RG1.078 主控室可居留性的评价 2001

RegulatoryguidesareissuedtodescribeandmakeavailabletothepublicsuchinformationasmethodsacceptabletotheNRCstaffforimplementingspecificpartsoftheNRC’sregulations,techniquesusedbythestaffinevaluatingspecificproblemsorpostulatedaccidents,anddataneededbytheNRCstaffinitsreviewofapplicationsforpermitsandlicenses.Regulatoryguidesarenotsubstitutesforregulations,andcompliancewiththemisnotrequired.MethodsandsolutionsdifferentfromthosesetoutintheguideswillbeacceptableiftheyprovideabasisforthefindingsrequisitetotheissuanceorcontinuanceofapermitorlicensebytheCommission.Thisguidewasissuedafterconsiderationofcommentsreceivedfromthepublic.Commentsandsuggestionsforimprovementsintheseguidesareencouragedatalltimes,andguideswillberevised,asappropriate,toaccommodatecommentsandtoreflectnewinformationorexperience.WrittencommentsmaybesubmittedtotheRulesandDirectivesBranch,ADM,U.S.NuclearRegulatoryCommission,Washington,DC20555-0001.Regulatoryguidesareissuedintenbroaddivisions:1,PowerReactors;2,ResearchandTestReactors;3,FuelsandMaterialsFacilities;4,EnvironmentalandSiting;5,MaterialsandPlantProtection;6,Products;7,Transportation;8,OccupationalHealth;9,AntitrustandFinancialReview;and10,General.Singlecopiesofregulatoryguides(whichmaybereproduced)maybeobtainedfreeofchargebywritingtheDistributionServicesSection,U.S.NuclearRegulatoryCommission,Washington,DC20555-0001,orbyfaxto(301)415-2289,[e-mail]ide,alongwithotherrecentlyissuedguides,areavailableontheinternetatNRC’shomepage,(DraftwasissuedasDG-1087)EVALUATINGTHEHABITABILITYOFANUCLEARPOWERPLANTCONTROLROOMDURINGAPOSTULATEDHAZARDOUSCHEMICALRELEASEA.INTRODUCTIONCriterion4,EnvironmentalandDynamicEffectsDesignBases,ofAppendixA,GeneralDesignCriteriaforNuclearPowerPlants,to10CFRPart50,DomesticLicensingofProductionandUtilizationFacilities,requires,inpart,thatstructures,systems,andcomponentsimportanttosafetybedesignedtoaccommodatetheeffectsofandtobecompatiblewiththeenvironmentalconditionsassociatedwithnormaloperation,maintenance,testing,andpostulatedaccidents.Criterion19,ControlRoom,requiresthatacontrolroombeprovidedfromwhichactionscanbetakentooperatethenuclearpowerunitsafelyundernormalconditionsandtomaintainitinasafeconditionunderaccidentconditions.Releasesofhazardouschemicalscanresultinthecontrolroombecominguninhabitable.ThisregulatoryguidedescribesassumptionsacceptabletotheNRCstaffforuseinassessingthehabitabilityofthecontrolroomduringandafterapostulatedexternalreleaseofhazardouschemicalsfrommobileorstationarysources,offsiteoronsite.ThisguidealsoprovidesguidanceacceptabletotheNRCstafffortheprotectionofcontrolroomoperatorsagainstanaccidentalreleaseofsuchhazardouschemicals,includingchlorine.RegulatoryGuide1.95,“ProtectionofNuclearPowerPlantControlRoomOperatorsAgainstanAccidentalChlorineRelease,”providedguidanceonstoringchlorineonsite,describedacceptabledesignfeaturesandproceduresfortheprotectionofnuclearpowerplantcontrolroomoperatorsagainstanaccidentalonsitechlorinerelease,andoutlinedemergencyproceduresthatneedtobeinitiatedintheeventofachlorinerelease.1.78-2ThisRevision1ofRegulatoryGuide1.78incorporatesandwithdrawsRegulatoryGuide1.95sincemanyregulatorypositionsinthesetwoguidesarethesameorsimilar.Thisrevisionalsoupdatescertainregulatorypositionsbasedonmorecurrentknowledgeofthesubject.Thisguidedoesnotconsidertheexplosionhazardofthesechemicals,whichisaddressedseparatelyinRegulatoryGuide1.91,“EvaluationsofExplosionsPostulatedToOccuronTransportationRoutesNearNuclearPowerPlants”(Ref.1),nordoesitaddressflammabilityhazards,whichareaddressedseparatelyinRegulatoryGuide1.189,“FireProtectionforOperatingNuclearPowerPlants”(Ref.2).Theinformationcollectionscontainedinthisregulatoryguidearecoveredbytherequirementsof10CFRPart50,whichwereapprovedbytheOfficeofManagementandBudget,approvalnumber3150-0011.IfameansusedtoimposeaninformationcollectiondoesnotdisplayacurrentlyvalidOMBcontrolnumber,theNRCmaynotconductorsponsor,andapersonisnotrequiredtorespondto,theinformationcollection.B.DISCUSSIONThecontrolroomofanuclearpowerplantshouldbeappropriatelyprotectedfromhazardouschemicalsthatmaybedischargedasaresultofequipmentfailures,humanerrors,oreventsandconditionsoutsidethecontrolofthenuclearpowerplant.Sourcesofhazardouschemicalscouldbemobileorstationaryandcouldincludestoragetanks,pipelines,fire-fightingequipment,tanktrucks,railroadcars,andbarges.Thisguidehasbeenrevisedtoprovideguidanceoncontrolroomhabitabilityduringapostulatedhazardouschemicalrelease,includingchlorine.Theguidedescribesassumptionsandcriteriaforscreeningoutreleaseeventsthatneednotbeconsideredintheevaluationofcontrolroomhabitability.Theguidealsoprovidesguidanceonperformingdetailedevaluationsofcontrolroomhabitabilityandonscreeningcriteria,includingthedistancebetweenthereleasesourceandthecontrolroom,thefrequencyofshipment