ML17146A595

Rev 1 to Susquehanna Steam Electric Station Units 1 & 2 Fire Protection Program,App R,Deviation Request 6, Nonfireproofed Structural Steel.

ML17146A595
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Site:	Susquehanna
Issue date:	10/31/1986
From:	PENNSYLVANIA POWER & LIGHT CO.
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PROC-861031, NUDOCS 8611060168
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SUSQUEHANNASTEAMELECTRICSTATIONUNITS152FIREPROTECTIONPROGRAMAPPENDIXRDEVIATIONREQUESTNO.6NONFIREPROOFEDSTRUCTURALSTEELSUMMARYREPORTFORSTRUCTURALSTEELEVALUATIONREVISION110/86Sbigpb1bap5pppg87ebgP31ADOGVpgRF

SUMMARYREPORTFORSTRUCTURALSTEELEVALUATION

1.0INTRODUCTION

2.0METHODOLOGY3.0CRITERIAANDJUSTIFICATION3.1GeneralCriteria3.2TechnicalBas'is3.3TwoHorizontalCableTrayCriteria3.4NFPA13SprinklerCriteria3.5Case-by-caseFireProtectionEvaluation4.0RESULTS5.0MODIFICATIONS6.0SCHEDULE7.0COMPENSATORYMEASURES

8.0CONCLUSION

APPENDIXA-FiguresAPPENDIXB-References

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FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE3of28SUMMARYREPORTFORSTRUCTURALSTEELEVALUATIONUNIT152REACTORBUILDINGSAPPENDIXRDEVIATIONREVESTNO.61.0IntroductionDeviationRequestNo.6wassubmittedtotheNRCinSeptember1985(PLA-2529)requestingapprovalofexposed(non-fireproofed)structuralsteelwhichsupportsfireareabarriersintheUnit1and2ReactorBuildings,andsupportselevation754'ftheControlStructure.AfterreviewingtheDeviationRequest,theNRCrequestedadditionaljustification.InresponsetotheNRCrequest,PP&LsubmittedtheStructuralSteelActionPlantotheNRCfortheirconcurrenceonFebruary10,1986(PLA-2592).Theinitialsubmittal,outlinedinRevision0tothisreport,wassubmittedtotheNRConMay19,1986.Subsequenttotheinitialsubmittal,ameetingwasheldintheNRCOfficeinBethesda,MDonJuly30,1986todiscussthesubmittal.DuringthismeetingtheNRCrequestedthatPPSLrevisetheirsubmittalandprovidethefollowing:oConsiderationoftheeffectsofslabopeningsand'theuseofa100Ãliveloadcriteria.oSpecificdetailsoftheareasrequiredtobefirerated.OursummaryreporthasbeenrevisedtorespondtotheNRCrequests.Methodologychanges,differentthanthoseproposedinouractionplansubmittedwithPLA-2592,haveoccurredasaresultofNRCcomments.Thesechangesareexplainedinthereport.Thisreportspecificallyaddressesthefire-ratedbarriersintheUnit1and2ReactorBuildings.Allfire-ratedbarrierscoveredbyDeviationRequest0'6,exceptone,arelocatedintheUnit1and2ReactorBuildings.TheoneexceptionistheceilingabovethemaincontrolroomintheControlStructure.Thewrite-upwithinthebodyofDeviationRequestb'6isconsideredtohaveadequatelyaddressedthecombustibleconfigurationsothesubjectisnotspecificallyaddressedinthereport.Finally,inresponsetoconcernsexpressedverballybytheNRCstaff,wehavetakentheinitiativetoreviewallofthestructuralsteelintheUnit1and2ReactorBuildingsregardlessofwhetherornotthestructuralsteelwaspartofafire-ratedbarrier.

~Qfe5I~~~f'i!',"...Qr~liVl.l~i~"J'lf.C~vt.',sC()QI5ft!~i.'",~'9lft~'~-lQfJImA~!gf1~.&f'fI'4 FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE4of282.0N~hd1Themethodologyoutlinedbelow,whichdiffersfromthemethodologyoutlinedinPLA-2592,wasusedinperformingourupdatedanalysis.AllstructuralsteelinboththeUnit1andUnit2ReactorBuildingswasreviewed.ThestructuralsteelframingplanforeachfloorelevationineachReactorBuildingwasreviewedandtheminimumsetofstructuralsteelframingmembersrequiredtoinsurestructuralintegritywasselected.Thisminimumsetofstructuralsteelframing'memberswasselectedonthepremisethatthethickreinforcedconcreteslabsusedintheconstructionoftheReactorBuildingsareabletospansignificantlylongerdistancesthanthenormalbeamtobeamspanrequiredbyotherdesignbasisaccidentscenarios.Sincetheseotherdesignbasisaccidentscenariosneednotbeconsideredinconjunctionwithafire,muchofthestructuralsteelinstalledintheReactorBuildingisnotnecessarytomaintainstructuralintegrityforthefirescenario.Inselectingtheminimumsetofrequiredstructuralframingmembers,thefollowingrestrictionswereapplied:oThereinforcedconcreteslabmustbeabletosupport100'5ofthe~allowableliveloadshownontheexistingstructuralframingplandrawings.Thelossofstructuralcontinuityasaresultofhatchopeningsandpenetrationsmustbeconsidered.oTheselectedstructuralsteelframingbeamsmustbecapableofcarryinganyincreasedloadingscausedbytheeliminationofadjacentmemberstothebuildinggirdersand/orcolumns.Similarily,thebuildinggirdersand/orcolumnsmustbecapableofsupportinganyincreasedloading.Eachspecificconcreteslabsectionwasevaluatedtoassurethatthefirstcriteriaoutlinedabovewasmet.Eachrequiredstructuralsteelframingmemberwasreviewedfortheeffectsofanyadditionalloadimposedonthememberandfortheeffectsofthecombustibleconfigurationneareachmember.Anyrequiredstructuralsteelframingmemberwithamaximumoftwohorizontalcabletraysinitsvicinitywasevaluatedtobeacceptable.(SeeSection3.3-TwoHorizontalCableTrayCriteriaforanexplanationofandjustificationofthiscriteria.)AnyrequiredstructuralsteelframingmemberlocatedinareasprotectedbyanNFPA13sprinklersystemswasevaluatedtobeacceptable.(SeeSection3.4-NFPA13SprinklerCriteria,foranexplanationofandjustificationforthiscriteria.)Allremainingrequiredstructuralsteelframingmemberswereevaluatedwithrespecttofireprotectiononacase-by-casebasis.Byreviewingeachmemberandthecombustibleconfigurationinthevicinityofthe ll,9"~~+pe'pyr1Gi

\FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE5of28member,thefireprotectionevaluationdeterminedthatstructuralsteeltemperaturescouldnotberaisedabove1000'F.Thecase-by-casefireprotectionevaluationisexplainedinSection3.5.3.0CriteriaandJustification3.1GeneralCriteriaInthepastithasbeencommontocalculatetheaveragecombustibleloadingbydistributingallcalculatedcombustiblesuniformlyovertheentirefloorareaandcomparingtheresultswiththefireratingofthestructure.Whilethismethodprovidesaroom-to-roomcomparison,itfailstoconsidersuchparametersascombustibleconcentration,fuelarrangement,andburningrates.Theseaveragecombustibleloadingshavetraditionallybeencomparedtofire-ratedcomponentstestedtotheStandardTimeTemperatureCurve(Ref.2).Morerecently,thisapproachhascomeunderattackasbeingunconservativeincertainapplicationsbecauseitfailstoaddresstheconditionwherethemajorityofthecombustiblesinanareaareconcentratedinasmallportionofthearea.PPSLbasedthestructuralsteeleva'luationonacomparisonofcombustibleconfigurationineachareausingactualcabletrayfiretestdata.CabletraysarethepredominantfirehazardintheReactorBuildings.Thecabletrayfiretestsreferencedtakeintoaccounttheactualfuelarrangementwithinthecabletray,combustibleconfiguration,andburningrates.Thecriticalsteelfailuretemperatureusedintheevaluationcriteriawasbasedonthe1000FaveragetemperatureacceptancecriteriafoundintheNationalFireProtectionAssociation'sstandardusedfortestingfireproofingforstructuralsteel(NFPA-251).Sincefireproofingmaterialsaredesignedtomaintainstructuralsteeltemperaturesbelowthislevel,wecanconcludethatfireswhichdonotheatthestructuralsteeltothiscriticaltemperaturewillnotresultinlossofstructuralintegrity.ThisconclusionisfurthersubstantiatedbyinformationprovidedbytheAmericanInstituteofSteelConstruction.TheAmerican'InstituteofSteelConstructionManual(Ref.8)statesthatsteelmaintainsapproximately63Kofitsyieldstrengthat1000'Fandapproximately374ofitsyieldstrengthat1200'F.ThenormalA.I.S.C.allowablestressinbendingisintherangeof60to66Kofitsyieldstrength.Sinceitisreasonabletoclassifythefireconditionasanextremeenvironmentalloadingcombination,itshouldfollowthat.forthisloadingcombinationtheallowablestressshouldbepermittedtoapproachtheyieldstrengthofthemateria1.Therefore,byrestrictingstructuralsteeltemperatureto1000'F,weareassuringthatapproximately63Koftheyieldstrengthofthematerialispreserved.Asaresult,whenweevaluatethestructuralmembersfor It~fl'.'Sl')8C)Aj.I,y.dyfi"~,-~)iAl" FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE6of28100ÃliveanddeadloadandusethenormalA.I.S.C.allowablestresses,weare,infact,satisfyingtheconditionswhichwouldbeimposedbyaloadingcombinationconsistentwiththefirescenario'.InSection3.2ofthisreport,'heEnergyBalanceMethodoutlinedinthepreviousrevisionhasbeenexpandedtoincludetheheatabsorptioncapabilityoftheconcrete.Inthedevelopmentofthemethodithasbeenassumedthatanequilibriumtemperatureisreachedbetweenthestructuralsteelandthefirstinchofdepthofconcrete.Theassumptionofequilibriumconcreteheatuptoadepthofoneinchisconsideredareasonableassumptionsinceinactualitytherapidtransferofheatthroughtheairwouldcauseamuchlargerareathanassumedtobeheatedup.Fromastructuralstandpointheatingofthelower1"ofconcretewillhaveanegligibleeffectontheconcretestructuralpropertiessincethecoveronthereinforcingsteelisapproximately4"andinthestructuralevaluationforslabspancapability,theconcreteontheundersideoftheslabisin,tension.Tensileconcreteisnotconsideredforstructuralproperties.Thefollowingcombustiblesweregenericallyevaluated,anditwasdeterminedthataspecificanalysisonacase-by-casebasiswasnotrequired.Theremainingcombustibleswhicharerepresentedsolelybycabletraysarethedominantfactorleadingtopotentialhightemperatures.whichwouldaffectstructuralsteel.3.1.1CombustibleLiuidsCombustibleliquidscouldpresentfireexposuretostructuralsteel.Themostprobablelocationforheatreleased,however,wouldbeatthefloorlevelandtheheatwouldbereleasedveryquickly.Theanalysisofallfirezonescontainingcombustibleliquids,exceptFireZonesI-1Gand2-1G,areboundedbytheanalysisofFireZoneI-1C.FireZoneI-1Ccontainsthelargestin-situquantityofoil(155gallons)inthesmallestroom(1374squarefeet).ThisoilisassociatedwiththeHPCIandRCICTurbines.TheSusquehannaSESFireProtectionReport(Rev.2),page4.1-2,indicateda4mmperminuteburningrateforoil.Assumingthein-situ155gallonsandatransientallowanceof155gallonsofoil.arespilledonthefloorandnoneoftheoilisremovedbythefloordrains,thecalculatedfirewilllastlessthanthreeminutes.Thisisnotsufficienttimeforthecriticalstructuralsteeltobeheatedto1000'F.TheHPCIturbinesandRCICturbinelubeoilsystemshaveamaximumoilflowof60gpmat110psi.Thepotentialforahighpressureleakaffectingthesteelislow.Thepiping FIREPROTECTIONPROGRAMOEVIATIONRE(VESTNO.6PAGE7of283.1.2isseismicallydesignedandautomaticopenheaddelugewaterspraysystemsprotecttheHPCIandRCIC.oilsystems.OilsumpslocatedinFireZoneI-1Gand2-1Ghavea1120galloncapacity;Theconstructionofthesesumps,however,wouldpreventtheignitionandburningoftheoil.ThesumpsareconstructedofasteellinercastintoconcretebelowtheReactorBuildingBasement.Thecoverofthesumpsisa14'hickconcreteslabwitha2'2k'anholeconstructedofaminimumof3/4"thicksteelplate.Charcoal3.1.3TheHVACunitswhich'containcharcoalareprovidedwithfixeddelugesystemsandarecontainedwithinsteelenclosures.Becauseofthephysicalconfigurationofthecharcoalbedsafirewillbeslowandsmolderingwithalowheatreleaserate.Therefore,theseunitswillnoteffectbuildingstructuralsteelintegrity.TransientCombustibles3.2TechnicalInvestigationsbySandiaLaboratories(Ref.8,Table3)indicatethattransientcombustiblesproducelowheatreleaseratesresultinginroomtemperaturesbelow500'F.Thepresenceoftransientcombustiblesisadministrativelycontrolledthroughoutthefacility.Whenpresenttransientcombustiblesarelocatedatfloorlevel.Iftransientcombustiblesareconsideredalongwithacabletray,itwouldbeexpected,basedontheabovereferencedSandiadata,thatthetransientwouldbeanignitionsourceonlyifthecabletraywasclosetothetransientcombustible.Suchacombinationofheatreleasecausedbycabletraysandtransientcombustiblesatfloorlevelwouldnoteffectstructuralsteellocated'attheceiling.Additionally,sincethestructuralsteeljustificationwasbasedon1000'Fcriticaltemperature,therestillremainsa300'Fallowancebeforetransientcombustibleswouldproducealocalhotspotof1300'F(1300'Fistheal.lowablelocalhotspottemperatureduringaNFPA251test).BasisThissectionofthereportprovidesthetechnicalbasisusedtoaddresstheeffectsofeachuniquecombustibleconfigurationontherequiredstructuralsteelmembers.

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE8of28ThebasicmethodologydevelopedinthissectionisreferredtoastheEnergyBalanceMethod.TheEnergyBalanceMethodprovidesameanstocalculatetheenergyreleasedfromagivencombustibleconfiguration,tocalculatetheenergyabsorptioncapabilityofagivenstructuralmassandtodeterminebycomparingthesetwocalculationswhetherornotthecriticaltemperaturecanbeexceeded.'sdiscussedbelow,theSandiaLaboratories'FireRetardantCoatingTest"(Ref.1)providesthedatanecessarytopredicttheenergyreleaseofacabletrayfire.TheSandiaLaboratories'FireProtectionResearchProgramCornerEffectsTests"Report(Ref.4)providesadditionaldatatoconfirmthesepredictionsandpredicttheheatreleaseeffectsoftheburningcablesasafunctionofthedistanceofthesecabletraysfromthecorner.Theheatreleasedatawithincreasingdistancefromthecornersuggeststhattheabilityofthecablestoburnandtheresultantenergyreleaseisgreatlydiminishedasthereradiationeffectstypicaloftheclosecornerrelationshipareremoved.Theenergyrelease,.figuresprovidedinthecornereffectstestsareusedtobaselinethevaluesmeasuredinthe"FireRetardantCoatingTests"andasaconservativepredictionoftheheatreleasevaluetobeusedinthemethodologyoutlinedbelow.EnerBalanceMethodEnerAbsortionTheenergyabsorptioncapabilityofagivenstructuralmasscanbecalculatedasfollows:ECT=ErxQwhere:Ec=thecriticalenergyneededtoheatallthecomponentsinagivenareatothecriticaltemperature(BTU)Er=Energyrequiredtoraiseaunitamountofagivencomponentfromambienttothecriticaltemperature.Q=Thetotalquantityofeachcomponentinthearea.Thetypicalcomponentsinagivenareawhichwouldbepresenttoabsorbheatarestructuralsteel,concrete,ductwork,piping,air,equipmentandeventhesteelcabletrayitself.Forpurposesofourevaluationonlystructuralsteelandconcretewillbeconsideredasheatabsorbingcomponents.

FIREPROTECTIONPROGRAMDEVIATIONRE(UESTNO.6PAGE9of28Theheatrequiredtoraisethetemperatureofonepoundofstructuralsteelto1000'Fcanbecalculatedbythefollowingequation:ErS=CpSx(Tc-To)where:(Eq.la)Er=Energyrequiredtoraisethetemperatureofofpoundofstructuralsteelfromambienttothecriticaltemperature(BTU/lb)Cp=Specificheatofsteel(Cp=.112BTU/lb'Fforsteel)STo=Pre-fireroomtemperature=100'FTc=Criticaltemperature'=1000'FInsertingthegivenvaluesintoequationlayields:Er=.112BTU(1000'F-100'F)=100.8BTU/lblb'FTherefore,approximately100BTUsperpoundofsteelarerequiredtoheatthesteeltothecriticaltemperature.Thecriticalenergyrequiredtoheatagivenstructuralmembertothecriticaltemperatureof1000Fisexpressedas:EcSErSxWxLwhere:(Eq.2a)Ec=Criticalenergyneededtoheatagivenstructural=steelmembertothecriticaltemperature(BTU)W=weightofstructuralsteelmemberperfoot(lb/ft)EL=lengthofstructuralsteelmembersubjectto'directenergyeffects(ft)Theheatrequiredtoraisethetemperatureofonesquarefootofconcrete1"deepto1000'Fcanbecalculatedbythefollowingequation:Er=Cpx(Tc-To)Ccwhere:(Eq.1b)ErC=Energyrequiredtoraisethetemperatureofonesquarefootofconcrete1"deepfromambientto=thecriticaltemperature(BTU/lb)

