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{{#Wiki_filter:ACCEIERAEDDOCUMENTDIST' | {{#Wiki_filter: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:== | ==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:== | ==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). | |||
Dr.T.E.Murley-2-AEP:NRC: | 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: | Dr.T.E.MurleyAEP:NRC:1193 bc:S.J.Brewer/J. | ||
'II | B.Kingseed/S. | ||
~g'Il'~off | 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, | ||
~y1L.a | : 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,}} |
Revision as of 08:16, 29 June 2018
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: |
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
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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
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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,