wehave:19 LvyTt4'1tv E=26.4x10'si,atT=500'FThemodulusdecreaseswithincreasingtemperature.Theoveralleffectofthemodulusontheelastic-plasticfracturemechanicsanalysisistoyieldmoreconservativeresults(-5%betweenRTand550'F)asthehighertemperaturevaluesareused.Therefore,tobeconservative,the500'FmoduluswasusedintheAppendixXanalysis.SincetheelasticmodulusisessentiallyinsensitivetoneutrondamageforfluencesofinterestforLWRoperation,itisnotnecessarytoaccountforradiationdamage.4.42Poisson'sRatioPoisson'sratioistakenas0.33[DI76].Forthematerialandapplicationbeingconsidered,itisnotnecessarytoadjustfortemperatureorneutronfluenceeffects.4.4.3YieldStressTableI-2.1ofReference[ASME80]showsthatfromRTto500'F,thereisan8ksidropinyieldstress(a).Therefore,thefollowingvaluesforcrwereusedintheAppendixXanalysis:NMP-1PlateG-307-4G 1ts~atRTksi69.466.6ssat500'~Fksi6158TheRTyieldstrengthdataislistedinReference[MA91].TheuseofloweravaluesresultsinmoreconservativeAppendixXanalysisresults.Therefore,the500'Fpropertieswereusedintheanalysis.Theyieldstressincreaseswithneutronfluence.Asaresult,usingtheunirradiatedadatayieldsconservativeresults.20 Il Table4-1PlateChemiseiht%ElementASTMA302B&302MASTMA533BNMP-1Plates'arbon,maxManganesePhosphorous,maxSulfur,maxSiliconMolybdenumNickel0.251.07-1.620.0350.0400.13-0.450.41-0.640.251.07-1.620.0350.0400.13-0.450.41-0.640.37-0.730.18-0.201.16-1.450.012-0.0210.026-0.0340.17-0.260.45-0.520.48-0.56'ukensladelanalysisbyatomicabsorption21 Il Table4-2ComparisonoftheNMP-1PlateChemistrywiththe[HI89]StudyMaterialChemistryElementCarbonManganesePhosphorousSulfurSiliconMolybdenumNickelNMP-1Plates0.18-0.201.16-1.450,012-0.0210.026-0.0340.17-0.260.45-0.520.48-0.56HI89Material0.211.460.0100.0210.240.540.2322 lr Table4-3"ComparisonofNMP-1PlateHeatTreatmentsandCharpyDatawiththe[HI89]StudyMaterialHeatTreatmentsandCharpyDataItemNMP-1PlatesSecimensHI89MaterialHeatTreatment1550-1600'F,4hr;waterquench,4hr1650+25'F,6hr;waterquench1150+25'F,10.5hr.,aircool1200+25'F,6hr;aircooltestspecimensstressrelievedat1150+25'F,30hrsstressrelievetestspecimensonly1150+25'F,40hrs1150+25'F,24hr,furnacecoolto600'F,aircoolUSE(T-L)68.5(G 3)53.6T302623 JIl, Table4-4SummaryofJ,cDataasaFunctionofSpecimenSizeforA302B'aterial[HI89]Testedat180'FSecimenIDSpecimenThicknessJDeformation(Jn)~i-bi'50-113V50-116V50-114V50-117V50-115V50-118V50-119V50-120V50-121AverageV50-109V50-112AverageV50-105V50-108AverageV50-102V50-103AverageV50-1010.5T0.5T0.5T0.5T0.5T0.5T0.5T0.5T0.5T0.5T1T1T1T2T2T2T4T4T4T6T662560662405628525611657622592674634654594651623600588594525'-Lorientation,USE=52ft-lbuppershelfbehavioratT>150'F24 4

Table4-595%ConfidenceLimitLowerBoundJ,cDataUSEFT-LBS10I~IN-LB30.82061.63092.435107.840123.24550138.6154.055606570169.4184.8200.2215.67580231.0271.39095100310.9350.6390.2429.925 tgC Table4-6ConstantsforJ,ModelforA533BSteel[EA91)C2C3a4asd,d3ParameterlnCIa,Variable(constant)lnCVNorlnCVNT(constant)lnCICharpyModel-2.441.13-0.002770.08010.07700.116-0.0412CVN,Model-2,531.15-.002700.0760-0.01040.07700.116-0.0367C4A(4dsd5NPointsS.(constant}lnCI(exponent)ln@~its-0.0812-0.00920-0.0295-0.40922950.144-0.0812-0.00920-0.0263-0.40822950.145Rc"..os-1.645S,-1S,-2S,-3De0.7890.8660.7490.6490.7880,8650.7480.64726 JJ7 Table4-7A533BMaterialModelforNMP-1MaterialCondition10ft-lbUSE20ft-lbUSE30ft-lbUSE40ft-lbUSE50ft-lbUSE60ft-lbUSE70ft-lbUSE80ft-lbUSE90ft-lbUSE100ft-ibUSEC10.45915351.00489751.58893052.19930612.83004923.47751334.13922154.81337355.49859736.1938100C2-0.0950841-0.00422640.04892200.08663140.11588100.13977970.15998580.17748910.19292810.2067387C3-0.1326044-0.1398103-0.1440256-0.1470163-0.1493361-0.1512315-0.1528341-0.1542223-0.1554467-0.156542127

