ML17262B044
| ML17262B044 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 10/08/1992 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17262B042 | List: |
| References | |
| NUDOCS 9210160159 | |
| Download: ML17262B044 (22) | |
Text
Attachment ARevisetheTechnical Specification pagesasfollows:RemoveInsert3.5-143~713.7-23~733.7-53.7-64.6-54.6-5a3.5-143~713~723~733e73a3.7-53.7-64.6-4a4.6-54.6-5aPDRADOCK05000244PDR
~iI 7.WiththenumberofoperablechannelslessthantheTotalNumberofChannels, operation mayproceedprovidedtheinoperable channelisplacedinthetrippedcondition within1hour.ShouldthenextChannelFunctional Testrequirethebypassofaninoperable channeltoavoidthegeneration ofatripsignal,operation mayproceeduntilthisChannelFunc-tionalTest.AtthetimeofthisChannelFunctional Test,orifatanytimethenumberofoperablechannelsislessthantheMinimumOperableChannels, eithera)beatHotShutdownwithinthenext6hoursandanRCStemperature lessthan350'Fwithinthefollowing 6hours,or8.b)energizetheaffectedbuswithadieselgenerator.
WiththenumberofoperablechannelsonelessthantheMinimumOperableChannelsrequired, restoretheinoperable channeltooperablestatuswithin48hoursorbeinHotShutdownwithinthenext6hoursandatanRCStemperature lessthan350'Fwithinthefollowing 6hours.9.10.WiththenumberofoperablechannelsonelessthantheTotalNumberofChannelsrequired, operation mayproceeduntilthenextChannelFunctional Testprovidedtheinoperable, channelisplacedinthetrippedpositionwithin1hour.AtthenextChannelFunctional Test,oratanytimethenumberofoperablechannelsislessthantheMinimumOperableChannelsrequired, beatHotShutdownwithinthenext6hoursandatanRCStemperature lessthan350'Fwithinthefollowing 6hours.WiththenumberofoperablechannelsonelessthantheMinimumOperableChannelsrequired, restoretheinoperable channeltooperablestatuswithin48hoursorbeinHotShutdownwithinanadditional 6hours,andatcoldshutdownwithinthefollowing 30hours.WiththenumberofoperablechannelslessthantheTotalNumberofChannels, operation mayproceedprovidedtheinoperable channelisplacedinthetrippedcondition within2hours.ShouldthenextChannelFunctional Testrequirethe[bypassofaninoperable channeltoavoidthegeneration ofanactuation signal,operation mayproceeduntilthisChannelFunctional Test.AtthetimeofthisChannelFunctional Test,orifatanytimethenumberofoperablechannelsislessthantheMinimumOperableChannelsrequired, beatHotShutdownwithin6hoursandatColdShutdownwithinthefollowing 30hours.Amendment No.493.5-14 h
3.7AUXILIARY ELECTRICAL SYSTEMSAlicabilit Appliestotheavailability ofelectrical powerfortheoperation ofplantauxiliaries.
Todefinethoseconditions ofelectrical poweravailability necessary toprovideforthecontinuing availability ofengineered safeguards.
3.7.13.7.1.1Secification Whenincoldshutdownorrefueling, withfuelinthe(reactorvessel,thefollowing conditions aretobemet:3.7.1.2a.Oneindependent offsitepowersourceoperable, orbackfeedthroughunitauxiliary transformer 11;andb.Onetrainof480-voltbuses(14and18,or16and17)operable; andc.Onedieselgenerator operablewithonsitesupplyof5,000gallonsoffuelavailable andeitherbuses14and18,or16and17,capableofbeingsuppliedfromthatdieselgenerator.
d.Onebatteryandonedcsystem,andatleast150ampsofbatterychargercapacitytothebatterymustbeoperable.
e.Either120voltA.C.Instrument Bus1Aor1Cenergized fromitsassociated.
inverter.
