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{{#Wiki_filter:~yPP:..IL.~TWONORTHNINTHSTRSPT,AllENTOWN,PA.18101PHONE)(215)821-5151April4,1975Qc~ulat'ogMr.JamesP.O'ReillyDirector,OfficeofXnspectionandEnforcementU.S.nuclearRegulatoryCommission631ParkAvenueKingofPrussia,PA1/406SUSQUEHANNASTEAMELECTRICSTATIOHIIG'ERXiIRT'iMTOilPOTENTIALDEFICIENCY"R1OO450FXLE840-4PLA-60
{{#Wiki_filter:~yPP:..IL.~TWONORTHNINTHSTRSPT,AllENTOWN,PA.18101PHONE)(215)821-5151April4,1975Qc~ulat'og Mr.JamesP.O'ReillyDirector, OfficeofXnspection andEnforcement U.S.nuclearRegulatory Commission 631ParkAvenueKingofPrussia,PA1/406SUSQUEHANNA STEAMELECTRICSTATIOHIIG'ERXiIRT'iMTOilPOTENTIAL DEFICIENCY "R1OO450FXLE840-4PLA-60


==DearMr.O'Reilly:==
==DearMr.O'Reilly:==
InaccordanceT~ithlOCFR50.55(e),attached.aretvocopiesofaninterimreportonapotentialdeficiencyTThichTTasdiscussedwithyourMr.Heishmanont~farch6>1975.Verytrulyyours,'N.CurtisVicePresident-EngineeringEcConstructionSworntoandsubsciibedbeforemethis~2$oi,'/',1975NotaryPublicMyCommissionExpires:P4~,li~<Q)P.c-Mr.DonaldF.KnuthDirectorOfficeofXnspectionandEnforcementU.S.huclearRegulatoryCommissionWashington,DC20555~g'fi(1~PSNNSYlVANIAPOWER8,lIGHTCOMPANY  
 