FIREPROTECTIONPROGRAMDEVIATIONRE(VESTNO.6PAGE10of28Cp=Specificheatofconcrete(Cp=.156BTU/lb'Fforconcrete)CTo=Pre-fireroomtemperature=100'FTc=Criticaltemperature=1000'FInsertingthegivenvaluesintoequationlbyields:Er==.156BTU(1458/ft3)(lft/12inch)(1000'F-100'F)=1696.5BTU/ft2IbFTherefore,approximately1700BTUspersquarefootofconcretearerequiredtoheattheconcretetothecriticaltemperature.Thecriticalenergyrequiredtoheatagivenconcreteareatothecriticaltemperatureof1000'Fisexpressedas:EcCrCxcWhere:(Eq.Zb)Ec=Criticalenergyneededtoheatagivenconcreteareatothecriticaltemperature(BTU)A=theeffectedconcreteareaCE~Theenergyreleasedfromacabletraycanbedevelopedasfollows:Theheatreleasedfromatwo-cabletrayfirecanbepredictedfromdatadevelopedduringSandiaLaboratoriesFireRetardantCoatingTests(Ref.1).Duringsmallscaletesting,Sandia(Ref.1,[ableA-XI)determinedthemayimumHeatReleaseRatetobe134KW/Mwhichisequalto11.8BTU/ftsec.Sandiaperformedafullscalefreeburntestoftwostacked18-inchwidecabletraysfilledwithIEEE383cable(Ref.1Test20).ThetotalheatreleasedfromthistestcanbepredictedbyconservativelyassumingtheSandiasmallscalemaximumheatreleaseratewasconstantduringtheentirefiretestburnperiod.Thisisexpressedas:Ht=HrxAtxTHt=Totalheatreleased(BTU)Hr.=Maximumheatreleaserate(BTU/ft'ec)At=Areaofcabletrayburned(ft~)T=BurnTime(sec)(Eq.3)

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGEllof28Inthistest,thebottomtraywasdamagedfor24linearinchesandburned9minutes.Thetoptraywasdamagedfor54linearinchesandburnedfor12minutes.Usingthisdatainequation3yields:HeatReleaseTopTray=11.8BTUx18inx54inxsecft~144sqin/ft~=57,348BTU12min1min/60secHeatReleaseBottomTray=11.8BTUx18inx24inx9Minsecft'44sqin/ft~1min/60sec=19,116BTUTotalHeatRelease(Ht)=57,348+19,116=76,464BTUThemaximumtotalheatreleaseperareacanbeexpressedasfollows:Hmax=Ht/At(Eq.4)where:Hmax=Maximumtotalheatreleaseperarea(BTU/ft)2Substitutingourpreviouslydevelopeddataintoequation4yields:Hmax=76,464BTUinin+24in=7842BTU/ft'4,int~Thismaximumtotalheatreleaseperareacanthenbeappliedtootherconfigurationsbythefollowingequation:H'HmaxxA'here:{Eq.5)H'Predictedheatreleaseforagivenconfiguration(BTU)A'Areaofcabletrayburnedforthatgivenconfiguration(ft)SandiaLaboratoriesalsoconductedseparatecornereffectstestsofcabletrays(Ref.4)wherecalorimetersrecordedheatfluxabovethecabletrayfires.Thisadditionaltestseriescanbeusedtoconfirmthepredictedmaximumheatreleasevalueof7842BTU/ftandalsotodeterminethemaximumheatreleasevaluesforconfigurationswithdifferentcornerconfigurations.

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE12of28Thecornereffecttestdatawasobtainedduringfullscalefreeburnfiretestsinacornerconfiguration.Thecabletraytype,arrangement,fillandcontentsweresimilartothefireretardantcoatingtestsarrangement.Duringthesecornerteststheactualmaximumheatflux(heatreleaserate)wasmeasuredbydeterminingtheheatreleasedirectlyabovethecabletraywiththecable-traylocatedatvariousdistancesfromthecorner(Ref.5-TableIandII).Themaximumheatfluxmultipliedbyburntimewouldconservativelyindicatethetotalheatattheuppercalorimeterasfollows:Hmax=HfxT(Eq.6)Where:Hf=maximumheatflux(BTU/fthr)2Bysubstitutingthedatafromtheactualcornerteststhefollowingdatacanbegenerated:CableTray*MaxHeatFluxDistance(Hf)-fromCornerBTU/ft'hr5inx10.5in18,43010.5inx18in12,33060inx.120in2,370*(SeeFigure2.0)BurnTime(T)~min202425MaxHeatRelease/Area(Hmax)~BTU/ft~6140BTlf/ft~4932BTU/ft2987BTU/ftThe6140BTU/ftiscomparabletothe7842BTU/ftderivedfromthe22fireretardantcoatingtestdata.Thisisexpected,becauseattheshortcornerdistancethepredictedheatreleasewouldnearlyequalthemeasuredmaximumheatrelease.UsingthisdevelopeddataandtheresultsoftheSandiaCornerEffectsTest(Ref.4),adeterminationcanbemadeastotheamountofheattransferredtothestructuralcomponentsinanareaduetoafire,inacabletraylocatedsomedistancebelowthesteelmember.Ithasbeendeterminedthat7842BTU/ft~isthemaximumheatreleasedatthecabletrayorgroupofcabletrays.Figure1.0ofthisreportisareproductionofFigure7fromtheSandiacornereffectstest(Ref.4).Thedatainthisfigurecanbeusedtodeterminethemaximumheatreleasevaluesasafunctionofcornerconfiguration.AccetanceCriteriaTheenergyrequiredtoheatagivenstructuralmassto1000'Fiscomparedwiththeenergyreleasedbyafireinthevicinityofthat p,T FIREPROTECTIONPROGRAMOEVIATIONRE(UESTNO.6PAGE13of28masstodeterminewhetherornotthefirethreatensstructuralintegrity.Ifthefollowingratioissatisfied,structuralinte'gritywillbeassured:EcO1.0H'Eq.7)where(aspreviouslydefined)Ec=Thecriticalenergyneededtoheatallthecomponentsinagivenareatothecriticaltemperature(BTU).O'Predictedheatreleaseforagivenconfiguration(BTU).ConservatismsThefollowingdemonstratesthattheUseofthistechnicalbasisatSusquehannaisconservative:oThemaximumheatre'leaseratesusedinouranalysiswerebasedoncabletraytestconductedbySandia(Ref.4).InthesetestscrosslinkedPE(polyethylene)cablesina'loosepackedconfigurationweretested.EPRIconductedaseriesoffullscalefiretestsusingthefollowingcabletypesandpackingarrangements:-Tightlypackedethylenepropylenerubber(EPR)/hypaloncables-Looselypackedethylenepropylenerubber(EPR)/hypaloncables-TightlypackedPEcables-LooselypackedPEcablesTheresultsoftheEPRItestdemonstratedthefollowingrelationships.-Thetighterthecablepacking,thelowertheheatreleasewillbe.-TheEPR/hypaloncableshavealowerheatreleasethanthePEcables.SinceSusquehannaSESusedEPR/hypaloncablesinatightpackedarrangement,thequantativetestdataindicatesthattheuseof FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE14of28theheatreleasedatafromtheSandiatesthasaninherentfactorofsafetyofapproximately8whenappliedtoourplant.oTheSandiaobservedmaximumheatreleaseratedata(Ref.1,4)wasassumedovertheentireburntime.Duringanactualfire,theheatreleaseratewouldgraduallyincreasetothemaximumandthendecrease.oAllcabletrayswereassumedtobefull.oHeattransfertotheroomairwasignored.oSteelwasassumedtofailifthe1000'Fcriticaltemperaturewasreached.Thereducedloadcapabilitiesofthestructuralsteelattemperaturesabove1000'Fwereignored.oItwasassumedthathighfiretemperaturesexistedforsufficienttimetoallowheatingofthesteel.Inmanycasesthelongerheatingintervalsrequiredforthelargerstructuralsteelmemberswillnotexistforsufficienttimetoallowthenecessaryheattransfer.3.3TwoHorizontalCableTraCriteria3.3.1Descrition3.3.23.3.3Allrequiredstructuralsteelframingmemberswerereviewed.Anymemberaffectedbyacombustibleconfigurationcomprisedof,nomorethantwo(2)horizontalperpendicularcabletrayswithnoother*cabletrayswithinafour(4)footdistanceandnotlessthanonefootbelowthestructuralsteelweredeterminedtobeacceptable.(SeeFigure3.0.)~AroachTheEnergyBalanceMethodwillbeusedtoprovideajustificationforthecriteriabydemonstratingthatthiscombustibleconfigurationwillnotcausetemperaturesabove1000'Fforthelightestmembertowhichthecriteriawasapplied.JustificationThefollowingjustificationisprovidedtoquantitativelydemonstratethatthecombustibleeffectsfromtwo(2)horizontalperpendicularcabletraysonefootbelowthestructuralsteelareinsufficienttocauseastructuralsteelmembertobeheatedto1000'F.(SeeFigure3.0.)

