ML17324B003

Rev 0 to Books 1-3 of Analysis of Pressurizer Safety/Relief Valves Discharge Piping Sys Per NUREG-0737,II.D.1,Unit 1.

ML17324B003
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Site:	Cook
Issue date:	06/06/1983
From:	TELEDYNE ENGINEERING SERVICES
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ML17324B004	List: ML17324B003 ML17324B005 ML17334A990
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM TR-5364-1, TR-5364-1-R, TR-5364-1-R00, NUDOCS 8608060052
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8608060052 860730PDRADOCK05000315PPDRL\i'~~,1TECHNICAL REPORTTR-5364-1 REVISION0BOOK1OF15DONALDC.COOKNUCLEARGENERATING PLANTANALYSISOPPRESSURIZER SAPBTY/RELKF VALVESDISCHARGE PIPINGSYSTEMPERNUREG073V,ILD.I,UNTFIJUNE6,1983 l'i'iF AMERICANELECTRICPOWERSERVICECORPORATION 2BROAOWAYNEWYORK,NEWYORK10004TECHNICAL REPORTTR-5364-1 REVISION0BOOK1OF15DONALDC.COOKNUCI.EARGENERATING STATIONANALYSISOFPRESSURIZER SAFETY/RELIEF VALVESDISCHARGE PIPINGSYSTEMPERNUREG0737,II~0.1,UNIT1JUNE6,1983N'TELEDYNE ENGINEERING SERVICES130SECONDAVENUEWALTHAM,MASSACHUSETTS 02254617-890-3350 4('I~~'I,1(%hICtt,C\r,~~fII0I1C:'Ij1A~r Technical ReportTR-5364-1 Revision0TABLEOFCONTENTSATELEDYNEENGINEERINQ SERVICESPAGE

2.0CONCLUSION

S 3.0SYSTEMDESCRIPTION/DISCUSSION 4.0THERMALFLUIDSANALYSIS4.1Introduction 4.2RELAPModel4.2.1Pressurizer Conditions 4.2.2ValveModeling4.2.3Discharge Piping4.2.4quenchTank4.3RELAPModelControlVolumes4.4quarterModel4.5Unit1PORVModel4.5.1Condensate ModeledCase4.5.2,PORVModeledTransient 4.6ValveFlowRateCalculation 4.6.1SVFlowRate4.6.2PORVFlowRate4.7RELAPPlotsBook1of152-13-14-14-1434-34-44-54-54-164-264-'364-364-364-404-414-.424-454.7.1Unit1-Condensate/Steam Case4.7.2Unit1-400oSolidLiquidCase4.7.3quarterModel-ColdLoopSeal/Steam Case4464-1664-2444.8ForceTimeHistoryPlotsBook2of154-2604.8.1Unit1-Condensate/Steam Case4.8.2Unit1-400oSolidLiquidCase4.8.3quarterModel-ColdLoopSeal/Steam Case4.9RELAPInput4-2614-3204-3924-4204.9.14.9.24.9.34.9.44.9.5PORVCondensate/Steam Condensate/Steam RestartPORVSolid400oLiquidPORVSolid400oLiquidRestartSVColdLoopSeal(quarterModel)4-4214-4394-4484-4674-472 ga'\pl4Aft/C~ia<ajh~ra-pEWI'*r"0P~(tis/.Ag,J Technica1ReportTR-5364-1 Revision04.10REPIPEInputTABLEOFCONTENTSContinued

)iTELEDYNEENQINEERINQ SERVICESPAGE4-4784.10.1Unit1-ModelSectionA4.10.2Unit1-ModelSectionB4.10.3Unit2-(quarterModel)4.11APPENDIXA5.0STRUCTURAL ANALYSIS5.1Deadweight Analysis5.2ThermalAnalysis5.3SeismicAnalysis5.4Force/Time HistoryAnalysis5.4.1PORVTransient 5.4.2SVTransient

