Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems, Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems: Difference between revisions

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#REDIRECT [[Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems]]
| number = ML003709793
| issue date = 05/16/1997
| title = Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems
| author name =
| author affiliation = NRC/OPA
| addressee name =
| addressee affiliation =
| docket =
| license number =
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| document report number = Press Release-97-079
| document type = Press Release
| page count = 2
| newsletter region = NRC Region Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems
| newsletter year = 20Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems
| newsletter integer = Press Release-97-079, NRC Sends Letters to Sierra Nuclear, Three Utilities on Spent Fuel Storage Cask Welding Problems
}}
 
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{{#Wiki_filter:UnitedStatesNuclearRegulatoryCommissionOfficeofPublicAffairsWashington,DC20555Phone301-415-8200Fax301-415-2234 Internet:opa@nrc.govNo.97-079FORIMMEDIATERELEASE (Friday,May16,1997)NRCSENDSLETTERSTOSIERRANUCLEAR,THREEUTILITIESONSPENTFUELSTORAGECASKWELDINGPROBLEMSTheNuclearRegulatoryCommission'sOfficeofNuclearMaterialSafetyandSafeguardshasissuedConfirmatoryAction LetterstoSierraNuclearCorporation,designeroftheVSC-24dry storagecaskforspentnuclearfuel,andthreeutilitiesthatuse thecaskatpowerplants.ThelettersconfirmthatSierraand theutilitieswilltakecertainactionsregardingwelding problemswiththecasks.TheutilitiesandplantswherethecasksareusedareEntergyOperations,Inc.,operatorofArkansasNuclearOnenear Russellville,Arkansas;ConsumersPowerCo.,operatorofthe PalisadesnuclearpowerplantnearSouthHaven,Michigan;and WisconsinElectricPowerCompany,operatorofthePointBeach nuclearpowerplantnearManitowoc,Wisconsin.SierraNuclearholdsanNRCcertificateapprovingtheuseoftheVSC-24.NRCconductsinspectionstodeterminewhetherthe systemisbeingmanufacturedinaccordancewiththeNRC-certified
 
design.AninspectionconductedtheweekofMarch17atSierraNuclearandtwoofitsfabricationcontractorfacilitiesfocused onproblemspreviouslyfoundinweldsjoiningtheinnercasklid tothecaskwallsinVSC-24unitsatthePalisadesandArkansas plants.Followingthatinspection,problemsarosewhilewelding anotherArkansascask.TheMarchinspectionrevealedthatneitherSierraNuclearnortheutilitylicenseeshadperformedacomprehensiveroot causeanalysisofthefirsttwoweldproblems.Anunderstanding oftherootcauseisessentialtopreventingrecurrencewhen weldingfuturecasks,andassessingthepossibilityofadditional weldproblemsandcracking.OnMay6,NRCheldapublicmeetingwithSierraNucleartodiscussactionstakenandplannedbythecompanyinresponseto theinspectionfindings.Afterthemeeting,theNRCstaff concludedthattherootcauseofthewelddefectshasnotbeenadequatelydetermined.TheNRClettertoSierraNuclearconfirmsthatthecompanywilldeterminetherootcauseofthewelddefects,assessthe potentialfordelayedcrackinginweldsthatattachthetwoouter lidstothecaskwallsinthe19VSC-24caskspresentlyinuse (atArkansas,PalisadesandPointBeach),andevaluate appropriatecorrectiveactionstopreventrecurrenceofweld problems.Aftercompletingtheseactions,thecompanywill submitawrittendescriptionoftheseevaluationstotheNRCby June30.TheNRCletterstothethreeutilitiescurrentlyusingtheVSC-24casksconfirmthat--beforeloadingadditionalVSC-24casks withspentfuel--theywilldeterminethattheirweldingand inspectionpracticesprovidereasonableassurancethatcracking, includingpossibleundetectedordelayedcracking,willnotoccur inthesealweldsbetweenthetwoouterlidsofthecasksystem andthecaskwalls,and,ifnecessary,modifytheirwelding processestoinhibitrecurrenceoftheweldingproblem.After completingthisaction,theutilitieswillsubmittotheNRC,at least14daysbeforeloadinganotherVSC-24caskwithspentfuel, awrittendescriptionofanyproceduralordesignmodifications made,includingatechnicaljustificationforeachmodification.CopiesoftheletterswillbeavailableontheNRCOfficeofPublicAffairshomepageat:http://www.nrc.gov/OPA.
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