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#REDIRECT [[GNRO-2014/00051, Response to Request for Additional Information Regarding Maximum Extended Load Line Limit Plus Amendment Request Dated 7/2/2014]]
| number = ML14226B001
| issue date = 08/14/2014
| title = 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
| author name = Mulligan K J
| author affiliation = Entergy Operations, Inc
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000416
| license number = NPF-029
| contact person =
| case reference number = GNRO-2014/00051, TAC MF2798
| package number = ML14227A204
| document type = Letter
| page count = 15
| project = TAC:MF2798
}}
 
=Text=
{{#Wiki_filter:QEnclosure1containsPROPRIETARYinformationGNRO-2014/00051August14,2014U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,DC20555-0001EntergyOperations,Inc.P.O.Box756PortGibson,MS39150KevinMulliganSiteVicePresidentGrandGulfNuclearStationTel.(601)437-7400SUBJECT:ResponsetoRequestforAdditionalInformationRegardingMaximumExtendedLoadLineLimitPlusAmendmentRequest,dated7/2/2014.GrandGulfNuclearStation,Unit1DocketNo.50-416LicenseNo.NPF-29REFERENCES:1ElectronicRequestforAdditionalInformationRegarding"MaximumExtendedLoadLineLimitPlus"AmendmentRequestDated7/2/2014(TACMF2798)2EntergyLetter,"MaximumExtendedLoadLineLimitAnalysisPlus(MELLLA+)LicenseAmendmentRequest,"GNRO-2013/00012,datedSeptember25,2013(ADAMSAccessionNo.ML13269A140).DearSirorMadam:EntergyOperations,Inc.isprovidingintheEnclosuresaresponsetotheReference1RequestforAdditionalInformation(RAI).Enclosure1containsproprietaryinformationasdefinedby10CFR2.390.GeneralHitachi(GEH),astheowneroftheproprietaryinformation,hasexecutedtheenclosedaffidavit,whichidentifiesthattheenclosedproprietaryinformationhasbeenhandledandclassifiedasproprietary,iscustomarilyheldinconfidence,andhasbeenwithheldfrompublicdisclosure.TheproprietaryinformationwasprovidedtoEntergyinaGEHtransmittalthatisreferencedbytheaffidavit.Theproprietaryinformationhasbeenfaithfullyreproducedintheenclosedsuchthattheaffidavitremainsapplicable.GEHherebyrequeststhattheenclosedproprietaryinformationbewithheldfrompublicdisclosureinaccordancewiththeprovisionsof10CFR2.390and9.17.InformationthatisnotconsideredproprietaryisprovidedinEnclosure2.Enclosure3containsanaffidavitwhichidentifiesthattheinformationcontainedinEnclosure1hasbeenhandledandclassifiedasproprietarytoGEH.OnbehalfofGEH,EntergyrequeststhatEnclosure1bewithheldfrompublicdisclosureinaccordancewith10CFR2.390(b)(1).WhenEnclosure1isremovedfromthisletter,theentiredocumentisNON-PROPRIETARY GNRO-2014-00051Page2of2Thislettercontainsnonewcommitments.Ifyouhaveanyquestionsorrequireadditionalinformation,pleasecontactMr.JamesNadeauat601-437-2103.Ideclareunderpenaltyofperjurythattheforegoingistrueandcorrect;executedonAugust14,2014.Sincerely,Enclosures:1GEH-GGNS-AEP-641ProprietaryResponsestotheRequestforAdditionalInformation2GEH-GGNS-AEP-641Non-ProprietaryResponsestotheRequestforAdditionalInformation3GEHAffidavitforEnclosure14GGNSResponsetoRAI-1and5cc:withEnclosuresU.S.NuclearRegulatoryCommissionAnN:Mr.MarcL.DapasRegionalAdministrator,RegionIV1600EastLamarBoulevardArlington,TX76011-4511U.S.NuclearRegulatoryCommissionAnN:Mr.A.Wang,NRR/DORLMailStopOWFN/8G14Washington,DC20555-0001NRCSeniorResidentInspectorGrandGulfNuclearStationPortGibson,MS39150StateHealthOfficerMississippiDepartmentofHealthP.O.Box1700Jackson,MS39215-1700
 
==Enclosure==
2toGNRO-2014/00051GEH-GGNS-AEP-641Non-ProprietaryResponsestotheRequestforAdditionalInformation ENCLOSURE2GEH-GGNS-AEP-641ResponsestoSCVBRAls2,3,4,and6inSupportofGGNSMELLLA+LARNon-ProprietaryInformation-ClassI(Public)INFORMATIONNOTICEThisisanon-proprietaryversionofEnclosure1ofGEH-GGNS-AEP-641whichhastheproprietaryinformationremoved.Portionsofthedocumentthathavebeenremovedareindicatedbyanopenandclosedbracketasshownhere[[]].
 
