ML17331A613
| ML17331A613 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 11/30/1980 |
| From: | ALLTEN A G, DORSCHU K E, STILWELL T C FRANKLIN INSTITUTE |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17331A610 | List: |
| References | |
| CON-NRC-03-79-118, CON-NRC-3-79-118 TER-C5257-167, TER-C5257-167-168-R1, NUDOCS 8102060575 | |
| Download: ML17331A613 (23) | |
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Enclosure2TECHNICALEVAL'JAT)ONREPORTFRACTURETOUGHNESSOFSTEAMGENER4TORANDREACTORCOOLANTpUMPSUPPORTSINDIANAaHICHIGA')POgt":RCylP@y.DONALDCCOOKNUCLEARPOKERPLANTUNITS1AND2NRCDOCKETNO.$0-315and50-316NRCTACNO.08479and08486NRCCONTRACTNb.NRC43.79'ttbFRCPROJECTCSB7FRCTASK167and168PreparedbyFranklinResearchCenterTheParkwayatTwentiethStreetPhHadelphia,PA19163AuthOrS:T.C.S&lvel',h.G.hllCen,K.E.Dozschu,P.N.NoellFRCGroupLeadei:T.C.ScQ~lLPreparedforNuclearRegulatoryCommissionWashington,D,C.20%5LeadNREngineer:J.R.FairRevision1,Novemberl980ThisreportwaspreparedasanaccountofworksponsoredbyanagencyoftheUnitedStatesGovernment.NeithertheUnitedStatesGovernmentnoranyagencythereof,oranyoftheiremployees,makesanywarranty,expressedorimplied,'orassumesanylegalliabilityorresponsibilityforanythirdparty'suse,ortheresultsofsuchuse,ofanyinformation,apparatus,productorprocessdisclosedlnthisreport,orrepresentsthatitsusebysuchthirdpartywouldnotinfringeprivatelyownedrights,!F'ran}dinResearchCenterADivisionofTheFranklinInstituteThehnjstnnPronount'snowy.Phiii..Pal9I03(2JSi4ib)COO TER-C5257-167/168(Rev.1)CONTENTSSectionTitleParcae1SUMMARY~~t~~~~~~~~~2INTRODUCTION3BACKGROUND~/4CRITERIAAPPLIEDINTHEEVALUATION~4.1Fracture-ToughnessGroupingofMaterialsUsedinSupportConstruction.4.1.1Criterion4.1.2Interpretation.4.2PlantGroupingforFracture-ToughnessRankingofS/GandRCPSupportStructures4.2.1Criterion.4.2.2Interpretation.4.3CriteriaforFracture-ToughnessAdequacyofS/GandRCPSupports.4.3.1NDTCriteriaforScreening.4.3.2Interpretation.4.3.3AlternativeCriteria5TECHNICALEVALUATION5.1ReviewProcedureandImplementationofNRCCriteria775.2ExtentofFRC'sReview.105.3ReviewFindings5.3.1UseofGroupIMaterialsinApplicationsImportanttoStructuralIntegrityofSupports~~~~~~5.3.2ThickSectionUseofGroupIIMaterialsinApplicationsZmportanttoStructuralIntegrity.10,1010 TER-C5257-167/168(Rev.1)5.3.3ThinSectionUseofGroupIIMaterialsinApplicationsImportantToStructuralIntegrity.5.3.4UseofMaterialsClassifiedGroupIIIbyNUREG0577,UponCondition.5.3.5UseofMaterialsClassifiedGroupIIIbyNUREG0577<Outright6CONCLUSIONS101112crumbrTABLETitlePaae51COMPONENTSUPPORTSUMMARY~.~~~~~.8009FranklinResearchCenterAOesicnatTbaFranenhauteiv