ML080950111

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Response to Request for Additional Information Regarding Proposed License Amendment Request One-Time Five-Year Extension to Type a Test Interval
ML080950111
Person / Time
Site: North Anna Dominion icon.png
Issue date: 04/03/2008
From: Bischof G T
Virginia Electric & Power Co (VEPCO)
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
08-0092A, RG-1.163
Download: ML080950111 (36)
v • d • e


Text

10CFR50.90 VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 April 3, 2008 U.S.NuclearRegulatoryCommission Attention:

DocumentControlDesk Washington,D.C.20555SerialNo.NL&OS/ETSDocketNo.LicenseNo.

08-0092A RO 50-339 NPF-7 VIRGINIA ELECTRICANDPOWER COMPANY (DOMINION)NORTHANNA POWERSTATIONUNIT2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT REQUEST ONE-TIME FIVE-YEAR EXTENSIONTOTYPEATEST INTERVALIna December5,2007letter(SerialNo.07-0769),Dominionrequestedanamendment,intheformofachangetotheTechnical SpecificationstoFacilityOperatingLicenseNumberNPF-7forNorthAnnaPowerStationUnit2.Theproposedchangewillpermitaone-timefive-yearexceptiontotheten(10)year frequencyofthe performance-basedleakageratetestingprogramforTypeAtestsasrequiredbyRegulatoryGuide(RG)1.163.Thisone-timeexceptiontothe requirementofRG1.163willallowthenextTypeAtesttobeperformednolater than October9,2014.InFebruary2,2008andMarch12,2008e-mailsas documentedinaMarch24,2008letter,theNRCstaffrequestedadditionalinformationregardingtheriskanalysisperformedtosupportthefive-yearintervalextensionandtheprevioustestsandinspectionsperformed,aswellastestsandinspectionsscheduledduringthe five-yearextendedperiod.TherequestedinformationregardingtheriskanalysiswasprovidedinaletterdatedMarch15,2008(SerialNo.08-0092).The attachmenttothisletterprovidestheremainderofthe containmenttestandinspectioninformationrequestedbytheNRCstaff.Theinformationprovidedinthisletterdoesnotaffecttheconclusionofthe significanthazardsconsiderationdiscussionprovidedinthe December5,2007Dominionletter(SerialNo.07-0769).

,2008.SerialNo.08-0092ADocketNo.50-339Requestfor Additional InformationOne-TimeFive-YearExtensiontoTypeATestIntervalPage2of3Shouldyouhaveanyquestionsorrequireadditionalinformation,pleasecontactMr.ThomasShaubat(804)273-2763.Verytrulyyours,VicePresident-Nuclea Enclosure1.ResponsetoRequestforAdditionalInformation Commitmentsmadeinthisletter:None.

COMMONWEALTH OF VIRGINIA COUNTYOFHENRICOTheforegoing documentwasacknowledgedbeforeme,inandfortheCountyand Commonwealthaforesaid,todaybyGeraldT.Bischof,whoisVicePresident-NuclearEngineering,ofVirginiaElectricandPowerCompany.Hehasaffirmedbeforemethatheisdulyauthorizedtoexecuteandfiletheforegoing document in behalfofthatCompany,andthatthe statementsinthe document aretruetothebestofhisknowledgeandbelief.

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Serial No.08-0092A DocketNo.50-339 Request for Additional Information One-Time Five-YearExtensiontoTypeA Test IntervalPage3of3cc:U.S.NuclearRegulatoryCommissionRegionIISamNunnAtlantaFederalCenter61ForsythStreet,SWSuite23T85Atlanta,Georgia30303Mr.J.E.Reasor,Jr.OldDominionElectricCooperative InnsbrookCorporateCenter4201DominionBlvd.Suite300GlenAllen,Virginia23060StateHealth Commissioner Virginia DepartmentofHealthJamesMadisonBuilding-i h floor 109 Governor StreetSuite730Richmond,Virginia23219 NRC SeniorResidentInspectorNorthAnnaPowerStationMr.S.P.LingamNRCProject ManagerU.S.NuclearRegulatoryCommissionOneWhiteFlintNorthMailStop 0-8 G9A11555RockvillePikeRockville,Maryland20852 Mr.R.A.JerveyNRCProjectManagerU.S.NuclearRegulatoryCommission One WhiteFlintNorthMailStop 0-8 G9A11555RockvillePikeRockville,Maryland20852 Enclosure RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT REQUEST ONE-TIME FIVE-YEAREXTENSIONTOTYPEATEST INTERVAL CONTAINMENTTESTAND INSPECTION North Anna Power Station Unit 2 Virginia Electric and Power Company (Dominion)

SerialNo.08-0092ADocketNo.50-339Requestfor Additional InformationOne-TimeFive-YearExtensiontoTypeATestIntervalRESPONSETOREUESTFOR ADDITIONALINFORMATINREGARDINGPROPOSEDLICENSEAMENDMENTREUETONE-TIMEFIVE-YEAREXTENSIONTOTYPEATEST INTERVAL BackgroundTheTypeA Containment IntegratedLeakRate Test(ILRT),theTypeBand Type C Local Leak Rate Tests(LLRT),and Containment Inservice Inspection (CISI)program collectively ensure leak-tight integrity and structural integrityofthe containment.

The NRC staff has determinedthatthe following information is needed to facilitate the reviewofthe Technical Specification (TS)amendment requestforNorth AnnaUnit2 submittedinthe Virginia Electric and Power Company (Dominion) letter dated December 5,2007.NRC Question 1 Please provide a summary list of those containment penetrations (including their test scheduleintervals)thathavenot demonstrated acceptable performance history in accordancewiththe primary containmentleakagerateprogram.

Dominion Response Electrical Penetrations In accordancewiththe guidanceofNEI94-01,Rev0, electrical penetrations with acceptable performancemaybeplacedona10 year testing interval after passing three consecutive refueling outagetests.Ifthe penetrationfailsa test,itis returnedtothe short interval (every outage)until it again passes three consecutive refueling outage tests.Penetration Test Results (Administrative limit>0.0555 scfh)1AO-ring2001-0.0925seth,2002-0scfh,2004-0.012scfh,2005-0.001scfh,2007-0.001scfh (returned to extended interval)1A Canister2005-0.14seth,2007-0.005scfh(twotestsremainuntil eligible for extended interval)4B2007-Interim tailure*,asleft leakage 0 scfh (three tests remain until eligible for extended interval)Page1of26 SerialNo.08-0092A DocketNo.50-339 Request for Additional Information One-Time Five-YearExtensiontoTypeA Test Interval 60 2007-Interim failure*,asleftleakage0scth(threetestsremainuntileligibleforextendedinterval)13A2001-0.0925 sefh,2002-0scfh,2004-0scfh,2005-0.002scfh(returnedtoextendedinterval)16C2004-0.1 sefh,2005-0.004scfh,2007-0.001scfh(onetestremainsuntileligibleforextendedinterval)22A2004-Interim failure*,asleftleakage0.002scfh2005-0.003scfh,2007-0.001scfh(onetestremainsuntileligibleforextendedinterval)22C2004-Interim failure*,asleftleakage0scth2005-0.012scfh,2007-0.001scfh(onetestremainsuntileligibleforextendedinterval)

  • interimfailure-whenthepenetrationbackfillpressureisfoundat0psigduringthemonthlyinspection.Aleaktestisperformedtoconfirmoperability.MechanicalTypeCPenetrationsInaccordancewiththeguidanceofNEI94-01,Rev0,mechanicalpenetrationvalves with acceptableperformancemaybeplacedona60monthtestingintervalafterpassingtwoconsecutiverefuelingoutagetests.Ifthevalvefailsatest,itisreturnedtotheshortinterval(everyoutage)untilitagainpassestwoconsecutiverefuelingoutagetests.Someofthefailuresbelow,whichareindicatedinboldtype,resultedinhighleakagerates,butthecontainmentleakageisbasedonpenetrationminimumpathwayleakage.Inthecasesofhighleakageratestheothervalveinthepenetrationisalsolistedto demonstratetheoverallhealthofthepenetration.PenetrationNo.