==Enclosure==
2Non-ProprietaryInformation-ClassI(Public)GEH-GGNS-AEP-641RAI-2Page1of4Theproposedrevisedwetwellairspacevolume(asapartoftheoverallwetwellvolume)isaninputparametertothefollowinganalyses:(a)Longtermcontainmentpressureandtemperatureresponse,(b)Longtermsuppressionpooltemperatureresponsefornetpositivesuctionhead(NPSH),and(c)NPSHanalysisforresidualheatremoval(RHR)andcorespray(CS)pumpswhichisimpactedby(b).Pleasedescribetheimpactoftheincreaseinthewetwellairspacevolumeontheseanalyses,andprovideresults.GEHResponseInthemaximumextendedloadlinelimitanalysisplus(MELLLA+)analyses,onlythevolumebelow'thehydrauliccontrolunit(HCU)floorwasincreased;thecorrespondingchangewasnotmadeinthecontainmentvolume.ThisadditionalvolumebelowtheHCUfloorislessthan10/0ofthecontainmentvolume,andanyeffectofthelongtermanalysesissmall.Thelongtermanalysesmodelthecontainment(volumeoutsidethedrywell)[[]]Itcanbededucedfromthefirstlawofthermodynamicsthatahigherpressureandhighertemperaturewillresultifthecontainmentvolumeisdecreasedforthesamemassandenergyaddedtotheairspacefromabreak.Therefore,ignoringtheadditionalfreevolumeintheexistinglongtermcontainmentpressureandtemperaturecalculationsisconservativewithrespecttothepressureandairspacetemperaturecalculations.Althoughtheeffectmaybeverysmall,overpredictingthecontainmentpressurealsoresultsinamoreconservativesuppressionpooltemperatureduetolessevaporationthanactual.Theconservatisminthelongtermcontainmentpressuredoesnothaveanadverseeffectontheavailablenetpositivesuctionhead(NPSH)becausetheGrandGulfNuclearStation(GGNS)NPSHanalysesdonottakecreditforcontainmentoverpressure.
 
==Enclosure==
2Non-ProprietaryInformation-ClassI(Public)GEH-GGNS-AEP-641RAI-3Page2of4Assumingtheoverallcontainmentvolumeisthesameasinthecurrentanalysis;theproposedincreaseinthewetwellairspacevolumeby13,192ft3shouldresultinoneorbothofthefollowing:(a)Decreaseinthesuppressionpoolvolumeby13,192fforless,whichwouldimpactitsheightsatlowandhighlevelandventsubmergence.(b)Decreaseinthecontainmentvolumeabovehydrauliccontrolunit(HCU)floorlevelby13,192ft3orless.Pleasedescribetheimpactofthechangesinaboveparametersonthecontainmentanalyseswhichusethemasinputs,andprovideresults.Incasetheoverallcontainmentvolumehasincreased,pleaseprovidereasonsanditsimpactontheanalyseswhichusesitasinputandprovideresults.GEHResponse(a)TheincreaseinthefreewetwellvolumeisduetousingamoreaccurateHCUfloorthicknessandaffectsonlytheairspacevolumebelowtheHCUfloor.Thereisnochangeinthesuppressionpoolvolumeorlevel.(b)ThecontainmentvolumedidnotchangeintheMELLLA+analyses;onlytheairspacevolumebelowtheHCUfloorincreased.ThepresenceoftheHCUfloorisaccountedforinaconservativemannerintheshorttermanalyses.[[]]Giventhisfeatureofthemethod,thereductioninthevolumeabovetheHCUfloordoesnotenterintothecalculations.Becausethecontainmentvolumeremainsthesame,theshorttermresultsarenotaffectedbythereductioninthevolumeabovetheHCUfloor.
 
