ML17326A635

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Forwards Addl Info Requested by NRC 790109 Ltr,Re Analyses of Containment Temp Response to Postulated Main Steam Line Breaks
ML17326A635
Person / Time
Site: Cook American Electric Power icon.png
Issue date: 04/01/1980
From: MALONEY G P
INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To: DENTON H R
Office of Nuclear Reactor Regulation
References
AEP:NRC:00131, AEP:NRC:131, NUDOCS 8004080367
Download: ML17326A635 (38)


Text

fREGULATORYIORHATIGNDISTRIBUTIONSYST(RIDS)SUBJECT;ForwardsaddijnforequestedbyNRC790109ltrireanalysesofcoptaipmenttempresponsetopostulatedmainsteamlinebreaks'ISTRIBUTIONCODE:A039SCOPIESRECEIVED:LTRiENCL9SIZE:'LTITLE:ResptoLessonLearnTaskForce1'Lestjnghouse'END,B~$'CC.ma7L7-0KvENOTES,,CAP8jYlif0'CF~RECIPIENTCOPIESRECIPIENTCOPIESIDCODE/NAMELtTTRENCLIDCODE/NAMELTTRENCLTIONi10BCORBWl,77ACINTERNALS005OLSVSSK.i~07BURDIO>>iJo17ILE21ENGBR23PLANTSYSBR25EFLTTRTSYSFIEIDSgM~OELD1111221111111002NRCPDR06KERRIGANJ,.08HILLISpC,20COREPERFBR22REACSFTYBR24EEBANDERSONeNIO'REILLYgp~TELFORDgJ,T'111111111111111122ACCESSIONNBR:8004080367DOCeDATE:80/04/01NOTARIZED:NODOCKETFACIL:50316DonaldC.CookNuclearPowerPlantrUnit2iIndianaL05000316AUTH~NAMFAUTHORAFFILIATIONMALONEY~G,PEIndiana8MichjganElectricCo.'ECIP~NAMERECIPIENTAFFILIATIONDENTON~H.R,OfficeofNuclearReactorRegulationEXTERNAL:03LPDR26ACRS111604NSIC11gCq'7TOTALNUMBEROFCOPIESREQUIRED:LTTRA5ENCL IJ INDIANA&MICHIGANELECTRICCOMPANYP.O.BOX18BOWLINGGREENSTATIONNEWYORK,N.Y.10004April1,1980AEP:NRC:00131'onaldC.CookNuclearPlantUnitNo.2DocketNo.50-316LicenseNo.DPR-74

Subject:

RequestforAdditionalInformation022.17Mr.HaroldR.Denton,DirectorOfficeofNuclearReactorReg'ulationU.S.NuclearRegulatoryCommissionWashington,D.C.20555

DearMr.Denton:

TheresponsetoRequestforAdditionalInformation022.17whichwasenclosedinMr.A.Schwencer'sletterofJanuary9,1979iscontainedintheattachmenttothisletter.Verytrulyyours,GPM/emcAttachment.P.alonVicePesidntcc:R.C.Callen-w/oatt.G.Charnoff-w/oatt.R.S.Hunter-w/oatt.R.W.Jurgensen-w/oatt.D.V.Shaller-Bridgman8004ooo><+,

4*~~~C,~~EIs,~~j)I!aI"r ATTACHMENTTOAEP:NRC:00131 L

~~ENCLOSUREReuestforAdditionalInformationDonaldC.CookNuclearPlant,Unit2DocketNo.50-316022.17Werequireadditionalinformationregardingyouranalysesofthecontai'nmenttemperatureresponsetopostulatedmainsteamlinebreak(s)whichyouprovidedinyourresponsetoNRCrequest022.9.Specifically,wewillrequirethefollowingtocompleteourreviewofthecontainmentresponsetopostulatedrupturesofthemainsteamlineinsidecontainment.Fortheworstsplitbreak(i.e.,30/powerlevelwithassumedfailureoftheauxiliaryfeedwaterrunoutprotectionsystem),providetheresultsofcontainmentresponseanalysesusingtheLOTIC-3codeforaspectrumofbreaksizesranginginsizeup.tothe0.942ft2breakpreviouslyanalyzed.Thespectrumofbreaksanalyzedshouldincludethelargestsplitbreakwhichwouldnotresultinautomaticinitiationofthecontainmentspraysystemandthelargestsplitbreakwhichwouldnotresultinautomaticinitiationofthecontainmentreturnairfan(s).Foreachbreakanalyzedprovide:1)afiguresimilartofigure022.9-2(Appendixg)showingupperandlowercompartmenttem-peratureasafunctionoftime;2)afigureshowingcontainmentpressureasafunctionoftime;3)atablesimilartoTable022.9-2(Appendixg)identifyingthemassandenergyreleaseratedatausedinthecontainmentanalyses;'and4)identificationofanyactionsassumedtobeperformedbyacontrolroomoperatorduringthecourseoftheaccidentandthe,timeatwhichoperatoractionsareassumedtooccurincludingjustificationfortheassumedoperatoractions.

