RG1.026 质量组分级及其标准 2007

IneditionsoftheASMEBoilerandPressureVesselCodepublishedbefore1971,SectionIIIusesthetermsClassA,1ClassB,andClassCinlieuofClass1,Class2,andClass3.TheU.S.NuclearRegulatoryCommission(NRC)issuesregulatoryguidestodescribeandmakeavailabletothepublicmethodsthattheNRCstaffconsidersacceptableforuseinimplementingspecificpartsoftheagency’sregulations,techniquesthatthestaffusesinevaluatingspecificproblemsorpostulatedaccidents,anddatathatthestaffneedinreviewingapplicationsforpermitsandlicenses.Regulatoryguidesarenotsubstitutesforregulations,andcompliancewiththemisnotrequired.MethodsandsolutionsthatdifferfromthosesetforthinregulatoryguideswillbedeemedacceptableiftheyprovideabasisforthefindingsrequiredfortheissuanceorcontinuanceofapermitorlicensebytheCommission.Thisguidewasissuedafterconsiderationofcommentsreceivedfromthepublic.TheNRCstaffencouragesandwelcomescommentsandsuggestionsinconnectionwithimprovementstopublishedregulatoryguides,aswellasitemsforinclusioninregulatoryguidesthatarecurrentlybeingdeveloped.TheNRCstaffwillreviseexistingguides,asappropriate,toaccommodatecommentsandtoreflectnewinformationorexperience.WrittencommentsmaybesubmittedtotheRulesandDirectivesBranch,OfficeofAdministration,U.S.NuclearRegulatoryCommission,Washington,DC20555-0001.Regulatoryguidesareissuedin10broaddivisions:1,PowerReactors;2,ResearchandTestReactors;3,FuelsandMaterialsFacilities;4,EnvironmentalandSiting;5,MaterialsandPlantProtection;6,Products;7,Transportation;8,OccupationalHealth;9,AntitrustandFinancialReview;and10,General.Requestsforsinglecopiesofdraftoractiveregulatoryguides(whichmaybereproduced)shouldbemadetotheU.S.NuclearRegulatoryCommission,Washington,DC20555,Attention:ReproductionandDistributionServicesSection,orbyfaxto(301)415-2289;[e-mail]ideandotherrecentlyissuedguidesareavailablethroughtheNRC’spublicWebsiteundertheRegulatoryGuidesdocumentcollectionoftheNRC’sElectronicReadingRoomat’sAgencywideDocumentsAccessandManagementSystem(ADAMS)at(DraftwasissuedasDG-1152,datedNovember2006)QUALITYGROUPCLASSIFICATIONSANDSTANDARDSFORWATER-,STEAM-,ANDRADIOACTIVE-WASTE-CONTAININGCOMPONENTSOFNUCLEARPOWERPLANTSA.INTRODUCTIONGeneralDesignCriterion1,“QualityStandardsandRecords,”assetforthinAppendixA,“GeneralDesignCriteriaforNuclearPowerPlants,”toTitle10,Part50,oftheCodeofFederalRegulations(10CFRPart50),“LicensingofProductionandUtilizationFacilities”(Ref.1),requiresthatstructures,systems,andcomponentsimportanttosafetybedesigned,fabricated,erected,andtestedtoqualitystandardscommensuratewiththeimportanceofthesafetyfunctionstobeperformed.Under10CFR50.55a,“CodesandStandards,”certainsystemsandcomponentsofboiling-andpressurized-water-coolednuclearpowerreactorsmustbedesigned,fabricated,erected,andtestedinaccordancewiththestandardsforClass1,2,and3componentsgiveninSectionIII,“NuclearPower1PlantComponents,”oftheAmericanSocietyofMechanicalEngineers(ASME)BoilerandPressureVesselCode(Ref.2)orequivalentqualitystandards.ThisguidedescribesaqualityclassificationsystemrelatedtospecifiednationalstandardsthatmaybeusedtodeterminequalitystandardsacceptabletothestaffoftheU.S.NuclearRegulatoryCommission(NRC)forsatisfyingGeneralDesignCriterion1forothersafety-relatedcomponentscontainingwater,steam,orradioactivematerialinlight-water-coolednuclearpowerplants.RegulatoryGuide1.143,“DesignGuidanceforRadioactiveWasteManagementSystems,Structures,andComponents2InstalledinLight-Water-CooledNuclearPowerPlants”(Ref.4),providesspecificguidanceontheclassificationofradioactivewastemanagementsystems.Rev.4ofRG1.26,Page2Thisregulatoryguidecontainsinformationcollectionsthatarecoveredbytherequirementsof10CFRPart50whichtheOfficeofManagementandBudget(OMB)approvedunderOMBcontrolnumber3150-0011.TheNRCmayneitherconductnorsponsor,andapersonisnotrequiredtorespondto,aninformationcollectionrequestorrequirementunlesstherequestingdocumentdisplaysacurrentlyvalidOMBcontrolnumber.B.DISCUSSIONIntheearly1970s,theNRCstaffdevelopedaqualityclassificationsystemtoprovidelicenseeswithguidanceforsatisfyingGeneralDesignCriterion1.Thesystemconsistsoffourqualitygroups,AthroughD;methodsforassigningcomponentstothosequalitygroups;andspecificqualitystandardsappliedtoeachqualitygroup.WhentheNRCissuedRevision2ofthisguideinJune1975andDraftRevision3forpubliccommentinFebruary1976,10CFR50.55arequiredonlythatcomponentsofthereactorcoolantpressureboundarybedesigned,fabricated,erected,andtestedtothehighestavailablenationalstandards;thiscorrespondedtothequalitystandardsforQualityGroupAoftheNRCsystem.OnMarch15,1984,theCommissionpublishedafinalrule(Ref.3)amending10CFR50.55atoincorporatebyreferencethecriteriainSectionIIIoftheASMECode,astheyrelatetothedesignandfabricationofClass2and3components(QualityGroupBandCcomponents,respectively).Becausethequ