ML17264B045

Rev 3 to 86-1234820-03, Low Temp Overpressure Analyses Summary.

ML17264B045
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Site:	Ginna
Issue date:	09/19/1997
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86-1234820-03, 86-1234820-03-R03, 86-1234820-3, 86-1234820-3-R3, NUDOCS 9710020178
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Attachment VIILTOPEnableTemperature Calculation (FirstuseofLTOPenabletemperature methodology) 97i0020i78 970929PDRADGCK05000244iPPDR\~

4 20697-3(12/95)CALCULATIONAL SUMMARYSHEET(CSS)DOCUMENTIDENTIFIER 86-123482043 TITLELOWTEMPERATURE OVERPRESSURE ANALYSESSUMMARYNAMEMBBakerSIGNATURE TITLEEngineerIVREPORTPREPAREDBY:GATEI/IIREVIEWEDBY:NAMEGJWissinger slGNATURE r/7(in7'.

jTITLEEngineer!VGATEfI!TI$1COSTCENTER41Q1QREFPAGE($)32bPURPOSEANDSUMMARYOFRESULTS:TMSTATEMENT:

REVIEWERINDEPENDENCE Framatome Technologies Inc.,performed thelowtemperature overpressure eventanalysesfortheRochester GasandElectric(RGE)R,E.Ginna NuclearPowerStation;afterthesteamgenerators werereplacedwithBWI<esigned generators.

Inthiseffort,aspectrumofLTOPeventstoboundallpossibleoperational configurations isanalyzedandtheresultscomparedtoAppendixGlimitsandtheRHRpressurelimit:RGEhasreceivedapprovaltoutilizeASMECodeCaseN-514,whichamongotherthingsraisestheallowable pssureto110%oftheAj3pendix Glimit.ostlimitingmassadditioncaseIsacasewiththreechargingpuigsturnedonwhentheprimarysystemisat60'FwithtwoRCpumpsrunning.Thiscaseresultedinapeakreactorvesselpressureof587A4psiawhichisbelowthelimitatthistemperature.

Themostlimitingheatadditioncaseiswiththeprimarysystemat60'F,withaninitialpressureof329.7psia.OneRCpumpisturnedonwiththesecondary systematatemperature of50'Fhigherthantheprimary.Thepeakreactorvesselpressureinthistransient is551.3psiawhichisbelowthelimit.ThelimitingeventfortheRHRsystemoccursat280'F,whentwoRHRpumpspmtotal.Inthisheatadditioncase,thepeakRHRsystempressurereacllowableof674.7psia.cV&0lSN~NSgr64%NY a'-Thisrevisionisacompletereplacement ofRevision02.'0SPCI0APPROVEDSUBMITflVALOCCUMEIIT MANUFACTU

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AIPaovALorrtgscocUMENTcccsNoTREUEYESUPPLIERFTIOMFULLCOMPUAtlCE t>IIHCONTRACTORPIHASDERRCOUIRE>ACIITS SY'ATC:ROCIIESTER GAS8ELECTRICCORP.THISBOCUMEI!ar(EGNTAINS ASVERIFIEDPRIORTOUSEONSAFETY-RELATED WORKYES()NO()PAGE1OF88AND32a&32b

ROCHESTER GASANDELECTRICCORPORATION Inter-Office Correspondence GinnaStationSeptember 23,1997

SUBJECT:

ApprovalofVendorTechnical Document"LowTemperature Overpressure AnalysesforRGEEGinnaPlant"86-1234820-03, "LowTemperature Overpressure AnalysesSummaryReport"TO:FileFTINo.86-1234820-03 Inaccordance withEngineering Procedure EP-3-P-154, rev.0,thepurposeofthismemorandum istoidentifythatthesubjectdocuments havebeenreviewedandareacceptable foruseastheanalysisofrecordfortheLowTemperature Overpressure Protection System(LTOPS)forGinna.Specifically:

Theassumptions usedinthecalculation areappropriate fortheGinnaStationwitheitherWestinghouse Model44steamgenerators orBWIRSGs.2.Thetransients selectedarethecorrectlimitingtransients fortheGinnaLTOPSdesign.Severalcaseswererunwhichdemonstrate boundingconditions'pecifically:

a.Case2Aboundsallcrediblemassadditiontransients forwhichprotection isprovidedbythepressurizer PORVs.b.Cases3and4boundallcrediblemassadditiontransients forwhichprotection isprovidedbyaRCSvent>1.1in'.c.Case5boundsallcredibleheatadditioncases.3.4.d.Cases7and9demonstrate adec{uate protection fortheRHRsystem.Sincepeakpressureforalltransients islessthan800psig,PORVtailpipewaterhammer isnotaconcern.TheanalysisisdoneforanLTOPSactuation setpointof430psig.Thisallowssufficient marginfromanominalsetpointof410psigtoaccountforinstrument error.

Memo:Page2Date:September 23,1997

Subject:

FileFTINo.86-1234820-03 5.Alowpressurelimit,toprotectanRCPseal,cannotbeaccommodated byasingleLTOPSsetpointwithoutunacceptable highpressureresults.Therefore, thiscriteriaiswaived.Thefollowing commentsareapplicable totheapprovalofthisdocumentandhavebeensomarkedinthedocument:

1.Page20,Table7-The'peakpressureinthereactorvesselshouldbe554.42psia.~2.Page21,Table8-Thepeakpressureinthereactorvesselshouldbe413.48psia.3.Page22,Table9-Thepeakpressureinthereactorvesselshouldbe396.72psia.Section7.0pp28-29-Severalvaluesforpeakpressures areincorrectly summarized.

Thesevalueshavebeenmarkedandcorrected inthetext.Thesecorrections areconsidered minortypographical errorswhichdonotwarrantavendorrevision.

BrianFlynnPrimarySystemsRobertE.isEngineer, NS&LGeorgWrobelManager,NSELrZuyeyxc:DocumentControl FTINon-Proprietary 86-1234820-03 LOWTEMPERATURE OVERPRESSURE ANALYSESSUMMARYREPORTPreparedforRochester Gas5EtectricCorporation Preparedby:Reviewedby:Approvedby:MBaker,EngineerIVGJ'Wissinger, EngineerIVJ.J.Cudlin, Manager,AnalysisServicesUnitDa~e:/~0Date:f'~'IlFRAMATOME TECHNOLOGIES INC.,LYNCHBURG, VA.

FTlNon-Proprietary 86-123482043

.RECORDOFREVISIONS REVISIONNO.DESCRIPTION DATE000102OriginalissueCompleterevisiontointegrate additional runsandconclusions basedontheadditional runs-allpagesrevisedMinorchangesinmassadditioncaseresults-revised pages1,3,19,20,21,30 and31March1995June1997July199703Thisrevisionincorporates thefactSeptember 1997thatRGEreceivedapprovalforASMECodeCaseN-514,whichallowsthepeakpressuretobe110%oftheAppendixGlimit.ThisRevisioncompletely replacesrevision02,Revisionbarsareinthemargin.

FTINon-Proprietary 86-1234820-03 TABLEOFCONTENTS

1.0INTRODUCTION

...2.0DISCUSSION OFLTOPEVENTS2.1LTOPEVENTSINITIATED BYMASSADDITION.

2.2LTOPEVENTSINITIATED BYHEATADDITION3.0EVENTSANALYZED.

4.0 ACCEPTANCE

CRITERIA....5.0METHODOLOGY 6.0ANALYSIS6.1MASSADDITIONCASES...6.2HEATADDITIONCASES7.0SUMMARYANDCONCLUSIONS

8.0REFERENCES

-

PLOTSOFTHERESULTS...5.5~5.....6.............

