ML17326A193
| ML17326A193 | |
| Person / Time | |
|---|---|
| Issue date: | 06/23/1999 |
| From: | DAVIS J W NUCLEAR ENERGY INSTITUTE (FORMERLY NUCLEAR MGMT & |
| To: | BECKNER W D NRC (Affiliation Not Assigned) |
| References | |
| PROJECT-689, RTR-NUREG-1430, RTR-NUREG-1431, RTR-NUREG-1432, RTR-NUREG-1433, RTR-NUREG-1434 NUDOCS 9907120272 | |
| Download: ML17326A193 (65) | |
Text
NUCLEARENERGYINSTITUTE JamesW.DavisDIRECTOROPERATIONS DEPARTMENT, NUCLEARGENERATION June23,1999Dr.WilliamD.Beckner,BranchChiefTechnical Specifications BranchOfficeofNuclearReactorRegulation U.S.NuclearRegulatory Commission Washington, DC20555-0001
SUBJECT:
Forwarding ofRevisedTSTFsandNewTSTFsPROJECTNUMBER:689
DearDr.Beckner:
Enclosedare20revisedandeightnewTechnical Specification NUREGsNEITechnical Specification TaskForce(TSTF)Travelers.
Thisletteralsotransmits nineeditorial changesandthestatusofallcurrently pendingTechnical Specification Bulletins (TSBs).Revisedtravelers areTSTF-17,Rev.2,TSTF-37,Rev.2,TSTF-58,Rev.1,TSTF-59,Rev1,TSTF-107, Rev.4,TSTF-169, Rev.1,TSTF-197, Rev.2,TSTF-204, Rev.1,TSTF-207, Rev.3,TSTF-230, Rev.1,TSTF-262, Rev.1,TSTF-263,Rev.2,TSTF-265, Rev.1,TSTF-266, Rev.1,TSTF-273, Rev.1,TSTF-280, Rev.1,TSTF-283, Rev.1,TSTF-284, Rev.2,TSTF-309,Rev.2andTSTF-316, Rev.1.Thesetravelers weremodifiedasaresultoffeedbackanddiscussions withNRCstaff.Thenewtravelers areTSTF-333, Rev.0,TSTF-334,,Rev.
0,TSTF-335, Rev.0,TSTF-336, Rev.0,TSTF-337, Rev.0,TSTF-338, Rev.0,TSTF-339, Rev.0andTSTF-340, Rev.0.Alsoincludedinthistransmittal areeditsBWROG-ED-4, GEOG-ED-48, GEOG-ED-49, GEOG-ED-50, GEOG-ED-51, NRC-ED-13, NRC-ED-14, WOG-ED-18 andWOG-ED-19.
17761STREET,NWSUITE400WASHINGTON.
OC20006.3708 PHONE202.739.8105 FAX202.785.1898 jwdnei.or9 Hnc1osure 3
r Mr.WilliamD.Beckner,BranchChiefJune23,1999Page2TSBstatusisasfollows:oTSB-2,Rev.0hasbeenincludedinTSTF-310.
TSB-3,Rev.0hasbeenprocessed asNRC-ED-4.
TSB-7,Rev.0hasbeenincorporated withrelatedmaterialinTSTF-338.
TSB-12,Rev.0isincorporated byTSTF-263.
TSB-15,Rev0hasbeenincorporated inTSTF-340.
TSB-16,Rev.0hasbeenrejectedbyWOG.Duetomultipledesigns,thisisnotagenericchange.Thisissueshouldbeaddressed asnecessary onaplantspecificbasis.TSB-17,Rev.0isstillunderevaluation.
WOGisproviding adraftresolution ofthepressurizer levelpositionforreviewbyBWOGandGEOG.Thesteamgenerator levelportionrequiresevaluation whichwilllikelyextendbeyondthedeadlineforinclusion intoRevision2oftheITSNUREGs.TSB-18,Rev.0isunderevaluation whichwilllikelyextendbeyondthedeadlineforinclusion intoRevision2oftheITSNUREGs.TSB-19,Rev.0issimilartoTSTF-164.
TheTSTFrecommends approvalofTSTF-164ratherthanprocessing TSB-19.oTSB-20,Rev.0isunderevaluation byWOG.TSB-21,Rev0concerning ReactorCoolantSystemSpecificActivi:yLCO3.4.16isstillunderevaluation bytheTSTF.Additional dialogueisrequiredbetweentheTSTFandNRC.TheTSTFalsowithdraws TSTFs-270 and288andtheyhavebeenaddressed inTSTF-284, Rev.2.Also,asexplained inourmeetingJune16,1999,theTSTFrequestsyoureconsider yourrejection ofTSTF-41.Anupdatedprioritylistisalsoenclosed.
Pleasecontactmeat(202)739-8105orVinceGilbertat(202)739-8138ifyouhaveanyquestions orneedtomeetwithindustryexpertsontheserecommended changes.Sincerely, hv'P~~JamesW.DavisEnclosures c:DeborahL.JohnsonStewartL.MagruderNRR-DRPMTechnical Specification TaskForce e
(WOG-139, Rev.0)Indust.y/TSTF StandardTechnical Specification ChangeTravelerClarifytheIceBasket20BasketWeightCriteriaClassification:
1)CorrectSpecifications NUREGsAffected:
[1430~14311432it1433Q1434TSTF-335Description:
Theproposedchangewillmovethecriteriaforselecting anadditional 20icebasketsforweighingifoneofthcrandomlyselectedbasketsweightfallsbelowtheTechnical Specification (TS)requiredminimum&omthebasestotheTS.Surveillance Requirement (SR).Thiscriterion wasincludedintheTSSRinPhaseIIoftheWOGMeritTS'sandwasmovedtothebasesinPhaseIILAdditionally, thewordingoftheSRwillberevisedtoeliminate anyconfusion overtheTSSRstatement that"each"icebasketcontainsgreaterthanorequalto[1400]lboficesinceitwillprovide,asapartoftheTSSR,thestepstotakeifoneormorebasketsareidentified weighinglessthantherequiredminimumandthattheweightrequirements areforthebeginning oftheoperating cycle.Finally,thesurveillance
&equencywillberevised&om9monthsto18monthswhichwillthenbeinaccordance withthemajorityofthcicecondenser plantssurveillance frequencies.
