ML17329A378
| ML17329A378 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 02/12/1992 |
| From: | FITZPATRICK E INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17329A379 | List: |
| References | |
| AEP:NRC:0693CC, AEP:NRC:693CC, NUDOCS 9202200158 | |
| Download: ML17329A378 (34) | |
Text
ACCELERATEDDIS-UTIONDEMONSTIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9202200158DOC.DATE:92/02/12NOTARIZED:NOFACIL:50-315DonaldC.CookNuclearPowerPlant,Unit1,XndianaM50-316DonaldC.CookNuclearPowerPlant,Unit2,XndianaMAUTH.NAMEAUTHORAFFILIATIONFITZPATRICK,E.IndianaMichiganPowerCo.(formerlyIndiana6MichiganRECIP.NAMERECIPIENTAFFILIATIONMURLEY,T.E.DocumentControlBranch(DocumentControlDesk)DOCKET0500031505000316EleRD
SUBJECT:
ApplicationforamendstoLicensesDPR-586DPR-74,changingTS3/4.7.9.1toreflectinstallationoftwofireprotectionwaterstoragetanksEthreepumpstosupplysufficientquantityofcleanwatertofiresuppressionsys.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED'LTRJENCLgSIZE:5+0TITLE:ORSubmittal:GeneralDistribution/NOTES:RECIPIENTIDCODE/NAMEPD3-1LASTANG,JCOPIESLTTRENCL1122RECIPIENTXDCODE/NAMEPD3-1PDCOPIESLTTRENCL11ADDINTERNAL:NRR/DET/ECMB7DNRR/DOEA/OTSB11NRR/DST/SELB7ENRR/DST/SRXB8EOC/PFMBEE01EXTERNAL:NRCPDR11111111101111NRR/DET/ESGBNRR/DST8E2NRR/DST/SICB8H7NUDOCS-ABSTRACTOGC/HDS2RES/DSIR/EIBNSIC11111111101111DNOTETOALL"RIDS"RECIPIENTS:DDPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPXESREQUIRED:LTTR18ENCL16 1IlCvn C$~)tlIndianaMichiganPowerCompanyP.O.Box16631Coiumbus,OH43216lNSllllUllNICNECWNPQWMAEP;NRC:0692CCDonaldC.CookNuclearPlantUnits1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74TECHNICALSPECIFICATIONSCHANGEREQUEST:FIREWATERSTORAGETANKSU.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Attn:T.E.MurleyFebruary12,1992
DearDr.MurleyThisletteranditsattachmentsconstituteanapplicationforchangestotheTechnicalSpecifications(T/Ss)forDonaldC,
CookNuclearPlantUnits1and2inaccordancewith10CFR50.90.WeareproposingtoamendT/S3/47.9.1forbothunitstoreflecttheinstallationoftwofireprotectionwaterstoragetanksandthreepumpstosupplyasufficientquantityofclean,reliablewatertotheplant'sfiresuppressionsystems.Currently,theCookNuclearPlantfiresuppressionsystemissuppliedbyLakeMichigan.However,inthelastfewyearszebramusselshavepropagatedinLakeMichigan,posingathreattothereliabilityoftheexistingfireprotectionsystem.Consequently,wehavedecidedtoerecttwodedicatedfireprotectionwatertanks,whichwillprovideareliablesourceofcleanwatertothefireprotectionsystem.Inaddition,theexisting2000gpmdiesel-enginedrivenpumpswillbemaintainedtofacilitatethecapabilityofobtainingwaterfromLakeMichigan.However,thesepumpsandtheirassociatedpipeswillbeisolatedfromtherestofthefireprotectionwatersystemtoprecludethepossibilityofinfestingthefireprotectionwatersystemwithzebramussels.Theautomaticcontrolsarebeingremovedfromthesepumps,thusnecessitatinglocalmanualactiontoinitiatetheiroperation.Attachment1providesadetaileddescriptionoftheproposedchanges,thejustificationforthechanges,andourproposeddeterminationofnosignificanthazardsconsiderationperformed.+BAAL.~92022001589202i2PDRADOCK05000315PPDR 0Ial~~7,e>>
Dr.T.E.Murley-2-AEP:NRC:0692CCpursuantto10CFR50.92.Attachment2containstheexistingpagesmarkedtoreflecttheproposedchanges.Attachment3containstheproposedT/Sspages.TheproposedT/SschangesarebasedonWestinghouseStandardT/S3/4,7.11.Wewouldappreciateyourstaff'sexpeditiousreviewofthissubmittaltosupportoperationofthenewsystembyMarchof1993.IftheproposedT/Ssarenotapprovedbythen,wewouldfurthersubjectourselvestomusselinfestation,sincethezebramusselbreedingseasonbeginsinthespringofeachyear.Webelievethattheproposedchangeswillnotresultin(1)asignificantchangeintheamountsofanyeffluentthatmaybereleasedoffsite,or(2)asignificantincreaseinindividualorc'umulativeoccupationalradiationexposure.TheproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommitteeandbytheNuclearSafetyandDesignReviewCommittee.Incompliancewiththerequirementsof10CFR50.91(b)(l),copiesofthisletteranditsattachmentshavebeentransmittedtoMr.J.R.PadgettoftheMichiganPublicServiceCommissionandtotheMichiganDepartmentofPublicHealth.ThisdocumenthasbeenpreparedfollowingCorporateproceduresthatincorporateareasonablesetofcontrolstoensureitsaccuracyandcompletenesspriortosignatureoftheundersigned.Sincerely,pmE.E.FitzparickVicePresidentAttachmentscc:D.H.Williams,Jr.A.A.Blind-BridgmanJ.R.PadgettG.CharnoffA.B.Davis-RegionIIINRCResidentInspector-BridgmanNFEMSectionChief lI~~