~...715....181823....2932b33 FTINon-Proprietary 86-123482043

1.0INTRODUCTION

Framatome Technologies Inc.(FTI)(formerly B&WNuclearTechnologies) updatedtheanalysisofthelowtempeiature overpressure (LTOP)eventsfortheRochester GasandElectric(RGE)R.E.GinnaNuclearPowerStation(hereafter referredtoastheGinnaplant).TheanalysesshowninthisdocumentbecomethenewanalysesofrecordfortheGinnaStation.RGEhasreceivedapprovaltoutilizeASMECodeCaseN-514,whichamongotherthingsraisestheallowable pressureto110%oftheAppendixGlimit.TheresultsoftheanalysesofthelimitingLTOPeventswerecomparedwith110%ofthe10CFR50AppendixGandresidualheatremovalsystem(RHR) overpressure limits.Inallcases,thepeakreactorvesselandRHRsystempressures werewithintheapplicable limits.Thepurposeofthisrevisionistopresenttheresultsofadditional casesthatshowtheeffectsofvariouscombinations ofreactorcoolant(RC)pumpandRHRpumpoperation.

2.0 DISCUSSION

OFLTOPEVENTSTheUnitedStatesNuclearRegulatory Commission (USNRC)Regulatory Guide1.99,Revision2,datedMay1988(Reference 1)discusses theeffectsofneutronirradiation embrittlement oflowalloysteelsusedinthereactorvessel.AppendixGofChapter10,Part50oftheCodeofFederalRegulations giv'esthefracturetoughness requirements forthereactorvesselunderlowtemperature conditions.

DuringLTOPevents,thereactorvesseltemperatures andpressures approachtheAppendixGlimits.TheLTOPsystemisdesignedtoensurethatthereactorvesselembrittlement limitsarenotexceeded.

LTOPeventscanoccurduringcoldshutdown, heatuporcooldown.

Toprovideprotection againstexceeding theAppendixGlimits,thePowerOperatedReliefValves(PORV)onthepressurizer areresettoalowsetpoint, wheneverthereactorcoolantsystemtemperature islessthan,322'F.

Twotypesofoverpressurization eventsareconsidered.

Thefirsttypeofeventisamassadditioneventandthesecondtypeofeventisaheatadditionevent.2.1LTOPEVENTSINITIATED BYMASSADDITIONThemassadditioneventsarecharacterized byadditionofmasstoawater-solid primarysystem.Thiscanoccurduringashutdownsituation, ifthechargingpumpsorifthesafetyinjection(SI) pumpsarestartedinadvertently.

Technical Specification I'

'CI FTINon-Proprietary 86-123482043limitsonSlpumpoperability anddischarge valvepositioneliminate themassinjection caseduetoahighheadSlpumpstart,unlessprotection isprovidedbyaventpathofatleast1.1squareinches.Withnovent;withthreeSlpumpsinoperable byTechnical Specification limits,aninadvertent SlsignalwillnotcauseanSlpumpstart.Sincethepossibility ofthestartupofthreechargingpumpswithletdownisolatedcanbepostulated, thiscaseisanalyzedasamass-addition event,whenprotection isprovidedbyonlythePORVs.Thelowerlimitoftheprimarytemperature formassadditionbychargingpumpoperation is60'F.Abovethistemperature, thepossibility existsthattwoRCpumpsmayberunningandthreechargingpumpsmaybeinadvertently started.Thiscasealsohasbeenanalyzed, withaconservative primarytemperature of60'FandcomparedwiththeASMECodeCaseN-514limitat60'F,toshowacceptability.

ThisisthemostlimitingmassadditioncaseforAppendixGcriterion.

Withaprimaryventofsize1.1squareinchesopentotheatmosphere, startupofoneSlpumpisallowed.Thismassadditioneventisanalyzedatprimarytemperatures of60'Fand212'FtoboundtherangeofpossibleRCconditions inthisconfiguration withnoRCpumpsrunning.Whentheventisopen,thePORVsarenotcreditedaspressurelimitingdevices.2.2LTOPEVENTSINITIATED BYHEATADDITIONTheheatadditioneventsarecharacterized byanadditionofheattoawater-solid primarysystem.Heatcanbeaddedtotheprimarysystembytheactuation ofpressurizer heaters,lossoftheresidualheatremovalsystem(RHR)cooling,ortwotypesofreactorcoolant(RC)pumpstartupswhileatemperature asymmetry existsintheRCloops.Theinadvertent actuation ofthepressurizer heaterswhenthepressurizer iswatersolidwillcauseaslowriseinthewatertemperature andincieaseinpressure, iftheinstalled automatic pressurecontrolequipment isnotinservice.Sincethispressuretransient isveryslow,theoperatorshouldrecognize andterminate thetransient beforeanunacceptable pressureisreached.Iftheoperatordoesnotterminate the'ransient, thepressurewillincreaseandwillbeterminated bythePORVwithlittleornoovershoot abovethePORVsetpoint.

Thiscaseisnotsignificant tothedesignoftheLTOPsystem.ThelossofRHRcoolingwhenthereactorcoolantsystem(RCS) iswatersolidcouldbecausedbyalossofflowmalfunction inthecomponent coolingwaterorservicewatersystems,ortheclosureoftheRHRsinletisolation valves.Thiswouldcauseaslowriseintemperature andpressuresincetherewouldbeacontinual releaseofcoreresidualheatintothereactorcoolantwithnoheatremoval.Thistransient isalsoveryslowandtheoperatorhassufficient timetomitigatetheevent.Thefirsttypeoftemperature asymmetry canoccurifthereactorcoolantisatarelatively warmtemperature withlittleornonaturalcirculation andcoldreactorcoolantpumpsealinjection watercontinues toenterthesystem.Thecoolerinjection FTINon-Proprietary 86-123482043 waterwillsettleinapoolintheloopseal.Thepressuretransient isinitiated bystartingonereactorcoolantpump.Asthepumpcomesuptospeed,thereactorcoolantflowrateslowlyincreases intheactiveloopandthepoolofcoldwaterwillbedrawnupintothepumpanddischarged outthecoldlegpiping.Simultaneously, thepoolofcoldwaterintheinactiveloopwillflowbackwardthroughthesteamgenerator ataflowratesignificantly lessthanthatoftheactiveloop.Asthispoolofcoldwaterflowsthroughthesteamgenerator, thetemperature willincreaseduetoheattransferfromthe'secondary sideofthesteamgenerator.

Thiscausesexpansion oftheprimarysidewaterandanincreasing pressuretransient.

Thesecondtypeoftemperature asymmetry occurswhentheRCShasbeencooledwithoutsufficient circulation.

ThiscouldoccurwhentheRHRsystemisusedtocooltheRCSwithoutuseofanyreactorcoolantpumps.Undertheseconditions, thewaterinthesteamgenerator secondary sideandtheprimarysidewillbeinthermalequilibrium atatemperature higherthanthatofthereactorcoolant.IfoneRCpumpisinadvertently startedundertheseconditions, theRCSflowrateincreases andthecoldwaterfromtheRCSenterstheSGtubes.Thisresultsinthetransferofheatfromthesecondary totheprimarysystem,causingtheprimarysystemliquidtoexpandandtheprimarysystemtopressurize.

Thisisarelatively fasteventand,becauseofthetransferofheatfromthesecondary systemtotheprimarysystem,thiseventisthemostlimitingheatadditiontransient.

Intheheatadditionevents,bothRHRpumpsoronlyonemaybeoperating.

Therefore eventswithoneandtwoRHRpumpsareanalyzedatvariousinitialprimarytemperatures, toboundthelimitsofoperation.

3.0EVENTSANALYZEDAspectrumofmassadditioncaseswereanalyzed.

Themassadditioncaseshavearangeofinitialprimarytemperatures andmassadditions, simulating chargingandsafetyinjection pumpoperation atvariouspossibleinitialtemperature conditions, withassumptions onRCpumpoperation, andoperation ofRCSvent.Thelimitingmassadditioncase,theinadvertent startupofthreechargingpumps,wasanalyzedataprimarytemperature of60'FwithtwoRCpumpsoperating.

Inaddition, twocaseswithSlpumpstartupwereanalyzed, onewiththeprimarysystemat60'Fandonewithatemperature of212'F.Inthesecases,thePORVisnotcreditedforpreventing overpressurization.

