RG1.190 压力容器中子通量的计算与测定方法 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]ideareavailableontheinternetatNRC’shomepageat’shomepage,alongwithotherrecentlyissuedguides,AccessionNumberML010890301.U.S.NUCLEARREGULATORYCOMMISSIONMarch2001REGULATORYGUIDEOFFICEOFNUCLEARREGULATORYRESEARCHREGULATORYGUIDE1.190(PreviousdraftswereDG-1053andDG-1025)CALCULATIONALANDDOSIMETRYMETHODSFORDETERMININGPRESSUREVESSELNEUTRONFLUENCEiiiTABLEOFCONTENTSPageA.INTRODUCTION.............................................................1B.DISCUSSION................................................................2C.REGULATORYPOSITION....................................................31.NEUTRONFLUENCECALCULATIONALMETHODS.............................31.1InputData..............................................................41.2CoreNeutronSource.....................................................61.3FluenceCalculation.......................................................71.4MethodologyQualificationandUncertaintyEstimates...........................152.NEUTRONFLUENCEMEASUREMENTMETHODS...............................212.1MeasurementProcedures..................................................212.2ValidationinStandardandReferenceNeutronFields............................262.3FluenceDeterminationfromDetectorMeasurements............................272.4Ex-vesselDosimetry.....................................................273.REPORTING................................................................283.1FluenceMethods........................................................283.2MultigroupFluences.....................................................283.3IntegralFluences........................................................283.4ComparisonsofCalculationandMeasurement.................................293.5SpecificActivitiesandAverageReactionRates................................29D.IMPLEMENTATION..........................................................29References........................................................................40LISTOFTABLES1.SummaryofRegulatoryPositionsonCalculationandDosimetry........................302.ThresholdDetectorsRecommendedforPressureVesselDosimetry......................34LISTOFFIGURES1.DiscreteOrdinatesCalculationMethodology........................................352.MonteCarloCalculationMethodology............................................363.CalculationMethodologyQualificationProcedure...................................374.FluenceDetermination.........................................................385MeasurementQualificationProcedure.............................................391A.INTRODUCTIONThisregulatoryguidehasbeendevelopedtoprovidestate-of-the-artcalculationsandmeasurementproceduresthatareacceptabletotheNRCstafffordeterminingpressurevesselfluence.TheU.S.NuclearRegulatoryCommission(NRC)haspromulgatedregulationsthatensurethestructuralintegrityofthereactorpressurevesselforlight-water-cooledpowerreactors.Chapter15,“AccidentAnalysis,”oftheStandardReviewPlan(NUREG-0800,“StandardReviewPlanfortheReviewofSafetyAnalysisReportsforNuclearPowerPlants”)assumesthepressurevesseldoesnotfail.SpecificfracturetoughnessrequirementsfornormaloperationandforanticipatedoperationaloccurrencesforpowerreactorsaresetforthinAppendixG,FractureToughnessRequirements,of10CFRPart50,DomesticLicensingofProductionandUtilizationFacilities.TherequirementsofAppendixGareimposedby10CFR50.60.Additionally,inresponsetoconcernsoverpotentialpressurizedthermalshock(PTS)eventsinpressurizedwaterreactors(PWRs),theNRCissued10