ML17326A635

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
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

fREGULATORY IORHATIGNDISTRIBUTION SYST(RIDS)SUBJECT;Forwardsaddijnforequested byNRC790109ltrireanalysesofcoptaipment tempresponsetopostulated mainsteamlinebreaks'ISTRIBUTION CODE:A039SCOPIESRECEIVED:LTR iENCL9SIZE:'LTITLE:ResptoLessonLearnTaskForce1'Lestjnghouse'END,B

~$'CC.ma7L7-0KvENOTES,,CAP8jYlif0'CF~RECIPIENT COPIESRECIPIENT COPIESIDCODE/NAME LtTTRENCLIDCODE/NAME LTTRENCLTIONi10BCORBWl,77ACINTERNALS 005OLSVSSK.i~07BURDIO>>iJo17ILE21ENGBR23PLANTSYSBR25EFLTTRTSYSFIEIDSgM~OELD1111221111111002NRCPDR06KERRIGANJ,.08HILLISpC,20COREPERFBR22REACSFTYBR24EEBANDERSONeNI O'REILLYgp

~TELFORDgJ,T' 111111111111111122ACCESSION NBR:8004080367 DOCeDATE:

80/04/01NOTARIZED:

NODOCKETFACIL:50316DonaldC.CookNuclearPowerPlantrUnit2iIndianaL05000316AUTH~NAMFAUTHORAFFILIATION MALONEY~G,PE Indiana8MichjganElectricCo.'ECIP~NAMERECIPIENT AFFILIATION DENTON~H.R, OfficeofNuclearReactorRegulation EXTERNAL:

03LPDR26ACRS111604NSIC11gCq'7TOTALNUMBEROFCOPIESREQUIRED:

LTTRA5ENCL IJ INDIANA&MICHIGANELECTRICCOMPANYP.O.BOX18BOWLINGGREENSTATIONNEWYORK,N.Y.10004April1,1980AEP:NRC:00131

'onaldC.CookNuclearPlantUnitNo.2DocketNo.50-316LicenseNo.DPR-74

Subject:

RequestforAdditional Information 022.17Mr.HaroldR.Denton,DirectorOfficeofNuclearReactorReg'ulation U.S.NuclearRegulatory Commission Washington, D.C.20555

DearMr.Denton:

TheresponsetoRequestforAdditional Information 022.17whichwasenclosedinMr.A.Schwencer's letterofJanuary9,1979iscontained intheattachment tothisletter.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-Bridgman 8004ooo><+,

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

~~ENCLOSURE ReuestforAdditional Information DonaldC.CookNuclearPlant,Unit2DocketNo.50-316022.17Werequireadditional information regarding youranalysesofthecontai'nment temperature responsetopostulated mainsteamlinebreak(s)whichyouprovidedinyourresponsetoNRCrequest022.9.Specifically, wewillrequirethefollowing tocompleteourreviewofthecontainment responsetopostulated rupturesofthemainsteamlineinsidecontainment.

Fortheworstsplitbreak(i.e.,30/powerlevelwithassumedfailureoftheauxiliary feedwater runoutprotection system),providetheresultsofcontainment responseanalysesusingtheLOTIC-3codeforaspectrumofbreaksizesranginginsizeup.tothe0.942ft2breakpreviously analyzed.

Thespectrumofbreaksanalyzedshouldincludethelargestsplitbreakwhichwouldnotresultinautomatic initiation ofthecontainment spraysystemandthelargestsplitbreakwhichwouldnotresultinautomatic initiation ofthecontainment returnairfan(s).Foreachbreakanalyzedprovide:1)afiguresimilartofigure022.9-2(Appendix g)showingupperandlowercompartment tem-peratureasafunctionoftime;2)afigureshowingcontainment pressureasafunctionoftime;3)atablesimilartoTable022.9-2(Appendix g)identifying themassandenergyreleaseratedatausedinthecontainment analyses;

'and4)identification ofanyactionsassumedtobeperformed byacontrolroomoperatorduringthecourseoftheaccidentandthe,timeatwhichoperatoractionsareassumedtooccurincluding justification fortheassumedoperatoractions.

Resonseto022.17Ratherthanperforming aplantspecificanalysisforD.C.CookUnit2,agenerici'cecondenser plantsmallsteamline breakanalysiswasperformed.

Itisshownhereinthatthedifferences betweenthegenericcontainment parameters andblowdownreleasesandtheCook2valuesareeitherconservative orunimportant.