FIREPROTECTIONPROGRAMDEVIATIONRE(UESTNO.6PAGE15of28Therefore,anystructuralsteelmemberlargerthanthatmemberjustifiedisacceptableforthedescribedcombustibleconfiguration,becauselargerquantitiesofheatarerequiredtoheatlargersteelmembers.ThelighteststructuralsteelmembertowhichthiscriteriawasappliedisaW21x49.Therefore,aM21x49beam(flangewidth-6.52in,weight-49lb/ft)andtwo24-inwidecabletraysmustbejustified.Enerreleasedatthecabletra:.FromFigure3.0itcanbeseenthatthecabletrayis33"belowtheceiling.Usingavalueof9500BTU/ft~-HRforadistancefromtheceilingof30"fromFigure1.0andusing25minutes,thelongestburntime,fromthetableonpage10,calculateHmaxforthisconfiguration.Since:H=HxAxtrandHmax=Ht/AtTherefore:(Eq.3)(Eq.4)Hmax=Hxt=9500BTUx25min.x1Hrft'-Hr60min.Hmax=3,958BTU~ftH'3,950BTUx24inx6.52inx2trays(Eq.5)Ttt12in/7t12in/ftH'8,602BTUEnerreuiredtoheatbeamto1000'F:Ec=49lbsx24inx100BTU=9,800BTU(Eq.2)ft12in/ftlb FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE16of28Ratioenerreuiredtoenerreleased:9,800BTU=1.14+1.08,6t62U(Eq.7)Therefore,thecriteriaisjustified.Thisjustificationassumesthatthemaximumheatreleaserateoftheburningcabletrayconfigurationisafunctionofthedistanceofthecabletrayfromtheceilingratherthanfromtheundersideofthestructuralsteelmember.Thisisacceptablebecauseallpartsofthecabletrayareatleast33"fromtheceilingexceptforashort,6.5",sectionbeneaththestructuralsteelmember.Itisunrealistictoassumethatthecornereffectswilldramaticallyincreaseinthisshortdistance.Thisjustificationalsoassumesthatonlytheportionofthecabletraydirectlybeneaththestructuralsteelmembercontributestoraisingthetemperatureofthe'steel.Thisisjustifiedbecausethoseportionsofcabletraynotdirectlyunderthesteelwillcauseheat-upofthereinforcedconcreteslababovethem.Foreachadditionalfootofcabletrayconsidered7,916BTU'sisrel,eased.Assuminga45'istributionofthisheatintotheconcreteslab,theadditionalheatabsorbtionaffordedbytheconcrete,usingthemethodologyoutlinedinSection3.2,is12,750BTU's.Therefore,moreenergyabsorptioncapabilityisaddedthanadditionalheatreleased.3.4NPFA13SrinklerCriteria3.4.1Descrition3.4.2TheUnit1andUnit2ReactorBuildingsbothhaveareaswithautomaticsprinklerprotectiondesigned,installedandtestedtotherequirementsofNFPA13.AllrequiredstructuralsteelframingmembersinareasprotectedbyNFPA13sprinklersystemsandhavingcombustibleconfigurationslessthanthosejustifiedhereinweredeterminedtobeacceptable.'A~roachForagivenquantityofcabletrays,anautomaticsprinklersystemiscapableofpreventingstructuralsteeldamagebycontrollingafireandcoolingthesteel.Sixcabletrayshavebeenselectedasbeingacombustibleconfigurationwhichcanbeprotectedbyasprinklersystem.Branch FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE17of28TechnicalPositionCMEB9.5-1(Rev.2)lendscredencetothiscriteriainthatitrequiresautomaticsuppressionsystemsonlywhenanareacontainsmorethansixcabletrays.Additionally,extensivelargescalefiretestingofrackstoragearrangements,afarmorehazardouscombustibleconfigurationthancabletray,havedemonstratethatceilinglevelautomaticsprinklersinstalledinaccordancewithNFPA13areeffectiveinpreventingheatdamagetounprotectedsteelbeamsandcolumns.TherequirementsofNFPAStandard231C,"StandardforRackStorageofMaterials",(Ref.4)weredevelopedbasedontheresultsoftheselargescaletests.Acomparisonbetweenthecombustibleconfigurationsandfirehazardsassociatedwithrackstorageandcabletrayswillbeusedtojustifyourcriteria.JustificationOurcriteriacanbejustifiedbycomparingtherelativefirehazardofasix-cable-trayfirewiththatofthe.rackstoragefirewhichmeetstheNFPAStandard231Crequirementsanddoesnotrequirestructuralsteelprotection.Rackstorageofmaterials,especiallymostplasticmaterials,presentsadifficulttocontrolfirehazard.Thematerialsandthecardboardpackagingholdingthesematerialsareeasilyignited.Onceignited,therackstorageconfigurationprovidesidealconditionsforrapidandintensecombustion.Intherackstorageconfigurationtheboxesofmaterialsaresurroundedonallsidesbysufficientoxygenforcombustion,andthefluespacescreatedbetweenadjacentboxesareidealforreradiationeffectswhichpromotefirespread.Also,thepalletizedmaterials(4'4').presentlargeareasofblockagefromsprinklerprotectionandallowfiregrowthtoalevelwhich,canoverpowertraditionalsprinklersystems.Recognitionoftheseconditionsledtoextensivelargescalefiretests.ThesetestsservedasthebasisfortheNationalFireProtectionAssociations's"StandardforRackStorageofMaterials"(NFPA231C)(Ref.4).TherackstoragetestprogramandNFPAstandardclearlyshowthatwhenanadequatelydesignedceilingsprinklersystemisinstalled,fireproofingisnotrequiredforsteelcolumnsorceilingsteel.(Ref.4Sec.3-2.1,3-2.3,B 2.1,andB 2.3.)Incontrast,thecabletraysatSusquehannacontainIEEE383qualifiedcableswhichrequireatleast70,000BTU/hr FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE18of28heatinputtoignitethecables.Duetothetightpackingofcablesincabletrays,thereisonlylimitedexposuretoair.Cabletrayfiresareslowdevelopingrelativetocardboardpackagingmaterials,andunlikeotherfuelarrays,cabletrayspresentafuelarrangementwhichallowsfirepropagationinonlytwodirections.Finally,thecabletrayitselfisconstructedofnon-combustiblesteel.IntheReactorBuildingsthepredominantfirespreadisverticallyfromtraytotray.Horizontalfirespreadfromcabletraytocabletrayispossible,butthemajorityofthecabletraysintheReactorBuildingarearrangedwithspacingwhicharenotidealforhorizontalfirespread.Thefollowingexampleshowshowtodeterminetherequiredceilingsprinklersystemparametersforahighhazardrackstorageconfigurationwhenstructuralsteelfireproofingisnotprovidedoneitherceilingbeamsorcolumns.NFPA231CSrinklerDesinExamleThefollowingexampleusesNFPA231Crequirementstodeterminesprinklersystemparametersforagivenrackstoragecombustibleconfigurationwhenstructuralsteelfireproofingisnottobeused.a.ProblemDefinition-Determinethesprinklerdensityforaceilingsprinklersystemcapableofmaintainingthebuilding'sstructuralintegrityforthefollowingrackstorageconfiguration.1)Thestoredmaterialispalletizedcardboardcartonscontainingfoamedpolystyrene.Thepalletsandcartonsarenotencapsulatedwithplastic.2)Theaislespacingis8feet.Therackstorageheightis15feet.3)Therearenoin-racksprinklers.4)Structuralsteelceilingbeamsandcolumnsarenotfireproofed.b.NFPA231CRequirements1)ThecombustiblematerialdescribedabovewouldbeclassifiedasaClassIVcommodityperNFPA231CSection2-1.1.4.

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE19of282)ByreferringtoTable6-11.IinNFPA231Candapplyingthefollowingconditions:i)Therackstorageheightisover12feetbutlessthan20feet.iii)ThecombustiblematerialisclassifiedasaClassIVcommodity.hThepalletsandcartonsarenotencapsulatedwithplastic.iv)An8-footwideaisleisusedbetweenrackconfigurations.v)Noin-racksprinklersareprovided.itcanbedeterminedthatFigure6-8.2canbeusedtodeterminetheallowablereductionfactortobeappliedtothesprinklerdesigndensityandthatFigure6-11.ldcurveEorFistobeusedtodeterminetheunfactoredsprinklerdesigndensity.(RefertoNFPA231Cforfigures.)3)UsingNFPA231CTable6-8.2,itisdeterminedthata60%reductionfactormaybeappliedtotherequiredsprink'terdesigndensitydeterminedbelow.4)NFPA231CTable6-ll.dcurveFwillbeused,becauseSusquehannaSESuses212'Fratedsprinklerheads.CurveFappliesto165'Fratedheads.CurveEappliesto265'Fratedheads.Usingthecurveforthelowerratedheadsresultsinamoreconservativesprinklerdensity.Using2500squarefeet,whichwasusedasthedesignareaforsprinklercoverageusedinthedesignoftheSSESReactorBuildings,itcanbedeterminedthattherequiredsprinklerdesigndensityforthisrackstorageexampleis:2RequiredSprinklerDesignDensity=.54GPM/ft5)Byapplyingthe60%reductionfactordeterminedinstep3above,thefinalsprinklerdensityisdeterminedtobe:SprinklerDensity=.54x.60=0.32GPM/ft'

