搜索
U.S.NUCLEARREGULATORYCOMMISSIONRevision10June11184REGULATORYGUIDE4**OFFICEOFNUCLEARREGULATORYRESEARCHREGULATORYGUIDE1.89(TaskEE042-2)ENVIRONMENTALQUALIFICATIONOFCERTAINELECTRICEQUIPMENTIMPORTANTTOSAFETYFORNUCLEARPOWERPLANTSA.INTRODUCTIONTheCommission'sregulationsin10CFRPart50,DomesticLicensingofProductionandUtilizationFacilities,requirethatstructures,systems,andcomponentsimportanttosafetyinanuclearpowerplantbedesignedtoaccommodatetheeffectsofenvironmentalconditions(ie.,remainfunctionalunderpostulatedaccidentconditions)andthatdesigncontrolmeasuressuchastestingbeusedtochecktheadequacyofdesign.ThesegeneralrequirementsarecontainedinGeneralDesignCriteria1,2,4,and23ofAppendixA,GeneralDesignCriteriaforNuclearPowerPlants,toPart50;inCriterionIII,DesignControl,CriterionXI,TestControl,andCriterionXVII,QualityAssuranceRecords,ofAppendixB,QualityAssuranceCriteriaforNuclearPowerPlants-andFuelReprocessingPlants,toPart50;andin§50.55a.Specificrequirementspertainingtoqualificationofcertainelectricequipmentimportanttosafetyarecontainedin§50.49,EnvironmentalQualificationofElectricEquipmentImportanttoSafetyforNuclearPowerPlants,of10CFRPart50.Section50.49requiresthatthreecategoriesofelectricequipmentimportanttosafetybequalifiedfortheirapplicationandspecifiedperformanceandprovidesrequirementsforestablishingenvironmentalqualificationmethodsandqualificationparameters.Thesethreecategoriesare(1)safety-relatedelectricequipment(ClasslE),(2)non-safety-relatedelectricequipment(non-ClasslE)whosefailureunderpostulatedenvironmentalconditionscouldpreventsatisfactoryaccomplishmentofsafetyfunctionsbysafety-relatedequipment,and(3)certainpostaccidentmonitoringequipment.Thisregulatoryguideappliesonlytothesethreecategoriesofelectricequipmentimportanttosafety.*Thesubstantialnumberofchangesinthisrevisionhasmadeitimpracticaltoindicatethechangeswithlinesinthemargin.USNRCREGULATORYGUIDEStegulatoryGuidesareissuedtodescribeandmakeavailabletothe,ublicmethodsacceptabletotheNRCstaffofimplementingpecificpartsoftheCommission'sregulations,todelineatetechIquesusedbythestaffInevaluatingspecificproblemsorpostuitedaccidents,ortoprovideguidancetoapplicants.RegulatoryWuidesarenotsubstitutesforregulations,andcompliancewithnemisnotrequired.MethodsandsolutionsdifferentfromthosesetutIntheguideswillbeacceptableiftheyprovideabasisfortheindingsrequisitetotheissuanceorcontinuanceofapermitorcensebytheCommission.'hisguidewasissuedafterconsiderationofcommentsreceivedfromiepublic.CommentsandsuggestionsforimprovementsintheseAdidesareencouragedatalltimes,andguideswillberevised,asloropriate,toaccommodatecommentsandtoreflectnewinformaonorexperience.Section50.49doesnotincluderequirementsforseismicanddynamicqualification,protectionofelectricequipmentagainstothernaturalphenomenaandexternalevents,andequipmentlocatedinamildenvironmentThisregulatoryguidedescribesamethodacceptabletotheNRCstaffforcomplyingwith§50.49of10CFRPart50withregardtoqualificationofelectricequipmentimportanttosafetyforserviceinnuclearpowerplantstoensurethattheequipmentcanperformitssafetyfunctionduringandafteradesignbasisaccident.TheAdvisoryCommitteeonReactorSafeguardshasbeenconsultedconcerningthisguideandhasconcurredintheregulatoryposition.AnyguidanceinthisdocumentrelatedtoinformationcollectionactivitieshasbeenclearedunderOMBClearanceNo.3150-0011.B.DISCUSSIONIEEEStd323-1974,IEEEStandardforQualifyingClassIEEquipmentforNuclearPowerGeneratingStations,1publishedFebruary28,1974,waspreparedbySubcommittee2,EquipmentQualification,oftheNuclearPowerEngineeringCommitteeoftheInstituteofElectricalandElectronicsEngineers(IEEE)andwasapprovedbytheIEEEStandardsBoardonDecember13,1973.ThestandarddescribesbasicproceduresforqualifyingClass1Eequipmentandinterfacesthataretobeusedinnuclearpowerplants,includingcomponentsorequipmentofanyinterfacewhosefailurecouldadverselyaffectanyCassIEequipment.Forthepurposesofthisguide,qualificationisaverificationofdesignlimitedtodemonstratingthattheelectricequipmentiscapableofperformingitssafety1CopiesmaybeobtainedfromtheInstituteofEwetrimlandlectromcsEaginems,Inc.,34SFast47thStreet,NewYork,NewYork10017.CommentsshouldbeSenttotheSecretaryoftheCommission,U.S.NuclearRegulatoryCommission,Washington,D.C.20555,Attention:DocketingandServiceBranch.Theguidesareissuedinthefollowingtenbroaddivisions:1.PowerReactors6.Products2.ResearchandTestReactors7.TransPortation3.FuelsandMaterialsFacilities8.OccupationalHealth4.EnvironmentalandSiting9.AntitrustandFinancialReview5.MaterialsandPlantProtection10.GeneralCopiesofissuedguidesmaybepurchasedatthecurrentGovernmentPrintingOffice-price.AsubscriptionserviceforfutureguidesinspecificdivisionsIsavailablethroughtheGovernmentPrintingOffice.InformationonthesubscriptionserviceandcurrentGPOpricesmaybeobtainedbywritingtheU.S.NuclearRegulatoryCommission,Washington,D.C.20555,Attention:PublicationsSalesManager.functionundersignificantenvironmentalstressesresultingfromdesignbasisaccidentsinordertoavoidcommoncausefailures.Paragraph50.49(eX5)callsforequipmentqualifiedbytesttobepreconditione