Mnvs.SforLWRVESSELMATERIALS0.040.03~eNQPieoioo~~~oo~h0.02CLCO0.010.00oo~ol~~oo~ooooooo~~~~~~~0~~~~~~~~o~\~oo~~oh0hh00+00+4hCO+;+t~++0'+t~~op~~~~oo~~~~~h~~+A5338PlateaA508Plate~A3028Plate0A302MRate0.00.51,0ManganeseSVt.%)1.5.2.0Figure4-1PlotofSandMnLevelsforLWRPressureVesselMaterials28 lI fisC~USEvs.SforLWRVESSELMATERIALS200~~150LLI-Ih~00CUJCO5080~~~~0~~~0~0~0~~0YI~~a+~;+~yS0~~j~~~\~tt\~0~~0~~OOA0:+~5+"ItloOIgo0'.4+~~~0~~0~0~0~0~0~0~1~1~~1~~~~~~~~Ot(~~0~~~~~~~~~~hj)NMp-1~+~+1~~+A5338PlateaA508Plate>A3028Plate0A302MRate0.000.010.02SulphurONt.X)0.030,04Figure4-2PlotofUSEvs.SContentShowingtheDetrimentalEffectofSontheUSELevel29 1

USEvs.NiforLWRVESSELMATERiALS200~~150I-100CUJCO50~~~~~op~b~~~~ooof~~~o~o~ooO~oÃgoogoo.oVg~~~5~os~~~'os~~~o~o~o~o~O~~oo~~AooA~oo~~~~~.:pMvg.1~o~~~~~o~~o~~~o~~o~~o~o~~oogo~~~~~~o4~~o~~oo~os+o+Qctp+A533BPhteaA508Rate>A302BPlate0A302MPlate0.00.10.20.30.40.50.60.70.8Nickel0Nt,%)Figure4-3PlotofUSEvs.NiContentShowingtheGenerallyBeneficialEffectsofNiontheUSELevel30

CoUSEvs.NiforLWRVESSELMATERIALS200150Ico100CUJCO50R0~e~~~~~~ezS-.010~o~~~~i~ooooooo.022'<<.026',i~~~~e~~~~~~~~~'~~~~~~o~~~~~~~4e4e'.pS-.010~ooooo,~ooooo>>~~~oooQ~~~~8.01Bp;pprOi7':.."~)g+ep".pS.917~gppS<.020~~~~~~I~~~~~oo~ooo~ooe~~~ooooAeoooo'.pS.030e~o~oo~oo~~~~~~~~~o~~~~~e$~eooo~eoeeooo~oo~+A533BPlateaA508Plate<A302BPlate0A302MPlate0,00.10.20.3OA0.50.60.70.8Nickel0/Vt,%)Figure4-4PlotofUSEvs.NiContentShowingtheImpactofSContentinCounteractingtheBeneficialNiEffect31 l4 400035003000E2500c7200015001000500~o0~ox+xxxx++44+OOC1O000.394TCTL0.5TCTX05TCT01TCTG2TCT00.10.20.30.40.50.60.7JA.8CRACKEXTENSION(in.)Figure4-5:J-RCurvesforLinde80Welds[JOY91]32 I

4000350030002500CO2000C1500LimitofExtendedValidityRegionfor1TSpecimenslT~0.5T~0.394T1000tLimitofExtendedValidityRegionfor1/2TSpecimensCl2TCTOATA500LimitofExtendedValidityRegionfor0.394TSpecimen0.10.20.30.40.50.60.7O.BCRACKEXTENSION(in.)Figure4-6:ExtrapolationsonSmallSpecimenJ-RCurves-Linde80Welds[JOY91].33

~'%g A302BJ-RDATAFORVARIOUSSPECIMENTHICKNESSES15001000OHcd500O004OeO~~0~gA~o)~~~~~~~~~~J~>44mzqg44~~k~~o~~~4~~~~WO~~~o&IH~~~12Deltaa(In.}~A~~~~~~~~~~(~~I~~~~~~~~~01~~~~~0~0~<I0,5TDATA<0.5TDATA00,5TDATA40.5TDATA*0.5TDATA*0.5TDATA1TDATA+1TDATA02TDATAi2TDATA<4TDATA>4TDATA~6TDATA4Figure4-7ComparisonofJ~-RCurvesforA302BPlate(DataTakenFrom[HI89])34 1

EPRINUCLERRVESSELSTEELS288C,1T-CT,28-25/SGFilledSymbols=IrradiatedkkLh188Cv(joule)158Figure4-8ComparisonofJ<<andtheCvUpperShelfLevelforAllSteelsInvestigated[HA82]35 ml>