I ValveTestResults 12 2-ComponentCooling(CC)-TV-200B6"2001-35 sefh,2002-0scfh,2004-0scfh 14 2-CC-TV-200A 6"2001-24 sefh,2002-0scfh,2004-0scfh"Page2of26AdminLimit2scfh2scfh Penetration No.1 ValveTestResultsSerialNo.08-0092A DocketNo.50-339 Request for Additional Information One-Time Five-YearExtensiontoTypeATestIntervalAdminLimit 312-HydrogenRecombination(HC)-153"1sefh2007-3 seth,Additionaltestingrequired 2-HC-TV-205A 3"1scfh2002->257 seth,2004-1.2sefh,2005-0sefh,2007-0sefhThisvalvedoesnotqualifyforextendedtestinterval.Othervalvestestresultsinpenetration31.2-HC-152002-0sefh3"1sefh 2-HC-TV-205B2002-2.4sefh3"1sefh 2-HC-TV-201A2002-0sefh3"1scfh 2-HC-TV-205B2002-0scfh3"1sefh342-FireProtection(FP)-79 4"1.5sefh2001-29 seth,2002-0.35sefh,2004-0.7seth,2005-0sefh,2007-0sefh,Thisvalvedoesnotqualifyforextendedtestinterval 2-FP-81 4"5sefh2001-3.35scfh,2002-0scfh,2004-7.0 seth,2005-0sefh,2007-0sefh,Thisvalvedoesnotqualifyforextendedtestinterval452-ReaetorCoolant(RC)-TV-2519A3"1sefh2002->257 seth,2004-0sefh, 2005"-0sefh,2007-0scfhOthervalvesinpenetration452-RC-1622002-0sefh 3"1sefh 47 2-lnstrumentAir(IA)-250 2"1scfh,2002->257 seth,2004-0scfh, 2005*-0sefh,2007-36 seth,AdditionaltestingrequiredOthervalvesinpenetration472-IA-TV-202A2002-0sefh2"1sefh 53 2-SafetyInjection(SI)-132 1"1sefh2001-1.4 seth,2002-2.3 seth,2004-0sefh,2005-2 seth,2007-4 seth,Additionaltestingrequired2-SI-TV-200 2"1sefh2002-1.8 seth,2004-0sefh,2005-0scfh,2007-0sefh56C2-SampleSystem(SS)-TV-202A1"2002->257 seth,2004-0sefh,2005-0sefhOthervalvesinpenetration56C2-SS-TV-202B2002-0sefh1"Page3of261sefh1scfh SerialNo.08-0092ADocketNo.50-339Requestfor Additional InformationOne-TimeFive-YearExtensiontoTypeATestInterval 89 2-Vaeuum Priming (VP)-242005->257 sefh, 20070sefh, Additional testing required Other valves in penetration 89 2-SC-TV-203

-2005-0sefh 93 2-HC-TV-206A2007->257 sefh Additional testing required Other valves in penetration 93 2-CV-TV-250A

-2007-0sefh 2-HC-TV-206B

-2007-0sefh 2-CV-TV-250B

-2007-0sefh 6" 6" 2" 2" 2" 2"5scfh5scfh1sefh1sefh1sefh1sefh 94 2-Containment Vacuum (CV)-4 8"2007-6 sefh, Does not qualify for extended test interval 2-CV-TV-200 8"2005-4.5 seth, 2007-7.5 sefh, Does not qualify for extended test interval2.5scfh2.5sefh 97A 2-SS-TV-203B 2005-1.5 sefh, 2007-0sefh, Additional testing required 109 2-HC-TV-207B2005-6.0 sefh, 2007-0sefh, Additional testing required111D 2-Post Accident (DA)-TV-203A2007->257 sefh, Additional testing required Other valves in penetration111D 2-DA-TV-203B 2007-0sefh NRC Question 2 1" 2" 1" 1"1sefh1sefh1sefh1scfhPleaseprovide a summarytableforType BandType Ctests(includingthe intervalscheduledates)thatare plannedtobe performed priortoandduringthe requestedyear extension period oftheILRTinterval.

Dominion ResponseSeethe attached Tables.Page4of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditional InformationOne-TimeFive-YearExtensiontoTypeATestIntervalNRCQuestion3 Regulatory Position C.3 of RG 1.163recommendsthatvisual examinations should be conducted priortoinitiating a Type Atest,andduringtwo otherrefuelingoutagesbeforethenextType Atestbasedon a ten-yearILRTinterval.Pleasedescribe,with aschedule,howyouwouldsupplementthis ten-year interval-basedvisualinspections requirementfortherequested15-yearILRTinterval.DominionResponsePerSection9.2.1ofNEI94-01,Rev0andRegulatoryPositionC.3ofRG1.163thenormalinspectionrequirementsarethreeexaminationsinthe10yearinterval.Two examinationsarerequiredduringthe10yearsintervalwithathirdexamination just priortotheTypeAtest.InaccordancewithNEI94-01,Rev0,ageneralvisualexaminationisperformedoftheaccessibleinteriorandexteriorsurfacesofthecontainmentandcomponentsincludingthelinerplateforstructuralproblemswhichmayaffecteitherthe containment structureleakageintegrityortheperformanceoftheTypeAtest.NorthAnnaUnit2hascompletedthefollowingvisualexaminationsduringthecurrent10yearIntegratedLeakRateTest(ILRT)interval:*February21,2001

  • September18,2002Baseduponapprovalofthe5yearextensiontotheILRTinterval,twoadditional examinationswillneedtobecompleted,oneofwhichwillbeduringtheoutageoftheTypeAtest(October2014).Theotherexaminationwillbescheduledduringoneofthefollowingoutages:
  • September 2008*March2010*September 2011Inadditiontotheseexaminations,generalvisualexaminationsofthe containment linerareperformedinaccordancewiththeIWESectionoftheASMECode.NRCQuestion4Pleaseprovideinformationrelativetothefindings(ifany)andactionstakenwhere existence of or potentialfordegradedconditionsininaccessibleareas of the containmentstructureandmetalliclinerwereevaluated basedonconditionsfoundinPage5of26 SerialNo.08-0092ADocketNo.50-339Requestfor Additional Information One-Time Five-YearExtensiontoTypeATestIntervalaccessibleareas as 10CFR50.55a(b)(2)(ix)(A).

Dominion Responserequiredby10CFR50.55a(b)(2)(viii)(E)andNorthAnnaUnit2hasperformedthisevaluationonceduetoconditionsfoundduringthefall1999refuelingoutage.Asrequiredby 10CFR50.55a(b)(2)(viii)(E) and1OCFR50.55a(b)(2)(ix)(A),aconditionreportwasmadeintheNorthAnnaUnit2'sInserviceInspectionSummaryReportfortheFall1999refuelingoutagedatedJanuary3,2000(SerialNo99-0618).Theapplicablepagesfromthisreportareattached.Thereportdetailsthefindingsandactionstaken.

NRC Question 5InSection 4.6 of Attachment 1totheTSamendmentrequest,itisstatedthat,inthefirstten-yearinterval of IWE examinations,theareasassociatedwiththelinerdamagecausedbywoodleftintheconcreteatconstructionhavebeenultrasonicallyexamined(augmentedCategoryE-C examination).Pleaseprovide a summary ofareasotherthanwherelinerdamagewascausedduetowoodleftintheconcretethathavebeenidentifiedforaugmentedexamination(ifany).

ItisalsostatedthatnoaugmentedCategoryE-Cexaminationsoftheareasassociatedwiththelinerdamagecausedbywoodleftintheconcreteareplannedforthesecondten-year intervallWE examinations since severalexaminationshaveshownnochangeinlinerthickness.Inlight of the proposed TS Amendmenttoallowfive-yearextension of Type Atestinterval,pleaseprovidespecificinformationtojustifydiscontinuingtheaugmentedexamination ofsuspectlinerarea(s)duringthesecondten-yearIWEinterval.

Dominion ResponseNorthAnnaUnit2alsoperformedan(UT-thicknessandvisualVT-1)augmentedexamination(CategoryE-C)onthelinerattheconcretefloorinterfacedescribedinthereportprovidedinNRCQuestion4.Theexaminationwasperformedinthegeneralareaoftheoriginallowpointinanaccessibleregionnearthelinertofloorinterfacetoobserveanypossiblegeneraldegradation.

The discontinuanceoftheCategoryE-CexaminationswasbaseduponASMESectionXI,2001Editionthroughthe2003Addenda(2ndIntervalCodeofreference),IWE-2420(c),whichstates:"WhenthereexaminationsrequiredbyIWE-2420(b)revealthattheflawsorareasofdegradationremainessentiallyunchangedforthenextinspectionperiod,theseareasnolongerrequireaugmentedexaminationinaccordancewithTableIWE2500-1,ExaminationCategoryE-C."-Note:ThecodePage6of26 SerialNo.08-0092ADocketNo.50-339Requestfor Additional Information One-Time Five-YearExtensiontoTypeATestIntervalchangedinthe1998Edition"tounchangedforthenextinspectionperiod."Itpreviouslyrequirednochangeinthreeconsecutiveperiods.Theoriginalconditionswerediscoveredduringthefall1999refuelingoutage(period1).CategoryE-Cexaminationsforeachlocationwereperformed subsequentlyonthefollowingdates:

  • VT-1-03/12/01(period 1),05/18/04(period2),and03/20/07(period3)*UT-thickness-03/16 and19/01(period1),10/11/05(period2),and03/22/07(period3)Noevidenceofcontinueddegradationhasbeenobservedatanyofthelocationsasevidencedbytheexaminationsperformed,andCategoryE-C examinationshavebeen discontinuedattheselocationsbaseduponIWE-2430(c).NootherCategoryE-C examinationshavebeenplanned.