/~~DATEPomtTIAL'DEFICX...:CrIDitTX"IED':!!arch.6,1975FACILITY:SusquehannaSteamElectricStation,Units1and2TOPICOFXi~isIbfH"PORT:Additionalloadshavebeenidentifidwhichshould,beconsideredinthedesignofthesuppressionpoolstructuresandequipment.Themagnitudeofthese'loadsandtheirapplicabilitytotheSSESdesignbaseshavenotbeendetermined.SCOP""OFIliTEHD<H"PORT:Asrequiredby1OC."-H50.$$(e)thisinterimreportissubmittedtodescribeapotentialdeficiencywhichmayhaveacversea<ectsontneSusquehannaSteamElectricStationUnits1and.2(SSES).Thisrepot.alsoadvisestheCommission'fthephenomenainvolved,providesapreliminaryindicationofimplications,anddescribescorrectiveactionunderway.XDEbTIFXCATIONOFPO'x~itTXALDEFICIT'FACY:TheprimarycontainmentdesignbasesandloadcombinationsdescribedintheSSESPSAHSections5.2.2andC.2.6donotexplicitlyincludethefollowingphenomena:1)SvppressionPoolSwell2)ContainmentVentPipeHorizontalLoadsfromsteamcondensation3)bhinSteamSafety/ReliefValvedischargepipeairclearingThesephenomenawerepeviouslye'theconsiderednotlimitingorwereconsiderednotrelevanttotneSSES.'KXXpressuesuppressioncontainment.TworecentlettersfromGeneral.ElectricCompany(NSSSvendor)toBechtelPowerCorporation(ArchitectEngineer)identifyinformati6nthathasbeendevelopedfromtheParkXXXPressureSuppressionTestFaci3,ity(PS":)and"hich-maybeapplicabletotheSSESContainment.Thephenomenaandtheirimplicationsaredescribedbelow.DESCRIPTIO~iiOFFrZ)40'..-iA:Twogroupsofphenomenahavebeenidentified:Onegroupoccursasaresultofthepostulatedlossofcoolantaccident(LOCA)wniletheothergroupoccursasaresultoftheactuationofmainsteamsafety/reliefvalves.Itshould.berealizedthatthepreciseloadsapplicabletoSSEShavenotbeenfixedatpresent,however,prelim'naryconservativeestimatesindicatethatportionsoftheexistingdesignmayrequiremodification.IX@AWhentheLOCAoccusthcairinthedry"ellisforceddownthevent,pipesintothesuppressionpool.Thecompressedairbubbleformedattheend.ofeachvent  
Inaccordance T~ithlOCFR50.55(e),
~~'I VPage2~,0causesthewateinthesuppressionpooltoriseasaligamentwnenthebubbleisformed'ndthenexpands.Asthcbuobleexpandsandr'sesinthepool,theligamentofwaterdecreasesuntilapoinatwhichtnebubblebreaksthroughtheremaininglayerformingaCwophase"froth"ofairandwater.-Str'ucturesandequipmentthatareabovethesuppressionpoolwillbesubjectedtoanimpingementanQ/ordragload.fromthispoolswellaction.Thetypeand'magnitudeofloadisafunctionoftheheightaboveCheinitialwatersurface.Theseloadsarenotapplieddirectlytothefissionproductoarrier.AconservativeextrapolationofthedataavailablefromG"'sHarkXXiverificationtestprograminthePSTFhas'beenpreparedforprclimina>ydeterminationofstructuralloads.Fromthispeliminaryconservativeevaluation,thereareindi-cationsthatsomemoQificationand/orrelocationofequipmentorstructuralmembers",couldberequired.Pipeseismicbracing,drywelltowetwellvacuumbreakers,S/RValvepiping,suppressionpoolhydrogenrecombinersandthediaphragmslabareintheregionaffected.bypoolswell.Followingthepoolswelltransient,Chereisaperiod.ofquasisteadystatesteamflowthroughtheventpipesCothesuppressionpool.informationfromtestingperformedataforeignpressuresuppressioncontainmentindicatesthatthereare'ateralloadswhichoccurontheverticalventpipes.Nhenapplyingaloadwhichwasdeterminedfromboundingthedataavailablefromtheforeigntests,itwasdeterminedthatadditionalbracingfortheventsmayoerequiredtoaccommodatetheload.S/RVALVEDiSCHARGEThedischargepipingofasafety/reliefvalvecontainsnon-condensablecontainmentatmosphereandacolumnofwaterpriortoactuation.Followingsafetyrelief.valveactuationpressurebuildsupinsidethepipingassteamcompressesthenon-condensablesandforcesChewaterfromthcpipe.Theatmospherefollowsthewaterintheformofahighpressurebuoble.Onceinthepool,thebubbleexpandsanalogoustoaspringandacceleratesthesurroundingwaterradiallyoutward.Themomentumofthewatercausesthebuobletooverexpandandthebubblepressurebecomesnegative,ThisnegativepressureslowsdownandfinallyreversesChemotionofthewater,lead'ng'othecompressionofthebubble,andthesequencerepeatsitselfuntilthebuoblereachesthesurfaceofthepool.Tnebubbleoscillationcausespressurethroughoutthesuppressionpoolresultinginoscillatoryloadsonpoolboundariesandsubmergedcomponents.Forpreliminaryevaluation,clearingloadsvereestablishedusingthetechniquepresentedinIKBO-10859.itisfeltChat'theloadsusedwereveryconservative.Thispreliminaryinvestigationindicatesthatsomemodificationtothesafetyreliefvalvedischargep'pingmaybereouired.Thispipingmaybere-routedtominimizethemagnitudeofthepressureoscillationsonthelinerplateo"itmaybenecessarytochangetheconfigurationoftheendofthepipetobreakupthehighpressureairbubble.
