RG1.213 核电厂安全相关电动机控制中心的鉴定 2009

U.S.NUCLEARREGULATORYCOMMISSIONMay2009REGULATORYGUIDEOFFICEOFNUCLEARREGULATORYRESEARCHTheNRCissuesregulatoryguidestodescribeandmakeavailabletothepublicmethodsthattheNRCstaffconsidersacceptableforuseinimplementingspecificpartsoftheagency’sregulations,techniquesthatthestaffusesinevaluatingspecificproblemsorpostulatedaccidents,anddatathatthestaffneedsinreviewingapplicationsforpermitsandlicenses.Regulatoryguidesarenotsubstitutesforregulations,andcompliancewiththemisnotrequired.MethodsandsolutionsthatdifferfromthosesetforthinregulatoryguideswillbedeemedacceptableiftheyprovideabasisforthefindingsrequiredfortheissuanceorcontinuanceofapermitorlicensebytheCommission.Thisguidewasissuedafterconsiderationofcommentsreceivedfromthepublic.Regulatoryguidesareissuedin10broaddivisions—1,PowerReactors;2,ResearchandTestReactors;3,FuelsandMaterialsFacilities;4,EnvironmentalandSiting;5,MaterialsandPlantProtection;6,Products;7,Transportation;8,OccupationalHealth;9,AntitrustandFinancialReview;and10,General.ElectroniccopiesofthisguideandotherrecentlyissuedguidesareavailablethroughtheNRC’spublicWebsiteundertheRegulatoryGuidesdocumentcollectionoftheNRC’sElectronicReadingRoomat’sAgencywideDocumentsAccessandManagementSystem(ADAMS)at(DraftwasissuedasDG-1149,datedJune2008)QUALIFICATIONOFSAFETY-RELATEDMOTORCONTROLCENTERSFORNUCLEARPOWERPLANTSA.INTRODUCTIONThisregulatoryguidedescribesamethodthatthestaffoftheU.S.NuclearRegulatoryCommission(NRC)deemsacceptableforcomplyingwiththeCommission’sregulationsforqualificationofsafety-relatedmotorcontrolcentersfornuclearpowerplants.TheCommission’sregulationsinTitle10,Part50,“DomesticLicensingofProductionandUtilizationFacilities,”oftheCodeofFederalRegulations(10CFRPart50)(Ref.1),requirethatstructures,systems,andcomponentsinanuclearpowerplantthatareimportanttosafetybedesignedtoaccommodatetheeffectsofenvironmentalconditions(i.e.,theymustremainfunctionalunderpostulateddesign-basisevents(DBEs)).Towardthatend,GeneralDesignCriteria1,2,4,and23ofAppendixA,“GeneralDesignCriteriaforNuclearPowerPlants,”to10CFRPart50containthegeneralrequirements.Augmentingthosegeneralrequirementsarethespecificrequirementspertainingtoqualificationofcertainelectricalequipmentimportanttosafetythatappearin10CFR50.49,“EnvironmentalQualificationofElectricEquipmentImportanttoSafetyforNuclearPowerPlants.”Inaddition,CriterionIII,“DesignControl,”ofAppendixB,“QualityAssuranceCriteriaforNuclearPowerPlantsandFuelReprocessingPlants,”to10CFRPart50,requiresthattestprograms,whenusedtoverifytheadequacyofaspecificdesignfeature,shouldincludesuitablequalificationtestingofaprototypeunitunderthemostsevereDBE.Thisregulatoryguidecontainsinformationcollectionsthatarecoveredby10CFRPart50thattheOfficeofManagementandBudget(OMB)approvedunderOMBcontrolnumber3150-0011.TheRG1.213,Page2NRCmayneitherconductnorsponsor,andapersonisnotrequiredtorespondto,aninformationcollectionrequestorrequirementunlesstherequestingdocumentdisplaysacurrentlyvalidOMBcontrolnumber.B.DISCUSSIONTheWorkingGrouponMotorControlCenters(Subcommittee(SC2.14))oftheNuclearPowerEngineeringCommitteeoftheInstituteofElectricalandElectronicsEngineers,Inc.(IEEE)developedStandard6492006,“IEEEStandardforQualifyingClass1EMotorControlCentersforNuclearPowerGeneratingStations.”TheIEEEStandardsAssociationapprovedthisstandardonSeptember15,2006,anditwaspublishedDecember29,2006(Ref.2).Thisstandardprovidesbasicprinciples,requirements,andmethodsforqualifyingsafety-relatedmotorcontrolcentersforapplicationsinbothharshandmildenvironmentsinnuclearpowerplants.Thedemonstrationthataninstalledmotorcontrolcenterwillmeetitsdesignspecificationrequiresmanysteps(aprogramofqualityassurance,design,qualification,productionqualitycontrol,installation,maintenance,periodictesting,andsurveillance).ThescopeofIEEEStandard649-2006islimitedtoqualification.Thepurposeofqualificationistoprovideassurancethatthemotorcontrolcenteriscapableofperformingitsrequiredsafetyfunctionswithnofailuremechanismsthatcouldleadtocommonmodefailuresunderthepostulatedconditionsstatedintheequipmentspecification.Basedonrecentoperatingexperience,theNRCstaffhasconcludedthat:(1)aluminumbusesaremorepronetooxidationthanthecopperbusesinmotorcontrolcenters;and(2)thegroundfaultprotectionformotorcontrolcentersisrecommendedtoreducethedamagetotheelectricalequipmentcausedbyfireinitiatedbyagroundfault.Applicantsandlicenseesshouldgiveappropriateconsiderationstothesefindingswhendesigningmotorcontrolcentersfornewnuclearpowerplants.Clause9.5ofIEEEStandard649-2006referencesIEEEStandard344-2004,“RecommendedPracticeforSeismicQualificationofClass1EEquipmentforNuclearPowerGeneratingStations,”publishedJanuary1,2005(Ref.3),andprovidesadditionalguidanceforseismicqualificationofmotorcontrolcenters.Thevastmajorityofseismicqualificationtestsonmotorcontrolcentersforoperatingplantswereperformedwithinputfrequenciesuptoonly33hertz(Hz).Asaresultofim