Attachment1toAEP:NRC:0692CC10CFR50.92AnalysisforChangestotheDonaldC.CookNuclearPlantUnits1'and2TechnicalSpecifications III~VaP Attachment1toAEP:NRC:0692CC1.0SECTXONSTOBECHANGEDPage1TechnicalSpecifications'(T/Ss)3/4.7.9forUnits1and2.2.0EXTENTOFCHANGEWeproposetomodifyT/Ss3/4.7.9toreflectthedesignchangesinthefiresuppressionwatersystem.TheT/Ssarebeingrevisedtoupdatethenumberoffiresuppressionpumpsinthesystemfromfour2000gpmpumpscommontobothunitstothree2500gpmpumpsthattakesuctionfromdedicatedfirewatertanksandtwo2000gpmpumpsthattakesuctionfromLakeMichigan.Allfivepumpsinthenewconfigurationarecommontobothunits.Also,weproposetoaddaLimitingConditionforOperationthatrequiresseparatewatersupplytanks,eachwithaminimumusablevolumeof565,000gallons.Finally,weproposetomakechangesintheactionandsurveillancerequirementstoreflecttheadditionofthetanksandnewpumps.3.0CHANGESREUESTEDWeareproposingtomakethefollowingchangestobothUnit1andUnit2T/S3/4.7.9.RevisetheLimitinConditionfor0erationtoReflecttheNewNumberofPumsandtheAdditionofTwoFireWaterTanks.Currently;theLimitingConditionforOperationreadsasfollows:3.7,9.1ThefiresuppressionwatersystemshallbeOPERABLEwith:a.Twohighdemand2000GPMpumps,oneofwhichshallbeadieseldrivenpump,withtheirdischargealignedtothefiresuppressionheader.b.AnOPERABLEopenflowpathcapableoftakingsuctionfromLakeMichiganandtransferringthewaterthroughdistributionpiping(withOPERABLEsectionalizingvalves)up"to'heyardhydrantcurbcontrolvalvesanduptothehosestationvalve(s)orwatersuppressionsystemcontrollingvalve(s)requiredtobeOPERABLEperSpecifications3.7.9.5and3.7.9.2,respectively.FourHighDemandFirePumps(twoperunit)aresharedbetweenUnits1and2.
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..Attachment1toAEP:NRC:0692CCPage2WeproposetomodifytheT/Sasfollows:3.7.9.1ThefiresuppressionwatersystemshallbeconsideredtobeOPERABLEwith:a.ThreeofthefivefiresuppressionsystempumpsOPERABLE,twoofwhichmustbethefollowing:Onediesel-engine-drivenpumphavingacapacityof2500gpmcapableoftakingsuctionfromeitherofthefirewaterstoragetanks,withitsdischargealignedtothefiredistributionpiping.2.Onefiresuppressionsystempumphavingacapacityof2000gpmcapableoftakingsuctionfromLakeMichigananditsdischargecapableofbeingmanuallyalignedtothefiredistributionpiping.b.'nOPERABLEflowpathcapableoftakingsuctionfromeitheroneofthefirewatertanksandtransferringthewaterthroughdistributionpiping(withOPERABLEsectionalizingvalves)uptotheyardhydrantcurbcontrolvalvesanduptothehosestationvalve(s)orwatersuppressioncontrollingvalve(s).Thehosestationvalve(s)andthewatersuppressionsystemcontrollingvalve(s)thatarerequiredtobeintheflowpatharegiveninSpecifications3.7.9.5and3.7.9.2,respectively.C~Twofirewatertanks,eachwithaminimumusablevolumeof565,000gallons(34.0feetlevelindication).d.AnOPERABLEisolatedflowpathcapableoftakingsuctionfromLakeMichiganandtransferxingthewaterthroughdistributionpiping(withOPERABLEsectionalizingvalves)uptotheyardhydrantcurbcontrolvalvesanduptothehosestationvalve(s)orwatersuppressionsystemcontrollingvalve(s).Thehosestationvalve(s)andwatersuppressionsystemcontrollingvalve(s)thatarerequiredtobeOPERABLEaregiveninSpecifications3.7.9.5and3.7.9.2respectively,ReviseActionStatementaCurrentlyT/S3.7.9.1ActionStatement(a),forbothunits,states:WithonlyonepumpOPERABLE,restoreaninoperablepump(di.esel,ifrequired),andequipmenttoOPERABLEstatuswithin7daysorestablishabackupfiresuppressionsystemwithinthenext7days.TheprovisionsofSpecifications3.0.3and3.0.4arenotapplicable.Weareproposingtoamendthisactionstatementtostate:WithlessthantheminimumnumberofpumpsOPERABLE,taketheACTIONshowninTable3.7-5.