attached.
M~en'loadsspecificallya~U.cabletoSSESduetothesephenomenaaredefined.areviewofadequacyoftheSSESdesignfeatureswillbemade.STATUSOFTiEPROD..CTTheconstructionofSSESisapproximately10$.complete.Thesuppressionpool.baseslabsandlinerplatesarecompleteandinplace.TheUnit1reactorsupportpedestalanditslinerplatearecompleteuptothediaphragnslabandarealsoinplace.TheUnit1suppressionpoolrebariscompleteandinplacewhiletheUnit2suppressionpoolrebarisbeingfabricated.InstallationofstructuralsteelandrebarfortheUnit1diaphragmslabisnearly'complete.CORRECTIVEACTIONKG)ERdAYAnintensiveeffortbyPPM,BechtelandGeneralElectricCo.tobetteridentifytheloadsduetothesephenomenaisunderway.Thepreliminarytasksofdevelopingaplanforresolutionoftheseissuesandaschedulenavenearlybeencompleted.klorkisproceedingonthedevelopmentofmathematicalmodelstodetermine'd+amicloadfactorsandtogenerateloaddata.iniswillbeaugmentedbyatestprogramwhichisapplicabletoverificationofthemathematicalmodels'developed,Thelasttaskwillbetodeterminetheva.iousloadsfortheSSEScontainment,todetermineloadcombinationstobeused,and.tocompleteanyrequired.designchanges.AschedulefortheseactivitieswillbesubmittedtotheiTRCinthenearfuture.PPMwillkeepthe'ommissioninformedofdevelopmentsasaresultof.theworkunderwayoConcretepoursandothercriticalactivitiesinvolvingtheContainmentwillbesuspendedunt'1necessarymodificationsinthisareahavebeenidentified.PriortoresumingconstrueionofanyaffectedportionoftheContain.",.,nt,theproposed.modificationswillbereviewedwiththeHRC.
aretvocopiesofaninterimreportonapotential deficiency TThichTTasdiscussed withyourMr.Heishmanont~farch6>1975.Verytrulyyours,'N.CurtisVicePresident-Engineering EcConstruction Sworntoandsubsciibed beforemethis~2$oi,'/',1975NotaryPublicMyCommission Expires:P4~,li~<Q)P
.c-Mr.DonaldF.KnuthDirectorOfficeofXnspection andEnforcement U.S.huclearRegulatory Commission Washington, DC20555~g'fi(1~PSNNSYlVANIA POWER8,lIGHTCOMPANY  
/~~DATEPomtTIAL'DEFICX...:Cr IDitTX"IED':
!!arch.6,1975FACILITY:
Susquehanna SteamElectricStation,Units1and2TOPICOFXi~isIbfH"PORT:Additional loadshavebeenidentifidwhichshould,beconsidered inthedesignofthesuppression poolstructures andequipment.
Themagnitude ofthese'loadsandtheirapplicability totheSSESdesignbaseshavenotbeendetermined.
SCOP""OFIliTEHD<H"PORT:Asrequiredby1OC."-H50.$
$(e)thisinterimreportissubmitted todescribeapotential deficiency whichmayhaveacversea<ectsontneSusquehanna SteamElectricStationUnits1and.2(SSES).Thisrepot.alsoadvisestheCommission'f thephenomena
: involved, providesapreliminary indication ofimplications, anddescribes corrective actionunderway.
XDEbTIFXCATION OFPO'x~itTXAL DEFICIT'FACY:Theprimarycontainment designbasesandloadcombinations described intheSSESPSAHSections5.2.2andC.2.6donotexplicitly includethefollowing phenomena:
1)Svppression PoolSwell2)Containment VentPipeHorizontal Loadsfromsteamcondensation 3)bhinSteamSafety/Relief Valvedischarge pipeairclearingThesephenomena werepeviouslye'theconsidered notlimitingorwereconsidered notrelevanttotneSSES.'KXXpressuesuppression containment.
TworecentlettersfromGeneral.ElectricCompany(NSSSvendor)toBechtelPowerCorporation (Architect Engineer) identifyinformati6n thathasbeendeveloped fromtheParkXXXPressureSuppression TestFaci3,ity (PS":)and"hich-maybeapplicable totheSSESContainment.
Thephenomena andtheirimplications aredescribed below.DESCRIPTIO~ii OFFrZ)40'..-
iA:Twogroupsofphenomena havebeenidentified:
Onegroupoccursasaresultofthepostulated lossofcoolantaccident(LOCA)wniletheothergroupoccursasaresultoftheactuation ofmainsteamsafety/relief valves.Itshould.berealizedthatthepreciseloadsapplicable toSSEShavenotbeenfixedatpresent,however,prelim'nary conservative estimates indicatethatportionsoftheexistingdesignmayrequiremodification.
IX@AWhentheLOCAoccusthcairinthedry"ellisforceddownthevent,pipesintothesuppression pool.Thecompressed airbubbleformedattheend.ofeachvent  
