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"/i;ji'~t'Mvh0;hajj!'iiltHitII'Ijdjill,I'Itl~Illit~"tlj'li'tflt,f'gII40j'jitII"Jti".>>;'vj,>>Ml,jlTV,"1'"'~<<t'Ihj&#xc3;X,:adl4'..l'l'r'IUEII,v>~5'ID~tjI,"jtIIijItt,'j(t,,'ijPij:ilitlJtt't'llIIjtljj)IIItl P.O.BOX0,JUNOBEACH,FL33408.0420~/Pl>)'6FEBRUNY22f988L-88-89U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Gentlemen:Re:St.LucieUnit1DocketNo.50-335AlternateShutdownCaabilitByletterdatedJanuary7,1988(E.G.TourignytoC.0.Woody)NRCtransmittedtheSupplementalSafetyEvaluation(SSE)forSt.LucieUnit1AlternateShutdownCapability.TheSSEsupplementedtheoriginalsafetyevaluationdatedJuly17,1984toaddressafireintheCableSpreadRoom.TheSSEconcludedthatexceptfortwoopenitems,theFloridaPower&LightCompanymethodologyforassuringsafeshutdownforafireintheControlRoomorCableSpreadRoomconformstothecriteriadelineatedinSectionsIII.G.3andIII.L.of10CFR50AppendixRandGenericLetter81-12and86-10.Asrequestedbytheaboveletter,attachedpleasefindFPL'splanstoaddressthefollowingtwoopenitems.TheabsencesofThotindicationonthealternateshutdownpanel,and2~Thelackofananalysisofmultiplehighimpedancefaults.pools8802260198880222PDRADOCN,05000335,'PDRanFPLGroupcompany  
"/i;ji'~t'Mvh0;hajj!'iiltHitII'Ijdjill,I'Itl~Illit~"tlj'li'tflt,f'gII40j'jitII"Jti".>>;'vj,>>Ml,jlTV,"1'"'~<<t'Ihj&#xc3;X,:adl4'..l'l'r'IUEII,v>~5'ID~tjI,"jtIIijItt,'j(t,,'ijPij:ilitlJtt't'llIIjtljj)IIItl P.O.BOX0,JUNOBEACH,FL33408.0420~/Pl>)'6FEBRUNY22f988L-88-89U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Gentlemen:Re:St.LucieUnit1DocketNo.50-335AlternateShutdownCaabilitByletterdatedJanuary7,1988(E.G.TourignytoC.0.Woody)NRCtransmittedtheSupplementalSafetyEvaluation(SSE)forSt.LucieUnit1AlternateShutdownCapability.TheSSEsupplementedtheoriginalsafetyevaluationdatedJuly17,1984toaddressafireintheCableSpreadRoom.TheSSEconcludedthatexceptfortwoopenitems,theFloridaPower&LightCompanymethodologyforassuringsafeshutdownforafireintheControlRoomorCableSpreadRoomconformstothecriteriadelineatedinSectionsIII.G.3andIII.L.of10CFR50AppendixRandGenericLetter81-12and86-10.Asrequestedbytheaboveletter,attachedpleasefindFPL'splanstoaddressthefollowingtwoopenitems.TheabsencesofThotindicationonthealternateshutdownpanel,and2~Thelackofananalysisofmultiplehighimpedancefaults.pools8802260198880222PDRADOCN,05000335,'PDRanFPLGroupcompany  


