ML18312A118

San Onofre Nuclear Generating Station; Presentation for San Onofre Special Inspection Webinar November 8, 2018

ML18312A118
Person / Time
Site:	San Onofre
Issue date:	11/08/2018
From:	NRC Region 4
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Download: ML18312A118 (32)

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San OnofreSpecial Inspection WebinarNovember 8, 2018NRC Region IV, Arlington, TX

~us.NRC United States Nuclear Regulatory Commission Protecting People and the Environnient LogisticsWebinar FormatBack-up Bridge Line(888) 469-1677, Passcode 2471451Questions and Answers 2 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment NRC StaffEric Simpson, Special Inspection Team LeaderRegion IV Fuel Cycle and Decommissioning BranchPatricia Silva, Branch ChiefDivision of Spent Fuel ManagementTroy Pruett, DirectorRegion IV Division of Nuclear Materials Safety 3 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Webinar AgendaBackgroundCanister Downloading OperationsInspection Team FindingsCurrent StatusSummaryQuestions & Answers 4 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment ISFSI Layout5TN NUHOMSDesignHoltecUMAXDesign TransnuclearNUHOMS6 Holtec UMAX7 Vertically Ventilated Module (Vault)8 Spent Fuel Canister 9Holtec MPCTransfer Cask Downloading: Shield Cone10 Downloading: Transporter11 Downloading: Vault Door12 Downloading: Alignment13 Downloading: Attaching Slings14 Downloading: Attaching Slings15 Downloading Preparations16 17What Happened on August 3rd?Low Dose AreaLow Dose Area What Happened on August 3rd?18 What Happened on August 3rd?19 What Happened on August 3rd?20 21What Happened on August 3rd?

Post Event ActionsSpent Fuel Handling Activities SuspendedNRC Inspection ActivitiesSan Onofre Notification to NRCCausal EvaluationsCorrective Actions 22 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Spent Fuel Handling Activities Suspended 23MPC 29 lowered into vaultSan Onofre suspends fuel loadingMPC 30 Inside Transfer CaskSeismically Restrained in Fuel Building US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment NRC Inspection Activities 24August 6 th: NRC Region IV informally notified of Misalignment Event and initiates daily oversight communicationsAugust 7 th: San Onofrecommits to NRC review before resuming operationsAugust 17 th: NRC decides to conduct Special InspectionSeptember 10

-14: NRC Special Inspection Team onsiteNRC to perform inspection prior to resumption of fuel loading US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment NRC Inspection Activities 252 Preliminary Escalated Findings Failure to provide redundant drop protectionFailure to report 3 Preliminary Severity Level IV ViolationsProceduresCorrective actionsTrainingManagement Oversight Weaknesses US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Causal Evaluations 26San OnofreApparent Cause EvaluationHoltec Root Cause AnalysisCommon Cause Evaluation US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Root CausesSan Onofre Management failed to provideAdequate procedures Adequate training to support procedureAdequate oversight 27 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Corrective ActionsTraining RequirementsProcedure EnhancementsEquipment EnhancementsOversight Improvements 28 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Event SignificanceNo Actual Drop of CanisterNo Radiological ReleaseLoad Drop Analysis (if canister fell) 29 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Next StepsIssue NRC Inspection ReportNRC Inspection of Causal AnalysesNRC Inspection of Corrective Actions 30 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment SummaryCould have been preventedWeaknesses in management oversightMultiple failed barriersIncreased NRC oversight 31 US.NRC United States Nuclear Regulatory Commission Protecting People and the Environment Questions32