Thefollowing evaluation justifies thatreferencing thegenericworkforDonaldC.Cookisconservative.

TheLOTIC-3computercodewasemployedinthegenericanalysis.

TheLOTIC-3computercodehasbeendeveloped toanalyzesteamline breaksinanicecondenser plant.Duringthedevelopment ofthiscomputercode,discussion andjustification oftheheattransfercoefficients andofthethermodynami'c equations havebeenpresented totheNRC.DetailsoftheLOTIC-3computercodearegiveninReferences 1to3.TheLOTIC-3computercodehasbeenfoundtobeacceptable fortheanalysisofsteamline breaks(Reference 4)withthefollowing restrictions:

a.Massandenergyreleaseratesarecalculated withanapprovedmodel.b.Completebreakspectrums areanalyzed.

c.Convective heatfluxcalculations asdescribed inReference 2,g7,areperformed forall'break sizes.NRCquestion, 022.9(Reference 6)pertainstothesteamline breakanalysisanditssubsequent responseinidentifying thelimitingsmallbreak.Thefollowing evaluation willillustrate theconservatism inthoseresultsandtherelativeinsensitive natureofthecontainment responsetobreaksi'ze.Thenetcontainment freevolumeassumedinthegenericanalysiswas1,193,971 ft3whiletheCook2freevolumeis1,241,384 ft3.Further,thegenericplantlowercompartment wasassumedtohaveavolumeof235,481ft3whilethefreevolumeoftheCook2lowercompartment is254,'000ft3.Sincecontainment volumeisanimportant parameter indetermining thecontainment environmental responsetoasteamline break,thiscomparison illustrates theconservatism ofreferencing thegenericwork.Theheatsinksinthelowercompartment areofprimaryimportance sincethiscompartment iswherethebreakoccursandconsequently ex-periences themostsevereenvironment.

Theheatsinksintheupperandicecondenser compartments areofsecondary importance.

1 TheareasandvolumesfortPeconcreteofthegenericplantaddupto25670ft2and47808ft~respectively, comparedto35459ft2and47358ft3forD.C.CookUnit2.Eventhoughtheconcretevolumeofthegenericplantisslightlygreater,(lessthan1Ã),thisis.morethanoffsetbythesurfaceareacomparison which,duetothelowthermalconductivity ofconcrete, isofmoreimportance toheattransfer.

Thiscomparison therefore revealsagreaterconcreteheattransferareaandheatremovalcapability ofD.C.Cook,whichwouldresultinalowercalculated peaktemperature.

Likewise, thesteelheatsinkcomparison displaysagreaterheattransferarea,volumeandheatremovalca@ability.

Thegenericplant'sparameters are3955ft2and167ft~>comparedto40010ft2and580ft3forD.C.Cook>2Theheatsinksintheicecondenser areidentical forbothplantcases.Thepreceding comparison,illustrates theconservatism ofthegenericplant'slower compartment heatsinks.IThelastcomparison ofcompartment heatsinksisintheuppercompartment.

Thegenerjcplant'supperscompartment concreteareaandvolume,are26123ft~and41722ft~respectively, comparedto60440ft2-and105970ft3forDC.Cook"2,Thesteelheattransferareasandvolumesare41302ft~and2034ftforthegenericplantand32500ft~and1524ft3forD.C.Cook"2".Although thegenericplantdoeshaveagreateruppercompartment structural heatremovalcapability duetosteel,thisisofsecondary importance intheanalysis-sincetheicecondenser allowsverylittlesteamintotheuppercom-partment, andthespraysystemhasthecapability tocooltheuppercompartment.

Consequently, theuppercompartment's environment isnotasevereoneandhaslittleimpactontheanalysis.

TablesQ22.17-5andQ22.17-6areattachedlistingthevolumes,areas,materials andadescription ofcompartments forboththegenericandD.C.CookUnit2Plants.Twospraysystemsexistforcomparison.

Theuppercompartment systemhaslittleimpactonthelowercompartment temperature soemphasiswillbeonthelowercompartment, spraysystem.Thegenericplantdoesnotemploy.alowercompartment spraysystem,whereasD.C.CookUnit2doescontainalowercompartment spraysystem(900gpm).SincethespraysystemofD.C.CookUnit2ismuchmoreefficient becauseoflocationthanthatofthegenericplant,thereference togenericparameters isconservative withrespecttoCook.Inconjunction withtheabovecomparisons afurtherjustification andbasesforreferencing agenericplantanalysisfortheD.C.CookUnit2analysisisillustrated inFigureQ22.17-5.

