ML080710391

Millstone, Unit 3, Response to Request for Additional Information Regarding Stretch Power Uprate License Amendment Request Response to Question SCVB-07-0091

ML080710391
Person / Time
Site:	Millstone
Issue date:	03/10/2008
From:	Bischof G T Dominion Nuclear Connecticut
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
07-0846F
Download: ML080710391 (5)

Text

Dominion Nuclear Connecticut, Inc.\lii!SI'lIlC Power Station R(ITI"!"v Road\\"rclfore!, C:1'065R'iMarch10,2008 07-0846F RO 50-423 NPF-49SerialNo.:

NLOS/MAE:DocketNo.:LicenseNo.:U.S.NuclearRegulatoryCommissionAttention:DocumentControlDeskOneWhiteFlintNorth11555RockvillePikeRockville,MD20852-2378 DOMINION NUCLEAR CONNECTICUT.

INC.MILLSTONE POWERSTATIONUNIT3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING STRETCH POWERUPRATELICENSE AMENDMENT REQUEST RESPONSE TO QUESTIONSCVB-07-0091DominionNuclearConnecticut,Inc.(DNC)submittedastretchpowerupratelicense amendmentrequest(LAR)forMillstonePowerStationUnit3(MPS3)inlettersdatedJuly13,2007(SerialNos.07-0450and07-0450A),andsupplementedthesubmittalbylettersdatedSeptember12,2007(SerialNo.07-04508),December13,2007(SerialNo.07-0450C)andMarch5,2008(SerialNo.07-0450D).TheNRCstaffforwardedrequestsforadditionalinformation(RAls)inOctober29,2007,November26,2007,December14,2007andDecember20,2007letters.DNCrespondedtotheRAlsinlettersdatedNovember19,2007(SerialNo.07-0751),December17,2007(SerialNo.07-0799),January10,2008(SerialNos.07-0834,07-0834A,07-0834C,and07-0834F),January11,2008(SerialNos.07-08348,07-0834E,07-0834G,and07-0834H),January14,2008(SerialNo.07-0834D),January18,2008(SerialNos.07-0846, 07-0846A, 07-08468,07-0846C,and07-0846D),January31,2008(SerialNo.

08341)andFebruary 25,2008(SerialNos.07-0799A,and07-0834J).Ina letter dated January18,2008(SerialNo.

07-0846C), DNC provided a responsetoNRC question SCVB-07-0091.Subsequently,ina conferencecallwiththeNRC staff on February26,2008,DNC informedtheNRC staffofthe intent to supersede the response to question SCVB-07-0091.The superseded response additionally providestheinitial conditionsusedfor stretch power uprateinthe pressurizer compartment analysis.Therevised responsetoRAI Question SCVB-07-0091is providedinthe attachmenttothis letter and supersedes the previous responseinits entirety.TheinformationprovidedbythisletterdoesnotaffecttheconclusionsofthesignificanthazardsconsiderationdiscussionintheDecember13,2007DNCletter(SerialNo.

0450C).

SerialNo.07

-0846F Docket No.50-423RAIQues.SCVB-07-0091, SPU Page2of3 Shouldyouhaveany questionsinregardtothis submittal, please contact Ms.MargaretEarleat 804-273-2768.

Sincerely, Vice President-Nuclear Engineering COMMONWEALTHOFVIRGINIACOUNTYOFHENRICOTheforegoingdocumentwasacknowledgedbeforeme,inandfortheCountyand Commonwealthaforesaid,todaybyGerald T.Bischof,whoisVicePresident-NuclearEngineeringofDominionNuclearConnecticut,Inc.HehasaffirmedbeforemethatheisdulyauthorizedtoexecuteandfiletheforegoingdocumentinbehalfofthatCompany,andthatthestatementsinthedocumentaretruetothebestofhisknowledgeandbelief.Acknowledgedbeforemethis It) of AllrcA , 2008.My Commission EXPires:ffiuzdJ(;.//J.s-.s:NotaryPublic Attachment Commitments madeinthisletter:Nonecc:U.S.Nuclear Regulatory Commission Region I Regional Administrator 475 Allendale RoadKingof Prussia, PA 19406-1415Mr.J.G.Lamb U.S.Nuclear Regulatory Commission One WhiteFlintNorth 11555 Rockville PikeMailStop 0-8B1A Rockville, MD 20852-2738VICKIL.HULL 4 Notary PubUccommonweGlth of V1fglnla 1....1 IMY CommtAIOn Ix""" May al.1010*--

Mr.J.D.Hughey Project Manager U.S.Nuclear Regulatory Commission One WhiteFlintNorth 11555 Rockville PikeMailStop 0-8B3Rockville,MD 20852-2738 NRC Senior Resident Inspector MillstonePowerStation DirectorBureauofAir Management MonitoringandRadiationDivision Department of Environmental Protection79Elm StreetHartford,CT 06106-5127SerialNo.07-0846F DocketNo.50-423RAIQues.SCVB-07-0091, SPUPage3of3 SerialNo.07

-0846F Docket No.50-423 ATTACHMENT LICENSE AMENDMENT REQUEST STRETCH POWER UPRATE LICENSE AMENDMENT REQUEST RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RESPONSE TO QUESTION SCVB-07-0091 MILLSTONE POWER STATION UNIT 3 DOMINION NUCLEAR CONNECTICUT, INC.

SerialNo.07-0846FDocketNo.50-423Attachment,Page1of1 Containment and Ventilation Branch NRC Question SCVB-07-0091 Millstone Power Station Unit3(MPS3)FSAR lists the following initial containment conditions selected for the subcompartment analyses: Pressurizer Subcompartment:

Temperature 100 0 F;Air partial pressure 8.9 pounds per square inch absolute (psia);relative humidity 10 percent.Steam Generator and Upper Reactor Cavity Subcompartments:

Temperature 120 0 F;air partial pressure 9.0 psia;relative humidity 50 percent.Section 2.6.2 of Attachment 5 of the licensing amendment request (LAR)does not list the initial conditions used for subcompartment analysis.Please provide the initial conditions used for SPU subcompartment analysis.In case any of these conditions deviate from the current licensing bases, provide appropriate justification for the deviation.

DNC Response Since the Stretch Power Uprate(SPU)Massand Energy releases for the steam generator and reactor cavity subcompartments are boundedbytheMassand Energy releases assumedinthe current analyses,nonew subcompartment analyses were performedforthe steam generator and reactor cavity subcompartments.

The assumptiononinitial conditions (stated in MPS3 FSAR Section 6.2.1.2.1) remains unchanged.Forthepressurizercompartment,theSPUMassandEnergyreleasesarenotboundedbythecurrentanalyses.Thus,thepressurizer compartment analyseswerere-performed.Sensitivitystudieswereperformedtodeterminethelimitingconditions.Fourcaseswereanalyzed:*80°Fand9.0psia(totalpressure)*100°Fand9.0psia(totalpressure)*100°Fand10.4psia(totalpressure)*100°Fand14.2psia(totalpressure)Allcasesassumedrelativehumidityof10percent.Thesensitivitystudiesboundthecurrentassumedconditions.BasedonthesensitivitystudiesandtheTechnicalSpecificationlowerlimiton containmentpressure,theinitialconditionsassumedforthelimitingcaseare100 OFand10.4psia(totalpressure).