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==DearMr.Miller:==
==DearMr.Miller:==
OnJuly8,1993,PP&LmetwiththeNRCtodiscussthedesignandoperationoftheSpentFuelPoolCoolingsystemsinstalledinSusquehannaSESUnits1and2.Duringthecourseofthispresentation,weprovidedupdatedtechnicalinformationsincetheReference1submittal,anddiscussedPP&L'spositionontheSSESlicensingbasisasdocumentedinReference2.Ourmajorconclusionsregardingthepostulatedaccidentscenario(designbasisLOCAcoupledwithanextendedlossofSpentFuelPoolCooling)wereasfollows:~Timetoboilismuchgreaterthan25hoursatanypointwhentheconditionspresentedbytheaccidentscenariobecomeaconcern.Immediateoperatoractionsarenotrequiredtorestorespentfuelpoolcooling.Sufficienttimewillbeavailabletotakeappropriateoperatoractionstorestorespentfuelpoolcoolingandpreventboiling.~CoolingcanberestoredpriortoboilingbyeitherrestorationofthenormalSpentFuelPoolCoolingsystem,orthesafety-related,diesel-backedRHRsysteminFuelPoolCoolingMode.9308i703549308ihPDRADOCK05000387F'DR f4J,"~>'l,w"kfr~II1'  
OnJuly8,1993,PP&LmetwiththeNRCtodiscussthedesignandoperationoftheSpentFuelPoolCoolingsystemsinstalledinSusquehannaSESUnits1and2.Duringthecourseofthispresentation,weprovidedupdatedtechnicalinformationsincetheReference1submittal,anddiscussedPP&L'spositionontheSSESlicensingbasisasdocumentedinReference2.Ourmajorconclusionsregardingthepostulatedaccidentscenario(designbasisLOCAcoupledwithanextendedlossofSpentFuelPoolCooling)wereasfollows:~Timetoboilismuchgreaterthan25hoursatanypointwhentheconditionspresentedbytheaccidentscenariobecomeaconcern.Immediateoperatoractionsarenotrequiredtorestorespentfuelpoolcooling.Sufficienttimewillbeavailabletotakeappropriateoperatoractionstorestorespentfuelpoolcoolingandpreventboiling.~CoolingcanberestoredpriortoboilingbyeitherrestorationofthenormalSpentFuelPoolCoolingsystem,orthesafety-related,diesel-backedRHRsysteminFuelPoolCoolingMode.9308i703549308ihPDRADOCK05000387F'DR f4J,"~>'l,w"kfr~II1' FILEA17-8PLA-4012Mr.C.L.Miller~TheEmergencyServiceWatervalvesthatsupportmakeuptotheSpentFuelPoolhavebeendeterminedtobeaccessible(i.e.<5Rem),evenifaRegulatoryGuide1.3sourcetermisassumed.~EmergencyServiceWatermakeuptooneSpentFuelPoolwilleventuallyfillbothpools.Therefore,accesstotheaccidentunitisnotrequiredtoprovidemakeupwatertoitsSpentFuelPool.~Accesstothenon-LOCAunitisalwaysassuredduetothecapabilitytoisolateitsventilationsystemfromtheaccidentunitusingcontrolsthatexistinthemaincontrolroom.~Removingthecaskstoragepitgateswillprovidecapabilitytoutilizethenon-LOCAunitSpentFuelPoolCoolingsystemifavailable,ortheRHRFuelPoolCoolingModeifitisnot.~EveniftheSpentFuelPoolisassumedtoboilandnooperatoractiontorestorecoolingoccursfor30days,theresultantenvironmentalimpactswillnotpreventadequatelongtermcorecoolingfrombeingmaintained.~ProcedureshavebeenimprovedandoperatorshavebeentrainedtoassuretheproperresponsetoalossofSpentFuelPoolCooling.ModificationstoinstallimprovedlevelandtemperatureindicationtotheSpentFuelPools,althoughnotrequiredtomeettheLicensingBasisofSusquehannaSES,arebeingpursuedinordertofurtherstrengthentheoperatorresponsetothisevent.Thesemodificationsalsoaddresspreviousrecommendationsmadebyourinternalassessmentgrouptoaddlevelandtemperatureindicationtoassisttheoperatorsindailyoperationofthefuelpoolcoolingsystem.