~~'I VPage2~,0causesthewateinthesuppression pooltoriseasaligamentwnenthebubbleisformed'nd thenexpands.Asthcbuobleexpandsandr'sesinthepool,theligamentofwaterdecreases untilapoinatwhichtnebubblebreaksthroughtheremaining layerformingaCwophase"froth"ofairandwater.-Str'uctures andequipment thatareabovethesuppression poolwillbesubjected toanimpingement anQ/ordragload.fromthispoolswellaction.Thetypeand'magnitude ofloadisafunctionoftheheightaboveCheinitialwatersurface.Theseloadsarenotapplieddirectlytothefissionproductoarrier.Aconservative extrapolation ofthedataavailable fromG"'sHarkXXiverification testprograminthePSTFhas'beenpreparedforprclimina>y determination ofstructural loads.Fromthispeliminary conservative evaluation, thereareindi-cationsthatsomemoQification and/orrelocation ofequipment orstructural members",couldberequired.
Pipeseismicbracing,drywelltowetwellvacuumbreakers, S/RValvepiping,suppression poolhydrogenrecombiners andthediaphragm slabareintheregionaffected.
bypoolswell.Following thepoolswelltransient, Chereisaperiod.ofquasisteadystatesteamflowthroughtheventpipesCothesuppression pool.information fromtestingperformed ataforeignpressuresuppression containment indicates thatthereare'ateral loadswhichoccurontheverticalventpipes.Nhenapplyingaloadwhichwasdetermined fromboundingthedataavailable fromtheforeigntests,itwasdetermined thatadditional bracingfortheventsmayoerequiredtoaccommodate theload.S/RVALVEDiSCHARGE Thedischarge pipingofasafety/relief valvecontainsnon-condensable containment atmosphere andacolumnofwaterpriortoactuation.
Following safetyrelief.valveactuation pressurebuildsupinsidethepipingassteamcompresses thenon-condensables andforcesChewaterfromthcpipe.Theatmosphere followsthewaterintheformofahighpressurebuoble.Onceinthepool,thebubbleexpandsanalogous toaspringandaccelerates thesurrounding waterradiallyoutward.Themomentumofthewatercausesthebuobletooverexpand andthebubblepressurebecomesnegative, ThisnegativepressureslowsdownandfinallyreversesChemotionofthewater,lead'ng'othecompression ofthebubble,andthesequencerepeatsitselfuntilthebuoblereachesthesurfaceofthepool.Tnebubbleoscillation causespressurethroughout thesuppression poolresulting inoscillatory loadsonpoolboundaries andsubmerged components.
Forpreliminary evaluation, clearingloadsvereestablished usingthetechnique presented inIKBO-10859.
itisfeltChat'theloadsusedwereveryconservative.
Thispreliminary investigation indicates thatsomemodification tothesafetyreliefvalvedischarge p'pingmaybereouired.
Thispipingmaybere-routed tominimizethemagnitude ofthepressureoscillations onthelinerplateo"itmaybenecessary tochangetheconfiguration oftheendofthepipetobreakupthehighpressureairbubble.
M~en'loadsspecifically a~U.cable toSSESduetothesephenomena aredefined.areviewofadequacyoftheSSESdesignfeatureswillbemade.STATUSOFTiEPROD..CTTheconstruction ofSSESisapproximately 10$.complete.
Thesuppression pool.baseslabsandlinerplatesarecompleteandinplace.TheUnit1reactorsupportpedestalanditslinerplatearecompleteuptothediaphragn slabandarealsoinplace.TheUnit1suppression poolrebariscompleteandinplacewhiletheUnit2suppression poolrebarisbeingfabricated.
Installation ofstructural steelandrebarfortheUnit1diaphragm slabisnearly'complete.
CORRECTIVE ACTIONKG)ERdAYAnintensive effortbyPPM,BechtelandGeneralElectricCo.tobetteridentifytheloadsduetothesephenomena isunderway.
Thepreliminary tasksofdeveloping aplanforresolution oftheseissuesandaschedulenavenearlybeencompleted.
klorkisproceeding onthedevelopment ofmathematical modelstodetermine
'd+amicloadfactorsandtogenerateloaddata.iniswillbeaugmented byatestprogramwhichisapplicable toverification ofthemathematical models'developed, Thelasttaskwillbetodetermine theva.iousloadsfortheSSEScontainment, todetermine loadcombinations tobeused,and.tocompleteanyrequired.
designchanges.Aschedulefortheseactivities willbesubmitted totheiTRCinthenearfuture.PPMwillkeepthe'ommission informedofdevelopments asaresultof.theworkunderwayo Concretepoursandothercriticalactivities involving theContainment willbesuspended unt'1necessary modifications inthisareahavebeenidentified.
PriortoresumingconstrueionofanyaffectedportionoftheContain.",.,nt, theproposed.
modifications willbereviewedwiththeHRC.
AJI}}
AJI}}

