ML091320639
| ML091320639 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/12/2009 |
| From: | Hartz L Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 9-253, N1-I3-NDE-024, N2-I3-NDE-025 | |
| Download: ML091320639 (7) | |
Text
SerialNo.09-253 NL&OS/ETS RODocketNos.50-338 50-339LicenseNos.NPF-4 NPF-710CFR50.55a VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261May12,2009U.S.NuclearRegulatoryCommissionAttention:DocumentControlDeskWashington,D.C.20555 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS1AND2 REACTOR COOLANT PRESSURE BOUNDARY VISUAL INSPECTIONS PROPOSED ALTERNATIVE-N1-13-NDE-024ANDN2-13-NDE-025Pursuantto10CFR50.55a(a)(3)(i),Dominionrequestsapprovalofanalternativetotheinspectionrequirementsoffootnote1includedin10 CFR50.55a(g)(6)(ii)(E), ReactorCoolantPressure BoundaryVisualInspections,forNorthAnnaUnits1and2.TherequestedalternativewillpermittheinspectionsperformedduringtheUnit1fall2007andUnit2fall2008refuelingoutagesonthebottommounted instrumenttubes(8MI)tobeusedastheinitialreactorcoolantpressureboundaryvisualinspectioninplaceofthefootnoterequirementfortheinitialinspectiontobeperformedatthenextrefuelingoutageafterJanuary 1,2009.Alternatives N1-13-NDE-024andN2-13-NDE-025areincludedintheattachmenttothisletteraswellasthebasisforthealternative.The8MIinspectionsperformedduringthefall2007and2008refuelingoutagesforNorthAnnaUnits1and2,respectively,conformedtotherequirementsofCodeCaseN-722andmettherequirementsof10CFR50.55a(g)(6)(ii)(E).Therefore,Dominionconsidersthevisualexaminationsperformedduringthefall2007refuelingoutageforNAPSUnit1andfall2008refuelingoutageforNAPSUnit2toprovideanacceptablelevelofqualityandsafetyasanalternativetoperformingtheinitialinspectionsinthenextrefuelingoutageafterJanuary 1,2009,asindicatedin10CFR50.55a(g)(6)(ii)(E).Ifyoushouldhaveanyquestionsregardingthissubmittal,pleasecontactMr.ThomasShaubat(804)273-2763.
Sincerely,LeslieHartzVicePresident-NuclearSupportServices
Attachment:
ProposedAlternatives-N1-13-NDE-024 and N2-13-NDE-025Commitmentsmadeinthisletter:None cc:U.S.NuclearRegulatoryCommissionRegionIISamNunnAtlantaFederalCenter 61ForsythStreet,SWSuite23T85 Atlanta, Georgia 30303Mr.J.E.Reasor,Jr.OldDominionElectricCooperative InnsbrookCorporateCenter4201DominionBlvd.Suite300GlenAllen,Virginia23060 NRC SeniorResidentInspectorNorthAnnaPowerStationMs.D.N.WrightNRCProject ManagerU.S.NuclearRegulatoryCommissionOneWhiteFlintNorthMailStop 0-8 H4A11555RockvillePikeRockville,Maryland20852Mr.J.F.Stang,Jr.NRCProject ManagerU.S.NuclearRegulatoryCommissionOneWhiteFlintNorthMaiIStop 0-8 G9A11555RockvillePikeRockville,Maryland20852SerialNo.09-253 Docket Nos.50-338/339 AlternativeforBMI Baseline Inspections Page 2 of 2 SerialNo.09-253DocketNos.
50-338/339 ATTACHMENT REACTOR COOLANT PRESSURE BOUNDARY VISUAL INSPECTIONS PROPOSED ALTERNATIVEN1-13-NDE-024andN2-13-NDE-025 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS1AND2 10CFR50.55aRequestNumber N1-13-NDE-024/N2-13-NDE-025 AlternativeBMIVisual Examinations Requirement Proposed Alternative in Accordance with10CFR 50.55a(a)(3)(i)
- Alternative Provides AcceptableLevelof QualityorSafety--1.0ASMECodeComponentsAffectedCodecomponentsassociatedwiththisrequestareClass1ReactorPressureVessel(RPV)bottom-mountedinstrumentpenetrations(BMI)havingpressureretainingpartialorfullpenetrationweldsincomponentsfabricatedwithAlloy600/82/182material.
