ML080560392

Response to Request for Additional Information Regarding Stretch Power Uprate License Amendment Request, Supplemental Response to Question EMCB-07-0072

ML080560392
Person / Time
Site:	Millstone
Issue date:	02/25/2008
From:	Gerald Bichof Dominion, Dominion Nuclear Connecticut
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
07-0834J
Download: ML080560392 (7)

Text

Domin.on Nuclear Connecticut, Inc.\1 il!-;(, I'L'Power Station'Z\ll'l'!rr)'Road IIlTl.I'd, CT ()(,.3Wi February 25.2008U.S.NuclearRegulatoryCommissionAttention:DocumentControlDeskOneWhiteFlintNorth11555RockvillePikeRockville,MD20852-2378.._, Dominion'SerialNo.:07-0834J NLOS/MAE: R1DocketNo.:50-423LicenseNo.:NPF-49 DOMINION NUCLEAR CONNECTICUT, INC.MILLSTONE POWERSTATIONUNIT3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING STRETCH POWERUPRATELICENSE AMENDMENT REQUEST SUPPLEMENTAL RESPONSETOQUESTION EMCB-07-0072DominionNuclearConnecticut,Inc.(DNC)submittedastretchpowerupratelicenseamendmentrequest(LAR)forMillstonePowerStationUnit3(MPS3)inlettersdatedJuly13,2007(SerialNos.07-0450and07-0450A),andsupplementedthesubmittalbylettersdatedSeptember12,2007(SerialNo.07-0450B)andDecember13,2007(SerialNo.07-0450C).TheNRC staffforwardedrequestsforadditionalinformation(RAls)inOctober29,2007, November26,2007,December14,2007andDecember20,2007letters.DNCrespondedtotheRAlsinlettersdatedNovember19,2007(SerialNo.07-0751), December 17,2007(SerialNo.07-0799),January10,2008(SerialNos.07-0834,07-0834A,07-0834C,and07-0834F),January11,2008(SerialNos.07-0834B, 07-0834E,07-0834G,and07-0834H),January14,2008(SerialNo.

07-08340),January18,2008(SerialNos.07-0846,07-0846A,07-0846B,07-0846C, 07-08460),andJanuary 31,2008(SerialNo.

07-08341).TheresponsetoquestionEMCB-07-0072inDNCletterdatedJanuary14,2008,containedacommitmenttoprovideasummaryoffinalresultsof elastic-plasticanalysisasrequestedintheNRCstaff'squestion.ThesupplementalresponsetoquestionEMCB-07-0072containedintheattachmenttothisletterprovidestherequestedinformation.Theinformationprovidedbythisletterdoesnotaffecttheconclusionsofthe significanthazardsconsiderationdiscussionintheDecember13,2007DNCletter(SerialNo.07-0450C).

SerialNo.07-0834JDocketNo.50-423SPUSupp.RespQues.EMCB-07-0072Page2of3Shouldyouhaveanyquestionsinregardtothissubmittal,pleasecontactMs.MargaretEarleat804-273-2768.

Sincerely, tt;;VicePresident-NuclearEngineering COMMONWEALTHOFVIRGINIACOUNTYOFHENRICOTheforegoingdocumentwasacknowledgedbeforeme,inandfortheCountyandCommonwealthaforesaid,todaybyGeraldT.Bischof,whoisVicePresident-NuclearEngineeringofDominionNuclearConnecticut,Inc.HehasaffirmedbeforemethatheisdulyauthorizedtoexecuteandfiletheforegoingdocumentinbehalfofthatCompany,andthatthestatementsinthe document aretruetothebestofhisknowledgeandbelief.Acknowledgedbeforemethis g5J of liJ.l'S&tt4'u'V, 2008.7 (J My Commission Expires:,'3/,.;)010.r.., Ie 1.2<X.1/LLlK.NotaryPublic Commitmentsmadeinthisletter:None Attachmentcc:U.S.NuclearRegulatoryCommissionRegionI Regional Administrator475AllendaleRoadKingofPrussia,PA19406-1415 Mr.J.G.LambU.S.NuclearRegulatoryCommissionOneWhiteFlintNorth11555RockvillePikeMailStop 0-8B1ARockville,MD20852-2738 VICKI L.HULL Notary PublIc CommotlWeQlth of YIfgInIa 1..a My CommIIIIon

.....May 1" 201' SerialNo.07-0834J DocketNo.50-423SPUSupp.RespQues.

EMCB-07-0072Page3of3Ms.C.J.Sanders Project Manager U.S.Nuclear Regulatory Commission One WhiteFlintNorth11555RockvillePikeMailStop 0-8B3Rockville,MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station DirectorBureauofAir Management MonitoringandRadiationDivision Department of Environmental Protection79Elm StreetHartford,CT 06106-5127 SerialNo.07

-0834J Docket No.50-423 ATTACHMENT LICENSE AMENDMENT REQUEST STRETCH POWER UPRATE LICENSE AMENDMENT REQUEST RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION SUPPLEMENTAL RESPONSE TO QUESTION EMCB-07-0072 MILLSTONEPOWERSTATIONUNIT3 DOMINION NUCLEAR CONNECTICUT, INC.