Revision as of 05:03, 29 June 2018

Susquehanna Units 1 and 2 - Letter Attaching an Interim Report on Potential Deficiency Which Was Discussed with Mr. Heishman on March 6, 1975
ML18025A492
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 04/04/1975
From: Curtis N W
Pennsylvania Power & Light Co
To: O'Reilly J P
NRC/IE, NRC Region 1
References
Download: ML18025A492 (6)
v • d • e


Text

~yPP:..IL.~TWONORTHNINTHSTRSPT,AllENTOWN,PA.18101PHONE)(215)821-5151April4,1975Qc~ulat'og Mr.JamesP.O'ReillyDirector, OfficeofXnspection andEnforcement U.S.nuclearRegulatory Commission 631ParkAvenueKingofPrussia,PA1/406SUSQUEHANNA STEAMELECTRICSTATIOHIIG'ERXiIRT'iMTOilPOTENTIAL DEFICIENCY "R1OO450FXLE840-4PLA-60

DearMr.O'Reilly:

Inaccordance T~ithlOCFR50.55(e),

attached.

aretvocopiesofaninterimreportonapotential deficiency TThichTTasdiscussed withyourMr.Heishmanont~farch6>1975.Verytrulyyours,'N.CurtisVicePresident-Engineering EcConstruction Sworntoandsubsciibed beforemethis~2$oi,'/',1975NotaryPublicMyCommission Expires:P4~,li~<Q)P

.c-Mr.DonaldF.KnuthDirectorOfficeofXnspection andEnforcement U.S.huclearRegulatory Commission Washington, DC20555~g'fi(1~PSNNSYlVANIA POWER8,lIGHTCOMPANY

/~~DATEPomtTIAL'DEFICX...:Cr IDitTX"IED':

!!arch.6,1975FACILITY:

Susquehanna SteamElectricStation,Units1and2TOPICOFXi~isIbfH"PORT:Additional loadshavebeenidentifidwhichshould,beconsidered inthedesignofthesuppression poolstructures andequipment.

Themagnitude ofthese'loadsandtheirapplicability totheSSESdesignbaseshavenotbeendetermined.

SCOP""OFIliTEHD<H"PORT:Asrequiredby1OC."-H50.$

$(e)thisinterimreportissubmitted todescribeapotential deficiency whichmayhaveacversea<ectsontneSusquehanna SteamElectricStationUnits1and.2(SSES).Thisrepot.alsoadvisestheCommission'f thephenomena

involved, providesapreliminary indication ofimplications, anddescribes corrective actionunderway.

XDEbTIFXCATION OFPO'x~itTXAL DEFICIT'FACY:Theprimarycontainment designbasesandloadcombinations described intheSSESPSAHSections5.2.2andC.2.6donotexplicitly includethefollowing phenomena:

1)Svppression PoolSwell2)Containment VentPipeHorizontal Loadsfromsteamcondensation 3)bhinSteamSafety/Relief Valvedischarge pipeairclearingThesephenomena werepeviouslye'theconsidered notlimitingorwereconsidered notrelevanttotneSSES.'KXXpressuesuppression containment.

TworecentlettersfromGeneral.ElectricCompany(NSSSvendor)toBechtelPowerCorporation (Architect Engineer) identifyinformati6n thathasbeendeveloped fromtheParkXXXPressureSuppression TestFaci3,ity (PS":)and"hich-maybeapplicable totheSSESContainment.

Thephenomena andtheirimplications aredescribed below.DESCRIPTIO~ii OFFrZ)40'..-

iA:Twogroupsofphenomena havebeenidentified:

Onegroupoccursasaresultofthepostulated lossofcoolantaccident(LOCA)wniletheothergroupoccursasaresultoftheactuation ofmainsteamsafety/relief valves.Itshould.berealizedthatthepreciseloadsapplicable toSSEShavenotbeenfixedatpresent,however,prelim'nary conservative estimates indicatethatportionsoftheexistingdesignmayrequiremodification.

IX@AWhentheLOCAoccusthcairinthedry"ellisforceddownthevent,pipesintothesuppression pool.Thecompressed airbubbleformedattheend.ofeachvent

~~'I VPage2~,0causesthewateinthesuppression pooltoriseasaligamentwnenthebubbleisformed'nd thenexpands.Asthcbuobleexpandsandr'sesinthepool,theligamentofwaterdecreases untilapoinatwhichtnebubblebreaksthroughtheremaining layerformingaCwophase"froth"ofairandwater.-Str'uctures andequipment thatareabovethesuppression poolwillbesubjected toanimpingement anQ/ordragload.fromthispoolswellaction.Thetypeand'magnitude ofloadisafunctionoftheheightaboveCheinitialwatersurface.Theseloadsarenotapplieddirectlytothefissionproductoarrier.Aconservative extrapolation ofthedataavailable fromG"'sHarkXXiverification testprograminthePSTFhas'beenpreparedforprclimina>y determination ofstructural loads.Fromthispeliminary conservative evaluation, thereareindi-cationsthatsomemoQification and/orrelocation ofequipment orstructural members",couldberequired.