EPRINUCLERRVESSELSTEELS688288C,1T-CT,28-25/SGFilledSymbols=Irradiated<880OOOyQ~8~O!88128Cv(joule)168288Figure4-9ComparisonofCvUpperShelfLevelwiththeJLevelataPointontheRCurveWhereJfl=4.4.Here,theCorrelationwithCshelfisBetterthanthatbetweenJ,eandtheCvShelf[HA82]36

EPRINUCLERRVESSELSTEELS880288oC~1T-CT,28-25/SGFilledSymbols=Irradiated688III-5884/Ah~hLkA~kk188Cv(joule)158288Figure4-10ComparisonofCvUpperShelfLevelwiththeJLevelataPointonthe'RCurvewhereJff=8.8forAllMaterialsInvestigatedHere,theCorrelationwithCShelfisBetterthanthatBetweenBothJ,oandJatJff=4.4andtheCShelfIHA82]37

~t(Jic/USECorrelationData20001500~5It000500vkA303BPLATEA5SSBPLATEA508FORGINGSIA5338WELDLINDE-80WELDLINDE-0091WELD50'100UpperShelfEnergy{Ft-Lbs)Figure4-11DataSetUsedtoDevelopJ,C-USECorrelation38 II Jic-USE95%C.I.LOWERBOUNDLIMIT200015001000I0500~~:~~y'.~~'.~~.:~I~:0050100USE(Ft-Lbs)150Figure4-12JicUSECorrelationand95%LowerBoundConfidenceLimit39

~~

Temperature('F)288388488688125188CQeR382-H(UBR"l6,CapsuleR,Rs-Irradiated)CCE-21188J3I7SC5QQ.2S188158PG8258388Temperature('lkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk+kkkkkkk+kkkkkkkkk+Cu~8+Btanhf<T-To)AC)ABCTo~Enlish41~92f't-1b37~21f't-1b85.81OF148~244Ft!ettlc56~84J58.45J47.67OC64.58kCCu~30,f't-1b<41J)atT~119.7OF48.74CUpperShelf'nergy~79~1f't-1b107.3Jkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk+Figure4-13A302BCharpyDataIllustratingtheWeakTemperatureDependenceoftheUSEonTemperature[HA90]40

tORNImIit30(NI00CNFt13L3:!30IMa0iruiaiI~(E.I~)+Ci>itIN"0I00IORAFillKli(1l056A!lfCVf3(NtMQe~IMINgII00IHIQCft%ILIC(e('1-weIOftNILgffi(30iNiNQo(NII0C~'<H<lttl(C3incI31iJ~(41KFigure4-14PlotofKgcvs.TestTemperatureShowingtheStrongTemperatureDependenceontheUpperShelf[HA90]41

/tf"N A302BJ-RCURVESFORVARIOUSUSELEVELS~95%Cj.LOWERBOUNDJWDATA06TMEANJ-RDATAAT180F-52Ft-Lbs(TL)Q700600600o4QQo300D200~~4g44'~1~~~~~~gott~~;~t44ttpCsRtI..aljA,O,.I,t...AAt,~A1tAMtM~~AA..Jtt~tMMtt~~~~~~~~~~ION509PS44tp'NtIIIIeaftTs0'~~~~~~~I~~~attoo~~~~0Pt~~tt,A}t.A,A,t~,A,~~A,A~tNbl.tlat@,A9,0(00.3Deltaa(In.)Figure4-15LowerBound95%CIJ-RCurvesforA302BThickSectionMaterial(6TDataTakenFrom[HI89])42