Justification:
Thebasicrequirement fortheiceweightintheicecondenser istoensureasufficient massoficeisavailable tocondensethesteamproducedbyaLOCAthusensuringthepeakcontainment pressureismaintained belowdesignlimitsfollowing adesignbasisaccident(DBA).Aspecified valueoficeforeachicebasketisrequiredtoprovideanevendistribution oficeintheicecondenser.
Thcrequirement toweighadditional baskets&omthesamebayinwhichoneormoreicebasketswereidentified asbeingbelowtheminimumspecified weightensuresthatnolocalzoneexiststhatisgrosslydeficient inice.Suchazonecouldexperience earlymeltoutduringaDBAtransient, creatingapathforsteamtopassthroughtheicecondenser withoutbeingcondensed.
Placingthestatement requiring thesamplingof20additional basketsinabayintheTSSRdoesnotresultinareduction intherequirements associated withtheice,condenser.
Instead,thiswillensureacommonunderstanding andimplementation ofthe'requirements whenar.icebasketisidentified asbeingunderweight.
Atpresent,theTSSRonlystatesthat"eachbasketcontain>[1400]lbofice."NoguidanceisprovidedintheTSastowhatactiontotakeforanunderweight basket.Thepresentwordingcouldallowtheincorrect interpretation thattheicccondenser isinoperable whenasingleunderweight basketisidentified.
Placingthcpreviously described statement backintotheTSandrevisingtheremainder oftheSRtoclarifythewordingwouldensureaclearunderstanding oftheactionsnecessary foridentified underweight baskets.Theclarification thattheweightrequirement isapplicable tothebeginning ofthecycledoesnotchangethepresentintentoftheTSbutensuresthereisnoconfusion thattheweightdocumented intheSRistheweightrequiredatthebeginning ofthecyclesincetheweightattheendoftheoperating cyclemaybelessthanthisduetosublimation.
Thisdoesnotresultinachangetotheintentorimplementation oftheTSsinceasublimation allowance wasprovidedintheSRweightrequirement.
Theincreasetoan18month&cquencydoesnotresultinanoverallreduction intheend-of-cycle iccweightaslongaseitheraplantspecificanalysisshowsasufficient marginoficeintheicccondenser toaccountforsublimation ortherequiredminimumiceweightasspecified intheSRisadjustedupwardtoaccountfortheincreased sublimation time.Eitherofthesemethodswillallowforsublimation overthclongerSurveillance intervalwithoutadecrcascbelowtheminimumrequirediceweightattheendoftheoperating cycle.IndustryContact:Buschbaum, DennyNRCContact:Giardina, BobRevisionHistory(254)897-5851301-314-3152 dbuschbltuelectric.corn Ibb1nrc.govOGRevision0RevisionStatus:ActiveNextAction:NRCRevisionProposedby:SequoyahTravelerRev.2.Copyright (C)1998,ExcelServicesCorporation.
UsebyExcelServicesassociates, utilityclients,andtheU.S.NuclearRegulatory Commission isgranted.Allotheruscwithoutwrittenpermission isprohibited.
etl5199 (WOO-139, Rev.0)TSTF-33'G Revision0RevisionStatus:ActiveNextAction:NRCRevisionDescription:
OriginalIssueOwnersGroupReviewInformation DateOriginated byOG:1I-Jun-99OwnersGroupComments(NoComments)
OwnersGroupResolution:
ApprovedDate:11-Jun-99 TSTFReviewInformation TSTFReceivedDate:11-Jun-99 DateDistributed forReview11-Jun-99 OGReviewCornpleted:
~BWOG~WOG~CEOGatr,BWROGTSTFComments:
(NoComments)
TSTFResolution:
ApprovedDate:15-Jun-99 NRCReviewInformation NRCReceivedDate:16-Jun-99 NRCComments:
(NoComments)
FinalResolution:
NRCActionpendingFinalResolution Date:Incorporation IntotheNUREGsFiletoBBS/LANDate:NUREGRevincorporated:
AffectedTechnical Specifications TSTFinformedDate:SR3.6.15.2IceBed(IceCondenser)
TSTFApprovedDate:SR3.6.15.2BasusIceBed(iceCondenser)
SR3.6.15.3IceBed(IceCondenser)
SR3.6.15.3BasesIceBed(Ice,Condenser)
TravelerRcv.2.Copyright (C)l998,ExcelServicesCorporation.
UscbyExce!Services associates, utilitydients,andtheU.S.hluclearRegulatory Commission isgranted.Allotherusewithoutwrittenpermission isprohibited.
6/IS/99 0
73!r-33<Attachment 1Technical Specification 3.6.15NoSignificant HazardsConsideration NOSIGNIFICANT HAZARDSCONSIDERATION DETERMINATION
[Utili,ty Name]hasconcluded thatoperation of[PlantName]Unit[I],inaccordance withtheproposedchangetothetechnical specifications foroperating license(s)],
doesnotinvolveasignificant hazardsconsideration.
[UtilityName]'sconclusion isbasedonitsevaluation, inaccordance with10CFR50.91(a)(1),
ofthethreestandards setforthin10CFR50.92(c).
A.Theroosedamendment doesnotinvolveasiificantincreaseintherobabilit orconseencesofanaccidentreviouslevaluated.
TheproposedTSamendments discussed belowcannotincreasetheprobability ofoccurrence ofanyanalyzedaccidentbecausetheyarenottheresultorcauseofanyphysicalmodification totheicecondenser structures, andforthecurrentdesignoftheicecondenser, thereisnocorrelation betweenanycrediblefailureandtheinitiation ofanypreviously analyzedaccident.
Regarding theconsequences ofanalyzedaccidents, theproposedamendment providesfortheactionsrequiredifoneozmoreicecondenser icebasketsaredetermined toweighbelowtheminimumspecified valuetobemadeapartoftheTSsurveillance requirement (SR)insteadofbeinglocatedinthebases.Thisensuresconsistent interpretation oftherequirements oftheTS.Theclarification oftheresponserequiredifoneormoreicebasketsinagivenbayisdetermined tobeunderweight ensuressufficient iceismaintained ineachbaytopreventearlymeltoutinalocalzonefollowing aDBAandthattherequiredoveralliceweightismaintained intheicecondenser.
Additionally, theclarification thattheweighi.requirement isapplicable tothebeginning ofthecycledoesnotchangethepresentintentoztheTSbutensuresthereisnoconfusion, sincetheweightattheendoftheoperating cyclemaybelessthanthatspecified intheSRduetosublimation.
Thisdoesnotresu'tinachange"otheintentorimplementation oftheTSsinceasublimation allowance wasprovidedintheoriginalSRweightrequirement.
