ML17329A378

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Application for Amends to Licenses DPR-58 & DPR-74,changing TS 3/4.7.9.1 to Reflect Installation of Two Fire Protection Water Storage Tanks & Three Pumps to Supply Sufficient Quantity of Clean Water to Fire Suppression Sys
ML17329A378
Person / Time
Site: Cook  American Electric Power icon.png
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)
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Text

ACCELERATED DIS-UTIONDEMONSTIONSYSTEMREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9202200158 DOC.DATE:

92/02/12NOTARIZED:

NOFACIL:50-315 DonaldC.CookNuclearPowerPlant,Unit1,XndianaM50-316DonaldC.CookNuclearPowerPlant,Unit2,XndianaMAUTH.NAMEAUTHORAFFILIATION FITZPATRICK,E.

IndianaMichiganPowerCo.(formerly Indiana6MichiganRECIP.NAME RECIPIENT AFFILIATION MURLEY,T.E.

DocumentControlBranch(Document ControlDesk)DOCKET0500031505000316EleRD

SUBJECT:

Application foramendstoLicensesDPR-586DPR-74,changing TS3/4.7.9.1 toreflectinstallation oftwofireprotection waterstoragetanksEthreepumpstosupplysufficient quantityofcleanwatertofiresuppression sys.DISTRIBUTION CODE:AOOIDCOPIESRECEIVED'LTR JENCLgSIZE:5+0TITLE:ORSubmittal:

GeneralDistribution

/NOTES:RECIPIENT IDCODE/NAME PD3-1LASTANG,JCOPIESLTTRENCL1122RECIPIENT XDCODE/NAME PD3-1PDCOPIESLTTRENCL11ADDINTERNAL:

NRR/DET/ECMB 7DNRR/DOEA/OTSB1 1NRR/DST/SELB 7ENRR/DST/SRXB 8EOC/PFMBEE01EXTERNAL:

NRCPDR11111111101111NRR/DET/ESGB NRR/DST8E2NRR/DST/SICB8H7 NUDOCS-ABSTRACT OGC/HDS2RES/DSIR/EIB NSIC11111111101111DNOTETOALL"RIDS"RECIPIENTS:

DDPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!TOTALNUMBEROFCOPXESREQUIRED:

LTTR18ENCL16 1IlCvn C$~)tlIndianaMichiganPowerCompanyP.O.Box16631Coiumbus, OH43216lNSllllUll NICNECWNPQWMAEP;NRC:0692CC DonaldC.CookNuclearPlantUnits1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74TECHNICAL SPECIFICATIONS CHANGEREQUEST:FIREWATERSTORAGETANKSU.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555Attn:T.E.MurleyFebruary12,1992DearDr.MurleyThisletteranditsattachments constitute anapplication forchangestotheTechnical Specifications (T/Ss)forDonaldC,CookNuclearPlantUnits1and2inaccordance with10CFR50.90.Weareproposing toamendT/S3/47.9.1forbothunitstoreflecttheinstallation oftwofireprotection waterstoragetanksandthreepumpstosupplyasufficient quantityofclean,reliablewatertotheplant'sfiresuppression systems.Currently, theCookNuclearPlantfiresuppression systemissuppliedbyLakeMichigan.

However,inthelastfewyearszebramusselshavepropagated inLakeMichigan, posingathreattothereliability oftheexistingfireprotection system.Consequently, wehavedecidedtoerecttwodedicated fireprotection watertanks,whichwillprovideareliablesourceofcleanwatertothefireprotection system.Inaddition, theexisting2000gpmdiesel-engine drivenpumpswillbemaintained tofacilitate thecapability ofobtaining waterfromLakeMichigan.

However,thesepumpsandtheirassociated pipeswillbeisolatedfromtherestofthefireprotection watersystemtoprecludethepossibility ofinfesting thefireprotection watersystemwithzebramussels.Theautomatic controlsarebeingremovedfromthesepumps,thusnecessitating localmanualactiontoinitiatetheiroperation.

Attachment 1providesadetaileddescription oftheproposedchanges,thejustification forthechanges,andourproposeddetermination ofnosignificant hazardsconsideration performed

.+BAAL.~9202200158 9202i2PDRADOCK05000315PPDR 0Ial~~7,e>>

Dr.T.E.Murley-2-AEP:NRC:0692CC pursuantto10CFR50.92.Attachment 2containstheexistingpagesmarkedtoreflecttheproposedchanges.Attachment 3containstheproposedT/Sspages.TheproposedT/SschangesarebasedonWestinghouse StandardT/S3/4,7.11.

