ML14226B001

Grand Gulf Nuclear Station, Unit 1, Response to Request for Additional Information Regarding Maximum Extended Load Line Limit Plus Amendment Request Dated 7/2/2014

ML14226B001
Person / Time
Site:	Grand Gulf
Issue date:	08/14/2014
From:	Mulligan K J Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML14227A204	List: GNRO-2014/00051, Response to Request for Additional Information Regarding Maximum Extended Load Line Limit Plus Amendment Request Dated 7/2/2014
References
GNRO-2014/00051, TAC MF2798
Download: ML14226B001 (15)

Text

Q Enclosure 1containsPROPRIETARY information GNRO-2014/00051 August14,2014U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, DC20555-0001 EntergyOperations, Inc.P.O.Box756PortGibson,MS39150KevinMulliganSiteVicePresident GrandGulfNuclearStationTel.(601)437-7400

SUBJECT:

ResponsetoRequestforAdditional Information Regarding MaximumExtendedLoadLineLimitPlusAmendment Request,dated7/2/2014.

GrandGulfNuclearStation,Unit1DocketNo.50-416LicenseNo.NPF-29

REFERENCES:

1Electronic RequestforAdditional Information Regarding "MaximumExtendedLoadLineLimitPlus"Amendment RequestDated7/2/2014(TACMF2798)2EntergyLetter,"MaximumExtendedLoadLineLimitAnalysisPlus(MELLLA+)

LicenseAmendment Request,"

GNRO-2013/00012, datedSeptember 25,2013(ADAMSAccession No.ML13269A140).

DearSirorMadam:

EntergyOperations, Inc.isproviding intheEnclosures aresponsetotheReference 1RequestforAdditional Information (RAI).Enclosure 1containsproprietary information asdefinedby10CFR2.390.General Hitachi(GEH),astheowneroftheproprietary information, hasexecutedtheenclosedaffidavit, whichidentifies thattheenclosedproprietary information hasbeenhandledandclassified asproprietary, iscustomarily heldinconfidence, andhasbeenwithheldfrompublicdisclosure.

Theproprietary information wasprovidedtoEntergyinaGEHtransmittal thatisreferenced bytheaffidavit.

Theproprietary information hasbeenfaithfully reproduced intheenclosedsuchthattheaffidavit remainsapplicable.

GEHherebyrequeststhattheenclosedproprietary information bewithheldfrompublicdisclosure inaccordance withtheprovisions of10CFR2.390and9.17.Information thatisnotconsidered proprietary isprovidedinEnclosure 2.Enclosure 3containsanaffidavit whichidentifies thattheinformation contained inEnclosure 1hasbeenhandledandclassified asproprietary toGEH.OnbehalfofGEH,EntergyrequeststhatEnclosure 1bewithheldfrompublicdisclosure inaccordance with10CFR2.390(b)(1).

WhenEnclosure 1isremovedfromthisletter,theentiredocumentisNON-PROPRIETARY GNRO-2014-00051 Page2of2Thislettercontainsnonewcommitments.

Ifyouhaveanyquestions orrequireadditional information, pleasecontactMr.JamesNadeauat601-437-2103.

Ideclareunderpenaltyofperjurythattheforegoing istrueandcorrect;executedonAugust14,2014.Sincerely,

Enclosures:

1GEH-GGNS-AEP-641 Proprietary Responses totheRequestforAdditional Information 2GEH-GGNS-AEP-641 Non-Proprietary Responses totheRequestforAdditional Information 3GEHAffidavit forEnclosure 14GGNSResponsetoRAI-1and5cc:withEnclosures U.S.NuclearRegulatory Commission AnN:Mr.MarcL.DapasRegionalAdministrator, RegionIV1600EastLamarBoulevard Arlington, TX76011-4511 U.S.NuclearRegulatory Commission AnN:Mr.A.Wang,NRR/DORLMailStopOWFN/8G14Washington, DC20555-0001 NRCSeniorResidentInspector GrandGulfNuclearStationPortGibson,MS39150StateHealthOfficerMississippi Department ofHealthP.O.Box1700Jackson,MS39215-1700 Enclosure 2toGNRO-2014/00051 GEH-GGNS-AEP-641 Non-Proprietary Responses totheRequestforAdditional Information ENCLOSURE 2GEH-GGNS-AEP-641 Responses toSCVBRAls2,3,4,and6inSupportofGGNSMELLLA+LAR Non-Proprietary Information

-ClassI(Public)INFORMATION NOTICEThisisanon-proprietary versionofEnclosure 1ofGEH-GGNS-AEP-641 whichhastheproprietary information removed.Portionsofthedocumentthathavebeenremovedareindicated byanopenandclosedbracketasshownhere[[]].