6.0 ANALYTICAL

RESULTS6.1StressSu@naryBook3of154-479'-4894-4965-15-25-25-25-75-75-86-16-16.1.16.1.26.1.36.1.46.1.56.1.6EquationA-1StressesEquationA-2StressesEquationB-1StressesEquationB-2StressesEquationB-3StressesEquationC-1Stresses6-66-176-286-396-506-616.2SupportLoads6.3ValveAccelerations 6.3.1DBESeismicValveAccelerations 6.3.2PORVTransient ShockValveAccelerations 6.4NozzleLoads6.5ValveLoads6.6Miscellaneous Calculations 6.6.1ThermalBoundaryDisplacements6.6.2OBESpectra6.6.3DBESpectra7.0DRAWINGS

8.0REFERENCES

6-726-1056-1066-1106-1146-1206-1266-1276-1336-1407-18-1 ifqfINC4'L Technical ReportTR-5364-1 Revision0ATELEDYNEENGlNEERINQ SERV(CESTABLEOFCONTENTSContinued 9.0COMPUTERANALYSIS9.19.29.39.49.59.69.7RELAP/REP IPEInputDeadweight/Thermal Input/Output OBESeismicX-YInput/Output OBESeismicY-ZInput/Output DBESeismicX-YInput/Output DBESeismicY-ZInput/Output PORVTransient ShockInputBook4of15Book5of15Books6,7of15Books8,9of15Books10,11of15Books12,13of15Books14,15of15

~I1I"llICI~I!

Technical ReportTR-5364-1 Revision0-A-TELEDYNE ENQlNEERING SERVfCES1.0.INTRODUCTION AmericanElectricPowerServiceCorporation

{AEP),purchaseordernumber02676-820-1N, authorized TeledyneEngineering Services(TES)toanalyzethePressurizer Safety/Relief ValveDischarge PipingperNRCNUREG-0737, ItemII.D.1,fortheDonaldC.CookNuclearPowerPlant,UnitPl.Thisactivitywasperformed inaccordance withtheTES(}ualityAssurance programwhichmeetstherequirements of10CFR50,AppendixB,andANSIN45.2.11asinterpreted byRegulatory Guide1.64,Revision2.Thescopeofworkforthiseffortisdescribed indetailinTeledyneEngineering ServicesTechnical ProposalPR-5653{Reference 1),datedMay4,1981andmodifiedasstatedinAEPletterdatedNovember29,1982,fromMr.SamUlan(AEP)to,Mr.L.B.Semprucci (TES)andinAEPletterfromMr.SamUlan(AEP)toMr.P.D.Harrison(TES)datedMarch15,1983(References 2and3).Themajorityoftheanalysiswasperformed afterthereceiptofAEPlettersdatedNovember29,1982andMarch15,1983(References 2and3),whichwereissuedaftermorecompleteinformation wasavailable from,theEPRIdata.Thisanalysiswasperformed usinglargedigitalcomputerprogramssupplemented withanynecessary handcalculations.

TheRELAP5MOD1Cycle14computerprogramwasusedtodothethermalfluidtransient analysis.

Thestructural

analysis, forallloadingconditions, wasdoneutilizing theTMRSAPcomputerprogram.'hesizeofthepressurizersafety/relief valvedischarge pipingsystemwassolargethatthecomputermodels,forbothRELAPandTMRSAP,strainedthelimitsoftheprograms.

Thiscondition necessitated multipleRELAPrunsinordertoexecutethethermalfluidtransient analysisfortheappropriate lengthoftime.Forthestructural analysisitwasnecessary toexpandthecoreoftheTMRSAPprograminordertoavoidanoverconservative overlapanalysis.

III'gItj"I,rit)Q'4~~a'El, TechnicalReportTR-5364-1 Revision02-1r>TELEDYNEENGINEERINQ SERVICES

2.0CONCLUSION

S Theanalysisperformed byTESonthePressurizerSafety/ReliefValveDischarge PipingSystemindicates thatallcriteriaofNRCNUREG-0737, ItemII.D.1ismetfornormalandupset(PORVdischarge) conditions andisnotmetfortheemergency (SVdischarge) condition.

