RG1.177 电厂特定风险预知决策的技术规格书方法 1998

U.S.NUCLEARREGULATORYCOMMISSIONAugust1998REGULATORYGUIDEOFFICEOFNUCLEARREGULATORYRESEARCHREGULATORYGUIDE1.177(DraftwasIssuedasDG-1065)ANAPPROACHFORPLANT-SPECIFIC,RISK-INFORMEDDECISIONMAKING:TECHNICALSPECIFICATIONSA.INTRODUCTIONTheNRC'spolicystatementonprobabilisticriskanalysis(PRA)(Ref.1)encouragesgreateruseofthisanalysistechniquetoimprovesafetydecisionmakingandimproveregulatoryefficiency.TheNRCstaff'sPRAImplementationPlan(Ref.2)describesactivitiesnowunderwayorplannedtoexpandthisuse.OneactivityunderwayinresponsetothepolicystatementistheuseofPRAinsupportofdecisionstomodifyanindividualplant'stechnicalspecifications(TS).Licensee-initiatedTSchangesthatareconsistentwithcurrentlyapprovedstaffpositions[e.g.,regulatoryguides,standardreviewplans,branchtechnicalpositions,ortheStandardTechnicalSpecifications(STS)(Refs.3-7)]arenormallyevaluatedbythestaffusingtraditionalengineeringanalyses.Alicenseewouldnotbeexpectedtosubmitriskinformationinsupportoftheproposedchange.Licensee-initiatedTSchangerequeststhatgobeyondcurrentstaffpositionsmaybeevaluatedbythestaffusingtraditionalengineeringanalysesaswellastherisk-informedapproachsetforthinthisregulatoryguide.Alicenseemayberequestedtosubmitsupplementalriskinformationifsuchinformationisnotprovidedintheoriginalsubmittalbythelicensee.IfriskinformationontheproposedTSchangeisnotprovidedtothestaff,thestaffwillreviewtheinformationprovidedbythelicenseetodeterminewhethertheapplicationcanbeapprovedbasedupontheinformationprovidedusingtraditionalmethodsandwilleitherapproveorrejecttheapplicationbaseduponthereview.TheguidanceprovidedheredoesnotprecludeotherapproachesforrequestingchangestotheTS.Rather,thisregulatoryguideisintendedtoimproveconsistencyinregulatorydecisionswhentheresultsofriskanalysesareusedtohelpjustifyTSchanges.BackgroundSection182aoftheAtomicEnergyActrequiresthatapplicantsfornuclearpowerplantoperatinglicensesstate:[S]uchtechnicalspecifications,includinginformationoftheamount,kind,andsourceofspecialnuclearmaterialrequired,theplaceoftheuse,thespecificcharacteristicsofthefacility,andsuchotherinformationastheCommissionmay,byruleorregulation,deemnecessaryinordertoenableittofindthattheutilization...ofspecialnuclearmaterialwillbeinaccordwiththecommondefenseandsecurityandwillprovideade-USNRCREGULATORYGUIDESTheguideswreissuedIntfollowingtonbroaddvisions:ReguolatyGuidesamIssuedtodescribeandmakeavailabletothepullicsuchInformaIonasmethodsacceptabletotheNRCstaffforlmplementingpecdflcpersoftheCom-1.PowerReactor.6.Productsmissionregulstons,technmiquesuedbytheItanfievautingepeccproblemsorpos.2.ResearchandTestReactors7.Transportationtuiatedacddents,anddataneededbytheNRCtaffltsrvIewofapplIctforper-3.FuelandMaterialsFadlitiesOccuationalHealthmitsandlcenses.RaguietoryguOdesarenotoulbtitutesforreguiations,andcompliance4,EnvronmentalandSiting9.AnitutandFInancidReviewwlththemIsnorequired.Methodsandsouitorsdifferentfromrthoeesetoutlntheguides&.MaterialaandPlantProtection10.GeneralwillbeacceptableIftheyprovideabasisfortheWidingsrequisitetotheissuarnceorcontnunceofaperfmiorlicensebytheCommission.SinglecopiesofregulatoryguidesmaybeobtainedfreeofchargebywritingtheReproThisgtidewasIssuedalterconsiderationofcommentsreceivedfromtiepbibc.Com-dumionendDistributionServicesSecdMOfficeoftheChiefInformationOfficerUS.NumentsaindsuggestionsforImprovementsIntoseguidesareencouragedateiltimes,anddearRegutlatoryCommission,Washinlgton,DC20555-0001;orbyftxat(301)415-22W,uwiberevised,asappropriate,[e-mail]chasedfromtheNationalTechnicalInformtionServiceonWrittencommentsmaybeeibmlttedtotheRulesReviewandDirectivesBranch.ADM.asttandingorderbasis.DetailsonItisservicemaybeobtainedbywritingNTIS,6285PortU.S.NudearRegulatoryCommission,Washington.DC20M55-0001.RoyalRoad,Springfield,VA22101.quateprotectiontothehealthandsafetyofthepublic.Suchtechnicalspecificationsshallbeapartofanylicenseissued.InSection50.36,TechnicalSpecifications,of10CFRPart50,DomesticLicensingofProductionandUtilizationFacilities,theCommissionestablisheditsregulatoryrequirementsrelatedtothecontentofTS.Indoingthis,theCommissionemphasizedmattersrelatedtothepreventionofaccidentsandthemitigationofaccidentconsequences;theCommissionnotedthatapplicantswereexpectedtoincorporateintotheirTSthoseitemsthataredirectlyrelatedtomaintainingtheintegrityofthephysicalbarriersdesignedtocontainradioactivity(33FR18612)(Ref.8).Pursuantto10CFR50.36,TSarerequiredtocontainitemsinthefollowingfivespecificcategories:(1)safetylimits,limitingsafetysystemsettings,andlimitingcontrolsettings,(2)limitingconditionsforoperation,(3)surveillancerequirements,(4)designfeatures,and(5)administrativecontrols.Sincethemid-1980s,theNRChasbeenreviewingandgrantingimprovementstoTSbased,atleastinpart,onPRAinsights.SomeoftheseimprovementshavebeenproposedbytheNuclearSteamSupplySystem(NSSS)ownersgroupstoapplytoanentireclassofplants.Manyothershavebeenproposedbyindividuallicensees.Typically,theproposedimprovementsinvolve