ML101760220
| ML101760220 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/24/2010 |
| From: | Hartz L Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 10-0078, N2-I4-CS-001 | |
| Download: ML101760220 (7) | |
Text
10CFR50.55a VIRGI NI A ELE C TRI C AND POWER COMPANY RICHMOND, VIRGI NI A 23261 June 24, 2010 U.S.Nuclear Regulatory Commission Attention:
Document Control Desk Washington
, D.C.20555SerialNo.NL&OS/ETS Docket No.License No.10-0078 R1 50-339 NPF-7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)NORTHANNA POWER STATIONUNIT2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST N2-14-CS-001 FOURTH INTERVAL INSERVICE INSPECTION PLANInaletter dated February1,2010(SerialNO.10-007)
, Dominion submittedtheNorthAnnaPower Station,Unit2 , Inservice Inspection(lSI)PlanforthefourthlSIinterval,whichis applicable to Class1,2,and3, components and component supports.ThelSI Plan describes the programmatic aspectsoflSI examinations of components and component supports.NorthAnnaUnit2wasnot designed or licensed to standards that completelymeetthe detailed lSI examination and system pressure test requirements presently specifiedinthe 2004ASMECode.Therefore, pursuantto10CFR50.55a (a)(3)(i)and/or(ii)and10CFR 50.55a(g)(5)(iv)
, Dominion requested relief and/or theuseof alternative examinationortest ing requirementsinplaceof certain examination or testing requirementsofthe2004ASMECode.InaJune1,2010
, e-mailfromDr.V.SreenivastheNRC requested additional information regarding relief request N2-14-CS-001.
Information to addresstheNRC concerns is includedinthe attachmenttothisletter.
Dominion continues to requestreviewand approvalofthereliefrequestsby December1,2010,in order to implementthePlanatthe startofthefourthlSIinterval.Ifyouhaveany questionsorrequire additional information, please contact Mr.Thomas Shaubat(804)273-2763.Respectfully
,L.N.Hartz U Vice President-Nuclear Support Services Commitmentsmadeinthisletter:None
Attachment:
Response to Request for Additional InformationforNorthAnnaPower Station-Relief Request N2-14-CS-001 cc:U.S.Nuclear Regulatory Commission Region IIMarquisOne Tower245Peachtree CenterAvenue,NESuite1200 Atlanta, Georgia 30303-1257Mr.J.E.Reasor,Jr
.OldDominionElectric Cooperative Innsbrook Corporate Center4201DominionBlvd.Suite300GlenAllen ,Virginia23060 NRC SeniorResidentInspectorNorthAnnaPowerStation Ms.K.R.CottonNRCProject ManagerU.S.Nuclear Regulatory CommissionOneWhiteFlintNorthMailStop 0-8 G9A11555RockvillePikeRockville,Maryland20852Dr.V.SreenivasNRCProject ManagerU.S.Nuclear Regulatory CommissionOneWhiteFlintNor thMailStop 0-8 G9A11555RockvillePikeRockville,Maryland20852SerialNo.10-0078DocketNo.50-339ResponsetoRAIforCS-001Page2of2 SerialNo.10-0078DocketNo.50-339 Attachment RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST N2-14-CS-001NorthAnnaPower StationUnit2 VirginiaElectricand Power Company (Dominion)
Ser ial No.1 0-0078DocketNo.50-339 ResponsetoRA IforCS-001 Page 1of4 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION NORTHANNAPOWER STATION UNIT 2 RELIEF REQUEST N2-14-CS-001(TACNO.ME3292)BackgroundByletterdatedFebruary 1,2010(AgencywideDocuments.Access&ManagementSystem(ADAMS)AccessionNo.ML100330125),VirginiaElectricandPowerCompany, (Domin ion)requestedaRequestforRelief(RR), N2-14-CS-001,fortheFourth10-YearInserviceInspectionIntervalatNorthAnnaPowerStation,Unit2(NAPS2).ThisreliefrequestwassubmittedunderTitle10oftheCodeofFederalRegulations(10CFR) 50.55a(a)(3)(ii)duetothehardshipofsatisfyingtherelevantrequirementsoftheAmericanSocietyofMechanicalEngineersBoilerandPressureVesselCode(ASMECode)
, SectionXIforthespecifiedASMECodeClass1and2components.InaJune1,2010,e-mailfromDr.V.Sreenivas,theNRCrequestedaddit ionalinformationregardingreliefrequest N2-14-CS-001
.TheASMECodeofrecordfortheNAPS2Fourth10-YearIntervallSIProgramisthe2004EditionoftheASMECode,SectionXIwithnoAddenda
.Reguest for Additional Information NRC Question 1:ThesubmittedReliefRequest,Section4
,ReasonforRequest,page3-7,VisualInspection,thirdparagraphstates"Historically,thenumberofunacceptablevisualsnubberinspectionsatNAPSUnit2isoneorlessandbasedonthesnubberpopulation,thecurrentinspectionintervalis48months(everyotherrefuelingoutage).Pleaseexplain:(1)Whatisthemeaningoflessthanoneunacceptablesnubberduringvisua l inspection(snubberinspectioncannotbecountedlessthanone)?(2)Whatmethodofcategorizing(smallbore,largeboreorcombinedonepopulation)snubbersisbeing usedwhileperformingvisualinspectionsatNAPS2?