Pipeseismicbracing,drywelltowetwellvacuumbreakers, S/RValvepiping,suppression poolhydrogenrecombiners andthediaphragm slabareintheregionaffected.

bypoolswell.Following thepoolswelltransient, Chereisaperiod.ofquasisteadystatesteamflowthroughtheventpipesCothesuppression pool.information fromtestingperformed ataforeignpressuresuppression containment indicates thatthereare'ateral loadswhichoccurontheverticalventpipes.Nhenapplyingaloadwhichwasdetermined fromboundingthedataavailable fromtheforeigntests,itwasdetermined thatadditional bracingfortheventsmayoerequiredtoaccommodate theload.S/RVALVEDiSCHARGE Thedischarge pipingofasafety/relief valvecontainsnon-condensable containment atmosphere andacolumnofwaterpriortoactuation.

Following safetyrelief.valveactuation pressurebuildsupinsidethepipingassteamcompresses thenon-condensables andforcesChewaterfromthcpipe.Theatmosphere followsthewaterintheformofahighpressurebuoble.Onceinthepool,thebubbleexpandsanalogous toaspringandaccelerates thesurrounding waterradiallyoutward.Themomentumofthewatercausesthebuobletooverexpand andthebubblepressurebecomesnegative, ThisnegativepressureslowsdownandfinallyreversesChemotionofthewater,lead'ng'othecompression ofthebubble,andthesequencerepeatsitselfuntilthebuoblereachesthesurfaceofthepool.Tnebubbleoscillation causespressurethroughout thesuppression poolresulting inoscillatory loadsonpoolboundaries andsubmerged components.

Forpreliminary evaluation, clearingloadsvereestablished usingthetechnique presented inIKBO-10859.

itisfeltChat'theloadsusedwereveryconservative.

Thispreliminary investigation indicates thatsomemodification tothesafetyreliefvalvedischarge p'pingmaybereouired.

Thispipingmaybere-routed tominimizethemagnitude ofthepressureoscillations onthelinerplateo"itmaybenecessary tochangetheconfiguration oftheendofthepipetobreakupthehighpressureairbubble.

M~en'loadsspecifically a~U.cable toSSESduetothesephenomena aredefined.areviewofadequacyoftheSSESdesignfeatureswillbemade.STATUSOFTiEPROD..CTTheconstruction ofSSESisapproximately 10$.complete.

Thesuppression pool.baseslabsandlinerplatesarecompleteandinplace.TheUnit1reactorsupportpedestalanditslinerplatearecompleteuptothediaphragn slabandarealsoinplace.TheUnit1suppression poolrebariscompleteandinplacewhiletheUnit2suppression poolrebarisbeingfabricated.

Installation ofstructural steelandrebarfortheUnit1diaphragm slabisnearly'complete.

CORRECTIVE ACTIONKG)ERdAYAnintensive effortbyPPM,BechtelandGeneralElectricCo.tobetteridentifytheloadsduetothesephenomena isunderway.

Thepreliminary tasksofdeveloping aplanforresolution oftheseissuesandaschedulenavenearlybeencompleted.

klorkisproceeding onthedevelopment ofmathematical modelstodetermine

'd+amicloadfactorsandtogenerateloaddata.iniswillbeaugmented byatestprogramwhichisapplicable toverification ofthemathematical models'developed, Thelasttaskwillbetodetermine theva.iousloadsfortheSSEScontainment, todetermine loadcombinations tobeused,and.tocompleteanyrequired.

designchanges.Aschedulefortheseactivities willbesubmitted totheiTRCinthenearfuture.PPMwillkeepthe'ommission informedofdevelopments asaresultof.theworkunderwayo Concretepoursandothercriticalactivities involving theContainment willbesuspended unt'1necessary modifications inthisareahavebeenidentified.

PriortoresumingconstrueionofanyaffectedportionoftheContain.",.,nt, theproposed.

modifications willbereviewedwiththeHRC.

AJI

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