Thisfigu~econtainsacomparison ofthelimitingsmallbreakcases,0.942ft,fromtheCook2andgenericplant'sprevioussmallbreaksubmittals.

FigureQ22.17-5illustrates thatthesmallsteamline breaktemperature transients resultinverysimilarpeakswithanydifferences beingincidental totheresults.Inaddition, elevatedcontainment temperatures forCooklast')forashorterdurationinthetransient.

Further,thecontatnment pressureHi-2setpointwhichprovidestheactuation si'gnalforthecontainment sprayandfansystemswasassumedtobe3.5psi'ginthegenericanalysis.

TheCook2Hi-2setpointis2.9psi'g.Therefore, theactuation setpointwouldhavebeenreachedsoonerinD.C.Cook2andtherefore thecontainment transient wouldhavebeenmitigated morerapidly.Theevaluation presented above,illustrates theconservative comparison betweenD.C.Cook2andthegenericplant'sheatsinksandplantparameters.

Therefore, agenericLOTIC-II'I spectrumofsmallbreaksanalysi's isprovidedforD.C.Cook2insteadofaplantspecifi'c analysis.

Thegenericanalysisprovidesthecontain-mentresponses foraspectrumofsmallbreaksatthe305powerlevelwi'thassumedfailureoftheauxiliary feedwater runoutprotection system.Theanalysesstudiedaspectrumofbreaksranginginsizefrom0.1ft2uptothybreakidentified asthemostseveresmallsplitbreak,0.942ft~.Thelowerboundbreaksizewasestablished indiscussi'ons heldbetweentheNRCstaffandWestinghouse ElectricCorporation.

Itwasalsoreferenced intheSequoyahNuclearPlant'sresponsetoQ5.56A.I'hisspectrumincludedbreaksof.0.6,0.35and0.10ft.'ttached

'iguresQ22.17-1andQ22.17-2providetheuppercompartment temperature andlowercompartment pressuretransients.

AsFigureQ22.17-3shows,similarlowercompartment temperature transi'ents werecalculated forthespectrumofbreaksanalyzed.

However,the0.6ft2breakresultedinasli'ghtly highermaximumlowercompartment temperature.

(SeeattachedTableQ22.17-1).

Whenthistransient wascomparedtothetransient identified asthemostseveresmallbreakat30%powerinthepreviousanalysi's, i'twasfoundtoresultinverysimilarpeaks,withthedifference beingi'ncidental totheresults.(SeeFigureQ22-17.4).

Intheanalysis, sprayandfaninitiation areautomatic afterreachingthecontainment Hi-2setpoint.

Associated timesareincludedinTableQ22.17-1.

Asdescribed above,thesetimesareconservative inregardtoCook2.TablesQ22.17-2, Q22.17-3, andQ22.17-4providethemassandenergyreleaseratesforthetransients analyzed.

Theseresultsdemon-stratetheconservati'sm oftheresultspreviously submitted inresponsetoQ022.9andalsothesomewhat'nsensi'tive natureoftheicecondenser plantcontai'nment responsetobreaksize.Thecomparison illustrated inFigureQ.2217-5,betweenagenericplant'stemperature transient andthesametransient forCook2illustrates thekindofconservatism introduced byreferencing thegenericanalysis.

TableQ22.17-7furtherdemonstrates thisconservatism.

TheactualplantspecificanalysisresultsforthesmallerbreakswouldbesimilartotheCook2resultsinFigureQ.22.17-5.

Thetemperature wouldpeak,thensharplyfalloffwhenthesprayscomeon,andfinallysettletoamuchlowertemperature levelfortheremainder ofthetransient.

qAV

References:

1.C.Eicheldinger, Letterof10/22/76,

¹NS-CE-1250 2.C.Eicheldinger, Letterof6/14/77,¹NS-CE-1453 3.C.Eicheldinger, Letterof12/7/77,¹NS-CE-1626 4.JohnF.Stolz,Letterof5/3/78,"Evaluation ofProposedSupplement toklCAP-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:UpperCompartment Temperature

~(3058ower'ev~'J)

~.$Q~u

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

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

%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

'=Temperature Comparison (GenericAnalysis)