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE20of28C.6)TherequirementsofNFPA231C'sections3-2.1and3-2.3aresatisfiedbythestorageheightlimitationsof15feetandthesprinklerdesignwhichconformstoChapters6.7.8and9.Therefore,fireproofingofstructuralsteelbeamandcolumnsisnotrequiredforthisexample.ConclusionAceilingsprinklersystemwithadesigndensityof.32GPM/ft2over2500squarefeetisconsideredsufficienttoprotectnon-fireproofedstructuralsteel(ceiling.beamsandcolumns)fromdamagewhensubjectedtoarackstoragehazardwiththeaboveparameters.ComarisonofOurCableTraCriteriaWiththeFireHazardoteactoraexamea~CableTraysCabletrayspresentanimportantfireprotectionchallengetocontroldamagepriortoaffectingsafeshutdownorstationavailability,butcabletrayfireshavelowheatreleaserates,spreadslowly,anddonotposethedan'gertostructuresthattherackstoragematerialsdo.b)AsdiscussedinSection3.2ofthisreport,theSandiaLaboratoriesFireRetardantCableTest(Ref.1)TableA-Kjindicatesamaximumof11.8BTU/ftasec(136,690W/M)fornon-coatedelectricalcables.Therefore,itcanbeconcludedthatthetotalheatreleaserateforsixcabletrayswouldbe70.8BTU/ft2sec.RackStorageRackstoragestorescombustiblematerialsinconfigurativeidealforcombustion(i.e.,airspacearoundfuel,anddistancesidealforradiantheattransfer).Therefore,rackstoragepresentsanextremelydifficultfiretocontrol.Rackstoragefireshaveextremelyhighheatreleaserates,spreadveryquickly,andcanthreatenstructuralintegritywithinminutesunlesspropersprinklerprotectionisprovided.HeatreleaseratedatafortherackstoragecommoditywasobtainedfromFactoryMutualData(Ref.10,Table2,Page26)whichindicatesthatapalletofpolystyreneincartons14to15feethighhasanaverageheatreleaserateof300BTU/ft2sec.

u FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE21of28c)Asaresultoftheinformationinaandbabove,thefollowingdatacomparisonofcriticalfireprotectionparameterscanbepresented.DATACOMPARISONHazarHeatReeaseateSprinklerDensity0.8BUtsec300BUtsec.15GPN/ft~*.32GPN/ft~aeTrayr>terraRacStoragexampe*SSESwasesignedonteasisofa.15GPN/ft'prinerdensityovera2500sqftarea.d.ConclusionThedominantmechanismgoverningasprinklersystem'sabilitytoextinguishfiresandalsotoprotectstructuralsteelfromdamageistheabilityofthesprayedwatertoabsorbtheheatreleasedfromthefire.Thisabsorptionoccursastheheatofthefireisusedtochangeliquidwatertosteam.Theheatreleaseratesofdifferentmaterialsastheyareconsumedisanindicationoftherelativefirehazardofthedifferentfires.Astheheatreleaserateincreases,largerandlargerquantitiesofwaterarenecessarytoabsorbthehigherheatlevelsgenerated.Therefore,acomparisonofthedatapresentedinItemcaboveonheatreleaseratesandsprinklerdensitiescanbeusedindemonstratingtheadequacyoftheSusquehannasprinklerdesignforourcabletrayconfigurations.Sincetherackstorageexampleaboveprovedthata.32GPM/ft~densitysprinklersystemcouldcontrolafirewithaheatreleaserateof300BTU/ft~min,usingastrictlylinearrelationshipwecanpredicta.15GPN/ft~densitysprinklersystemwouldcontrolafirewithaheatreleaserateof140BTU/ft~secor12cabletrays(140BTU/ft'ecdividedby11.8BTU/ft'ecpercabletray).Theassumptionoflinearityappliedabovewouldbeviewedasbeinghighlyunconservativeifthelighthazardfiretestdatawasusedtopredictthesprinklersystemrequirementstoprotecta A,

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE22of28configurationwithhighfirehazardpotential.Thisisvalidbecauseasthelevelofthecombustiblesdoubles,effectssuchasreradiationcanhaveanexponentialeffect.Incontrast,however,toextrapolateresultsfromthehigherdensitysystemtothelowerdensitysystemonalinearbasisisclearlyaconservativeandsupportableapproach.Whilethiscomparisonpredictsawidemarginofsafetyoverthesix-traycriteria,thecriteriawaslimitedtosixcabletraystobeconservative,toparalleltheBranchTechnicalPositionCNEB9.5-1(Rev.2)requirements,andtoassurethatspecificorientationsandarrangementsexceedingthecriteriawouldbelookedatonacase-by-casebasistoensuretheadequacyofthesprinklersystem.Therefore,theexistingceilinglevelautomaticsprinklersystemintheSusquehannaSESReactorBuildingcanbeexpectedtoprotectstructuralsteelwithawidemarginofsafetyintheeventofafireinvolvingsixcabletrays.3.5Case CaseFireProtectionAnalsis3.5.1Descrition4.0RESULTSForallrequiredstructural.steelframingmembersnotsatisfyingeitherofthetwocriteriaoutlinedaboveoneofthefollowingapproacheswasusedtojustifythatstructuralsteelfireproofin'gwasnotrequired:a)Fornon-sprinkleredareas,acase-by-caseevaluationusingtheEnergyBalancemethodoutlinedinSection3.1ofthisreportwasperformed.Themostseverecabletrayexposure'asanalyzedforeachsteelmemberevaluated.Incaseswherethem'ostsevereexposurewasnotobvious,severalexposureswereevaluated.b)Forsprinkleredareas,acase-by-caseevaluationtodeterminethattheexistingcombustibleconfigurationwouldbecontrolledbythesprinklersystemwasperformed.AllstructuralsteelintheUnitk'1and82ReactorBuildingswasreviewedinconjunctionwiththecombustibleconfigurationexposingthestructuralsteeltodetermineifthecombustibleconfigurationwouldcausestructuralsteeltemperaturesinexcessofthecriticaltemperature.

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE23of28Nosituationswerefoundwheretheadditionoffireproofingmaterialswasdeterminedtobenecessarytokeepstructuresteeltemperaturesbelowthecriticaltemperature.Forareasactingasfireareabarriers:a)ThestructuralsteelsupportingtheroofoftheReactorBuildingswitchgearrooms(FireZone1-4C,1-4D,1-5F,1-5G,2-4C,2-4D,2-5Fand2-5G)wereconfirmedtoalreadybeprovidedwith3-hourfireratedfireproofing(Thesearenotthesubjectofdeviationrequest¹6).b)Thespecificcombustibleconfigurationsandjustificationsforeachoftheremaining-fireratedareasiscontainedinDeviationRequest¹6,Non-FireproofedStructuralSteel.5.0MODIFICATIONSNomodificationsarerequired.6.0ScheduleScheduledataformodificationsisnotapplicable.Nomodificationswereidentifiedbythisanalysis.7.0ComensatorMeasuresCompensatorymeasuresarenotapplicable.Nodeficiencieswereidentifiedbythisanalysis.8.0ConclusionTheevaluationofthestructuralsteelintheSusquehannaSteamElectricStationUnit¹1and¹2ReactorBuildingshasdetermined,basedontheconservativeevaluationcriteriaoutlinedinthisreport,nottorequirestructuralsteelfireproofing.Withtheseresults,assummarizedinDeviationRequest¹6,Non-FireproofedStructuralSteel,allstructuralsteelisjustified.tg/i327i:clb FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE24of28APPENDIXAFIGURES

2400011<X<140Z16000O'2000h9Soo800000H=1.09X10+2.1X10X-8.47X10UNQUALIFIEDCABLEH=152+3.06X10X-1.09X10IEEE-383QUALIFIEDCABLE45607590105120135150INCHES,XFIGURE1.0(FromFigure7oftheSandiaCornerEffectsTest-Ref-4)OCTTl~ms-eg)(XlUVlcc%OO0m~A~m~Q)~~C'Om~C/)URODA~X7Ch&

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE26of280f~44P~iyll~~~p~ao'i'g~,L~00,ayiy4q0...CA.f6'7FA'(ARRh,dcqKhh647.

FIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE27of280~t~4p~'IoOrnerarr4Os@~lrCX9g~40%~0~e>oC,O~'IIoroCiV'C~rs4CA,eLKTa+gS~AuETa+y.4g"NlohTRAQView"A-A

'w APPENDIXBREFERENCESFIREPROTECTIONPROGRAMDEVIATIONREQUESTNO.6PAGE28of281.SandiaFireRetardantCoatingTest12 77to1-31-78Sand78-05182.NFPACode251-StandardMethodsofFireTestsofBuilding,ConstructionMaterials1985Edition3.NFPACode231C-RackStorageof-Materials1980Edition4.SandiaFireProtectionResearchProgramCornerEffectsTests-Sand79-0966'.CategorizationofCableFlammabilityIntermediateScaleFireTests'ofCableTrayInstallations-EPRINP-1881,August1982.6.NRC'sBranchTechnicalPositionCMEP9.5-1(Rev..2).7.SandiaInvestigationofTwenty-FootSeparationDistanceasaFireProtectionMethodasSpecifiedin10CFR50,AppendixRSAND83-0306.8.ManualofSteelConstruction-8theditionAISC,Inc.9.VendorDrawingM-343layoutdrawingandhydrauliccalculations.10.EvaluatingUpsprinkleredFireHazards,AlpertandWard,FactorMutualResearch(RC84-Bt-9).11.FireProtectionReviewReport(Rev.2)Susquehanna,SteamElectricStation.12.ChemicalEngineers'andbook-4thedition,J.H.Perry.13.BuildingCodeRequirementsforReinforcedConcrete,ACI318-83.

,

UNIT1FIRERATEDFLOORSLABABOVEFIRE~ZONE1-1FReferenceDrawingC-206006,Sheet1Thefireratedfloorslabinquestionis2'-9"thickandthetopofslabisatelevation683'-0".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thesourceofcombustiblesinthisareaistwohorizontalcabletrayslocatedapproximately12'eneaththebottomofthestructuralsteelbeams.Evaluation:Section3.3oftheSummaryReportforStructuralSteelEvaluationprovidesjustificationfortheadequacyofstructuralsteelforacombustibleconfigurationoftwohorizontallystackedcabletrays.Thetwocabletraysinthisfirezonearelocatedapproximately12'eneaththebottomofthestructuralsteelbeamswhereasthecabletraysdiscussedinSection3.3ofthereportareonlyonefootbelowthesteelbeams.ThisincreaseddistanceaddstothemarginofsafetyalreadycontainedintheSection3.3analysis.Conclusion:ThefireratedfloorslababoveFireZone1-1FasshownonDrawingC-206006,Sheet1,willnotbeadverselyaffectedbyafireinFireZone1-1FsinceapostulatedfireinFireZone1-1Fwouldnotgeneratesufficientheattoweakenthestructuralsteelbeamssupportingthefireratedfloorslab.fm/i395i:dek UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-6AReferenceDrawingC-206016,Sht.1DESCRIPTION:Thefireratedfloorslabinquestionis1'-9"thickandthetopofslabisatelevation779'-1".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thesourceofcombustiblesin,thisareais3horizontalcabletraysstackedontopofeachother.EVALUATION:'Theareadirectlybeneaththeportionofthefloorslabwhichisfireratedhasnocabletrays,however,3horizontallystackedcabletraysarelocatedbeneaththeW30X190structuralsteelbeamswhichsupporttheareafloorslabatelevation799'-1".ThesestructuralsteelbeamswereevaluatedbytheEnergyBalanceMethoddescribedinSection3.2of'theSummaryReportforStructuralSteelEvaluation.ThisanalysisdemonstratedthattheratioofthecriticalenergyneededtoheateachW30X190structuralsteelbeamtothecriticaltemperature(Ec)tothepredictedheatreleaseforthecombustibleconfigurationsurroundineachbeam(H')tobegreaterthantherequiredminimumvalueof1.0.Tisanalysisverifiestheintegrityoftherequiredstructuralsteelbeamssupportingthefireratedfloorslabinquestion.CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththisfireratedfloorslabasshownonthereferencedrawing,apostulatedfireinFireZone2-6Awouldnotgeneratesufficientheattoweakenthestructuralsteelbeamssupportingthefireratedfloorslab.fm/j092i:mab S

UNIT2FIRERATEDFLOORSLABABOVEFIREZONES2-4A-WAND2-4A-SReferenceDrawingC-206013,Sheet4ThefireratedfloorslabinquestionisI'-9"thickandthetopoftheslabisatelevation749'-I".Thisreinforcedconcreteslabactscompositelywithaseriesofstructuralsteelbeams=tosupportthisfloorelevationasshownonthereferencedrawing.Thesourceofcombustiblesinthisareaistwohorizontalcabletrays.Evaluation:TheportionsofFireZones2-4A-Wand2-4A-SlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireintheseportionsofFireZones2-4A-Wand2-4A-S,actuationoftheautomaticsprinklersystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthisfireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i455i:mab UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-4A-WReferenceDrawingC-206013,Sheets283Thefireratedfloorslabinquestionis1'-9"thicke'astofcolumnlineTand3'-3"thickwestofcolumnlineT.Thetopofslabelevationfortheentireslabisatelevation749'-1".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.ThecombustiblesinFireZone2-4A-Wlocatedbeneaththisfireratedfloorslabconsistofthreehorizontalcabletraysasdepictedonthereferencedrawing.Evaluation:TheentiresectionofFireZone2-4A-Wlocatedbeneaththe,fireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireinthisportionofFireZone2-4A-W,actuationoftheautomaticfiresuppressionsprinklersystemwouldmitigatetheheateffectsonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSectioq3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexist'ingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i399i:dek UNIT2FIRERATEDFLOORSLABABOVEFIREZONES2-4A-SAND2-4A-WReferenceDrawingC-206013,Sheet1ThefireratedfloorslabinquestionisI'-9"thickandthetop.ofslabisatelevation749'-I".Thisreinforcedconcreteslabactscompositelywiththestructural'teelbeamstosupportthiselevationasshownonthereferencedrawing.ThecombustiblesinFireZone2-4A-Sand2-4A-Wlocatedbeneaththisfireratedfloorslabconsistoftwohorizontalcabletraysstackedontopofeachotherasshownonthereferencedrawing.Evaluation:TheentiresectionofFireZones2-4A-Sand2-4A-Wlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomatic,firesuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireintheseportionsofFireZones2-4A-Wand2-4A-S,actuationoftheautomatic'firesuppressionsprinklersystemwouldmitigatetheheateffectofthefireonthestructuralsteelbeamssupportingthisfireratedfloorslab.'hebasisforthisevaluationispresentedin-Section3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesjustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.IConclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i397i:dek UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-3B-WReferenceDrawingC-206022,Sht.2DESCRIPTION:Thefireratedfloorslabinquestionis2'-3"thickwiththetopofslabatelevation719'-I".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamswhichsupportthisfloorelevation.Thesourceofcombustiblesinthisareaiscabletrays.EVALUATION:TheportionofFireZoneI-3B-WlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.'IntheeventofafireinthisportionofFireZone,2-3B-W,actuationoftheautomaticsprinkler'ystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportfor'tructuralsteelevaluation.ThissectionofthereportprovidesthejustificationfortheNFPA-13sprinklersystem'sheatabsorptioncapabilitywithregardstocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanb'eexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/j075i:mab UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-3B-WReferenceDrawingC-206022,Sht.IDESCRIPTION:Thefireratedfloorslabinquestionis2'-3"thickwiththetopofslabatelevation719'-I".Thisreinforced'concreteslabactscompositelywiththestructural-steelbeams'hichsupportthisfloorelevation.Thesourceofcombustiblesinthisareaiscabletrays.EVALUATION:TheportionofFireZoneI-38-WlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireinthisportionofFireZone2-3B-W,actuationoftheautomaticsprinklersystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4ofthe,SummaryReportforstructuralsteelevaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafety-intheeventofapostulatedfireinthisarea.fm/j074i:mab UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-3B-NReferenceDrawingC-206012,SheetsIand2Thefireratedfloorslabinquestionis4'-9"thickandthe.topofslabisatelevation719'-I".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.TheprimarysourceofcombustiblesinFireZone2-38-Nlocatedbeneaththefireratedfloorslabconsistofanumberofhorizontalandverticalcabletrays.Thelocationofthesecabletraysareshownonthereferencedrawing.Evaluation:TheentiresectionofFireZone2-3B-Nlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewith,NFPA13.IntheeventofafireinthisportionofFireZone2-3B-N,actuationoftheautomaticfiresuppressionsprinklersystemwouldmitigatetheheateffectsofthefireonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginof,safetyintheeventofapostulatedfireinthisarea.fm/i398i:dek UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-1EReferenceDrawingC-206011,Sheet2Thefireratedfloorslabinquestionis2'-9"thickandthetopofslabisatelevation683'-0".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.TherearenocabletraysinFireZone2-1Elocatedbeneaththisfirerated-floorslab.EvaluationWithnocabletrayslocatedbeneaththisfireratedfloorslab,sufficientheattoadverselyaffectthefireratedfloorslabwouldnotbegenerated.Section3.3oftheSummaryReportforStructuralSteelEvaluationprovidesjustificationfortheadequacyofstructuralsteelforacombustibleconfigurationoftwohorizontallystackedcabletrays.Thisareahasnocabletrays.Conclusion:ThefireratedfloorslababoveFireZone2-1EasshownonDrawingC-206011,Sheet2,willnotbeadverselyaffectedbyafireinFireZone2-lEsinceapostulatedfireinFireZone2-1Ewouldnotgeneratesufficientheattoweakenthestructuralsteelbeamssupportingthefireratedfloorslab.fm/i415i:dek UNIT1FIRERATEDFLOORSL'ABABOVEFIREZONE1-4GReferenceDrawingC-206009,Sheets182Descrition:Thefireratedslabinquestionis1' 1/2"thickwiththetopofslabatelevation761'-10".Thisslabactscompositelywithaseriesofstructuralsteelbeamsasshownonthereferencedrawing.Thesourceofcombustiblesbeneaththefireratedslabconsistoftwocabletrayswhichvaryinelevationbutarenocloserthan18'romthebottomofthefloorslab.Evaluation:Section3.3oftheSummaryReportforStructuralSteelEvaluationprovidesjustificationthattwohorizontallystackedcabletrayswillnotadverselyaffecttheintegrityofthestructuralsteelbeams.Thetwocabletraysinthisfirezonearelocatedapproximately16'elowtheoverheadstructuralsteelbeamswhereasthecabletraysdiscussedinSection3.3ofthereportareonlyonefootbelowthesteelbeams.ThisincreaseddistanceaddstothemarginofsafetyalreadycontainedintheSection3.3analysis.Furthermore,ananalysisusingtheEnergyBalanceMethodasdevelopedinSection3.2oftheSummaryReportshowedtheratioofthecriticalenergyneededtoheattheminimumrequiredstructuralsteelmemberstothecriticaltemperature(Ec)to'thepredictedheatreleaseforthiscombustibleconfiguration(H')tobeII.4whichismuchgreaterthantherequiredminimumvalueof1.0.Thisanalysissubstantiatestheintegrityofthestructuralsteelbeamsabovethiscombustibleconfiguration.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,thestructuralsteelbeamssupportingelevation761'-10"'boveFireZone1-4Gwillnotbeadverselyaffectedastheresultofapostulatedfireinthisarea.fm/i394i:dek