~Je41tl%"lt4Q'7~VWp44I.IjibP' Attachment1to.AEP:NRC:0692CCPage3AscanbeseeninAttachment3,Table3.7-5specifiestherequiredactionsto,betakenbased,onthe.numberandtypeofpumpsavailable.AddanewActionStatementbtoAddressanInoerableFireWaterTankThenewactionstatementisproposedasfollows:Withonefirewaterstoragetankinoperable,restoretheinoperabletanktoOPERABLEstatuswithin30daysorestablishabackupfiresuppressionwatersystemwithinthenext7days.BecauseofthenewActionStatement(b),theexistingActionStatement(b)willberenumberedto(c).AddanewActionStatementdRatherthanreiteratethefollowingstatementineachactionstatement,we.areproposingtostateitgustonceasitem(d):Theprovisionsof,.Specifications3.0.3and3.0.4arenotapplicable.AddaNewSurveillanceReuirementfortheFireWaterTansWeareproposingtoaddthefollowingnewsurveillancerequirementforthefirewaterstoragetanks:(a)At'leastonceper7daysbyverifyingthewatersupplycontainedinthefirewatertanks.Becausethenewsurveillancerequirementwaslabeledas(a),thesubsequentsurveillancerequirementshavebeenrelabeled.ModifExistinSurveillanceReuiremente2toAddresstheew2500m~PurasCurrentlySurveillanceRequiremente(2)states:Atleastonceper,18monthsbyperformingasystemfunctionaltestwhichincludessimulatedautomaticactuationofthesystemthroughoutitsoperatingsequence,and:Verifyingthateachpumpdevelopsaflowofatleast2000gpmatasystemheadofatleast300feetofwaterbyobservingthreepoints(minimum,rated,andpeak)onthepump'sperformancecurve.Weareproposingtomodifythesurveillancerequirementtospecificallyaddressthepumpsthattakesuctionfromthefirewatertanks.Theflowrateforthesepumpsis2500gpm,ratherthan2000gpmasstatedinthecurrentT/S.Thenewsurveillancerequirement,whichisrelabeledasf(2),willreadasfollows:
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-Attachment1toAEP:NRC:0692CCPage4Atleastonceper18monthsbyperformingasystemfunctionaltest,which,includessimulatedautomaticactuationofthesystemthroughoutitsoperatingsequence,and:Verifyingthateachpumpthattakessuctionfromthefirewatertanksdevelopsaflowofatleast2500gpmatasystemheadofatleast300feetofwaterbyobservingthreepoints(minimum,rated,andpeak)onthepump'sperformancecurve.ChaneSurveillanceReuirementstoReflectMultileDieselFuelOilTanksWeareproposingtousethepluralformofseveralwordsinSurveillanceRequirements4.7.9.1.2and4.7.9.1.3,toreflectmultipledieselfueloiltanks,firepumpdieselengines,batterybanks,andchargers.AddaNewSurveillanceReuirementtoSecificallAddressTestinforthePumsthattakeSuctionfromLakeMichianCurrentlySurveillanceRequiremente(2)states:Atleastonceper18monthsbyperformingasystemfunctionaltestwhichincludessimulatedautomaticactuationofthesystemthroughoutitsoperatingsequence,and:Verifyingthateachpumpdevelopsaflowofatleast2000gpmatasystemhead'ofatleast300feetofwaterbyobservingthreepoints(minimum,rated,andpeak)onthepump'sperformancecurve.Sincetheinstrumentationthat,wouldinitiateautomaticactuationofthesepumpsisbeingremoved,anewsurveillancerequirement,whichisnumbered(g),states:Atleastonceper18monthsbyverifyingthateachpumpthattakessuctionfromLakeMichigandevelopsaflowofatleast2000gpmatasystemheadofatleast300feetofwaterbyobservingthreepoints(minimum,ratedandpeak)onthepump'sperformancecurve,RevisetheBasestoRefecttheNewSstemThefollowingfourparagraphsarebeingaddedtoBasesSection3/4,7.9:Thefiresuppressionwatersystemhasfivefiresuppressionsystempumpscommontobothunitswhichdischargeintoundergroundringheaders.Therearetwodiesel-engine-driven,vertical-turbinefirepumpsratedat2000gpm,eachtakingsuctionfromLakeMichigan;onemotor-drivenhorizontalcentrifugalfirepumpratedat2500gpmthattakessuctionfromthefirewaterstoragetanks;andtwodiesel-engine-drivenhorizontalcentrifugalfirepumpsratedat2500gpmthattakesuctionfromthefirewaterstoragetanks.Havingacombinationofdiesel-drivenandelectric-motor-drivenpumpsinthe kVQh5ph~ca'Irl~fU~ck'IVI4fV'VII-C~tv~s<<~