TER-C5257-167/168(Rev.1)1~SUMMARYInformationconcerningaspectsofthefracture-toughnessdesignofthesteamgenerator(S/G)andreactorcoolantpump(RCP)supportsfortheDonaldC.CookNuclearPowerPlantUnits1and2wassubmittedtotheActingDirectoroftheOfficeofNuclearRegulationbytheIndianaandMichiganPowerCompany(IMPC)byletterdatedNov.23,1977.ThisinformationwasreviewedattheFranklinResearchCenter(FRC)andevaluatedinaccordancewiththecriteriaoftheNuclearRegulatoryCommission(NRC)assetforthinNUREG0577-Draft(henceforthreferredtosimplyasNUREG0577).TheinformationhadpreviouslybeenreviewedaspartofthepreparationofNUREG0577,andD.C.CookUnits1and2hadbeenassignedaGroupZZZ(rela-tivelybest)plantrankingforfracturetoughnessofS/GandRCPsupports.Thisrankingwasregardedastentative.Subsequently,theNRCrequestedFRCtoconductanindependentreviewpriortofinalizingtheranking.sF((C'sreviewwasconfinedtofracture-toughnessissuesinsupportsabovetheembedment.ThereviewwasconductedinaccordancewithNRCcriteriaandtoaprocedurestandardizedfortheseverallicenseeswhosesupportdesignswerereviewedatFRC.Asaresultofitsreview,FRCconfirmedthattheGroupZIIplantrankingassignedtoDonaldC.CookNuclearPowerPlantsUnits1and2forfracturetoughnessofS/GandRCPsupportsisjustifiable.2INTRODUCTIONThisreportprovidesatechnicalevaluationofinformationsuppliedbyIMPCIwithitsletterofNov.23,1977,toMr.EdsonG.Case,ActingDirectorOfficeofNuclearRegulation.Theinformationconcernsthefracture-toughnessdesignofsupportsfortheS/GsandRCPsforD.C.CookUnits1and2.Theobjectiveoftheevaluationistorankthedesignforfracture-toughnessintegrityonarelativescaleinaccordancewiththegroupingschemeandcriteriaestablishedinNUREG0577.0llFranklinResearchCenterAOMsionofTheFlank&~
TER-C5257-167/168(Rev.1)3~BACKGROUNDDuringthecourseoftheNRClicensingreviewfortwopressurizedwaterreactors(PHR),NorthAnnaUnits1and2,questionsvereraisedregardingthefracture-toughnessadequacyofcertainmembersoftheS/GandRCPsupports.Thepotentialforlamellartearinginsomesupportmemberswasalsoquestioned.Thestaff'sconcernintheNorthAnnalicensingprocesswasthatperhapsnotenoughattentionhadbeengiventotheselectionofmaterialsfor,andfabricationof,theS/GandRCPsupports.Fracturetoughnessofamaterialisameasureofitscapabilitytoabsorbenergywithoutfailureordamage.Generally,amaterialisconsidered'tough"when,understatedconditionsofstressandtemperature,thematerialcanwithstandloadingtoitsdesignlimitinthepresenceofflaws.Toughnessalsoimpliesthat,undercertainconditions,thematerialhasthecapabilitytoarrestthegrowthofaflaw.Alackofadequatetoughness(accompaniedbyrthecombinationoflowoperatingtemperature>presenceofflaws>andnonredun-dancyofcriticalsupportmembers)couldresultinrailureofthesupportstructureunderpostulatedaccidentconditionsrspecificallyaloss-of-coolantaccident(LOCA)andsafeshutdownearthquake(SSE).Toaddressfracture-toughnessconcernsattheNorthAnnafacility,thelicenseeundertooktestsnotoriginallyspecifiedandnotincludedintherelevantASSNspecifications.Thesetestsindicatedthatmaterialusedincertainsupportmembershadrelativelypoorfracturetoughnessat804Pmetaltemperature.Inthiscase,thelicenseeagreedtoraise(byancillaryelectricalheat)thetemperatureoftheS/Gsupportbeamsinquestiontoaminimumof2254Feverytime,throughoutthelifeoftheplant,thatthereactorcoolantsystem(RCS)ispressurizedabove1,000psig.TheNRCstafffoundthistobeanacceptableresolution.Becausesimilarmaterialsanddesignswereusedinotherplantsandbe-causesimilarproblemswerethereforepossible,thismattervasincorporatedintotheNRCProgramforResolutionofGenericIssuesas"GenericTechnicalll00FranklinResearchCenterADivisiondIbcFranAnhshu