Resonseto022.17RatherthanperformingaplantspecificanalysisforD.C.CookUnit2,agenerici'cecondenserplantsmallsteamlinebreakanalysiswasperformed.ItisshownhereinthatthedifferencesbetweenthegenericcontainmentparametersandblowdownreleasesandtheCook2valuesareeitherconservativeorunimportant.ThefollowingevaluationjustifiesthatreferencingthegenericworkforDonaldC.Cookisconservative.TheLOTIC-3computercodewasemployedinthegenericanalysis.TheLOTIC-3computercodehasbeendevelopedtoanalyzesteamlinebreaksinanicecondenserplant.Duringthedevelopmentofthiscomputercode,discussionandjustificationoftheheattransfercoefficientsandofthethermodynami'cequationshavebeenpresentedtotheNRC.DetailsoftheLOTIC-3computercodearegiveninReferences1to3.TheLOTIC-3computercodehasbeenfoundtobeacceptablefortheanalysisofsteamlinebreaks(Reference4)withthefollowingrestrictions:a.Massandenergyreleaseratesarecalculatedwithanapprovedmodel.b.Completebreakspectrumsareanalyzed.c.ConvectiveheatfluxcalculationsasdescribedinReference2,g7,areperformedforall'breaksizes.NRCquestion,022.9(Reference6)pertainstothesteamlinebreakanalysisanditssubsequentresponseinidentifyingthelimitingsmallbreak.Thefollowingevaluationwillillustratetheconservatisminthoseresultsandtherelativeinsensitivenatureofthecontainmentresponsetobreaksi'ze.Thenetcontainmentfreevolumeassumedinthegenericanalysiswas1,193,971ft3whiletheCook2freevolumeis1,241,384ft3.Further,thegenericplantlowercompartmentwasassumedtohaveavolumeof235,481ft3whilethefreevolumeoftheCook2lowercompartmentis254,'000ft3.Sincecontainmentvolumeisanimportantparameterindeterminingthecontainmentenvironmentalresponsetoasteamlinebreak,thiscomparisonillustratestheconservatismofreferencingthegenericwork.Theheatsinksinthelowercompartmentareofprimaryimportancesincethiscompartmentiswherethebreakoccursandconsequentlyex-periencesthemostsevereenvironment.Theheatsinksintheupperandicecondensercompartmentsareofsecondaryimportance.