~TheLicensingBasisofSusquehannaSESconsiderslossofspentfuelpoolcoolingresultinginpoolboilingtobeinitiatedfromaseismicevent,notaLOCA,andthisisincompliancewithregulatoryrequirements.~TheSSESLicensingBasisisacceptableduetothelackofaneedforimmediateoperatoractiontorestorespentfuelpoolcooling,theextremelylowprobabilityofaDBALOCAcoupledwithanextendedlossofpoolcooling(pertheSSESIPEthisisontheorderof10E-15),andthefactthatensuringthatthespentfueliskeptwatercoveredisanoperatorpriority.
-2-FILEA17-8PLA-4012Mr.C.L.Miller~TheEmergencyServiceWatervalvesthatsupportmakeuptotheSpentFuelPoolhavebeendeterminedtobeaccessible(i.e.<5Rem),evenifaRegulatoryGuide1.3sourcetermisassumed.~EmergencyServiceWatermakeuptooneSpentFuelPoolwilleventuallyfillbothpools.Therefore,accesstotheaccidentunitisnotrequiredtoprovidemakeupwatertoitsSpentFuelPool.~Accesstothenon-LOCAunitisalwaysassuredduetothecapabilitytoisolateitsventilationsystemfromtheaccidentunitusingcontrolsthatexistinthemaincontrolroom.~Removingthecaskstoragepitgateswillprovidecapabilitytoutilizethenon-LOCAunitSpentFuelPoolCoolingsystemifavailable,ortheRHRFuelPoolCoolingModeifitisnot.~EveniftheSpentFuelPoolisassumedtoboilandnooperatoractiontorestorecoolingoccursfor30days,theresultantenvironmentalimpactswillnotpreventadequatelongtermcorecoolingfrombeingmaintained.~ProcedureshavebeenimprovedandoperatorshavebeentrainedtoassuretheproperresponsetoalossofSpentFuelPoolCooling.ModificationstoinstallimprovedlevelandtemperatureindicationtotheSpentFuelPools,althoughnotrequiredtomeettheLicensingBasisofSusquehannaSES,arebeingpursuedinordertofurtherstrengthentheoperatorresponsetothisevent.Thesemodificationsalsoaddresspreviousrecommendationsmadebyourinternalassessmentgrouptoaddlevelandtemperatureindicationtoassisttheoperatorsindailyoperationofthefuelpoolcoolingsystem.~TheLicensingBasisofSusquehannaSESconsiderslossofspentfuelpoolcoolingresultinginpoolboilingtobeinitiatedfromaseismicevent,notaLOCA,andthisisincompliancewithregulatoryrequirements.~TheSSESLicensingBasisisacceptableduetothelackofaneedforimmediateoperatoractiontorestorespentfuelpoolcooling,theextremelylowprobabilityofaDBALOCAcoupledwithanextendedlossofpoolcooling(pertheSSESIPEthisisontheorderof10E-15),andthefactthatensuringthatthespentfueliskeptwatercoveredisanoperatorpriority.
eTqI FILEA17-8PLA-4012Mr.C.L.MillerTheattachedreportprovidesfurtherdocumentationofthedetailsbehindtheaboveconclusions,andisprovidedinresponsetoyourrequestattheJuly8meeting.Ifyoushouldhaveanyquestionsonthismaterial,pleasecontactus.Verytrulyyours,.G.BrAttachmentcc:PRCDocumentControLDeait(original)NRCRegionIMr.G.S.Barber,NRCSr.ResidentInspector-SSESMr.R.J.Clark,NRCSr.ProjectManager-Rockville  
eTqI FILEA17-8PLA-4012Mr.C.L.MillerTheattachedreportprovidesfurtherdocumentationofthedetailsbehindtheaboveconclusions,andisprovidedinresponsetoyourrequestattheJuly8meeting.Ifyoushouldhaveanyquestionsonthismaterial,pleasecontactus.Verytrulyyours,.G.BrAttachmentcc:PRCDocumentControLDeait(original)NRCRegionIMr.G.S.Barber,NRCSr.ResidentInspector-SSESMr.R.J.Clark,NRCSr.ProjectManager-Rockville  
}}
}}