TER-C5257-167/168(Rev.1)ActivityA-12PotentialforLowFractureToughnessandLamellarTearingonPWRSteamGeneratorandReactorCoolantPumpSupports."Sincetheoriginallicensingaction(NorthAnnaUnits1and2)involvedonlytheS/GandRCPsupportsofPWRs,thestaff'sinitialeffortsweredi-rectedtowardexaminationofthecorrespondingsupportsatotherPWRfacili-ties.However,thestaffhaskeptinmindthepossibilityofexpandingitsreviewtoincludeothersupportstructuresinPWRplantsandsupportstruc-turesinboilingwaterreactor(BWR)plants.TheintegrityofsupportembedmentswasnotquestionedduringtheNorthAnnalicensingaction;consequently,emphasiswasplacedonresolvingthemostimmediategenericissue-whetherornotproblemssimilartothoseuncoveredatNorthAnnaexistatotherfacilities.Itwasthestaff'sjudgmentthatinclusionofanevaluationofsupportembedmentsintheinitialreviewwouldrequiredetailed,plant-specificinvestigationsthatwerebeyondthescopeofthepreliminary,overallgenericreview.Suchconsiderationsweredeemedmoresuitecftoasubsequentphasewhenmoredetailedinvestigationsofindividualplantsmightbeundertaken.Requestsforinformationweresenttolicenseesinlate1977;responsestotheserequestswerereceivedduring1978.SandiaLaboratoriesinAlbuquerque,NewMexico,wasretainedtoassistthestaffinthereviewandanalysisoftheinformationreceivedfromlicenseesandapplicants.BasedonanalysisofthisinformationrthetechnicalstudiesperformedbySandiaLaboratories,andreviewoftheissuesbytheNRCstaff,theNRCdevelopedanNRCstafftechnicalpositionontheseissuesrwhichispresentedinNUREG0577,"PotentialforLowFractureToughnessandLamellarTearingonPWRSteamGeneratorandReactorCoolantPumpSupports."Inaddition,NUREG0577establishescriteriaforevaluationofthefracture-toughnessadequacyofS/GandRCPsupports.NUREG0577alsoappliescertainofthesecriteriatothesupportstructuresofanumberofPWRplantstoachieveplantgroupingsaccordingtotherelativefracture-toughnessinte-grityofthesesupports.tillFranklinResearchCenterADivwon81&iFrankhn~
'li TER-C5257-167/168(Rev.1)Theplantratingsare:~GroupI(lowest)eGroupII(intermediate)~GroupIII(highest)Duringthegenericstudy,anumberofPWRplantswerereviewedforthefracture-toughnessadequacyoftheirRCPandS/Gdesigns.Asaresultofthesereviews,eachplantwasassignedatentativeplantrankingofeitherGroupI,II,orIII.SeveralPlants,D.C.CookUnits1and2amongthem,weretentativelyrankedGroupIII.IntheappendixtoNUREG0577preparedbySandiaLabora-tories,whoinitiallyestablishedtherankingswhichsubsequentlyreceivedNRCstaffendorsement,thesignificanceoftheGroupIIIrankingisdescribedas:consideredtobeasgoodascareful,reasonableengineeringpracticecanproduce."However,beforefinalizingthetentativeGroupIIIrankings,theNRCrequestedFRCtoconductanindependentreviewoftheGroupIIIplants(incon~unctionwithsimilarFRCtaskassignmentstoreviewthefracture-toughnessadequacyofcorrespondingsupportsincertainotherplants)andtoprepareaTechnicalEvaluationReportforeachplant,presentingthereviewfindings.ThetechnicalevaluationreportedhereinappliesthecriteriaofNUREG0577totheS/GandRCPsupportsforD.C.CookUnits1and2toprovideanassessmentofthefracture-toughnessadequacyofthesesupportsleadingtoaplantranking.4~CRITERIAAPPLIEDINTHEEVALUATION4~1FRACTURE-%)UGHNESSGROUPINGOFMATERIALSUSEDINSUPPORTCONSTRUCTION4.1.1CriterionTable4.6,MaterialGroups,ofAppendixCtoNUREG0577groupsmaterialsaccordingtotheirrelativefracturetoughnessas:~GroupI(poorest)oGroupII(intermediate)~GroupIII(best)JU~~LFrankjinResearchCenterA~dTheFranklinInseam