==Enclosure==
2Non-ProprietaryInformation-ClassI(Public)GEH-GGNS-AEP-641RAI-4Page3of4Itappearsthatthecurrentshorttermcontainmentpressureandtemperatureresponseareimpactedby(i)revisedM&EreleaseunderMELLLA+operation,and(ii)theincreaseinthewetwellairspacevolumewhichisnotrelatedwithMELLLA+operation.(a)Whataretheparametersotherthan(i)and(if)thathaveimpactedtheshorttermcontainmentpressureandtemperatureresponse?(b)Providecontainmentpressureandtemperatureresponseresults(peakvaluesandprofiles)assumingrevisedM&EreleaseunderMELLLA+operationandwithallotherassumptionsandinputparametersincludingwetwellairspacevolumesameasinAOR.GEHResponse(a)ThefollowingparametersaredifferentintheMELLLA+analysisascomparedtotheextendedpoweruprate(EPU)analysisinadditiontothechangeinvolumebelowtheHCUfloor:themainsteamlineflowlimiterareaandtheHCUfloorarea.(b)Themostlimitingpower/flowpointduringMELLLA+operationisthesameasduringCLTPoperation.Therefore,thedifferencesshowninTable4-3betweentheCLTPandMELLLA+resultsareduesolelytotherefinementsintheinputs,notduetoMELLLA+operation.TheresultsforMELLLA+operationwouldbethesameasthoseintheanalysisofrecord(AOR),withallotherassumptionsandinputparameters,includingwetwellairspacevolume,thesameasintheAOR.
 
==Enclosure==
2Non-ProprietaryInformation-Class[(Public)GEH-GGNS-AEP-641RAI-6Page4of4RefertoReference2,Section4.1.2,sincetheincreaseinthewetwellairspacevolumeisnotMELLLA+related,pleaseprovidethefollowinginformation(a)Section4.1.2.1;doestheLoeAloadsremainboundingunderMELLLA+operationwithoutthechangeinthewetwellairspacevolume?(b)Section4.1.2.4;doestheSRVcontainmentdynamicloadsremainboundingunderMELLLA+operationwithoutthechangeinthewetwellairspacevolume?GEHResponse(a)ThelimitingMELLLA+power/flowpointisthesameasthelimitingEPUpower/flowpoint.Therefore,theloadsevaluationsperformedforthemostlimitingpointinthecurrentlicensingbasiswithoutachangeinthecontainmentvolumeareapplicabletotheMELLLA+operationandremainbounding.(b)TheSRVloadsarenotaffectedbyMELLLA+operationasstatedinSection4.1.2.4.Therefore,theSRVcontainmentdynamicloadsremainboundingunderMELLLA+conditionswithoutthechangeinthewetwellairspacevolume.
 