Instead,a1.1squareinchventwasmodeledontopofthepressurizer, becauseSlpumpoperability iscontrolled byprocedure whentheventisopen.Theuppertemperature limitof212'Fisbasedonsaturation temperature atatmospheric conditions.

SixtydegreesisthelowerlimitoftheAppendixGcurves.Thelimitingheatadditioncaseistheinadvertent startofareactorcoolantpumpfollowing RCScooldownsolelywiththeRHRsystem.Thiseventwasanalyzedat

FTINon-Proprietary 86-1234820-03 RCStemperatures of60'F,85'F,280'Fand320'FwiththeSGliquidtemperature 50degreeshotterthantheRCS.Thevariouscombinations ofRHRsystemweremodeled.Thetransient isanalyzedat60'FsinceitisthelowerlimitoftheAppendixGlimitsandhasthelowestpressurelimitfortheacceptance criterion.

Theeventisanalyzedat320'Fbecausethisisthemaximumcredibletemperature atwhichasecondary-to-primary temperature difference of50'Fcanbeachieved.

Specifically, thereactorcoolantpumpsmaybetrippedat350'F.Withinstrument uncertainties, thetemperature couldbeashighas370'F.IftheRCSissubsequently cooledtoobtainthemaximumallowedtemperature difference (50'F),theRCpumpstartcouldoccurat320'F.ThisheatadditioneventisthemostlimitingfortheRHRoverpressurization.

ThevariouscasesrunareshowninTable1foreasyreference.

4.0 ACCEPTANCE

CRITERIA-Theacceptance criteriafortheLTOPeventsare:1.Thepressureandtemperature ofthereactorvesselcannotexceed110%ofthesteady-state AppendixGlimits(ASMECodeCaseN-514).TheAppendixGlimitsaregiveninTable2.ThistableisobtainedfromReference 2.2.ThepressureintheRHRsystemcannotexceed110percentofthedesignpressureof600psig,or660psig.

TlNon-Proprietary 23482043TABLE1LISTOFCASESCaseno.Description PrimaryRHRflowRCpumpSecondary temp.ratestatustemp.'Fgpm0/1/2OFChargingSlpumpRCSventpumpstatusstatus0/1/2/30/1/2;open/close 1.MassadditioncasePrimaryPress.329.7psia(2.MassadditioncasePrimaryPress.329.7psia3gpmRCpumpsealreturn(2a.MassadditioncasePrimarypressure329.7psia)3.MassadditioncasePrimarypressure14.7psia.Nosealreturn.4.MassadditiqncasePrimarypressure14.7psia.Nosealreturn.85.01700.0060.02000.060.02000.060.02000.0212.02000.0n/an/an/an/an/a(continued) closedclosedclosedopenopen lNon-Proprietary 234820-03 TABLE1(continued)

LISTOFCASESCaseno.Description PrimaryRHRflowRCpumpSecondary temp.ratestatustemp.'Fgpm0/1/2'FChargingpump0/1/2/3SlpumpRCSventstatusstatus0/1/2open/close 5.HeatadditioncasePrimarypressure329.7psiaNosealreturn.6.HeatadditioncasePrimarypressure329.7psiaNosealreturn.7.HeatadditioncasePrimarypressure329.7psia.8.HeatadditioncasePrimarypressure329.7psia.9.HeatadditioncasePrimarypressure329.7psia.-60.02000.085.02000.0280.02000.085.01700.0320.01700.0110.0135.0330.0135.0370.000closedclosedclosedclosedclosedNote:Inthemassadditioncases,theRHRsystemisnotmodeledexplicitly.

ThepressureintheRHRsystemisevaluated byaddingaconservative hPtothesuctionpressureatthehotleg.

FTiNon-Proprietary 86-]$348QQ0TABLE2R.E.Ginna 24EFPYCooldo]ln CurveDataPointsCooldowStcafy8T606$707580'859095IOO105IIOIIs]20125L3013514014515015516016517017$18018519019520020$2102]$22022523023$2CO2452$025526026$270275280285290295300305310315320325330335340345350355360365370375nCavesQloP54054254454$$47549SSL$54556559562565568572576580$84589594599605612619626634642652661672683696709723738754772791811&3385688190&937968100210381077III&11631211]2621318]3771440]509Is&i1660174418341931203']442262238820FT606570758085909$loo105IIO11512012$L30135140145150]5$160165170I'7518018$1901952002052]02152202252302352402452$025526026527027528028529029$300305'51$5]6518519521523$2S528530$33536539542S]65$05545$85635685745805875946016096186286386496616736877017]773475277279381686689592$9$79931030107Q]1]41160121140FT6065707$808$9095100105110115120125]30135140]4515015516016$170175180]&5.190195200205210215220225230235240245250255260265270275280285290295300P4&9490492493495497499Sol$04S065095125165195235285325375425485545615685765&55946036146256376$1665'680696714733753'775'799825852'819139479831023106511101159606$~70'75&08$9095100~105.110IIS120125]30135140145150155160165170175180185190L95200205210215220225'23023524Q24525025$265270275280285290295676694225230714735758783809838869937975101610611108115923524525025526026$270275280285290295lOOFPT46260463']65'7046646880470472904749$<77LOO480]OS483110486Ils48912O49312$130Sol,135506St1I~SS]6]SO522155$2916053616554317O551175560]&O5691851905901956O22OO61$205'2821064321S65922OP4084094104]24]g4]541842Q42242542843]435438447a5245746346947648349]500509519530554568583599616634676699724751'7808118&192010071056110&11

STEAMilNEMssvvGINNARELAPSMODELFIGURE1670865dCOdss65011O0'$3rD0$r765!Tothi"model,addedt.AHAmodel2.POAVmodel0.Chargingpumpmodel733077330$733057XHN73M37XH$273341101112=.taIi1516353t2$25017XH6733057XHN7XHQ7XN27330$4100$2OlMotothatAFWandMFWmodelsarodclctcd,heroforthoLTOPS625~$6XH$7CDOO6XH5C$3OI63M3~633OZKI$0$O5052250$10111213f415IdC$305C$3OSC$3046XH$7CX92CIMI1211151131101051002002052102$3215235ICIACPump817017S$80LEFTLOOPREACTORVESSEL20027S270265RC2eoPumpARIGHTLOOP$48$50155

FlGURE2GINNAREACTORVESSELANDCOREMODELhotlegnozzle350C5C)Co364360lookogopathupperptonum354hotlegnozzle351302352upporpfonum 36S326338coldlegnozzle324322336334C9coldlegnozzle310320316332330328375380Nota:Tgsbatwecerachannot mafol-hrhavorogaceresCcrfU44coCDICD PrimaryLoop(LTOPActiveLoop)HotLegFIGURE3RHRSYSTEMMODELPrimary(Inactive Loop)ColdLegnz00O'U$00280450453RHRpump8462Heatexchanger B463469sinkRHRReliefValve46845~452473472455461460457454RHRpumpAHeatexchanger A475456

FTINon-Proprietary 86-123482043

5.0 METHODOLOGY

TheLTOPtransient analyseswereperformed usingtheRELAP5/MOD2-B8W Version20(Reference 5)computercode,whichhasreceivedfullcertification atFramatome Technologies Incorporated(FTI).

RELAP5/MOD2 B8Wisatwo-fluid, sixequation',

nonhomogeneous, nonequilibrium thermal-hydraulic codedeveloped forbest-estimate transient analysisofpressurized waterreactorsandassociated systems.Thecodehasoptionstoconsiderequilibrium, homogeneous hydrodynamic controlvolumesandalimitedabilitytocalculate conditions forco-existing noncondensibles.

Thenumerical solutiontechnique issemi-implicit finitedifferencing.

RELAP5isahighlyflexiblecodethat,inadditiontocalculating NSSbehavior, canbeusedforsimulation ofawidevarietyofthermal-hydraulic transients'.