1 TheareasandvolumesfortPeconcreteofthegenericplantaddupto25670ft2and47808ft~respectively,comparedto35459ft2and47358ft3forD.C.CookUnit2.Eventhoughtheconcretevolumeofthegenericplantisslightlygreater,(lessthan1Ã),thisis.morethanoffsetbythesurfaceareacomparisonwhich,duetothelowthermalconductivityofconcrete,isofmoreimportancetoheattransfer.ThiscomparisonthereforerevealsagreaterconcreteheattransferareaandheatremovalcapabilityofD.C.Cook,whichwouldresultinalowercalculatedpeaktemperature.Likewise,thesteelheatsinkcomparisondisplaysagreaterheattransferarea,volumeandheatremovalca@ability.Thegenericplant'sparametersare3955ft2and167ft~>comparedto40010ft2and580ft3forD.C.Cook>2Theheatsinksintheicecondenserareidenticalforbothplantcases.Theprecedingcomparison,illustratestheconservatismofthegenericplant'slowercompartmentheatsinks.IThelastcomparisonofcompartmentheatsinksisintheuppercompartment.Thegenerjcplant'supperscompartmentconcreteareaandvolume,are26123ft~and41722ft~respectively,comparedto60440ft2-and105970ft3forDC.Cook"2,Thesteelheattransferareasandvolumesare41302ft~and2034ftforthegenericplantand32500ft~and1524ft3forD.C.Cook"2".Althoughthegenericplantdoeshaveagreateruppercompartmentstructuralheatremovalcapabilityduetosteel,thisisofsecondaryimportanceintheanalysis-sincetheicecondenserallowsverylittlesteamintotheuppercom-partment,andthespraysystemhasthecapabilitytocooltheuppercompartment.Consequently,theuppercompartment'senvironmentisnotasevereoneandhaslittleimpactontheanalysis.TablesQ22.17-5andQ22.17-6areattachedlistingthevolumes,areas,materialsandadescriptionofcompartmentsforboththegenericandD.C.CookUnit2Plants.Twospraysystemsexistforcomparison.Theuppercompartmentsystemhaslittleimpactonthelowercompartmenttemperaturesoemphasiswillbeonthelowercompartment,spraysystem.Thegenericplantdoesnotemploy.alowercompartmentspraysystem,whereasD.C.CookUnit2doescontainalowercompartmentspraysystem(900gpm).SincethespraysystemofD.C.CookUnit2ismuchmoreefficientbecauseoflocationthanthatofthegenericplant,thereferencetogenericparametersisconservativewithrespecttoCook.InconjunctionwiththeabovecomparisonsafurtherjustificationandbasesforreferencingagenericplantanalysisfortheD.C.CookUnit2analysisisillustratedinFigureQ22.17-5.Thisfigu~econtainsacomparisonofthelimitingsmallbreakcases,0.942ft,fromtheCook2andgenericplant'sprevioussmallbreaksubmittals.FigureQ22.17-5illustratesthatthesmallsteamlinebreaktemperaturetransientsresultinverysimilarpeakswithanydifferencesbeingincidentaltotheresults.Inaddition,elevatedcontainmenttemperaturesforCooklast')forashorterdurationinthetransient.

Further,thecontatnmentpressureHi-2setpointwhichprovidestheactuationsi'gnalforthecontainmentsprayandfansystemswasassumedtobe3.5psi'ginthegenericanalysis.TheCook2Hi-2setpointis2.9psi'g.Therefore,theactuationsetpointwouldhavebeenreachedsoonerinD.C.Cook2andthereforethecontainmenttransientwouldhavebeenmitigatedmorerapidly.Theevaluationpresentedabove,illustratestheconservativecomparisonbetweenD.C.Cook2andthegenericplant'sheatsinksandplantparameters.Therefore,agenericLOTIC-II'Ispectrumofsmallbreaksanalysi'sisprovidedforD.C.Cook2insteadofaplantspecifi'canalysis.Thegenericanalysisprovidesthecontain-mentresponsesforaspectrumofsmallbreaksatthe305powerlevelwi'thassumedfailureoftheauxiliaryfeedwaterrunoutprotectionsystem.Theanalysesstudiedaspectrumofbreaksranginginsizefrom0.1ft2uptothybreakidentifiedasthemostseveresmallsplitbreak,0.942ft~.Thelowerboundbreaksizewasestablishedindiscussi'onsheldbetweentheNRCstaffandWestinghouseElectricCorporation.ItwasalsoreferencedintheSequoyahNuclearPlant'sresponsetoQ5.56A.I'hisspectrumincludedbreaksof.0.6,0.35and0.10ft.'ttached'iguresQ22.17-1andQ22.17-2providetheuppercompartmenttemperatureandlowercompartmentpressuretransients.AsFigureQ22.17-3shows,similarlowercompartmenttemperaturetransi'entswerecalculatedforthespectrumofbreaksanalyzed.However,the0.6ft2breakresultedinasli'ghtlyhighermaximumlowercompartmenttemperature.(SeeattachedTableQ22.17-1).Whenthistransientwascomparedtothetransientidentifiedasthemostseveresmallbreakat30%powerinthepreviousanalysi's,i'twasfoundtoresultinverysimilarpeaks,withthedifferencebeingi'ncidentaltotheresults.(SeeFigureQ22-17.4).Intheanalysis,sprayandfaninitiationareautomaticafterreachingthecontainmentHi-2setpoint.AssociatedtimesareincludedinTableQ22.17-1.Asdescribedabove,thesetimesareconservativeinregardtoCook2.TablesQ22.17-2,Q22.17-3,andQ22.17-4providethemassandenergyreleaseratesforthetransientsanalyzed.Theseresultsdemon-stratetheconservati'smoftheresultspreviouslysubmittedinresponsetoQ022.9andalsothesomewhat'nsensi'tivenatureoftheicecondenserplantcontai'nmentresponsetobreaksize.ThecomparisonillustratedinFigureQ.2217-5,betweenagenericplant'stemperaturetransientandthesametransientforCook2illustratesthekindofconservatismintroducedbyreferencingthegenericanalysis.TableQ22.17-7furtherdemonstratesthisconservatism.TheactualplantspecificanalysisresultsforthesmallerbreakswouldbesimilartotheCook2resultsinFigureQ.22.17-5.Thetemperaturewouldpeak,thensharplyfalloffwhenthesprayscomeon,andfinallysettletoamuchlowertemperaturelevelfortheremainderofthetransient.