NRC Question 6 Please provide a summary ofanydegradationidentifiedduring past inspection of the containment moisture barrier(e.g.,betweenlinerandconcretefloor)?

If any, pleasedescribethecondition,correctiveactions,and additional monitoring program.Dominion ResponseThelinerisinstalleddirectlyontopofthe10'thickbasematandthe2'6" containmentfloorslabpoursarepoureddirectlyontopoftheliner.Therearenomoisturebarriersaroundtheperimeterofcontainmentatthelinertofloorinterface.Polysulfidesealantisusedfor"waterstops"betweenthecontainmentfloorslabpourstopreventmoisturefromgettingbetweentheslabpoursandunderneaththefloor.Thecontainmentfloorslabsaretightagainstthelinerandslopedtowardsthecenterofcontainment.No"moisturebarrier"isusedbetweenthelinerandcontainmentfloorattheperimetereitheraboveorbelowthecontainmentfloorsurface.TheNAPSUnit2containmentdesigndoesnotincludeamoisturebarrieratexaminationareaC-DasindicatedonASMEXIFig.IWE-2500-1.InMarch1999duringageneralvisualexaminationofthecontainmentliner,relevantindications(minorrustatthefloortolinerinterface)wereobservedbetweencolumns 11and13.Fourareasattheinterfacevaryingfrom4inchesto24incheswereexcavatedbychippingconcreteawayfromthelinerfloor.Intheexcavatedareas,therustonthelinerwasnotthickortightlyadhered.Wallthicknessmeasurementsweremadeina2x2inchgridpatternalongtheexcavationsandthenominal0.385"linerthicknessvariedfrom0.365"to0.400"indicatingthatlittlewalllosshadoccurred.Page7of26 SerialNo.08-0092A Docket No.50-339 Request for Additional Information One-Time Five-Year ExtensiontoTypeA Test IntervalAlsoinMarch1999,onelocation210"fromcolumn6 about1/4"wideby1"long exhibitedawall thicknessaslowas0.282inchesbutitwas visually evident that therewaslittleornowalllossontheinsideoftheliner.This indication was attributed to localized thinningonthe outsideofthelinersuchasmayhavebeencausedbya gouge during erection.Thislocalizedlowareawas evaluated and determinedtobe acceptable.

VT-1 examinations were completedonthisareainMarch2001,May2004andMarch2007and UT examinations were completedinMarch2001, October 2005andMarch2007.No evidence of further degradationwasnotedinthisarea.

NRC Question 7Relativetotheresults of 1999 ILRT includedinSection 4.2 of Attachment 1totheTS amendmentrequest,thereappearstobe a typographical errorinthetotalvalueof.

Please review anddiscuss.Also,providethe actual as-left leakage forthelastthree Type A tests.Dominion ResponseThe"totalleakage"valueforthe October1999testwas incorrectlystatedinSection4.2.

The correctresultsforthe October1999testareprovidedbelow.

A design leakagecriterionfortheNorthAnnaUnit1and2 containment structuresis0.1wt.%/24hoursor1.0 Lawhichis304.4seth.10CFR50 Appendix JtestingcriteriaforTypeB&C testingare0.6 Laor182.6scfhandTypeA testcriteriais0.75 Laor228.3scfh.The following providestheas-leftleakagevaluesforthelastthreeTypeAtests:Unit2TypeATestHistoryApril1989 October 1990 October 1999 Measured Leakage 0.24 La 0.20 La 0.450 LaUCLMargin 0.03 La 0.03 La 0.004 La Non-vented Penalties 0.040 La Totals"AsLeft" 0.27 La 0.23 La 0.494 La Leakage Savings 0.090 La Totals"AsFound" 0.584 La NRC Question 8 As summarizedinSection 4.2 of Attachment 1totheTS amendmentrequest,the1999 ILRT as-foundleakagewasmorethantwicethevalue of 1990 ILRTresults.Please provide further informationrelativetothe potential root causeforthisincrease.Also,Page8of26 SerialNo.OB-0092ADocketNo.50-339RequestforAdditional Information One-Time Five-YearExtensiontoTypeATestInterval providetheTypeB and Type C test results and their comparisonwiththe allowable leakage rate specifiedinthe plant Technical Specifications.

Dominion ResponseManyfactorsmayaffecttheresultsofaTypeAtest.*The fundamentalapproachtotestinghaschangedsince1995.Priortests extensivelydrainedandventedsystems.SinceOptionB,the containment isbottledupandtheintentistomeasureleakagefromthestructure,notfromleakagepathsthatarealreadyincludedintheLLRTprogram.*Integratedleakageratesarenot trendablesincetherearemany variations asfollowsin conductingthetestandanalyzingthedata.Ingeneral,thelongerthetest,thelowerthefinalreported containmentleakagerate.Thelengthofstabilizationperiodcanaffectthefinalreported containmentleakagerate.

Olderteststendedtouselongerstabilizationtimesandthusmayreportlower containmentleakagerate.*Typically, containmentleakageratesstartnearorabovetheTSlimitand slowly decreaseovertime.Toarriveatthefinaltrueleakageratemayrequireconductingthetestfor24hoursorlonger.TheBN-TOP-1totaltimeusesa97.5%upper confidencelimitversus95%formasspoint.Thus,tests conductedwithtotaltimedataanalysistendtoreporthigher containmentleakagerates.Thefollowingaresomespecific examplesofthevariablesthatcanoccurfromtesttotestandcause variationsindatapoints.ILRTComparisonDataForLengthOfTimeRequiredForTestCompletion.Unit21989Unit11993Unit21999Unit12007Pressurization11.5hr11.8hr11.3hr8.5hr Stabilization13.2hr5.2hr5.35hr5.0hrTestPeriod24hr34.0hr8.15hr8.0hr Verification5.75hr4.35hr5.63hr4.0hr Depressurization14hr16.0hr7.8hr5.9hr Totals69.2hr71.8hr38.3hr33.5hrPage9of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditional Information One-Time Five-YearExtensiontoTypeATestInterval As requested, the following providetheUnit2 October 1999 Type B&C Leak Rate Test History: As-FoundMinPath As-LeftMaxPath As-LeftMinPath Piping Penetrations PersonnelAirLock Emergency EscapeAirLock Electrical Penetrations Equipment Hatch Fuel Transfer TubeTotalLocal Leak Rate 3.825 scfh5scfh3.5scfh 0.356 scfh 0.125 scfh o scfh 12.806 scfh 15.225 scfh 5scfh4.5scfh 0.712 scfh o scfh Oscfh 25.437 scfh1.52scfh2.5scfh 2.25 scfh 0.356 scfh o scfh o scfh 6.626 scfh The instrument error associatedwiththistestingwas:+/-0.0921scfh NRC Question 9InSection 4.6ofAttachment 1totheTSamendment request,itisstatedthatinthesecondfive-yearIWLexaminationofNorthAnnaUnit 2containmentstructure(completedinAugustof2007)severalpiecesofembeddedmaterialwereidentified.Pleasediscussthetypeandtheextentofconcreterepair,andiftherewasanylinerdamageassociatedwiththiscondition.

Furthermore,pleasediscussiftherehasbeen acompletedirectinspectionoftheNorthAnnaUnit 2containmentstructure.

Dominion ResponseTheUnit2 Containment Concrete IWL inspections were performed locallywiththeuseofa craneandman basket for approximately 80 percentofthe containment and remotelyforthe remaining 20 percentdueto safety concerns around the safety valve discharge stacks.The inspections were completed in August2007.Nine locations were foundontheUnit2 Containmentthatwere suspect and require excavation to determine the extent of condition.Sixwereonthedomeandthreewereontheshell.Todate,five locations,threeontheshellandtwoonthedome,havebeen excavated leaving four additional locations to excavate.Two locations excavated are below thefaceof reinforcementwithsmall diameter bars exposedandwill requireaCoderepair.

The condition, though requiringrepair,isnot considered significant nor does it affect containment integrity.

The other three locations excavatedarenot deep enoughtobe consideredcoderepairs.The maximum depthofthefive excavationsis6" deep in small areasandassuchdonot jeopardize the structural integrityofthe containment.

The remaining four locationstobe excavatedarenot expectedtobe any deeper than those already excavated.