TER-C5257-167/168(Rev.1)4.1.2InterpretationIfnosupplementaryrequirementswerecalledoutinthematerialspe'cifi-cationaimedatprocuringaproductwithfracture-toughnesspropertiessupe-riortothoseroutinelysuppliedunderthematerialspecification,thenthematerialwasgroupedinaccordancewithTable4.6.Ifadditionalrequirementsaimedatprocuringaproductwithsuperiorfracture-toughnesspropertieswerespecified,considerationwasgiventocred-/'tingthisspecificmaterialorderwithanimprovedmaterial-grouprating.4~2PLANTGROUPINGFORFRACTURE-TOUGHNESSRANKINGOFS/GANDRCPSUPPORTSTRUCTURES4.2.1CriterionplantsareclassifiedonthebasisoftheconstructionmaterialsusedinI~thesupportsaftergivingconsiderationtotheimportanceoftheirlocationandfunctionwithinthestructure,andtheirconsequentimportancetosupport-structureintegrity.(Refertopages5and.6ofNUREG0577,PartI.)4.2.2Interpretationplantswereassignedaplant-grouprankingidenticaltothematerial-grouprankingoftheleastfracture-toughmaterialusedintheconstruction,pro-videdthisusageisimportanttosupportintegrity.4~3CRITERIAFORFRACTURE-TOUGHNESSADEQUACYOFS/GANDRCPSUPPORTSZtistheclearintentofNUREG0577thatlicenseesdemonstratethefracture-toughnessadequacyoftheS/GandRCpsupportsorthattheytake1appropriatecorrectivemeasurestoassuretheirfracture-toughnessintegrity.NUREG0577providesguidanceforsuchdemonstrations.4.3.1NDTCriteriaforScreening30'FNDT+1~3o+or(F)supports60FI'!IIilFranklinResearchCenterADivaondTheFrabinhsacw TER-C5257-167/168(Rev.1)where:oNDTisthemeannilductilitytransitiontemperatureappro-'riatetothematerialasgivenbyTable4.4ofAppendixCtoNUREG0577'oisthestandarddeviationforthedatausedtodetermineNDTaslistedinTable4.4.0Tsupportsisthelowestmetaltemperaturethatthesupportmemberwilleverexperiencethroughouttheplantlifewhentheplantisinanoperationalstate.Intheabsenceofmeasured,plant-specificdata,Tsupportsistakenas75'F.oThetemperatureterm,30'For60'F,isanallowanceforsec-tionsize(30'Fforthinsectionsand60'Fforthicksec-tions).4.3.2InterpretationIfevidenceisfurnishedbythelicenseeprovingthatothervaluesofNDT,cr,orfareactuallyvalidfortheS/GorRCPsupportsandmateri-supportsalsinthelicensee'splant,suchdatamaybeused..Ifacceptablealternativeevidenceisnotavailable,theabove-stipulatedvaluesshouldbeused.4.3.3AlternativeCriteriaNUREG0577alsorecognizedthatfracture-toughnessintegrityisacomplexmatterinvolvinganumberofinterrelatedfactors,mostofwhichareplantspecific.Consequently,demonstrationofcompliancewiththescreeningcrite-riaisbutonemeansofprovidingsatisfactoryassuranceoffracture-toughnessadequacy.NUREG0577notonlyrecognizesthatothermeansofshowingcompliancewiththeintentofNUREG0577arepossible,butalsooffersextensiveguidancere-latingtoseveralapproachesbywhichsuchademonstrationmaybeachieved.Becauseoftheplant-specificcharacterthatsuchdemonstrationsmusttake,NUREG0577doesnotrestrictthelicenseestoanysingleappro'achbut,instead,encourageseachlicenseetoreviewthefracture-toughnessadequacyofhisS/GandRCPsupportsandsubmitevidenceofhisfindings.I)llFranklinResearchCenterAowoenorHie'r@@dinInNatc n