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References:

1.C.Eicheldinger,Letterof10/22/76,¹NS-CE-12502.C.Eicheldinger,Letterof6/14/77,¹NS-CE-14533.C.Eicheldinger,Letterof12/7/77,¹NS-CE-16264.JohnF.Stolz,Letterof5/3/78,"EvaluationofProposedSupplementtoklCAP-8354(LOTIC-3)".5.D.C.Cook,FSAR,Section14.3.4,Page306.T.M.Anderson,Letterof9/20/78,¹NS-TNA-1946 t~3OCL'I0g2ocLI~IOO-0.4f'0o-3SW0.<Ft.o.OOoQ5oo+QJOOOr7IHE'EcFiguref22.17-1:UpperCompartmentTemperature~(3058ower'ev~'J)

~.$Q~u

=7-4.$0IIIIo.s5E't~+.o0)FC3.oIIPo0'I5oo~i~e(sec)-Figure922.17-2:LowerCompartmentPressure(305PowerLevel)

Woo'.'sSre300n</Ilo.lYt'72005IIooO.OO.C.500TIE=(Sit')iOOO,'igure922.17-3:Lower,CompartmentTemperature'305'owerLevel)

%guilt)'L

~~9~'03OO'lOZOOZl-+o.QA.P.IhOSg58vCRQ5~l.lOHMICPTQO4/4PbuJCR'o.sosfP)1OO0,0O.O)OOO5OQv>ve(sec)~,Figure(22.17-4:MorstBreakLowerCompartment'=TemperatureComparison(GenericAnalysis)

,'~~9-<<,~"4phL'py$'\ .30PI~PIIyoslSEVERS'RFfKRTZ0%P4L4~(o.~zA.'gAs'~'5o,ewz4c'ooO.O5oomvz(s~c)Figuref22.17-5:WorstBreakLowerCompartmentI.TemperatureComparison e~pl'IIt'I4C

-11=able(}22."17-1CASENAXINUNLCTENPoFTINEtSEC.TINEOFCONTAINNENT*SPRAYFAN0.6ft2326.1151.3953.605.0.35ft2325.8322.859.617:0.1ft2320.7651.106.663.*Hi-2PressureSetpointusedwas3.5psig,.Rela'ytimeusedforsprayactuationafterHi-2signalwas45secRelaytime,usedforfanactuationafterHi-2signalwas600sec. TIME.1000E-'01.1000E+01.3000E+01..7000E+01.1400E+02.2400E+02..2600E+02'2800E+02.3000E+02.3300E+02.3600E+02.4600E+02.5250E+02.5500E+02.5750E+02.6000E+02,.6750E+02.7000E+02.7500E+02.8500E+02.9500E+02;1000E+03'.1200E+03.1400E+03.1800E+03.2200E+03.2600E+03.3000E+03.3600E+03.4000E+03.4600E+03.5000E+03.5600E+03.6400E+03.7000E+03.7400E%03.8200E+03.8800E+03.9600E+03.1000E+04.Tablef22.17,-20.1FT2SPLIT'0PERCENTPOWER(lb/sec).2280E+03.2280E+03.2260E+03.2260E+03,2240E+03.2220E+03.~2250E+03.2280E+03.2290E+03.2300E+03.2300E+032290E+03.2280E+03,.2270E+03.2250E+03'.2220E+03.2150E+03,.2130E+03..2100E+03.2040E+03.2000E+03.1980E+03.1920E+03.1870E+03'.1790E+03.1730E+03.1670E+03.1620E+03.1550E+03.1500E+03.1440E+03.1400E+03.1340E+03.1270E+03'1220E+03.1190E+03.1130E+03.1090E+03.1040E+03.1020E+03e(BTU/SEC)~2712E+06.2712E+06.2688E+06.2688E+06.2665E+06.2642E+06..2677=E+06.2711E+06.2722E+06;2734E+06/.2734E+06.2723E+06.2711E+06.2700E+06'2677E+06.2643E+06*.2562E+06.2539E+06.2504E+06.2435E+06.2388E+06.2365E+06.2295E+06.2237E+06.2143E+06.2073E+06.2002E+06.1944E+06.1861E+06.1802E+06.1731E+06.1683E+06.1612E+06.1528E+06.1469E+06.1433E+06.1361E+06.1313E+06.1253E+06.1229E+06 3