U.S.NuclearRegulatoryCommissionL-88-89PagetwoBasedondiscussionswiththeNRCProjectManagerforSt.LuciePlantandtheageoftheissue,FPLfeelsitwouldbebeneficialtomeetanddiscusstheresolutionoftheopenitems.ThemeetingarrangementswillbediscussedwiththeNRCProjectManager.Shouldyouhaveanyadditionalquestions,pleasecontactus.Verytrulyyours,SeniorVicePresident-NuclearWFC/GRM/gpAttachmentcc:Dr.J.NelsonGrace,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlant ATTACHMENTST.LUCIEUNIT1ALTERNATESHUTDOWNCAPABILITYSUPPLEMENTALSAFETYEVALUATIONOPENITEMSalternateshutdownpanel.DuringtheNRC's1985specialfireprotectioninspectionreviewofalternateshutdowninstrumentation,bothI&EandNRRconfirmedtheuseofTcold.NRCletterdated4/22/85TransmittalInspectionReport85-06whichstated:"EOP2-0030144,AlternateShutdown-Instrumentationformonitoringreactorcoolanthotlegtemperaturewasnotinstalledatthehotshutdownpaneloranyotherremotestation.IENotice84-09identifiesthissystemprocessvariableasbeingrequired.ThelicenseeprovidedinformationindicatingthatthisissuewasdiscussedwithNRRandnothavingThotindicationwasacceptabletotheNRCasdocumentedinNRCmeetingminutesofMay7,1982.ThelicenseeformallysubmittedletterL-82-208datedMay17,1982whichdescribestheanalyses(seeFSARSection15.3and15.C.4)thatnaturalcirculationmaintainsacloserelationshipbetweenreactorcoolanthotandcoldlegtemperatures.SeveralnaturalcirculationcooldownsonUnit1haveverifiedtheaccuracyoftheaboveresults;thus,anoperatorcanmonitorprimarysystemconditionsfromthehotshutdownpanelusingTcold.TheinspectordiscussedtheseissueswithNRR,AuxiliarySystemsBranch,whoconfirmedthatthelicensee'sapproachissatisfactory."St.LucieUnit2SafetyEvaluationReportNUREGSupplement0843(SER)referencesFPLletterL-82-208datedMay17,1982whichrespondstotheuseofTcqldonUnit2Section9.5.1.6ofSERSupplement3identifiestheuseofTE-,1115andTE-1125whichprovideTcoldindication.Itstatesthat:"Basedontheabove,weconcludethattheinstrumentationoutsideofthecontrolroom,and,therefore,thealternativeshutdowncapability,complieswiththeguidelinesofSectionIII.LofAppendixRandistherefore,acceptable."GRM/016.ASD Basedontheabove,theinformationsubmittedtoNRRin1982forUnit2andincorporatedinthe1983submittalforUnit1wassatisfactory.Furthermore,theUnit2SERSupplement3reflectsNRCacceptance.FPL,therefore,considersthisissuetoberesolved.''mpedancefaults.Postulatingmultiplehighimpedancefaultssimultaneouslyforbranchcircuitsgoesbeyondthescopeofelectricaldistributionsystemdesign.Forthemultiplehighimpedancefaultscenariototakeplace,multiplebranchcircuitcableswouldhavetofailalongtheirlengthinsuchamannerastoresultinauniqueinsulationresistancethatwouldproducealeakagecurrenttoground,orconductortoconductor,whichwhenaddedtotheconductorloadwouldresultinacurrentjustbelowthebranchcircuitprotectivedevicerating.Thesefaultcurrentswouldthenhavetobesustainedlongenoughtocausethesupplybreakertotrip.Thus,animprobablecombinationoftemporaryleakagecurrentinmultiplecableswouldhavetooccursimultaneouslytotripthesupplybreaker.Duetothelowprobabilityoftheabovedescribedspecificfaultconditionofthecables,ananalysisofmultiplehighimpedancefaultswasnotdeemednecessary.However,FPLwilladdageneralnoteintheAlternateShutdownproceduretopermitrestorationofessentialequipmentshouldabusfeederbreakertripduetofire.Thenotewillalertplantpersonneltotripallbusloadspriortorestorationofpowertothebus,andtorestartonlynecessaryloads.GRM/016.ASD  