Dominion Response:(1)Inthecontextofthesubmittal,"lessthanone "equalszerounacceptablevisualsnubberduringthoseinspections
.Therehavebeenunacceptablesnubbersidentifiedduringpreviousinspections.However,thestatementwasmadetoprovideperspectiveonthe numberofsnubberfailuresroutinelyidentifiedduringtheperiodicinspections.(2)Thesafety-relatedsmallboresnubbersinUnit2aregroupedintooneinaccessiblepopulation.Wegroupthetwelve(12)Unit2largeboresnubbersintoaseparateinaccessiblepopulation.
SerialNo.10-0078DocketNo.50-339 ResponsetoRAIforCS-001 Page 2of4 NRC Question 2:OMPart4requiresNAPS2tousea10%testplan,37snubbertestplanor55snubbertestplan.Inthesubmittedreliefrequest,NAPS2usestwo differentsamplingplans(1)oneforsmallbore;and(2)anotherforlargeboresnubbers.Pleaseexplainthereasonandbasisforusingtwodifferentandseparatetestsamplingplansforsmallandlargebore snubbers.Dominion Response:Thesamplesizeforsmallbore(50KIPSandless)andlargebore(greaterthan50KIPS)snubberstestingcomesfromtheNAPSTechnicalRequirementsManual(TRM).Thesmallboreandlargeboresnubberpopulationsareeachdividedinto6functionaltestsamplegroups.Onegroupofsmallboresnubbersandonegroupoflargeboresnubbersarefunctionallytestedeveryrefuelingoutage.ThebasisforthesamplesizesintheTRMwasdevelopedtocomplywithNRCGenericLetter84-13andoriginallyapprovedbytheNRConNovember21,1985asamendment58toFacilityOperatingLicenseNo.NPF-7.ThisamendmentrevisedSection4.7.10oftheTechnical Specificationstomodifyportionsofsnubbervisualinspectioncriteria
,establishseparatesamplingmethodsforfunctionaltestingofsmallandlargeboresnubbers,andestablishfunctionaltestmethodsforlargeboresnubbers.ThisrevisiontotheTechnicalSpecificationwaslaterincorporatedintotheTechnicalRequirementsManualwhenNorthAnnaPowerStationconvertedtoImprovedTechnicalSpecificationsinApril2002.
NRC Question 3:TRMpage3.7.5-5,secondparagraph,fifthline,states"Ifthefailureisdeterminedtobegeneric,anadditional10%ofthattypeofsnubbershallbefunctionallytested.Ifthefailureisdeterminedtobenon-generic,anadditional10%ofthattypesnubberwillbetestedduringthenextfunctionaltestperiod."Pleaseexplainthefollowing:a.Providedetailsabout"generic"and"non-generic"failures,andprovidethesectionnumberoftheOM-4Code,whichisbeingusedforthisrequirement.b.Define"functionaltestperiod,"andprovidejustificationtodelaytherequiredadditionaltestingtothenextfunctionaltestperiod.(Note:theCoderequiresthatadditionalfunctionaltestingtobeperformedinthesameperiod/interval.)
Dominion Response:a.AsstatedinReliefRequest N2-14-CS-001,a"non-generic "failurehasthesamedefinitionormeaningasan"isolated"failureinOMPart4,paragraph1.4entitled"Terminology".Anisolatedfailureis"afailureofasnubber,thenatureofwhichdoesnotlendothersnubberstobesuspect.