Wewouldappreciate yourstaff'sexpeditious reviewofthissubmittal tosupportoperation ofthenewsystembyMarchof1993.IftheproposedT/Ssarenotapprovedbythen,wewouldfurthersubjectourselves tomusselinfestation, sincethezebramusselbreedingseasonbeginsinthespringofeachyear.Webelievethattheproposedchangeswillnotresultin(1)asignificant changeintheamountsofanyeffluentthatmaybereleasedoffsite,or(2)asignificant increaseinindividual orc'umulative occupational radiation exposure.

TheproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommittee andbytheNuclearSafetyandDesignReviewCommittee.

Incompliance withtherequirements of10CFR50.91(b)(l),

copiesofthisletteranditsattachments havebeentransmitted toMr.J.R.PadgettoftheMichiganPublicServiceCommission andtotheMichiganDepartment ofPublicHealth.Thisdocumenthasbeenpreparedfollowing Corporate procedures thatincorporate areasonable setofcontrolstoensureitsaccuracyandcompleteness priortosignature oftheundersigned.

Sincerely, pmE.E.FitzparickVicePresident Attachments cc:D.H.Williams, Jr.A.A.Blind-BridgmanJ.R.PadgettG.CharnoffA.B.Davis-RegionIIINRCResidentInspector

-BridgmanNFEMSectionChief lI~~

Attachment 1toAEP:NRC:0692CC 10CFR50.92 AnalysisforChangestotheDonaldC.CookNuclearPlantUnits1'and2Technical Specifications III~VaP Attachment 1toAEP:NRC:0692CC

1.0 SECTXONSTOBECHANGEDPage1Technical

Specifications

'(T/Ss)3/4.7.9forUnits1and2.2.0EXTENTOFCHANGEWeproposetomodifyT/Ss3/4.7.9toreflectthedesignchangesinthefiresuppression watersystem.TheT/Ssarebeingrevisedtoupdatethenumberoffiresuppression pumpsinthesystemfromfour2000gpmpumpscommontobothunitstothree2500gpmpumpsthattakesuctionfromdedicated firewatertanksandtwo2000gpmpumpsthattakesuctionfromLakeMichigan.

Allfivepumpsinthenewconfiguration arecommontobothunits.Also,weproposetoaddaLimitingCondition forOperation thatrequiresseparatewatersupplytanks,eachwithaminimumusablevolumeof565,000gallons.Finally,weproposetomakechangesintheactionandsurveillance requirements toreflecttheadditionofthetanksandnewpumps.3.0CHANGESREUESTEDWeareproposing tomakethefollowing changestobothUnit1andUnit2T/S3/4.7.9.RevisetheLimitinCondition for0erationtoReflecttheNewNumberofPumsandtheAdditionofTwoFireWaterTanks.Currently; theLimitingCondition forOperation readsasfollows:3.7,9.1Thefiresuppression watersystemshallbeOPERABLEwith:a.Twohighdemand2000GPMpumps,oneofwhichshallbeadieseldrivenpump,withtheirdischarge alignedtothefiresuppression header.b.AnOPERABLEopenflowpathcapableoftakingsuctionfromLakeMichiganandtransferring thewaterthroughdistribution piping(withOPERABLEsectionalizing valves)up"to'heyardhydrantcurbcontrolvalvesanduptothehosestationvalve(s)orwatersuppression systemcontrolling valve(s)requiredtobeOPERABLEperSpecifications 3.7.9.5and3.7.9.2,respectively.

FourHighDemandFirePumps(twoperunit)aresharedbetweenUnits1and2.

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..Attachment 1toAEP:NRC:0692CC Page2WeproposetomodifytheT/Sasfollows:3.7.9.1Thefiresuppression watersystemshallbeconsidered tobeOPERABLEwith:a.Threeofthefivefiresuppression systempumpsOPERABLE, twoofwhichmustbethefollowing:

Onediesel-engine-driven pumphavingacapacityof2500gpmcapableoftakingsuctionfromeitherofthefirewaterstoragetanks,withitsdischarge alignedtothefiredistribution piping.2.Onefiresuppression systempumphavingacapacityof2000gpmcapableoftakingsuctionfromLakeMichigananditsdischarge capableofbeingmanuallyalignedtothefiredistribution piping.b.'nOPERABLEflowpathcapableoftakingsuctionfromeitheroneofthefirewatertanksandtransferring thewaterthroughdistribution piping(withOPERABLEsectionalizing valves)uptotheyardhydrantcurbcontrolvalvesanduptothehosestationvalve(s)orwatersuppression controlling valve(s).

Thehosestationvalve(s)andthewatersuppression systemcontrolling valve(s)thatarerequiredtobeintheflowpatharegiveninSpecifications 3.7.9.5and3.7.9.2,respectively.