ActionsToBeTakenIfConditions of3.7.1.1AreNotMet:Withlessthantheaboveminimumrequiredpowersourceoperable, immediately suspendalloperations involving positivereactivity changes,corealterations, movementofAmendment No.493~71Proposed 3.7.2irradiated fuelandinitiatecorrective actiontorestoretherequiredpowersourcestooperablestatus.Secification 3.7.2.1Thereactorcoolantsystemshallnotbetakenabovethemodeindicated unlessthefollowing conditions aremet:a;Abovecoldshutdown; 1.Oneindependent offsitepowersourceoperable.
2.the480-voltbuses14and18(TrainA)andbuses16and17(TrainB)areenergized.
3.thetwodieselgenerators areoperablewithonsitesupplyof5,000gallonsoffuelavailable foreachdieselgenerator.
4.bothbatteries andbothdcsystemsareoperable.
5.atleast150ampsofbatterychargingcapacityforeachDCsystemthatisinservice.6.120voltA.C.Instrument Buses1Aand1Careener-gizedfromtheirassociated inverters.
7.120voltA.C.Instrument Bus1Bisenergized, fromitsassociated constant.
voltagetransformer fromMCC1C.b.Above350F:1.Allconditions of3.7.2.1aabovearemet;and2.Twooffsitesources(34.5kv-4160voltstationservicetransformers, 12Awithdedicated circuit751,and12Bwithdedicated circuit767)areopera-ble.3.7.2.2ActionsToBeTakenIfConditions of3.7.2.1AreNotMet:a.Operation above350'Fmaycontinuewithoneoffsitesourceinoperable, providedallremaining conditions of3.7.2.1aremet.b.Withoneorbothindependent offsitesourcesoperable, and.onedieselgenerator inoperable abovecoldshutdown, demonstrate theoperability oftheremaining dieselgenerator by:Amendment No.493~72Proposed 1.Performing thesurveillance requirements identified inSpecifications 4.6.1.b.4 and4.6.1.b.6 within1hourandatleastonceper24hoursthereafter and.restoretheinoperable dieselgenerator tooperablestatuswithin7days;OTHERWISE:
2.Reducetoamodeequaltoorbelowhotshutdownwithinthenext6hoursandbeincold,shutdownwithinthefollowing 30hours.c.Withonesafetyrelated480VBus(i.e.,bus14or16or17or18)de-energized, re-energize thebuswithin1hourorreducetoamodeequaltoorbelowhotshutdownwithinthenext6hoursandbeincoldshutdownwithinthefollowing 30hours,unlesscorrective actionsarecompletethatpermitcontinued operation (i.e.,thebusisreturned.
toservice).
d.Withbothindependent offsitesourcesinoperable, bothdieselgenerators mustbeoperable.
Inaddition, restoreoneindependent offsitesourcewithin72hours,orreducetoamodeequaltoorbelowhotshutdownwithinthenext6hoursandbeincoldshutdownwithinthefollowing 30hours.e.Operation abovecoldshutdownmaycontinueiflessthan150ampsofbatterychargingcapacityisavailable toonedcsystem,providedatleast150ampsofbatterychargingcapacityisavailable toeachdcsystemwithin2hours.IIfnotavailable, reducetoa'odeequaltoorbelowhotshutdownwithinthenext6hoursandbeincoldshutdownwithinthefollowing 30hours.Amendment No.473~73Proposed f.WitheitherInstrument Bus1Aor1Cnotenergized fromitsassociated inverter:
1.Re-energize thebuswithin2hours(backupormaintenance supply),AND2.Re-energize thebusfromasafetyrelatedsupply(backuporinverter) within24hours,AND3.Re-energize thebusfromitsassociated inverterwithin72hours,OTHERWISE 4.Reducetoamodeequaltoorbelowhotshutdownwithinthenext6hoursandbeincoldshutdownwithinthefollowing 30hours.g.WithInstrument Bus1Bnotenergized, fromitsassociated constantvoltagetransformer (CVT)fromMCC1C:2.Re-energize thebuswithin2hours(maintenance supply),ANDRe-energize thebusfromitsassociated CVTfromMCC1Cwithin7days,OTHERWISE Reducetoamodeequaltoorbelowhotshutdownwithinthenext6hoursandbeincoldshutdownwithinthefollowing 30hours.Amendment No.493'3aProposed I1J Safeshutdownoftheplant,and(2)themitigation andcontrolofaccidentconditions withintheplant.WhentheRCSisabovecoldshutdown, bothemergency dieselgenerators arerequiredtobeoperable.