"Forexample,failuresresultingfromdamageduringinstallationorshutdown(i.e.,standingonthesnubber,droppingequipmentor
"--------
Ser ial No.10-0078DocketNo.50-339ResponsetoRAIforCS-001Page3of4toolsonthesnubber,missingpins
,etc).Conversely
,"generic"failuresareanyfailuresthatarenotisolatedandcouldlendothersnubberstobesuspect.IsolatedfailuresarespecifiedinOMPart4tobeatestfailuremodegroupinparagraph3.2.4.2(d)andthecorrectiveactionrequirementsforthisfailuremodearespecifiedinparagraph3.2.5.1(b).b.The"functionaltestperiod"isthecurrentrefuelingoutagewhentheselectedgroupisbeingtested.The"nextfunctionaltestperiod"istherefuelingoutagefollowingthecurrentrefuelingoutage.Bydefinition
,snubbersthatarecategorizedasnon-genericorisolatedfailuresdonotlendothersnubberstobesuspect.Therefore
,therewouldbenoreasontobelievethatothersnubbersmaybeaffectedbythefailuremechanism.Thus,deferralofadditionaltestingtothenextrefuelingoutageisjustified.TheASMEOMCodedoesnotrequireisolatedfailurestobecountedasunacceptable.Seeparagraph3
.2.5.1(b)oftheASMEOMCode.TheTRMrequirementfortesting"anadditional10%ofthattypesnubbertobetestedduringthenextfunctionaltestperiod"isnotanASMEOM-4Coderequirement,butisanadditionalrequirementoftheNAPS TRM.NRC Question 4OM-4,Paragraph3.2.4.2,TestFailureModeGroup,"statesthatunacceptablesnubber(s)shallbecategorizedintofailuremodegroup(s).Atestfailuremodegroup(s)shallincludeallunacceptablesnubbersthathaveagivenfailuremode,andallothersnubberssubjecttothesamefailuremode.PleaseexplainwhetherandhowtheserequirementswillbemetbyusingTechnicalRequ irementManual(TRM)3.7.5.
Dominion Response:SnubberfailuresatNAPSarenotcharacterizedintothefailuremodegroupsdefinedintheASMEOMcode.NorthAnnadoescharacterizethefailuresasgenericornon-genericasdiscussedaboveandfailuresareevaluatedaspartofthecorrectiveactionprogramtodetermineif:1)thefailurehasthepotentialtoaffectothersnubbers(extentofcondition)and2)whetherthecauseofthefailureisfromtheapplication,maintenancepractices,manufacturingdefects, etc....Thus,NorthAnnabelievesthatexistingmethodstocategorizeandevaluatesnubbersfailuresmeettheintentoftheOMCodewithouttheadditionaladministrativeburdenthatimplementingtheASMEOMcode inaverbatimmannerwouldrequire
.NRC Question 5ThesubmittedReliefRequest,Section4,ReasonforRequest,page3-6
,secondlinestates"TheexistingTRMtestandexaminationrequirementsmeettheintentofASMEOMPart4andprovideanacceptablelevelofqualityandsafety."However,thisReliefRequest,Section5,ProposedAlternativeandBasisforUse
,page3-13,thirdparagraph states"NootherrequirementsofOMPart4willbeimplementedaspartofthisalternative SerialNo.10-0078DocketNo.50-339ResponsetoRAIforCS
-001Page4of4forsnubberinserviceinspectionandtesting
.PleaseexplainandclarifywhySection5ofthisreliefrequeststatesthat"NootherrequirementsofOMPart4willbeimplemented,"whenSection4statesthattheexistingTRMmeetstheintentofOMPart4.
Dominion Response:ItisourpositionthattheexaminationandtestingperformedonsafetyrelatedsnubbersbasedontheexistingTRMrequirements,maintenanceproceduresandcorrectiveactionprogramprovideacomprehensiveprogramtoensurethereliableoperationofthesecomponents.Insomeaspects,ourprogramexceedsthatrequiredbytheASMEOMcodeandweconcludetheexistingprogramprovidesanacceptablelevelofqualityandsafety.TheintentoftheASMEOMcodeistoensurethereliableoperationofthesnubbers.Thus,NorthAnnabelievesthattheexistingsnubberprogram accomplishesthiswithouttheadditionaladministrativeburdenthatimplementingtheASMEOMcodeinaverbatimmannerwouldrequire.ThisapproachwasapprovedforNorthAnnaUnit1inaJune10
,2009letterentitled "NorthAnnaPowerStation,Unit No.1,Fourth10-YearInserviceInspectionandTestingIntervalforSnubberVisualExaminationandFunctionalTesting, Relief CS-001(TACNO.MD9957)
,"[ADAMSAccessionNo.ML091350058].