Consequently, the repaircanbe performed when support (personnel and crane)and environmental conditionsaremore optimal.These repairs are currently scheduled for repairinthe summerof2008.Page10of26 SerialNo.08-0092ADocketNo.50-339Requestfor Additional Information One-Time Five-YearExtensiontoTypeATestIntervalAsallexcavationstodatearerelativelyshallowwithrespecttothethicknessoftheconcretecontainment,nolinerdamagehasoccurredandnoneisexpectedfollowingthecompletionoftheremainingfourexcavations.ConcreterepairoftheexcavationsfoundtoextendbeyondthefaceofthereinforcementwillbecontrolledunderanlSI Repair/ReplacementPlan.Otherconditionscorrectedwillbetreatedasmaintenance(non-lSI)activities.Essentiallybothtypesofrepairswillbethesameasfarastheconcreteisconcerned.Theexcavationswillbeprepared,cleaned,pre-soaked,groutedandproperlycured.

NRC Question 10 Ifbellowsare usedonpenetrationsthroughcontainment pressure-retaining boundariesatNorthAnnaUnit 2,pleaseprovideinformationontheirlocation,inspection,testingandoperatingexperiencewithregardtodetection ofleakagethroughthe penetration bellows.Dominion ResponseThesinglefueltransfertubeforeachofthetwoNorthAnnacontainment structures aretheonlypenetrationsthatutilizeabellowsarrangementtoestablishsealsbetweenthecontainmentliner,transfercavity,spentfuelpool,andthepenetrationitself.Pressuretestchannelsareinstalledontheweldinterfacebetweenthepenetrationpipingandthecontainmentlinerandwereusedtoverifyweldqualityduringinitialconstruction.Therearenoothertestdevicesinstalledonthepenetrationpipingandbellows.Therefore,theabilitytoperformlocalleakratetestingisnotavailable.PenetrationintegrityisverifiedduringtheperformanceoftheIntegratedLeakageRateTest(TypeA).NorthAnnahasnorecordofbellowsleakage.Visualinspectionisimpossiblebecausetwoofthethreebellowsareenclosedinsleevesinthefuelbuildingandbetweenthefuelandcontainmentbuildings.Thethirdbellowsislocatedbetweenthecontainmentandthefueltransfercanal,whichisathreefootopening,coveredbypermanentshielding.

NRC Question 11 Please provideanoverview of the containmentlinercoatinginspection program atNorthAnnaUnit 2includinginspectionintervals,findings andcorrectiveactions identifiedduringrecentinspections.

Dominion ResponseEngineeringvisuallyinspectstheaccessibleareasofthecontainmentlinercoatingeachrefuelingoutagelookingforindicationsofcoatingdamage.Indicationsofcoatingdamageincludecracking,peeling,wear,mechanicaldamage,andblisters.The inspection takesplaceasearlyasreasonablypossible,usuallywithinthefirstfewdays Page 11of26 SerialNo.08-0092ADocketNo.50-339Requestfor Additional InformationOne-TimeFive-YearExtensiontoTypeATestIntervaloftheoutage.Coatingdefects,alongwithlocations,arerecorded,and Engineering determineswhichareasrequirerepair.AConditionReportis generatedforthe inspectionresults.Repairsare generallycompletedduringthesameoutage,withblistersreceivingthehighestpriority.

Mechanical damagetocoatingis typicallycausedfromtheimpactof transient material (e.g., scaffolding)asworkersmovethematerialstothedesiredlocation.

Whenever thelinerisexposedandrepairisneeded,theareaisscheduledtoberecoated.Ifidentifiedrepairareascannotbecompletedduringthecurrentoutagedueto schedule constraintsorinaccessibility,anEngineeringReviewis conducted,therepairs are re-scheduledfornextrefuelingoutage,andaConditionReportiswritten.Thethreemostrecent inspectionsoftheNorthAnnaUnit2 containmentlinercoating (May 2004, October 2005andMarch 2007)yielded indications of mechanical damage, coating delamination,andseveralblisters.Allidentifiedblisterswere investigated andexcavatedthesameoutageastheywerediscovered.When delamination is discovered, any adjacentloosecoatingwasremoved.

NRC Question 12 In Section 4.6 of Attachment 1totheTS amendmentrequest,the following is stated: The second ten-year interval IWE programforNorth Anna meets the requirements ofthe2001Editionthroughthe2003 Addenda of ASMESectionXI.

Categories E D andGareno longer part ofthecode.The relief requestsaboveare not neededforthe second ten-year interval since examination of seals and gaskets, and bolt torque ortensiontestsareno longer addressed by ASMESectionXI.

Assuch,the extension requestwillno longer impact the ASMESectionXI program upon second interval start foreachunit.Giventhe short time period remaininginthefirst ten-yearIWElSI intervalfortheNorth Anna units, andtheType Band C tests performed duringthefirst ten-yearIWElSIinterval,the AppendixJ,Type A extensionisseen as having a negligible impact." Please provide clarificationforthefollowing:

a.TheTS Amendment request submitted in Dominion letter dated December 5, 2007 is for North Anna Unit 2.Itis not cleartotheNRC staffwhybothunitsare being discussedintheabove paragraph.

b.Please discuss the examinationmethodes)inNorthAnnaUnit 2 to ensure leak tight integrity of those penetrationswithsealsandgaskets, and bolted connections.

c.Please clarify the last sentence of the subject paragraph(Giventhe short time period remaining*).Page12of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditional InformationOne-TimeFive-YearExtensiontoTypeATestInterval Dominion Responseto12aThesecondtenyearIWEprogramsareidenticalforbothNorthAnnaUnit1and2.The introductorysentenceintheparagraphincludedadiscussionofbothunits.The.extensionrequestisforUnit2only.

Dominion Responseto12b CategoryE-D(seals,gaskets,andmoisturebarriers) examinations were alternativelyaddressedbyrequestRR-IWE2approvedbyNRCletterdatedApril21,1999(firstyearinterval).ThealternativeaddressedItemNos.E5.10(seals)andE5.20(gaskets).NorthAnnaUnit2hasnoItemNo.E5.30(moisturebarriers)items.The alternativebasistakescreditfortheAppendix J,TypeBtestto adequatelyaddressthe integrity ofthesealsandgaskets.TheAppendix J,TypeBtestremains unaffectedbytheproposedAppendix J,TypeAtestfrequencyextensionandcontinuestoensuretheintegrityofthesealsandgaskets.CategoryE-G(pressureretainingbolting)examinationswere alternatively addressed byrequestRR-IWE5approvedbyNRCletterdatedApril21,1999(first ten-year interval).ItemNo.E8.10wasnotaddressedbythealternativerequirementandtherequired visual VT-1 examinationshavebeenperformedinaccordancewiththecode.ItemNo.E8.20requiredabolttorqueortensiontestandwasthesubjectofthe alternativerequest.The acceptabilityofthealternativerequestwasbaseduponthe Appendix J,TypeBtestwhichindirectlyprovedtheadequacyofthebolttorqueortensionby maintaining acceptableleakrates.TheAppendixJ,TypeBtestremains unaffected bytheproposedAppendixJ,TypeAfrequencyextension.Theproposedalternatives,the visual VT-1 examinationsandtheacceptableperformanceofAppendixJ,TypeBtestscontinuetoensureboltingintegrity.Alltestingisperformedusingthe"Make-up"methodandevaluatedagainststation established administrativelimits.Ifanyofthelimitsareexceeded,thenan engineeringevaluationisperformedandrepairscompletedifnecessary.*Equipmenthatch,escapeairlock,andinterfacebetweentheairlockandhatch-TheescapeairlockispressurizedtoP a which simultaneouslytestsdoorseals,actuationrodpenetrations,electricalpenetrations,andportholes.The equipmenthatchandinterfaceareequippedwithadoubleo-ringsealandthetestpressureisappliedbetweenthetwoo-rings.*Thefueltransfertubeissealedinsidethecontainmentbuildingwithablindflange, equippedwithadoubleo-ringseal.Testpressureisappliedbetweenthetwo o-rings.*ThepersonnelairlockispressurizedtoP a which simultaneouslytestsdoorseals,actuationrodpenetrations,electricalpenetrations,andportholes.Page13of26 SerialNo.08-0092ADocketNo.50-339Requestfor Additional Information One-Time Five-YearExtensiontoTypeATestInterval*AllelectricalpenetrationsareoftheConaxdesign,utilizingadoubleo-ringtosealtheflangeanddoublecompressionsealsforthefeed-throughs.NorthAnnamaintainsapproximately20psiofheliumpressureonthesealsatalltimes.Thesepressuresaremonitoredonamonthlybasisandrechargediflow,andType Bleaktestedifzero.