Thetwodieselgenerators havesufficient capacityto'startandrunalltheengineered safeguards equipment atdesignloads.The.safeguards'quipment operatedfromonedieselgenerator canadequately coolthecoreand.maintainthecontainment pressurewithinthedesignvalueforanylossofcoolantincident.
Theminimumdieselfueloilinventory ismaintained toassurethatbothdieselscanoperateattheirdesignratingsfor24hours.Thisassuresthatbothdieselscancarrythedesignloadsofrequiredengineered safeguards equipment foranylossofcoolantaccidentconditions foratleast40hours,orforoneengineered safetyfeaturetrainfor80hours.'~'ommercial oilsuppliesandtruckingfacilities existtoassuredeliveries within8hours.Theoffsitepowersourceconsistsofseparatededicated.
34.5kv-4160voltstationservicetransformers servedbydedicated 34.5kvlines(12Atransformer withdedicated circuit751,or12Btrans-formerwithdedicated circuit767)inoperablestatus.Eitheroffsitesourceofpowercansupplyallauxiliary loadsandtransfercanbeaccomplished withinthetimeconstraints ofGDC17.Thus,GDC17isexplicitly met.Withfuelinthereactorvesselaminimumofoneoffsitesource,oneonsitesourceofACpowerandoneDCpowertrainarerequired.
Theoffsitepowersourcemaybeprovidedby,oneofthreeconfigura-tions:Amendment No.473.7-5 1.Transformer 12Aserved,byadedicated 34.5kvline(circuit751),or2.Transformer 12Bservedbyadedicated.
34.5kvline(circuit767),or3.Backfeedthroughunitauxiliary transformer 11.Theoffsitepowersourceisthepreferred, sourceofACpower.Operability ofanoffsitesourcerequiresthatonestationservicetransformer servedbyadedicated 34.5kvlineisoperating andproviding powertotheunit.Theemergency dieselgenerator providespoweruponlossoftheoffsitesource.Oneemergency dieselgenerator with5,000gallonsoffuelcanprovidepowertoaminimumlevelofengineered safeguards equipment for40hours(therequiredsafeguards loadsatcoldshutdown/refueling aresignifi-cantlylessthanduringpoweroperation).
Oneoperabledieselfueloiltransferpumpisrequiredtosupplyfuelfromoneofthetwofuelstoragetankstothedaytankoftheoperabledieselgenera-tor.WithlessthanoneoffsiteACpowersource,andoneonsiteACpowersource,oneDCpowertrain,andonebatterybackedinstrument busavailable, nooperations involving positivereactivity changes,corealterations, andmovementofirradiated fuelshalloccur.Batterychargerswithatleast150ampscapacityshallbeinserviceforeachbatterysothatthebatteries willalwaysbeatfullcharge.Thisensuresthatadequatedcpowerwillbeavail-able.Theplantcanbesafelyshutdownwithouttheuseofoffsitepowersinceallvitalloads(safetysystems,instruments, e'tc.)canbesuppliedfromtheemergency dieselgenerators andthestationbatteries.
Instrument Buses1A,1B,and1Cprovidepowertovitalplantinstrumentation.
Allthreebusesarebackedupbysafetyrelatedemergency supplies; buslAfrombattery1A,bus1Cfrombattery1B,andbus1Bfromdieselgenerator 1A.Amendment No.493.7-6Proposed 4.6.4Instrument BusesEachsafetyrelatedinstrument busrequiredtobeoperable, shallbedemonstrated operableatleastonceper7daysby:1.Verifying nominalvoltageindications ontheIn-strumentBuses1A,1B,1C.2.Verifying propersupplybreakeralignment forInstrument Buses1A,1B,and1C.3.Verifying properstaticswitchalignment forIn-strumentBuses1Aand.1C.Amendment No.47,494.6-4a Basis'hetestsspecified aredesignedtodemonstrate thatthedieselgenerators willprovidepowerforoperation ofequipment.
