ML091250357

Fourth Interval ISI Program, Response to Request for Information Regarding NDE-005

ML091250357
Person / Time
Site:	North Anna
Issue date:	05/04/2009
From:	Price J A Dominion, Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
09-265
Download: ML091250357 (5)

Text

10CFR50.55a VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 Kay 4, 2009 u.s.NuclearRegulatoryCommissionAttention:DocumentControlDeskWashington,D.C.20555SerialNo.NL&OS/ETSDocketNo.LicenseNo.09-265 RO 50-338 NPF-4 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)

NORTH ANNA POWER STATIONUNIT1 FOURTH INTERVAL lSI PROGRAM RESPONSE TO REQUEST FOR INFORMATION REGARDING NDE-OOSInaletterdatedOctober17,2008(SerialNo.08-0595),DominionsubmittedtheNorthAnnaPowerStationUnit1inserviceinspection(lSI)programforthefourthinserviceinspection(lSI)intervalapplicabletoClass1,2,and3componentsandcomponentsupports.ThelSIPlandescribedtheprogrammaticaspectsoflSI examinationsofcomponentsandcomponentsupports.Includedwiththeprogramwererequestsforalternativesorrelieffromthespecificcoderequirementsinaccordancewith10CFR50.55a(a)(3)(i)and/or(ii)or10CFR50.55a(g)(5)(iii).InanApril15,2009lettertheNRCstaffrequestedadditionalinformationregardingreliefrequestNDE-005tocompletetheirreview.The attachment tothisletterprovidestheinformationrequestedbytheNRCstaff.Ifyouhaveanyquestionsorrequireadditionalinformation,pleasecontactMr.ThomasShaubat(804)273-2763.

Sincerly,J.anPrice.iePresident-NuclearEngineering AttachmentResponsetoRequestforAdditionalInformationRegardingNDE-005Commitmentsmadeinthisletter:1.None cc:U.S.NuclearRegulatoryCommissionRegionIISamNunn AtlantaFederalCenter 61ForsythStreet,SWSuite23T85 Atlanta, Georgia 30303 Mr.J.E.Reasor, Jr.OldDominionElectricCooperative Innsbrook Corporate Center4201DominionBlvd.Suite300GlenAllen,Virginia23060 NRC SeniorResidentInspectorNorthAnnaPowerStationMs.D.N.WrightNRCProject ManagerU.S.Nuclear Regulatory CommissionOneWhiteFlintNorthMaiIStop 0-8 H4A 11555RockvillePikeRockville,Maryland20852 Mr.J.F.Stang, Jr.NRCProject ManagerU.S.NuclearRegulatoryCommissionOneWhiteFlintNorthMaiIStop 0-8 G9A 11555RockvillePikeRockville,Maryland20852 Serial No.09-265 Docket No.50-338Requestfor Additional Information NDE-005 Page 2 of 2 SerialNo.09-265DocketNo.50-338 ATTACHMENT FOURTH INTERVAL lSI PLAN RESPONSETOREQUESTFOR INFORMATION REGARDING NDE-005 VIRGINIAELECTRICANDPOWER COMPANY NORTHANNAPOWER STATIONUNIT1 SerialNo.09-265DocketNo.50-338RequestforAdditional Information Regarding NDE-005 BackgroundByapplicationdatedOctober7,2008(AgencywideDocumentsAccessandManagementSystem(ADAMS)AccessionNumberML082880160),as supplementedbyletterdatedJanuary30,2009(ADAMSAccessionNo.ML090330392),VirginiaElectricandPowerCompany(thelicensee)submittedthefourthintervalinserviceinspection(lSI)planandassociatedproposedalternativesandreliefrequestsfromrequirementsofSectionXIoftheAmericanSocietyofMechanicalEngineers,BoilerandPressureVesselCode(ASMECode),forNorthAnnaPowerStationUnit No.1.Specifically,requestNDE-005pertainstosixweldoverlaysthatwereinstalledduringthethirdlSIinterval.TheNuclearRegulatoryCommission(NRC)staffdeterminedthatadditionalinformationisrequiredtocompletetheevaluationfortherequest.RequestNDE-005issimilartoapplicationstheNRCstaffhasreviewedthatrequesteduseofCodeCaseN-504-2asconditionedtoSectionXI,Appendix QinRegulatoryGuide1.147,"InserviceInspectionCodeCaseAcceptability,ASMESectionXI,Division1."Inaccordancewiththe gUidance,theNRCstaffidentifiedmissinginformationinyourrequestandareasinneedofclarification.Pleaseaddressthefollowingquestions:

NRC Question 1RequestNDE-005statesinPartAofthealternativethatthereliefistocontinueISisusingproceduresandpersonnelqualifiedtoAppendixVIII, Supplement11,asmodifiedbyAttachment1ofthesubmittal.Supplement 11isfortheexaminationof wroughtstainlesssteelpipingandweldoverlays.Provideadescriptionofthebasematerial, weld/buttermaterial,andoverlaymaterial(wroughtorcaststainlesssteel,Inconel,carbonsteel,etc.).

Dominion ResponseThefollowingmaterialsareincludedinthebasematerial, weld/buttermaterial,andoverlaymaterial:Nozzlesare(P-No.3Group No.3)LowAlloySteelSA-508CL2*SafeEnd-to-NozzleWeldandbutteringareAlloy82/182(F-No.43)*SafeEndsare(P-No.8)WroughtStainlessSteel(SS)SA-182GRF316LSurgeLinePipe,SafetyLineElbows,ReliefLineReducerandSprayLinePipeare(P-No.8)

WroughtSeamlessSSandWeldsareSS(A-NO.8)*WeldingofStructuralOverlaywasperformedusingERNiCrFe-7(Alloy52)orERNiCrFe-7A(Alloy52M)

Page 1 of 2 SerialNo.09-265DocketNo.50-338RequestforAdditional Information Regarding NDE-005NRCQuestion2 The alternative'sexaminationrequirementsaresimilartotheexaminationrequirementsofSectionXI,Appendix Q,forISis.Oneoftherequirementsisfor ultrasonicexaminationofoverlaysduringthefirstorsecondrefuelingoutagefollowinginstallation.DiscusswhethersuchexaminationshavebeenperformedorplanstodosointhefourthlSIinterval.

Dominion ResponseDuringtheUnit1fall2007refuelingoutage,fullstructuralmitigativePWOLsforthe pressurizersafety,spray,relief,andsurgenozzleswerecompleted.Examinationsofthesepressurizerweldoverlayswerecompletedduringthespring2009outageforUnit1.Examinationsinthe4thintervalwillbecompletedinaccordancewiththisrelief request.NRCQuestion3PartB,Paragraph(a)(3)ofNDE-005statesthat,"TheinserviceexaminationacceptancestandardsofTableIWB-3514-2shallbemetfortheweldoverlay.IftheacceptancecriteriaofTableIWB-3514-2cannotbemet,theacceptancecriteriaofIWB-3600shallbemetfortheweldoverlay.Cracksintheouter25%ofthebasemetalshallmeetthedesignanalysisrequirementsofAttachment2,CrackGrowthandDesign."AccordingtoMRP-139,"PrimarySystemPipingButtWeldInspectionandEvaluationGuide,"theweldoverlaymaterialmustberesistanttostresscorrosioncracking.Assuch,similarapplicationshaveincludedthephrase,"Anyindicationcharacterizedasstresscorrosioncrackingintheweldoverlaymaterialis unacceptable."Discusstheplansforaddressingstresscorrosioncracking.

Dominion ResponseIfflawgrowthintheweldoverlayoccursandtheacceptancestandardsofTableIWB-3514.2cannotbemet,adeterminationwillbemadetoproveiftheflawisnotPWSCC.IfthecauseisdeterminedtobePWSCCorthecauseoftheflawcannotbedetermined,NorthAnnawillrepairtheflawandwillnotuseIWB-3600ofASMECode,SectionXItoacceptthesetypesofflaws.

Page2of2