==Enclosure==
3toGNRO-2014/00051GEHAffidavitforEnclosure1 GE-HitachiNuclearEnergyAmericasLLCAFFIDAVITI,JamesF.Harrison,stateasfollows:(1)IamtheVicePresident,RegulatoryAffairs,FuelLicensing,GE-HitachiNuclearEnergyAmericasLLC("GEH"),andhavebeendelegatedthefunctionofreviewingtheinformationdescribedinparagraph(2)whichissoughttobewithheld,andhavebeenauthorizedtoapplyforitswithholding.(2)TheinformationsoughttobewithheldiscontainedinEnclosure1ofGEHletter,GEH-GGNS-AEP-641,"GEHResponsestoMELLLA+SCVBRequestsforAdditionalInformation2,3,4,and6,"datedJuly22,2014.TheGEHproprietaryinformationinEnclosure1,whichisentitled"ResponsestoSCVBRAIs2,3,4,and6inSupportofGGNSMELLLA+LAR,"isidentifiedbyadottedunderlineinsidedoublesquarebrackets...Figuresandlargeobjectsareidentifiedwithdoublesquarebracketsbeforeandaftertheobject.Ineachcase,thesuperscriptnotationn:referstoParagraph(3)ofthisaffidavit,whichprovidesthebasisfortheproprietarydetermination.(3)Inmakingthisapplicationforwithholdingofproprietaryinformationofwhichitistheownerorlicensee,GEHreliesupontheexemptionfromdisclosuresetforthintheFreedomofInformationAct("FOIA"),5U.S.C.Sec.552(b)(4),andtheTradeSecretsAct,18U.S.C.Sec.1905,andNRCregulations10CFR9.l7(a)(4),and2.390(a)(4)fortradesecrets(Exemption4).Thematerialforwhichexemptionfromdisclosureisheresoughtalsoqualifiesunderthenarrowerdefinitionoftradesecret,withinthemeaningsassignedtothosetermsforpurposesofFOIAExemption4in,respectively,CriticalMassEnergyProjectv.NuclearRegulatoryCommission,975F.2d871(D.C.Cir.1992),andPublicCitizenHealthResearchGroupv.FDA,704F.2d1280(D.C.Cir.1983).(4)Theinformationsoughttobewithheldisconsideredtobeproprietaryforthereasonssetforthinparagraphs(4)a.and(4)b.Someexamplesofcategoriesofinformationthatfitintothedefinitionofproprietaryinformationare:a.Informationthatdisclosesaprocess,method,orapparatus,includingsupportingdataandanalyses,where.preventionofitsusebyGEH'scompetitorswithoutlicensefromGEHconstitutesacompetitiveeconomicadvantageoverothercompanies;b.Informationthat,ifusedbyacompetitor,wouldreducetheirexpenditureofresourcesorimprovetheircompetitivepositioninthedesign,manufacture,shipment,installation,assuranceofquality,orlicensingofasimilarproduct;c.Informationthatrevealsaspectsofpast,present,orfutureGEHcustomer-fundeddevelopmentplansandprograms,resultinginpotentialproductstoGEH;d.Informationthatdisclosestradesecretorpotentiallypatentablesubjectmatterforwhichitmaybedesirabletoobtainpatentprotection.AffidavitforGEH-GGNS-AEP-641Page10f3 GE-HitachiNuclearEnergyAmericasLLC(5)Toaddress10CFR2.390(b)(4),theinformationsoughttobewithheldisbeingsubmittedtoNRCinconfidence.TheinformationisofasortcustomarilyheldinconfidencebyGEH,andisinfactsoheld.Theinformationsoughttobewithheldhas,tothebestofmyknowledgeandbelief,consistentlybeenheldinconfidencebyGEH,notbeendisclosedpublicly,andnotbeenmadeavailableinpublicsources.Alldisclosurestothirdparties,includinganyrequiredtransmittalstotheNRC,havebeenmade,ormustbemade,pursuanttoregulatoryprovisionsorproprietaryorconfidentialityagreementsthatprovideformaintainingtheinformationinconfidence.Theinitialdesignationofthisinformationasproprietaryinformation,andthesubsequentstepstakentopreventitsunauthorizeddisclosure,areassetforthinthefollowingparagraphs(6)and(7).(6)Initialapprovalofproprietarytreatment*ofadocumentismadebythemanageroftheoriginatingcomponent,whoisthepersonmostlikelytobeacquaintedwiththevalueandsensitivityoftheinformationinrelationtoindustryknowledge,orwhoisthepersonmostlikelytobesubjecttothetermsunderwhichitwaslicensedtoGEH.(7)Theprocedureforapprovalofexternalreleaseofsuchadocumenttypicallyrequiresreviewbythestaffmanager,projectmanager,principalscientist,orotherequivalentauthorityfortechnicalcontent,competitiveeffect,anddeterminationoftheaccuracyoftheproprietarydesignation.DisclosuresoutsideGEHarelimitedtoregulatorybodies,customers,andpotentialcustomers,andtheiragents,suppliers,andlicensees,andotherswithalegitimateneedfortheinformation,andthenonlyinaccordancewithappropriateregulatoryprovisionsorproprietaryorconfidentialityagreements.(8)Theinformationidentifiedinparagraph(2),above,isclassifiedasproprietarybecauseitcontainsthedetailsofGEHmethodology.Thesemethods,techniques,anddataalongwiththeirapplicationtothedesign,modification,andanalyseswereachievedatasignificantcosttoGEH.ThedevelopmentoftheevaluationprocessesalongwiththeinterpretationandapplicationoftheanalyticalresultsisderivedfromtheextensiveexperiencedatabasesthatconstituteamajorGEHasset.(9)PublicdisclosureoftheinformationsoughttobewithheldislikelytocausesubstantialharmtoGEH'scompetitivepositionandforecloseorreducetheavailabilityofmakingopportunities.TheinformationispartofGEH'scomprehensiveBWRsafetyandtechnologybase,anditscommercialvalueextendsbeyondtheoriginaldevelopmentcost.Thevalueofthetechnologybasegoesbeyondtheextensivephysicaldatabaseandanalyticalmethodologyandincludesdevelopmentoftheexpertisetodetermineandapplytheappropriateevaluationprocess.Inaddition,thetechnologybaseincludesthevaluederivedfromprovidinganalysesdonewithNRC-approvedmethods.Theresearch,development,engineering,analyticalandNRCreviewcostscompriseasubstantialinvestmentoftimeandmoneybyGEH.Theprecisevalueoftheexpertisetodeviseanevaluationprocessandapplythecorrectanalyticalmethodologyisdifficulttoquantify,butitclearlyissubstantial.GEH'scompetitiveadvantagewillbelostifitsAffidavitforGEH-GGNS-AEP-641Page2of3 GE-HitachiNuclearEnergyAmericasLLCcompetitorsareabletousetheresultsoftheGEHexperiencetonormalizeorverifytheirownprocessoriftheyareabletoclaimanequivalentunderstandingbydemonstratingthattheycanarriveatthesameorsimilarconclusions.ThevalueofthisinformationtoGEHwouldbelostiftheinformationweredisclosedtothepublic.Makingsuchinformationavailabletocompetitorswithouttheirhavingbeenrequiredtoundertakeasimilarexpenditureofresourceswouldunfairlyprovidecompetitorswithawindfall,anddepriveGEHoftheopportunitytoexerciseitscompetitiveadvantagetoseekanadequatereturnonitslargeinvestmentindevelopingandobtainingtheseveryvaluableanalyticaltools.Ideclareunderpenaltyofperjurythattheforegoingistrueandcorrect.Executedonthis22nddayofJuly2014......JamesF.HarrisonVicePresident,FuelLicensingRegulatoryAffairsGE-HitachiNuclearEnergyAmericasLLC3901CastleHayneRoadWilmington,NC28401james.harrison@ge.comAffidavitforGEH-GGNS-AEP-641Page3of3
 