RELAP5/MOD2-BBW hasspecialprocessmodelsthatarenotavailable inthe'ndustryversionofthecode(Reference 3).TheonlysuchprocessmodelusedintheseLTOPanalysesistheHenry-Fauske extendedsubcooled criticalflowmodel.Forthoseinstances whenthepressurizer PORVexperienced criticalflow,theextendedHenry-Fauske criticalflowmodelisusedratherthantheRansom-Trapp model.TheextendedHenry-Fauske modelwasusedbecauseitiswidelyacceptedforuseovertherangeofconditions experienced intheseanalysesandbecausetheRansom-Trapp modeloverpredicts thetestdatausingadischarge coefficient of1.0~(Reference 3).UseoftheHenry-Fauske modelistherefore, conservative.

TheplantmodelthatwasemployedfortheLTOPanalysesincludedtwocompletereactorcoolantloopsincluding RCpumpsandsteamgenerators.

Thesecondary sideincludedsteamlines,mainsteamsafetyvalves(MSSVs),mainsteamisolation valves(MSIVs),andturbinestopvalves.AnodingdiagramoftheRELAP5/MOD2 modelisshowninFigure1.Thesteamgenerator modelusedfortheanalysesisasimulation oftheU-tubereplacement steamgenerator designedbyBWI.Thefeedwater systemsandtheauxiliary feedwater systemswerenotmodeledsincethesearenotfunctioning duringtheLTOPevents.Theprimarysystemhasareactorvesselmodelwithtwoequalandparallelcorepathsforadjusting themixingofloopflowsinthelowerplenum.ThisfeaturewasnotusedintheLTOPanalysesasthisisnotrequired.

Thecorehadsixaxialnodesandacorebypasswiththreenodes.Theupperandthelowerplenumvolumeswerecommontoboththeloops,whereasthedowncomer wassplitintotwoparallelsetofvolumes.AnodingdiagramofthereactorvesselisshowninFigure2.Thepressurizer wasmodeledasatennodeverticalpipecomponent andwasinitialized liquidsolid.OnePORVwasattachedtothetopnodeofthepressurizer.

OnlyonePORVwasmodeledbecausetheotherPORVwas15 FTINon-Proprietary 86-123482043assumedtofailclosed.ThePORVwassettoliftwhenthepumpsuctionpressureontheloopwiththepressurizer exceeded430psig,consistent withthelocationofthepressuretransmitters andinstrument error.ThePORVwassizedtodeliver49.722Ibm/ssaturated steamat2335psig.Theopeningstroketimewas1.0secondusingtheCvcharacteristics inTable3.Themodelcontained thepipingfromthePORVtothepressurizer relieftank(PRT)aswellasthePRTwitharupturedisc.ThenitrogenblanketonthePRTwasmodeled.TheRCpumpsweremodeledascentrifugal pumpswiththehomologous curvesrepresenting theperformance undervariousconditions.

Thepumpperformance curvesshownintheUFSARwereusedasthebasisfortheactiveoctantsinthispumpmodel.ThepassivemetalofthewholesystemwasmodeledfortheLTOPanalyses.

Thepassivemetalincludesthereactorvesselwalls,thereactorinternals, thefuelendfittings, thehotandcoldlegpipewalls,pressurizer walls,thesteamgenerator primarysidemetalandthesteamgenerator secondary sidemetal.Thesteamgenerator tubemetalwasmodeledaspartoftheactiveheatstructures.

ThesteamlinemetalandtheRHRsystempassivemetalwerenotmodeled.TheRHRsystemwasmodeledastwoparalleltrainswithtwoseparatepumpsandcrossconnects.

Twoheatexchangers weremodeledascontrolvolumeswithnoheatremovalsincetheheatexchangers wereassumedtomaintainaconstanttemperature intheRCSduringtheLTOPanalyses.

TheRHRreliefvalvewasattachedtotheRHRsystemnearthecoldlegconnection.

TheRHRreliefvalvewasbenchmarked forflowunderthedesignconditions.

AnodingdiagramoftheRHRsystemisshowninFigure3.Forthemassadditioncases,theprimarysystemwasinitialized at60,85,8212'F,andatapressureof315psig.Theprimaryandsecondary systemsaredecoupled sincethereisnoheattransferinthiscase.Theeventwasinitiated bystartingoneorthreechargingpumps,oroneSlpump.Theflowcapacityofeachchargingpumpis60gpm.IntheSlpumpcases,theflowrateusedforone~SlpumpisshowninTable4.Incaseswiththe1~1sq.in.ventopen,RCpumpswerenotrun,becausetheRCSisatnearatmospheric pressureandthereisinsufficient NPSHtooperatethepumps.Slinjection isusedastheinitiating eventintheventcases.Theanalysiswasterminated afterthePORVopensoranequilibrium pressurewasobtained.

ThepeakRCSpressurewascomparedwiththeacceptance criteria.

Different caseshavedifferent assumptions.

SeeTable1fordetails.

FTINon-Proprietary

'6-123482043 TABLE3CversuspositionCopesVulcanValve-ModelNumberD-100-160 Stroke%0.01.97.914.020.026.132.238.244.350.356.462.568.573.678.384.591.698.6100.00Cnormalized 0.00.0160.0670.1430.2310.3460.4740.6260.7340.8230.87,80.9240.9570.9700.9770.9850.9920.9991.0Fortheheatadditioncases,theprimarysystemwasinitialized toisothermal conditions attherequiredtemperature withnoreactorcoolantpumpoperating.

Thesecondary andprimaryfluidinthesteamgenerators wereinitialized atatemperature 50degreesabovetheprimarysystem;TheRHRsystemwasassumedtobeoperating withacapacityof1700gpmwithonepumprunning(320'Fcaseasspecified inAttachment CofReference 4)or2000gpmwithtwopumpsrunning(60'Fandthe85'Fcases,consistent withminimumflowratesundertheseconditions).

Thetransient wasinitiated bystartingareactorcoolantpumpintheloopthatcontainsthepressurizer.

Thepumpstartupcharacteristics ofTable5wereusedtobringthepumptofullspeedin17.4seconds.Theanalysiswasrununtilthepeakpressurewasobtained.

Thepeakpressures inthereactorvesselandtheRHRsystemwerecomparedwiththeacceptance criteria.

0 FTINon-Proprietary 86-123482043TABLE4FLOWVERSUSRCSPRESSUREFORONESIPUMPATTHER.E.GINNA STATIONRCSPressure, si600500400300200100SlFlow,m413440466490514536558TABLE5RCPUMPSTARTUPPROFILETime,sec0.03.506.609.713.315.817.4Seed,rm24048072096010801189fullseed6.0ANALYSISThefollowing sectionsdescribetheinitialandboundaryconditions aswellastheresultsforeachoftheeventsanalyzed.

AllvaluesweretakenfromReferences 4,687.Thecasenumberscorrespond tothoseshowninTable1.6.1MassAdditionCases6.1.1Case1Themassadditioncaseidentified asCase1isinitialized ataprimarytemperature of85'Fandaprimarypressureof315psig.Usingtheinitialpressureof315psigassuresthatthetransient iswelldefinedbythetimethePORVisactuated.

Thereactorcoolantpumpsarenotrunningandthepressurizer iswatersolid.ItisassumedthattheRHRsystemisremovingdecay18 FTlNon-Proprietary 86-1234820-03 heat,soitisnotmodelled.

Theeventisinitiated bystartingthreepumpchargingflow(180gpmor25Ib/s).Theanalysisisrunfortenminutes.ThesequenceofeventsforthiscaseisshowninTable6.PlotsofthereactorvesselpressureandpressureatRHRsystemsuctionpointinthehotlegareshownonFigures485,respectively (Reference 4).Thepeakreactorvesselpressurewas480.2psia.Theallowable

pressure, according totheAppendixGlimit(CodeCaseN-514)at85'is618.7psia.Therefore, thereis138ApsimargintotheAppendixGacceptance criterion.

TocomparethepeakpressureintheRHRsystemwiththeacceptance criterion, thepressuredropfromthehotlegtotheRHRpumpdischarge (128.1psi,fromReference 4)wasaddedtothepeakhotlegpressure.

