ML23087A210
| ML23087A210 | |
| Person / Time | |
|---|---|
| Issue date: | 03/28/2023 |
| From: | James Shea NRC/NRR/DNRL/NRLB |
| To: | |
| References | |
| Download: ML23087A210 (1) | |
Text
RiskInsightsandSevereAccidentVulnerability InformationforLWRCP Applications DivisionofRiskAssessment,OfficeofNuclearReactor Regulation U.S.NuclearRegulatoryCommission March30,2023
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PurposeofMeeting
- Describe staffsinitiativetodevelopguidance
- Requestfeedback 2
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Background
- Regulations Contentofapplications(10CFR 50.34)
IssuanceofCPs(10CFR 50.35)
- CommissionPolicyStatements SevereReactorAccidentsforFutureDesignsandExistingPlants SafetyGoalsfortheOperationsofNuclearPowerPlants Useof ProbabilisticRiskAssessmentMethodsInNuclearRegulatoryActivities
- Direction ProposedUpdatesofLicensing Policies,Rules,andGuidanceforFutureNew Reactor Applications(SRMSECY20150002)
- Rulemaking Aligning10CFRParts50and52 (ProposedandPending) 3
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ObjectiveofInitiative
- Publishguidanceonscopeofinformationandlevelofdetailforrisk insightsandsevereaccidentinformationsupportingaCPapplication
- FocusonLWRs,includingsmallmodularreactors(SMRs)
- CollaboratewithrelatednonLWRefforts
- Describeriskinsightsandsevereaccidentinformationinsupportof anapplicationcommensuratewith:
- DesignreadinessattimeofCPapplicationsubmission
- Riskinsightsandinformationtosupportstafffindings
- OvercomemisconceptionthatriskinsightsforCPimpliesachieving technicalacceptabilityagainstendorsedPRAStandards
- Determineregulatoryvehicleforguidance 4
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ReasonforStaff'sInitiative
- Someneartermapplicantsstatedpreferenceforutilizing10CFRPart50
- Staffidentifiedgapinregulatoryguidanceforriskinsightsand severe accidentinformationinCPapplications
- NoCPapplicationsfornearly40years
- PastCPapplicationspredatedagencyskeyPRArelatedactions
>> ThreeMileIslandActionPlan
>> GenericLetter8820
>> CommissionsPolicyStatementsonSevereAccidentsandPRA
- GapexistsregardingcontentofCPapplication 5
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BenefitsofRiskInsightsinaCPApplication
- Safetybenefits
- Identifyandfocusdesigneffortsonriskandsafetysignificantitems
- Supportdemonstratingsafetyofdesign
- Focused staffreview
- Leverageriskinsightstofocusonrisksignificantitems
- BenefitdemonstratedinPart52licensingreviews
- ImproveOLapplicationreviews
- Reduced regulatoryrisk
- Increased effectivenessofreview
- FocusstaffattentiononchangescomparedtoCPapplication 6
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StaffsApproach 7
Informationsourcessuchas:
RegulatoryGuide1.70 RegulatoryGuide1.200 StandardReviewPlanforChapter19 DC/COLISG028 DNRLISG22001 Internal deliberations
+
Collaboration withnon LWRefforts Determinenecessary andsufficient informationfor insightstosupport stafffindings Guidance document Staffinitiatedpublic meetings Designspecificpre applicationmeetings
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IssuesUnderDiscussionbyNRCstaff(FeedbackRequested)
- GradedlevelofriskinsightsandsevereaccidentinformationforCP application(§ 50.34(a)).Levelofdetailcommensuratewith:
- MaturityofthedesignatCPstage
- RelianceonPRAinformationfordesignandlicensingdecisions
- FinalityforanySSCsatCPstage
- Treatmentofexternalhazards.
- ProcesstoensurePRAandsevereaccidentinformationcontinuesto reflectchangesbetweenCPandOL.
- TypeandscopeofindependentreviewofCPPRA(esp.forFOAK).
8
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NextSteps
- Continuecommunicationandengagement
- Additionalpublicmeetinglatespring2023
- Encouragedesignspecificpreapplicationengagements
- Identifyregulatorydocumentforguidance
- Draftguidanceforcommentbylatesummerorearlyfallof2023 9
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ListofAbbreviations 10 ADAMS AgencywideDocumentsAccessandManagementSystem CFR CodeofFederalRegulations COL combinedlicense CP constructionpermit DC designcertification FOAK firstofakind FR FederalRegister ISG interimstaffguidance LWR lightwaterreactor SRM staffrequirementsmemorandum SSC structure,system,andcomponent
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ListofReferences SRMSECY20150002ProposedUpdatesofLicensing.Policies,RulesandGuidanceforFutureNew.Reactor Applications,ADAMSML15266A023 NUREG0660,NRCActionPlanDevelopedasaResultoftheTMI2Accident,May1980.
IndividualPlantExaminationforSevereAccidentVulnerabilities 10CFR50.54(f)(GenericLetter No. 88-20),November23,1988 SevereReactorAccidentsRegardingFutureDesignsandExistingPlants;50FR32138,August8,1985 SafetyGoalsfortheOperationsofNuclearPowerPlants; 51FR28044, August4,1986 UseofProbabilisticRiskAssessmentMethodsinNuclearRegulatoryActivities;60FR42622,August16, 1995 RegulatoryGuide1.70,StandardFormatandContentof.SafetyAnalysisReportsforNuclearPowerPlants, Revision3,November,1978 RegulatoryGuide1.200,AcceptabilityofProbabilisticRiskAssessmentResultsforRiskInformedActivities, Revision3,December,2020 NUREG0800,StandardReviewPlanfortheReviewofSafetyAnalysisReportsforNuclearPowerPlants:
LWREdition SevereAccidents.
DC/COLISG028,AssessingtheTechnicalAdequacyoftheAdvancedLightWaterReactorProbabilistic Risk AssessmentfortheDesignCertificationApplicationandCombinedLicenseApplication,December 2016 DNRLISG22001,SafetyReviewofLightWaterPowerReactorConstructionPermitApplications,Interim Staff Guidance, October2022,ML22189A099 11
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12 Questions,Comments,orFeedback