Dominion Responseto12cTheremainingexaminations(visual,VT-3)forNorthAnnaUnit2areassociatedwithwettedsurfacesofsubmergedareas(ItemNo.E1.12CategoryE-A,ASME2001Editionthroughthe2003Addenda).Theseexaminationsarescheduledforcompletionbytheendofthefall2008refuelingoutage.TheType BandCtestingwillcontinueduringtheextensioninaccordancewithNEI 94-01, Rev.1ensuringtheintegrityofthepenetrations.Page14of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditional Information One-Time Five-YearExtensiontoTypeATestInterval TABLE TYPE BAND C PENETRATIONSTESTSCHEDULEDURINGTHE5-YEAREXTENSIONPage15of26 Electrical PenetrationsSerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformationOne-TimeFive-YearExtensiontoTypeATestInterval History&Testingrequired (outage):UNIT2ELECTRICAL PENETRATION EVALUATION ELECTRICAL Fall Fall FallFORNORTHANNAILRTFIVEYEAR EXTENSION PENETRATION NO.20082010201120132014 1A O-rinoNTNTNTNTT 1A Canister F2 F3NTNT NT 18O-rinaNTNTNTNT T Testing Required Codes: 18 CanisterM,T NTNTNT NTT-TYPEBSCHEDULE 1CO-rinoNTNTNTNT TF-FAILURE 1CCanisterM,TNTNTNT NTM-MAINTENENCE 10 O-rino NTNTNTNT TD-DESIGNCHANGE 10 CanisterM,TNTNT NT NTNT-NOTTESTEDDURINGOUTAGE 1E Ovrinq NTNTNTNT TF(n)-Testfollowingpreviousfailure 1E Canister NTNTNTNTTNORMALFREQUENCYEVERY6TH OUTAGE 2A NTNTNTNT T 28 NTNTNTNT T 2C NTNTNTNT T 20 NTNTNTNT T 2E NTNTNTNT T 3ANTNTNTNT T 38 NTNTNTNT T 3C NTNTNTNT T 30 NTNTNTNT T 3E NTNTNTNT T 4A NTNTNTNT T 48 F1F2F3NT NT 4C NTNTNTNT T 40 NTNTNTNTT 4E NTNTNTNT T 5A NTNTNTNT NT 58 NTNTNTNT NT Page16of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformationOne-TimeFive-YearExtensiontoTypeATestInterval History&Testing required (outage): UNIT 2 ELECTRICAL PENETRATION EVALUATION ELECTRICAL Fall Ispring Fall Ispring Fall FOR NORTH ANNA ILRT FIVE YEAR EXTENSION PENETRATION NO.2008 2010 2011 2013 2014 5C NT NT NT NT NT 50NTNT NT NT NT 5E NT NT NT NT NT Testing Required Codes: 6A NTNTNT NT NTT-TYPE B SCHEDULE 68 NT NTNTNTNTF-FAILURE 6C NT NT NT NT NTM-MAINTENENCE 60 F1 F2 F3 NT NTD-DESIGN CHANGE 6ENTNTNTNT NT NT-NOT TESTED DURING OUTAGE 7ANTNTNTNT NT F(n)-Test following previous failure 78NTNTNTNT NT NORMAL FREQUENCY EVERY 6TH OUTAGE 7C NT NTNTNT NT 70 NT NTNTNT NT 7ENTNTNTNT NT 8ANTNTNTNT NT 88NTNTNTNT NT 8C NT NT NT NT NT 80 NT NTNTNT NT 8E NT NTNTNT NT 9A T NT NT NT NT 9B T NTNTNT NT 9C T NT NT NT NT 90 T NT NT NT NT 9E T NTNTNT NT 10A T NT NT NT NT 10B T NT NT NT NT 10C T NTNTNT NT 100 T NT NT NT NT 10E T NT NT NT NT 11 A T NT NTNTNTPage17of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformationOne-TimeFive-YearExtensiontoTypeATestInterval History&Testingrequired(outage):UNIT2 ELECTRICAL PENETRATION EVALUATION ELECTRICAL Fall 1:;pring Fall FallFORNORTHANNAILRTFIVEYEAREXTENSION PENETRATION NO.2008 2010 201120132014 118 T NT NT NT NT 11C T NT NT NT NT 110 T NTNTNT NT 11 E T NTNTNT NT Testing Required Codes: 12A T NTNTNT NTT-TYPEB SCHEDULE 128 TNTNTNTNTF-FAILURE 12C TNTNTNT NTM-MAINTENENCE 120 T NT NT NT NTD-DESIGNCHANGE 12E TNTNTNTNTNT-NOTTESTEDDURINGOUTAGE 13A NT TNTNT NTF(n)-Testfollowingpreviousfailure 138 NT TNTNT NT NORMAL FREQUENCYEVERY6TH OUTAGE 13C NT TNTNT NT 130 NT T NT NT NT 13E NT TNTNT NT 14A NT TNTNT NT 148 NT TNTNT NT 14C NT T NT NT NT 140 NT TNTNT NT 14E NT T NT NT NT 15A NT TNTNT NT 158 NT TNTNT NT 15C NT T NT NT NT 150 NT TNTNT NT 15E NT T NT NT NT 16A NT TNTNT NT 168 NT T NT NT NT 16C F3NTNTNT NT 160 NT T NT NT NT 16E NT TNTNT NTPage18of26 Serial No.OB-0092A Docket No.50-339 Request for Additional Information One-Time Five-Year Extension to TypeATest Interval History&Testingrequired(outage):UNIT2ELECTRICALPENETRATIONEVALUATION ELECTRICAL Fall bpring Fall FallFORNORTHANNAILRTFIVEYEAREXTENSION PENETRATION NO.20082010201120132014 17A NT NTTNT NT 178NTNT T NT NT 17C NT NT T NT NT 170 NTNTTNT NT 17E NT NT T NT NT Testing Required Codes: 18A NT NT T NT NTT-TYPEBSCHEDULE 188 NT NT T NT NTF-FAILURE 18C NT NT T NT NTM-MAINTENENCE 180 NT NT T NT NTD-DESIGNCHANGE 18ENTNTTNT NTNT-NOTTESTEDDURINGOUTAGE 19A NT NTTNT NTF(n)-Testfollowingpreviousfailure 198 NT NTTNT NT Testing Required Codes: 19C NT NT T NT NTNORMALFREQUENCYEVERY6TH OUTAGE 190 NT NTTNT NT 19E NT NTTNT NT 20ANTNTTNT NT 208 NT NTTNT NT 20C NTNTTNT NT 200 NT NTTNT NT 20E NT NTTNT NT 21A NTNTNT T NT 218 NT NT NTTNT 21C NTNTNTTNT 210 NT NT NTTNT 21E NT NT NTTNT 22A F3 NTNTNT NT 228 NT NT NT T NT 22C F3 NTNTNT NT 220 NT NT NT T NTPage19of26 Serial No.08-0092A Docket No.50-339 Request for Additional Information One-Time Five-Year ExtensiontoTypeATest Interval History&Testingrequired(outage):UNIT2ELECTRICALPENETRATIONEVALUATION ELECTRICAL Fall Fall FallFORNORTHANNAILRTFIVEYEAREXTENSION PENETRATION2010201120132014 NO.2008 22ENTNTNT T NT 23ANTNTNT T NT 238 NT NT NT T NT 23CNTNTNT T NT 23D NT NT NT T NT Testing Required Codes: 23ENTNTNT T NTT-TYPEBSCHEDULE 24ANTNTNT T NT F-FAILURE 24A M,TNTNTNTNTM-MAINTENENCE 248 NTNTNT T NT D-DESIGNCHANGE 248M,T NTNTNTNTNT-NOTTESTEDDURINGOUTAGE 24CNTNTNT T NT F(n)-Testfollowingpreviousfailure 24DNTNTNT T NT Testing Required Codes: 24E NT NT NT T NTNORMALFREQUENCYEVERY6TH OUTAGE 24ENTNTNT T NT F1NTNTNT T NTPage20of26 Mechanical PenetrationsSerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformationOne-TimeFive-YearExtensiontoTypeATestInterval Required TestingUNIT2 MECHANICAL PENETRATION VALVEFallSpring Fall Spring Fall PENETRATION EVALUATION FUNCTION PEN FOR NORTHANNAILRT NO.NUMBER2008201020112013 2014FIVEYEAR EXTENSIONMarch19,2008CCFMBRHRHX1 2-CC-TV-203B NTNTCNT NT NORMAL FREQUENCYEVERY3RDCCTOARHRHX2 2-CC-194CNT NT C NT OUTAGE Testing Required Codes:CCTOBRHRHX4 2-CC-199 NT NT C NT NTC-TYPEC SCHEDULECCFROMARHRHX5 2-CC-TV-203ANTNTC NT NT(C)-EVERY OUTAGECCFROMRCP 8 2-CC-TV-2018NT CNTNTC THERMAL BARRIERM-MAINTENANCE 2-CC-TV-201A NT CNTNTCF-FAILURECCTOC CARF 9 2-CC-302CNT NT C NTD-DESIGN CHANGECCTOBCARF10 2-CC-289 CNTNT C NTOR-REQUESTEDBYOPSCCTOACARF11 2-CC-276 CNTNTC NTNT-NOT TESTEDCCFROM"8"12 2-CC-TV-205BCNTNTC NTF(n)-Test following previous failure CARF 2-CC-TV-200BMNTNTC NTCCFROM"C"13 2-CC-TV-205CNTCNT NT C CARF 2-CC-TV-200CNTCNTNTC AcronymsCCFROM"A"14 2-CC-TV-205A CNTNTC NTCC-Component Cooling Water CARF 2-CC-TV-200A M,TNTNT C NTRHR-Residual Heat RemovalCCTOCRCP16 2-CC-152NTNTCNT NTRCP-Reactor Coolant Pump2-CC-TV-204CNTNTCNTNTCARF-ContAir Recirculation FanCCTOBRCP17 2-CC-115NTNTCNTNT RWST-Refuel Water Storage Tank 2-CC-TV-204B NT CNTNTCHC-Hydrogen RecombinationCCTOARCP18 2-CC-78 CNTNTCNTPRT-Pressurizer Relief Tank 2-CC-TV-204AMNTNTCNTQS-Quench Spray System SEAL WATER FROM 19 2-CH-331CNTNTCNTRS-Recirculation Spray System RCPs 2-CH-MOV-2380M,TNTNTCNTRSHX-Recirculation Spray Heat Exchangers 2-CH-MOV-2381 M,T NT NT C NTCV-Containment Vacuum System ACCUMULATOR 20 2-SI-136 NT GNTNT GLM-Containment Leakage MAKEUP Monitoring System 2-SI-47NTCNTNTCPage21of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformation One-TimeFive-YearExtensiontoTypeATestInterval Required TestingUNIT2 MECHANICAL PENETRATION VALVE Fall Spring Fall Spring Fall PENETRATION EVALUATION FUNCTION PENFORNORTHANNAILRT NO.NUMBER20082010 2011 2013 2014FIVEYEAR EXTENSIONMarch19,2008RHRTO RWST 24 2-RH-37NTNTCNTNT 2-RH-38NTNT CNTNT NORMAL FREQUENCYEVERY3RD OUTAGECCFROMARCP25 2-CC-TV-202F M,TNTNTC NT Testing Required Codes: 2-CC-TV-202ECNTNTCNTC-TYPECSCHEDULECCFROMCRCP 26 2-CC-TV-202BM,TNTNTCNT(C)-EVERYOUTAGE 2-CC-TV-202ACNTNTCNTM-MAINTENANCECCFROMBRCP27 2-CC-TV-202D M,TNTNT C NTF-FAILURE 2-CC-TV-202C CNTNT C NTD-DESIGN CHANGE LETDOWN 28 2-CH-TV-2204A M,TNTNTCNTOR.REQUESTEDBYOPS 2-CH-TV-2204BCNTNT C NTF(n)-Testfollowingpreviousfailure HC SYSTEM 31 2-HC-15F1F2NTNT C 2-HC-TV-205ANTNTCNTNT 2-HC-TV-205BNTNTCNTNT 2-HC-TV-201ANTNTCNTNT 2-HC-TV-201 B NTNTCNTNT WET LAYUPASG32 2-WT-437NTCNTNT C 2-WT-446 NTCNTNTNC PRIMARY DRAIN 33 2-DG-TV-200B M,TNTNTCNT TRANSFER 2-DG-TV-200A C NTNTC(NT FIRE PROTECTION 34 2-FP-79(C)(C)(C)(C)