ThiscaseyieldedapeakRHRpressureof598.4psia.Thepeakallowable pressureintheRHRsystemis674.7psia.Thisresultsina76.3psimargintotheacceptance criterion.

TheRHRflowisassumedtobe1700gpminthiscase,forthecalculation ofpeakRHRpressure.

TABLE6SEQUENCEOFEVENTS-MASSADDITIONCASEWITHTHREECHARGINGPUMPS,85'FPRIMARYTEMPERATURE EVENT3CharinumsstartedCharinumsreachfullflowPeakpressureof480.2psiareache'dinthebottomofthereactorvesselPeakpressureof470.3psiareachedinthehotleconnection toRHRTIMEINSECONDS0.01.0534.0534.06.1.2Case2Case2isamassadditioncasewiththeprimarypressureat329.7psiaandwithaprimarytemperature of60'F.OneRCpumpisrunningatsteady-state inthistransient.

Thereis3gpmRCpumpsealreturnflow.'hetransient isinitiated withstartingofonechargingpump.Nopressurizer ventisopenandnoSIpumpisstarted.Thiscasealsohasthesecondary systemdisconnected fromtheprimaryinthemodelasinallmassadditioncases.NoRHRsystemismodeled.Withthestartingofonechargingpump,theprimarysystempressurizes rapidlyandthePORVsopentorelievethepressure.

Thereactorvesselreachesapeakpressureof554.42psia.Theallowable pressureatthistemperature is608.7psia.ThepeakpressureintheRHRsystemiscalculated byadding138.03psil9

FTINon-Proprietary 86-123482043tothehighestpressurereachedinthehotlegconnection oftheRHRsystem.Thisvalueisbasedonatotalof2000gpmRHRflowrate.ThepeakRHRsystempressurethuscalculated is656psiaascomparedwiththestructural allowable peakpressureof674.70psia.Figures687showthepressureinthereactorvessel,andthepressureinthehotlegRHRconnection point,respectively.

ThiscasepassestheAppendixGlimit(CodeCaseN-514)andtheRHRsystem'asmargintotheacceptance limit.ThesequenceofeventsisshowninTable7.TABLE7SEQUENCEOFEVENTS-MASSADDITIONCASEWITHONECHARGINGPUMP,60'FPRIMARYTEMPERATURE EVENTOnecharinumstartedCharinumreachesfullflowPeakpressureof517.97psiareachedatRHRsuctionointPeakpressureof.siareachede+.'inreactorvesse'wncomerTIME,SECS0.01.019.119.16.1.3Case3Case3isamassadditioncasewiththeprimarypressureandtemperature at14.7psiaand60'Frespectively.

NoRCpumpisrunninginthistransient.

Thetransient isinitiated bystartingoneSlpump.Apressurizer ventof1.1squareinchesisopen.Theprimaryandsecondary systemsareointhermalequilibrium.

NoRHRsystemismodeled.Instead,thepressuredifference betweentheRHRpumpdischarge andtheRHRsysteminletwasaddedtoobtainthecalculated results.WiththestartingofoneSlpump,theprimarysystempressurizes.

Theprimarypressurereachesasteady-state pressureatalevelwheretheSIflowandtheflowthroughtheventareequal.ThePORVsdonothavetoopentorelievethepressure.

ThePORVsarenotcreditedintheanalysis.

Thereactorvesselreachesapeakpressureof413.48psia.Theallowable pressureatthistemperature is608.7psia.ThepeakpressureintheRHRsysteiTriscalculated byadding138.03psitothehighestpressurereachedinthehotlegconnection oftheRHRsystem.Thisvalueisbasedonatotalof2000gpmRHRflowrate.ThepeakRHRsystempressurethuscalculated is542.34psiaascomparedwiththestructural allowable peakpressureof674.70psia.20 FTINon-Proprietary 86-1234820-03 Figures889showthepressureinthereactorvesselandthehotlegRHRconnection point,respectively.

ThiscasepassestheAppendixG(CodeCaseN-514)limitforacceptance withasizeablemargin.TheRHRsystemhasmargintoacceptance limit.ThesequenceofeventsisshowninTable8.TABLE8SEQUENCEOFEVENTS-MASSADDITIONCASEWITH1.1SQ.INCHVENTANDONESlPUMPINJECTION, PRIMARYTEMP.60'FEVENTOnesafetin'ection umstartedSafeinectionumreachesfullffowPeakpressureof404.93psiareachedatRHRinletPeakpressureof.$siareachedl348inreactorvesselTIME,SEC0.01.0166.00175.006.1.4Case4Case4isamassadditioncasewiththeprimarypressureat14.7psiaandwithaprimarytemperature of212'F.NoRCpumpisrunninginthistransient.

Thetransient isinitiated bystartingoneSlpump.Apressurizer ventof1.1squareinchesareaisopen.Thiscasealsohasthesecondary systemdisconnected fromtheprimaryinthemodel.NoRHRsystemismodeled.Sincetheprimarysystemisatatmospheric pressureatthetopofthepressurizer, thesteamgenerator top-mostregioninsidethetubeswillexperience pressures lowerthanatmosphere andhence,steambubblescanforminthisregionat212'F.Steamvoidsinthesystemcouldyieldnon-conservative resultsbyincreasing thecompressibility ofthereactorcoolant.Topreventvoidformation, thesteamgenerator wasinitialized separatefromtheprimarysystemandatatemperature belowthesaturation temperature.

Thetransient isinitiated byconnecting thesteamgenerators totheRCSandbystartinganSlpump.WiththestartingofoneSIpump,theprimarysystempressurizes untiltheflowoutoftheventbalancestheflowfromtheSlpump.ThepeakpressurereachedisbelowthePORVsetpoint.

ThePORVsarenotcreditedinthiscase.Thereactorvesselreachesapeakpressureof396.72psia.Theallowable pressureatthistemperature isapproximately 780.3psia.ThepeakpressureintheRHRsystemiscalculated byadding138.03psitothehighestpressurereachedinthehotlegconnection oftheRHRsystem.Thisvalueisbasedona21

FTlNon-Proprietary 86-123482043totalof2000gpmRHRflowrate.ThepeakRHRsystempressurethuscalculated is525.91psiaascomparedwiththestructural allowable peakpressureof674.70psia.Figures10&11showthepressureinthereactorvessel,andthepressureinthehotlegRHRconnection point,respectively.

ThepeakreactorvesselpressureislessthantheAppendixGlimit(CodeCaseN-514)andtheRHRsystemhasmargintotheacceptance limit.ThesequenceofeventsisshowninTable9.TABLE9MASSADDITIONCASE-VENTOF1.1SQ.INCHES AREAOPEN,ONESlPUMPSTART,PRIMARYTEMPERATURE 212'FEVENTOnesafein'ection umstartedSafeinectionumreachesfullflowPeakpressureof387.88psiareachedatRHRsstemsuctionointPeakpressureof.siareachedinreactIvssel.TIME,SECS0.01.0200.0200.06.1.5Case2aCase2aisamassadditioncasewiththeprimarypressureat329.7psiaandwithaprimarytemperature of60'F.TwoRCpumpsarerunningatsteady-state inthistransient.

ThereisnoRCpumpsealreturnflowmodeled.

Thetransient isinitiated bystartingthreechargingpumps.Nopressurizer ventisopenandnoSlpumpisstarted.NoRHRsystemismodeled.Withthestartingofthreechargingpumps,theprimarysystempressurizes andthePORVsopentorelievethepressure.

Thereactorvesselreachesapeakpressureof587.44psia.TheAppendixG(CodeCaseN-514)allowable pressureatthistemperature is608.7psia.ThepeakpressureintheRHRsystemiscalculated byadding138.03psitothehighestpressurereachedinthehotlegconnection oftheRHRsystem.Thisvalueisbasedonatotalof2000gpmRHRfiowrate.ThepeakRHRsystempressurethuscalculated is663.49psiaascomparedwiththestructural allowable peakpressureof674.70psia.Figures57&58showthepressureinthereactorvessel,andthepressureinthehotlegRHRconnection point,respectively.