A533BJ-RCURVESFORVARIOUSUSELEVELS600060004000I3000COEo2000D1000;VSE100FTMrr\rrorr~o~~~~~~~I~~~~~~~~~~~~~~~~~~~~oro$10pgooFTorLBorrrr~ooi:USE-80FTM~~~~~~~~~~~y4~~~~~~~~Ir~~~~~~oo~~~~~o~~~~~~opom~~~~~~~~~QSE~70FT-LBrrr~roI~I~~<~~~~~~~~~>orrr~~~~~~~~~~~oVSF6Qo~~~IIr~VSE60FT-LB)IIIItyo~p~~~~O~~~~~~~~~~~~o~~~~~~oR~:USE-40Fi-LB/Il/Ioor~jr//I:USE30FT-LB//.:USE20FT-LBIUSE10FTM0Deltaa(In.)Figure4-16LowerBound95%CIJ-RCurvesforA533BThickSectionMaterial43 P1L,I 5.0Elastic-PlasticFractureMechanicsAssessment~~~~TheUSEŽcode[USE92],Version2.0,wasusedforcalculationoftheminimumallowableUSEsubjecttothedraftAppendixX(Revision11)evaluationcriteria.TheUSE~Version2.0codehasbeenvalidatedinaccordancewiththerequirementsoftheMPMResearch8'cConsultingNuclearQualityAssuranceProgram.USEŽallowsJ-Rdatatobeinputaspointwisedataorintheformofpowerlawcoefficients.Thepointwisedatainputoptionwasused.5.1ModelDescriptionInadditiontothematerialmodelinput,USEŽ2.0requiresthefollowinginputparameters:VesselWallThicknessVesselInnerRadius7.281in(FSARTableV-1)106.344in(FSARTableV-1)MaximumAccumulationPressure=1.1DesignPressure=1375psig(TechnicalSpecificationBasesfor2.2.1)MaximumCooldownRate100'F/hrAsstatedintheFSAR,the1375psigpressureand100'F/hrcooldownboundalltheServiceLevelAandBloadings.5.2CalculationsforA302BMaterialModel5.2.1PlateG 1AnalysisTheresultsofthePlateG 1analysis,usingtheA302Bmaterialmodel,areshowninFigures5-1through5-6.Basedonthesecalculations,andtheReference[ASME92]evaluationcriteria,thelimitingcaseistheaxialflaw(L-Tmaterialproperties).Applicationoftheflawinstabilitycriterion,whichisthelimitingcriterion,resultsinanallowableUSErangeof23ft-lbsorhigherasshowninFigure5-5.5.2.2PlateG-307-4AnalysisTheresultsoftheplateG-307-4analysisusingtheA302BmaterialmodelareshowninFigures5-7through5-12.AsinthecaseofplateG 1,thelimitingcaseistheaxialflaworientation.Applicationoftheflawinstabilitycriterion,whichisthelimitingcriterion,resultsinanallowableUSErangeof23orhigherasshowninFigure5-11.

4lI~4'-~

5.3CalculationsforA533BMaterialModel5.3.1PlateG 1AnalysisTheresultsoftheplateG 1analysisusingtheA533BmaterialmodelareshowninFigures5-13through5-18.AsintheA302Bmodelanalysis,thelimitingcaseistheaxialflaworientation.ApplicationoftheASMEAppendixXcriteriaindicatesthattheminimumUSElevelisbelow10ft-lbs,whentheA533Bmaterialmodelisapplied.5.3.2PlateG-307-4AnalysisTheresultsoftheplateG-307-4analysisusingtheA533BmaterialmodelareshowninFigures5-19through5-24.AsintheplateG 1analysis,usingthismaterialmodel,theminimumUSElevelisbelow10ft-lbs.5.4SummaryofConditionsAnalyzedTheresultsoftheelastic-plasticfracturemechanicsassessmentareshowninTable5-1.Asexpected,theA302Bmaterialmodelyieldsthemostconservativeresults.AsdiscussedinSection4,0,theA302BmaterialmodelbestrepresentstheNMP-1beltlineplates.TheASMEflawstabilitycriterionismoreconservativethanthe0.1inchflawgrowthcriterionfortheNMP-1plates.Basedonthesecalculations,ithasbeenconcludedthattheNMP-1platesG 1andG-307-4mustbemaintainedabove23ft-lbs.45 l,<ei Table5-1MinimumUpperShelfEnergyLevel(AxialFlaw)forNMP-1PlatesBasedontheASMEDraftAppendixXEvaluationCriteriaforServiceLevelsAandBMinimumUSE(Ft-Lbs)PlateG 1' 1G-307-4G-307-4MaterialModelA302BA533BA302BA533BFlawGrowthof0.1in.CriterionJi<Jo.i<1013<10FlawStabilityCriterionP'1.25P,23<1023<1046

10Ft.-Lbs.NINEMILEPOINTUNIT1PLATEQ 1A302BModef/L-T.Orientation/AxialFlaw,20Ft100090030Ft.-Lbs.80004700C800C600C0400E300Cl200l~j40Ft.-Lbs.60Ft.-Lbs.60Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.90Ft.-Lbs.10000.000.200.400.600.801.00Deltaa(In.)100Ft;Lbs.~J-Appliedat0.1ln.Figure5-1EvaluationUsingCriterionforFlawGrowthof0.1in.forPlateG 1ModelledUsingA302BMaterialModel(AxialFlaw)47

~TI1t 10Fk.-LbI.NINEMILEPOINTUNIT1PLATEQ 1A3028Model/7-LOrientation/Circum.Flaw,20FtLbs100090030Ft.-Lbs.80040Ft:Lbs.700aCO8OOC600C0400E300Cl7200/60Ft:Lbs.80Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.90Ft.-Lbs.100100Ft.-Lbs.0.000.200.400.800.801eooDeltaa(In.)~J-Appliedat0.1ln.Figure5-2EvaluationUsingCriterionforFlawGrowthof0.1in.forPlate6 1ModelledUsingA302BMaterialModel(CircumferentialFlaw)