Theyalsoassurethattheemergency generator systemcontrolsandthecontrolsystemsforthesafeguards equipment willfunctionautomatically intheeventofalossofallnormal480VACstationservicepower.(X)Thetestingfrequency specified willbeoftenenoughtoidentifyandcorrectanymechanical orelectrical deficiency beforeitcanresultinasystemfailure.Thefuelsupplyandstartingcircuitsandcontrolsarecontinuously monitored.
andanyfaultsareindicated byalarm.Anabnormalcondition inthesesystemscanbeidentified withouthavingtotestthedieselgenerators.
Periodictestsarealsospecified todemonstrate thattheoffsitepowersourceswillprovidepowerforoperation ofequipment.
Offsitepowersourceoperability requirescorrectbreakeralignment andindicated.
poweravailability fromthetwopreferred powercircuits, 767and751,toth'e4160voltbuses.Theserequirements aremetbymonitoring nominalvoltageindications onthehigh-voltagesideoftransformers 12Aand.12B;andonthe4160voltbuses12Aand12B.Offsitepowersourceindependence requiresseparate4160voltcircuitssupplying powertothe4160voltbuses.Interlocks preventconcurrent closureof12AXand12BZ,OR12AYand12BY;andsurveillance isspecified toensureseparation ismaintained.
Instrument buspowersourceoperability requirescorrectbreakeralignment andindicated poweravailability.
Theserequirements aremetbymonitoring nominalvoltageindications onthebusesandproperbreakeralignment.
Amendment.
No.47,494.6-5 Furthermore, toassureindependence betweenredundant Class1E480voltbuses14and18(TrainA)andbuses16and17(TrainB),tiebreakers52/BT16-14 and52/BT17-18 arerequiredtobeopenwhentheplantmodeisabove200F.Oncetiebreakersareopen,interlocks preventclosurewhenindependent andredundant busesareenergized.
Stationbatteries maydeteriorate withtime,butprecipitous failureisextremely unlikely.
Thesurveillance specified isthatwhichhasbeendemonstrated overtheyearstoprovide.anindication ofacellbecomingunserviceable longbeforeitfails,andtoensure.thatthebatterycapacityisacceptable.
Theequalizing charge,asrecommended bythemanufacturer, isvitaltomaintaining theampere-hour capability ofthebattery.Asacheckupontheeffectiveness oftheequalizing charge,thebatteryshouldbeloadedratherheavilyandthevoltagemonitored asafunctionoftime.Tfacellhasdeteriorated orifaconnection isloose,thevoltageunderloadwilldropexcessively indicating replacement ormaintenance.
Theminimumpermissible "on-sitefuelinventory, 10,'000gallons,(5,000gallonsforeachgenerator),
issufficient foroperation underloss-of-coolant accidentconditions oftwoengineered safetyfeaturestrainsfor40hours,orforonetrainfor80hours,orforoperation ofbothdieselgenerators attheirdesignratingsfor24hours.(2)References (1)UFSAR,Section8.3(2)UFSAR,Section9.5.4Amendment No.47,494.6-5A Attachment BThepurposeofthisAmendment istoincorporate requirements fortheoperability andsurveillance ofsafetyrelated.instrument busesintotheAuxiliary Electrical SystemsTechnical Specifications.
ThisAmendment alsocorrectsaninconsistency intheexistingrequiredactionstatement foralossofbothoffsite'ower supplies.
ThedetailedchangesarelistedinTable1.IRequirements forsafetyrelatedinstrument busoperability havebeenaddedbasedonreactorcoolantsystemoperation aboveand.belowcoldshutdown.
Previously noinstrument busoperability requirements, requiredactions,norsurveillance requirements werespecified intheTechnical Specifications.
Consequently, thisAmendment isconsidered anenhancement totheTechnical Specif-ications.
ThechangesinthisAmendment arebasedontheStandardTechnical Specifications forWestinghouse Pressurized WaterReactors(NUREG-0452),
withdeviations toaddressspecificdesignfeaturesattheGinnaStation.Specification 3.7.1.1wasmodifiedtoaddtherequirement foronebatterybackedsafetyrelatedinstrument bustobeoperableduringcoldshutdownandrefueling.
