RG1.175 电厂特定风险预知决策的在役试验方法 1998

U.S.NUCLEARREGULATORYCOMMISSIONAugust1998REGULATORYGUIDEOFFICEOFNUCLEARREGULATORYRESEARCHREGULATORYGUIDE1.175(DraftwasIssuedasDG-1062)ANAPPROACHFORPLANT-SPECIFIC,RISK-INFORMEDDECISIONMAKING:INSERVICETESTINGA.INTRODUCTONBackgroundDuringthelastseveralyearsboththeU.S.NuclearRegulatoryCommission(NRC)andthenuclearindustryhaverecognizedthatprobabilisticriskassessment(PRA)hasevolvedtobemoreusefulinsupplementingtraditionalengineeringapproachesinreactorregulation.Afterthepublicationofitspolicystatement(Ref.1)ontheuseofPRAinnuclearregulatoryactivities,theCommissiondirectedtheNRCstafftodeveloparegulatoryframeworkthatincorporatedriskinsights.ThatframeworkwasarticulatedinaNovember27,1995,papertotheCommission(Ref.2).Thisregulatoryguide,whichaddressesinservicetesting(IST)ofpumpsandvalves,anditscompanionregulatorydocuments(Refs.3-8)implement,inpart,theCommissionpolicystatementandthestaff'sframeworkforincorporatingriskinsightsintotheregulationofnuclearpowerplants.TheNRC'spolicystatementonprobabilisticriskanalysisencouragesgreateruseofthisanalysistechniquetoimprovesafetydecisionmakingandimproveregulatoryefficiency.OneactivityunderwayinresponsetothepolicystatementistheuseofPRAinsupportofdecisionstomodifyanindividualplant'sISTprogram.Licensee-initiatedISTprogramchangesthatareconsistentwithcurrentlyapprovedstaffpositions(e.g.,regulatoryguides,standardreviewplans,branchtechnicalpositions)arenormallyevaluatedbytheNRCstaffusingtraditionalengineeringanalyses.Insuchcases,thelicenseewouldnotbeexpectedtosubmitriskinformationinsupportoftheproposedchange.Licensee-initiatedISTprogramchangerequeststhatgobeyondcurrentstaffpositionsmaybeevaluatedbythestaffusingtraditionalengineeringanalysesaswellastherisk-informedapproachsetforthinthisregulatoryguide.Alicenseemayberequestedtosubmitsupplementalriskinformationifsuchinformationisnotprovidedintheproposedrisk-informedinservicetesting(RI-IST)programsubmittedbythelicensee.IfriskinformationontheproposedRI-ISTprogramisnotprovidedtothestaff,thestaffwillreviewtheinformationprovidedbythelicenseetodeterminewhethertheapplicationcanbeapprovedbasedupontheinformationprovidedusingtraditionalmethods,andthestaffwilleitherapproveorrejecttheapplicationbaseduponthereview.Forthoselicensee-initiatedRI-ISTprogramchangesthatalicenseechoosestosupport(orisrequestedbythestafftosupport)withriskinformation,thisregulatoryguidedescribesanacceptablemethodforassessingthenatureandimpactofproposedRI-ISTprogramchangesbyconsideringengineeringissuesandapplyingriskinsights.LicenseessubmittingriskUSNRCREGULATORYGUIDESTheguidesaeIssuedInthefollowingtenbroaddivisions:RegulatoryGuidesaweIssuedtodescribeandmakeavailabletothepublicauchWlormatonasmethodsacceptabletoheNRCstaffforImplementingspecificpartsoftheCom-1.PowerReactors6.Productsmission'sregulations,lechniquesusedbythestaffinevaluatingspecificproblemrorpos-2.ResearchandTestReactors7.Transportationtulatedaccidents,anddataneededbytheNRCstaffinitsreviewofapplicationsforper-3aFuelsandMaterialsFacilities&OccupationalHealthmitsaidlicenss.Regulatoryguidesarenotsubstitutesforregulations,andcomprmence4.EnvironmentalandSting9.AntitrustandFrnancialReviewwiththeminotrequlred.MethodsndsolutMonsdifferentfromho9setoutIntheguidesmaterialsnPlantProtection10LGeneralwilbeacceptableItheyprovideabasisforthefindingsrequisitetotheIssuanceorconUnuanceofapermitorlicensebytheCommission.SinglecopiesofregulatorygoidesmaybeobtainedfreeofchargebywritingtheReproductionandDistributionServicesSection,OfficeoftheChiefInformationOfficer,U.S.NuThisgildswasIsuedafterconsiderationofiommentsracaivedfromthepublic-Corn-dearRegulatoryCommission,Washington,DC20555-0001;orbyfaxat(301)415-2289;menitsendsuggestionslorimprovementshnthesaeguidesareencouragedatalltimes,[e-mail],asappropriate,toaccommodatecommentsandtoreflectnewInationoraipennc.IssuedguidesmayalsobepurchasedfromtheNationalTechnicalInformationServiceonWrittencommertsmaybeaubmittedlotheRulesReviewandDirectivesBranch,ADM,astandingorderbasis.DetailsonthisservicemaybeobtainedbywritingNTIS,5285PortU.S.NuclearRegulaCommission,Washington,DC20555-0001.RoyalRoad,Springfleld,VA22161.informationshouldaddresseachoftheprinciplesofrisk-informedregulationdiscussedinRegulatoryGuide1.174,AnApproachforUsingProbabilisticRiskAssessmentinRisk-InformedDecisionsonPlantSpecificChangestotheLicensingBasis(Ref.3)andrepeatedinthisguide.Licenseesshouldidentifyhowchosenapproachesandmethods(whethertheyarequantitativeorqualitative,traditionalorprobabilistic),data,andcriteriaforconsideringriskareappropriateforthedecisiontobemade.ISTofsnubberswasnotaddressedinthisregulatoryguide,however,licenseesinterestedinimplementingaRI-ISTprogramforsnubbersmaysubmitanalternativetotheNRCforconsideration.RelationshiptotheMaintenanceRule10CFR50.65TheMaintenanceRule,Section50.65,RequirementsforMonitoringtheEffectivenessofMaintenanceatNuclearPowerPlants,of10CFRPart50,DomesticlicensingofProductionandUtilizationFacilities,requiresthatlicenseesmonitortheperformanceorconditionofstructur