ML17331B068

Application for Amends to Licenses DPR-58 & DPR-74,modifying TS 4.6.5.1.b.1,2 & 3 to Change Ice Condenser Bed SR Interval from 9 Months to 18 Months

ML17331B068
Person / Time
Site:	Cook
Issue date:	11/15/1993
From:	FITZPATRICK E INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17331B069	List: ML17331B068 ML17331B070
References
AEP:NRC:1193, NUDOCS 9311190293
Download: ML17331B068 (20)

Text

ACCEIERAEDDOCUMENTDIST'TION SYSTEMREGULORYINFORMATION DISTRIBUT~

.SYSTEM(RIDS)ACCESSION NBR:9311190293 DOC.DATE:

93/11/15NOTARIZED:

YESDOCKET¹FACIL:50-315 DonaldC.CookNuclearPower-Plant,Unit1,IndianaM0500031550-316DonaldC.CookNuclearPowerPlant,Unit2,IndianaM05000316'UTH.

NAMEAUTHORAFFILIATION FITZPATRICK,R.

IndianaMichiganPowerCo.(formerly Indiana6MichiganEleRECIP.NAME RECIPIENT AFFILIATION MURLEY,T.E.

DocumentControlBranch(Document ControlDesk)I

SUBJECT:

Application foramendstolicensesDPR-586DPR-74,modifying TS4.6.5.l.b.l,2 63tochangeicecondenser bedSRintervalfrom9monthsto18months.DISTRIBUTION CODE:ROOIDCOPIESRECEIVED:LTR gENCLfSIZE:/37STITLE:ORSubmittal:

GeneralDistribution

.NOTES:RECIPIENT IDCODE/NAME PD3-1LAWETZEL,BINTERNAL:

NRR/DE/EELB NRR/DRCH/HICB NRR/DSSA/SRXB OCLEGF~01EXTERNAL:

NRCPDRCOPIESLTTRENCL1122111111101111RECIPIENT IDCODE/NAME PD3-1PDNRR/DORS/OTSB NRR/DSSA/SPLB NUDOCS-ABSTRACT OGC/HDS2NSICCOPIESLTTRENCL111111111011DDDDNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTEICONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)

TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!DTOTALNUMBEROFCOPIESREQUIRED:

LTTR15ENCL13 IndianaMichig~~PowerCompa+P.O.Box1663<Columbus, OH43216gAEP:NRC:1193 DonaldC.CookNuclearPlantUnits1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74UNITS1AND2ICECONDENSER ICEBEDSURVEILLANCE REQUIREMENT TECHNICAL SPECIFICATION AMENDMENT REQUESTU.S.NuclearRegulatory Commission DocumentControlDeskMashington, D.C.20555Attn:T.E.MurleyNovember15,1993

DearDr.Murley:

Thisletteranditsattachments constitute anapplication forTechnical Specifications (T/Ss)changesforDonaldC.CookNuclearPlantUnits1and2.Specifically, weareproposing tomodifyUnit1T/S4.6.5.1.b.l, 2,and3andUnit2T/S4.6.5.1.b.l, 2,and3tochangethesurveillance requirement intervalfrom9monthsto18months.Attachment 1providesa.detailed description oftheproposedchanges,thejustification forthechanges,andourproposeddetermination ofnosignificant hazardsconsideration performed pursuantto10CFR50.92(c).

Attachment 2containstheexistingT/Sspagesmarkedtoreflecttheproposedchanges.Attachment 3containstheproposedT/Sspages.TheproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommittee andbytheNuclearSafetyandDesignReviewCommittee.

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

copiesofthisletteranditsattachments havebeentransmitted toMr.J.R.PadgettoftheMichiganPublicServiceCommission andtotheMichiganDepartment ofPublicHealth.3.80<"'89311190293 931115PDRADOCK05000315PPDRo4.

Dr.T.E.Murley-2-AEP:NRC:1193 Thisletterissubmitted pursuantto10CFR50.54(f)and,assuch,anoathstatement isattached.