SerialNo.07-0834JDocketNo.50-423Attachment,Page1of3 Mechanical and Civil Engineering Branch EMCB-07-0072InadditiontoTable2.2.3-3,variouscomponentslistedinTables2.2.2.3-1,2.2.2.5.2.2-1and2.2.2.7.2-2ofLARAttachment5,whichcontainstresssummaries,havefailedtomeettheNB-3222.2primaryplussecondarystressintensityrequirementof3Sm.Attachment5statesthatthesecomponentshavebeenqualifiedbypassingthesimplifiedelastic-plasticanalysisofNB3228.5.a)Provideasummaryoftheevaluationswhichshowsthatthespecialrulesforexceeding3Smasprovidedby(a)through (f)ofsubparagraph3228.5havebeenmet.b)Tables2.2.2.5.2.2-1and2.2.2.7.2-2alsoprovideacceptabilityofcomponents,thatfailedtomeetthe3Smallowable,throughNB-3228.3.DiscussthebasisandshowthatyoumeettherequirementsforusingtheNB-3228.3criteria.Alsoprovideasummaryoftheanalysisresults,whichshowsthattherequirementsofNB-3228.3havebeenmet.

ONCInitialResponse(January14, 2008)Severalsteamgeneratorandpressurizerlocationshavemaximumstressrangesthatexceedthe3SmlimitinNB-3222.2.Mostofthesesectionsmeetthe simplified elastic-plasticanalysiscriteriainNB-3228.3oftheASMEB&PVCode,Section111,1971Editionthroughthesummer1973Addendum(equivalenttoNB-3228.5inlatterCodeEditions).InNB-3228.3therearesixrequirements,(a) through (f),whicharesatisfied.Asummaryshowingthateachoftheserequirementshavebeensatisfiedwillbeprovided.Inaddition,thosesectionsthatexceed3Smandthatwerequalifiedbyfull elastic-plasticanalysiswillalsobesummarizedintheresponseshowingdetailsoftheplasticityanalysis.Documentationofthefinalresultsoftheelastic-plasticanalysisisunderdevelopment.AsummaryoftheresultswillbeprovidedbyFebruary28,2008.

ONC Supplemental Response(a&b)Thefollowingsixcriteriawereconsideredinevaluatingthecomponentslistedasnotmeetingthe3S mstresslimit.Eachofthecriteriaislistedfollowedbyabriefdiscussionaboutwhythecriterionwasmetforthosecomponentsinquestion.FatigueanalysisforalloftheaffectedcomponentsproceededaccordingtotheCodewiththeexceptionthattheaffectedstressrangesweremultipliedbytheK efactorcalculatedperNB-3228(b).

SerialNo.07-0834JDocketNo.50-423Attachment,Page2of3Whilethealternatingstressfailedtomeet38 minitially,itwasshowntomeetthe38 mlimitoncethethermalbendingstresswasremovedandisthereforeacceptable.Inallcases,therequirements(a)through (f),whichrequireasimplifiedplasticanalysis,weremetasdiscussedbelow.

NB-3228.3 (a)Therange of primary-plus-secondary membrane plus bendingstressintensity, excluding thermal bending stresses, shall be3S m.Forthecomponentsthatwereevaluatedusingthesimplifiedplasticmethodology,the primary-plus-secondarymembraneplusbendingstressintensityexcludingthermalbendingcomparedtotheallowablelimit(38 m)areshowntobelessthan1.0.Thisrequirementisthereforemetforthecomponentslistedasnotinitiallymeetingthe 38 mlimitwiththermalbendingconsidered.

NB-3228.3(b)Thevalue of Sausedfor enteringthedesignfatiguecurveis multiplied by the factor K e ,...The K,factorasdefinedforthisrequirementiscalculatedforallstressrangesthatexceedthe3S m limit.SaismultipliedbytheK efactorandthisproductisusedtoenterthedesignfatiguecurve.Thisisdoneforallcomponentswhereasimplifiedelastic-plasticanalysisisperformed.

NB-3228.3(c)Therest ofthefatigue evaluationstaysthesame as required in NB-3222.4, exceptthatthe procedure of NB-3227.6 need notbeused.ThefatigueanalysisforallcomponentsisperformedpertheCode.Where3S misexceeded,thealternatingstress(8 a)usedtoenterthefatiguecurveismultipliedby K,andthefatigueusageforthatcombinationiscalculated.Otherwisetherewasnochangetothemethodologyusedtocalculatethefatigueusagefactorforthe components.

NB-3228.3(d)The componentmeetsthethermal ratcheting requirement of NB-3222.5.Thecomponentslistedasapplyingthesimplified elastic-plasticanalysismethodologymeetthisconditioneitherbecausethe componentisnotsubjecttointernalsteadystatepressureloading(blowdownpipe)orbecausethestresshasbeenshowntomeettheCoderequirementsforthermalstressratchet.

NB-3228.3(e)Thetemperaturedoes not exceed those listedintheabove SerialNo.07-0834JDocketNo.50-423Attachment,Page3of3 table for the various classes ofCodematerials.Sincethemaximumtemperaturesspecifiedinthetableof"m"and"n"parametersforvariousclassesofCodematerials,Item(b)above,is700and800degreesF,andnoneofthesteamgeneratorcomponentsexceed700degreesF,thisrequirementismetforallsteam generator components.

NB-3228.3(f)The material shall have a minimum specified yield strength tominimumspecified ultimate strength ratio oflessthan0.80.SteamgeneratormaterialsusedwithintheMillstonesteam generatorshaveaminimumspecifiedyieldstrengthtominimumspecifiedultimatestrengthratiolessthan0.70fortherangeofmaterialsandtemperatures.Thisislessthanthemaximumof0.80requiredbytheCode.Therefore,thisrequirementismetforallofthecomponents considered.