C~Twofirewatertanks,eachwithaminimumusablevolumeof565,000gallons(34.0feetlevelindication).

d.AnOPERABLEisolatedflowpathcapableoftakingsuctionfromLakeMichiganandtransferxing thewaterthroughdistribution piping(withOPERABLEsectionalizing valves)uptotheyardhydrantcurbcontrolvalvesanduptothehosestationvalve(s)orwatersuppression systemcontrolling valve(s).

Thehosestationvalve(s)andwatersuppression systemcontrolling valve(s)thatarerequiredtobeOPERABLEaregiveninSpecifications 3.7.9.5and3.7.9.2respectively, ReviseActionStatement aCurrently T/S3.7.9.1ActionStatement (a),forbothunits,states:WithonlyonepumpOPERABLE, restoreaninoperable pump(di.esel, ifrequired),

andequipment toOPERABLEstatuswithin7daysorestablish abackupfiresuppression systemwithinthenext7days.Theprovisions ofSpecifications 3.0.3and3.0.4arenotapplicable.

Weareproposing toamendthisactionstatement tostate:WithlessthantheminimumnumberofpumpsOPERABLE, taketheACTIONshowninTable3.7-5.

~Je41tl%"lt4Q'7~VWp44I.IjibP' Attachment 1to.AEP:NRC:0692CC Page3AscanbeseeninAttachment 3,Table3.7-5specifies therequiredactionsto,betakenbased,onthe.numberandtypeofpumpsavailable.

AddanewActionStatement btoAddressanInoerableFireWaterTankThenewactionstatement isproposedasfollows:Withonefirewaterstoragetankinoperable, restoretheinoperable tanktoOPERABLEstatuswithin30daysorestablish abackupfiresuppression watersystemwithinthenext7days.BecauseofthenewActionStatement (b),theexistingActionStatement (b)willberenumbered to(c).AddanewActionStatement dRatherthanreiterate thefollowing statement ineachactionstatement, we.areproposing tostateitgustonceasitem(d):Theprovisionsof,.Specifications 3.0.3and3.0.4arenotapplicable.

AddaNewSurveillance ReuirementfortheFireWaterTansWeareproposing toaddthefollowing newsurveillance requirement forthefirewaterstoragetanks:(a)At'leastonceper7daysbyverifying thewatersupplycontained inthefirewatertanks.Becausethenewsurveillance requirement waslabeledas(a),thesubsequent surveillance requirements havebeenrelabeled.

ModifExistinSurveillance Reuiremente2toAddresstheew2500m~PurasCurrently Surveillance Requirement e(2)states:Atleastonceper,18monthsbyperforming asystemfunctional testwhichincludessimulated automatic actuation ofthesystemthroughout itsoperating

sequence, and:Verifying thateachpumpdevelopsaflowofatleast2000gpmatasystemheadofatleast300feetofwaterbyobserving threepoints(minimum, rated,andpeak)onthepump'sperformance curve.Weareproposing tomodifythesurveillance requirement tospecifically addressthepumpsthattakesuctionfromthefirewatertanks.Theflowrateforthesepumpsis2500gpm,ratherthan2000gpmasstatedinthecurrentT/S.Thenewsurveillance requirement, whichisrelabeled asf(2),willreadasfollows:

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-Attachment 1toAEP:NRC:0692CC Page4Atleastonceper18monthsbyperforming asystemfunctional test,which,includessimulated automatic actuation ofthesystemthroughout itsoperating

sequence, and:Verifying thateachpumpthattakessuctionfromthefirewatertanksdevelopsaflowofatleast2500gpmatasystemheadofatleast300feetofwaterbyobserving threepoints(minimum, rated,andpeak)onthepump'sperformance curve.ChaneSurveillance Reuirements toReflectMultileDieselFuelOilTanksWeareproposing tousethepluralformofseveralwordsinSurveillance Requirements 4.7.9.1.2 and4.7.9.1.3,to reflectmultipledieselfueloiltanks,firepumpdieselengines,batterybanks,andchargers.

AddaNewSurveillance ReuirementtoSecificall AddressTestinforthePumsthattakeSuctionfromLakeMichianCurrently Surveillance Requirement e(2)states:Atleastonceper18monthsbyperforming asystemfunctional testwhichincludessimulated automatic actuation ofthesystemthroughout itsoperating