Thephrase"whenincoldshutdownorrefueling" wasaddedtothisSpecification sincepreviously noapplicable modeswereexplicitly specified.
Thisspecification ensurestheavailability ofonechannelofcontinuous indication whileallowingformaintenance and'surveillance testingononesafetyrelatedbattery.Section3.7.2.1.a wasmodifiedtoaddrequirements forsafetyrelatedinstrument busoperability abovecoldshutdown.
TheSpecification requiresoperability ofbothbatterybackedinstru-mentbusesandtheemergency dieselgenerator backedinstrument bus.AlthoughStandardTechnical Specifications onlyprovideoperability requirements forbatterybackedbuses(i.e.vitalbuses),thedieselbackedbusatGinnaprovidespowerforinstru-mentation usedfortheReactorProtection System'(RPS),
Engineered SafetyFeaturesActuation System(ESFAS),andforpostaccidentmonitoring functions.
Therefore operability requirements arespecified forthisbus.Previoustechnical specifications identified nooperability requirements forinstrument busesabovecoldshutdown.
Thisspecification requiresallthreebusestobeoperable, andistherefore cons'idered conservative.
Section3.7.2.2.d waschangedtorequireplantshutdowntothecoldshutdownmodeifnooffsitesourcesareavailable.
Thisisconsidered aconservative changesincepreviously thespecification onlyrequiredachieving aReactorCoolantSystemtemperature below350'F.Thechangewasmadeduetoanapparentinconsistency withSpecification 3.7.2.1.a.1 whichrequiredoneoffsitesourcetobeoperableabovecoldshutdown.
Theactionsspecified.
withinSection3.7.2.2.f providerequirements whenonesafetyrelated,batterybackedinstrument busisoutofservice.Thespecification requiresthebustobere-energized withintwohours,re-energized fromasafetyrelatedsupplywithin24hours,andre-aligned toitsbatterybackedsupplywithin72hours.TheGinnaStationsafetyrelatedbatterybackedinstrument buses(AandC)canbesuppliedfromthreesources:
1.ItsnormalsupplyfromasafetyrelatedDCbusviaaninverter; 2.Abackupsupplyfromasafetyrelated480Vbus(dieselgenerator backed)viaaconstantvoltagetransformer; 3.Amaintenance supplyfromanon-safety related480Vbusviaaconstantvoltagetransformer.
StandardTechnical Specifications donotaddresstheavail-abilityofmultiplebackupsupplies.
Assuch,thisproposedspecification deviatesfromtheStandardTechnical Specifica-tioninthatadditional timeisallowedtorestorethebustoitsnormalsupplyifthebusisre-energized fromitssafetyrelatedbackupsupply.Wheneitherinstrument busAorCissuppliedfromitssafetyrelatedbackupsupplytheplantisonlysusceptible toasinglefailurecausinglossofthecontainment sprayautomatic actuation signal.Giventhelowprobability oftherequirement ofthisfunction(largebreakLOCAormainsteamline breakincontainment),
andtheavailability ofmanualinitiation, theallowedtimeisconsidered appropriate.
Theactionsspecified inSection3.7.2.2.g providerequire-mentswhentheemergency dieselgenerator backedinstrument bus(B)tobeoutofservice.Thespecification requiresthebustobere-energized within2hoursandre-energized fromitssafetyrelatedconstantvoltagetransformer within7days.TheStandardTechnical Specifications containnoactionrequirements fordieselbackedinstrument busesoutofservice.Instrument busBhasonlyonealternate supply,amaintenance supplyfromanon-safety related480Vbusviaaconstantvoltagetransformer.