AttachmentltoAEP:NRC:0692CCPage5systemdesignisconsistentwithNRCBranchTechnicalPositionAPSCB9.5-1.Requiringoneofthe2000gpmdiesel-engine-drivenpumpsthattakessuctionfromLakeMichiganandoneofthe2500gpmdiesel-drivenpumpsthattakessuctionfromafirewaterstoragetanktobeOPERABLEensuresthecapabilityofobtainingwaterfrombothsources.Thisconservatismresultsinenhancedsystemreliabilityandreducedriskfromexternalevents.TechnicalSpecification,3.7.9.1requiresthreefirewatersuppressionsystempumpstobeOPERABLEforthefiresuppressionwatersystemtobeOPERABLE.Oneofthesepumpsmustbea2500gpmdiesel-drivenpumpcapableoftakingsuctionfromeitherfirewaterstoragetankandonea2000gpmfiresuppressionpumpcapableoftakingsuctionfromLakeMichigan.Thethirdpumpmaytakesuctionfromeitherwatersource.Theflowpathscapableof.takingsuctionfromLakeMichiganarenormallyisolatedtoprecludezebramusselinfestationofthesystem.Inaddition,thefollowingsentenceisbeingadded:Intheeventthatthefirewatertanksbecomeinoperable,LakeMichiganmayserveasitsbackup.RevisetheBases~Section347.9tomaketheBasesConsistentBetweenUnitsThefollowingisbeingdeletedfromUnit2BasespageB3/47-7:othertasks(e.g.,anoperatorontour)providedthatsuchpersonnelfulfilledtheabovestatedrequirements.Asaminimum,eachareaaffectedbyanisolatedlowpressureCO~systemmustbevisitedeverytwenty-five(25)tothirty-five(35)minutesbytheRovingFireWatchPatrol,Suchmeasureswillprovidethenecessaryleveloffireprotectionwhileaffordingnecessaryprovisionsforpersonnelsafety.Intheeventthefiresuppressionwatersystembecomesinoperable,immediatecorrectivemeasuresmustbetakensincethissystemprovidesthemajorfiresuppressioncapabilityoftheplant,Therequirementforatwenty-fourhour.reporttotheCommissionprovidesforpromptevaluationoftheacceptabilityofthecorrectivemeasurestoprovideadequatefiresuppressioncapabilityforcontinuedprotectionofthenuclearplant.Thesestatementsarenolongerapplicable,andhavealreadybeendeletedfromUnit1.
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.Attachment,.ltoAEP:NRC:0692CC4.0DISCUSSIONPage6JustificationforChaneThefunctionofthefireprotectionwatersystemistocontrolandextinguishfiresintheplant.Thisiscurrentlyaccomplishedbyanunlimitedwatersupply(LakeMichigan),firepumps,pipingnetwork,manualhosestandpipes,automaticoperatingvalves,controlequipment,distributionnozzlesandotherhardware.However,thewaterfromLakeMichiganisinfestedwithzebramussels,whichwould,ifleftuncontrolled,.infestthefireprotectionwatersystempiping.Themethodscurrentlyavailabletokillzebramusselsarelaborintensiveandcomplicatedtoimplement.Consequently,wedecidedtodesignasourceofwaterindependentofthelakewhilecontinuingtoresearchanyothersuccessfuldevelopmentstoresolvethezebramusselproblem.JustificationforProosedActionStatementsWeareproposingthat,withlessthantheminimumnumberofpumps,OPERABLE,theactionshowninTable3.7-5betaken.Currently,ourT/Ssallowussevendaystoreturninoperablepumpstoservice.Wearemaintaining,this,seven-daytimerestrictionininstances'inwhichwehaveaminimumof-twopumpsoperable.However,ininstancesinwhichwehaveonlyone.pumpoperable,weareallowingfourdaystoreturnaninoperablepumptoservice.Sinceweneedat,leasttwo.pumpstoextinguishourworst"casefirehazard,as'describedintheFireProtectionProgramManual-(FPPM),wehavedecidedthatourT/Ssshouldrequirethesecondpumptobereturnedtooperablestatusasexpeditiouslyaspossible.Ininstancesinwhichwehavethreepumps,butnotthecorrectcombinationtomeettherequirementsspecifiedinthelimitingcondition-ofoperation(LCO),weareproposingatimelimitof14daystoreturnaninoperablepumptooperable'status.Sincewealreadyhaveonemorefiresuppressionsystempumpoperablethanweneedtoextinguishtheworstcasefirehazard,thesafetysignificanceofnothavingthecombinationofpumpsspecifiedintheLCOisrelativelysmall.Consequently,weareproposingaslightlylessstringentactionstatementinthisinstance.CurrentSstemDescritionGeneralDesignBasisThefireprotectionwaterflowmayvaryfrom30to65gpmforasinglesprinklerheadinoperationtoasmuchas4700gpmforthecombinedflow,includinghosestreams,fortheUnit1maintransformerandturbinebuildingwallexposuresystems.Consequently,itisnotpracticaltotrytomeetthisrangeofwaterflowwithasinglefirepump.Accordingly,thefiresuppressionsystemshavebeendividedintothosehavinglowwaterdemandandthosewithmuchlargerwaterdemands.Thesesystemshavebeenidentifiedasthe"lowdemandfiresystem"andthe"highdemandfiresystem."Collectivelytheyarereferredtoasthe"emergencyfiresystem."
