Designation:C1562−10StandardGuideforEvaluationofMaterialsUsedinExtendedServiceofInterimSpentNuclearFuelDryStorageSystems1ThisstandardisissuedunderthefixeddesignationC1562;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Partofthetotalinventoryofcommercialspentnuclearfuel(SNF)isstoredindrycaskstoragesystems(DCSS)underlicensesgrantedbytheU.S.NuclearRegulatoryCommission(NRC).Thepurposeofthisguideistoprovideinformationtoassistinsupportingtherenewaloftheselicenses,safelyandwithoutremovaloftheSNFfromitslicensedconfinement,forperiodsbeyondthosegovernedbythetermoftheoriginallicense.Thisguideprovidesinformationonmaterialsbehaviorunderconditionsthatmaybeimportanttosafetyevaluationsfortheextendedserviceoftherenewalperiod.ThisguideiswrittenforDCSScontaininglightwaterreactor(LWR)fuelthatiscladinzirconiumalloymaterialandstoredinaccor-dancewiththeCodeofFederalRegulations(CFR),atanindependentspent-fuelstorageinstallation(ISFSI).2Thecom-ponentsofanISFSI,addressedinthisdocument,includethecommercialSNF,canister,cask,andallpartsofthestorageinstallationincludingtheISFSIpad.Thelanguageofthisguideisbased,inpart,ontherequirementsforadrySNFstoragelicensethatisgranted,bytheU.S.NuclearRegulatoryCom-mission(NRC),forupto20years.Althoughgovernmentregulationsmaydifferforvariousnations,theguidanceonmaterialspropertiesandbehaviorgivenhereisexpectedtohavebroadapplicability.1.2Thisguideaddressesmanyofthefactorsaffectingthetime-dependentbehaviorofmaterialsunderISFSIservice[10CFRPart72.42].Thesefactorsarethoseregardedtobeimportanttoperformance,inlicenseextension,beyondthecurrentlylicensed20-yearperiod.ExamplesofthesefactorsaregiveninthisguideandtheyincludematerialsalterationsorenvironmentalconditionsforcomponentsofanISFSIsystemthat,overtime,couldhavesignificancerelatedtosafety.Forpurp...