Sincerely, VicePresident Attachments cc:A.A.Blind-BridgmanG.CharnoffJ.B.Martin-RegionIIINFEMSectionChiefNRCResidentInspector

-BridgmanJ.R.Padgett

Dr.T.E.MurleyAEP:NRC:1193 bc:S.J.Brewer/J.

B.Kingseed/S.

A.HoverD.H.Malin/K.J.TothM.L.Horvath-BridgmanJ.B.ShinnockW.G.Smith,Jr.B.A.Wetzel,NRC-Washington, D.C.AEP:NRC:1193 DC-N-6015,1 COUNTYOFFRANKLINE.E.Fitzpatrick, beingdulysworn,deposesandsaysthatheistheVicePresident oflicensee, IndianaMichiganPowerCompany,thathehasreadtheforgoingUnits1and2IceCondenser IceBedSurveillance Requirement Technical Specification Amendment Request,andknowsthecontentsthereof;andthatsaidcontentsaretruetothebestofhisknowledge andbelief.Subscribed andsworntobeforemethisdayof19WDNOTARYPUBLICDlANAL.EADSNotaryPublic,StateofOhioJ)ycommission expires22495 Attachment 1toAEP:NRC:1193 lOCFR50.92 Determination forProposedChangestotheDonaldC.CookNuclearPlantUnits1and2Technical Specifications Attachment 1toAEP:NRC:1193 Page11.0SECTIONSTOBECHANGEDUnit1:Technical Specification (T/S)4.6.5.l.b.l, 2,and3.Unit2:Technical Specification (T/S)4.6.5.1.b.l, 2,and3.2.0EXTENTOFCHANGESWeareproposing tochangethesurveillance requirement intervalfrom9monthsto18monthsonthereferenced Technical Specifications forchemicalanalysis,

weighing, andflowpassageinspection oftheicecondenser.

3.0 CHANGESREUESTEDIdentical

changesarebeingsoughtforboththeUnit1andUnit2Technical Specifications.

3.1UNIT1Weareproposing tomakethefollowing changestotheUnit1Technical Specifications.

ReviseTS4651bSurveillance IntervalReuirements Currently, thereisaninemonthsurveillance requirement toperformchemicalanalysesoftheicebedtoensureaboronconcentration of1800ppmandapHof.9.0to9.5at'5'C,verifyata95Xconfidence levelthatadequateiceinventory isavailable anddistributed evenly,andensurethatadequateflowareaisavailable.

Weareproposing tochangethisintervalto18months.3.2UNIT2Weareproposing tomakethefollowing changestotheUnit2Technical Specifications.

ReviseTS465.1bSurveillance IntervalReuirements Currently, thereisaninemonthsurveillance requirement toperformchemicalanalysesoftheicebedtoensureaboronconcentration of1800ppmandapHof9.0to9.5at25'C,verifyata95Xconfidence levelthatadequateiceinventory isavailable anddistributed evenly,andensurethatadequateflowareaisavailable.

Weareproposing tochangethisintervalto18months.

'II Attachment 1toAEP:NRC:1193 Page2ItshouldbenotedthatthebasesforT/S3/4.6.5.1 willneedtobeupdatedtoreflecttheincreased timeintervaliftheproposedamendment isapproved.

4,0DISCUSSION SstemDescritionTheicecondenser isdesignedtoensurethattheoverallsystemwillbeavailable toprovidesufficient pressuresuppression capability tolimitthecontainment peakpressuretolessthan12psigduringLOCAconditions assumedintheaccidentanalysis.