Theseclarifications donotresultinanyaffectonplantequipment,'r operation andtheactionstakenauringtheimplementation oftherevisedTSwillbethesameaspriortotherevision.
Therefore, theclarification oftheserequirements willnotincreasetheconsequences ofanyaccidentpreviously evaluated.
Theproposedamendment alsorevisestheSurveillance frequency fromevery9monthstoevery18monthssuchthatitwillcoincidewithrefueling outages.Theoriginaliceweightrequirements fortheicecondenser surveillance includedaconservative allowance foricelossthroughsublimation toensurethedesignweightlowerlimitwasnotexceededduringtheSurveillance interval.
Verification thatsufficient iceismaintained intheicecondenser isperformed atthebeginning ofeachoperating cycletoensurethedesignminimumweightlimitisnotexceededattheendoftheinterval.
Therefore, increasing theSurveillance frequency doesnotaffecttheicecondenser operation oraccidentresponsesincesufficient iceismaintained toaddressthelimitingdesignbasisaccident(s)
(DBAs)andtheproposedamendment willnotincreasetheconsequences ofanyaccidentpreviously evaluated.
Theroosedamendment doesnotcreatetheossibilit ofanewordifferent kindofaccidentfromanaccidentreviouslevaluated.
Theinclusion oftheactionrequiredforanunderweight icebasketintheTSSR,insteadofinthebasesoftheTS,providesfortheconsistent interpretation oftherequirement.
Theclarification oftheresponserequiredifoneormoreicebasketsinagivenbayisdetermined tobeunderweight ensuressufficient iceismaintained ineachbaytopreventearlymeltoutinalocalzonefollowing,a DBAandthattherequiredoveralliceweightismaintained intheicecondenser.
Additionally, theclarification thattheweightrequirement isapplicable tothebeginning ofthecycledoesnotchangethepresentintentoftheTSbutensuresthereisnoconfusion, sincetheweightattheendoftheoperating cyclemaybelessthanthatspecified intheSRduetosublimation.
Thisdoesnotresultinachangetotheintentorimplementation oftheTSsinceasublimation allowance wasprovidedintheoriginalSRweightrequirement.
Theoperation andmaintenance oftheicecondenser anditsassociated equipment willnotchangeasaresultoftheseclarifications.
Therefore, theimplementation oftheseclarifications willnotcreate,thepossibility ofaccidents orequipment malfunctions ofanewordifferent kindfromanypreviously evaluated.
Theproposedamendment alsorevisestheSurveillance 75+F-3)xfrequency fromevery9monthstoevery18monthssuchthatitwillcoincidewithrefueling outages.Theoriginaliceweightrequirements fortheicecondenser Surveillance includedaconservative allowance foricelossthroughsublimation toensurethedesignminimumweightlimitwasnotexceededduring'theSurveillance interval.
Theproposedamendment ensuresanadequateamountoficeismaintained intheicecondenser byeitheranincreaseintherequirediceweighttoaddresstheincreased sublimation timeorbyaplantspecificanalysisjustifying theallowedweight,thusensuringthedesignweightlowerlimitisnotexceededattheendoftheinterval.
Theicecondenser servestolimitthepeakpressureinsidecontainment following aLossofCoolingAccident(LOCA)andsufficient icewouldbeavailable atalltimestokeepthepeakcontainment pressurebelowthedesignlimit.Therefore, increasing theSurveillance frequency willnotaffecttheicecondenser operation oraccidentresponsesincesufficient iceismaintained toaddressthelimitingDBAsandtheproposedamendment willnotcreatethepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated.
Theroosedamendment doesnotinvolveasiificant.reduction inamarinofsafetTheproposedamendment allowsfortheconsistent interpretation oftherequitedactionsifanicebasketisdetermined toweighlessthantherequiredminimum.Theinclusion oftheseactj.onsintheTSSRinsteadofintheTSbasesassuresthecorrectactionswillbetakenasintendedbytheTSs.Theclarification ofthe.responserequiredifoneormoreicebasketsinagivenbayisdetermined tobeunderweight ensuressufficient iceismaintained ineachbaytopreventearlymeltoutinalocalzonefollowing aDBAandthattherequiredoveralliceweightismaintained intheicecondenser.
Additionally, theclarification thattheweightrequirement isapplicable tothebeginning ofthecycledoesnotchangethepresentintentoftheTSbutensuresthereisnoconfusion, sincetheweightattheendoftheoperat'ing cyclemaybelessthanthatspecified intheSRduetosublimation.
Thisdoesnotresultinachangetotheintentorimplementation oftheTSsinceasublimation allowance wasprovidedintheoriginalSRweightrequirement.
Theproposedclarifications donotresultinorhaveanyaffectontheoperation ormaintenance ofanyplantequipments Y
/Thusthedesignlimitsforthecontinued safe'function ofthecontainment structure following aDBAarenotexceededduetothischangeandtherefore theproposedamendment doesnotinvolveareduction inamarginofsafety.Theicecondenser systemisprovidedtoabsorbthermalenergyreleasesfollowingaLOCAandtolimitthepeakpressureinsidecontainment.
Thecontainment analysisshowsthattheproposedamendment torevisetheSurveillance frequency fromevery9monthstoevery18monthswillnotresultinanincreasetothepeakcontainment pressurefollowing aLOCAsincetheminimumiceweightlimithasalsobeenadequately addressed ensuringthatsufficient iceisavailable attheendoftheSurveillance interval.
Therefore, increasing theSurveillance frequency willnotaffecttheicecondenser operation oraccidentresponsesincesufficient iceismaintained toaddressthelimitingDBAsandthedesignlimitsforthecontinued safefunctionofthecontainment structure following aDBAarenotaffected.
Forthesereasons,theproposedamendment doesnotinvolveareduction inamarginofsafety.V.ENVIRONMENTAL IMPACTCONSIDERATION Theproposedchangedoesnotinvolveasignificant hazardsconsideration, asignificant changeinthetypesoforsignificant increaseintheamountsofanyeffluents thatmaybereleasedoffsite,orasignificant increaseinindividual orcumulative occupational radiation exposure.
Therefore, theproposedchangemeetstheeligibility criteriaforcategorical exclusion setforthin10CFR51.22(c)(9)
~Therefore, pursuantto10CFR51.22(b),
anenvironmental assessment oftheproposedchangeisnotrequired.