Evaluation ofnormalandupsetconditions requiredstructural analysisfordeadweight, thermal,OBEseismic,andPORVtransient shockloadingconditions.

Detailsofthevariousloadingsconsidered areprovidedinSection5.Basedonpreliminary SVthermalhydrodynamic transient

analysis, excessive loadsandstresseswereanticipated and,therefore, itwasdecided;foreconomicreasons,thataquartermodelSVthermaltransientanalysis(RELAP5)shouldbeperformed tochecktheadequacyofthesystemfortheemergency condition.

Inaddition, duetothesimilarities oftheUnit1andUnit2geometries, itwasdetermined thattheresultsofoneunitcouldbeconsidered applicable totheotherunit.Thequartermodelconsisted ofthepipingfromthepressurizer, throughvalveSV-45C,andcontinuing downtothequenchtank,forUnit2.TheSVtransient analysisconsidered onlytheeffectofvalveSV-45Copening.Theresultsofthequartermodelanalysisindicated substantial failureoftheentirequartermodelgeometry.

Considering thatTESisrequiredtoanalyzeforthesimultaneous openingofallthreeSVvalves(Reference 3),whichisamoresevereloadingcondition, itisevidentthatthequartermodelanalysisissufficient toprovethefailure,fortheemergency condition, ofbothUnits1and2.Therefore, thisreportforUnit1containsnoanalysisorresultsfortheSVthermalcondition ortheSVthermaltransient shockcondition.

ResultsoftheSVquartermodelanalysisperformed forUnit2arecontained intheUnit2report,TESTechnical ReportTR-5364-2 (Reference 6).

fq~y'Irs~t.sCta0 Technical ReportTR-5364-1 Revision02-2r>TEif23YNE ENGINEERINQ SERVICES.Section6containsastresssumaryofallnodepoints,asummaryofsupportloads,valveacceleration calculations, asumaryofpressurizer andquenchtanknozzleloads,andalistingofthemomentsontheendofeachvalveforallloadingconditions.

ItshouldbenotedthatvalvesNRV-151,NRV-152,NM0-151,NM0-152,'ndNMO-153areinexcessoftheveritical acceleration criteriaof2gforthePORVthermalshocktransient condition.

Thesevaluesareconsidered acceptable pertheapprovalgivenbyAEPintheirletterofMay26,1983fromMr.SamUlanofAEPtoMr.P.D.HarrisonofTES(Reference 7).

~FCCCCY~':fFC2~fAr!:.~sf~~CCC~,~C TechnicalReportTR-5364-1 Revision03-1-r<-TELEDYNE ENGINEERING SERV(CES3.0SYSTEMDESCRIPTION/DISCUSSION ThePressurizer Safety/Relief ValveDischarge Pipingconsistsofallofthepipingfromthepressurizer nozzles,downtothespargerinthequenchtank.Thisinformation isdepictedonTESdrawingE-5763,Revision2,generated fromAEPdrawings1-GRC-6,sheets1,',3,4;1-GRC-7;1-GRC-8;and1-GRC-9.The"Discharge" pipingconstitutes averylargesystemresulting inalargecomputermodel.Thesizeandgeometrical complexity, whichisduemainlytothesweepingcurvesaroundthepressurizer, complicates themodification effortinadditiontocausinglongerruntimes..Modification ofthiscomplexsystem,toattempttosecu'resatisfactory "SafetyValveDischarge" results,islimitedtodrainingtheSVloopseals.Heatingtheloopsealsisnotaviable"fix"becauseofthesizeoftheloops.Theselongloopscontainsufficient quantityofwatersuchthatonSVDischarge, thewatersealdoesnot"flash"completely enoughtoreducetheveryhighloadscausedbythewaterslug.Modification tothesupportsystemisalsoapooroptionbecauseoftheverylimitedspaceintheannulusaroundthepressurizer, whichmakesconstruction verydifficult.