©2-FP-81 (C)(C)(C)(C)(C)

SUMP DISCHARGE 38 2-DA-TV-200B(C)(C)(C)(C)(C)2-DA-TV-200A (C)(C)(C)(C)(C)A BLOWDOWN 39 2-BD-TV-200B(C)(C)(C)(C)(C)2-BD-TV-200A (C)(C)(C)(C)(C)C BLOWDOWN 40 2-BD-TV-200F(C)(C)(C)(C)(C)2-BD-TV-200E (C)(C)(C)(C)(C)B BLOWDOWN 41 2-BD-TV-200D (C)(C)(C)(C)(C)

Page 22 of 26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformation One-Time Five-YearExtensiontoTypeATestInterval Required TestingUNIT2MECHANICAL PENETRATION VALVE Fall 8pring Fall 8pring Fall PENETRATION EVALUATION FUNCTION PENFORNORTHANNAILRT NO.NUMBER 2008 2010 2011 2013 2014FIVEYEAR EXTENSION March 19, 2008 B BLOWDOWN (cont.)2-BD-TV-200C(C)(C)(C)(C)(C)NORMALFREQUENCYEVERY3RD SERVICEAIR42 2-8A-123NTNTCNTNT OUTAGE 2-8A-65NTNTCNTNT AIR MONITOR 43 2-IA-428 M,TNTNTC NTTestingRequiredCodes:

2-RM-TV-200ACNTNTC NTC-TYPECSCHEDULE AIR MONITOR 44 2-RM-TV-200CNTCNT NT C(C)-EVERYOUTAGE2-RM-TV-200B NT CNTNTCM-MAINTENANCE PRIMARY GRADE 45 2-RC-162CNTNTC NT WATERF-FAILURE 2-RC-TV-2519A CNTNT C NTD-DESIGNCHANGE INSTRUMENTAIR47 2-IA-250F1F2CNT NTOR-REQUESTEDBYOPS 2-IA-TV-202A CNTNT C NTNT-NOTTESTED PRIMARY VENT 48 2-VG-TV-200BNTCNTNTC HEADERF(n)-Testfollowingpreviousfailure 2-VG-TV-200ANTCNTNTCN2TO PRIMARY 50 2-81-HCV-2936M,TNTNTCNT RELIEF TANK2-81-TV-201 CNTNT C NT 53 2-81-132 F1 F2NTNT C 2-81-TV-200 CNTNT C NT PRIMARY VENT POT 54 2-DA-7NTNTCNTNT VENT 2-DA-9NTNT CNTNT LEAKAGE 55D 2-LM-TV-200FNTNT CNTNT MONITORING 2-LM-TV-200E NTNTCNTNT PZR LIQUID 8PACE 56A 2-88-TV-200ACNTNT C NT 2-88-TV-200BM,TNTNTCNTHOTLEG56B 2-88-TV-206A NTNTCNTNT 2-88-TV-206BNTNT CNTNT COLD LEG 56C 2-88-TV-202ANTCNTNT C 2-SS-TV-202B NT CNTNT C 8G BLOWDOWN 56D 2-88-TV-212A NTCNTNTCPage23of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformation One-TimeFive-YearExtensiontoTypeATestInterval Required TestingUNIT2 MECHANICAL PENETRATION VALVE Fall Spring Fall Spring Fall PENETRATION EVALUATION FUNCTION PENFORNORTHANNAILRT NO.NUMBER 2008 2010 2011 2013 2014FIVEYEAR EXTENSIONMarch19,2008 SG BLOWDOWN (cont)2-SS-TV-212B NT CNTNTC LEAKAGE MONIT 57A 2-LM-TV-200HNTNTCNTNT NORMAL FREQUENCYEVERY3RD 2-LM-TV-200GNTNT CNTNT OUTAGEPRTGAS SPACE 57B 2-SS-TV-204A M,TNTNT C NT 2-SS-TV-204BCNTNTC NT Testing Required Codes: PZR VAPOR SPACE 57C 2-SS-TV-201A M,TNTNTCNTC-TYPEC SCHEDULE 2-SS-TV-201 B M,TNTNT C NT(C)-EVERYOUTAGEOSPUMPB63 2-0S-22M,TNTNTCNTM-MAINTENANCE 2-0S-MOV-201 BCNTNTCNTF-FAILUREOSPUMPA64 2-0S-11 M,TCNTNTCD-DESIGNCHANGE 2-0S-MOV-201 ACCNTNTCOR-REQUESTEDBYOPS SW TO/FROM 79 2-SW-MOV-203D NTNTCNTNTNT-NOTTESTED RSHX'S 80 2-SW-MOV-203CNTNTCNTNTF(n)-Testfollowingpreviousfailure RSHX'S 81 2-SW-MOV-203B M,TNTNTCNT RSHX'S 82 2-SW-MOV-203AM,TNTNT C NT RSHX'S 83 2-SW-MOV-204ACNTNT C NT RSHX'S 84 2-SW-MOV-204B M,TNTNTCNT RSHX'S 85 2-SW-MOV-204CNTNTCNTNT RSHX'S 86 2-SW-MOV-204D NTNTCNTNT AIR EJECTOR 89 2-VP-24 F2NTNTCNT DISCHARGE TO CONTAINMENT 2-SV-TV-203 M,T NTNTCNT CONTAINMENT 90 2-HV-MOV-200C(C)(C)(C)(C)(C)PURGE 2-HV-MOV-200D(C)(C)(C)(C)(C)EXHAUST 2-HV-MOV-201(C)(C)(C)(C)(C)CONTAINMENT 91 2-HV-MOV-200A(C)(C)(C)(C)(C)PURGE 2-HV-MOV-200B(C)(C)(C)(C)(C)SUPPLY 2-HV-MOV-202(C)(C)(C)(C)(C)CVPUMP SUCTION 92 2-HC-TV-204ACNTNTCNTPage24of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformation One-Time Five-YearExtensiontoTypeATestInterval Required TestingUNIT2 MECHANICAL PENETRATION VALVE Fall Spring Fall Spring Fall PENETRATION EVALUATION FUNCTION PENFORNORTHANNAILRT NO.NUMBER 2008 2010 201120132014FIVEYEAR EXTENSIONMarch19,2008CVPUMP SUCTION 2-CV-TV-250C M,TNTNTC NT (cont.)2-HC-TV-204BCNT NT C NT NORMAL FREQUENCYEVERY3RD OUTAGE 2-CV-TV-250D M,T NT NT C NT Testing Required Codes:CVPUMP SUCTION 93 2-HC-TV-206AF1F2NTNTCC-TYPEC SCHEDULE 2-CV-TV-250A M,TNTNTCNT(C)-EVERYOUTAGE 2-HC-TV-206B CNTNT C NTM-MAINTENANCE 2-CV-TV-250BM,TNTNTCNTF-FAILURE CONTAINMENT 94 2-CV-TV-200F1F2(C)(C)(C)HOGGERD-DESIGN CHANGE 2-CV-4F1F2(C)(C)(C)OR-REQUESTEDBYOPS RHR LIQUID 97A 2-SS-TV-203ACNTNT C NTNT-NOTTESTED 2-SS-TV-203B F2NTNTCNTF(n)-Testfollowingpreviousfailure LEAKAGE 97B 2-LM-TV-200BNTNTCNTNT MONITORING 2-LM-TV-200A NTNTCNTNT PZR DEAD WT 97C 2-RC-143 NTNTCNTNT 2-RC-145NTNT CNTNT HYDROGEN RECOMBINATION 98A 2-HC-TV-200ACNTNTCNT SYSTEM 2-HC-TV-200BCNTNT C NT HYDROGEN RECOMBINATION 98B 2-HC-TV-208ANTNTCNTNT SYSTEM 2-HC-TV-208BNTNTCNTNT WET LAYUPBSG100 2-WT-438CNTNTCNT 2-WT-447CNTNT C NT REFUEL 103 2-RP-7 NT C NT NT C PURIFICATION 1-RP-84 NTCNTNT C REFUEL 104 2-RP-6CNTNTCNT PURIFICATION 1-RP-50CNTNT C NT LEAKAGE 105A 2-LM-TV-200DNTNT C NT NT MONITORING LEAKAGE 2-LM-TV-200CNTNTCNTNT MONITORING (cant)Page25of26 SerialNo.08-0092ADocketNo.50-339RequestforAdditionalInformationOne-TimeFive-YearExtensiontoTypeATestInterval Required TestingUNIT2 MECHANICAL PENETRATION VALVE Fall Spring Fall Spring Fall PENETRATION EVALUATION FUNCTION PENFORNORTHANNAILRT NO.NUMBER20082010 2011 2013 2014FIVEYEAR EXTENSIONMarch19,2008 HYDROGEN RECOMBINATION 105B 2-HC-TV-202A CNTNTC NT SYSTEM 2-HC-TV-202BCNTNTC NT OUTAGE LEAKAGE 105C 2-LM-TV-201D NT NT CNTNT MONITORING 2-LM-TV-201ANTNTCNTNT Testing Required Codes: LEAKAGE 105D 2-LM-TV-201BNTNTCNTNT MONITORINGC-TYPEC SCHEDULE 2-LM-TV-201CNTNT CNTNT(C)-EVERYOUTAGE SAFETY INJECTION 106 2-SI-TV-2842NTNTCNTNT TEST LINEM-MAINTENANCE 2-SI-TV-2859NTNT CNTNTF-FAILURE WETLAYUPCSG108 2-WT-439NTNTCNT NTD-DESIGNCHANGE 2-WT-448NTNT CNTNTOR-REQUESTEDBYOPS HYDROGEN RECOMBINATION 109 2-HC-20 CNTNT C NT SYSTEMF(n)-Testfollowingpreviousfailure 2-HC-TV-203ACNTNTCNT 2-HC-TV-203BCNTNTC NT 2-HC-TV-207 ACNTNTC NT 2-HC-TV-207B F2 NT NT C NT POST ACCIDENT 1110 2-DA-TV-203AF1F2NTNTC 2-DA-TV-203B CNTNT C NT INSTRUMENTAIR1122-1A-TV-201ANTNTCNTNT 2-1A-TV-201BNTNTCNTNT Page 26 of 26 SerialNo.OB-0092ADocketNo.50-339Requestfor Additional Information One-Time Five-YearExtensiontoTypeATestInterval ATTACHMENTNORTHANNAUNIT2'S INSERVICE INSPECTION

SUMMARY

REPORTFALL1999 REFUELING OUTAGE JANUARY3,2000 CONTAINMENT INSERVICE INSPECTION VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 January3,2000 United States NuclearRegulatoryCommission Attention:

DocumentControlDesk Washington,DC20555-0001 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWERSTATIONUNIT2 INSERVICE INSPECTION

SUMMARY

REPORTFORTHE FALL 1999 REFUELING OUTAGESerialNo.:

NLOS/MMDocketNo.:LicenseNo.:

99-618 50-339 NPF-7AssetforthintheprovisionsofASMESectionXI,ParagraphIWA-6230,enclosedis the Inservice InspectionSummaryReportforNorthAnnaPowerStationUnit2 for theFall1999refuelingoutage.Thisreportprovidesa summaryofthe examinationsperformedduringtheoutageforthethirdinservice inspectioninterval.Inaddition,the report summarizestheinspectionactivitiesassociatedwith10CFR 50.55a(b)(ix)(E)and10CFR 50.55a(b)(x)(A).

In accordancewithIWA-6220ofASMESectionXI, Attachment 1 includesaForm NIS-1,"Owner'sReportforInservice Inspections," an examinationsummary,and abstracts of examinations performed.

Attachment2includesFormsNIS-2,"Owner'sReportfor Repairs or Replacements." The entirereportwillbemaintainedonfileatthe corporateoffice.Ifyouhaveany questionsorrequireadditionalinformation,please contact us.Verytrulyyours,L.N.Hartz Vice President-NuclearEngineeringandServices Attachments 1 of 5 Attachment 1Page27of30SerialNo.:99-601DocketNo.:50-339 Abstract of Examinations Containment Inservice Inspection I.The requirements of10CFR 50.55a(b)(ix)(E)state forClassCC applications, that the licensee shall evaluate the acceptability of inaccessibleareaswhen conditions exist in accessible areas that could indicate the presenceoforresult in degradationtosuch inaccessibleareas.Foreach inaccessibleareaidentified, the licensee shall provide the followinginthe 151 SummaryReportrequiredby IWA-6000:1)A descriptionofthetypeand estimated extent of degradation,andthe conditions thatledtothe degradation; Discovery of a blisterintheliner protectivecoatingat aboutthe246foot elevation nearcolumn5and subsequent removal of the blisterrevealeda corroded spot underthepaint.Probingofthe approximatelyinch diameter corroded spotrevealedadeeppit believed to be through wall.Subsequent pressure testingconfirmedtheholetobe throughtheliner.UT thickness measurementsmadeinthe vicinity oftheholeona2inchX2inchgrid,revealed anomalous readings thatwerenot indicative of the suspected corrosion mechanism and promptedtheremovalofa5inchX7inchpiece oftheliner roughly centeredontheholeand another about3inch diameter piece oftheliner a short distancefromthehole.

Examination oftheremoved pieces revealed, contrary to expectation, that corrosionhadoccurredfromtheinsideofthelinertotheoutside.Therehad actually been extensive corrosion of the liner material in contactwiththeconcrete.