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...Attachment.ltoAEP:NRC:0692CCPage7WaterSupplyThesourceofwaterforthefireprotectionwatersystemisLakeMichigan.FirePumpsTwohorizontal,centrifugal,electric-motor-drivenfirepumpsareprovidedforhighdemandfires.Thesepumpsaredesignedtostartimmediatelyupona"highdemandfire"signalorwithvaryingtimedelaysifadditionalcapacityisneededforlowdemandfires.Eachpumpisdrivenbya300-horsepowermotorandratedat2000gpmat152psi.Suctionisfromthenonessentialservicewater.(NESW)suctionheader,whichdrawsfrom.thecirculatingwaterdischargetunnelofeachunit.Onemotor-drivenpumpisprovidedforeachunit.Twodiesel-engine-driven,verticalturbinefirepumpsarealsoprovidedforhighdemandfiresintheeventofacompletepowerfailureorforadditional.capacity.Eachpumpisdrivenbya325-horsepowerengineandratedat2000gpmat152psi;Suctionisfromthecirculatingwaterintakechamberbehindthetravellingscreensinthescreenhouse.Onehorizontal,centrifugal,electric-motor-drivenfirepumpisprovidedforthelowdemandsystem.Thispumpisdesignedtostartimmediately'upona"lowsystempressure"signal.Thispumpisdrivenbya100-horsepowermotorandratedat500gpmat152psi.SuctionisfromtheUnit1"NESWsuctionheaderwhichdraws.fromthecirculatingwaterdischargetunnel.Thispumpislo'catedinUnit1,butservesbothunits.Althoughthis.pumpisbeingremoved,therearenoT/Ssrequirementsonthispump.Onehorizontal,centrifugal,electric-motor-drivenjockeypumpisprovidedtopressurizethefiresystempiping.Thepumpisdrivenbya10-horsepowermotorandratedat50gpmat76psi.Suction,is'romtheUnit1NESWpumpdischarge.Althoughthispumpisbeingremoved,thereare,noT/Ssrequirementsonthispump.FixePipingThefirepumpsdischargeintoundergroundringheadersaroundtheoutsideoftheplantandintotheinteriorringheaderintheturbinebuilding.Theoutsideheadersconsistof12-inchClass200asbestos-cement,,*andductileironpipe.A10-inchweldedsteelinteriorloopheaderislocatedintheturbineandscreenhousebuildings.Thisinteriorheaderisconnectedtotheoutdoorloopheaderbyvalvedconnectionsroutedthroughtheservicebuilding,auxiliarybuildingandtheyard.Thisarrangementformsaseriesofsmallerinterior/exteriorloopsconnectedthroughisolatingvalvestoensureflowfrommultipledirections.