r~~l-13-TINE'1000E-01.1000E+01.3000E+01.5000E+01..7000E+01.9000E+01~.1000E+02'1300E+02.1500E+02.1600E+02;1900E+02.2000E+02.2500E+02;3000E+02.3500E+OZ.4000E+02.5000E+OZ.6000E+02.7000E+02.8000E+02.9000E+02.1000E+03.1200E+03.1400E+03.1600E+03.1800EE.03.2000E+03.2400E+03.2800E+03.3200E+03.3600E+03.4000Ee03.5000E+03.6000E+03.7000E+03.8000E+03.9000E+03.1000E+04Table,(22.17-3'IT0~35"TZSPLIT30PERCENTPOWER(lb/sec).7970E+03.7970E+03.7890E+03...7820E+03.7760E+03.7700E+03.7680E+03.7760E+03.7800E+03.8960E+03.1240E+04.7720E+03'7090E+03.6630E+03.6280E+03.6010E+03*-.5630E+03;5350E+03.5140E+03.4970E+03.4830E+03.4700E+03.4500E+03.4320E+03.4160E+03.4020E+03.3890E+03,,.3650E+03.3440E+03.3240E+03.3060E+03.2890E+03.2530E+03.2230E+03.1990E+03.1790E+03.1620E+03.1480E+03e(BTU/SEC)..9480E+06.9480E+06.9388E+06-.9308E+06.7239E+06.9169E+06.9145E+06.9237E+06-9284E+06.1066E+07.1476E+07.9195E+06.8466E+06-7930E+06..7520E+06.7203E+06.6756E+06.6425E+06.6176E+06.5974E+06.5808E+06.5653E+06.5415E+06.5200E+06.5008E+06.4841f+06.4685E+06.4397E+06.4144E+06-.3904E+06.3687E+06.3481E+06.3046E+06.2683E+06.2392E+06.2150E+06.1944E+06.1774E<06 TIME.1000E-01.1000E+01.3000&01.5000E+01.7000&61,.8000E+01.1000E+02.1200E+02.1300E+02.1400E+02..1600E+02.1800E+02..2000E+02.2200E+02.2400E+02..2700E+02.3200E+02.3600E+02.4000E+02.4600E+02.5000E+02.6000E+02.7500E+OZ.9500E+02.1200E+03.1400E+03.1800E+03.2200E+03.2400E+03.2600E+03.3000E+03.3600E+03.4200E+03.5000E+03.5600E+03;6000E+03.8600E+03..9600E+03.9800E+03.1000E+04-14-.Table(22,17-40.6FTZSPLIT30PERCENTPOWER{lb/sec)..1365E+04.1365E+04.1341E+04.1320E+04.1302E+04.1293E+04.1297E+04.1298E+04.1Z97E+04.1268E+04.1196E+04.1133E+04.1079E+04.1033E+04.9940E+03.9440E+03.8800E+03.8420E+03.8110E+03.7740E+03.7540E+03.7130E+036680cq03.6250E+03.5840E+03.5570E+03.5110E+03.4720E+03.4530E+03".4350E+03.4020E+03.3600E+03.3250E+03~.2870E+03.2680E+03.2480E+03.1790E+03.1610E+03.1580E+03.1550E+03e.(BTU/SEC).1624E+07.1624E+07.1596E+07.1572E+07.1551E+07.1541E+07.1545E+07.1546E+07.1545f+07.1513E+07.1429E+07.1355E+07.1292E+07.1238E+07.1192E+07.1133E+07.1057E+07.1012E+07.9754E+06.9313E+06.9074E+06.8584E+06.8045E+06.7529E+06.7036E+06.6711E+06.6156E+06.5685E~06.5455E+06'5238E+06.4838E+06.4330E+06.3905E+06.3445E+06.3154E>06.2972E+06.2136E+06.1918E+06.1882E+06.1846E+06 Il~<gf'jt"\) Tablef22.17-5GENERICPLANTICECQNOENSEROESIGNPARAMETERSl.VOLUMEReactorContainmentYolume(Netfreevolume,ft3~UpperCompartmentUpperPlenumIceCondenser.ILowerPlenum.LowerCompartment(Active)670,10147,00086,30024,200235,481LowerCompartment(OeadEnded)UTotalContainmentYolumeTechSpecWeightofIceinCondenser,lbs130,8991,193,971.2.45x10