Againtheonlysafetyrelatedfunctionsusceptible toasinglefailureisthecontainment sprayautomatic actuation signal.Thetimeallowedtorestorethebustoitsnormalsupplyischosenbased.onthelowprobability thatthisfunctionisrequired, thetimerequired.
torepairorreplacefailedequipment, andtobeconsistent withtheallowedoutofservicetimeforitssafetyrelatedbackupsupply(ref.Specification 3.7.2.2.B.1)
ActionStatement 11ofTechnical Specification Section3.5wasalsochangedtoallow2hourstoplaceaninoperable Containment Sprayautomatic initiation channelintrip.Thischangeprovidesconsistency withSpecifications 3.7.2.2.f andg.Aninoperable instrument buscausesaninoperable automatic Containment Sprayinitiation channelsincethisfunctionisenergizetoactuate.Noeasilyachievable means'xiststoplacetheinoperable channelintripifinstrument powerisunavailable.
Thisallowedtime(2hours,consistent withNUREG-0452) isacceptable duetothelowprobability ofrequiring theautomatic initiation function(LBLOCAorMSLBincontainment),
andthecontinued availability ofthemanualinitiation function.
Thebasisforsection3.7wasmodifiedtoreflecttheseadditional specifications.
Inadditionachangewasmadetothebasisforonsitedieselfueloilrequirements.
Thischangeisaclarification resulting fromtheElectrical 0~Distribution SystemFunctional Inspection (EDSFI)conducted atGinnain1991.Researchofthedesignbasisfortheminimumonsitefueloilstoragerequirements revealedthatstoragecapability wasspecified toallowoperation ofbothemergency dieselgenerators atdesignratingsfor24hours.Inresponsetoquestions duringtheinitiallicensing oftheplant,thisrequirement wastranslated intohoursthattheemergency dieselgenerators wouldbeabletosupportEn-gineeredSafetyFeaturesloadsforalargebreakLOCA,andhoursthatthedieselswouldbeabletosupporthotstandbyoperation.
Thehotstandbycomparison isnotconsidered asafetyrelatedrequirement andhastherefore beendeletedasabasisforthespecification.
Theoriginal24hourre-quirement hasbeenadded,and.thesafetyrelated40hourrequirement retained.
Section4.6.4wasaddedtotheTechnical Specifications toprovidesurveillance requirements forthesafetyrelatedinstrument buses.Theserequirements ensureproperalignment andfunctionality ofthebuses.Themethodology andfrequen-cyisconsistent withStandard.
Technical Specification surveillance requirements forvitalinstrument buses.ThebasisforSection4.6wasalsomodifiedtoprovidethebasisforthisnewrequirement, andtoclarifytheminimumonsitedieselfueloilrequirement asdescribed.
above.Inaccordance with10CFR50.91, thesechangestoTechnical Specifications havebeenevaluated todetermine iftheoperation ofthefacilityinaccordance withtheproposedamendment would:1.involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated; or2..createthepossibility ofanewordifferent kindofaccidentpreviously evaluated; or3.involveasignificant reduction inamarginofsafety.Theseproposedchangesdonotincreasetheprobability orconsequences ofapreviously evaluated accidentorcreateanewordifferent kindofaccident.
Further,thereisnounacceptable reduction inthemarginofsafetyforanyTechnical Specification.
Therefore, Rochester GasandElectricsubmitsthattheissuesassociated withthisAmendment areoutsidethecriteriaof10CFR50.91, andanosignificant hazardsfindingiswar-ranted.
TABLE1DETAILEDDESCR'IPTION OFCHANGESPAGE3.5-143~713.7-13~723~73CHANGEActionStatement 11.Changed"within1hour"to"within2hours"Section3.7.1.1Addedphrase"Whenincoldshutdownorrefueling,...."
Section3.7.1.1.Addediteme.Section3.7.2.1.a.
Addeditems6and7.Section3.7.2.2.d.
Changedrequiredactionwithtwooffsitesourcesinoperable, torequireachieving coldshutdown.
REASONFORCHANGEThischangeallowsadditional timetoplaceaninoperable Containment Sprayautomatic initiation channelintrip.Thisisconsistent withallowedoutofservicetimesfortheinstrument buses,andisnecessary duetothedifficulty inplacingachannelintripwhenaninstrument busisdeenergized.
Thechangeisacceptable duetothelowprobability ofrequiring automatic sprayinitiation, andtheavailability ofmanualinitiation.