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...Attachmentl,to,AEP.:NRC:0692CCCurrentSstem0erationPage8HighDemandFireSystemWhenaninitiatingdeviceforahighdemandfiresyst:emisoperated,itsendsanelectricsignaltothefirepumplogicsystemandthesequencetostarttheelectric-motor-drivenfirepumpforthatunitisbegun.Ifmorethanonesuppressionsystemoperatesatatime,additionalcapacitymaybeneeded.Ifthisisthecase,theheaderpressurewilldecrease.Anelectricalcontactwillcloseapressureswitchwhentheheaderpressuredropsto140psi.Thistheninitiatesthestartinglogicfortheelectric-motor-drivenfire-pumpfortheoppositeunit.Bothpumpsaredesignedtolock-insothattheywillnotstartandstopasthepressureincreasesanddecreases.Reliefvalvesopenintheeventthatsystempressurebecomesexcessive.Ifforsomereasonthepressuredropsbelow120psi,oneofthediesel-engine-drivenpumpswillstart.Ifdemandisstillnotmet,thentheotherdiesel-engine-drivenfirepumpwillstart.Therearealsoprovisionstolocallystartandstopeachelectric-motor-drivenanddiesel-engine-drivenpump.LowDemandFireSystemA500gpm,pumplocatedinUnit1hasbeenprovidedforthelowdemand,firesystem.Whena,pressuredropnotassociatedwiththehighdemandlogicoccurs,apressureswitchwillinitiatetheemergencyfiresystemlogictoenergizethelowdemandfiresystem.The500gpmfirepumpwillimmediatelystart.Anylowdemandfiresystemactuationwillalsoautomaticallyputthehighdemandfiresystem'selectric-motor-drivenanddiesel-engine-drivenfirepumpsonemergencystandby.Eventhoughthe.high.demandfiresystemwouldeventuallystartthetwodiesel-engine-drivenfirepumps,thelowdemandsystemmakesdirectprovisionforstartingthem.NewSstemDescritionDesignBasisofNewSystemInselectingthecapacityandquantityoffirepumpsrequiredforanadequatefiresuppressionwatersupply,anumberoffactorsweretaken,intoconsideration.Someofthesefactorsareasfollows:Therequirementsofthelargestsinglefirehazard.Thenumberofprotectedhazardswhichmightbeexpectedtobeinvolvedinagivenfireandthetotalwaterflowrequiredifallareinvolved.oTheaveragewaterdemandrequiredforhoselinesorsmallsprinklersystems.
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,.-.Attachment.l..to,AEP:NRC:,0692CCPage9oThepumpheadnecessarytosupplytheautomaticsystem(orhoseoutlets)atthehighestandmosthydraulicallyremotelocationsintheplant.oReliabilityoftheelectricalsourcesupplyingtheelectric-motor-drivenfirepumps.oThepotential,althoughunlikely,catastrophicfailureofthefirewatertankscreatingthescenarioofnosourceofwaterbeingavailableforfiresuppression.Thefirewaterstoragetankshavebeenseismicallydesignedtoconformto.UniformBuildingCodeZone1requirements..Consequently,although-theyarenotSeismicClassI,thetankswillwithstandanearthquakeofamagnitudethatmaybeexpectedinthiszone.ThereisnorequirementtobuildthissystemasSeismicClassI.AspartofourAugust19,1977submittalthattransmittedresponsestoNRCquestionsonfireprotectionatCookNuclearPlant;weprovidedseveralhanddrawnsketches.Thesesketchesindicatedthattheloadspoweredbythe4Kvsource,includingtheexistingelectricmotor-drivenfirepumps,areontheemergencydieselgenerators.However,wedonotintendfor-thenewelectric-motor-drivenpumptobeloadedontotheemergencydieselgenerator.Thenewdesignhasfourdiesel-engine-drivenpumpsthat-.arecapableofsupplyingfireprotectionwaterintheeventofalossofoffsite.power.To.addressthe.scenarioofafireandsimultaneouslossofoffsitepower,theproposedT/Ssrequirethattwooutofthethreepumpsthatmustbeoperableforthesystemtobeoperablebediesel-engine-driven.Sinceonlytwopumpsareneededtoextinguishourworstcasefirehazard,wewillhaveamplefireextinguishingcapabilityevenintheeventofalossofoffsitepower.FireWaterStorageTanksandWaterSupplyThefunctionofthededicatedfireprotectionwatersystemistoprovidea.reliablesupplyofcleanwatertotheplant'sfiresuppressionsystems.Thiswillbeaccomplishedbydedicatedfirewaterstoragetanks,firepumps,andapipingnetwork,Thiswatersupplysystemwilltieintotheexistingundergroundringheader.Twofirewaterstoragetankswillbeerected,eachlargeenoughtoextinguishthelargestexpecteddesignbasisfireatCookNuclearPlant.Suctionwillbetakenoffofonlyonetankatatime.Thethreepumpsbeinginstalledtotakesuctionfromthesetanksarecommontobothtanks.Motor-operatedbutterflyvalveswillworkincon]unctionwithwaterlevelgaugestokeepthewaterlevelbetween612,400gallonsand621,000gallons.ThisshouldensurecompliancewiththeproposedT/Ssrequirementofa..minimum.usablevolumeof565,000gallons,whichisequivalenttoalevelindicationof34feet.ThisproposedT/SsrequirementistheamountofwaterneededtoextinguishthelargestsinglefirehazardasdescribedintheFPPM.
