ML081430612

Units 1 & 2 - NRC Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-water Reactors Request for Interim.

ML081430612
Person / Time
Site:	Millstone, Kewaunee, Surry, North Anna
Issue date:	05/22/2008
From:	Gerald Bichof Dominion, Dominion Nuclear Connecticut, Dominion Resources Services, Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
08-0275A, NL&OS/GDM R0
Download: ML081430612 (5)

Text

Dominion Resources Services, Inc.

Dominion Boulevard, Glen Allen, VA 2,\0(,()\\'ch Address: www.dom.com May 22, 2008U.S.NuclearRegulatoryCommissionAttention:DocumentControlDeskOneWhiteFlintNorth11555RockvillePikeRockville,MD20852-2738SerialNo.08-0275A NL&OS/GDM RODocketNos.50-305 50-336/423 50-338/339 50-280/281LicenseNos.DPR-43 DPR-65/NPF-49 NPF-4/7 DPR-32/37 DOMINION ENERGYKEWAUNE:E.INC.(DEK)

DOMINION NUCLEAR CONNECTICUT.INC.(DNC)VIRGINIA ELECTRICANDPOWER COMPANY (DOMINION)

KEWAUNEE POWER STATION MILLSTONE POWER STATIONUNITS2AND3 NORTH ANNA AND SURRY PO'NER STATIONUNITS1AND2 NRC GENERIC LETTER(GL)2004-02.

POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCYDURINGDESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS REQUESTFORINTERIM EXTENSION OF COMPLETION DATES FOR CORRECTIVE ACTIONSInaletterdatedNovember15,2007(SerialNo.07-0660),DEK,DNCandDominionsubmittedscheduleextensionrequestsforKewaunee,MillstoneUnits2and3,NorthAnnaUnits1and2andSurryUnits1and2toextendthecompletiondateforcorrectiveactionsassociatedwithGL2004-02.Therequestwasprimarilyforthecompletionofdownstreameffectsevaluationsandchemicaleffectstestingandevaluation.TherequestedextensiondateswereJune30,2008forKewauneeandNovember30,2008forMillstone,NorthAnnaandSurry.InaletterdatedDecember13,2007,theNRCgrantedDEK,DNCandDominionanextensiontoMay31,2008foreachplantcitingtheimportanceofpromptclosureofGL2004-02andthepotentialforscheduleimprovement.

Considerableeffortandresourceshavebeenexpendedtocompletetheoutstandingcorrectiveactionsforeachstationbytheapprovedextensiondate,andsignificantprogresshas beenmadetowardstheresolutionoftheremainingGSI-191issues.However,it hasbecomeevidentthatalloftheremainingcorrectiveactionscannotbecompletedbyMay31,2008.Inaletterdated Serial Number 08-0275ADocketNos.

50-305/336/423/338/339/280/281GL2004-02;Requestfor Extensions Page 2of5May21,2008(SerialNo.

08-0:275),DEK,DNCandDominionrequestedanextensionuntilSeptember30,:2008tocompletetheGL2004-02correctiveactionsforKewaunee,MillstoneUnits2and3,NorthAnnaUnits1and2,andSurryUnits1and2.Therequestedextensionperiodistocompletetheremainingchemicaleffectstestingandevaluationanddownstreameffects analyses.InordertosupportNRCreviewoftheMay21,2008extensionrequestandtheaccompanyingdetailedjustifications,werequestapprovalofaninterimscheduleextensionuntilJune30,2008.Theinterimextensionrequestissupportedbythepreviousextensionrequest basesincludedintheNovember15,2007letter,whichaddressedthethreecriteriacontainedinSECY-06-0078datedMarch31,2006,"CriteriaforEvaluatingDelayofHardwareChanges,"andtheapplicableelementsoftheNRCjustificationforcontinuedoperationinthe"SummaryofJuly26-27,2001MeetingwithNuclearEnergyInstituteandIndustryonECCSStrainerBlockageinPWRs,"datedAugust14,2001foreachplant.ThebasesincludedintheNovember15,2007letterremainvalidandapplicableforthisinterim,short-termextensionrequestandcontinuetoconfirm,thatKewaunee,MillstoneUnits2and3,NorthAnnaUnits1and2,andSurryUnits1and2willcontinuetomeettheircurrentplantlicensingbasesregardingthefunctionandoperabilityofthecontainmentsumpsduringtheperiodoftherequestedextensionsinthat:*TheplantshavecompletedconsiderablephysicalandanalyticalactivitiestoprovideahighlevelofEmergencyCoreCoolingSystem(ECCS)andRecirculationSpray(RS)System(asapplicable)performanceincludingreplacingtheECCSandRSstrainers,*TheplantshaveimplementedmitigativemeasurestominimizetheriskofdegradedECCSandRS(asapplicable)functionsduringtheextensionperiod,and*Theplantshave plant-specilficplanswithmilestonesandschedulestoaddresstheoutstandingtechnicalissueswithsufficientconservatismtoaddressuncertainties.Finally,eventhoughadetailed,quantitativeriskassessmentisnotrequiredforshort-termextensionrequests,theplantriskevaluationsprovidedinourNovember15,2007letterdeterminedthattheriskwas"small"andboundtheriskassociatedwiththeinterimextensionperiodrequestedherein.Therefore,DEK,DNCandDominionhaveestablishedthatthereisreasonableassuranceduringthisrequestedinterimperiodthatKewaunee,MillstoneUnits2 Serial Number 08-0275ADocketNos.