Examinationofthe exposed concrete surfacerevealedthe presence ofapieceofwood, subsequently determinedtobea4inchX4inchtimber, approximately6feetinlength,whichhadbeenin contactwiththe lineratthelocation ofthehole.The4X4 was embeddedinthe concrete and appearstohavebeen presentsincetheinitial concrete placement.2)An evaluation ofeacharea,andtheresultofthe evaluation; The locationandsize ofthe4X4was determined by combining visual examinations, UT thickness measurements of liner degradation and mechanical probes.Theconcrete structure was assessedasbeing affected slightly.but retainingtherequired minimum design.3)A description of necessary corrective actions;The4X4wasremovedandthe concretevoidwas grouted.II(a).The requirements of10CFR 50.55a(b)(x)(A) state forClassMC applications, that the licensee shall evaluate the acceptability of inaccessible areas when conditions exist in accessibleareasthatcould indicate the presence oforresult 2 of 5 Attachment 1 Page 28of30SerialNo.:

99-601DocketNo.:50-339 in degradationtosuch inaccessibleareas.Foreach inaccessibleareaidentified, the licenseeshallprovidethefollowinginthelSI SummaryReportrequiredby IWA-6000: 1)A descriptionofthetypeandestimatedextentof degradation, and conditions thatledtothedegradation; Discoveryofablisterinthelinerprotectivecoatingat aboutthe246foot elevationnearcolumn5and subsequent removal of the blisterrevealeda corroded spotunderthepaint.Probingofthe approximately Y4 inch diameter corrodedspotrevealedadeeppitbelievedtobethroughwall.

Subsequent pressuretestingconfirmedtheholetobethroughtheliner.UT thickness measurementsmadeinthevicinity oftheholeona2inchX2inchgrid,revealed anomalousreadingsthatwerenotindicativeofthe suspected corrosion mechanismandpromptedtheremovalofa5inchX7inchpiece oftheliner roughlycenteredontheholeand anotherabout3inch diameterpieceoftheliner a short distancefromthehole.Examinationoftheremovedpiecesrevealed.

contrary to expectation.

thatcorrosionhadoccurredfromtheinside ofthelinertotheoutside.Therehad actuallybeenextensivecorrosionofthelinermaterialin contactwiththeconcrete.

Examinationoftheexposed concrete surfacerevealedthepresenceofapieceofwood.

subsequently determinedtobea4inchX4inchtimber, approximately6feetinlength,whichhadbeenincontact with thelineratthelocationofthehole.The4X4was embeddedinthe concreteandappearstohavebeen presentsincetheinitial concrete placement.

Analysisoftheremovedsteelindicatesthatthecontactofthelinerplatewiththe wood timberinterferedwiththenormal tendency for concrete's alkalinitytoinhibitcorrosionofembeddedsteel.Theocclusion ofthesurfaceatthe point of contact betweensteeland timbercreatedapoint ofactivecorrosion, undoubtedly influencedbytheresidualmoistureinthewood.

There is evidencethatthe influenceofthewoodwasfeltbeyondthepoint of closest contact.Presumablythiswasbecauseofthelessthanoptimalconcretetosteel interfacethatwouldhaveoccurredduetothepresenceofthe obstruction to effective consolidation oftheconcreteintheareacausedbythewood.2)An evaluationofeacharea.andtheresultoftheevaluation; UT thicknessreadingsweremadeonanextendedareaon eithersideoftheholelocationusinga1inchX1inchinspectiongrid.The inspectionrevealedapatternoflowerthantheconstructedminimum(0.375inch) thicknessesinabandabout18inchhighbyabout8footlongextendingboth directionsfromthehole.Basedonananalyzedminimum acceptable wall thicknessintheareaof0.250inch,andtoaidremovalofthewoodfromthewall,sections of liner about10incheslongand3incheshighwereremovedalongtheband oflowreadings.Oneadditionalsection about4X4inchareawithameasuredwall thickness lessthan0.250inchwasalsoremoved.

3 of 5 Attachment 1Page29 of 30SerialNo.:99-601DocketNo.:50-3393)A description of necessary corrective actions;All of the linerplaterequiring replacement at elevation246feetandcolumn5wasreplaced priortorestart.

Some degraded plate, that is, liner exhibiting lessthanthe constructed minimum0.375inchwall thicknessbutstill thickerthanthe 0.250 inch minimum acceptable wall thickness,remainsinthearea.Toconfirm that the removalofthe4X4has eliminatedthecorrosion mechanism,itwas necessary to establish baseline thickness readingsonthe unremoved materialandto monitor thoseareasforthe next3lSIperiodsbyUT performing thickness measurements.II(b).The requirements of10CFR 50.55a(b)(x)(A)stateforClassMC applications, the licensee shall evaluate the acceptability of inaccessible areas when conditions exist in accessible areas that could indicate the presence of or result in degradationtosuch inaccessibleareas.Foreach inaccessible area identified, the licenseeshallprovidethe follOWinginthelSI Summary Report required by IWA-6000:1)A description ofthetypeand estimated extent of degradation I and conditions thatledtothe degradation;DuringtheCoderequiredGeneral Visual examinationitwasnoted that therewerea number ofareasatthe interface of the containment steel linerwiththe concrete floor wheretherewas evidence of some apparent rust.Therustwas apparentlytheresultof atmospheric humidity or possibly surface moisture being in contactwiththecarbonsteel overtheyearsof operation.2)An evaluation ofeacharea,andtheresultofthe evaluation; Initial assessmentindicatedtheadVisabilityofremovingsome concreteina sampleofthe questionableareastomore effectively evaluate the condition.

Four areasatthe liner to floor interfacevaryinginlengthfrom about 4 inches to about 24 inches were excavatedinthe concretewithachipping hammertoaninitialdepth of about1inchandawidth ofabout1inch.The excavated areaswerecleaned of debris and visually examined.Inallcasestherewas evidence of somerustbloomorstainonthesteel surface belowthelevel of the floorfora short distance.Therustwasnot thickorscalelike,nor particularly tightly adherent.Intwo of the excavationstherust appeared to continue deeper thantheinitial1inch excavation and additional excavation was performed.Inoneof these areastheremovalof about an additional1inch of concreteforalength of about 12 inches exposed uncorrodedlinersteel.Inthe about4inchlong excavationtheremoval of about another2inches of concrete morethanreachedthelimitofanycorrosion.

4 of 5 Attachment1 Page 30 of 30SerialNo.:

99-601DocketNo.:

So-339 Wall thickness measurementsweremadeinagrid patternalongthelength of the excavations.

Wall thicknessesofthe constructed minimum 0.375inchlinerplatevariedfrom about0.365inchto about0.400inch indicating the maximum wall loss that mayhaveoccurredis about0.035inch,which agreeswellwiththe observationoflittleornovisibleloss ofmetalfromtheliner.

There wasonelocationinan excavatedarealocated about 210 inches from column 6 towardscolumn7and about%inch below the floor level that exhibitedawall thicknessasthinas0.282inch.The spot was about1inchlongand

%inchwide.Sinceitwasvisibly evidentthattherewaslittleornolossofwallon the insideoftheliner, because the variation in thicknessinthe areawasnot consistentwithaplate lamination,andbasedonthe assessmentbyNDE personnel,itwasconcludedthatthearea probably representsalocalthinningon the outside surfaceofthe linerplatesuchasmight havebeencausedbyagouge during erection.Analysisofthe effectofthe thinned area indicates that the structuralandleaktight integrityofthelineris maintained.

The assessment of the four excavatedareasreveals that therehasbeenvery little generalloss'of liner wall thickness (about a maximum of 0.035inch)inthe approximately 18 years of operation ofNAPSUnit2atthe liner to floor interface.

Additionally,itis apparentthatthedepth of the corrosion processisminimal, extending a maximum ofabout3inchesbelowthelevelofthefloor.Basedontheareas examined,thereisnoconcernrelativetothe structural integrityorleak tightness of the liner.Consequently,itis concluded thatbasedonapossible average corrosionratelessthan0.002inchayear, continued operationofthe unit whiletherestoftheidentified linertofloor interface areas of concern remain unrepaired is acceptable becausethelinerwill continuetobefUlly capable of performingitsdesignfunction,i.e.

preventing leakage of containment atmospheretothe environment.3)A description of necessary corrective actions;Theareawiththe indicated0.282wall thicknessshouldbe monitored forthenext3lSI Periodstoverify thatnocorrosion betweenthesteel liner and containmentwallis occurring by performing UT thickness measurements.

Thereforerepairof the concrete floorintheareasshallbe postponeduntilsuchtimeasithasbeen demonstrated that the indicationisnotgrowing.

The protective coatingsonthe liner havebeenrepaired.Itis necessary to reinspectthearea throughthepaint to establish a baseline for future comparison.Finally,the excavationinthe concrete floorhasthe potentialtocollectwater, which might promote corrosion.

Normal outage walk downsshouldassuretheareastaysdry.

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