InsertAl678.-3)sIceBedgceCondenser) 3.6.15SURILLANCEREUIREMENTS continued SURVEILLANCE FREQUENCY SR3.6.15.2Verifytotalweightofstoredice>=[2,721,600) lbby:4nof181DELETEa.Weighingarepresentative sampleof>=14'tsaneriibasketco]lbofice;atthebeginning ofeachoperating cycleb.Calculating totalweightofstoredice,ata95%confidence level,usingallicebasketweightsdetermined inSR'3.6.15.2.a.
SR3.6.15.3Verifyazimuthal distribution oficeata95%confidence levelbysubdividing weights,asdetermined bySR3.6.15.2.a, intothefollowing groups:f181a.Group1-bays1through8;b.Group2-bays9through16;andc.Group3-bays17through24.Theaverageiceweightofthesamplebasketsineachgroup&omradialrows1,2,4,6,8,and9shallbe>=[1400)lb.SR3.6.15.4Verify,byvisualinspection, accumulation oficeorfrostonstructural memberscomprising flowchannelsthroughtheicecondenser is(=[0.38)inchthick.9months(continued)
WOGSTS3.6-54Rev1,04/07/95 0
IBASES~~<i-335IceBed(IceCondenser)
B3.6.15SURVEILLANCE SR3.6.15.1(continued)
REQUIREMENTS temperature condition.
ThisSRmaybesatisfied byuseoftheIceBedTemperature Monitoring System.SR3.6.15.2InsertBTheweighingprogramisdesignedtoobtainarepresentative sampleoftheicebaskets.Therepresentative sampleshallinclude6baskets&omeachofthe24icecondenser baysandshallconsistofonebasket&omradialrows1,2,4,6,8,and9.Ifnobasket&omadesignated rowcanbeobtainedforweighing, abasket&omthesamerowofanadjacentbayshallewDeleteTherowschosenincludetherowsnearesttheinsideandoutsidewallsoftheicecondenser (rows1and2,andSand9,respectively),
wherehettransferintotheicecondenser ismostlikelytoinfluence sublimation.
Verifying thetotalweightoficeensuresthatthereisadequateicetoabsorbtherequiredamountofenergytomitigatetheDBAs.[nsertConeormorebasketsIfabasketisfoundtocontain([1400]lbofesentative sampleof20additional basketseashallbeweihed.Theaveraggeweih'ese21baskets(thediscrepant basketandthe20additional baskets)shallbe>=[1400]lbata95%confidence level.Weighing20additional barnebaymtheeventaSurveillance revealstetontains([1400]lbensuresthatnoocalzoneexiststhatisgrosslydeficient inice,Suchazonecouldexperience earlymeltoutduringaDBAtransient, creatingapathfor'teamtopass uhtheicebedwithout eincdened.eFrequency osmonthswasbasedonicestoragetestsandtheallowance builtintotherequiredicemassoverandabovethemassassumedisafetyanalyses.
inexperience hasverifiedthat,withthemonthFrequency, theweightrequireemaintained withnosignificant degradation betweensurveillances lDSeitDWOGB3.6-156continued Rev1,04/0//95
BASESM7/--)3$IceBedgceCondenser)
B3.6.15SURVEILLANCE SR3.6.15.3PSQUIREMENTS (Continued)
ThisSRensuresthattheazimuthal distribution oficeisreasonably uniform,byverifying thattheaverageiceweightineachofthreethaiousoficecondenser basiswithinthelimit.TheFreuencomonthswasbasedonicestoragetestsandtheallowance builtintorequiredicemassoverandabovethemassassumanalyses.
Operating experience hasverifiedthat,withthmonthFrequency, theweightrequirements aremaintained withnosignificant degradation betweensurveillances.
f181SR3.6.15.4ThisSRensuresthatthefiowchannelsthroughtheicecondenser havenotaccumulated anexcessive amountoficeor&ostblockage.
Thevisualinspection mustbemadefortwoormoreflowchannelspericecondenser bayandmustincludethefollowing specificlocatioiis alongthefiowchannel:a.Pastthelowerinletplenumsupportstructures andturningvanes;b.Betweenicebaskets;c.Pastlattice&ames;d.Throughtheintermediate floorgrating;ande.'hroughthetopdeckfloorgrating.Theallowable
[0.38]inchthickbuildupoffrostoriceisbasedontheanalysisofcontainment responsetoaDBAwithpartialblockageoftheicecondenser flowpassages.
Ifaflowchannelinagivenbayisfoundtohaveanaccumulation of&ostorice>[0.38]inchthick,arepreseritative sampleof20additional flowchannels&omthesamebaymustbevisuallyinspected.
Iftheseadditional flowchannelsareallfoundtobeacceptable, thediscrepant flowchannelmaybeconsidered single,unique,andacceptable deficiency.
Morethanonediscrepant flowchannelinabayisnotacceptable, however.Theserequirements arebasedonthesensitivity ofthepartialblockageanalysistoadditional blockage.
TheWOGB3.6-157continued Rev1,04/07/95
(/('3wInsertANOTE-Ifoneormorebasketsinanicecondenser bayarefoundtocontain<[1400]lbsofice,arepresentative sampleofatleast20additional baskets&omthesamebayshallbeweighed.Theaverageweightoficeinthebasketsweighedinthespecified bayshallbe>[1400]Ibsata[95]%confidence level.InsertBTheselection criteriaandmethodology fortheweighingof144icecondenser basketswasdocumented intwoSERsissuedforthelicensing oftheD.C.CookNuclearFacility.
ThefirstSER,issuedasSupplement 5oftheoriginalD.C.CookSERonJanuary16,1976(LetterN76007),addressed theweighingof96icebasketsanddefinedthestatistical methodsforanalyzing thedata.ThesecondSERwasissuedasletterN77016onFebruary16,1977andaddressed thereasonsforincreasing thesamplesizeto144icebaskets.InsertCThetotaliceweightdefinedinthisSRistheminimumrequirediceweightforthebeginning ofanoperating cycle.Asublimation allowance hasbeenprovidedtoensuresufficient iceisavailable attheendoftheoperating cyclefortheicecondenser toperformitsintendeddesignfunction.
ThisSRhasbeenmodifiedbyanotethatindicates ifoneormorebasketsarefoundtocontain<[1400]lbofice,arepresentative sampleofatleast20additional basketsfromthesamebayshallbeweighedandthattheaverageweightoficeinthebasketsweighedinthespecified bay(thediscrepant basket(s),
theremaining originally selectedbaskets,andthe20additional baskets)shallbe2[1400]lbata[95]%confidence level.InsertDTheaverageweightfigureof[1400]lbsoficeperbasketcontainseitheraconservative allowance foricelossthroughsublimation whichhasbeendetermined byplantspecificanalysisoradefined[15]%allowance.
