ML101170589

Response to Request for Additional Information Fourth Interval Inservice Testing Program Plan and Proposed Alternatives and Relief Requests

ML101170589
Person / Time
Site:	North Anna
Issue date:	04/27/2010
From:	Price J Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
10-236
Download: ML101170589 (6)

Text

10CFR50.55a VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 April 27, 2010U.S.NuclearRegulatoryCommissionAttention:DocumentControlDeskWashington,D.C.

2055!5SerialNo.NL&OS/ETSDocketNos.LicenseNos.10-236 RO 50-338/339 NPF-4/7 VIRGINIA ELECTRICANDPOWER COMPANY (DOMINION)

NORTH ANNA POWER STATIONUNITS1AND2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION FOURTH INTERVAL INSERVICE TESTING PROGRAM PLAN AND PROPOSEDALTE:RNATIVESANDRELIEF REQUESTSInaNovember24,2009letter(SerialNo.09-715),DominionsubmittedtheFourthIntervalInserviceTesting (1ST)ProgramPlansforNorthAnnaPowerStationUnits1and2.Pursuantto10CFR50.55a(f)(4)(ii),the 1STprogramswereupdatedtocomplywiththeASMECodeforOperationsandMaintenanceofNuclearPowerPlants2004Edition.Theattachmentstothatletterincludedthe 1STProgramPlans,whichdescribedtheprogrammaticaspectsofthe 1STprograms,andincludedtheassociatedproposedalternativesandreliefrequestsforthefourthinterval.InanApril6,2010e-mailfromDr.V.Sreenivas,theNRCrequestedadditionalinformationtocompletethereviewoftheproposedalternativesandreliefrequests.Inafollow-upphonecallwiththeNRCforclarificationoftherequestforadditionalinformation,DominionagreedtoreviseandresubmitPumpReliefRequest P-1forbothNorthAnnaUnits1and2.Thefourth 1STintervalwillbeginonDecember15,2010andNorthAnnaUnits1and2willbeginimplementationoftheplansonthatdate.Therefore,DominioncontinuestorequestreviewandapprovalofthereliefrequestsbyDecember1,2010.Ifyouhaveanyquestionsorrequireadditionalinformation,pleasecontactMr.ThomasShaubat(804)273-2763.RespectfuIly,Commitmentsmadeinthisletter:None

Attachment:

ResponsetoRequestForAdditionalInformationFourthIntervalInservice Testing REdief Requests cc:U.S.Nuclear Regulatory CommissionRegionII Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, Georgia Mr.J.E.Reasor,.lr, Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.Suite300GlenAllen, Virginia 23060 NRC Senior Resident InspectorNorthAnna Power StationMs.K.R.Cotton NRC Project ManagerU.S.Nuclear Regulatory Commission One WhiteFlintNorthMailStop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852Dr.V.Sreenivas NRC Project ManagerU.S.Nuclear Regulatory Commission One WhiteFlintNorthMailStop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852SerialNo.10-236 Docket Nos.50-338/339 ResponsetoRAls 1ST Relief Requests Page 2 of 2 SerialNo.10-236DocketNos.

50-338/339ResponsetoRAls 1STReliefRequests Attachment RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION FOURTH INTERVAL INSERVICE TESTING RELIEF REQUESTS North Anna Power Station Units1and2 Virginia Electric and Power Company (Dominion)

SerialNo.10-236 ResponsetoRAls 1ST Relief RequestsPage1of3 REQUEST FOR ADDITIONAL INFORMATION(RAnFOR NORTH ANNA POWER STATIONS (NAPS)(TACNosME2748,ME2749,ME2753thruME2760,ME2763thruME2772,andME2776thruME2789)

BACKGROUNDByletterdated NovembHr24,2009(AgencywideDocumentsAccessand ManagementSystem(ADAMS)AccessionNo.ML093350600),VirginiaElectricandPower CompanysubmittedFourthIntervalInserviceTesting (1ST)ProgramReliefRequests P-1thruP-8forpumps,and V-1thruV-3forvalvesforNorthAnnaPowerStationUnits1and2.InanApril6,2010,e-mailfromDr.V.Sreenivas,theNRCrequestedadditionalinformationtocompletethereviewoftheproposed 1STreliefrequests.ThefollowinginformationisprovidedtoaddresstheNRC concerns/questions.

ResponsetoRequest forAdditionalInformationRAIP-1-1:PumpReliefRequestNo.P-1,Section4.0,ReasonforRequest,firstparagraph,secondlinestates"Thereisatleastonepumpineachgroupwithatleastonevibrationreferencevalue(Vr) thatiscurrentlylessthan0.05inchpersecond(ips).Pleasespecifyandclarifywhichpump(s)fromeachofthepumpgroupshavevibrationreferencevaluelessthan0.05ips,becausethisreliefrequestisonlyapplicabletopumpswhosemeasureclreferencevalue(Vr)islessthan0.05ips.

Dominion Response:AsaresultoftheApril8,2010teleconferencebetween representativesoftheNRCandDominion,itisunderstoodthatreliefwillberestrictedtoonlythosepumpsthathaveatleastoneVrvaluethatiscurrentlybelow0.05ips.Therefore,NorthAnnaPowerStationwillrevisePumpReliefRequestsNo.

P-1forNorthAnnaUnits1and2toincludeonlythepumpsthathaveVrvalue(s)currentlybelow0.05ips,andresubmitthereliefrequests.RAIP-1-2:PumpReliefRequest l\Jo.P-1,Section4.0,ReasonforRequest,thirdparagraph,secondlinestates"ThisminimumvaluewillbeappliedtoindividualvibrationlocationsforthepumpslistedinTable P-1wherethemeasuredreferencevalueislessthan0.05ips."PleaseverifyandconfirmthateachpumplistedinTable P-1hasatleastonereferencevaluelessthan0.05ips.