==Enclosure==
4toGNRO-2014/00051GGNSResponsetoRAI-1and5
 
==Enclosure==
4GGNSResponsetoRAI-1and5Page1of2RAI-lReference2,Table4-1indicatesthewetwellairspacevolumeintheproposedanalysisisincreasedby13,192fe(149,978feminus136,786fe)fromthecurrentanalysis.Pleaseprovidethefollowinginformation:(a)Isthechangeinwetwellairspacevolumecorrectionofanerror?(b)Incasethechangeisnotcorrectionofanerror,pleasedescribethechangesinthecontainmentconfigurationthatprovidesadditionalairspacevolumeinthewetwell.GGNSResponsea.Thechangeinwetwellairspacevolumewasnotthecorrectionofanerrorbutwasduetoarefinementofthecontainmentinputstomitigatetheshort-termpressurespikedrivingthePavalue.b.Asdescribedbelow,theadditionalairspacevolumeisassociatedwithanadditional2feetofairspaceheightinthewetwellbelowtheHCUfloor.Thepeakcontainmentaccidentpressure,Pa,wascalculatedtobe14.8psigaspartoftheGGNSExtendedPowerUprate(EPU).ThecalculatedpeakpressureoccursduringaveryshortpressurespikeassociatedwithcompressionofthedrywellairemergingfromthesuppressionpoolinthelocalizedregionundertheHCUfloor.InReference1,EntergyprovidedthebasisforwhythisspikeneednotbeconsideredforPa;however,theNRCstaffdisagreedandthisspikebecamethebasisfortheGGNSPavalueof14.8psiginTechSpec5.5.12.Thispressureleftlittlemargintothecontainmentdesignpressureof15psig.Theshort-termpressurizationofthecontainmentwasre-analyzedaspartoftheMELLLA+project.Inordertogainadditionalmargintothedesignlimit,theimportantinputsappliedintheanalysiswerereviewedindetailforanypotentialtomitigatethispressuretransient.ThisreviewidentifiedaGEHassumptionthatthethicknessoftheHCUfloorwas3feet,whilethefloorwasactuallyonly1-footthick.TheMELLLA+analysisconsequentlycreditedtheadditional2feetofelevationbelowtheHCUfloor,therebyincreasingthewetwellairspacevolumeinthemodel.Consideringtheouterandinnercontainmentradiiof41.5and62feet,theadditionalvolumeisover13,300cu.ft.1.Reference:GNRO-2011/00052,datedJune23,2011
 
==Enclosure==
4GGNSResponsetoRAI-1and5Reference2,Section3.9.3states:"Consequently,suppressionpoolsuctionismorelimitingforRCiCNPSH.GGNScalculationsdemonstratethattheRCiCpumpwouldhaveadequateNPSHandlowsuctionpressuretripmarginsgivenasuppressionpoolwatertemperatureof140°F."Page2of2(a)WhatistheRCiCpumpNPSHmarginwhenthesuppressionpooltemperatureis140°F?(b)WhathappenswhentheRCICpumptripsonalowsuctionpressureorinadequateNPSHmargin,Le.,isthepumpallowedtotriporsuctionistransferredtoadifferentsourcebeforethesuctionpressurereachesthetripsetpoint?GGNSResponse(a)Atasuppressionpooltemperatureof140degreesF,theNPSHavailableatminimumpoollevelis24feetwhichisequaltotheNPSHrequired.Atthispooltemperatureandlevel,thereisnoadditionalNPSHmargin.(b)ThepreferredsuctionsourceforRCiCisalwaystheCondensateStorageTank(CST)andRCiCisnormallylineduptotheCST.AlthoughRCiCtripsonlowsuctionpressure,suctionisautomaticallytransferredtothesuppressionpoolfromtheCSTbasedonSuppressionPoollevelwellbeforelowsuctionpressureoccurs.
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