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

WorstBreakLowerCompartment I.Temperature Comparison e~pl'IIt'I4C

-11=able(}22."17-1 CASENAXINUNLCTENPoFTINEtSEC.TINEOFCONTAINNENT*

SPRAYFAN0.6ft2326.1151.3953.605.0.35ft2325.8322.859.617:0.1ft2320.7651.106.663.*Hi-2PressureSetpointusedwas3.5psig,.Rela'ytimeusedforsprayactuation afterHi-2signalwas45secRelaytime,usedforfanactuation afterHi-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,-2 0.1FT2SPLIT'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+04 Table,(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"\) Tablef22.17-5GENERICPLANTICECQNOENSER OESIGNPARAMETERS l.VOLUMEReactorContainment Yolume(Netfreevolume,ft3~UpperCompartment UpperPlenumIceCondenser

.ILowerPlenum.LowerCompartment (Active)670,10147,00086,30024,200235,481LowerCompartment (OeadEnded)UTotalContainment YolumeTechSpecWeightofIceinCondenser, lbs130,8991,193,971.

2.45x10

'krl~oABCS& A.UerComartmentTABLE-gcont)2.STRUCTURAL HEATSlNKSAreaMaterialandThickness ftz(ft)1..-PolarCraneWa11,Containment Shell,andMiseel1aneousSteelSlab1Slab2Slab32.Refueling CanalandMiscel1aneousConcreteSlab4891531667720'254430.0005830.010170.000583.0.057580;001670.16700.001671.511PaintCarbonSteelPaintCarbonSteelPaintCarbonSteelPaintConcreteSlab5B.LowerCompartment 1.PlatformsSlab12.SteamGenerator Supports.andReactorCoolantPumpSupports6801,3750.00167Paint4.82Concre.e0.000583Paint0.007813CarbonSteelS'lab23.Miscellaneous ConcreteSlab32,58023,3000.005830.06050.001671.645PaintSteelPaintConcrete 4..ReactorCavity-17-TABLE5(cont)STRUCTURAL HEATSINKSAreaMaterialandThickness (ft2)(f't)Slab45.BaseFloor*Slab5C.IceCondenser 1.IceBaskets2,3704,2280.001674.00.001672.0PaintConcretePaintConcreteSlab1180,628'.00663 Steel'.LatticeFramesSlab23.LowerSupportFractureSlab34.IceCondenser Floor76,6500.021728,6700.0267SteelSteelSlab45.Containment WallpanelsandContainment Shell3,3360.000833Paint0.333ConcreteSlab56.CraneWallPanelsandCraneWall,Slab6~19,1001.00.062513,0551.01.0SteelItInsulation SteelShellSteelImInsulation ConcreteP

~~-18-TabIef22.17-6O.C.COOKUNIT2ICECONDENSER DESIGNPARA'!ETERS ReactorContainment YoIumeUpper,Compartment LowerCompartment IceCondenser

.DeadEndedTota1Vo1ume798742ft3254000ft3126940ft361702ft31,241,384 ft3TechSpecWeightoficeinCondenser, lbs.2.37x18

'0'I Wall"5'ompartment UC..UCUCLCLC'LCTABLE6(cont)STRUCTURAL HEATSINKSAreaMaterial58801197050691366016730Paint/Concrete Paint/Concrete Paint/Concrete Paint/Concrete Paint/Concrete 32500Paint/Steel/Concrete 10090Paint/Concrete Thickness (ft)0.001/0.0469/2.00.001/2.0

'.001/1.50.001/1.00.001/2-0 0.001/1.5 0.001/1.0 8LCLC86656995Paint/Concrete Paint/Steel 0.001/2.0 0.001/0.008 1012LCLCLC33401170Paint/Steel S.Steel23650Paint/Steel 0.001/0.0096 0.001/0.0419 0.033413LCLC2764580LeadPaint/Steel 0.250.001/0.0149 15.161819IBIBIB-IBIB180600Steel76650Steel28670Steel333619100Paint/Concrete InsulationandSteo'1/Concrete0.00660.0220.02670.0008/1.5 1.0/0.0625 20IB13060Insulation andSteel/Concrete1.0/1.0 Tableq22.1?-7KEYPARAMETERS AFFECTING SPLITSTENLINE8REAKSYariableFallLoadSteam'Pressure (psia)ValuesUsedin,Yaluesfor~L'DTIC-3 II0.C.COOOO820PlantPower(t4vt)TimeDelaytoFeedlineIsolation (sec)TimeDelaytoSteamLineIsolation (sec).3425153403<9.0<9.0 iJg0P31ASKg~s'j-~t~.