Revision as of 03:43, 3 May 2018

Forwards Rept Entitled, Pp&L Response to NRC Concerns Re Loss of Spent Fuel Pool Cooling Following Loca,Sses,Units 1 & 2, Per 930708 Meeting
ML18030A383
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 08/16/1993
From: BYRAM R G
PENNSYLVANIA POWER & LIGHT CO.
To: MILLER C L
Office of Nuclear Reactor Regulation
Shared Package
ML18026A429 List:
References
PLA-4012, NUDOCS 9308170354
Download: ML18030A383 (6)
v • d • e


Text

,.ACCEIERAT>DDOCUMENTDISTUTIONSYSTEMREGULAYINFORMATIONDISTRIBUTISYSTEM(RIDS)ACCESSION-NBR!9308170354DOC.DATE:93/08/16,NOTARIZED:NOFACIL:50-387SusquehannaSteamElectricStation,Unit1,Pennsylva50-388SusquehannaSteamElectricStation,Unit2,PennsylvaAUTH.NAMEAUTHORAFFILIATIONBYRAMgR.G.PennsylvaniaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONMILLERgC.L.ProjectDirectorateI-2DOCKET0500038705000388R

SUBJECT:

Forwardsreptentitled,"PP&LResponsetoNRCConcernsreLossofSpentFuelPoolCoolingFollowingLOCA,SSES,Units1&2,"per930708meeting.DISTRIBUTIONCODE:A001DCOPIESRECEIVED:LTRIENCLtSIZE:3TITLE:ORSubmittal:GeneralDistribution'NOTES:RECIPIENTIDCODE/NAMEPDl-2LACLARK,RCOPIESLTTRENCL1122RECIPIENTIDCODE/NAMEPD1-2PDCOPIESLTTRENCL11DINTERNAL:ACRSNRR/DRCH/HICBNRR/DSSA/SPLBNUDOCS-ABSTRACTOGC/HDS2EXTERNAL:NRCPDR661111111011NRR/DE/EELBNRR/DRPW/OTSBNRR/DSSA/SRXBOCZEDCBREGAL01NSIC1'11111101111DNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)TOELIMINATEYOURNAMEFROMDISfRII3UTIONLISTSFORDOCUMENTSYOUDON"I'EED!TOTALNUMBEROFCOPIESREQUIRED:LTTR21ENCL19 PennsylvaniaPower8LightCompanyTwoNorthNinthStreet~Allentown,PA18101-1179~215/774-5151RobertG.ByramSeniorVicePresident-Nuclear215/774-7502AUG161993DirectorofNuclearReactorRegulationAttention:Mr.C.L.Miller,ProjectDirectorProjectDirectorateI-2DivisionofReactorProjectsU.S.NuclearRegulatoryCommissionWashington,D.C.20555SUSQUEHANNASTEAMELECTRICSTATIONINFORMATIONONSPENTFUELPOOLCOOLINGPLA-4012FILEA17-8DocketNos.50-387and50-388

References:

1.PLA-3978,RG.ByramtoC.L.Miller,RequestforAdditionalInformationontheEffectsofaLossofSpentFuelPoolCoolingEventFollowingaLossofCoolantAccident",datedMay24,1993.2.PLA-3996,RG.ByramtoC.L.Miller,"InformationonLicensingBasisofSpentFuelPoolCoolingSystem",datedJuly6,1993.