~~

10Fl..Lbe.NINEMILEPOINTUNIT1PLATEG 1A302BModel/L-TOrientation/AxialFlaw100090030Ft.-Lbs.80040Ft.-Lbs.700tlOBOOI600C0400E300Cl720060Ft.-Lbs.BOFt,-Lbs.70Ft.-Lbs.80Ft.-Lbs.90Ft.-Lbs.10000.000.200.40O.BO0.801.00TearingModulus100Ft.-Lbs.T-AppliedFigure5-3J-TMaterialandJ-TAppliedCurvesforPlateG 1ModelledUsingA302BMaterialModel(AxialFlaw)49 10 10Ft.-Ltt~.NINEMILEPOINTUNITIPLATE0 1A302BModei/7-LOrientation/Ciroum.Flaw100090030Ft.-Lbs.80040Ft.-Lbs.700cCO800Ic600C0C400E~eet0300A60Ft.-Lbs.80Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.20090Ft.-Lbs,100100Ft.-Lbs,0.000.200.400.800.801.00TearingModulusT-AppliedFigure5-4J-TMaterialandJ-TAppliedCurvesforPlateG 1ModelledUsingA302BMaterialModel(CircumferentialFlaw)50

NlNEMlLEPolNTUNlT5PLATEG 'lA302BModel/L,>>TOrientation/AxialFlewOnsetof--Accumulation--1.26'Accum.FlawInstab.pressurePressure20001900180017001BOO1500COCO1400130012001100100001020304050BO7080UpperShelfEnergy(Ft.-Lbs.)Figure5-5EvaluationUsingCriterionforFlawStabilityforPlateG 1ModelledUsingA302BMaterialModel(AxialFlaw)51 I

NINEMILEPOINTUNIT'IPLATEG IA302BModel/7-LOrientation/Circum.FlawOnsetof-"Accumulation--1.25'Accum.FlawInstab.PressurePressure40003500SOOOICLIa2500COIOIL,20001500100001020Sosoeo7080UpperShelfEnergy(Ft.-Lbs.)Figure5-6EvaluationUsingCriterionforFlawStabilityforPlateG 1ModelledUsingA302BMaterialModel(CircumferentialFlaw)52 b~5UV 10Ft.-Lbs.NINEMILEPOINTUNITIPLATE0-307-4A302BModel/L-TOrientation/AxialFlaw100090D30Ft.-Lbs.8OO40Ft.-Lbs.700tCO8OOC600C0ttt400E3004200le/~60Ft.-Lbs.80Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.90Ft.-Lbs."'foo0D.DDD.2D0.400.8D0.801.00Deltaa(In.)100Ft.-Lbs.~.J-Appliedat0.1ln.Figure5-7EvaluationUsingCriterionforFlawGrowthof0.1in.forPlate6-307-4ModelledUsingA302BMaterialModel(AxialFlaw)53 5~

10Ft.-LbI.NINEMILEPOINTUNIT1PLATEG-307-4A302BModel/T-LOrientation/Clroum.Flaw10009OO30Ft.-Lbs.80040Ft.-Lbs.700C8OOIC800aa400E300Q2001000/:Jle'II'Ili60Ft.-Lbs.80Ft.-Lbs.70F!.-Lbs.80Ft.-Lbs.90Ft.-Lbs.100Ft,-Lbs.0.000.200.400.600.801.00Deltaa(In.)~J-Appliedat0.1ln.Figure5-8EvaluationUsingCriterionforFlawGrowthof0.1in.forPlateG-307-4ModelledUsingA302BMaterialModel(CircumferentialFlaw)54 r

10Ft.-Lbs.NINEMILEPOINTUNIT0PLATEG-307-4A302BModel/L-7Orientation/AxialFlaw100090030Ft.-Lb@.80040Ft.-Lbs.700ceooC600c04006300Cl60Ft.-Lbs.eOFt.-Us.70Ft.-Lbs.80Ft.-Lbs.20090Ft:Lbs.10000.000.200.400.800.801.00TearingModulus100Ft.-Lbs.T-AppliedFigure5-9J-TMaterialandJ-TAppliedCurvesforPlateG-307-4ModelledUsingA302BMaterialModel(AxialFlaw)55 1rfl4 10Ft.-LbaNINEMILEPOINTUNIT1PLATEQ-307-4A302BModel/T-LOrientation/Circum.Flaw100090030Ft.-Lbs.80040Ft.-Lbs.700eCOeooC600Co400E300Ch60Ft.-Lbs.eoFt.-t.bs.70Ft.-Lbs.80Ft.-Lbs.20090Ft.-Lbs.10000.000.200.400.800.801.00TearingModulus100Ft.-Lbs.T-AppliedFigure5-10J-TMaterialandJ-TAppliedCurvesforPlateG-307-4ModelledUsingA302BMaterialModel(CircumferentialFlaw)56

NINEMILEPOINTUNIT1PLATE6-307-4A302BModel/L>>TOrientation/AxialFlaw-~-Onsetof--Accumulation--1.26'Accum.FlawInstab.PressurePressure200019001800170018001500COII14001300120011001000010203060eo7080UpperShelfEnergy(Ft.-Lbs.)Figure5-11EvaluationUsingCriterionforFlawStabilityforPlateG-307-4ModelledUsingA302BMaterialModel(AxialFlaw)57