Enclosure 2Non-Proprietary Information

-ClassI(Public)GEH-GGNS-AEP-641 RAI-2Page1of4Theproposedrevisedwetwellairspacevolume(asapartoftheoverallwetwellvolume)isaninputparameter tothefollowing analyses:

(a)Longtermcontainment pressureandtemperature

response, (b)Longtermsuppression pooltemperature responsefornetpositivesuctionhead(NPSH),and(c)NPSHanalysisforresidualheatremoval(RHR)andcorespray(CS)pumpswhichisimpactedby(b).Pleasedescribetheimpactoftheincreaseinthewetwellairspacevolumeontheseanalyses, andprovideresults.GEHResponseInthemaximumextendedloadlinelimitanalysisplus(MELLLA+)

analyses, onlythevolumebelow'the hydraulic controlunit(HCU)floorwasincreased; thecorresponding changewasnotmadeinthecontainment volume.Thisadditional volumebelowtheHCUfloorislessthan10/0ofthecontainment volume,andanyeffectofthelongtermanalysesissmall.Thelongtermanalysesmodelthecontainment (volumeoutsidethedrywell)[[]]Itcanbededucedfromthefirstlawofthermodynamics thatahigherpressureandhighertemperature willresultifthecontainment volumeisdecreased forthesamemassandenergyaddedtotheairspacefromabreak.Therefore, ignoringtheadditional freevolumeintheexistinglongtermcontainment pressureandtemperaturecalculations isconservative withrespecttothepressureandairspacetemperature calculations.

Althoughtheeffectmaybeverysmall,overpredicting thecontainment pressurealsoresultsinamoreconservative suppression pooltemperature duetolessevaporation thanactual.Theconservatism inthelongtermcontainment pressuredoesnothaveanadverseeffectontheavailable netpositivesuctionhead(NPSH)becausetheGrandGulfNuclearStation(GGNS)NPSHanalysesdonottakecreditforcontainment overpressure.

Enclosure 2Non-Proprietary Information

-ClassI(Public)GEH-GGNS-AEP-641 RAI-3Page2of4Assumingtheoverallcontainment volumeisthesameasinthecurrentanalysis; theproposedincreaseinthewetwellairspacevolumeby13,192ft3shouldresultinoneorbothofthefollowing:

(a)Decreaseinthesuppression poolvolumeby13,192fforless,whichwouldimpactitsheightsatlowandhighlevelandventsubmergence.

(b)Decreaseinthecontainment volumeabovehydraulic controlunit(HCU)floorlevelby13,192ft3orless.Pleasedescribetheimpactofthechangesinaboveparameters onthecontainment analyseswhichusethemasinputs,andprovideresults.Incasetheoverallcontainment volumehasincreased, pleaseprovidereasonsanditsimpactontheanalyseswhichusesitasinputandprovideresults.GEHResponse(a)TheincreaseinthefreewetwellvolumeisduetousingamoreaccurateHCUfloorthickness andaffectsonlytheairspacevolumebelowtheHCUfloor.Thereisnochangeinthesuppression poolvolumeorlevel.(b)Thecontainment volumedidnotchangeintheMELLLA+analyses; onlytheairspacevolumebelowtheHCUfloorincreased.

ThepresenceoftheHCUfloorisaccounted forinaconservative mannerintheshorttermanalyses.

[[]]Giventhisfeatureofthemethod,thereduction inthevolumeabovetheHCUfloordoesnotenterintothecalculations.

Becausethecontainment volumeremainsthesame,theshorttermresultsarenotaffectedbythereduction inthevolumeabovetheHCUfloor.

Enclosure 2Non-Proprietary Information

-ClassI(Public)GEH-GGNS-AEP-641 RAI-4Page3of4Itappearsthatthecurrentshorttermcontainment pressureandtemperature responseareimpactedby(i)revisedM&EreleaseunderMELLLA+operation, and(ii)theincreaseinthewetwellairspacevolumewhichisnotrelatedwithMELLLA+operation.

(a)Whataretheparameters otherthan(i)and(if)thathaveimpactedtheshorttermcontainment pressureandtemperature response?