TER-C5257-167/168(Rev.1)5~TECHNICALEVALUATIONTheinformationfurnishedtotheNRCregardingthefracturetoughnessof,andthepotentialfoxlamellartearingin,S/GandRCPsupportsatD.C.CookUnits1and2wasreviewedatFRC.ThisinformationwassuppliedinresponsetotheNRCstaff'sgenericlettertoPNRlicenseesconcerningtheseissues.Acopyofthestaff'srequest-for-informationletter(ingenericform)maybefoundinNUREG05771AppendixB.OnlyfracturetoughnessissueswereaddressedintheFRCreview;thereviewprocedureisdescribedbelow.5.1REVIEWPROCEDUREANDIMPLEHENTATIONOFNRCCRITERIAThedrawingsandinformationsubmittedwerefirstexaminedtobecome~~familiarwiththestructuraldesign,materialselection,andconstructionpractices.Keyitemsfromthisinformationwerecondensedtotabularformand0arepresentedinTable5.1.InaccordancewithareviewprocedurestandardizedforthelicenseeswhoseplantswereevaluatedatFRC,thefirststepwastocompilealistofmaterialsusedinallmemberssignificanttothestructuralintegrityoftheS/GandRCPsupports.ThelistedmaterialsweretakenfromthyrsereportedintheresponsetoItem1oftheNRC'srequestforinformation>supplementedbyasurveyofthesupportdrawingsforadditionalmaterialswhichmightbeindi-catedthere.Toeachofthematerialssoidentified,twocriteriatestswereapplied:1.TheNDTcriteriaforscreening(paragraph4;3.1ofthisreport).2.ThematerialgrouprankinginaccordancewiththeproceduresofSection4.1.Forplantswhichusedthem,materialswithanassignedGroupIorGroupIIfracture-toughnessratingwerefurthercategorizedasthickorthinusingtheformulashownonthefollowingpagetodeterminethesectionthicknessabovewhichbrittle(plainstrain)behaviormaybeanticipatedunderdynamicload.
IsueTASKSSolCOMPONENTSUPtORTSUHHAkYtLAllflDonaldC.CoolII62Ul'ILITTIndiana6HichlkantonerNESSNeatlngouaeAEAnerleanElectr1<<touerConpenySIITIORT~OT~LIERHAT'LRIALSMAXIHUHALLOUAILEDESIGNSTRESSTIPSHILLCKRTS.NEATAVAILASLEIREAINCNTtRACllliEIOUCN!lCSSTOSTHCMIaANC6ECNUINC(NORMAL)INROIX:NTIIITTORSSCOIIstcuccconHeccrlalalA-6IUCc2A-36A-SSSkoltlnkHatcrlalalA-I&3SlAI'JbC[)AISI414$A-430AISI4340UeldinkHetcrlelelE6UXX~KIOXXSOI6-CI~ROIS-CI~SOIR-C0016C2~SOIRC2~2I/22or3-I(22NiContent~ubarcconeuuablcsTeeIesA36CoflueSralnpractice.Hocus1leadA-5SSInCritlealncubcrs.UTunderucllt'locu-Ihlcbnese~reaskeduccdAreaTesteCVNforA-SIS,A-36,A-5SSII5lt-lba030F).AlsoNAZendHeldHaterlal~Noruel-UpsetlAISCHasIueIAllousblcaKooeckencyl0.9SFaulteflHonl.IncorClastic-plasticAnalysI~0.65SytASRICATIONNKLDIMOtRUCLSSHenualMetalArcSubeccUCLDINC~lOTTOIIRSAISCCode,SectionIXQualifiedtro-'cduccstOSTUKLDINCTRCAIHCHTStcessReliefHKIINNSUSCDTOPRKVKNTLAMELLARICARINCAISCCodeJointsHUEAN>INSPCCTIONS~LRTOROTOUTorRTubccepoaalbleHPorLtULSICNlTPKOFSUl'PORTtinmolunnCODEUSCDLOAD!IKlCONDITIONSNofueloDLUpsctlDl.eTI,+OSEKsoeckencylDLeTLeDSEteulCedlDL+TL~DRCetkOMINIMUMIKMPCRATUkCOFRUPtORT60F(AnblcntCeoperatuceneer~uppocts) cC