Theminimumweightfigug'eof[2,721,600]
lbsoficealsocontainsanadditional fl]%conservative allowance toaccountforsystematic errorinweighinginstruments.
Intheeventthatobservedsublimation ratesareequaltoorlowerthandesignpredictions.
afterthreeyearsofoperation, theminimumicebasketweightsmaybeadjustedd0wilwai'd.
Attachment 3NKKG1432,Revision1Technical Specification 3.6.15RevisedPages SURVEILLANCE REUIREMENTS continued IceBedgceCondenser) 3.6.15SURVEILLANCE FREQUENCY SR3.6.15.2NOTEIfoneormorebasketsinanicecondenser bayarefoundtocontain([1400]lbsofice,arepresentative sampleof20additional baskets&omthesamebayshallbeweighed.Theaverageweightoficeinthebasketsweighedinthespecified bayshallbe~[1400]lbsata[95]%confidence level.Verifytotalweightofstorediceatthebeginning ofeachoperating cycleis>=[2,721,600]
lbby:[18]monthsa.Weighingarepresentative sampleof>=144icebasketsandb.Calculating totalweightofstoredice,ata95%confidence level,usingallicebasketweightsdetermined inSR3.6.15.2.a.
SR3.6.15.3Verifyazimuthal distribution oficeata95%confidence levelbysubdividing weights,asdetermined bySR3.6.15.2.a, intothefollowing groups;[18]months~~a.Group1-bays1through8;b.Group2-bays9through16;andc.Group3-bays17through24.Theaverageiceweightofthesamplebasketsineachgroup&omradialrows1,2,4,6,8,and9shallbe>=[1400]lb.WOGSTS3.6-54Rev1,04/07/95 IceBedgceCondenser) 3.6.15SURVEILLANCE REUIREMENTS continued SURVEILLANCE FREQUENCY SR3.6.15.4Verify,byvisualinspection, accumulation oficeor&ostonstructural memberscomprising Qowchannelsthroughtheicecondenser is<=[0.38]inchthick.9monthsSR3.6.15.5Verifybychemicalanalysesofatleastninerepresentative samplesofstoredice:a.Boronconcentration is>=[1800]ppm;and18monthsb.pHis>=[9.0]and<=[9.5].SR3.6.15.6Visuallyinspect,fordetrimental structural wear,cracks,corrosion, orotherdamage,twoicebasketsfromeachazimuthal groupofbays.SeeSR3.6.15.3.
I40months AES7$(F-2)~IceBed(iceCondenser)
B3.6.15SURVEILLANCE REQUIREMENTS SR3.6.15.1(continued) temperature condition.
ThisSRmaybesatisfied byuseoftheIceBedTemperature Monitoring System.SR3.6.15.2Theweighingprogramisdesignedtoobtainarepresentative sampleoftheicebaskets.Therepresentative sampleshallinclude6baskets&omeachofthe24icecondenser bays'ndshallconsistofonebasket&omradialrows1,2,4,6,8,and9.Ifno%asket&omadesignated rowcanbeobtainedforweighing, abasket&omthesamerowofanadjacentbayshallbeweighed.Theselection criteriaandmethodology fortheweighingof144icecondenser basketswasdocumented intwoSERsissuedforthelicensing oftheD.C.CookNuclearFacility.
ThefirstSER,issuedasSupplement 5oftheoriginalD.C.CookSERonJanuary16,1976(LetterN76007),addressed theweighingof96icebasketsanddefinedthestatistical methodsforanalyzing thedata.ThesecondSERwasissuedasletterN77016onFebruary16,1977andaddressed thereasonsforincreasing thesamplesizeto144icebaskets.Therowschosenincludetherowsnearesttheinsideandoutsidewallsoftheicecondenser (rows.land2,and8and9,respectively),
whereheattransferintotheicecondenser ismostlikelytoinfluence sublimation.
Verifying thetotalweightoficeensuresthatthereisadequateicetoabsorbtherequiredamountofenergytomitigatetheDBAs,ThetotaliceweightdefinedinthisSRistheminimumrequirediceweightforthebeginning ofanoperating cycle.Asublimation allowance hasbeenprovidedtoensuresufficient iceisavailable attheendoftheoperating cyclefoitheicecondenser toperformitsintendeddesignfunction.
ThisSRhasbeenmodifiedbyanotethatindicates ifoneormorebasketsarefoundtocontain<[1400]lbofice,arepresentative sampleof20additional basketsfromthesamebayshallbeweighedandthattheaverageweightoficeinthebasketsweighedinthespecified bay(thediscrepant basket(s),
theremaining originally selectedbaskets,andthe20additional baskets)shallbe2[1400]lbata[95]%confidence level.Weighing20additional baskets&omthesamebayintheeventaSurveillance revealsthatoneormorebasketscontains<[1400]lbensuresthat'nolocalzoneexiststhatisgrosslydeficient inice.Suchazonecouldexperience earlymeltoutduringaDBAtransient, creatingapathforsteamtopassthroughtheicebedwithoutbeingcondensed.
TheFrequency of18monthswasbasedonicestoragetestsandtheallowance builtintotherequiredicemassoverandabovethemassassumedinthesafetyanalyses.
Theaverageweightfigureof[1400]lbsoficeperbasketcontainseitheraconservative allowance foricelossthroughsublimation whichhasbeendetermined byplantspecificanalysisoradefined[15]loallowance whichisafactorof[15]higherthanassumedfortheicecondenser design.
/~r/=-32S-Theminimumweightfigureof';2,721,600]
lbsoficealsocontainsanadditional
[1]%conservative allowance toaccountforsystematic errorinweighinginstruments.
Inthe'ventthatobservedsublimation ratesareequaltoorlowerthandesignpredictions afterthreeyearsofoperation, theminimumicebasketweightsmaybeadjusteddownward.
Operating experience hasverifiedthat,withthe18monthFrequency, theweightrequirements aremaintained withnosignificant degradation betweensurveillances WOGB3.6-156continued Rev1,04/07/95.
ASES/zan'--'35IceBedgceCondenser)
B3.6.15SURVEILLANCE SR3.6.15.3REQUIREMENTS (Continued)
ThisSRensuresthattheazimuthal distribution oficeisreasonably uniform,byverifying thattheaverageiceweightineachofthreeazimuthal groupsoficecondenser baysiswithinthelimit.TheFrequency of18monthswasbasedonicestoragetestsandtheallowance builtintotherequiredicemassoverandabovethemassassumedinthesafetyanalyses.