(b)Providecontainment pressureandtemperature responseresults(peakvaluesandprofiles) assumingrevisedM&EreleaseunderMELLLA+operation andwithallotherassumptions andinputparameters including wetwellairspacevolumesameasinAOR.GEHResponse(a)Thefollowing parameters aredifferent intheMELLLA+analysisascomparedtotheextendedpoweruprate(EPU)analysisinadditiontothechangeinvolumebelowtheHCUfloor:themainsteamlineflowlimiterareaandtheHCUfloorarea.(b)Themostlimitingpower/flow pointduringMELLLA+operation isthesameasduringCLTPoperation.

Therefore, thedifferences showninTable4-3betweentheCLTPandMELLLA+resultsareduesolelytotherefinements intheinputs,notduetoMELLLA+operation.

TheresultsforMELLLA+operation wouldbethesameasthoseintheanalysisofrecord(AOR),withallotherassumptions andinputparameters, including wetwellairspacevolume,thesameasintheAOR.

Enclosure 2Non-Proprietary Information

-Class[(Public)GEH-GGNS-AEP-641 RAI-6Page4of4RefertoReference 2,Section4.1.2,sincetheincreaseinthewetwellairspacevolumeisnotMELLLA+related,pleaseprovidethefollowing information (a)Section4.1.2.1;doestheLoeAloadsremainboundingunderMELLLA+operation withoutthechangeinthewetwellairspacevolume?(b)Section4.1.2.4;doestheSRVcontainment dynamicloadsremainboundingunderMELLLA+operation withoutthechangeinthewetwellairspacevolume?GEHResponse(a)ThelimitingMELLLA+

power/flow pointisthesameasthelimitingEPUpower/flow point.Therefore, theloadsevaluationsperformed forthemostlimitingpointinthecurrentlicensing basiswithoutachangeinthecontainment volumeareapplicable totheMELLLA+operation andremainbounding.

(b)TheSRVloadsarenotaffectedbyMELLLA+operation asstatedinSection4.1.2.4.Therefore, theSRVcontainment dynamicloadsremainboundingunderMELLLA+conditions withoutthechangeinthewetwellairspacevolume.

Enclosure 3toGNRO-2014/00051 GEHAffidavit forEnclosure 1

GE-Hitachi NuclearEnergyAmericasLLCAFFIDAVIT I,JamesF.Harrison, stateasfollows:(1)IamtheVicePresident, Regulatory Affairs,FuelLicensing, GE-Hitachi NuclearEnergyAmericasLLC("GEH"),andhavebeendelegated thefunctionofreviewing theinformation described inparagraph (2)whichissoughttobewithheld, andhavebeenauthorized toapplyforitswithholding.

(2)Theinformation soughttobewithheldiscontained inEnclosure 1ofGEHletter,GEH-GGNS-AEP-641, "GEHResponses toMELLLA+SCVBRequestsforAdditional Information 2,3,4,and6,"datedJuly22,2014.TheGEHproprietary information inEnclosure 1,whichisentitled"Responses toSCVBRAIs2,3,4,and6inSupportofGGNSMELLLA+LAR,"isidentified byadottedunderline insidedoublesquarebrackets.

..

Figuresandlargeobjectsareidentified withdoublesquarebracketsbeforeandaftertheobject.Ineachcase,thesuperscript notationn:referstoParagraph (3)ofthisaffidavit, whichprovidesthebasisfortheproprietary determination.

(3)Inmakingthisapplication forwithholding ofproprietary information ofwhichitistheownerorlicensee, GEHreliesupontheexemption fromdisclosure setforthintheFreedomofInformation Act("FOIA"),

5U.S.C.Sec.552(b)(4),

andtheTradeSecretsAct,18U.S.C.Sec.1905,andNRCregulations 10CFR9.l7(a)(4),

and2.390(a)(4) fortradesecrets(Exemption 4).Thematerialforwhichexemption fromdisclosure isheresoughtalsoqualifies underthenarrowerdefinition oftradesecret,withinthemeaningsassignedtothosetermsforpurposesofFOIAExemption 4in,respectively, CriticalMassEnergyProjectv.NuclearRegulatory Commission, 975F.2d871(D.C.Cir.1992),andPublicCitizenHealthResearchGroup v.FDA,704F.2d1280(D.C.Cir.1983).(4)Theinformation soughttobewithheldisconsidered tobeproprietary forthereasonssetforthinparagraphs (4)a.and(4)b.Someexamplesofcategories ofinformation thatfitintothedefinition ofproprietary information are:a.Information thatdiscloses aprocess,method,orapparatus, including supporting dataandanalyses, where.prevention ofitsusebyGEH'scompetitors withoutlicensefromGEHconstitutes acompetitive economicadvantage overothercompanies; b.Information that,ifusedbyacompetitor, wouldreducetheirexpenditure ofresources orimprovetheircompetitive positioninthedesign,manufacture,