TER-C5257-167/168(Rev.1)Thecriticalthicknessisgivenby:"ZO225f)eyDwhere:tryDisthedynamicyieldstrengthofthesteel.K~Disthenominal,minimumassuredfracturetoughnessofthesteelinaccordancewithvaluessuppliedbymREG0577.tcisthecriticalthickness.Znmembersthickerthant,brittle(i.e.,planestrain)behaviormaybeexpected.AsimilarcategorizationforgroupZZlmaterialswasnotdeemednecessaryforpurposesofthereviewbecausesuchmaterialsaresanctionedforthick-sectionusebyvirtueoftheirgrouprating.Structuraldrawingswerethenexaminedfor:1.Allstructurallysignificantusesoft;roupImaterials.2.AllstructurallysignificantusesofGroupEImaterialsinthicksections.3.Structurallysignificantapplicationsofmaterialsknowntobesensitivetostresscorrosioncrackingorotherspecialfailuremechanismswhichmightmakethempronetobrittlebehavior.Thecircumstancesassociatedwithsuchusagewerethenexamined.Consider-IIationwasgiventofactorssuchas:directionofloadings(alwayscompressiveorsometimestensile),stresslevelsinthememberasindicatedinthelicensee'sresponse,thepresenceofstressraisersinmembergeometries,re-Idundancyofloadpaths,andthelike.Applicationsjudgedtobeofproblematicfracturetoughnesswereidentifiedformoredetailedevaluationatafuturedate.Xnaddition,informationfurnishedonweldingandonmaterialspecifica-tionswasexaminedforitsfracture-toughnessimplicationsbyaweldingengi-neerandametallurgist,respectively.IllFranklinResearchCenter-9-ADe!sionofTheFanklnInseue fill TERM5257-167/168(Rev.1)AsaresultofthereviewfindingsandinaccordancewiththecriteriaproceduredescribedinSection4.2ofthisreport,atentativeplantrankingforfracture-toughnessadequacyofS/GandRCPsupportswasassigned.52EXTENTOFFRCREVZENFRC'sevaluationswererestrictedtoassessmentsofthefracturetoughnessofsupportsforsteamgeneratorsandreactorcoolantpumps.Assessmentofthefracture-toughnessa'dequacyofsupportsforothercomponentsandoftheembed-mentwasnot:includedinthescopeofFRC'sworkassignmentandwasnotinves-tigated.5~3REVIEWFINDINGS5.3.1UseofGroupIMaterialsinApplicationsImportanttoStructuralIntegrityofSupportsNonefound.5.3.2ThickSectionUseofGroupIZMaterialsinApplicationsZmportanttoStructuralIntegrityNonefound.5.3.3ThinSectionUseofGroupZIMaterialsinApplicationsImportantToStructuralIntegrityAS'IMA-618steelisindicatedonbothS/GandRCPsupportdrawingsasthematerialforthemainverticalcolumns.Theseare.constructedof12inchdia-meter,doubleextra-strongpipe(i.e.,seamlesstubeof123/4incho.d.andwith1inchwalls).NUREG0577classifiesASTMA-618asaGroupZZsteelwhenfurnishedasformedandwithoutadditionalspecificationrequirements.However,AS'IMA-618Grade2wasspecifiedforthistubingandCharpyV-notchtestingwasrequired.SpecificationAS'INA-618Grade2limitssiliconcontenttoamaximumof0.30percent,andrequiresadditionofvanadium.Theactualsteelusedwasanalyzedtohaveonly0.19percentsilicon(sufficienttocompletelydeoxideI)llFranklinResearchCenterADivandTbcFra@OnInane 0