'

FTINon-Proprietary 86-1234820-03 ThepeakreactorvesselpressureislessthantheAppendixGlimitandtheRHRsystemalsohasmargintotheacceptance limit.ThesequenceofeventsisshowninTable7a.TABLE9aSEQUENCEOFEVENTS-MASSADDITIONCASEWITHTHREECHARGINGPUMPS,60'FPRIMARYTEMPERATURE EVENTThreecharinumsstartedCharinumsreachefullflowPeakpressureof525.46psiareachedatRHRsuctionointPeakpressureof587.44psiareachedinreactorvesseldowncomer TIME,SECS0.01.07.457.456.2HeatAdditionCases6.2.1Case5Case5isaheatadditioncasewiththeprimarysysteminitialized to60'Fand329.7psia.Thesecondary systemisatatemperature 50'Fhigherthanthe'rimary system.TheRHRsystemisrunningatacapacityof2000gpmtotal.TheRHRsystemismodeledexplicitly fortheheatadditioncases.Nopressurizer ventorsealreturnflowismodeled.Thetransient isinitiated bystartingthereactorcoolantpumpintheloopinwhichthepressurizer isattached.

Thereactorcoolantpumpforcesflowthroughtheloops,thusallowingthesecondary sidetoheattheprimaryside.Thisresultsinanexpansion oftheprimarysystemfluid.Sincethepressurizer iswater-solid, thepressurerisesuntilthePORVopenstorelievethepressure.

ThiscaseisrununtilthePORVcyclesafewtimestoassurethatthepeakpressureisdeclining witheverycycle.Thepeakpressurereachedinthereactorvessel,is551.26psia.Theallowable pressureforthistemperature is608.7psia.Hence,thiscasepassestheAppendixG(CodeCaseN-514)limit.ThepeakRHRsystempressurereachedinthiscaseis650.05psia.Theallowable valueforthissystemis674.70psia.Hence,theRHRsystemalsopassesthepressureacceptance criterion.

FTINon-Proprietary 86-1234820-03 Figures12through20showthereactorvesselpressure, RHRsystempressure, theprimarysystemtemperatures inthetwoloops,flowratesinthetwoloops,thesecondary systemtemperatures inthetwoloops,andthePORVflowrate.Table10showsthesequenceofeventsforthiscase.TABLE10HEATADDITIONCASE-PRIMARY TEMPERATURE 60'F,2000GPMRHR,ONERCPUMPSTARTEDEVENTOneRCumstartedRCumreachesfullflowPORVoensforthefirst.timePeakpressureof551.26psiareachedinthereactorvesselPeakpressureof650.05psiareachedintheRHRsstemTIME,SECS0.017.446.0046.0046.006.2.2Case6Case6isaheatadditioncasewiththeprimarysysteminitialized to85'Fand329.7psia.Thesecondary systemisatatemperature 50'Fhigherthantheprimarysystem.TheRHRsystemisrunningatacapacityof2000gpmtotal.TheRHRsystemismodeledexplicitly fortheheatadditioncases.Nopressurizer ventorsealleakageismodeled.Thetransient isinitiated bystartingthereactorcoolantpumpintheloopinwhichthepressurizer isattached.

Thereactorcoolantpumpforcesflowthroughtheloops,thusallowingthesecondary sidetoheattheprimaryside.Thisresultsinanexpansion oftheprimarysystemfluid.Sincethepressurizer iswater-solid, thepressurerisesuntilthePORVopenstorelievethepressure.

ThiscaseisrununtilthePORVcyclesafewtimestoassurethatthepeakpressureisdeclining witheverycycle.I'hepeakpressurereachedinthereactorvesselis558.04psia.TheAppendixG(CodeCaseN-514)allowable forthistemperature is618.6psia.Hence,thiscasepassestheAppendixGlimit.ThepeakRHRsystempressurereachedinthiscaseis656.34psia.Theallowable valueforthissystemis674.70psia.Hence,theRHRsystemalsopassesthepressureacceptance criterion.

Figures21through29showthereactorvesselpressure, RHRsystempressure, theprimarysystemtemperatures inthetwoloops,flowratesinthetwoloops,24

FTINon-Proprietary 86-12348204I3 andthesecondary systemtemperatures inthetwoloops.Table11showsthesequenceofeventsforthiscase.TABLE11HEATADDITIONCASE-PRIMARYTEMPERATURE 85'F,2000GPMRHR,ONERCPUMPSTARTEDEVENTOneRCumstartedRCumreachesfullflowPORVoensforthefirsttimePeakpressureof558.04psiareachedinthereactorvesselPeakpressureof656.34psiareachedintheRHRsstemTIME,SECS0.017.422.522.522.56.2.3Case7Case7isaheatadditioncasewiththeprimarysysteminitialized at280'Fand329.7psia.Thesecondary systemisatatemperature 50'Fhigherthantheprimarysystem.TheRHRsystemisrunningatacapacityof2000gpmtotal.TheRHRsystemismodeledexplicitly fortheheatadditioncases.Nopressurizer ventorsealleakageismodeled.Thetransient isinitiated bystartingthereactorcoolantpumpintheloopinwhichthepressurizer isattached.

Thereactorcoolantpumpforcesflowthroughtheloops,thusallowingthesecondary sidetoheatuptheprimaryside.Thisresultsinanexpansion oftheprimarysystemfluid.Sincethepressurizer iswater-solid, thepressurerisesuntilthePORVopenstorelievethepressure.

ThiscaseisrununtilthePORVcyclesafewtimestoassurethatthepeakpressureisdeclining witheverycycle.Thepeakpressurereachedinthereactorvesselis569.33psia.Theallowable pressureforthistemperature is1116.9psia.Hence,thiscasepassestheAppendixG(CodeCaseN-514)limit.ThepeakRHRsystempressurereachedinthiscaseis663.66psia.Theallowable valueforthissystemis674.70psia.Hence,theRHRsystemalsopassesthepressureacceptance criterion.

Figures30through38showthereactorvesselpressure, RHRsystempressure, theprimarysystemtemperatures inthetwoloops,flowratesinthetwoloops,thesecondary systemtemperatures inthetwoloopsandthePORVflowrate.Table12showsthesequenceofeventsforthiscase.25

'A FTINon-Proprietary 86-123482043TABLE12HEATADDITIONCASE-PRIMARY TEMPERATURE 280'F,2000GPMRHRFLOW,ONERCPUMPSTARTEDEVENTOneRVumstartedPORVoensforthefirsttimeRCumreachesfullflowPeakpressureof663.66psiareachedintheRHRsstemPeakpressureof569.33psiareachedinthereactorvesselTIME,SECS0.010.017.446.0046.006.2.4Case8Case8isaheatadditioncasewiththeprimarysysteminitialized to85'Fand329.7psia.Thesecondary systemisatatemperature 50'Fhigherthantheprimarysystem.TheRHRsystemisrunningatacapacityof1700gpmtotal.TheRHRsystemismodeledexplicitly fortheheatadditioncases.Nopressurizer ventorsealreturnismodeled.Thetransient isinitiated bystartingthereactorcoolantpumpintheloopinwhichthepressurizer isattached.

Thereactorcoolantpumpforcesflowthroughtheloops,thusallowingthesecondary sidetoheattheprimaryside.Thisresultsinanexpansion oftheprimarysystemfluid.Sincethepressurizer iswater-solid, thepressurerisesuntilthePORVopenstorelievethepressure.

ThiscaseisrununtilthePORVcyclesafewtimestoassurethatthepeakpressureisdeclining witheverycycle.Thepeakpressurereachedinthereactorvesselis546.79psia.TheAppendixG(CodeCaseN-514)allowable forthistemperature is618.6psia.Hence,thiscasepassestheAppendixGlimit.ThepeakRHRsystempressurereachedinthiscaseis640.78psia.Theallowable valueforthissystemis674.70psia.Hence,theRHRsystemalsopassesthepressureacceptance criterion.

