RG1.196 控制室可居留性 2007

TheU.S.NuclearRegulatoryCommission(NRC)issuesregulatoryguidestodescribeandmakeavailabletothepublicmethodsthattheNRCstaffconsidersacceptableforuseinimplementingspecificpartsoftheagency’sregulations,techniquesthatthestaffusesinevaluatingspecificproblemsorpostulatedaccidents,anddatathatthestaffneedinreviewingapplicationsforpermitsandlicenses.Regulatoryguidesarenotsubstitutesforregulations,andcompliancewiththemisnotrequired.MethodsandsolutionsthatdifferfromthosesetforthinregulatoryguideswillbedeemedacceptableiftheyprovideabasisforthefindingsrequiredfortheissuanceorcontinuanceofapermitorlicensebytheCommission.TheNRCstaffencouragesandwelcomescommentsandsuggestionsinconnectionwithimprovementstopublishedregulatoryguides,aswellasitemsforinclusioninregulatoryguidesthatarecurrentlybeingdeveloped.TheNRCstaffwillreviseexistingguides,asappropriate,toaccommodatecommentsandtoreflectnewinformationorexperience.WrittencommentsmaybesubmittedtotheRulesandDirectivesBranch,OfficeofAdministration,U.S.NuclearRegulatoryCommission,Washington,DC20555-0001.Regulatoryguidesareissuedin10broaddivisions:1,PowerReactors;2,ResearchandTestReactors;3,FuelsandMaterialsFacilities;4,EnvironmentalandSiting;5,MaterialsandPlantProtection;6,Products;7,Transportation;8,OccupationalHealth;9,AntitrustandFinancialReview;and10,General.Requestsforsinglecopiesofdraftoractiveregulatoryguides(whichmaybereproduced)shouldbemadetotheU.S.NuclearRegulatoryCommission,Washington,DC20555,Attention:ReproductionandDistributionServicesSection,orbyfaxto(301)415-2289;[e-mail]ideandotherrecentlyissuedguidesareavailablethroughtheNRC’spublicWebsiteundertheRegulatoryGuidesdocumentcollectionoftheNRC’sElectronicReadingRoomat’sAgencywideDocumentsAccessandManagementSystem(ADAMS)at(NRC)considersacceptableforimplementingtheagency’sregulationsinAppendixA,“GeneralDesignCriteriaforNuclearPowerPlants,”toTitle10,Part50,oftheCodeofFederalRegulations(10CFRPart50),“DomesticLicensingofProductionandUtilizationFacilities,”astheyrelatetocontrolroomhabitability(CRH).Specifically,thisguideoutlinesaprocessthatlicenseesmayapplytocontrolroomsthataremodified,arenewlydesigned,ormusthavetheirconformancetotheregulationsreconfirmed.InAppendixAto10CFRPart50,GeneralDesignCriteria(GDC)1,3,4,5,and19applytoCRH,asfollows:•GDC1,“QualityStandardsandRecords,”requiresthatstructures,systems,andcomponents(SSCs)importanttosafetybedesigned,fabricated,erected,andtestedtoqualitystandardscommensuratewiththeimportanceofthesafetyfunctionsperformed.•GDC3,“FireProtection,”requiresthatSSCsimportanttosafetybedesignedandlocatedtominimizetheeffectsoffiresandexplosions.•GDC4,“EnvironmentalandDynamicEffectsDesignBases,”requiresSSCsimportanttosafetytobedesignedtoaccommodatetheeffectsof,andtobecompatiblewith,theenvironmentalconditionsassociatedwithnormaloperation,maintenance,testing,andpostulatedaccidents,includingloss-of-coolantaccidents(LOCAs).Rev.1ofRG1.196,Page2•GDC5,“SharingofStructures,Systems,andComponents,”requiresthatSSCsimportanttosafetynotbesharedamongnuclearpowerunitsunlessitcanbeshownthatsuchsharingwillnotsignificantlyimpairtheirabilitytoperformtheirsafetyfunctions,including,intheeventofanaccidentinoneunit,theorderlyshutdownandcooldownoftheremainingunits.•GDC19,“ControlRoom,”requiresthatacontrolroombeprovidedfromwhichactionscanbetakentooperatethenuclearreactorsafelyundernormalconditionsandtomaintainthereactorinasafeconditionunderaccidentconditions,includingaLOCA.Adequateradiationprotectionistobeprovidedtopermitaccessandoccupancyofthecontrolroomunderaccidentconditionswithoutpersonnelreceivingradiationexposuresinexcessofspecifiedvalues.SincetheNRCinitiallyissuedRegulatoryGuide1.196inMay2003,thestaffdeterminedthattheinformationpresentedinAppendixBtothatguidedidnotaccuratelyrepresentaviabletechnicalspecificationforCRHatlight-waternuclearpowerreactors.Inparticular,itreferredtofailureofaparticularsurveillanceasaplantstate,ratherthanhavingtheresultsofthesurveillancefactorintotheoperabilitydetermination.Inaddition,itdidnotprovideforadefinitetimetorestorefunctionalitytothecontrolroomenvelope,whereasallimprovedstandardtechnicalspecifications(iSTS)containsuchprovisions.Moreover,AppendixBwasincludedasa“strawman,”tobedeletedwhendetailshadbeenmorecarefullyworkedoutwithindustryparticipation,andthosetechnicalspecificationsplacedintheiSTSwithallotheracceptabletechnicalspecifications.AsofthepublicationdateofthisRevision1ofRegulatoryGuide1.196,noutilityhasbeengrantedthetechnicalspecificationchangesrepresentedbyAppendixBtotheoriginalversionofthisguide.Consequently,theNRCstaffelectedtoremoveAppe