1.1CategoryandSystemDetails:CodeClass:
System:ExaminationCategory:ItemNumber:Class1ReactorPressureVessel B-P B15.801.2ComponentDescriptions:ReactorVessel-RPVbottom-mountedinstrumentpenetrations 2.0ApplicableCodeEditionAndAddendaNorthAnnaPowerStationUnits1and2arecompletingtheirthird10-yearlSIIntervals.Unit1'sthirdintervalbeganonMay1,1999andendsonApril30,2009andUnit2'sthirdintervalbeganonDecember14, 2001andendsonDecember13,2010.TheASMEBoilerandPressureVesselCode(ASMECode)ofrecordfortheapplicableintervalisthe1989EditionforUnit1andthe1995Edition,1996AddendaforUnit2.
3.0ApplicableCodeRequirements10CFR50.55a(g)(6)(ii)(E),Reactorcoolantpressureboundaryvisual inspections,wasrecentlyincorporatedintothe10CFR50.55a.Thenewregulationsaugmentedtheinserviceinspectionrequirements(effectivedate October 10,2008).Specifically,10CFR50.55a(g)(6)(ii)(E)requiresthat"AlllicenseesofpressurizedwaterreactorsshallaugmenttheirinserviceinspectionprogrambyimplementingASMECodeCaseN-722subjecttotheconditionsspecifiedin10CFR50.55a(g)(6)(ii)(E)(2)through(4)ofthissection.TheinspectionrequirementsofASMECodeCaseN-722donotapplytocomponentswithpressureretainingweldsfabricatedwithAlloy600/82/182materialsthathavebeenmitigatedbyweldoverlayorstressimprovement."Page1of4 10CFR 50.55a Request Number N1-13-NDE-024/N2-13-NDE-025 Alternative 8MI Visual Examinations Requirement In addition, footnoteoneto10CFR 50.55a(g)(6)(ii)(E) statesinpart:"For inspectionstobe conductedeveryrefuelingoutageand inspections conducted every otherrefuelingoutage,theinitial inspectionshallbe performedatthenext refueling outage after January1,2009." 4.0ReasonFor Request North AnnaPowerStation(NAPS)Unit1andUnit2 completedbaremetalvisual examinationofRPV bottom-mounted instrument penetrations priortothe"initial inspection" indicatedby10CFR 50.55a(g)(6)(ii)(E), which became effective October10,2008.NAPSUnit1 inspections were performed duringthefall2007 refuelingoutage,andNAPSUnit2 inspections were performed duringthefall2008refuelingoutage.Thesebaremetalvisual inspectionsmetthe intent ofASMECodeCaseN-722.
CodeCaseN-722,"Additional ExaminationsforPWR Pressure Retaining WeldsinClass1 ComponentsFabricatedwithAlloy 600/82/182 Material," establishes additional requirementstothe examination requirements of TableIWB-2500-1for pressurized waterreactorplantshavingpartialorfull penetration welds in Class 1 components fabricatedwithAlloy 600/82/182 material.For ReactorVesselItem NumberB15.80,RPV bottom-mounted instrument penetrations, all penetrationsrequireVisual Examination(VE)tothe requirementsofIWB-3522,everyotherrefuelingoutage.ASMECodeCaseN-722 includes specific requirementsfortheVEandthe qualification of personnel performingtheVE:(3)TheVisual Examination (VE)performedonAlloy 600/82/182 components for evidence of pressure boundary leakage and corrosion on adjacentferriticsteel components shall consistofthe following:(a)A directVEofthe bare-metal surface performedwiththe insulation removed.Alternatively,theVEmaybe performed with insulation inplaceusingremotevisual inspection equipment that provides resolutionofthe component metal surface equivalenttoa metal direct VE.(b)TheVEmaybe performedwhenthesystemor component is depressurized.(c)The directVEshallbe performedata distance not greaterthan4 ft(1.2m)fromthe componentandwitha demonstrated illumination level sufficienttoallowresolutionof lower case charactershavinga heightofnot greaterthan0.105in(2.7mm).
(4)Personnel performingtheVEshallbe qualifiedasVT-2visual examinersandshallhave completed a minimumoffour (4)hours of additionaltrainingin detection of borated water leakage from Alloy 600/82/182 componentsandtheresultingboricacid corrosion of adjacentferriticsteel components.