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.....,..Attachmentl,.toAEP:NRC:0692CCPage10Normally,make-upwatertothetankswillcomefromtheplant'sconnectiontotheLakeTownship,watersupply.However,BranchTechnicalPositionAPSCB9.5-1requiresthatbothtanksbecapableofbeingrefilledinaminimumofeighthours.Ifthetanksarenearlyempty,thenrefillingtheminaminimumofeighthoursfromtheLakeTownshipwatersupplywilloverburdentheplant'scleanwatersupplysystem.Consequently,inthisevent,thetankswillbefilledwithwaterfromLakeMichigan.Intheeventthatthetanksarerefilledwithlakewater,thewaterwillbeimmediatelytreatedtokillzebramussels.Theonlytimethatweenvisionthisoccurringissubsequenttoextinguishingamajorfirethatwoulddrainthetanks.Refillingthetanksfollowingroutinesurveillances,testingandsmallfireswouldnotdrainthemtoalevelthatwouldnecessitatetheuseofLakeMichiganwater.InaccordancewithAppendixAtoBranchTechnicalPositionAPSCB9.5-1,eachtankwillhold100%ofthesystemcapacity.Assuch,onlyonetankisneededtoputouttheworstcasefire.FirePumps"Basedontheabove,three2500gpmfirepumps,twodiesel-drivenandoneelectric-motor-driven,willbeinstalledtopumpwaterfromthefirewaterstoragetanks.Inaddition,thetwo2000gpmdiesel-engine-drivenpumpsthattakesuctionfromLakeMichiganwillbemaintainedinordertomaintainthecapabilityofobtainingwaterfromLakeMichigan.Asaminimum,threeofthesefivepumpsmustbeoperableatanygiventime.;.Oneofthesethreepumpsmustbea2500gpmdiesel-engine-drivenpumpthat.takes.suctionoff.,ofthe.fire,.water.storagetanks.andonemustbea2000gpmdiesel-engine-drivenpumpthattakessuctionoffofLakeMichigan..Thethirdpumpmaybeanyoftheremainingpumpsinthesystem.Thesystemisdesignedsuchthatoneofthree2500gpmpumpswillstartimmediatelyuponasignalthatthelinepressureislessthan130psi.Ifthelinepressurecannotbemaintainedabove130psi,asecondpumpwillstart.ThisisconsistentwithNFPA20andisanenhancementoverouroldsystemdue'odesignsimplification.Twoofthe2500gpmfirepumpscansupplyenoughwaterforthelargestsinglefirehazard.Thethirdpumpisaredundantbackup,whichallowsustoisolateoneofthepumpsatanygiventimeatitselectricalpowersource.TomaintainthecapabilityofobtainingwaterfromLakeMichigan,twooftheexisting2000gpmdiesel-engine-drivenlakepumpsarebeingmaintained.Toprecludethesyst:emfrombecominginfestedwithzebramussels,thetwolakepumpswillbeisolatedfromtherestofthefireprotectiondistributionsystembyclosureofthefirstisolationvalvedownstreamofthepumps,evenduringsurveillancetesting,Thewateractuallypumpedbythelakepumpsduringsurveillancetestingwillbereturnedtotheforebayviaareturnline.Inaddition,theautomaticinitiatinginstrumentationonthepumpswillberemovedtoprecludeinadvertentoperationofthepumps.Thesepumpsmustbemanuallystartedlocally.
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,...Attachment1to,AEP,:NRC:0692CCPage11FirePipingThefirepumpsdischargeintoanundergroundringheaderwhichconnectstotheplant'sexistingfireprotectionundergroundpipingnetwork.DieselFuelOilTanksTheexistingdieselfueloiltanksthatsupplythepumpsthattakesuctionfromLakeMichiganwillbemaintained.Thesetanksarelocatedinthescreenhouse.Eachofthenewlyinstalleddieseldrivenpumpswillalsohaveitsown250-gallonfueloiltank.Eachofthesefueloiltankswillbe,located-,inaroominthenewlybuiltfiresuppressionwatersystempumphousewithitsassociatedpump.GeneralDesignCriteria3stipulatesthatnonewpotentialfirehazardwill'elocatedin,thevicinityofanystructures,systems,orcomponentsimportanttosafety.Assuchthepumphouseisremotefromanysafety-relatedequipment,althoughitisintherestrictedarea.Inaddition,tominimizeanypotentialfirehazardthatthefueloiltanksmaypose,.