U.S.NuclearRegulatoryCommissionL-88-89PagetwoBasedondiscussionswiththeNRCProjectManagerforSt.LuciePlantandtheageoftheissue,FPLfeelsitwouldbebeneficialtomeetanddiscusstheresolutionoftheopenitems.ThemeetingarrangementswillbediscussedwiththeNRCProjectManager.Shouldyouhaveanyadditionalquestions,pleasecontactus.Verytrulyyours,SeniorVicePresident-NuclearWFC/GRM/gpAttachmentcc:Dr.J.NelsonGrace,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlant ATTACHMENTST.LUCIEUNIT1ALTERNATESHUTDOWNCAPABILITYSUPPLEMENTALSAFETYEVALUATIONOPENITEMSalternateshutdownpanel.DuringtheNRC's1985specialfireprotectioninspectionreviewofalternateshutdowninstrumentation,bothI&EandNRRconfirmedtheuseofTcold.NRCletterdated4/22/85TransmittalInspectionReport85-06whichstated:"EOP2-0030144,AlternateShutdown-Instrumentationformonitoringreactorcoolanthotlegtemperaturewasnotinstalledatthehotshutdownpaneloranyotherremotestation.IENotice84-09identifiesthissystemprocessvariableasbeingrequired.ThelicenseeprovidedinformationindicatingthatthisissuewasdiscussedwithNRRandnothavingThotindicationwasacceptabletotheNRCasdocumentedinNRCmeetingminutesofMay7,1982.ThelicenseeformallysubmittedletterL-82-208datedMay17,1982whichdescribestheanalyses(seeFSARSection15.3and15.C.4)thatnaturalcirculationmaintainsacloserelationshipbetweenreactorcoolanthotandcoldlegtemperatures.SeveralnaturalcirculationcooldownsonUnit1haveverifiedtheaccuracyoftheaboveresults;thus,anoperatorcanmonitorprimarysystemconditionsfromthehotshutdownpanelusingTcold.TheinspectordiscussedtheseissueswithNRR,AuxiliarySystemsBranch,whoconfirmedthatthelicensee'sapproachissatisfactory."St.LucieUnit2SafetyEvaluationReportNUREGSupplement0843(SER)referencesFPLletterL-82-208datedMay17,1982whichrespondstotheuseofTcqldonUnit2Section9.5.1.6ofSERSupplement3identifiestheuseofTE-,1115andTE-1125whichprovideTcoldindication.Itstatesthat:"Basedontheabove,weconcludethattheinstrumentationoutsideofthecontrolroom,and,therefore,thealternativeshutdowncapability,complieswiththeguidelinesofSectionIII.LofAppendixRandistherefore,acceptable."GRM/016.ASD Basedontheabove,theinformationsubmittedtoNRRin1982forUnit2andincorporatedinthe1983submittalforUnit1wassatisfactory.Furthermore,theUnit2SERSupplement3reflectsNRCacceptance.FPL,therefore,considersthisissuetoberesolved.''mpedancefaults.Postulatingmultiplehighimpedancefaultssimultaneouslyforbranchcircuitsgoesbeyondthescopeofelectricaldistributionsystemdesign.Forthemultiplehighimpedancefaultscenariototakeplace,multiplebranchcircuitcableswouldhavetofailalongtheirlengthinsuchamannerastoresultinauniqueinsulationresistancethatwouldproducealeakagecurrenttoground,orconductortoconductor,whichwhenaddedtotheconductorloadwouldresultinacurrentjustbelowthebranchcircuitprotectivedevicerating.Thesefaultcurrentswouldthenhavetobesustainedlongenoughtocausethesupplybreakertotrip.Thus,animprobablecombinationoftemporaryleakagecurrentinmultiplecableswouldhavetooccursimultaneouslytotripthesupplybreaker.Duetothelowprobabilityoftheabovedescribedspecificfaultconditionofthecables,ananalysisofmultiplehighimpedancefaultswasnotdeemednecessary.However,FPLwilladdageneralnoteintheAlternateShutdownproceduretopermitrestorationofessentialequipmentshouldabusfeederbreakertripduetofire.Thenotewillalertplantpersonneltotripallbusloadspriortorestorationofpowertothebus,andtorestartonlynecessaryloads.GRM/016.ASD}}
}}