Inparticular, therequirements fortheicebedensurethattherequirediceinventory will1)bedistributed evenlythroughthecontainment.

bays,2)containsufficient borontoprecludedilutionofthecontainment sumpfollowing aLOCA,and3)containsufficient heatremovalcapability tocondensethereactorcoolantsystemvolumeduringaLOCA.Currently, theicebedisdetermined operablebymeetingvarioussurveillance requirements whichinclude1)verifying icebedtemperature islessthanorequalto27'Fatleastoncepertwelvehours,2)performing chemicalanalysesoftheicebedtoensureaboronconcentration of1800ppmandapHof9.0to9.5at25'Catleasteveryninemonths,3)verifying ata95Xconfidence levelthateachbasketcontainsatleast1220lbsoficeeveryninemonths,4)ensuringadequateflowareaisavailable atleastonceeveryninemonths,5)performing avisualinspection atleastonceper18monthsoftheinletplenumsupportstructures andturningvanestoensureicebuildupisnottothepointofindicating abnormaldegradation oftheicecondenser, and6)verifying thestructural integrity oftheicebasketsbyinspecting arepresentative sampleatleastonceevery40months.Allofthesesurveillance requirements aremetbyperformance ofapprovedplantprocedures.

Thefirstlineofdefensetodetermine theoperability oftheicecondenser lieswiththeoperator.

Asmentioned above,theicebedtemperature ismonitored atleastonceeverytwelvehourstoensuretemperatures arelessthanorequal-to27'F.Thisisaccomplished inaconservative mannerbyreviewing atleast18different pointsthroughout theicecondenser andensuringtheyarealllessthanorequalto27'F.Throughout theyeartheaverageicebedtemperature generally rangesbetween16'Fand21'F,wellbelowthe27'Fsetpoint.

Inadditiontothesurveillance requirements, therearealarmsinthecontrolroomwhichwillindicatetotheoperatorifanyofthepointsbeingrecordedreach27'F.Also,weeklyoperatortoursrequiretheoperators towalkdowntherefrigeration systemtoevaluateitsabilitytofunction.

Thisincludeswalkingdownthe

~g'Il'~off Attachment 1toAEP:NRC:1193 Page3chillers, airhandlingunits,andglycolpumpstoensurethattheyareinproperworkingorder.Thetoursalsorequiretheoperators toopenasampleoftheintermediate deckdoorstoensuretheyarenotfrozenshut.Thishelpstoensurethatnoabnormaldegradation oftheicecondenser isoccurring duetocondensation orfrozendrainlinesinlocalized areas.Thenextlineofdefenseistheperformance ofvariousprocedures toensuretheicebedisingoodphysicalcondition, consistent withtheassumptions usedintheaccidentanalysis.

Duetotheninemonthsurveillance requirement, thesesurveillances arecurrently completed atleastonceduringafuelcyclewhilethereactorisonlineandonceduringtherefueling outage.Thesesurveillances arereferenced aboveandincludechemicalsampling, icebasketweighing, andflowpassageinspection.

Thereasonforthechemicalsamplingistoensuretheboronconcentration andpHrequirements aremettoprecludedilutionofthecontainment sumpfollowing aLOCA.Theminimumweightfigureof1220poundsoficeperbasketcontainsa10Xconservative allowance foricelossthroughsublimation.

Flowpassageinspection isperformed toensuretheabsenceofabnormalicebeddegradation aswouldbeindicated ifaccumulations exceedthe3/8"specified inthetechnical specifications.

Whenthesesurveillances areperformed whileinarefueling outage,as-founddataiscollected priortoperforming thelaborintensive maintenance routine.Themaintenance routinetypically includesweighingasmanybasketsaspossiblewithinanallottedtimeframeandemptyingthebasketsthatwouldnot,basedonoperating experience, weighgreaterthan1220poundsat'hestartofthenextrefueling outage.Thesubsequent maintenance includesrefilling theicebasketswithiceandperforming defrostsoftheicecondenser asnecessary toensuremaximumheattransfercapability duringtheupcomingfuelcycle.Also,significant effortisdedicated tocleaningupicethataccumulates duringtheemptying/refilling processoftheicebasketstoensurenoflowblockageoccursduringthesubsequent fuelcycle.Tworemaining surveillances areperformed toensurethatnoabnormaldegradation oftheicecondenser istakingplace.Thefirst,performed onan18monthfrequency;.

is-aninspection oftheinletplenumandturningvanesforfrostoriceaccumulation.