sequence, and:Verifying thateachpumpdevelopsaflowofatleast2000gpmatasystemhead'ofatleast300feetofwaterbyobserving threepoints(minimum, rated,andpeak)onthepump'sperformance curve.Sincetheinstrumentation that,wouldinitiateautomatic actuation ofthesepumpsisbeingremoved,anewsurveillance requirement, whichisnumbered(g),states:Atleastonceper18monthsbyverifying thateachpumpthattakessuctionfromLakeMichigandevelopsaflowofatleast2000gpmatasystemheadofatleast300feetofwaterbyobserving threepoints(minimum, ratedandpeak)onthepump'sperformance curve,RevisetheBasestoRefecttheNewSstemThefollowing fourparagraphs arebeingaddedtoBasesSection3/4,7.9:Thefiresuppression watersystemhasfivefiresuppression systempumpscommontobothunitswhichdischarge intounderground ringheaders.Therearetwodiesel-engine-driven, vertical-turbine firepumpsratedat2000gpm,eachtakingsuctionfromLakeMichigan; onemotor-driven horizontal centrifugal firepumpratedat2500gpmthattakessuctionfromthefirewaterstoragetanks;andtwodiesel-engine-driven horizontal centrifugal firepumpsratedat2500gpmthattakesuctionfromthefirewaterstoragetanks.Havingacombination ofdiesel-driven andelectric-motor-driven pumpsinthe kVQh5ph~ca'Irl~fU~ck'IVI4fV'VII-C~tv~s<<~

Attachment ltoAEP:NRC:0692CC Page5systemdesignisconsistent withNRCBranchTechnical PositionAPSCB9.5-1.Requiring oneofthe2000gpmdiesel-engine-driven pumpsthattakessuctionfromLakeMichiganandoneofthe2500gpmdiesel-driven pumpsthattakessuctionfromafirewaterstoragetanktobeOPERABLEensuresthecapability ofobtaining waterfrombothsources.Thisconservatism resultsinenhancedsystemreliability andreducedriskfromexternalevents.Technical Specification,3.7.9.1 requiresthreefirewatersuppression systempumpstobeOPERABLEforthefiresuppression watersystemtobeOPERABLE.

Oneofthesepumpsmustbea2500gpmdiesel-driven pumpcapableoftakingsuctionfromeitherfirewaterstoragetankandonea2000gpmfiresuppression pumpcapableoftakingsuctionfromLakeMichigan.

Thethirdpumpmaytakesuctionfromeitherwatersource.Theflowpathscapableof.takingsuctionfromLakeMichiganarenormallyisolatedtoprecludezebramusselinfestation ofthesystem.Inaddition, thefollowing sentenceisbeingadded:Intheeventthatthefirewatertanksbecomeinoperable, LakeMichiganmayserveasitsbackup.RevisetheBases~Section 347.9tomaketheBasesConsistent BetweenUnitsThefollowing isbeingdeletedfromUnit2BasespageB3/47-7:othertasks(e.g.,anoperatorontour)providedthatsuchpersonnel fulfilled theabovestatedrequirements.

Asaminimum,eachareaaffectedbyanisolatedlowpressureCO~systemmustbevisitedeverytwenty-five (25)tothirty-five (35)minutesbytheRovingFireWatchPatrol,Suchmeasureswillprovidethenecessary leveloffireprotection whileaffording necessary provisions forpersonnel safety.Intheeventthefiresuppression watersystembecomesinoperable, immediate corrective measuresmustbetakensincethissystemprovidesthemajorfiresuppression capability oftheplant,Therequirement foratwenty-four hour.reporttotheCommission providesforpromptevaluation oftheacceptability ofthecorrective measurestoprovideadequatefiresuppression capability forcontinued protection ofthenuclearplant.Thesestatements arenolongerapplicable, andhavealreadybeendeletedfromUnit1.

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.Attachment,.lto AEP:NRC:0692CC

4.0 DISCUSSION

Page6Justification forChaneThefunctionofthefireprotection watersystemistocontrolandextinguish firesintheplant.Thisiscurrently accomplished byanunlimited watersupply(LakeMichigan),

firepumps,pipingnetwork,manualhosestandpipes, automatic operating valves,controlequipment, distribution nozzlesandotherhardware.

However,thewaterfromLakeMichiganisinfestedwithzebramussels,whichwould,ifleftuncontrolled,.

infestthefireprotection watersystempiping.Themethodscurrently available tokillzebramusselsarelaborintensive andcomplicated toimplement.

Consequently, wedecidedtodesignasourceofwaterindependent ofthelakewhilecontinuing toresearchanyothersuccessful developments toresolvethezebramussel problem.Justification forProosedActionStatements Weareproposing that,withlessthantheminimumnumberofpumps,OPERABLE, theactionshowninTable3.7-5betaken.Currently, ourT/Ssallowussevendaystoreturninoperable pumpstoservice.Wearemaintaining, this,seven-day timerestriction ininstances'in whichwehaveaminimumof-twopumpsoperable.