Revision as of 16:31, 18 May 2018

Responds to 880107 Supplemental Safety Evaluation Re Alternate Shutdown Capability.Util Will Add General Note in Procedure to Permit Restoration of Essential Equipment Should Bus Feeder Breaker Trip Due to Fire
ML17221A641
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 02/22/1988
From: CONWAY W F
FLORIDA POWER & LIGHT CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
GL-81-12, GL-86-10, L-88-89, NUDOCS 8802260198
Download: ML17221A641 (7)
v • d • e


Text

REGULATORYINFORMATIONDISTRIBUTIONSTEM(RIDS)VQ4ACCEEEION,PIBR:8802260198DOC.DATE:88/02/22NOTARIZED:NOFACIL:50-335St.LuciePlantiUnitiiFloridaPower8cLightCo.AUTH.NAMEAUTHORAFFILIATIONCONWAYeW.F.FloridaPoeer&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)

SUBJECT:

Respondsto880107supplementalsafetyevaluationrealternateshutdoencapability.Utilwilladdgeneralnoteinproceduretopermitrestorationofessentialequipshouldbusfeederbreakertripduetofire.DISTRIBUTIONCODE:A006DCOPIESRECEIVED:LTRENCLSIZE:TITLE:OR/LicensingSubmittal:FireProtectionNOTES:DOCKETI05000335RECIPIENTIDCODE/NAMEPD2-2LATOURIQNYrEINTERNAL'CRSNRRWERMEILnJNRR/DESPSBBD1QFE01EXTERNAL'PDRNSICCOPIEBLTTRENCL101133101111111RECIPIENTIDCODE/NAMEPD2-2PDARM/DAF/LFMBNRR/DEBT/ADB7E4OQC15-B-18NRCPDRCOPIEBLTTRENCL5510111011TOTALNUMBEROFCOPIEBREQUIRED:LTTR19ENCL15

"/i;ji'~t'Mvh0;hajj!'iiltHitII'Ijdjill,I'Itl~Illit~"tlj'li'tflt,f'gII40j'jitII"Jti".>>;'vj,>>Ml,jlTV,"1'"'~<<t'IhjÃX,:adl4'..l'l'r'IUEII,v>~5'ID~tjI,"jtIIijItt,'j(t,,'ijPij:ilitlJtt't'llIIjtljj)IIItl P.O.BOX0,JUNOBEACH,FL33408.0420~/Pl>)'6FEBRUNY22f988L-88-89U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Gentlemen:Re:St.LucieUnit1DocketNo.50-335AlternateShutdownCaabilitByletterdatedJanuary7,1988(E.G.TourignytoC.0.Woody)NRCtransmittedtheSupplementalSafetyEvaluation(SSE)forSt.LucieUnit1AlternateShutdownCapability.TheSSEsupplementedtheoriginalsafetyevaluationdatedJuly17,1984toaddressafireintheCableSpreadRoom.TheSSEconcludedthatexceptfortwoopenitems,theFloridaPower&LightCompanymethodologyforassuringsafeshutdownforafireintheControlRoomorCableSpreadRoomconformstothecriteriadelineatedinSectionsIII.G.3andIII.L.of10CFR50AppendixRandGenericLetter81-12and86-10.Asrequestedbytheaboveletter,attachedpleasefindFPL'splanstoaddressthefollowingtwoopenitems.TheabsencesofThotindicationonthealternateshutdownpanel,and2~Thelackofananalysisofmultiplehighimpedancefaults.pools8802260198880222PDRADOCN,05000335,'PDRanFPLGroupcompany