SerialNo.10-236ResponsetoRAls 1STReliefRequests Page 2of3DominionResponse:DuringtherevisionofPumpReliefRequestNo.

P-1forNorthAnnaUnits1and2,themeasuredreferencevalueswillbeverifiedandconfirmedtobelessthan0.05ipsforthepumpslistedinthe revisedreliefrequests.RAIP-1-3:PumpReliefRequest No.P-1,Section4.0,ReasonforRequest,doesnotincludeinformationon(1)bearingtemperaturemeasurementandtrending;(2) thermographyanalysis;and(3)enhancedvibrationmonitoring,aspartofNAPSPredictiveMaintenanceProgram(PdM).PleaseconfirmthatthePdMatNAPS,Units1and2includesinformationsuchasbearingtemperaturetrending, thermographicanalysis,andenhancedvibrationmonitoring.DominionResponse:Referencestobearingtemperaturemeasurementandtrending,and thermographyanalysiswerenotincludedinPumpReliefRequestNo.

P-1becausethesemonitoringassessmentsarenotperformedroutinely,butratherareusedonalimitedbasisfor diagnosticevaluations.Therefore,itwasconcludedthatthedescriptioninSection4.0,ReasonforRequest, wasmoreaccuratelyconveyedwithoutcreditingthese diagnostic activities.Forvibrationmonitoring,theNAPSPdMprogramemploystechniquesusedtypicallyformonitoringandanalysisofplantrotatingequipment.Thistechnologyanalyzesandtrendsdisplacement, veocity,andaccelerationvibrationpatternstopredicttheneedtocorrectproblemsinrotatingequipmentsuchasdegradedbearings,improperalignments,andout-of-balanceorworncomponentspriortoequipmentfailure.Thisenhancedvibrationmonitoringprogramisappliedtothe 1STprogrampumps.RAIP-1-4:PumpReliefRequestNo.P-1,Section7.0,Precedents,thelastparagraph,statesthat"NotethatRelief Request P-1appliestoallpumpswithinthegrouplistedinTableP-1.Pumps1-CH-P-1B,1-HV-P-20Cand1-RS-P-3BforNAPSUnit1,and2-CH-P-1A,2-CH-P-1C,2-FW-P-3B,2-HV-P-20Cand 2-SI-P-1BforNAPSUnit2donothaveameasuredreferencevaluebelow0.05ipsforaparticularvibrationlocationbutareincludedinthereliefrequestscope."Pleaseprovidethemeasuredreferencevaluesforthesepumps.

SerialNo.10-236ResponsetoRAls 1STReliefRequests Page 3 of 3 Dominion Response:Asdiscussedinthe responsetoRAI P-1-1above,PumpReliefRequestNo.

P-1 forNorthAnnaUnits1 and2willberevisedtolistonlypumpsthathaveVr valuers)currentlybelow0.05ips.RAI-P-5-1:PumpReliefRequest No.P-5,Section5.0,ProposedAlternativeandBasesforUse,secondparagraph,firstlinestates"TheremovalofquarterlyflowtestingofthesepumpshasbeendeemedacceptableperNRCGenericLetter(GL)89-04,Position9".Pleasenotethattheuseof GL.89-04,Position9requiresthatdata(differentialpressureandvibration)collectedduringminimum-flowtesting(quarterly)anddatafromfullflowshutdownorrefuelingoutage)shouldbetrendedasrequiredbyIWP-6000(NowitisISTB-6000).ReliefRequestP-5doesnotdiscusstrendingofthemeasureddatawhileusingGL89-04,Position9.PleaseconfirmthatthetrendingofmeasureddatawillbeperformedatNAPS,Units1and2forP-5asrequiredbyGL89-04,Position9.

Dominion Response:NorthAnnaPowerStationwilltrendthemeasureddatadescribedinPumpReliefRequestNo.P-5asrequiredbyISTB-6000.RAI-P-6-1:PumpReliefRequestNo.P-6,Section4.0,ReasonforRequest,ISTB-3300(e)(1),firstparagraph,fourthlinestatesthatthe"TheLOCAcontainmentanalysisflowrateof3350gpmwillbeusedasthepumpdesignflow."IntheNAPS,Units1and2previous(third) 10-year 1STprogram,thedesignflowusedforthesepumps1-RS-P-2A12Band 2-RS-P-2A12Bwas3640gpm.Pleaseexplainthedifferentdesignflowvaluesforthese pumps.Dominion Response:Thethirdinterval 1STprogramreliefrequestreferencestwoflowrates,thedesignflowrateof3640gpm,andthesafetyanalysisflowrateof3450gpm.Thedesignflowrateof3640gpmisrelatedtothepumpcapacity.ThesafetyanalysisflowrateshouldbeconsideredthepumpdesiqnflowratereferencedintheASMEOMCode,SubsectionISTBbecausethisistheflowratethepumpmustdelivertosatisfythe assumptionsmadeinthesafetyanalysis.Thesafetyanalysisminimumflowratewasreducedfrom3450gpmto3350gprnbecauseoftheincreaseddesignbasisheadlossesonthesuctionsideofthepumpsasaresultoftheNRCGSI-191containmentsumpstrainermodifications.The UFSARsafetyanalysiswaschangedtoreflectthereductioninthedeliveredflowrequirementsfortheoutsiderecirculationspraypumps.