However,ininstances inwhichwehaveonlyone.pumpoperable, weareallowingfourdaystoreturnaninoperable pumptoservice.Sinceweneedat,leasttwo.pumpstoextinguish ourworst"case firehazard,as'described intheFireProtection ProgramManual-(FPPM),wehavedecidedthatourT/Ssshouldrequirethesecondpumptobereturnedtooperablestatusasexpeditiously aspossible.

Ininstances inwhichwehavethreepumps,butnotthecorrectcombination tomeettherequirements specified inthelimitingcondition

-ofoperation (LCO),weareproposing atimelimitof14daystoreturnaninoperable pumptooperable'status.

Sincewealreadyhaveonemorefiresuppression systempumpoperablethanweneedtoextinguish theworstcasefirehazard,thesafetysignificance ofnothavingthecombination ofpumpsspecified intheLCOisrelatively small.Consequently, weareproposing aslightlylessstringent actionstatement inthisinstance.

CurrentSstemDescritionGeneralDesignBasisThefireprotection waterflowmayvaryfrom30to65gpmforasinglesprinkler headinoperation toasmuchas4700gpmforthecombinedflow,including hosestreams,fortheUnit1maintransformer andturbinebuildingwallexposuresystems.Consequently, itisnotpractical totrytomeetthisrangeofwaterflowwithasinglefirepump.Accordingly, thefiresuppression systemshavebeendividedintothosehavinglowwaterdemandandthosewithmuchlargerwaterdemands.Thesesystemshavebeenidentified asthe"lowdemandfiresystem"andthe"highdemandfiresystem."Collectively theyarereferredtoasthe"emergency firesystem."

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...Attachment.l toAEP:NRC:0692CC Page7WaterSupplyThesourceofwaterforthefireprotection watersystemisLakeMichigan.

FirePumpsTwohorizontal, centrifugal, electric-motor-driven firepumpsareprovidedforhighdemandfires.Thesepumpsaredesignedtostartimmediately upona"highdemandfire"signalorwithvaryingtimedelaysifadditional capacityisneededforlowdemandfires.Eachpumpisdrivenbya300-horsepower motorandratedat2000gpmat152psi.Suctionisfromthenonessential servicewater.(NESW)suctionheader,whichdrawsfrom.thecirculating waterdischarge tunnelofeachunit.Onemotor-driven pumpisprovidedforeachunit.Twodiesel-engine-driven, verticalturbinefirepumpsarealsoprovidedforhighdemandfiresintheeventofacompletepowerfailureorforadditional.

capacity.

Eachpumpisdrivenbya325-horsepower engineandratedat2000gpmat152psi;Suctionisfromthecirculating waterintakechamberbehindthetravelling screensinthescreenhouse.

Onehorizontal, centrifugal, electric-motor-driven firepumpisprovidedforthelowdemandsystem.Thispumpisdesignedtostartimmediately'upon a"lowsystempressure" signal.Thispumpisdrivenbya100-horsepower motorandratedat500gpmat152psi.SuctionisfromtheUnit1"NESWsuctionheaderwhichdraws.fromthecirculating waterdischarge tunnel.Thispumpislo'catedinUnit1,butservesbothunits.Althoughthis.pumpisbeingremoved,therearenoT/Ssrequirements onthispump.Onehorizontal, centrifugal, electric-motor-driven jockeypumpisprovidedtopressurize thefiresystempiping.Thepumpisdrivenbya10-horsepower motorandratedat50gpmat76psi.Suction,is'romtheUnit1NESWpumpdischarge.

Althoughthispumpisbeingremoved,thereare,noT/Ssrequirements onthispump.FixePipingThefirepumpsdischarge intounderground ringheadersaroundtheoutsideoftheplantandintotheinteriorringheaderintheturbinebuilding.

Theoutsideheadersconsistof12-inchClass200asbestos-cement,,*

andductileironpipe.A10-inchweldedsteelinteriorloopheaderislocatedintheturbineandscreenhouse buildings.

Thisinteriorheaderisconnected totheoutdoorloopheaderbyvalvedconnections routedthroughtheservicebuilding, auxiliary buildingandtheyard.Thisarrangement formsaseriesofsmallerinterior/exterior loopsconnected throughisolating valvestoensureflowfrommultipledirections.

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...Attachment l,to,AEP.:NRC:0692CC CurrentSstem0erationPage8HighDemandFireSystemWhenaninitiating deviceforahighdemandfiresyst:emisoperated, itsendsanelectricsignaltothefirepumplogicsystemandthesequencetostarttheelectric-motor-driven firepumpforthatunitisbegun.Ifmorethanonesuppression systemoperatesatatime,additional capacitymaybeneeded.Ifthisisthecase,theheaderpressurewilldecrease.