Figures39through47showthereactorvesselpressure, RHRsystempressure, theprimarysystemtemperatures inthetwoloops,flowratesinthetwoloops,thesecondary systemtemperatures inthetwoloopsandthePORVflowrate.Table13showsthesequenceofeventsforthiscase.26 e

FTINon-Proprietary 86-123482043 TABLE13HEATADDITIONCASE-PRIMARYTEMPERATURE 86'F,RHRFLOWAT1700GPM,ONERCPUMPSTARTEDEVENTOneRCumstartedRCumreachesfullflowPORVoensfirsttimePeakRVressureof546.79siareachedPeakRHRpressureof640.78psiareachedTIME,SECS0.017.423.223.223.26.2.5Case9Case9isaheatadditioncasewiththeprimarysysteminitialized to320'Fand329.7psia.Thesecondary systemisatatemperature 50'Fhigherthantheprimarysystem.TheRHRsystemisrunningatacapacityof1700gpmtotal~TheRHRsystemismodeledexplicitly fortheheatadditioncases.Nopressurizer ventorsealleakageismodeled.Thetransient isinitiated bystartingthereactorcoolantpumpintheloopinwhichthepressurizer isattached.

Thereactorcoolantpumpforcesflowthroughtheloops,thusallowingthesecondary sidetoheattheprimaryside.Thisresultsinanexpansion oftheprimarysystemfluid.Sincethepressurizer iswater-solid, thepressurerisesuntilthePORVopenstorelievethepressure.

ThiscaseisrununtilthePORVcyclesafewtimestoassurethatthepeakpressureisdeclining witheverycycle.EThepeakpressurereachedinthereactorvesselis563.83psia.Theallowable pressureforthistemperature is15294psia.Hence,thiscasepassestheAppendixG(CodeCaseN-514)limit.ThepeakRHRsystempressurereachedinthiscaseis655.66psia.Theallowable valueforthissystemis674.70psia.Hence,theRHRsystemalsopassesthepressureacceptance criterion.

Figures48through56showthereactorvesselpressure, RHRsystempressure, theprimarysystemtemperatures inthetwoloops,flowratesinthetwoloops,thesecondary systemtemperatures inthetwoloopsandthePORVflowrate.Table14showsthesequenceofeventsforthiscase.27 FTlNon-Proprietary 86-123482043TA8LE14HEATADDITIONCASE-PRIMARYTEMPERATURE 320'F,RHR 1700GPMFLOWRATE,ONERCPUMPSTARTEDEVENTOneRCumstartedPORVoensfirsttimeRCumreachesfullflowPeakpressureinRHRsystemof655.66siareachedPeakpressureof563.82psiareachedintheRVTIME,SECS0.08.8117.410.521.37.0SUMMARYANDCONCLUSIONS Framatome Technologies Incorporated (FTI)updatedtheanalysisofthelowtemperature overpressure eventsfortheRochester GasandElectric(RGE)RobertE.GinnaNuclearPowerStation.ThisanalysisbecomesthenewanalysisofrecordforRGE.Inthiseffort,aspectrumofLTOPeventstoboundallpossibleoperational configurations wasanalyzedandtheresultscomparedtotheacceptance criteriaoftheAppendixGlimitsforembrittlement andtheRHRoverpressure structural designlimit.Themostlimitingmassadditioncaseanalyzedisacasewiththreechargingpumpsturnedonwhentheprimarysystemisat60'FwithtwoRCpumpsrunning.Thisresultedinapeakpressureinthereactorvesselof587.44psia,whichislowerthantheAppendixG(CodeCaseN-514)limitatthistemperature.

ThepeakpressureintheRHRsysteminthiscasewith2000gpmofRHRflow(i.e.twoRHRpumpsrunning)is663.5psia.TheRHRsystempassesthestructural acceptance criterion setfortheRHRsystembyamarginof11.2psi.Themostlimitingheatadditioncaseisthestartofareactorcoolantpumpwiththeprimarysystemat60'F.Thepeakreactorvesselpressurereachedintljytransient was551.25psia.TheAppendixG(CodeCaseN-514)limitis608g7psia.Hence,thiscasepasseswithamarginof57.@$si.ThepeakpressureattheRHRpumpdischarge forthiscasewas649.96psiaascomparedwithanacceptance limitof674.7psia.ThemarginintheRHRsystemis24.74psi.FortheRHRsystem,thelimitingeventisareactorcoolantpumpstartwithboththeRHRpumpsrunningandtheprimaryinitialtemperature at280'F.Inthiscase,thepeakRHRpressurereachedis663.66psiaascomparedwithanallowable of674.70psia.Above280'Fprimarytemperature, onlyoneRHRpumpwillberunning,yieldingagreatermargintothepressurelimit.

FTINon-Proprietary 86-123482043 Whentheplantisinaconfiguration inwhichthepressurizer vent(1.1sq.inches) isopen,theprimarysystempressurewillbeatatmospheric pressureinthepressurizer.

NoRCpumpwillbeallowedtorununderventedconditions sinceNPSHwillnotbeavailable torunanypump.Themostlimitingmassadditionforthisplantcondition isthestartofanSlpumpwhentheinitialprimarytemperature isat60'F.Thiscasehasypegreactor vesselpressureof~'$sia,whichislessthantheAppendixGfimiFby, psi.ThepeakRHRressureinthiscaseis."siaascomparedwi'ieallowable presssure of674.70psia.Conseq6ent, thiscaseboundedbystartofachargingpumpat60'Fwiththepressurizer ventclosedandPORVoperable.

ThesummaryofresultsofallLTOPcasesisshowninTable15.

INon-Proprietary 23482043TABLE15SUMMARYOFRESULTSRESULTSOFTHEMASSADDITIONCASESCaseIDDescription Peakpressureinreactorvessel,psia Allowable perAppendixG,CodeCase'-514 inpsiaMargininpsiPeakpress.Structural inRHRallowable systeminpsiainpsiaMargininpsiCase185F,threechargingpumpsstarted,noRCpumprunning,primarypressure329.7psiaNoRCpumpsealreturnflow1700gpmRHR480.19618.6138.41598.43674.7076.27Case260'F,onechargingpumpstarted,oneRCpumprunning,primarypressure329.7psia3gpmRCpumpsealreturnflow=2000gpmRHR554.42608.754.28656.08674.7018.62(continued) 30 iNon-Proprietary 23482043TABLE15(continued)

RESULTSOFTHEMASSADDITIONCASESAllowable perAppendixG,CodeCaseN-514inpsiaCaseIDDescription PeakpressureMargininreactorinpsivessel,psia

.Peakpress.Structural inRHRallowable systeminpsiainpsiaMarginlnpslCase360'F,14.7psiaprimarypressure1.1sq.inchventopen,oneSlpumpon,noRCpumpson.I2000gpmRHR413.48608.7195.22542.34674.70132.36Case4212'Fprimary,no RCpumps,14.7psiainitialprimarypressure, oneSlpumpturnedon.I2000gpmRHR398.72-=780.3383.58525.91674.70148.79Case2a60'Fprimary,twoRCpumps,329.7psiainitialpressurethreechargingpumpsturnedon.)2000gpmRHR587.44608.721.26663.49-674.7011.21Note:TheRHRpeakpressureiscalculated byaddingtothepeakpressureathotlegavalueof138.03psi,whichisthepressuredropbetweennode100andnode455inthe85'Fheatadditioncase,Case6.(continued)

TlNon-Proprietary 234820-03 TABLE15(continued)

RESULTSOFHEATADDITIONCASESCaseIDDescription PeakpressureAllowable perMargininreactorAppendixGinpsivessel,psia inpsia=-Peakpress.Structural MargininRHRallowable inpsisysteminpsiainpsia608.7Case560'Fprimary,2000gpmRHR,oneRCpumpstarted.Primarypressure329.7psia551.2557.45649.96674.7024.74Case685'Fprimary,2000 gpmRHR,oneRCpumpstarted.Primarypressure329.7psia558.04618.6Case7280'Fprimary,2000gpmRHR,oneRCpumpstartedPrimarypressure329.7psia569.331116.960.56656.34674.7018.36,547.57663.66674.7011.04Case885'Fprimary,1700gpmRHR,oneRCpumpstartedPrimarypressure329.7psia546.79618.671.81640.78674.7033.9232 INon-Proprietary 234820-03 TABLE15(continued)

RESULTSOFHEATADDITIONCASESCaseIDDescription PeakpressureAllowable perinreactor.AppendixGvessel,psia inpsiaMargininpsiPeakpress.Structural inRHRallowable systeminpsiainpsiaMargininpsiCase9320.0'Fprimary,1700gpmRHR,oneRCpumpstartedPrimarypressure329.7psia563.821529.4965.58655.66674.7019.04Note:AppendixGallowables shownherearefromTable2.Reference 4hadanearlierAppendixGcurvefromtheUFSARofGinnaplanta'ndthevalueswereslightlydifferent..