Anotheraspectofthesystemthatcouldbeimprovedisthesettingoftheconstantspringsupports.

Duringthedataextraction ofthedeadweight analysisresults,itwasobservedthatthesupportsinthePORVloopareawerecausingsignificant upwarddisplacements ofthepipingsystem,asdetailed'in Section'.2.

Thestressesintheseregionsarehighand,althoughtheydonotexceedtheallowable, theycouldbereducedbyre-adjustment ofthespringsettings.

hg'=~~~4IQilL'~IfAI Technical ReportTR-5364-1 Revision04-1-ATELEDYNEENGINEERING SERVICES4.0THERMALFLUIDSANALYSIS4.1Introduction Thefollowing analysisdetermines thefluidforceswhichactonthepressurizer safetyandreliefvalvedischarge pipingoftheAmericanElectricPowerDonaldC.CookNuclearpowerPlant,Units1and2.Theseforcesaregenerated bythesuddenopeningofthepressurizer safetyandreliefvalvesduringoneormoreofthepressurizer transients described intheAEPsupplied1982lettertoTES.Theseforces,theresulting stressestheyapplytothepipingsystem,theresulting loadstheyimposeon'thepipesupports, andtheloadstheytransmittothesafetyandreliefvalvesbecameofincreased concernasaresultoftheincidentatThreeMileIsland.Following theThreeNileIslandincident, theNRCissuedNUREG0578andNUREG0737whichrequiredthateachutilitydetermine theeffectofsafety/reliefvalveoperation uponthevalveandthedischarge piping.Anelaborate programinvolving bothtestingandanalysiswasestablished underthegeneralmanagement oftheElectricPowerResearchInstitute (EPRI).Intensive testingofsafetyand~eliefvalveswasperformed atseverallocations acrossthecountry.Afullscalemodelofthepressurizer anddischarge pipingwasbuiltatCombustion Engineering inConnecticut.'imultaneously, ananalytical programwasinitiated tochooseandtestacomputerprogramwhichwouldpredictthefluidforces;RELAP5MODlwaschosen.ThisisthelatestinthefamilyofRELAPprogramsdeveloped attheIdahoNationalFngineeringLaboratory.

Inthisanalysis, TEShasusedRELAP5MOD1Version2.11asitismadeavailable throughControlDataCorpwithapost-processor, REPIPEversion3.10,whichcalculates thefluidforces.

I~'k~$glPiIAes~C Technical ReportTR-5364-1 Revision04-2-ri-TELEDYNE ENGlNEERlNG SERVlCESThisversion.ofRELAPSNOD1isidentified bythefollowing computerjobcontrollanguageatControlDataCorporation:

BEGIN,REIAP5,R5N2,INPUT=INPUTFILE, SCM=377000B Thecomputeranalysisprocedure forthethermalanalysisportionisincludedinAppendixA.RELAP5calculates hydrodynamic dataforcontrolvolumesineachsegmentofpipe.REPIPEthentakesthisdataanddefinestwoforcetimehistories forasegment.Onesetofinletjunctionforces,theotheroutletjunctionforces.SAP2SAPaddstheseforcetimehistories.

Finally,oneforcetimehistoryforeachsegmentofaxial,unbalanced loadsisanalyzedstructurally.

C+w~l Technical ReportTR-5364-1 Revision04-3>s-TELEOYNE ENGlNEERINQ SERVICES4.2RELAPModel4.2.1TheD.C.Cookpressurizer wasmodeledasasingletimedependent volumewiththefollowing transient conditions asspecified bytheAmericanElectricPower11/29/82lettertoLBS,pages1-7:Case1::~Sf'llSteam,LoopsealCaseZyooZhs'dPressurelWD/)gp+gR@~49pPc~o-e-o-p-ppgpg+PaloZt'o4pp25rgJ/OTime(Sec)