>>thewallsofthepumphouseroomwillbemadeofthree-hourfireratedmaterial.TheexistingT/Ssthataddressdieselfueloiltanksurveillanceswillbeapplicableto.both,the,newandtheexistingdieselfueloiltanks:.AsstipulatedintheT/Ss,only160gallonsoffuelneedtobecontainedineachofthesetanks.Thisistheamountoffuelneededtosupportpumpoperationforeighthours,asstipulatedintheNFPAcodes.Asanengineeringconservatismthenewtankshavebeensizedtohold90gallonsofadditionalfuel,5.0NOSIGNIFICANTHAZARDSDETERMINATIONWehaveevaluatedtheproposedT/SschangeandhavedeterminedthatitdoesnotrepresentasignificanthazardsconsiderationbasedonthecriteriaestablishedinlOCFR50.92(c).OperationoftheCookNuclearPlantinaccordancewiththeproposedamendmentwillnot:1InvolveasinificantincreaseintherobabilitorconseuencesofanaccidentreviouslevaluatedThenewlyinstalledfirewaterstoragetanksandtheirthreeassociatedpumpswillsupplyenoughwaterandpumpingcapabilitytobeabletoputoutthelargestsinglefirehazardevenifoneofthethreepumpsfail,whichisinaccordancewithBranchTechnicalPositionAPSCB9.5-1.MaintainingtwooftheexistingpumpsthattakesuctionoffofLakeMichiganisanaddedconservatismthatresultsinCookNuclearPlanthavingtwocompletelyseparateandindependentsourcesoffiresuppressionwater.Consequently,theproposedchangestotheCookNuclearPlantdesignandTechnical 00E~'rakvII~AV>f4'VYlieI~r,6ICEa\JI,lipg440-+,1*~~AeO8kII
,,....Attachment.1,to.AEP:NRC:0692CCPage12Specificationswillnotinvolveasignificantincreaseintheprobabilityor,consequencesof,anaccidentpreviouslyevaluated.2CreatetheossibilitoanewordifferentkindofaccidentfromanreviouslanalzedTheproposedsystemisdesignedinaccordancewith10CFR50AppendixAGeneralDesignCriterion3.Assuch,nonewpotentialfirehazardswillbelocatedinthevicinityofanystructures,systems,orcomponentsimportanttosafety.Inaddition,theeffectsofthefirewaterstoragetanksrupturinghavebeenanalyzedtoensurethatthesafetycapabilityofstructures,systems,orcomponentsimportanttosafetyisnotimpaired.Inaddition,byhavingthetwopumpsthattakesuctionfromLakeMichigan,wewillstillhaveareadilyavailablesourceoffiresuppressionwaterintheeventthatthetanksfail,Consequently,theproposedchangeswillnotcreatethepossibilityofanewordifferentkindofaccidentfromanypreviouslyanalyzed.3InvolveasinificantreductioninamarinofsafetThemarginof,safetywascarefullyconsideredinthedesignoftheproposedsyst:em.ItwasrealizedearlyinthedesignprocessthatifwedidnotmaintainthecapabilitytoobtainwaterfromtheLakeMichiganthen'heoverallmarginofsafetywouldbereducedfortworeasons.First,LakeMichiganisessentiallyan.infinitesourceofwaterandthetanksarenot.Second,ifbothtankscatastrophicallyfailed,nofiresuppressionwaterwouldexistuntilanalternatesourcewasestablished.Thenumberofpumpsisalsoimportanttothemarginofsafety.AlthoughonlythreepumpsareneededtomeettherequirementsofBranchTechnicalPositionAPSCB9.5-1,areductioninthenumberofpumpsfromfourintheexisting.systemtothreeinthenewsystemwouldalsoreducethemarginofsafety.However,zebramusselinfestationoftheexistingsystemalsoposesthepotentialtoreducethemarginofsafety.Therefore,itwasdecidedtoinstallanewsystemwithcleanwaterstoredintanksandtoalsomaintaintwooftheexistingdi.esel-engine-drivenlakepumpsinthenewsystemdesign.,InthismannerweaddressthezebramusselproblemandmaintainthecapabilityofobtainingwaterfromLakeMichigan.Vealsoincreasethenumberofpumpsfromfourintheexistingsystemtofiveinthenewsystem.Bykeepingthelakepumpsisolatedweeliminateanyconcernthatthe,.newportionofthesystemwillbecomeinfestedwithzebramussels.PeriodicallystartingthelakepumpsandflushingtheirdischargepipingpertheproposedT/Ssrequirements,andchemicallytreatingthepumpsanddischargepipingwillhelptoensure,that,they,will,bekeptoperationalandfreeofzebramussels.Byincreasingthenumberofpumps,havingdiversityinour,availablewatersources,andaddressingthezebramusselproblem,wehavenotonlyaddressedthedesignissuesthatmayhavepotentiallyreducedthemarginofsafety,buthaveactuallyincreasedthemarginofsafety.
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..Attachment1to.AEP:NRC:0692CCPage136.0PENDINGTSsPROPOSALSIMPACTINGTHISSUBMITTALNootherrequestsforchangestotheTechnicalSpecificationsforCookNuclearPlantthatarependingNRCrevievimpactthissubmittal.
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