Page 2of4 10CFR 50.55a Request Number N1-13-NDE-024/N2-13-NDE-025 Alternative 8MI Visual Examinations RequirementThebottom-mountedRPVinstrumentpenetrationsexaminationsduringthefall2007andfall2008refuelingoutageswereperformedtotheenhancedVisualExamination(VE)requirementsandthepersonneltrainingandqualificationrequirementsasdescribedinEnclosure1,"ExaminerQualificationandResolutionsRequirements."5.0ProposedAlternativesAndBasisForUseVirginiaElectricandPowerCompany(Dominion)considersthevisualexaminationsperformedduringthefall2007refuelingoutageforNAPSUnit1andfall2008refuelingoutageforNAPSUnit2toprovideanacceptablelevelofqualityandsafetyasanalternativetoperformingtheinitialinspectionsinthenextrefuelingoutageafterJanuary1,2009,asindicatedin10CFR50.55a(g)(6)(ii)(E).Therefore,theinspectionperformedduringthefall2007refuelingoutageforNAPSUnit1andfall2008refuelingoutageforNAPSUnit2canbeconsideredtheinitialinspectionstomeetthe10CFR50.55a(g)(6)(ii)(E)footnoterequirementsfortheperformanceoftheinitialinspection.InaccordancewithASMECodeCaseN-722,thebottom-mountedRPVinstrumentpenetrationexaminationsarerequiredtobeperformedatleasteveryotherrefuelingoutage.Therefore,thenextexaminationsofItemNo.B15.80components(bottom-mountedRPVinstrumentpenetration)willbeperformednolaterthanthefall2010refuelingoutageforUnit1andnolaterthanthefall 2011refuelingoutageforUnit2.Dominionrequestsapprovalofthisalternativepursuanttotheprovisionsof10CFR50.55a(a)(3)(i).
6.0DurationOfProposedAlternativeTheproposedalternativetothe10CFR50.55a(g)(6)(ii)(E)requirementsisapplicablefortheremainderofthethird10-yearinserviceinspection(lSI)intervalatNAPSUnits1and2.
7.0 Precedents None 8.0 References None9.0Enclosures(1)ExaminerQualificationandResolutionRequirements Page3of4 10CFR 50.55a Request Number N1*13*NDE*024/N2*13*NDE*025 AlternativeBMIVisual Examinations Requirement ENCLOSURE 1ExaminerQualificationsandResolutionRequirementsThisenclosuredocumentsacomparisonofthebaremetalvisualexaminationsperformedonthereactorpressurevesselbottommountedinstrumentation(BMI)nozzlesatNorthAnnaPowerStationUnits1
&2performedduringpreviousoutages (N1R19andN2R19)withthenewrequirementsofCodeCaseN-722.Twoareasrelatedtoexaminationequivalencywererequiredtobeaddressed;personnelqualificationsandresolutionrequirements.
Personnel QualificationsTheexaminersthatperformedtheseexaminationsheldcurrentVT-2(non-alternative)andVT-3qualifications.Inaddition,eachoftheexaminershadsuccessfullytakentheDominionBoricAcidCorrosionControl(BACC)Inspectortraining.TheinspectionteamincludedatleastoneVTexaminerthathasalsocompletedtheDominionBACCEvaluatortrainingandqualificationrequirements.TheexaminersthatperformedthesebaremetalvisualexaminationsmettherequirementsofCodeCaseN-722asVT-2qualifiedexaminerswithanadditionalfourhoursoftrainingaddressingthedetectionofboratedwaterleakagefromAlloy600/82/182componentsandtheresultingboricacidcorrosionofadjacentferriticsteel components.Basedupontheadditionaltrainingofthevisualexaminers;thebaremetalvisualexaminationsoftheBMInozzlepenetrationsperformedduringthe N1R19andN2R19outagesareconsideredequivalenttothepersonnelqualificationrequirementsofCodeCaseN-722.
Resolution RequirementsThepreviousbaremetalvisualexaminationswereperformedusinga(VT-2)examinationtechniqueandrequiredeachpenetrationtobeexaminedforevidenceofleakagefor360degreesaroundeachnozzle.ThebaremetalvisualexaminationsweredocumentedintheapplicableEngineeringPeriodicTestProcedure.Theseperiodictestproceduresspecifytheuseofinspectionequipmenttobeusedfortheinspection,whichconsistsofamirror,portablelights,andavisualtestingexaminationresolutioncard.AccesstotheBMInozzlesforthebaremetalvisualexaminationisthroughremovableinsulationpanels.ThebaremetalvisualexaminationsoftheBMInozzleswereperformedinaccordancewiththedirectvisualexaminationrequirementsofwithin4feetandsufficientilluminationtoresolve0.105incheslowercasecharacters.BasedupontheaccessfortheexaminertoperformthebaremetalvisualexaminationsoftheBMInozzlepenetrations,theequipmentusedtoperformtheexamination(mirror,flashlight,0.105incheslowcasecharacterresolutioncard),thepreviouslyperformedbaremetalvisualexaminationsoftheBMInozzlepenetrationareconsideredequivalenttotheresolutionrequirementsofCodeCaseN-722.Page4 of 4