"('w,.:f~q;~.~=hlW4y/0 Technical ReportTR-5364-1 Revision0isTELEDYNEENQINEERlNQ SERVICESPORVSteam/Condensate SlugsCase255025002450Pressurepsi2400235023000.8Time(Sec)1.20.4Case2:Continuous WarmWater=400oF(SamepressureasPORV,Case1)4.2.2SafetyvalvesandpoweroperatedreliefvalvesweremodeledasRELAPjunctions usingthefollowing information:

SafetyValvemanufacturer CrosbyHB-BP-86(Ref.13)0if'CJJiTi0.022Ft20.010Sec.PORVMasoneilan NO-38-20721 (Ref.14)0.00806Ft21.0SecValveorificeareaswerecalculated usingtheEPRISafetyandReliefValveTestReport(Reference 16)andRELAP(RunIDBAICDRO)implementing ratedflows.Calculated valuesareincludedinSection4.6.1.

is'>'lyI'I1)I' Technical ReportTR-5364-1 Revision045]<TELEDYNEENGINEERING SERVICES4.2.3Discharge pipingwasmodeledfromallsafetyandpoweroperatedreliefvalvestothequenchtank.Thisdischarge pipingincludedthefollowing pipesizes:3inch,12inch4inch,6inch4inch3inch,6inchSCH40SCH40SSCH120SCH160Frictionfactorsfor1.5Dorshortradiusbendsandreducersweretakenfromtechnical paper8410byCrane.Calculations oftheselossesandconstants areincludedinAppendixA.SegmentlengthsusedarelistedinFigures4.2.1and4.2.2forbothmodels.Thedischarge pipingdefinessegmentswithsegmentsdescribed asstraightsectionsfromelbowtoelbow,valvetoelbow,etc.Also,alistingofRELAP5inputisincludedinthisreport.TheSRVmodelismodeledfromonesafetyvalvetothequenchtank.Thiswasdetermined tobeanadequaterepresentation ofsafetydischarge pipingforbothunitsandwillsubsequently bereferredtoas"TheQuarterModel".TheQuarterModelismodeledutilizing Unit2'sgeometry.'.2.4 TheQuenchTankwasmodeledintwoparts:thespargerandthetankitself.TheQuenchTankismodeledusingcylindrical volumescontaining waterandair.ThevolumesizesareequaltoquenchtankvolumesprovidedonWestinghouse Dwg.No.110E272.ThespargerforD.C.Cookisaperforated pipesubmerged inthewaterwithinthequenchtankasindicated inFigure4.2.3ofthisreport.Itisrepresented inRELAPasapipeequalinvolumeandsimilarly submerged.

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)<TELEDYNEENQINEERINQ SERVICESRevision0BYSA2DATE'/-XF-83 CHKD.BYE+DATE~4-15Z)ONAIDC.COO/Qg+LEpp((y5/lj.a7871&J~IVITS4r~Z.kE~LiV'5"ifÃnJC//~/IAJARP~L/Alb.SHEETNO.OF~PROJ.NO.IEQw~~o-pZIIji,tIoWkfj.II~j>~I~C1qI-I-IIQ00~SI!FIGURE4,2,3-6 TechnicalReportTR-5364-1 Revision04-16]5TELEDYNEENGINEERING SERVICES4.3RELAPModelControlVolumesTheEvaluation ofRELAP5/MOD1 forCalculation ofSafet/ReliefValveDischarePiinHdrodnamicLoadsreportpreparedbyIntermountain Technologies, Inc.recommends usingtenormorecontrolvolumesperboundedsegmentwhileavoidingsignificant controlvolumelengthdifferences topreservepressurewaveshapes.Thetencontrolvolumecriteriarecommended byITIwasadheredtoexceptinpipingarcsandinsegmentslessthanthreefeetinlength.TheD.C.Cookdischarge pipingismodeledusingasfewasonecontrolvolumepersegment(pipesegmentswithlengthslessthan0.5feet)anduptothirty-two controlvolumespersegment.Arcmodelingforbothunitsisrepresented inFigures4.3.1and4.3.2.AllarcsforUnits1and2weremodeledinRELAPashavingnofluidlosses.Essentially, RELAPcalculates theseasstraightsectionsofpipe.REPIPE,however,Jdistributes thecalculated forcestopre-assigned nodepointsmatchingtheTES~~structural models.AveragecontrolvolumelengthsusedfortheD.C.CookRELAPUnits1and2modelwere:PioeSizeAveraeC.V.Lenth3inchSCH1606inchSCH1604inchSCH40S6inchSCH40S12inchSCH403inchSCH404inchSCH1200.4644feet0.5264feet0.4471feet0.8614feet0.8064feet0.4744feet0.5056feetAschematic ofthedischarge systemsmodeledinRELAPforthePORV~~~~~~Unit1modelandtheSRV1/4modelforUnit2aregiveninFigures4.7.1and4.7.2,respectively.