Operating experience hasverifiedthat,withthe18monthFrequency, theweightrequirements aremaintained withnosignificant degradation betweensurveillances.
SR3.6.15.4TliisSRensuresthattheflowchannelsthroughtheicecondenser havenotaccumulated anexcessive amountoficeorfrostblockage.
Thevisualinspection mustbemadefortwoormoreflowchannelspericecondenser bayandmustincludethefollowing specificlocations alongtheflowchannel:Pastthelowerinletplenumsupportstructures andturningvanes;b.Betweeriicebaskets;c.Pastlattice&ames;d.Throughtheintermediate floorgrating;ande.Throughthetopdeckfloorgrating.Theallowable f0.38]inchthickbuildupoffrostoriceisbasedontheanalysisofcontainment responsetoaDBAwithpartialblockageoftheicecondenser flowpassages.
Ifaflowchannelinagivenbayisfoundtohaveanaccumulation offrostorice)[0.38]inchthick,arepresentative sampleof20additional flowchannelsfromthesamebaymustbevisuallyinspected.
Iftheseadditional flowchannelsareallfoundtobeacceptable, thediscrepant flowchannelmaybeconsidered single,unique,andacceptable deficiency.
Morethanonediscrepant flowchannelinabayisnotacceptable, however.Theserequirements arebasedonthesensitivity ofthepartialblockageanalysistoadditional blockage.
TheWOGB3.6-157continued Rev1,04/07/95 Attachment 4NUREG1432,Technical Specification 3.6.15Information OnlyPages
ThisPageisForInformation OnlyandisNotPartoftheProposedTSTF3.6CONTAINMENT SYSTEMS3.6.15IceBedgceCondenser)
P(rc"33mIceBedgceCondenser)
B3.6.15LCO3.6.15TheicebedshallbeOPERABLE.
APPLICABILITY:
MODES1,2,3,and4.ACTIONSCONDITION REQUIREDACTIONCOMPLETION TIMEA.Icebedinoperable.
B.RequiredActionand~associated Completion Timenotmet.A.1RestoreicebedtoOPERABLEstatus.B.1BeinMODE3.48hours6hoursB.2BeinMODE5.36hoursSURVEILLANCE REUIREMENTS SURVEILLANCE SR3.6.15.1Verifymaximumicebedtemperature is(=[27]oF.FREQUENCY 12hours(continued)
WOGSTS3.6-53Rev1,04/07/95 (WOG-140, Rev.0)Industry/TSTF StandardTechnical Specification ChangeTravelerIcebedflowchannelblockagesurveillance requirement Classification:
3)ImproveSpecifications NUREGsAffected:
t1430~14311432!14331t1434TSTF-336Description:
TheproposedchangewouldrevisetheIceBedTechnical Specifications (TS)andassociated TSBasesinsurveillance requLrement (SR)3.6.15.4.
Theproposedchangereplacesthecurrentvisualinspection requirement thatusesa0.38inchice/frost buildupcriteria.
Theproposedchangeisavisualsurveillance programthatprovidesatleast95percentconfidence levelthatflowblockagedoesnotexceedthe15percentblockageofthetotalflowareaassumedintheaccidentanalyses.
Whereas,the0.38inchprogramrequiredinspection ofasfewastwofiowchannelspericecondenser bay,thenewprogramwillrequireatleast54(33percent)ofthe162flowchannelsperbaytobeinspected.
TheproposedchangerevisesSR3.6.15.4&equencyinterval&om9monthsto18monthsforfiowpassageinspection oftheicecondenser.
Thesurveillance isintendedtobeperformed following outagemaintenance asanasleftsurveillance.
Thischangealsoproposestorevisetheapplicability
&om"flowchannelsthroughtheicecondenser" to"fiowchannelsthroughtheicebed".'AproposedrevisiontotheTSBasesclarifies whichstructures aretobinspected.
Therevisionlimitsthestructures tobeinspected toonlyinclude"betweenicebaskets"and"pastlaniceframesandwallpanels".TheTSBasesrevisionalsoisexpandedtoexplainwhyotherstructures withintheicecondenser arenotinspected pertheSR.Theproposaldeletestheword"frost"&omtheSR.TheWestinghouse basesforfrostandiceasitappliestotheSRhavebeenaddedtotheTSBasestoexplainwhy&ostisnotanimpediment toair/steam flowthroughtheicecondenser.
Justification:
RecentindustryeventspromptedtheWOGIceCondenser Mini-Group (ICMG)toreviewicecondenser technical specifications toidentifyenhancements thatwouldprovidedirectcorrelation todesignbasesaccident(DBA)analyses.
DBAanalysesdemonstrate thatdesignlimitsforpressurization oflowercontainment subcomparunents andthesteelcontainment vesselwillnotbeexceededwith15percentblockageoftheicebedflowchannels.
ReviewofSR3.6.15.4determined thatthe0.38inchice/&ostbuildupcriteriadoesnotadequately provideforthefullintentofthesurveillance.
Throughdiscussions withWestinghouse, theICMGhasdetermined thatthereisnodirectcorrelation betweentheexistingstandardTS0.38inchcriteriaforice/frost accumulation onflowareastructural membersandthepercentage ofoverallfiowblockageassumedintheplantanalyses.
However,theproposedchangeprovidesanacceptance criteriaof15percentblockage, whichisdirectlyrelatedtothisfunctional requirement.
Frost,asrecognized byWestinghouse, isnotanimpediment tosteamandairflow.TheWestinghouse definitions for&ostandicehavebeenaddedtotheBasesofSR3.6.15.4, andfrostspecifically excludedasflowchannelblockagetoprecludepotential declarations ofinoperability duetofrostratherthanice.IceCondenser operability isassuredbynumerousmeansduringoperations.
Theicebedtemperature ismonitored atleastonceeverytwelvehourstoensuretemperatures arelessthanorequalto27F.Thisisaccomplished inaconservative mannerbyreviewing numerouspointsthroughout theicecondenser toensureallpointsarelessthanorequalto27F.Inadditiontothesurveillance requirements, therearealarmsinthecontrolroomthatwillindicatetotheoperatorifanyofthepointsbeingrecordedreach27F.Also,weeklyoperatortoursrequiretheoperators towalkdownthere&igeration systemtoevaluateitsabilitytofunction.