'krl~oABCS& A.UerComartmentTABLE-gcont)2.STRUCTURALHEATSlNKSAreaMaterialandThicknessftz(ft)1..-PolarCraneWa11,ContainmentShell,andMiseel1aneousSteelSlab1Slab2Slab32.RefuelingCanalandMiscel1aneousConcreteSlab4891531667720'254430.0005830.010170.000583.0.057580;001670.16700.001671.511PaintCarbonSteelPaintCarbonSteelPaintCarbonSteelPaintConcreteSlab5B.LowerCompartment1.PlatformsSlab12.SteamGeneratorSupports.andReactorCoolantPumpSupports6801,3750.00167Paint4.82Concre.e0.000583Paint0.007813CarbonSteelS'lab23.MiscellaneousConcreteSlab32,58023,3000.005830.06050.001671.645PaintSteelPaintConcrete 4..ReactorCavity-17-TABLE5(cont)STRUCTURALHEATSINKSAreaMaterialandThickness(ft2)(f't)Slab45.BaseFloor*Slab5C.IceCondenser1.IceBaskets2,3704,2280.001674.00.001672.0PaintConcretePaintConcreteSlab1180,628'.00663Steel'.LatticeFramesSlab23.LowerSupportFractureSlab34.IceCondenserFloor76,6500.021728,6700.0267SteelSteelSlab45.ContainmentWallpanelsandContainmentShell3,3360.000833Paint0.333ConcreteSlab56.CraneWallPanelsandCraneWall,Slab6~19,1001.00.062513,0551.01.0SteelItInsulationSteelShellSteelImInsulationConcreteP

~~-18-TabIef22.17-6O.C.COOKUNIT2ICECONDENSERDESIGNPARA'!ETERSReactorContainmentYoIumeUpper,CompartmentLowerCompartmentIceCondenser.DeadEndedTota1Vo1ume798742ft3254000ft3126940ft361702ft31,241,384ft3TechSpecWeightoficeinCondenser,lbs.2.37x18

'0'I Wall"5'ompartmentUC..UCUCLCLC'LCTABLE6(cont)STRUCTURALHEATSINKSAreaMaterial58801197050691366016730Paint/ConcretePaint/ConcretePaint/ConcretePaint/ConcretePaint/Concrete32500Paint/Steel/Concrete10090Paint/ConcreteThickness(ft)0.001/0.0469/2.00.001/2.0'.001/1.50.001/1.00.001/2-00.001/1.50.001/1.08LCLC86656995Paint/ConcretePaint/Steel0.001/2.00.001/0.0081012LCLCLC33401170Paint/SteelS.Steel23650Paint/Steel0.001/0.00960.001/0.04190.033413LCLC2764580LeadPaint/Steel0.250.001/0.014915.161819IBIBIB-IBIB180600Steel76650Steel28670Steel333619100Paint/ConcreteInsulationandSteo'1/Concrete0.00660.0220.02670.0008/1.51.0/0.062520IB13060InsulationandSteel/Concrete1.0/1.0 Tableq22.1?-7KEYPARAMETERSAFFECTINGSPLITSTENLINE8REAKSYariableFallLoadSteam'Pressure(psia)ValuesUsedin,Yaluesfor~L'DTIC-3II0.C.COOOO820PlantPower(t4vt)TimeDelaytoFeedlineIsolation(sec)TimeDelaytoSteamLineIsolation(sec).3425153403<9.0<9.0 iJg0P31ASKg~s'j-~t~.