DearMr.Miller:

OnJuly8,1993,PP&LmetwiththeNRCtodiscussthedesignandoperationoftheSpentFuelPoolCoolingsystemsinstalledinSusquehannaSESUnits1and2.Duringthecourseofthispresentation,weprovidedupdatedtechnicalinformationsincetheReference1submittal,anddiscussedPP&L'spositionontheSSESlicensingbasisasdocumentedinReference2.Ourmajorconclusionsregardingthepostulatedaccidentscenario(designbasisLOCAcoupledwithanextendedlossofSpentFuelPoolCooling)wereasfollows:~Timetoboilismuchgreaterthan25hoursatanypointwhentheconditionspresentedbytheaccidentscenariobecomeaconcern.Immediateoperatoractionsarenotrequiredtorestorespentfuelpoolcooling.Sufficienttimewillbeavailabletotakeappropriateoperatoractionstorestorespentfuelpoolcoolingandpreventboiling.~CoolingcanberestoredpriortoboilingbyeitherrestorationofthenormalSpentFuelPoolCoolingsystem,orthesafety-related,diesel-backedRHRsysteminFuelPoolCoolingMode.9308i703549308ihPDRADOCK05000387F'DR f4J,"~>'l,w"kfr~II1' FILEA17-8PLA-4012Mr.C.L.Miller~TheEmergencyServiceWatervalvesthatsupportmakeuptotheSpentFuelPoolhavebeendeterminedtobeaccessible(i.e.<5Rem),evenifaRegulatoryGuide1.3sourcetermisassumed.~EmergencyServiceWatermakeuptooneSpentFuelPoolwilleventuallyfillbothpools.Therefore,accesstotheaccidentunitisnotrequiredtoprovidemakeupwatertoitsSpentFuelPool.~Accesstothenon-LOCAunitisalwaysassuredduetothecapabilitytoisolateitsventilationsystemfromtheaccidentunitusingcontrolsthatexistinthemaincontrolroom.~Removingthecaskstoragepitgateswillprovidecapabilitytoutilizethenon-LOCAunitSpentFuelPoolCoolingsystemifavailable,ortheRHRFuelPoolCoolingModeifitisnot.~EveniftheSpentFuelPoolisassumedtoboilandnooperatoractiontorestorecoolingoccursfor30days,theresultantenvironmentalimpactswillnotpreventadequatelongtermcorecoolingfrombeingmaintained.~ProcedureshavebeenimprovedandoperatorshavebeentrainedtoassuretheproperresponsetoalossofSpentFuelPoolCooling.ModificationstoinstallimprovedlevelandtemperatureindicationtotheSpentFuelPools,althoughnotrequiredtomeettheLicensingBasisofSusquehannaSES,arebeingpursuedinordertofurtherstrengthentheoperatorresponsetothisevent.Thesemodificationsalsoaddresspreviousrecommendationsmadebyourinternalassessmentgrouptoaddlevelandtemperatureindicationtoassisttheoperatorsindailyoperationofthefuelpoolcoolingsystem.~TheLicensingBasisofSusquehannaSESconsiderslossofspentfuelpoolcoolingresultinginpoolboilingtobeinitiatedfromaseismicevent,notaLOCA,andthisisincompliancewithregulatoryrequirements.~TheSSESLicensingBasisisacceptableduetothelackofaneedforimmediateoperatoractiontorestorespentfuelpoolcooling,theextremelylowprobabilityofaDBALOCAcoupledwithanextendedlossofpoolcooling(pertheSSESIPEthisisontheorderof10E-15),andthefactthatensuringthatthespentfueliskeptwatercoveredisanoperatorpriority.

eTqI FILEA17-8PLA-4012Mr.C.L.MillerTheattachedreportprovidesfurtherdocumentationofthedetailsbehindtheaboveconclusions,andisprovidedinresponsetoyourrequestattheJuly8meeting.Ifyoushouldhaveanyquestionsonthismaterial,pleasecontactus.Verytrulyyours,.G.BrAttachmentcc:PRCDocumentControLDeait(original)NRCRegionIMr.G.S.Barber,NRCSr.ResidentInspector-SSESMr.R.J.Clark,NRCSr.ProjectManager-Rockville

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