Notechnical change.Minorclarification tospecifymodeswhenthisSpecification isapplicable.
NewTechnical Specification requirements forsafetyrelatedbatterybackedInstrument BusOperability duringcoldshutdown.
Therewerepreviously norequirements.
NewTechnical Specification requirements forsafetyrelatedInstrument Busoperability abovecoldshutdown.
Therewerepreviously norequirements.
Previousactionstatement onlyrequiredachieving anRCStemperature below350'F.Thiswasinconsistent withSpecification 3.7.2.1.a.1 whichrequiresoneoffsitesourcetobeoperableabovecoldshutdown.
Thenewrequirement ismorestringent thanthepreviousrequirement.
%AGE3%73a3+73aCHANGESection3.7.2.2.f.
Providesactionstobetakenforsafetyre'atedbatterybackedinstrument busesoutofserviceabovecoldshutdown.
Section3.7.2.2.g.
ProvidesactionstobetakenwhensafetyrelatedInstrument BusB(dieselgenerator backed)isoutofserviceabovecoldshutdownREASONFORCHANGENewTechnical Specification actionrequirements areconsistent withStandard, Technical Specifications fortimeallowedtore-energize thebus.Additional timetorestorethebustoitsinverterisallowedifthebusisre-energized fromasafetyrelatedsupply(dieselgenerator backed).Therewerepreviously noactionrequirements.
NewTechnical Specification actionrequirements areconsistent withStandardTechnical Specifications fortimeallowed,tore-energize vitalinstrument buses.Thetimeallowedtoreturnthebustoitssafetyrelatedsupplyisconsistent withtheallowedoutofservicetimeforitsassociated safetyrelatedsupply(reference Technical Specification 3.7.2.2.G.1)
Therewerepreviously noactionrequirements.
PAGE3.7-53.7-63.7-6CHANGEFirstparagraph.
Clarified thebasisforminimumonsitedieselgenerator fueloilrequirement:
1.addedfullloadrequirement.
2.Removed"hotstandby"reference.
Firstparagraph.
Addedcoldshutdownrequirement ofonebatterybackedinstrument bustothebasissection.Thirdparagraph.
Addeddescription ofthesafetyrelatedinstrument busestothebasissection.REASONFORCHANGENotechnical change.'Research conducted inresponsetoquestions duringtheGinnaEDSFIindicated thatthedesignbasisofthefuelstoragetankswastoprovidecapacityforfullloadoperation ofbothdieselsfor24hours.Duringtheinitialplantlicensing processquestions wereaskedregarding howthisequatedtoLOCAESFloadingandhotstandbyoperation (ref.FSARSections8.2.3andAppendix8A).Thisresultedinthe40hourdurationforLOCAESFloading(80hoursfor1train)andthe111hourhotstandbyduration.
Ginnahasadoptedthe40hourLOCAESFloadingasadesignrequirement.
Thehotstandbycomparison hasneverbeenconsidered adesignrequirement andhastherefore beendeletedfromreference here.Additionduetonewrequirements inTechnical Specification 3.7.1.1.e.
Description ofsafetyrelatedinstrument buseswasaddedtothebasisofsection3.7sincesafety-related instrument busesarenowcoveredbythisTechnical Specification.
Previously instrument buseswerenotaddressed.
PAGE4.6-4a4.6-54.6-5aCHANGESection4.6.4.Sectionaddedtoprovidesurveillance
.requirements forsafetyrelatedinstrument buses.Addedsixthparagraph tosection4.6basistodescribethebasisofnewinstrument bussurveillance requirements.
Lastparagraph.
Clarified dieselgenerator onsitefueloilrequirement basistobeconsistent withsection3.7(seechangeI5).REASONFORCHANGENewTechnical Specification surveillance requirements.
Theserequirements ensureproperalignment andfunctionality ofthesafetyrelatedinstrument buses.Themethodology andfrequency isconsistent withStandardTechnical Specification requirements forvitalinstrument buses.ProvidesbasisfornewTechnical Specification surveillance requirement 4.6.4.seechangeI7.(Page3.7-5,firstparagraph).
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