50-305/336/423/338/339/280/281GL2004-02;Requestfor Extensions Page 3of5and3,NorthAnnaUnits1and2,andSurryUnits1and2willprovide acceptable strainerfunctionwithadequatemarginfor uncertainties,asconfirmedinthe NRC's December13,2007letter.Ifyouhaveany questionsorrequireadditionalinformation,please contactMr.GaryD.Millerat(804)273-2771.

Sincerely,GeraldT.Bischof Vice President-Nuclear Engineering Commitmentsmadeinthis correspondence:

None.COMMONWEALTH OF VIRGINIA))COUNTY OF HENRICO)The foregoing document was acknowledgedbeforeme,inandforthe County and Commonwealthaforesaid,todaybyGeraldT.Bischof,whoisVice PresidentNuclear EngineeringofDominionEnergyKewaunee,Inc.,Dominion Nuclear Connecticut,Inc.andVirginiaElectricandPowerCompany.Hehasaffirmedbeforemethatheisdulyauthorizedtoexecuteandfilethe foregoing document in behalf of thosecompanies,andthatthe statementsinthe documentaretruetothebestofhis knowledgeandbelief.

Acknowledgedbeforemethis of,2008.My Commission Expires::.5--3/-10.VICKIL.HULLNotary Public Commonwealth of VIrginia l IllY CommlUlon Explrel May 11.2010NotaryPublic Serial Number 08-0275ADocketNos.

50-305/336/423/338/339/280/281GL2004-02;RequestforExtensionsPage4of5cc:U.S.Nuclear Regulatory CommissionRegionI 475 Allendale RoadKingofPrussia, Pennsylvania 19406-1415 U.S.Nuclear Regulatory CommissionRegionIISamNunnAtlantaFederalCenter61ForsythStreet,SWSuite23T85Atlanta,Georgia30303 U.S.Nuclear Regulatory CommissionRegionIII 2443 Warrenville RoadSuite210Lisle,Illinois 60532-4352 NRC Senior Resident Inspector KewauneePowerStation NRC Senior Resident Inspector MillstonePowerStation NRC SeniorResidentInspectorNorthAnnaPowerStation NRC Senior Resident InspectorSurryPowerStationMs.M.H.Chernoff NRC Project Manager-KewauneeU.S.Nuclear Regulatory Commission One WhiteFlintNorthMailStop 0-8 H4A11555RockvillePikeRockville,Maryland20852*-2738 Serial Number 08-0275ADocketNos.

50-305/336/423/338/339/280/281GL2004-02;RequestforExtensions Page 5 of 5 Mr.J.D.Hughey NRC Project Manager-MillstoneUnits2and3U.S.Nuclear Regulatory Commission One WhiteFlintNorthMailStop 0-8 83 11555 Rockville PikeRockville,MD 20852-2738 cc: (continued)Mr.S.P.Lingam NRC Project Manager-SurryandNorthAnnaU.S.Nuclear Regulatory Commission One WhiteFlintNorthMailStop 0-8 G9A 11555 Rockville PikeRockville,Maryland