Thesecond,performed ona40monthfrequency isavisualstructural inspection oftheicebasketstoensurethattheyarefreeofdetrimental structural wear,cracks,corrosion orotherdamage.

~y1L.a Attachment 1toAEP:NRC:1193 Page4ReasonforProosedTechnical Secification ChaneReuestTherequesttoincreasethesurveillance intervalfromninemonthsto18monthswoulddecreasethenumberofevolutions necessary toentercontainment duringoperation oftheunittoverifyicebasketboronconcentrations, weights,andflowareablockage.

Therevisedsurveillance intervalwouldrequiretheperformance ofsuchicebedmonitoring duringrefueling outages.Webelievethatimprovements inicebedinspection resultsduetomodifiedmaintenance techniques anddesignchangesthathavebeenimplemented since1984provideadequateassurance thattheicecondenser canmeetandevenexceeditsdesignfunctionwithoutperforming thesurveillances onaninemonthfrequency.

Also,increasing thesurveillance intervalwouldreducethestressesputonthebasketsandtheirsupportsduetorepeatedweighingevolutions'ustification forProosedTechnical Secification ChanesAnincreased surveillance intervalforthechemicalanalysisrequiredbyT/S4.6.5.1.b.l isjustified forthefollowing reasons,First,priortorefilling basketsduringrefueling outagemaintenance activities, theboratedwatersourceusedtomakeiceissampledtoverifythattheboronconcentration andpHlevelsaremet.Areviewoflicenseeeventreportsdatingbackthrough1978revealednooccurrences offailingtomeetthesurveillance requirements ofthisspecification.

Also,areviewoficecondenser basketboronconcentration andpHsampledatabetweenAugust,1986andSeptember, 1992forUnit1andbetweenAugust,1986andJanuary,1993forUnit2wasreviewed, andotherthanafewproblemsduetothesamplingtechniques, noproblemswereapparentinmeetingthesurveillance requirements ofthisspecification.

Also,itshouldbenotedthatanincreasetothe18monthfrequency hasalreadybeenapprovedinthenewstandardtechnical specifications forWestinghouse plantsissuedinSeptember 1992bytheNRC.Thefrequency of18monthswasdeveloped considering thesefacts:-1)Longtermicestoragetestshavedetermined thatthechemicalcomposition ofthestorediceisextremely stable,2)Operating experience hasdemonstrated thatmeetingtheboronconcentration andpHrequirements hasneverbeenaproblem,and3)Someonewouldhavetoenterthecontainment totakethesample,and,iftheunitisatpower,thatpersonwouldreceivearadiation dose.

Attachment 1toAEP:NRC:1193 Page5TS4.6.51b2Areviewoflicenseeeventreportsregarding icebasketweighingdatingbackthrough1978forT/S4.6.5.1.b.2 wasperformed.

Duringthistimeframe,therewerethreeoccurrences inUnit1andfiveoccurrences inUnit2whensomeofthesurveillance requirements werenotmet.T/S4.6.5.l.b.2 requiresthefollowing threecriteriabemettomeeticeinventory requirements.

1)Arepresentative sampleofatleast144icebasketsmustbeweighedanddetermined tocontainatleast1220poundsoficeata95percentlevelofconfidence, 2)Theminimumaverageiceweightsofthesamplebasketsfromradialrows1,2,4,6,8and9ineachofthreegroupsshallnotbelessthan1220poundsoficeata95percentlevelofconfidence, and3)Minimumtotalicecondenser weightata95percentlevelofconfidence shallnotbelessthan2,371,450 pounds.Theoccurrences occurredin1982,1983,and1985inUnit1andin1982,1983,1984,and1986inUnit2.Asaresultoftheproblemsencountered, anicecondenser taskforcewasformedcomposedofplantengineers, AEPSCengineers, andconsulting specialists inrefrigeration.