NINEMILEPOINTUNITIPLATEG-307-4A302BModel/T-LOrlentatlon/Circum.Flaw-~-Onsetof--Accumulation--1.26'Accum.FlawInstab.PressurePressure400035003000I02500COIOILaCL20001500100001020304050507080UpperShelfEnergy(Ft.-Lbs.)Figure5-12EvaluationUsingCriterionforFlawStabilityforPlateG-307-4ModellingUsingA302BMaterialModel(CircumferentialFlaw)58

~t' 10FL-Lbs.NINEMILEPOINTUNIT1PLATEC 1A533BNtodel/L-TOrientation/AxialFlaw,20Ft500030Ft.-Lbs.400040Ft.-Lbs.aCl3000Icc0Cti2000EICL1000t/I50Ft.-Lbs.60Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.90Ft.-Lbs.100Ft.-Lbs.0.000.200.400.600.801.00Deltaa(In.)~J-Appliedat0.1ln.Figure5-13EvaluationUsingCriterionforFlawGrowthof0.1in.forPlateG 1ModelledUsingA533BMaterialModel(AxialFlaw)59

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10Fl.-Lbe.NINEMILEPOINTUNIT1PLATEG 1A633BModel/L-TOrientation/AxialFlaw20FtLbs60004000L.:30Ft.-Lbs.40Ft.-Lbs.CCO3000ICC02000EICl50Ft.-Lbs.60Ft.>>Lbs.70Ft.-Lbs.80Ft.-Lbs.100090Ft.-Lb@.00TearingModulus100Ft.-Lbs.T-AppliedFigure5-15J-TMaterialandJ-TAppliedCurvesforPlateG 1ModelledUsingA533BMaterialModel(AxialFlaw)61

10Ft.-Lbs.NINEMILEPOINTUNIT1PLATEG 1A633BModel/7-LOrientation/Clroum.Flaw---20Ft.-Lbs.60004000L:.30Ft.-Lbs.40Ft.-Lbs.C3000Cc0Ct$20006Ch50Ft.-Lbs.80Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.100080Ft.-Lbs.100Ft.-Lbs.12TearingModulusT-AppliedFigure5-16J-TMaterialandJ-TAppliedCurvesforPlateG 1Modelled'singA533BMaterialModel(CircumferentialFlaw)62

NINEMILEPOINTUNIT1PLATEG 1A6338Model/L-7Orientation/AxialFlaw-~-Onsetof"-Accumulation--1.26'Accum.Flawlnstab.PressurePressure6000450040003500COCLIa3O0OIOI4250020001600100001020306oeo7080UpperShelfEnergy(Ft.-Lbs.)Figure5-17EvaluationUsingCriterionforFlawStabilityforPlateG 1ModelledUsingA533BMaterialModel(AxialFlaw)63

~~NINEMILEPOINTUNITIPLATEG IA633BModel/Y-LOrientation/Clroum.Flaw Onsetof"-Accumulation--1.26'Accum.FlawInstab.PressurePressure10QeQ.~oCCON~coQ5QCL10203040soeo7080UpperShelfEnergy(Ft.-Lbs.)Figure5-18EvaluationUsingCriterionforFlawStabilityforPlateG 1ModelledUsingA533BMaterialModel(CircumferentialFlaw)64

'I

~'10Ft.-LbI.NINEMILEPOINTUNIT1PLATEQ-307-4A5338Model/L-TOrientation/AxialFlaw600030Ft.-Lbs.400040Ft,-Lbs.cCO3000cC02000ELe0ICl50Ft.-Lbs.60Ft.-Lbs.,70Ft.-Lbs.80Ft.-Lbs.10000t1'I90Ft.-Lbs.100Ft.-Lbs.0.000.200.400.600.801.00Deltaa(In.)~J-Appliedat0.1ln.Figure5-19EvaluationUsingCriterionforFlawGrowthof0.1in.forPlateG-307-4ModelledUsingA533BMaterialModel(AxialFlaw)65

10Ft.-Lbs.NINEMILEPOINTUNIT1PLATEG-307-4A533BModel/T-LOrientation/Circum.Flaw,20Ft600030Ft.-Lbs.400040Ft.-Lbs.CCO3000Itc0CI200080OCl1000//I50Ft.-Lbs.80Ft.-Lbs.70Ft,-Lbs.80Ft.-Lbs.90Ft.-Lbs.100Ft.-Lbs.0.000.200.400.800.801.00Deltaa(In.)~J-Appliedat0.1ln.Figure5-20EvaluationUsingCriterionforFlawGrowthof0.1in.forPlateG-307-4ModelledUsingA533BMaterialModel(CircumferentialFlaw)66