Anelectrical contactwillcloseapressureswitchwhentheheaderpressuredropsto140psi.Thistheninitiates thestartinglogicfortheelectric-motor-driven fire-pumpfortheoppositeunit.Bothpumpsaredesignedtolock-insothattheywillnotstartandstopasthepressureincreases anddecreases.

Reliefvalvesopenintheeventthatsystempressurebecomesexcessive.

Ifforsomereasonthepressuredropsbelow120psi,oneofthediesel-engine-driven pumpswillstart.Ifdemandisstillnotmet,thentheotherdiesel-engine-driven firepumpwillstart.Therearealsoprovisions tolocallystartandstopeachelectric-motor-drivenanddiesel-engine-driven pump.LowDemandFireSystemA500gpm,pumplocatedinUnit1hasbeenprovidedforthelowdemand,firesystem.Whena,pressuredropnotassociated withthehighdemandlogicoccurs,apressureswitchwillinitiatetheemergency firesystemlogictoenergizethelowdemandfiresystem.The500gpmfirepumpwillimmediately start.Anylowdemandfiresystemactuation willalsoautomatically putthehighdemandfiresystem'selectric-motor-driven anddiesel-engine-driven firepumpsonemergency standby.Eventhoughthe.high.demandfiresystemwouldeventually startthetwodiesel-engine-driven firepumps,thelowdemandsystemmakesdirectprovision forstartingthem.NewSstemDescritionDesignBasisofNewSystemInselecting thecapacityandquantityoffirepumpsrequiredforanadequatefiresuppression watersupply,anumberoffactorsweretaken,intoconsideration.

Someofthesefactorsareasfollows:Therequirements ofthelargestsinglefirehazard.Thenumberofprotected hazardswhichmightbeexpectedtobeinvolvedinagivenfireandthetotalwaterflowrequiredifallareinvolved.

oTheaveragewaterdemandrequiredforhoselinesorsmallsprinkler systems.

t~4ui

,.-.Attachment.l..to,AEP:NRC:,0692CC Page9oThepumpheadnecessary tosupplytheautomatic system(orhoseoutlets)atthehighestandmosthydraulically remotelocations intheplant.oReliability oftheelectrical sourcesupplying theelectric-motor-driven firepumps.oThepotential, althoughunlikely, catastrophic failureofthefirewatertankscreatingthescenarioofnosourceofwaterbeingavailable forfiresuppression.

Thefirewaterstoragetankshavebeenseismically designedtoconformto.UniformBuildingCodeZone1requirements..

Consequently, although-they arenotSeismicClassI,thetankswillwithstand anearthquake ofamagnitude thatmaybeexpectedinthiszone.Thereisnorequirement tobuildthissystemasSeismicClassI.AspartofourAugust19,1977submittal thattransmitted responses toNRCquestions onfireprotection atCookNuclearPlant;weprovidedseveralhanddrawnsketches.

Thesesketchesindicated thattheloadspoweredbythe4Kvsource,including theexistingelectricmotor-driven firepumps,areontheemergency dieselgenerators.

However,wedonotintendfor-thenewelectric-motor-driven pumptobeloadedontotheemergency dieselgenerator.

Thenewdesignhasfourdiesel-engine-driven pumpsthat-.arecapableofsupplying fireprotection waterintheeventofalossofoffsite.power.To.addressthe.scenario ofafireandsimultaneous lossofoffsitepower,theproposedT/Ssrequirethattwooutofthethreepumpsthatmustbeoperableforthesystemtobeoperablebediesel-engine-driven.Sinceonlytwopumpsareneededtoextinguish ourworstcasefirehazard,wewillhaveamplefireextinguishing capability evenintheeventofalossofoffsitepower.FireWaterStorageTanksandWaterSupplyThefunctionofthededicated fireprotection watersystemistoprovidea.reliablesupplyofcleanwatertotheplant'sfiresuppression systems.Thiswillbeaccomplished bydedicated firewaterstoragetanks,firepumps,andapipingnetwork,Thiswatersupplysystemwilltieintotheexistingunderground ringheader.Twofirewaterstoragetankswillbeerected,eachlargeenoughtoextinguish thelargestexpecteddesignbasisfireatCookNuclearPlant.Suctionwillbetakenoffofonlyonetankatatime.Thethreepumpsbeinginstalled totakesuctionfromthesetanksarecommontobothtanks.Motor-operated butterfly valveswillworkincon]unction withwaterlevelgaugestokeepthewaterlevelbetween612,400gallonsand621,000gallons.Thisshouldensurecompliance withtheproposedT/Ssrequirement ofa..minimum.

usablevolumeof565,000gallons,whichisequivalent toalevelindication of34feet.ThisproposedT/Ssrequirement istheamountofwaterneededtoextinguish thelargestsinglefirehazardasdescribed intheFPPM.