Thistaskforceprovidednumerousrecommendations toimprovethecoolingcapability oftheicecondenser refrigeration systemanddeveloped bettermaintenance techniques toimproveiceweights.Someoftherecommendations whichhavebeenincorporated asdesignchangesincludeinstalling aprogrammable defrostcontroller forairhandlingunitstoensurethatheatloadsaredistributed evenlythroughout theicecondenser toreduceexcessive sublimation inlocalized areas.Duringrefueling outageicereplenishment activities, toolsandvariousothermaterials hadaccumulated intheductwork,whichcreatedhotspotsintheicebedandincreased sublimation rateswheretheductworkwasblocked.Debrisscreenswereinstalled overwallpanelopeningstoprecludecloggingofductworkusedtocooltheicebed.Also,aflowbalanceoftheductworkwasperformed inbothunitstodistribute coolingmoreevenlytothecranewallinordertoreducesublimation ratesthatwereoccurring inrows8and9.Manyotherdesignchangeshavebeeninstalled toimprovethereliability andperformance oftheicecondenser refrigeration.

system.Maintenance techniques developed includedusingvibrators toemptybasketsanddeveloping toolstoreplacecruciforms inthebaskets.Thistaskforceisstillintactandconvenesperiodically toreviewthestatusoficecondenser issues.Asrecommended bythetaskforce,maintenance techniques werealsoenhancedtoincreasetheiceweightsinbasketstoensureminimumtechnical specification requirements wouldbemetwithouthavingtoshutdownthereactormid-cycle toreplenish iceinventory.

Thiswas

,)

Attachment 1toAEP:NRC:1193 Page6accomplished bydeveloping techniques toemptythebasketcompletely andthenrefilling itwithnewiceinsteadofaddingwatertoexistingiceorpackingicebyhandtoincreaseiceweight.Thesetechniques, aswellastheabovedesignchangeimplementations, haveledtoanincreaseintheaverageas-foundicebasketweightsofatleast90poundsinUnit1sinceSeptember of1985andinUnit2sinceDecemberof1984.Itshouldbenotedthatthethirdrequirement fortotalminimumicecondenser weighthasalwaysbeensatisfied andhasneverbeenanissueofconcern.Thedeficiencies haveoccurredwhencalculating averageindividual andgroupbasketweights.Recommendations alsoresultedinaheightened awareness oftheimportance oftherefrigeration systemanditsassociated maintenance practices whichhavebeenimprovedtoensurethatairhandlingunitsarerepairedinatimelymanner.Weeklytoursbyoperations personnel havealsobeenincorporated toidentifyrefrigeration systemdeficiencies beforetheyhaveanadverseeffectonthecondition oftheicecondenser.

TheactionsrequiredbyT/S4.6.5.l.a, whichisperformed ona12hourinterval, aswellasassociated alarmsofferadequateindication foricebedandrefrigeration systemstatuspriortoanyabnormaldegradation oftheicecondenser.

Basedonthepreviousdiscussion, weproposethatthesurveillance intervalofninemonthsforT/S4.6.5.1.b.2 beincreased to18months.Asimilarrequest,published intheFederalRegisteronFebruary20,1991wasmadebyDukePowerCompanyfortheirCatawbaNuclearStation,Units1and2,andwassubsequently approvedbytheNRC.DukePowerCompanyincreased theirminimumrequirediceweightsapproximately fivepercenttoaccountforexpectedsublimation.

Webelievethisisnotnecessary fortheCookNuclearPlantrequestbecausethepreviousweighings duringtheUnit1andUnit2refueling outagesdatingbackthrough1986havemetallsurveillance requirements withoutanyiceadditions beingmademid-cycle.