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e~'0Ft.-Lbs.NINEMILEPOINTUNIT'IPLATEG-307-4A533BModel/L-TOrlentatlon/AxialFlaw.20Ft60004000L:30Ft.-Lbs.40Ft.-Lbs.ctO3000ec0sga42000EICl50Ft.-Lbs.60Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.100090Ft.-Lbs.00TearingModulus100Ft.-Lbs.T-AppliedFigure5-21J-TMaterialandJ-TAppliedCurvesforPlateG-307-4ModelledUsingA533BMaterialModel(AxialFlaw)67

10Fl.-Lbe.NINEMILEPOINTUNIT1PLATEG-307-4A6338Model/7-LOrientation/Ciroum.Flaw60004000eL.:30Ft.-Lbs.40Ft.-ibs.tCO3000IC:c0Ctt2000EClCl50Ft.-Lbs.60Ft.-Lbs.70Ft.-Lbs.80Ft.-Lbs.100090Ft.-ibs.0012TearingModulus100Ft.-Lbs.T-AppliedFigure5-22J-TMaterialandJ-TAppliedCurvesforPlateG-307-4Modelled'singA533BMaterialModel(CircumferentialFlaw)68

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NINEMILEPOINTUNIT1PLATEG-30T-4A533BModel/L-TOrientation/AxialFlawOnsetof--Accumulation--1.25'Accum.FlawInstab.PressurePressure6000460040003500COCL3000QLe250020001600100010203040507080UpperShelfEnergy(Ft.-Lbs.)Figure5-23EvaluationUsingCriterionforFlawStabilityforPlateG-307-4ModelledUsingA533BMaterialModel(AxialFlaw)69

NINEMlLEPOINTUNITIPLATE6-307-4A633BModel/T-LOrientation/Circum.Flaw-R-Onsetot"-Accumulation--1.26'Accum.FlawInstab.PressurePressure10QCL~6Ic05th2cog5Q010203050507080UpperShelfEnergy(Ft.-Lbs.)Figure5-24EvaluationUsingCriterionforFlawStabilityforPlateG-307-4ModelledUsingA533BMaterialModel(CircumferentialFlaw)70 (way>x' 6.0SummaryandConclusionsTheelastic-plasticfracturemechanicsanalysesperformedhaveshownthattheaxialflawisthelimitingorientation.TheNMP-1A302MbeltlineplatesarebestmodelledusinganA302BJ-Rcurvemodel.DuringtheSeptember30,1992,meeting,theNRCindicatedreluctanceinacceptingthe0.8L-TtoT-Lconversionwithoutadditionalstatisticalevidence.WorkiscurrentlybeingconductedtodemonstratethatanL-TtoT-Lconversionfactorabove0.65isappropriatefortheNMP-1beltlineplates.Nevertheless,asshowninTable6-1,thereisatpresentsufficientmarginagainstductilefractureusingtheRG1.99(2)genericmodelwitha0.65conversionfactor.Since1972,theT-LorientationhasbeenrequiredbyASMEandusedinthenuclearindustryforanalysisofpressurevessels.The50ft-lbscreeningcriterionisalsoevaluatedbasedontheT-Lorientation.However,amoreconsistentapproachwouldbetoevaluatetheaxialflawusingL-TCharpyUSEdata,andtoevaluatethecircumferentialflawusingT-LCharpydata.AsshowninTable6-2,whentheappropriateorientationisconsidered,themarginbetweentheminimumallowableUSEandthepredictedactualUSEatEOLisontheorderof38ft-lbs.ThismarginofsafetyisinadditiontothesafetyfactorsappliedtotheASMEAppendixXequations.Therefore,ithasbeenconcludedthattheNMP-1vesselissafeintermsofductilefracturefailurethroughEOLforServiceLevelAandBloadings.TheLevelCandDloadingsarecurrentlybeinganalyzedandwillbereportedtotheNRCinaseparatereportinthenearfuture.71

Table6-1ComparisonoftheMinimumUpperShelfEnergyLevel(AxialFlaw)forNMP-1PlatesBasedontheASMEDraftAppendixXEvaluationCriteriaforServiceLevelsAandBwiththeRegulatoryGuide1.99(2)ModelEstimatesPlateMaterialModelFlawGrowthof0.1in.CriterionJt<Jo.tFlawStabilityCriterionP~>1.25P,MinimumAllowableUSE(Ft-Lbs)forAxialFlaw(L-TOrientation)RGL99(2)Model'T-LOrientation)MinimumUSE(Ft-lbs)PredictionatEOLG 1G-307-4A302BA302B1313232342.640.0'enericmodelappliedwithoutplant-specificdata72