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.....,..Attachment l,.toAEP:NRC:0692CC Page10Normally, make-upwatertothetankswillcomefromtheplant'sconnection totheLakeTownship, watersupply.However,BranchTechnical PositionAPSCB9.5-1requiresthatbothtanksbecapableofbeingrefilledinaminimumofeighthours.Ifthetanksarenearlyempty,thenrefilling theminaminimumofeighthoursfromtheLakeTownshipwatersupplywilloverburden theplant'scleanwatersupplysystem.Consequently, inthisevent,thetankswillbefilledwithwaterfromLakeMichigan.

Intheeventthatthetanksarerefilledwithlakewater,thewaterwillbeimmediately treatedtokillzebramussels.Theonlytimethatweenvisionthisoccurring issubsequent toextinguishing amajorfirethatwoulddrainthetanks.Refilling thetanksfollowing routinesurveillances, testingandsmallfireswouldnotdrainthemtoalevelthatwouldnecessitate theuseofLakeMichiganwater.Inaccordance withAppendixAtoBranchTechnical PositionAPSCB9.5-1,eachtankwillhold100%ofthesystemcapacity.

Assuch,onlyonetankisneededtoputouttheworstcasefire.FirePumps"Basedontheabove,three2500gpmfirepumps,twodiesel-driven andoneelectric-motor-driven, willbeinstalled topumpwaterfromthefirewaterstoragetanks.Inaddition, thetwo2000gpmdiesel-engine-driven pumpsthattakesuctionfromLakeMichiganwillbemaintained inordertomaintainthecapability ofobtaining waterfromLakeMichigan.

Asaminimum,threeofthesefivepumpsmustbeoperableatanygiventime.;.Oneofthesethreepumpsmustbea2500gpmdiesel-engine-driven pumpthat.takes.suctionoff.,ofthe.fire,.water.

storagetanks.and onemustbea2000gpmdiesel-engine-driven pumpthattakessuctionoffofLakeMichigan..

Thethirdpumpmaybeanyoftheremaining pumpsinthesystem.Thesystemisdesignedsuchthatoneofthree2500gpmpumpswillstartimmediately uponasignalthatthelinepressureislessthan130psi.Ifthelinepressurecannotbemaintained above130psi,asecondpumpwillstart.Thisisconsistent withNFPA20andisanenhancement overouroldsystemdue'odesignsimplification.

Twoofthe2500gpmfirepumpscansupplyenoughwaterforthelargestsinglefirehazard.Thethirdpumpisaredundant backup,whichallowsustoisolateoneofthepumpsatanygiventimeatitselectrical powersource.Tomaintainthecapability ofobtaining waterfromLakeMichigan, twooftheexisting2000gpmdiesel-engine-driven lakepumpsarebeingmaintained.

Toprecludethesyst:emfrombecominginfestedwithzebramussels,thetwolakepumpswillbeisolatedfromtherestofthefireprotection distribution systembyclosureofthefirstisolation valvedownstream ofthepumps,evenduringsurveillance testing,Thewateractuallypumpedbythelakepumpsduringsurveillance testingwillbereturnedtotheforebayviaareturnline.Inaddition, theautomatic initiating instrumentation onthepumpswillberemovedtoprecludeinadvertent operation ofthepumps.Thesepumpsmustbemanuallystartedlocally.

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,...Attachment 1to,AEP,:NRC:0692CC Page11FirePipingThefirepumpsdischarge intoanunderground ringheaderwhichconnectstotheplant'sexistingfireprotection underground pipingnetwork.DieselFuelOilTanksTheexistingdieselfueloiltanksthatsupplythepumpsthattakesuctionfromLakeMichiganwillbemaintained.

Thesetanksarelocatedinthescreenhouse.

Eachofthenewlyinstalled dieseldrivenpumpswillalsohaveitsown250-gallonfueloiltank.Eachofthesefueloiltankswillbe,located-,in aroominthenewlybuiltfiresuppression watersystempumphousewithitsassociated pump.GeneralDesignCriteria3stipulates thatnonewpotential firehazardwill'elocatedin,thevicinityofanystructures, systems,orcomponents important tosafety.Assuchthepumphouseisremotefromanysafety-relatedequipment, althoughitisintherestricted area.Inaddition, tominimizeanypotential firehazardthatthefueloiltanksmaypose,.>>thewallsofthepumphouseroomwillbemadeofthree-hour fireratedmaterial.