Technica1ReportTR-5364-1 Revision04-17ATlHEDYNEENGINEERINQ SERVICESquenchTankmodelingwasachievedusingtwentycontrolvolumesandtwentyjunctions.

Eighteenvolumescomprisethespargermodelwhiletheremaining twoaresinglevolumesmodelingthewaterandairspacesofthequenchtank.Thewaterandairvolumesasdetermined fromWestinghouse Dwg.No.110E272wereinputtoRELAPtoinsureproperquenching capacity.

Eighteencontrolvolumesformingthespargerareinitially 88Kfullofwaterrepresenting asubmerged pipe.Thedischarge holesweremodeledasasingleholeofequivalent areaattheendofthepipe(aconservative assumption).

Finally,thetankrupturediskismodeledasapressureactuatedvalveplacedontheairvolumeandsettoblowoutat100psigdischarging toatmosphere.

(Figure4.2.3represents theD.C.CookUnits'and2quenchTank).

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Technical ReportTR-5364-1 Revision04-26ATELEDYNEENGINEERING SERVICES4.49Nd1Beforebeginning theas-builtanalysisforthesafetyvalves,itwasalmostcertainthattheloadswouldfailthesystem.AreviewofthetestingthatwasdoneatCombustion Engineering inConnecticut indicated thiswouldbethecase.Thecoldloopsealdischarge testatC.E.producedloadsof175Kips.TheD.C.CookUnits1and2pressurizershavethreesafetyvalveseachwithaloopseallargerthantheC.E.testfacilityloopseal.Therefore, itwasdecidedtomakeasmallRELAPmodeloftheD.C.CookSafetyValvedischarge line.Thismodelcontainsonesafetyvalve(SV45C)including itsloopsealpipinganditsdischarge pipingthrougharclevel669'-2"upto,butnotincluding, thequenchtank.Thismodelwouldbelessexpensive torunthanthefullthreevalvemodel.Theresultsofthissmall(quarterModel)confirmed oursuspicion thatthecoldloopsealcasewouldfail.Italsoallowedustomakeaparemetric studyofloopsealtemperature inloadsasisshownbelow.Onlythesteamdischarge provedtobeacceptable, therefore, TEShasrecomnened todraintheloopseals.LoopSealLoopSealTemperature PositionofValveOpeningMaxLoadCondition oFLooSealTimeSecLBFColdColdHotHotHotHot(Sat.Water)Steam141o141o350o350o350o650o650oUpstreamDownstream UpstreamUpstreamUpstreamUpstreamUpstream0.0100.0100.0100.0900.1300.0900.010115,000174,000156,000109,000124,00038,000,6,000Theloopsealtemperature distribution wascalculated tobeinputto~~~RELAPandisincludedintheAppendixA.Thetemperatures usedforthecoldloopsealr'angedfrom584.4oatthepressurizer to141.1oatthevalve.