TER-C5257-167/168(Rev.1)thesteelaccordingtosilicon-killedpractice)andtocontain0.04percentvanadium(whichwouldtendtopromoteafinergrainsize).ThetestreportfurnishedintheinformationsuppliedtoNRCbyIMPCindicatedthatthesteelpossessedaCharpyV-notchimpactenergyof24ft-lbsat30'F.Thisvalue,iftypicalofallheats<qualifiesthissteeltobeofadequatequalityandtoughnessfor1inchsectionusage.5.3.4UseofMaterialsClassifiedGroupZZIbyNUREG0577,UponConditionASTMA-588isthemajorcomponentsteelofboththeS/GandRCPsupportsandwassuppliedasA-588>GradeA.ThissteelisclassifiedinNUREG0577asaGroupZImaterialintheas-rolledorhot-workedcondition.However,insections1/2inchthickandover,thesteelwasorderednormalizedandCharpyV-notchimpacttestswererequired.Thetestdatafurnishedforreviewindi-cateadequatetoughnessat30'Finallthicknesses.Inviewoftheadditionalrequirementsspecified,theA-588steelusedinthisapplicationisdeemedtobeof-'sufficientqualityandtoughnesstomeritaGroupZZZmaterialrating.ThetextandmaterialstableoftheZMPCletterofresponserefertouseofASTMA-36steelasamaterialofconstructionforS/GandRCPsupportsintheCookplants.ThesealsostatethatitwasorderedtofinegrainpracticeandrequiredtobesubjectedtoCharpyimpacttesting.WithsuchhdditionalrequirementstheA-36steelwouldbeconsidered,underNUREG0577criteria,assanctionedforgeneraluseinS/GandRCPsupports.However,FRCdidnotfinditindicatedasamaterialofconstructiononanyofthedrawingsfurnishedforreviewnorcouldmilltestorothermaterialdata'forthissteelbefoundamongtheextensiveinformationsupplied.Thus<althoughthereasonforlistingA-36steelasamaterialofconstructionisnotclear;whenoideredtothestatedrequirementsA-36isaGroupZZIsteel,anditsusewouldnotaffectthefinalclassificationofthisplant.5.3.5UseofMaterialsClassifiedGroupIIZbyNUREG0577,OutrightAllboltingandweldingmaterials.!)I)FranklinResearchCenterADhsioncrTheFrank' TER-C5257-167/168(Rev.1)6~CONCLUSIONSThedesignandconstructionofsupportsforsteamgeneratorsandreactorcoolantpumpsatDonaldC.CookNuclearPowerPlantUnits1and2havebeenreviewedforfracture>>toughnessadequacyattheFRC.CriteriaforthesuitabilityofmaterialsandconstructionpracticesforS/GandRCPsupportswereprovidedbytheNRCstaffaspublishedinNUREG0577-Draft.Inthereview,generalcriteriaofNUREG0577werespecificallyappliedtoinformationfurnishedbyIndianaandMichiganPowerCompany(IMPC)concern-ingthesupportsinD.C.CookUnits1and2.Thereviewwasrestrictedtosupports(abovetheembedment)forsteam'eneratorsandreactorcoolantpumps.Conclusionsrelatingtothemdonotnecessarilyextendtothesupportdesignofothercomponents.'I~InthecaseofD.C.CookUnits1and2FRCconcludesthat:l.Engineeringmeasurestakeninsupportdesign,materialselection,materialspecification,materialacceptancetesting,fabricationmethods,andinspectionsprovidereasonableevidencethatthesteamgeneratorsupportstructurespossessadequatefracturetoughnesstomeetNRCcriteriaforaGroupIIIrating.2.EngineeringmeasurestakeninthedesignandconstructionofthereactorcoolantpumpsupportsprovidesimilarevidencetoqualifythemforaGroupIIIratingalso.3.TheGroupIII(relativelyhighest)plantratingforfracture-toughnessadequacyofsupportsassignedtoDonaldCCookNuclearPowerPlantUnits1and2inNUREG0577-Draftisjustifiable.
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