ML090150579

North Anna, Unit 2 Supplemental Response to NRC Generic Letter 2008-01, Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems - Inaccessible Areas

ML090150579
Person / Time
Site:	North Anna
Issue date:	01/15/2009
From:	Matthews W R Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
08-0013F, GL-08-001
Download: ML090150579 (6)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261January15,2009U.S.NuclearRegulatoryCommissionAttention:DocumentControlDeskOneWhiteFlintNorth11555RockvillePikeRockville,MD20852-2738SerialNo.NLOS/ETSDocketNo.LicenseNo.

08-0013F RO 50-339 NPF-7 VIRGINIA ELECTRICANDPOWER COMPANY (DOMINION)

NORTH ANNA POWER STATIONUNIT2 SUPPLEMENTAL RESPONSETONRC GENERIC LETTER 2008-01, MANAGING GAS ACCUMULATION IN EMERGENCY CORE COOLING, DECAY HEAT REMOVAL, AND CONTAINMENT SPRAY SYSTEMS-INACCESSIBLE AREASTheNuclearRegulatoryCommission(NRC)issuedGenericLetter(GL)2008-01on January11,2008,torequestthateachlicenseeevaluatethelicensingbasis,design,testing,andcorrectiveactionprogramsfortheEmergencyCoreCoolingSystems(ECCS),ResidualHeatRemoval(RHR)System,andContainmentSpray(CS)Systemtoensurethatgasaccumulationismaintainedlessthantheamountthatcouldchallengeoperabilityofthesesystems,andthatappropriateactionistakenwhenconditionsadversetoqualityareidentified.InanOctober14,2008letter(SerialNo.08-0013B),DominionprovidedtheinformationrequestedinGL 2008-01forSurryandNorthAnnaPowerStations.However,asidentifiedinourMay7,2008letter(SerialNo.08-0013A),Dominionprovidedanalternatescheduleforthecompletionofthewalkdownsand evaluationsoftheinaccessibleportionsoftheECCSandSpraySystemsinsidecontainment.Specifically,DominioncommittedtoprovidethisinformationbyJanuary15,2009forNorthAnnaUnit2andJuly15,2009forNorthAnnaUnit1.TheNRCapprovedthecompletionschedulevialetterdatedJuly23,2008.Insummary,Dominionhasconcludedthat:1)theECCS,RHRand containment spraysystemsatNorthAnnaPowerStationUnit2areincompliancewiththeirTSdefinitionsofoperability,i.e.,capableofperformingtheirintendedsafetyfunctions,and2)NorthAnnaPowerStationisincompliancewith10CFR50,AppendixB,CriterionIII,V,XI,XVI,andXVII,withrespecttotheconcernsoutlinedinGL2008-01regardinggasaccumulationintheapplicablesystems.

SerialNo.08-0013FDocketNo.50-339Page2of3Theattachmenttothisletterprovidestheresultsofthewalkdownand evaluationsoftheinaccessibleportionoftheECCSinsidecontainmentforNorthAnnaPowerStationUnit2.PleasecontactMr.ThomasShaubat(804)273-2763ifyouhaveany questions orrequireadditionalinformation.

Sincerely,WilliamR.MatthewsSeniorVicePresident-NuclearOperations COMMONWEALTHOFVIRGINIAVICKIL.HULL Notary Public l Commonwealth of VirginiaMy Commission Expires May31.2010-----------------COUNTYOFHENRICOTheforegoingdocumentwasacknowledgedbeforeme,inandfortheCountyand Commonwealthaforesaid,todaybyWilliam R.Matthews,whoisSeniorVicePresident-Nuclear OperationsofVirginiaElectricandPowerCompany.Hehasaffirmedbeforemethatheisdulyauthorizedtoexecuteandfilethe foregoing documentinbehalfofthatcompany,andthatthestatementsinthedocumentaretruetothebestofhisknowledqeandbelief.