Table6-2MinimumUpperShelfEnergyLevelMarginsforNMP-1PlatesforServiceLevelAandBLoadingsPIateMaterialFlawModelOrientationMinimumAllowableUSEFt-LbCharpySpecimenOrientationConservativelyPredictedCharpyUSEat~EDL'-LbMargingt-L+bsG 1A302BAxial23L-T65.642.6G 1A302BCircumferential<10T-L42.6>32.6G-307-4G-307-4A302BA302BAxialCircumferential23<10L-TT-L61.640.038.6>30.025EFPYexposureprojectedforEOLin2009.TheRG1.99(2)model,withoutplant-specificdata,wasusedtoconservativelyestimatetheminimumEOLUSElevels.73 4C.+1A4'4 7.0References[ASME80]ASMEBoilerandPressureVesselcode,SectionIII,"RulesforConstructionofNuclearPowerPlantComponents",July1,1980[ASME92]ASME,DraftCodeCaseN-XXX,"AssessmentofReactorVesselswithLowUpperShelfCharpyEnergyLevels",Revision11,May27,1992.[CE90]"NiagaraMohawkPowerCorporationNineMilePointUnit1ReactorVesselWeldMaterials",ReportNo.86390-MCC-001,ABBCombustionEngineeringNuclearPowerCombustionEngineering,Inc.,Windsor,Connecticut,June,1990.[DI76]Dieter,G.E.,MechanicalMetallurgy,SecondEdition,McGraw-Hill,1976.[EA91]Eason,E.D.,Wright,J.E.,Nelson,E.E.,"MultivariableModelingofPressureVesselandPipingJ-RData",NUREG/CR-5729,May,1991.[FR92]Freyer,P.,Manahan,M.P.,PresentationtoProjectFERMI,"PlantLifeExtensionTechnology:Non-DestructiveReactorMaterialsEmbrittlementMonitoringUsingPositronAnnihilation",May,1992.[HA82]Hawthorne,J.R.,Menke,B.H.,Loss,F.J.,Watson,H.E.,Hiser,A.L.,Gray,R.A.,"EvaluationandPredictionofNeutronEmbrittlementinReactorPressureVesselMaterials",EPRI/NP-2782,preparedforEPRI,December,1982.[HA90]Hawthorne,J.R.,Hiser,A.L.,"InfluenceofFluenceRateonRadiation-InducedMechanicalPropertyChangesinReactorPressureVesselSteels",NUREG/CR-5493,March,1990.~[HI83],.Hiser,.A.L.,Fishman,D.B.,"J-RCurveDataBaseAnalysisofIrradiatedReactorPressureVesselSteels",preparedforEPRIDecember,1983.[HI89]Hiser,A.L.,Terrell,J.B.,"SizeEffectsonJ-RCurvesforA302BPlate",NUREG/CR-5265,January,1989.[JOY91]Joyce,J.A.,Hackett,E.M.,"ExtensionandExtrapolationofJ-RCurvesandTheirApplicationtotheLowUpperShelfToughnessIssue",NUREG/CR-5577,March,1991.[MA85]Manahan,M.P.,"ProcedurefortheDeterminationofInitialRTNinCaseswhereLimitedBaselineDataareAvailable",November,1985.74 (awlc*ky~x>k4

[MA85a]Manahan,M.P.,Quayle,S.F.,Rosenfield,A.R.,andShetty,D.K.,"StatisticalAnalysisofCleavage-FractureData",Invitedpaper,ConferenceProceedingsoftheInternationalConferenceandExhibitiononFatigue,CorrosionCracking,FractureMechanics,andFailureAnalysis,SaltLakecity,December2-6,1985.[MA90]Manahan,M.P.,"NineMilePointUnit1RT~Determination",FinalReportfromMPMResearch&ConsultingtoNMPC,September28,1990.[MA91]Manahan,M.P.,"NineMilePointUnit1SurveillanceCapsuleProgram",NMEL-90001,January4,1991.[MA91b]Privatecommunication,M.P.Manahan(MPMResearch&Consulting)toJ.Helm(ColumbiaUniversity),"PhysicallyBasedUpperShelfFractureModelforFerriticPressureVesselSteels",January,1991.[MA92]Manahan,M.P.,Soong,Y.,"ResponsetoNRCGenericLetter92-01forNineMilePointUnit1",June12,1992.[McFRAC]Manahan,M.P.,et.al.,"StatisticalAnalysisMethodologyforMechanicsofFracture",FinalreporttoBattelle'sCorporateTechnologyDevelopmentOffice,1984.[MTEB81]NRCBranchTechnicalPositionMTEB5-2,"FractureToughnessRequirements",Revision1,July,1981.[OD86]Odette,G.R.,Lombrazo,P.M.,"TheRelationBetweenIrradiationHardeningandEmbrittlementofPressureVesselSteels",Proceedingsofthe12thASTMSymposiumontheEffectsofIrradiationonMaterials,1986.[RG1.99]RegulatoryGuide1.99,Revision2,"RadiationEmbrittlementofReactorVesselMaterials",May,1988.[TEL92]TelephoneconferenceregardingNMP-1lowUSE,NRCstaff,NMPClicensingandengineeringstaff,MPMResearch&Consulting,August22,1992,[USE92]USEŽVersion2.0CodePackageforElastic-PlasticFractureMechanicsAssessmentofNuclearReactorPressureVessels,MPMResearch&Consulting,1992.75 1'PI1