Thisincludeswalkingdownthechillers, airhandlingunits,andglycolpumpstoensurethattheyareinproperworkingorder.Thetoursalsorequiretheoperators toinspecttheintermediate deckdoorstoensuretheyarenotfrozenshut.Thishelpstoensurethatnoabnormaldegradation oftheicecondenser isoccurring duetocondensation orfrozendrainlinesinlocalized areas.IceCondenser operability isdemonstrated bytheperformance ofvariousprocedures.
procedures verifytheicebedi>>nTravelerRev.2.Copyright (C)199g,ExcelServicesCorporation.
UsebyExcelServicesassociates, utilityclients.andtheU.S.NuclearRegulatory Commission isgranted.Allotherusewithoutwrittenpermission isprohibited.
6/15/99 r~~,
~~(WOG-140, Rev.0)TSTF-336goodphysicalcondition.
Procedures alsovalidateassumptions usedintheaccidentanalysis.
Theflowpassageinspection isperformed toensuretheabsenceofabnormalicebeddegradation aswouldbeindicated ifaccumulations exceedtheSRacceptance criteriaTherequesttoincreasethesurveillance interval&omninemonthstoeighteenmonthswouldrequiretheperformance ofsuchicebedmonitoring duringrefueling outages.ICMGmembersbelievethatindustryimprovements inicebedinspection results,duetomodifiedmaintenance techniques thathavebeenimplemented, provideadequateassurance thattheicecondenser canmeetandevenexceeditsdesignfunctionwithoutperforming thesurveillance onaninemonth&equency.
ExamplesofOperating Experience andIndustryconcerted improvements:
>Improvedcontrolofdoorsduringmaintenance including appropriate penetiations forhosestominimizeicecondenser heatandhumiditygains.>Improved management ofwallandfioorde&ostcycles(ifused,occursonlyduringoutages).
>Improved preventative maintenance programsonIceCondenser coolingsystems.>Increased priorityonrepairofIceCondenser coolingsystems.>Improvedtrainingandprocedures foremptyingandrefilling ofbaskets,andsubsequent cleanup.>Improvedtrainingandprocedures forflowpassagesurveillances.
>Proposedincreaseinminimumsamplesizerequirement forflowpassagesurveillance.
>Proposedsurveillance acceptance criterion thateffectively alignswithDBAanalysisforoperability determination.
Improvedcontrolofmaintenance haslimitedthoseactivities withthepotential forsignificant fiowchannelblockagetoduringrefueling outages.Verifying anicebedisleftwithlessthanorequalto15%flowchannelblockageattheconclusion ofarefueling outageassurestheicebedwillremaininanacceptable condition forthedurationoftheoperating cycle.Duringtheoperating cycle,anexpectedamountoficesublimates andreformsas&ostonthecoldersurfacesintheIceCondenser.
However,frostdoesnotdegradeflowchannelflowarea.Therefore, flowchannelblockagesurveillance shouldonlyberequiredattheconclusion ofscheduled refueling outages.Thesurveillance will'ffectively demonstrate operability foranallowed18monthsurveillance period.IndustryContact:Buschbaum, DennyNRCContact:Giardina, Bob(254)897-5851301-314-3152dbuschb1tuelectric.corn lbb1nrc.govRevisionHistoryOGRevision0RevisionStatus:ActiveNextAction:NRCRevisionProposedby:McGuireRevisionDescription:
OriginalIssueOwnersGroupReviewInformation DateOriginated byOG:1!-Jun-99 OwnersGroupComments(NoComments)
OwnersGroupResolution:
ApprovedDate:11-Jun-99 TSTFReviewInformation TSTFr'eceived Date:11-Jun-99 DateDistributed forReview11-Jun-99 OGReviewCompleted:
~BWOGPWOGPCEOGstrBWROGTravelerRev.2.Copyright (C)l99g,ExcelServicesCorporation.
UsebyExcelServicesassociates, utilityclients,andtheU.S.NuclearRegulatory Commission isgranted.Allotherusewithoutwrittenpcnnission isprohibited.
6/I5/99
~~
~~(WOG-140, Rev.0)TSTF-336OGRevision0RevisionStatus:ActiveNextAction:NRCTSTFComments:
(NoComments)
TSTFResolution:
ApprovedDate:15-Jun-99 NRCReviewInformation NRCReceivedDate:16-Jun-99 NRCComments:
(NoComments)
FinalResolution:
NRCActionPendingFinalResolution Date:Incorporation IntotheNUREGsFiletoBBS/LANDate:TSTFInformedDate:NUREGRevIncorporated:
AffectedTechnical Specifications TSTFApprovedDate:SR3.6.15.4IceBed(IceCondenser)
SR3.6.15.4BasesIceBed(IceCondenser)
Bkgnd3.6.15BaseslceBed(iceCondenser) 6/l5/99TravelerRev.2.Copyright (C)l998.ExcelServicesCorporation.
UsebyExcelServicesassociates, utilityclients,andtheU.S.NuclearRegulatory Commission isgranted.Allotherusewithoutwrinenpermission isprohibited.
~~
(5pF-334Attachment 1Technical Specification 3.6.15NoSignificant HazardsConsideration NOSIGNIFICANT HAZARDSCONSIDERATION DETERMINATION
[UtilityName]hasconcluded thatoperation of[PlantName]Unit[X],inaccordance withtheproposedchangetothetechnical specifications
[oroperating license(s)],
doesnotinvolveasignificant hazardsconsideration.
[UtilityName]'sconclusion isbasedonitsevaluation, inaccordance with10CFR50.91(a)(1),
ofthethreestandards setforthin10CFR50.92(c).A.Theroosedamendment doesnotinvolvea'siificantincreaseintherobabil'it orconseencesofanaccidentreviouslevaluated.
NeithertheTSamendment northeTSBaseschangecanincreasetheprobability ofoccurrence ofanyanalyzedaccidentbecausetheyarenottheresultorcauseofanyphysicalmodification toicecondenser structures.
Forthecurrentdesignoftheicecondenser, thereisnocorrelation betweenanycrediblefailureofitandtheinitiation ofanypreviously analyzedevent.Regarding theconsequences ofanalyzedaccidents, theicecondenser isanengineered safetyfeaturedesigned, inpart,tolimitthecontainment sub-compartment andsteelcontainment vesselpressures immediately following theinitiation ofaLOCAorHELB.Conservative sub-compartment pressureanalysisshowsthiscriteriawillbemetifthereduction intheflowareaperbayprovidedforicecondenser air/steam flowchannelsislessthanorequalto15percent,orifthetotalflowareablockedwithineachlumpedanalysissectionislessthanorequaltothe15percentassumedinthesafetyanalysis.