shipment, installation, assurance ofquality,orlicensing ofasimilarproduct;c.Information thatrevealsaspectsofpast,present,orfutureGEHcustomer-funded development plansandprograms, resulting inpotential productstoGEH;d.Information thatdiscloses tradesecretorpotentially patentable subjectmatterforwhichitmaybedesirable toobtainpatentprotection.

Affidavit forGEH-GGNS-AEP-641 Page10f3 GE-Hitachi NuclearEnergyAmericasLLC(5)Toaddress10CFR2.390(b)(4),

theinformation soughttobewithheldisbeingsubmitted toNRCinconfidence.

Theinformation isofasortcustomarily heldinconfidence byGEH,andisinfactsoheld.Theinformation soughttobewithheldhas,tothebestofmyknowledge andbelief,consistently beenheldinconfidence byGEH,notbeendisclosedpublicly,and notbeenmadeavailable inpublicsources.Alldisclosures tothirdparties,including anyrequiredtransmittals totheNRC,havebeenmade,ormustbemade,pursuanttoregulatory provisions orproprietary orconfidentiality agreements thatprovideformaintaining theinformation inconfidence.

Theinitialdesignation ofthisinformation asproprietary information, andthesubsequent stepstakentopreventitsunauthorized disclosure, areassetforthinthefollowing paragraphs (6)and(7).(6)Initialapprovalofproprietary treatment*

ofadocumentismadebythemanageroftheoriginating component, whoisthepersonmostlikelytobeacquainted withthevalueandsensitivity oftheinformation inrelationtoindustryknowledge, orwhoisthepersonmostlikelytobesubjecttothetermsunderwhichitwaslicensedtoGEH.(7)Theprocedure forapprovalofexternalreleaseofsuchadocumenttypically requiresreviewbythestaffmanager,projectmanager,principal scientist, orotherequivalent authority fortechnical content,competitive effect,anddetermination oftheaccuracyoftheproprietary designation.

Disclosures outsideGEHarelimitedtoregulatory bodies,customers, andpotential customers, andtheiragents,suppliers, andlicensees, andotherswithalegitimate needfortheinformation, andthenonlyinaccordance withappropriate regulatory provisions orproprietary orconfidentiality agreements.

(8)Theinformation identified inparagraph (2),above,isclassified asproprietary becauseitcontainsthedetailsofGEHmethodology.

Thesemethods,techniques, anddataalongwiththeirapplication tothedesign,modification, andanalyseswereachievedatasignificant costtoGEH.Thedevelopment oftheevaluation processes alongwiththeinterpretation andapplication oftheanalytical resultsisderivedfromtheextensiveexperiencedatabases thatconstitute amajorGEHasset.(9)Publicdisclosure oftheinformation soughttobewithheldislikelytocausesubstantial harmtoGEH'scompetitive positionandforeclose orreducetheavailability ofmakingopportunities.

Theinformation ispartofGEH'scomprehensive BWRsafetyandtechnology base,anditscommercial valueextendsbeyondtheoriginaldevelopment cost.Thevalueofthetechnology basegoesbeyondtheextensive physicaldatabaseandanalytical methodology andincludesdevelopment oftheexpertise todetermine andapplytheappropriate evaluation process.Inaddition, thetechnology baseincludesthevaluederivedfromproviding analysesdonewithNRC-approved methods.Theresearch, development, engineering, analytical andNRCreviewcostscompriseasubstantial investment oftimeandmoneybyGEH.Theprecisevalueoftheexpertise todeviseanevaluation processandapplythecorrectanalytical methodology isdifficult toquantify, butitclearlyissubstantial.

GEH'scompetitive advantage willbelostifitsAffidavit forGEH-GGNS-AEP-641 Page2of3 GE-Hitachi NuclearEnergyAmericasLLCcompetitors areabletousetheresultsoftheGEHexperience tonormalize orverifytheirownprocessoriftheyareabletoclaimanequivalent understanding bydemonstrating thattheycanarriveatthesameorsimilarconclusions.