U.S.NuclearRegulatoryCommissionL-88-89PagetwoBasedondiscussionswiththeNRCProjectManagerforSt.LuciePlantandtheageoftheissue,FPLfeelsitwouldbebeneficialtomeetanddiscusstheresolutionoftheopenitems.ThemeetingarrangementswillbediscussedwiththeNRCProjectManager.Shouldyouhaveanyadditionalquestions,pleasecontactus.Verytrulyyours,SeniorVicePresident-NuclearWFC/GRM/gpAttachmentcc:Dr.J.NelsonGrace,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlant ATTACHMENTST.LUCIEUNIT1ALTERNATESHUTDOWNCAPABILITYSUPPLEMENTALSAFETYEVALUATIONOPENITEMSalternateshutdownpanel.DuringtheNRC's1985specialfireprotectioninspectionreviewofalternateshutdowninstrumentation,bothI&EandNRRconfirmedtheuseofTcold.NRCletterdated4/22/85TransmittalInspectionReport85-06whichstated:"EOP2-0030144,AlternateShutdown-Instrumentationformonitoringreactorcoolanthotlegtemperaturewasnotinstalledatthehotshutdownpaneloranyotherremotestation.IENotice84-09identifiesthissystemprocessvariableasbeingrequired.ThelicenseeprovidedinformationindicatingthatthisissuewasdiscussedwithNRRandnothavingThotindicationwasacceptabletotheNRCasdocumentedinNRCmeetingminutesofMay7,1982.ThelicenseeformallysubmittedletterL-82-208datedMay17,1982whichdescribestheanalyses(seeFSARSection15.3and15.C.4)thatnaturalcirculationmaintainsacloserelationshipbetweenreactorcoolanthotandcoldlegtemperatures.SeveralnaturalcirculationcooldownsonUnit1haveverifiedtheaccuracyoftheaboveresults;thus,anoperatorcanmonitorprimarysystemconditionsfromthehotshutdownpanelusingTcold.TheinspectordiscussedtheseissueswithNRR,AuxiliarySystemsBranch,whoconfirmedthatthelicensee'sapproachissatisfactory."St.LucieUnit2SafetyEvaluationReportNUREGSupplement0843(SER)referencesFPLletterL-82-208datedMay17,1982whichrespondstotheuseofTcqldonUnit2Section9.5.1.6ofSERSupplement3identifiestheuseofTE-,1115andTE-1125whichprovideTcoldindication.Itstatesthat:"Basedontheabove,weconcludethattheinstrumentationoutsideofthecontrolroom,and,therefore,thealternativeshutdowncapability,complieswiththeguidelinesofSectionIII.LofAppendixRandistherefore,acceptable."GRM/016.ASD Basedontheabove,theinformationsubmittedtoNRRin1982forUnit2andincorporatedinthe1983submittalforUnit1wassatisfactory.Furthermore,theUnit2SERSupplement3reflectsNRCacceptance.FPL,therefore,considersthisissuetoberesolved.mpedancefaults.Postulatingmultiplehighimpedancefaultssimultaneouslyforbranchcircuitsgoesbeyondthescopeofelectricaldistributionsystemdesign.Forthemultiplehighimpedancefaultscenariototakeplace,multiplebranchcircuitcableswouldhavetofailalongtheirlengthinsuchamannerastoresultinauniqueinsulationresistancethatwouldproducealeakagecurrenttoground,orconductortoconductor,whichwhenaddedtotheconductorloadwouldresultinacurrentjustbelowthebranchcircuitprotectivedevicerating.Thesefaultcurrentswouldthenhavetobesustainedlongenoughtocausethesupplybreakertotrip.Thus,animprobablecombinationoftemporaryleakagecurrentinmultiplecableswouldhavetooccursimultaneouslytotripthesupplybreaker.Duetothelowprobabilityoftheabovedescribedspecificfaultconditionofthecables,ananalysisofmultiplehighimpedancefaultswasnotdeemednecessary.However,FPLwilladdageneralnoteintheAlternateShutdownproceduretopermitrestorationofessentialequipmentshouldabusfeederbreakertripduetofire.Thenotewillalertplantpersonneltotripallbusloadspriortorestorationofpowertothebus,andtorestartonlynecessaryloads.GRM/016.ASD

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