GNRO-2017/00027, Entergy Operations Inc. Intent to Submit a License Amendment Request to Implement Tornado Missile Risk Evaluator and Request for Pilot Plant Status

Entergy Operations Inc. Intent to Submit a License Amendment Request to Implement Tornado Missile Risk Evaluator and Request for Pilot Plant Status

ML17116A579
Person / Time
Site:	Grand Gulf
Issue date:	04/26/2017
From:	Larson E A Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2017/00027
Download: ML17116A579 (2)

Text

GNRO-2017/00027April26,2017 U.S.Nuclear Regulatory Commission Attn: DocumentControlDesk Washington,DC20555-0001 Entergy Operations, Inc.P.O.Box756PortGibson,MS39150EricA.LarsonSiteVicePresidentTel.(601)437-7500

DearSirorMadam:

Entergy OperationsInc.Intentto SubmitaLicense AmendmentRequestto Implement TornadoMissileRisk Evaluator and RequestforPilotPlant StatusGrandGulf NuclearStation,Unit1DocketNo.50-416LicenseNo.NPF-29Thisletteristoinformthe Nuclear Regulatory Commission(NRC)ofEntergy Operations Inc.(Entergy)intenttohavetheGrand Gulf NuclearStation(GGNS)Unit1 becomeapilotplantfortheuseofa risk-informed methodologyknownasthe TornadoMissileRisk Evaluator (TMRE).TMREwillbeusedto demonstrate tornado missile protection compliance.Aspartofthepilotprogram,Entergywillsubmitalicense amendmentrequestforapprovaltouseTMREatGGNSUnits1.The Nuclear Energy Institute(NEI)andthe industryhavebeen developinganew methodologytoevaluatetherisk associated with tornadomissileson identified unprotected components.TMREisanew methodologyasdefinedin10CFR50.59,requiringNRCpriorreviewandapprovalona plant-specific basis.Licenseeswouldbeabletosubmitalicense amendmentrequesttouseTMREandtobringthese unprotected components into tornado missile protection complianceifNRC approves the submitted request.ThepurposeofTMREisto presenttheNRCwitha RegulatoryGuide(RG)1.174 risk-informedoptionfor evaluatingtheriskposedby tornadomissilesatanysiteand determine whetheradditionalphysical protection is warranted.TheneedforTMRE originatedwithNRC's issuance of Regulatory Issue Summary(RIS)2015-06,which informed licenseesofseveral instances ofplantsthatwereidentifiedasnotbeingin conformancewiththeir tornadomissilelicensingbasis.

This risk-informed methodologymaybeaplatformforresolvinglowrisk complianceissuesand improve risk-informed regulations.

GNRO-2017/00027Page2of2Entergyrequeststhatthereviewfees associatedwiththeNRC evaluationofthislicense amendmentrequestbewaived pursuantto10CFR170.11onthebasisthattherequestistoassistin developing NRC regulatory guidance to endorse implementationofTMREin accordancewith10CFR170.11(b).Itis Entergy's understandingthatthefee waiverwouldbeapplicabletothe completeNRCreviewofaGGNSlicense amendment request.Thecurrenttargetdateforthis submittalis4th quarter2017.Entergy respectfullyrequestsadecisionontherequestforpilotplantstatusandfee waiverassoonas practicable to supporttimelyand efficient preparationofthelicense amendmentrequest.Thisletter containsnoNRCcommitments.Ifyouhaveany questions, please contactJamesNadeauat 601-437-2103.

Sincerely,EricA.LarsonSiteVice PresidentGrandGulf Nuclear Station EAL/ram cc: U.S.Nuclear Regulatory Commission A TIN:Mr.SivaLingam, NRR/DORL (w/2)MailStopOWFN/8B111555RockvillePikeRockville,MD 20852-2738U.S.Nuclear Regulatory CommissionATTN:Mr.KrissKennedy, NRR/DORL (w/2)MailStopOWFN8B1 Washington,DC20555-0001 NRC Senior Resident InspectorGrandGulf Nuclear StationPortGibson,MS39150