TS4.6.5.1.b.3 Withrespecttotheflowpassageinspections requiredbyTechnical Specification 4.6.5.1.b.3, licenseeeventreporthistories werereviewedbackthrough1978.Inthattimeframe,thereweresevenoccurrences between1983and1988whichindicated thattherequirements ofthespecification hadnotbeenmet.Ineachofthecases,however,itwasconcluded thattheflowpassageswerenotdegradedtosuchadegreethatwouldhaveprohibited theice

'

Attachment 1toAEP:NRC:1193 Page7condenser fromperforming itsdesignfunctionasassumedintheshort-term containment integrity analysis.

Since1988therehasbeennoindication ofabnormalicebeddegradation withrespecttomeetingtherecpxirements ofT/S4.6.5.1.b.3.

Webelievethatthesurveillances performed perT/S4.6.5.1.a ona,twelvehourintervalandtheaddedtoursperformed ontheicecondenser refrigeration systembyoperations personnel providesufficient indication ofabnormaldegradation oftheicecondenser priortoitbecomingaconcern.ItshouldbenotedthatthefailuresthatoccurredperT/S4.6.5.1.b.2 alsooccurredduringasimilartimeframe(1982through1986),andwebelievethedesignchangesimplemented andtheenhancedmaintenance techniques discussed abovehavecontributed toreducingtheamountoficebuild-upintheflowpassages.

Alsotobeconsidered aretheextensive effortsthatareputforthtoensureflowpassagesarecleanedoutfollowing maintenance activities duringarefueling outage.New,methodsweredeveloped in1992toperformlocalized defrosting oftheicecondenser bayswhichhavereducedfrostbuildupontheicecondenser latticeframework alongthecraneandcontainment walls.Basedonthefactthatthesurveillance requirements fortheprocedures havebeenmetsince1988,throughthreemid-cycle inspections, inbothUnit1andUnit2,werequestthattheintervalforinspection beincreased to18months.5'NOSIGNIFICANT HAZARDSDETERMINATION Wehaveevaluated theproposedT/Ssexemption andhavedetermined thatitshouldnotrecpxireasignificant hazardsconsideration basedonthecriteriaestablished in10CFR50.92(c).

Operation oftheCookNuclearPlantinaccordance withtheproposedamendment willnot:(1)Involveasinificantincreaseintherobabilit orconseencesofanaccidentreviouslevaluated.

Theincreaseinthesurveillance intervaldoesnotcreateasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated.

Recentoperating experience withtheicecondenser indicates thatallrequiredboronconcentrations, pHlevels,iceweights,andfrostoriceaccumulation criteriaestablished intheT/Sshavebeenmetwithoutanycorrective orpreventive actionbeingtakenduringthemid-cycle inspections.

Thisprovidesconfidence thattheicecondenser willcontinuetobeabletoperformasassumedinthesafetyanalysis.

Therefore, weconcludethattheproposedT/Sschangesdonotinvolveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated.

Attachment 1toAEP:NRC:1193 Page8(2)Createtheossibilit ofanewordifferent kindofaccidentfromanreviouslanalzedTheincreaseinthesurveillance intervalfortheicecondenser from9to18monthswillnotaffectthefunctionality orrequiredperformance capability oftheicecondenser.

Theabovereviewfoundnopossibility ofanewordifferent kindofaccidentfromanypreviously analyzed.

(3)Involveasinificantreduction inamarinofsafetTheproposedT/Sschangesonlychangethesurveillance frequency requirements whichwebelievewillnotchallenge theabilityoftheicecondenser toperformitsfunctionasdefinedinthesafetyanalysis.

OtherT/Ssandplantindications areinplacetowarntheoperatorofrefrigeration systemproblemspriortopossibleicebeddegradation.

Therefore, weconcludethattheT/Schangedoesnotinvolveasignificant reduction inamarginofsafety.6.0PENDINGTSsPROPOSALS IMPACTING THISSUBMITTAL Therearecurrently nootherT/Ssproposals underreviewthatwouldimpactthissubmittal,