Technical ReportTR-5364-l

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Technical ReportTR-5364-1 Revision04-36ATELEDYNEENGINEERING SERVICES4.5Unit1PORVModelTheinletpipingtothePORV'sisslopedtowardthevalves.Therefore, duringnormaloperating conditions asaturated water(condensate) loopsealisformedattheinlettothePORV.Asspecified inAmericanElectricPower'sletterofNovember29,1982,referring toPORVtransient conditions, thefollowing casesweremodeled:CaseTransient Condensate/Steam Discharge 400oSolidLiquidDischarge 4.5.1Thewayinwhichthecondensate/steam caseloopsealwastobemodeledwasdecidedbyusingtwomethodsonasmallsamplemodel.a~b.LowequalitySteamLoopSeal(Saturated Conditions)

SolidLoopSeal(Saturated Conditions)

Alowqualitysteamloopsealproducedoscillatory massflowratesthroughthevalve.Theseoscillations weresevereenoughtocauserejection ofthismodelandtochoosethesolidcondensate case.Theseoscillations aretheresultofnumerical instabilities inRELAPschokingcorrelation.

Thisisduetotheseverechangeinsonicvelocities inthetransition rangebetweensubcooled waterandsteam.4.5.2Bothcases(loopsealand400oFsolidliquiddischarge) weremodeledandrunonRELAPandREPIPE.Theresulting forcetimehistories werecompared.

Itwasnotclearatthislevelwhichcasewasmoresevere.Therefore, theforcetimehistories forbothcaseswereinputtothestructural program.Itcouldthenbeseenthatthe400oFsolidwaterdischarge condition wasthegoverning case.

Technical ReportTR-5364-1 Revision04-37->s-TELEDYNE.

ENGINEERINQ SERVICESBoththeloopsealandthesolidwatercaseexhibited unstablebehavior(o'sciIlationsintheflowrate).Theloopsealcaseshowedtheseoscillations inthetransition regionatthetailendoftheloopsealasitpassedthroughthevalve.RELAPtendstocauseflowrateoscillations becauseoftheseverechangeinsonicvelocities betweensubcooled waterandlowqualitysteam.Theseflowrateoscillations resultinhighforceswhichtendtobeoverlyconservative.

Inthe400oFsubcooled watercase,thereasonfortheflowrateoscillation wasmoreobscure.Atapproximately

.400secondstheflowsuddenlydecreases approximately 30Ibm/secinlmsec.ThiscanbeseeninSection4.7.2.AcarefulreviewoftheRELAPoutputdidnotrevealagoodphysicalreasonforsuchbehavior.

Reasonsforsuchbehaviorcouldbe1.Asuddenreduction inthevalveareavs.timedata.l2.Abuildupofbackpressureinthedischarge linewhichwillcausethevalveflowrateto'uddenly decrease..

3.Asuddendecreaseinpressureinthepressurizer boundarycondition whichwouldresultinreduced-flow.

Allthesethingswerecheckedtoseeiftheywerepossiblesourcesoftheflowratefluctuation.

Butthereviewindicated thattheywerenotthesourceoftheproblem.

Technical ReportTR-5364-1 Revision04-38r<TELEDYNEENGlNEERING SERVlcESApartialtabulation ofthisreviewisshownbelow:UNITIValveJunction¹410Cont.Yol.41101Cont.Vol.40926Reference RELAPRunBHFRFGGlowUnit.1200-600msecSo1idRed.Time.408.409Junction¹410Flow111.1883.424Cont.Yol.¹409260.00.0Cont.Vol.¹41101p248.89245.55Cont.Vol.¹40926p2342.83058.Itcanbeseenthatthedownstream pressuredoesnotexhibitasuddenincreasethatwouldreducetheflowthroughthevalve.Theupstreamqualityremainszerosothattheflowthroughthevalveissubcooled.

Thepressureincreases upstreamwhichcorresponds toasuddenreduction inflowarea.However,theflowareaincreases itdoesnotdecrease.

Thepressurizer timedependent volumedoesnotexhibitanysuddenchangeinpressurewhichwouldcorrespond tothisflowchange.Pastexperience withtheRELAPprogramshasshownproblemswithsubcooled waterandlowqualitysteamflow.Theseproblemshavemanifested themselves assevereoscillations intheflowrate.ItisouropinionthattheresultsfromtheRELAPrunarehighlyconservative andoverpredict thefluidforces.