Thevalueofthisinformation toGEHwouldbelostiftheinformation weredisclosed tothepublic.Makingsuchinformation available tocompetitors withouttheirhavingbeenrequiredtoundertake asimilarexpenditure ofresources wouldunfairlyprovidecompetitors withawindfall, anddepriveGEHoftheopportunity toexerciseitscompetitive advantage toseekanadequatereturnonitslargeinvestment indeveloping andobtaining theseveryvaluableanalytical tools.Ideclareunderpenaltyofperjurythattheforegoing istrueandcorrect.Executedonthis22nddayofJuly2014......JamesF.HarrisonVicePresident, FuelLicensingRegulatoryAffairs GE-Hitachi NuclearEnergyAmericasLLC3901CastleHayneRoadWilmington, NC28401james.harrison@ge.com Affidavit forGEH-GGNS-AEP-641 Page3of3 Enclosure 4toGNRO-2014/00051 GGNSResponsetoRAI-1and5 Enclosure 4GGNSResponsetoRAI-1and5Page1of2RAI-lReference 2,Table4-1indicates thewetwellairspacevolumeintheproposedanalysisisincreased by13,192fe(149,978feminus136,786fe)fromthecurrentanalysis.

Pleaseprovidethefollowing information:

(a)Isthechangeinwetwellairspacevolumecorrection ofanerror?(b)Incasethechangeisnotcorrection ofanerror,pleasedescribethechangesinthecontainment configuration thatprovidesadditional airspacevolumeinthewetwell.GGNSResponsea.Thechangeinwetwellairspacevolumewasnotthecorrection ofanerrorbutwasduetoarefinement ofthecontainment inputstomitigatetheshort-term pressurespikedrivingthePavalue.b.Asdescribed below,theadditional airspacevolumeisassociated withanadditional 2feetofairspaceheightinthewetwellbelowtheHCUfloor.Thepeakcontainment accidentpressure, Pa,wascalculated tobe14.8psigaspartoftheGGNSExtendedPowerUprate(EPU).Thecalculated peakpressureoccursduringaveryshortpressurespikeassociated withcompression ofthedrywellairemergingfromthesuppression poolinthelocalized regionundertheHCUfloor.InReference 1,Entergyprovidedthebasisforwhythisspikeneednotbeconsidered forPa;however,theNRCstaffdisagreed andthisspikebecamethebasisfortheGGNSPavalueof14.8psiginTechSpec5.5.12.Thispressureleftlittlemargintothecontainment designpressureof15psig.Theshort-term pressurization ofthecontainment wasre-analyzed aspartoftheMELLLA+project.Inordertogainadditional margintothedesignlimit,theimportant inputsappliedintheanalysiswerereviewedindetailforanypotential tomitigatethispressuretransient.

Thisreviewidentified aGEHassumption thatthethickness oftheHCUfloorwas3feet,whilethefloorwasactuallyonly1-footthick.TheMELLLA+analysisconsequently creditedtheadditional 2feetofelevation belowtheHCUfloor,therebyincreasing thewetwellairspacevolumeinthemodel.Considering theouterandinnercontainment radiiof41.5and62feet,theadditional volumeisover13,300cu.ft.1.

Reference:

GNRO-2011/00052, datedJune23,2011 Enclosure 4GGNSResponsetoRAI-1and5Reference 2,Section3.9.3states:"Consequently, suppression poolsuctionismorelimitingforRCiCNPSH.GGNScalculations demonstrate thattheRCiCpumpwouldhaveadequateNPSHandlowsuctionpressuretripmarginsgivenasuppression poolwatertemperature of140°F."Page2of2(a)WhatistheRCiCpumpNPSHmarginwhenthesuppression pooltemperature is140°F?(b)WhathappenswhentheRCICpumptripsonalowsuctionpressureorinadequate NPSHmargin,Le.,isthepumpallowedtotriporsuctionistransferred toadifferent sourcebeforethesuctionpressurereachesthetripsetpoint?

GGNSResponse(a)Atasuppression pooltemperature of140degreesF,theNPSHavailable atminimumpoollevelis24feetwhichisequaltotheNPSHrequired.

Atthispooltemperature andlevel,thereisnoadditional NPSHmargin.(b)Thepreferred suctionsourceforRCiCisalwaystheCondensate StorageTank(CST)andRCiCisnormallylineduptotheCST.AlthoughRCiCtripsonlowsuctionpressure, suctionisautomatically transferred tothesuppression poolfromtheCSTbasedonSuppression Poollevelwellbeforelowsuctionpressureoccurs.