32a

FTINon-Proprietary 86-1234820-03

8.0REFERENCES

1.U.S.Nuclear Regulatory Commission Regulatory Guide1.99,"Embrittlement ofReactorVesselMaterials",

Revision2,May1988.,2.WCAP-14684, "R.E.Ginna HeatupandCooldownLimitCurvesforNormalOperation,"

June1996.3."NUREG/CR-5194 EGG-2531R4,"RELAP5/MOD2 ModelsandCorrelations",

August1988.4.FTIDocument32-1232650-00, "LowTemperature Overpressure AnalysisforRGE-GinnaPlant"February1995.5.BAW-10164P-A, "RELAP5/MOD2-B&W-AnAdvancedComputerProgramforLightWaterReactorLOCAandNon-LOCATransient Analysis,"

CodeTopicalReport,Revision3,July1996.6.FTIDoc.32-1266167-00, "Additional LTOPHeatAdditionCases",June1997.7.FTIDoc.32-1266168-00, "GinnaLTOPMass.Add.",

June1997.32b FTINon-Proprietary 86-123482043 PLOTSOFTHERESULTSI33 FIGURE4CASE1MASSADDITIONCASEPRIMARYTEMPERATURE 85'FPRIMARYPRESSURE329.7PSIA3CHARGING PUMPSNORCPUMPRUNNINGNOSEALLEAKAGE4S0--C4O0nZ,'0UCO400350300-200080160240320TIMEINSECONDS480jIIII 450FIGURE5CASE1MASSADDITIONCASEPRIMARYTEMPERATURE 85'FPRIMARYPRESSURE329.7PSIA3CHARGINGPUMPSNORCPUMPRUNNINGNOSEALLEAKAGEllOOQP9000350"-300-200<<0$00--------25160240320TIMEINSECONDS48000tfVPoCDtCD FIGURE6MASSADDITIONCASEPRIMARYTEMPERATURF 60'FPRIMARYPRESSURE329.7PSIA1CHARGINGPUMPONERCPUMPRUNNING3GPMSEALLEAKAGE5605204804404003603200102030a54050TIMEINSECONDS6020Tl0O0ICOPJC)1C)

PGU~IzOO332328324320316312FIGURE36CASE7HEATADDITIONCASEPRIMARYTEMPERATURE 280'FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED2000GPMRHRr1ODUOuCO30S10203050Transient timeinsecs 33232$FIGURE37CASE7HEATADDITIONCASEPRIMARYTEMPERATURE 280'FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED'000GPMRHRrl0Oa324320316-312-30S0IO203050Transient timeinsecs 150FIGURE38CASE7HEATADDITIONCASEPRIMARYTEMPERATURE 280'FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED2000GPMRHR11O0U(D9)~I100OtelU750so10203050Transient timeinsecs 00z560520480440400360FIGURE39CASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85oFPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHR'Tl0OU(DGl320010152025TIMEINSECONDS3035 680640FIGUCASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85'FPRIMARYPRESSURE329.7PS)ANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRllzO0U(DGl6ooOc8560.g520C44SO440101520TIMEINSECONDS253035CoIPUCOPvtDICD44 xl02016FIGURE41CASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85oFPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRllODOOCDDl12S40101520TIMEINSECONDS303540CDIfuCDIC)V4 FIGURECASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85oPPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRnODOU(DCA~1C4-800000-1200R>-It'00-20M-24001020TIMEINSECONDS.3035 110FIGURE43CASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85oPPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRA0OOg10510095908S80010IS20TIMEINSECONDS303S 140FIGURE44CASE8<EATADDITIONCASE'PRIMARYTEMPERATURE 85'FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHR130~I00gl20OIIO1000II-8001020TIMEINSECONDS303540 136FIGURE45CASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85oFPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRA.9C48EICQQOOCQ13212S124.1201161121015203540TIMEINSECONDS e

FIGURCASE8HEATADDITIONCASEPRIMARYTEMPERATURF 85'FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRbQaOC4O8A8C48COaOOCQ140136132128124120116101520TIMEINSECONDS303$llOOUCDCD00I00C)IC)

120FIGURCASE8HEATADDITIONCASEPRIMARYTEMPERATURE 85'FPRIMARYPRESSURE329.7PSIANOVENT;NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRIIIlll"rlOOa0(DfD80604020101520TIMEINSECONDS253035

~\5500500OO450~4MgQ350FIG48CASE9HEATADDITIONCASEPRIMARYTEMPERATURE 320'FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED'I1700GPMRHRn00OCD30001020TIMEINSECONDS303540 00 FIGUCASE9HEATADDITIONCASEPRIMARYTEMPERATURE 320FPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRTl00O(0fDO600C4Sso.9soo450lo20TIMEINSECONDS303$

350FIGURE50CASE9HEATADDITIONCASEPRIMARYTEMPERATURE 320OPPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARG1NGPUMPONERCPUMPSTARTED1700GPMRHRQA00UO345340335330325320IO20TIMEINSECONDS3S40 RE51CASE9HEATADDITIONCASEPRIMARYTEMPERATURF 32QoFPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRQ0DRO368360.3523443363283200101520TIMEINSECONDS303540rl'zO0UCDCOfVCOPvCOIC) x10016FIG2CASE9HEATADDITIONCASEPRIMARYTEMPERATURE 320oFPRIMARYPRESSURE32S.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRInO0UCDfD128401020TIMEINSECONDS30401COPuCDICD FIG53CASE9HEATADDITIONCASEPRIMARYTEMPERATURE 320oFPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHR400Pll4-80000Q-1200>~-iae-2000-24001020TIMEINSECONDS3035 37$FIGURE54-CASE9HEATADDITIONCASEPRIMARYTEMPERATURE 32POFPRIMARYPRESSURE329.7PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRDDAA~gC48%4EJGgaOCJCII370365360355350101520TIMEINSECONDS3040 FIGURE55CASE9HEATADDITIONCASEPRIMARYTEMPERATURE 320'FPRIMARYPRESSURE329.?PSIANOVENT,NOSI,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRbO<0'Of4OOc4~I8.884O37236$36436035635234S10l520TIMEINSECONDS30TlOO0CDCOifV44CObdC)lC)i@4 150FIGURECASE9HEATADDITIONCASEPRIMARYTEMPERATURE 3200FPRIMARYPRESSURE3297PSIANOVENT,NOSl,NOCHARGINGPUMPONERCPUMPSTARTED1700GPMRHRn000U100050101520TIMEINSECONDS253035 FIGURE57CASE2aMASSADDITIONCASEPRIMARYTEMPERATURE 60'FPRIMARYPRESSURE329.7PSIA3CHARGING PUMPSTWORCPUMPRUNNING550500450400350Ilj300010203040TIMEINSECONDS50607080 I00Ki550500450400350FIGURE58CASE2aMASSADDITIONCASEPRIMARYTEMPERATURF 6QPPRIMARYPRESSURE329.7PSIA3CHARGING PUMPSTWORCPUMPRUNNING!6.~nOO'UCDGl250010203040TIMEINSECONDS50607080 Attachment VIIIWCAP-14684 (FirstuseofP/Tlimitmethodology, NochangefromthatprovidedinApril24,1997RG&ElettertoNRC.)