TheexistingT/Ssthataddressdieselfueloiltanksurveillances willbeapplicable to.both,the,newandtheexistingdieselfueloiltanks:.Asstipulated intheT/Ss,only160gallonsoffuelneedtobecontained ineachofthesetanks.Thisistheamountoffuelneededtosupportpumpoperation foreighthours,asstipulated intheNFPAcodes.Asanengineering conservatism thenewtankshavebeensizedtohold90gallonsofadditional fuel,5.0NOSIGNIFICANT HAZARDSDETERMINATION Wehaveevaluated theproposedT/Sschangeandhavedetermined thatitdoesnotrepresent asignificant hazardsconsideration basedonthecriteriaestablished inlOCFR50.92(c).

Operation oftheCookNuclearPlantinaccordance withtheproposedamendment willnot:1Involveasinificantincreaseintherobabilit orconseuencesofanaccidentreviouslevaluated Thenewlyinstalled firewaterstoragetanksandtheirthreeassociated pumpswillsupplyenoughwaterandpumpingcapability tobeabletoputoutthelargestsinglefirehazardevenifoneofthethreepumpsfail,whichisinaccordance withBranchTechnical PositionAPSCB9.5-1.Maintaining twooftheexistingpumpsthattakesuctionoffofLakeMichiganisanaddedconservatism thatresultsinCookNuclearPlanthavingtwocompletely separateandindependent sourcesoffiresuppression water.Consequently, theproposedchangestotheCookNuclearPlantdesignandTechnical 00E~'rakvII~AV>f4'VYlieI~r,6ICEa\JI,lipg440-+,1*~~AeO8kII

,,....Attachment.

1,to.AEP:NRC:0692CC Page12Specifications willnotinvolveasignificant increaseintheprobability or,consequences of,anaccidentpreviously evaluated.

2Createtheossibilit oanewordifferent kindofaccidentfromanreviouslanalzedTheproposedsystemisdesignedinaccordance with10CFR50AppendixAGeneralDesignCriterion 3.Assuch,nonewpotential firehazardswillbelocatedinthevicinityofanystructures, systems,orcomponents important tosafety.Inaddition, theeffectsofthefirewaterstoragetanksrupturing havebeenanalyzedtoensurethatthesafetycapability ofstructures, systems,orcomponents important tosafetyisnotimpaired.

Inaddition, byhavingthetwopumpsthattakesuctionfromLakeMichigan, wewillstillhaveareadilyavailable sourceoffiresuppression waterintheeventthatthetanksfail,Consequently, theproposedchangeswillnotcreatethepossibility ofanewordifferent kindofaccidentfromanypreviously analyzed.

3Involveasinificantreduction inamarinofsafetThemarginof,safetywascarefully considered inthedesignoftheproposedsyst:em.Itwasrealizedearlyinthedesignprocessthatifwedidnotmaintainthecapability toobtainwaterfromtheLakeMichiganthen'heoverallmarginofsafetywouldbereducedfortworeasons.First,LakeMichiganisessentially an.infinitesourceofwaterandthetanksarenot.Second,ifbothtankscatastrophically failed,nofiresuppression waterwouldexistuntilanalternate sourcewasestablished.

Thenumberofpumpsisalsoimportant tothemarginofsafety.Althoughonlythreepumpsareneededtomeettherequirements ofBranchTechnical PositionAPSCB9.5-1,areduction inthenumberofpumpsfromfourintheexisting.

systemtothreeinthenewsystemwouldalsoreducethemarginofsafety.However,zebramusselinfestation oftheexistingsystemalsoposesthepotential toreducethemarginofsafety.Therefore, itwasdecidedtoinstallanewsystemwithcleanwaterstoredintanksandtoalsomaintaintwooftheexistingdi.esel-engine-driven lakepumpsinthenewsystemdesign.,Inthismannerweaddressthezebramusselproblemandmaintainthecapability ofobtaining waterfromLakeMichigan.

Vealsoincreasethenumberofpumpsfromfourintheexistingsystemtofiveinthenewsystem.Bykeepingthelakepumpsisolatedweeliminate anyconcernthatthe,.newportionofthesystemwillbecomeinfestedwithzebramussels.Periodically startingthelakepumpsandflushingtheirdischarge pipingpertheproposedT/Ssrequirements, andchemically treatingthepumpsanddischarge pipingwillhelptoensure,that,they,will,bekeptoperational andfreeofzebramussels.Byincreasing thenumberofpumps,havingdiversity inour,available watersources,andaddressing thezebramusselproblem,wehavenotonlyaddressed thedesignissuesthatmayhavepotentially reducedthemarginofsafety,buthaveactuallyincreased themarginofsafety.

I

..Attachment 1to.AEP:NRC:0692CC Page136.0PENDINGTSsPROPOSALS IMPACTING THISSUBMITTAL NootherrequestsforchangestotheTechnical Specifications forCookNuclearPlantthatarependingNRCrevievimpactthissubmittal.

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