UNIT1FIRERATEDFLOORSLABABOVEFIREZONES1-4A-WAND1-4A-SReferenceDrawingC-206008,Sht.4DESCRIPTION:Thefireratedfloorslabinquestionis1'-9"thickwiththetopofslabatelevation749'-1".Thisreinforcedconcretefloorslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thesourceofcombustiblesbeneaththisfireratedfloorslabistwoverticalcabletrayswhichareseparatedfromeachotherbyapproximately20'.EVALUATION:TheportionsofFireZones1-4A-Wand1-4A-SlocatedbeneaththefireratedfloorslabinquestionareprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireintheseportionsofFireZones1-4A-Wand1-4A-S,actuationoftheautomaticfiresuppressionsprinklersystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslabsystem.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforstructuralsteelevaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.Thecombustibleconfigurationbeneaththisfireratedfloorslab'isboundedbytheanalysisinSection3.4.CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i447i:mab

UNIT1FIRERATEDFLOORSLABABOVEFIREZONES1-4A-MAND1-4A-NReferenceDrawingC-206008,Sheet2Descrition:Thefireratedfloorslabinquestionis1'-9"thickandthetopoftheslabisatelevation'749'-1".Thisreinforcedconcreteslabactscompositelywithaseriesofstructuralsteelbeamstosupportthisfloorelevationasshownonthereferencedrawing.Theprimarysourceofcombustiblesinthisareaistwocabletraysspacedapproximately12'romeachother.Evaluation:TheportionofFireZones1-4A-Mand1-4A-NlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireinthisportionofFireZones1-4A-Mand1-4A-N,actuationoftheautomaticsprinklersystemwouldmitigatetheheateffectthefirewouldhave'onthestructuralsteelbeamssupportingthefireratedfloorslabsystem.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustionconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i393i:dek UNITIFIRERATEDFLOORSLABABOVEFIREZONE1-38-W.ReferenceDrawingC-206021,Sht.IDESCRIPTION:Thefireratedfloorslabinquestionis2'-3"thickwiththetopofslabatelevation719'-1".'hisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamswhichsupportthisfloorelevation.Thesourceofcombustiblesinthisareaiscabletrays.EVALUATION:Theportionof,FireZoneI-38-WlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireinthisportionofFireZone1-3B-W,actuationoftheautomaticsprinklersystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructural'SteelEvaluation.,ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4..CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/j062i:mab.

UNIT1FIRERATEDFLOORSLABABOVEFIREZONEI-1EReferenceDrawingC-206006,Sheet2Thefireratedfloorslabinquestionis2'-9"thickandthetopofslabisatelevation683'-0".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.TherearenocabletraysinFireZoneI-lElocatedbeneaththisfireratedfloorslab.Evaluation:Mithnocabletrayslocatedbeneaththisfireratedfloorslab;sufficientheattoadverselyaffectthefireratedfloorslabwouldnotbegenerated.Section3.3oftheSummaryReportforStructuralSteelEvaluationprovidesjustificationfortheadequacyofstructuralsteelforacombustibleconfigurationoftwohorizontallystackedcabletrays.Thisareahasnocabletrays.Conclusion:Thefireratedfloor'slababoveFireZoneI-1EasshownonDrawingC-206006,Sheet2,willnotbeadverselyaffectedbyafireinFireZone1-1EsinceapostulatedfireinFireZone1-1Ewouldnotgeneratesufficientheattoweakenthestructuralsteelbeamssupportingthefireratedfloorslab.fm/i414i:dek UNIT1FIRERATEDFLOORSLABABOVEFIREZONE1-3AReferenceDrawingC-206007,Shts.1and2DESCRIPTION:Thefireratedfloorslabinquestionvariesinthicknessfrom2'-9"to4'-9"asshownonthereferencedrawing,Sheet2.Thetopoftheentireslabisatelevation719'-1".Thesourceofcombustiblesbeneaththisfireratedfloorslabisaseriesofhorizontalandverticalcabletraysasdepictedonthereferencedrawing.Itshouldbenotedthatthetoptwotraysarecommittedtobefirewrapped.EVALUATION:Astructuralanalysiswasperformedonthe4'-9"thickportionofthereinforcedconcreteslababovethefirezoneinquestion.TheanalysisdemonstratedthatthisreinforcedconcreteslabiscapableofsupportingitselfwithouttheW21x127beamswhichunderlieit.Theonlyrequiredstructuralsteelbeamsbeneaththe4'-9"thickslabaretheW21X127steelbeams(witha2"thicksteelplateonthebottomflange)whichliedirectlyunderthe4'-6"thickwalls.Therequiredsteelbeamsouthofcolumnline25isprotectedfromtheeffectsofafirebytheNFPA13sprinklersystem.Section3.4oftheSummaryReportforStructuralSteelEvaluationprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisrequiredsteelbeamisboundedbytheanalysisinSection3.4.TherequiredW21X127steelbeamnorthofcolumnline25wasanalyzedbytheEnergyBalanceMethodasdevelopedinSection3.2oftheSummaryReport.Thisanalysiscalculatedtheratioofthecriticalenergyneededtoheatthisstructuralsteelbeamtothecriticaltemperature(Ec)tothepredictedheatreleaseforthiscombustibleconfiguration(H')tobe1.17whichisgreaterthantherequiredminimumvalueof1.0.ThisanalysisverifiesthestructuralintegrityoftherequiredW21X127steelbeam.Astructuralanalysiswasalsoperformedonthe2'-9"thickportionofthereinforcedconcreteslababovethefirezoneinquestion.ThisanalysisdemonstratedthatthisreinforcedconcreteslabiscapableofsupportingitselfwithoutthetwoW24X55steelbeamswhichunderlieit.ThisslabissupportedonthesouthendbytheW21X127(acceptabilityasdiscussedabove)andonthenorthendbythe2'-0"thickconcretewallbeneaththeslab.Therefore,theheateffectontheW24X55steelbeamsisinconsequentialsincethe2'-9"concreteslabisstructurallyacceptablewithoutthese2steelbeams.CONCLUSION:Basedontheaboveevaluation,thefireratedfloorslababoveFireZone1-3Awillnotbeadverselyaffectedastheresultofapostulatedfireinthisarea.fm/i448i:mab

.QUNIT1FIRERATEDFLOORSLABABOVEFIREZONE1-3B-WReferenceDrawingC-206021,Sht.2DESCRIPTION:Thefireratedfloorslabinquestionis2'-3"thickwiththetopofslabatelevation719'-1".Thisreinforcedconcreteslabactscomposi'telywiththestructuralsteelbeamswhichsupportthisfloorelevation.Thesourceofcombustiblesinthisareaiscabletrays.EVALUATION:TheportionofFireZone1-38-Wlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressi'onsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireinthisportionofFireZone1-3B-W,actuationoftheautomaticsprinklersystemwould-mitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection.3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.'CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/j076i:mab

UNIT1FIRERATEDFLOORSLABABOVEFIREZONE1-4A-WReferenceDrawingC-206008,Sheets153Thefireratedfloorslabinquestionis1'-9"thicksouthofcolumnline26.5and3'-3"thicknorthofcolumnline26.5asdepictedonthereferencedrawing.Thetopoftheentireslabisatelevation749'-1".Thisreinforcedconcreteslabactscompositelywithaseriesofstructuralsteelbeamswhichsupportthisfloorelevation.ThesourceofcombustiblesinFireZone1-4A-Wconsistofanumberofcabletrayslocatedthroughoutthefirezone.Evaluation:TheportionofFireZone1-4A-WlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.Intheeventofa'ireinthisportionofFireZone1-4A-W,actuationoftheautomaticsprinklersystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustionconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i392i:dek