Technical ReportTR-5364-1 Revision04-39ATELEDYNEENGlNEERlNQ SERVlCESMhenthefluidforcesfromthisRELAPrunarecombinedwiththeseismic,deadweight, andthermalexpansion loads,theallowables wereslighltyexceeded.

Sincetheprincipal fluidloadsappeartobearesultofaninstability intheflowratepredicted byRELAPandnotaresultofanactualphysicalphenomena, itwasdecidedthattheseloadswereoverlyconservative andcouldjustifiably bereducedby20K.'hefluidforcespresented inSection4.8andelsewhere inSection4.0aretheascalculated loadsandhavenotbeenreducedby2(C.Itshouldbenotedthatanalternative modelingpracticethatcouldhavebeenemployedinthesolutionofthisproblemwouldhavebeentomakethePORVvalvestimedependent junctions andspecifythevalveflowrate.Hadthisbeendone,theflowrateoscillation andtheirresulting forceswouldneverhaveoccurred, Techni,cal ReportTR-5364-1 Revision04-40ri-TELEOYNE ENGINEERING SERVICES4.6ValveFlowRateCalculation ValveTeTESFlowRateCalculated LBM/HRMaxRating*ForSteamBoreArea93XAccom.~IN~OpeningTimeSecC~rosbSafetyReliefValve523,332435,0003.6in20.010(Ref.18)Masoneilan 199,000OpdReliefValve1.0(Ref.16)*Themaximumratingforsteamat3Xaccumulation valueisfromtheCrosbyValveJandGageSafetyValveDrawingNo.H-51688,RevisionA.

Technical ReportTR-5634-1 Revision04-41]iTELEDYNEENQINEERINQ SERVICES,=4.6.1ThevalveflowratesusedinRELAPanalysisoftheSRVswereobtainedbyincreasing theASMEratedflowby15K;l(CtoconsidertheASMEunderating ofthetheoretical flowand5Xtocovertolerances.

TESflowratecalculations areincludedinFigure4.6.1.WT=51.5APASMEratedflow:WR=51.5A(1.03P+14.7)(.9)(.975)C where:(Ref.17)WT=theoretical flowWR=ratedflowcoefficients:

1.03-applies3Xaccumulation 0.975-valveflowcoefficient 0.9-represents theoretical flowratereduced1(CtoequalASMEratingTheequationTESusestocalculate thevalveflowrateisWmax=1.05x51.5A(1.03P+14.7)C(0.975) explained above.Thisisanincreaseof15KabovetheASMEratedflowas

Technical ReportTR-5364-1 Revision04-42-ri-TELEDYNE ENGINEERING SERVICES4.6.2TheMasoneilan PORVmaximumflowrateforsteamwastakenfromtheEPRISafetandReliefValveTestReortas199,000ibm/hr(Table4.5.1-1b).

Avalveopeningtimeof1.0secondsisusedbasedontotalvalveopeningtimesofallMasoneilan valvestestedlistedinTable4.5.2-1.Sincefullopentimesaveraged2.76seconds,withaminimumvalueof1.64seconds,TEShasassumed10(Copeningin1.0second,becauseindependent testinghasshownthatflowisnotalwaysdirectlyproportional tostemtravel.Mostoftenfullflowisobtainedbeforefullstemtravel.8ecause1secondisaverylongopeningtime,thiswasnotconsidered overlyconservative.

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Also,theordinateaxismaynotalwaysbecorrect;manytimesmultipliers willbeoff(COCisawareofthisprobleminRELAP).However,theydodepictthetrendaccurately andarecalculated andreportedinRELAPevery.0.001seconds.Correctpeaksandtimesatwhichtheyoccurarelistedwitheachtrace.PlotSetTransient4.7.1Unit14.7.2Unit14.7.3quarterModelCondensate/Steam Case400oSolidLiquidCaseColdLoopSeal/Steam CaseARELAPvolumeschematicprecedeseachplotset.

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