/J Acknowledgedbeforemethis

/5??'day of 11 1iM/M2009.MyCommissionExpires::3 J I dOlONotaryPublicCommitmentsmadeinthisletter:None

Attachment:

SupplementalResponsetoGL 2008-01-NorthAnnaPowerStationUnit2 cc:U.S.NuclearRegulatoryCommissionRegionIISamNunn AtlantaFederalCenter 61ForsythStreet,S.W.,Suite23T85Atlanta,GA30303-8931 NRC SeniorResidentInspectorNorthAnnaPowerStationMr.J.E.Reasor,Jr.OldDominionElectricCooperative InnsbrookCorporateCenter4201DominionBlvd.Suite300GlenAllen,Virginia23060Mr.J.F.Stang,Jr.NRCProjectManagerU.S.NuclearRegulatoryCommissionOneWhiteFlintNorthMaiIStop 08-G9A11555RockvillePikeRockville,MD20852-2738Ms.D.N.WrightNRCProjectManagerU.S.NuclearRegulatoryCommissionOneWhiteFlintNorthMailStop 08-H4A11555RockvillePikeRockville,MD20852-2738SerialNo.08-0013FDocketNo.50-339Page3of3 ATTACHMENT NORTHANNAPOWER STATIONUNIT2 SUPPLEMENTAL RESPONSETOGL2008-01 VIRGINIA ELECTRICANDPOWER COMPANY (DOMINION)SerialNo.08-0013FDocketNo.50-339 SerialNo.08-0013FDocketNo.50-339Page1of2NorthAnnaUnit2Nine-MonthSupplementalResponsetoNRCGenericLetter2008-01Thisattachmentprovidesthenine-monthSupplementalResponsetoGenericLetter 2008-01foractionsthatweredeferreduntilthenextrefuelingoutageforNorthAnnaUnit2asrequestedbyDominioninaMay8,2008letter(SerialNo.08-0013A)andapprovedbytheNRGinaJuly23,2008letter.TheoriginalconclusionsdocumentedinNorthAnnaUnits1and2nine-monthresponsewithrespecttothelicensingbasisevaluation,testingevaluations,andcorrectiveactionevaluationshavenotchangedforNorthAnnaUnit2.ThissupplementprovidestheresultsofdesignevaluationreviewsconductedduringtherecentUnit2refuelingoutageassociatedwithwalkdownsofpreviouslyuncompleted activities.A.EVALUATIONRESULTS1.DesignBasisDocumentsNochangestolicensingordesignbasishavebeenidentifiedasaresultoftheconfirmatoryinspectionorwalkdownsperformedduringtheNorthAnnaUnit2refuelingoutage.

2.Confirmatory Walkdownsa.TheLowHeadSafetyInjectioncoldlegpipinginsidecontainmentwaslaserscannedanddetailedisometricsprepared.Aslopereportwasdevelopedtoidentifyhighpointsinthepiping.Eachidentifiedhighpointofgreaterthan1degreewasevaluatedforpotentialgasaccumulation.Theevaluatedhighpointsdidnotexceedpreviouslydeterminedacceptancecriteriadevelopedforthisdischargepiping.b.Ventingwasperformedatthesystempipinghighpointsoutsideofcontainmentinaccordancewithexistingstationproceduresforeach EGGSsystempipingtrainuponreturntoservice.Subsequentfullflowtestingandsystemflowsweepingwasperformedinaccordancewithexistingstationprocedurestoperformdynamicventingofthesystempipinghighpointsbothoutsideandinsideofcontainmentforeach EGGSsystempipingtrain.3.VentValvesNonewventvalvelocationsormodificationstoexistingventvalveshavebeenidentifiedbytheconfirmatoryinspectionorwalkdown.

SerialNo.08-0013FDocketNo.50-339Page2of2 4.ProceduresNoprocedurerevisionshavebeenidentifiedbytheconfirmatoryinspectionor walkdown.B.DESCRIPTION OF NECESSARY ADDITIONAL CORRECTIVE ACTIONS 1.Additional Corrective ActionsNoadditionalcorrectiveactionsarerequiredasaresultoftheconfirmatoryinspectionorwalkdown.

2.Corrective Action UpdatesNochangeshavebeenmadetothepreviouscorrectiveactionsidentifiedinSectionCofAttachment2toDominion'sOctober14,2008letter(SerialNo.

08-00138).

ConclusionDominionhasevaluatedthepreviouslyunevaluatedportionsoftheapplicablesystemsatNorthAnnaUnit2thatperformthefunctionsdescribedintheGenericLetter2008-01andhasconcludedthatthesesystemsareoperable.TheoriginalconclusionsdocumentedinDominion'sresponsedatedOctober14,2008withrespecttothelicensingbasisevaluation,testingevaluations,andcorrectiveactionevaluationshavenotchanged.