~p, UNITIFIRERATEDFLOORSLABABOVEFIREZONESI-4A-WANDI NReferenceDrawingC-206008,Sht.5DESCRIPTIONThefireratedfloorslabinquestionisI'-9"thickwiththetopofslabatelevation749'-1".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thesourceofcombustiblesbeneaththisfireratedfloorslabiscabletrays.,Evaluation:TheportionsofFireZonesI-4A-WandI-4A-NlocatedbeneaththefireratedfloorslabinquestionareprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireintheseportionsofFireZones1-4A-Wand1-4A-N,actuationoftheautomaticsprinklersystemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthefireratedfloorslabsystem.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfire.suppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i453i:mab UNIT1FIRERATEDFLOORSLABABOVEFIREZONE1-5A-SIReferenceDrawingC-206010,Sheets.1&2Thefireratedslabinquestionis3'-0"thickapproximately5-1/2'outhofcolumnline27.5and1'-9"thicknorthofthispoint.Thetopoftheentireslabisatelevation779'-1".Thisslabactscompositelywithaseriesofstructural.steelbeamsasshownonthereferencedrawing.ThecombustiblesinFireZone1-5A-Sconsistofanumberofhorizontalandverticalcabletrayslocatedthroughoutthefirezone.Evaluation:TheportionofFireZone1-5A-SlocatedbeneaththefireratedslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireinthisportionofFireZone1-5A-S,actuationoftheautomaticsuppressionsystemwouldmitigatetheeffectsofthefireonthestructuralsteelbeamssupportingthisfireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i383i:dek

,UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-1FReferenceDrawingC-206011,Sheet1Thefireratedfloorslabinquestionis2'-9"thickandthetopofslabisatelevation683'-0".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thesourceofcombustiblesinthisareaistwohorizontalcabletrayslocatedapproximately11'eneaththebottomofthestructuralsteelbeams.Evaluation:Section3.3oftheSummaryReportforStructuralSteelEvaluationprovidesjustificationfortheadequacyofstructuralsteelforacombustibleconfigurationoftwohorizontallystackedcabletrays.Thetwohorizontallystackedcabletraysinthisfirezonearelocatedapproximately11'eneaththebottomofthestructuralsteelbeamswhereasthecabletraysdiscussedinSection3.3ofthereportareonlyonefootbelowthesteelbeams.ThisincreaseddistanceaddstothemarginofsafetyalreadycontainedintheSection3.3analysis.Conclusion:Thefireratedfloorslab.aboveFireZone2-1FasshownonDrawingC-206011,Sheet1,willnotbeadverselyaffectedbyafireinFireZone2-1FsinceapostulatedfireinFi.reZone2-1Fwouldnotgeneratesufficientheattoweakenthestructuralsteelbeamssupportingthefireratedfloorslab.fm/i396i:dek UNIT2FIRERATEDFLOORSLABABOVEFIREZONES2-5C,2-5A-SAND2-5BReferenceDrawingC-206015,Shts.1,2and3.DESCRIPTION:..ThefireratedfloorslabinquestionvariesinthicknessfromI'-9"to2'-3"asshownonthereferencedrawing.Thetopoftheentireslabisatelevation779'-I".Thisreinforcedconcreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thecombustiblesinthesefirezoneslocatedbeneaththefireratedfloorslabarecabletraysofvaryingelevationandlocationasshownonthereferencedrawing.EVALUATION:Theportionofthefireratedfloorslab,locatednorthofcolumnline34.5hasonlytwohorizontalcabletrays.Section3.3oftheSummaryReportforStructuralSteelEvaluationprovidesthejustificationfortheadequacyofstructuralsteelforacombustibleconfigurationoftwohorizontallystackedcabletrays.Theconditionanalyzedinthesummaryreportboundsthiscombustibleconfigurationoftwoside-by-sidehorizontalcabletrays.Theportionofthefireratedfloorslabinquestionlocatedsouthofcolumnline34.5hasbeenstructurallyevaluatedtodeterminewhichsteelbeamsaretheminimumrequiredtosupportthisentirefloorslabarea,Theresultsofthisanalysisconcludedthatfivestructuralsteelbeamsarenecessarytosupportthefloorslab.ThesesteelbeamsarenotedonSht.Iofthereferencedrawing.Theotherbeamsarenotrequiredsincethe2'-9"thickreinforcedconcreteslabiscapableofspanningbetweenthesefiverequiredmembers.ThesefiverequiredsteelbeamswerethenanalyzedbytheEnergyBalanceMethodasdevelopedinSection3.2oftheSummaryReportforStructuralSteelEvaluation.Thisanalysisdeterminedtheratioofthecriticalenergyneededtoheateachrequiredstructuralsteelbeamtothecriticaltemperature(Ec)tothepredictedheatreleaseforthecombustibleconfigurationsurroundingeachbeam(H').Inallfiveinstancesthisratio"(Ect/H')"wasdeterminedtobegreaterthantherequiredminimumvalueof1.0.Thisanalysisverifiestheintegrityoftherequiredstructuralsteelbeamsintheareaintheeventofapostulatedfire.CONCLUSION:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,apostulatedfireinFireZones2-5C,2-5A-Sand2-5Bwouldnotgeneratesufficientheattoadverselyimpacttherequiredstructuralsteelbeamssupportingthefireratedfloorslab.'fm/j089i:mab UNIT2FIRERATEDFLOORSLABABOVEFIREZONE2-4GReferenceDrawingC-206014,Sheets152Thefireratedfloorslabinquestionis1' 1/2"thickwiththetopofslabatelevation761'-10".Thisreinforced.concreteslabactscompositelywiththestructuralsteelbeamstosupportthiselevationasshownonthereferencedrawing.Thesourceofcombustiblesinthisfirezoneistwocabletrayslocatedgreaterthan16'elowthestructuralsteelsupportingthiselevation.Evaluation:Section3.3oftheSummaryReportforStructuralSteelEva)fiationprovidesjustificationthattwohorizontallystackedcabletrayswi'l~lnotadverselyaffecttheintegrityofthestructuralsteelbeams.Thetwocabletraysinthisfirezonearelocatedapproximately14'elowtheoverheadstructuralsteelbeamswhereasthecabletraysdiscussedinSection3.3ofthereportareonlyonefootbelowthesteelbeams.Thisincreaseddistanceaddstothemarg'inof,safetyalreadycontainedintheSection3.3analysis.Furthermore,ananalysisusingtheEnergyBalanceMethodasdevelopedinSection3.2oftheSummaryReportshowedtheratioofthecriticalenergyneededtoheatthestructuralsteeltothecriticaltemperature(Ec)tothepredictedheatreleaseforthiscombustibleconfiguration(H)$obeapproximately6.4whichismuchgreaterthantherequiredminimumvalueof1.0.Thisanalysissubstantiatestheintegrityofthestructuralsteelbeamsabovethiscombustibleconfiguration.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,thestructuralsteelbeamssupportingelevation761'-10"aboveFireZone2-4Gwillnotbeadverselyaffectedastheresultof'postulatedfireinthisarea.fm/i413i:dek 0

UNIT2FIRERATEDFLOORSLABABOVEFIREZONES2-4A-WAND2-4A-NReferenceDrawingC-206013,Sheet5Thefireratedfloorslabinquestionis1'-9"thickandthetopoftheslabisatelevation749'-1"..Thisreinforcedconcreteslabactscompositelywithaseriesofstructuralsteelbeamstosupportthisfloorelevationasshownonthereferencedrawing.Thesourceofcombustiblesinthisareaiscabletrayslocatedthroughoutthefirezones.Evaluation:TheportionsofFireZones2-4A-Wand2-4A-NlocatedbeneaththefireratedfloorslabinquestionisprotectedbyanautomaticfiresuppressionsprinklersystemwhichhasbeeninstalledinaccordancewithNFPA13.IntheeventofafireintheseportionsofFireZones2-4A-Wand2-4A-N,actuationoftheautomaticsprinkler.systemwouldmitigatetheheateffectthefirewouldhaveonthestructuralsteelbeamssupportingthisfireratedfloorslab.ThebasisforthisevaluationispresentedinSection3.4oftheSummaryReportforStructuralSteelEvaluation.ThissectionofthereportprovidesthejustificationfortheNFPA13sprinklersystem'sheatabsorptioncapabilitywithrespecttocabletrayfires.ThecombustibleconfigurationbeneaththisfireratedfloorslabisboundedbytheanalysisinSection3.4.Conclusion:Basedontheaboveevaluationandthespecificcombustibleconfigurationbeneaththefireratedfloorslabinquestion,theexistingautomaticfiresuppressionsprinklersystemcanbeexpectedtoprotectthestructuralsteelbeamswithawidemarginofsafetyintheeventofapostulatedfireinthisarea.fm/i456i:mab