Thepresent0.38inchfrost/ice buildupsurveillance criteria.onlyaddresses theacceptability ofanygivenflow.channel, andhasnodirectcorrelation betweenflowchannelsexceeding thiscriteriaandpercentoftotalflowchannelblockage.
Infact,itwasnevertheintentofthecurrentSRtomakesuchacorrelation.
Ifproblemswereencountered inmeetingthe0.38inchcriteria, itwasexpectedthatadditional inspection and-analysis, suchasprovidedintheproposedamendment, wouldbeperformed tomakesuchadetermination.
Thus,theproposedamendment forflowblockagedetermination providesthenecessary assurance thatflowchannelrequirements aremetwithoutadditional evaluations, andthuswillnotincreasetheconsequences ofaLOCAorHELB.Theproposedamendment alsorevisesthesurveillance frequency fromevery9monthstoevery18monthssuchthatitwillcoincidewithrefueling outages.Theelimination ofthemid-cycle surveillance doesnotsignificantly increasethecons'equence ofanaccidentpreviously evaluated.
Improv'ed controlofmaintenance haslimitedthoseactivities withthepotential forsignificant flowchannelblockagetoduringrefueling outages.Verifying anicebedisleftwithlessthanorequalto15%flowchannelblockageattheconclusion ofarefueling outageassurestheicebedwillremaininanacceptable condition forthedurationoftheoperating cycle.Duringtheoperating cycle,acertainamountoficesublimates andreformsasfrostonthecoldersurfacesintheIceCondenser.
However,frostdoesnotdegradeflowchannelflowarea.Thesurveillance willeffectively demonstrate operability foranallowed18monthsurveillance period.Therefore, increasing thesurveillance frequency doesnotaffecttheIceCondenser operation oraccidentresponse.
Limitingicebedflowchannelblockagetolessthanorequalto150ensuresoperation isconsistent withtheassumptions ofthedesignbasisaccident(DBA)analyses.
Therefore, theproposedamendment willnotincreasetheconsequences ofanyaccidentpreviously evaluated.
Theroosedamendment doesnotcreatetheossibilit ofanewordifferent
'kindofaccidentfromanaccidentreviouslevaluated.
Forsuchapossibility toexist,therewouldhavetobeeitheraphysicalchangetotheicecondenser, orsomechangeinhowitisoperatedorphysically maintained.
NoneoftheaboveistruefortheproposedTSamendment andTSBaseschange.Thereisnochangetotheexistingdesignrequirements orinputs/results ofanyaccidentanalysiscalculations.
Theroosedamendment doesnotinvolveasiificantreduction inamarinofsafetDesignBasisAccidentanalyseshaveshownthatwith85percentofthetotalflowareaavailable (uniformly distributed),
theicecondenser willperformitsintendedfunction.
Thus,thesafetylimitforicecondenser operability isamaximum15percentblockageofflowchannels.
SR3.6.15.4currently usesaspecificvalueof0.38inchbuilduptodetermine ifunacceptable frost/ice blockageexistsintheicecondenser.
However,thisspecificvaluedoesnothaveadirectcorrelation tothesafetylimitforblockageoficecondenser flowarea.TheproposedTSamendment requiresmoreextensive visualinspection (33percentoftheflowarea/bay) thaniscurrently described (2flowchannels/bay) intheTSBasesforSR3.6.15.4, thusproviding greaterreliability anda s~
MISC-g)<directrelationship totheanalytical safetylimits.ChangingtheTStoimplement asurveillance programthatismorereli'able andusesacceptance criteriaoflessthanorequalto15percentflowblockage, asallowedbytheTMDanalysis, willnotreducethemarginofsafetyofanyTS.Theproposedamendment alsorevisesthesurveillance frequency fromevery9monthstoevery18monthssuchthatitwillcoincidewithrefueling outages.Verifying anicebedisleftwithlessthanorequalto15%flowchannelblockageattheconclusion ofarefueling outageassurestheicebedwillremaininanacceptable condition forthedurationoftheoperating cycle.Duringtheoperating cycle,acertainamountoficesublimates andreformsasfrostonthecoldersurfacesintheIceCondenser.
However,frosthasbeendetermined tonotdegradeflowchannelflowarea.Thus,designlimitsforthecontinued safefunctionofcontainment sub-compartment wallsandthesteelcontainment vesselarenotexceededduetothischange.ENVZRONMENTAL ZMPACTCONSZDERATZON Theproposedchangedoesnotinvolveasignificant hazardsconsideration, asignificant changeinthetypesoforsignificant increaseintheamountsofanyeffluents thatmaybereleasedoffsite,orasignificant increaseinindividual orcumulative occupational radiation exposure.
Therefore, theproposedchangemeetstheeligibility criteriaforcategorical exclusion setforthin10CFR51.22(c)(9).Therefore, pursuantto10CFR51.22(b),
anenvironmental assessment oftheproposedchangeisnotrequired.
Attachment 2NIUI&G1431,Revision1Technical Specification3.6.15MarkedUpPages S
ig7F-336IceBedgceCondenser) 3.6.15SURVEILLANCE REUIREMENTS continued SURVEILLANCE
'FREQUENCY SR3.6.15.2Verifytotalweightofstorediceis~[2,721,600]
lbby:9monthsWeighingarepresentative sampleof~144icebasketsandverifying eachbasketcontains~[1400)Ibofice;andb.Calculating totalweightofstoredice,ata95%confidence level,usingallicebasketweightsdetermined inSR3.6.15.2.a.
R3.6.15.3Verifyazimuthal distribution oficeata95%confidence levelbysubdividing weights,asdetermined bySR3.6.15.2.a, intothefollowing groups:9monthsLGroup1-bays1through8;b.Group2-bays9through16;andc.Group3-bays17through24.Theaverageiceweightot'nesamplebasketsineachgroupfromradialrows1,2,4,6,8,and9shallbe~[1400]lb.SR3.6.15.4Verisualinspection, accumulation oficonstructural memberscornrisinannsti:ruhtheiceXones18edis(15percentblockageofhetotalfloware~,WOGSTS3.6-54 InsertATheicebasketscontaintheicewithintheicecondenser.
Theicebedisconsidered toconsistofthetotalvolumefromthebottomelevation oftheicebasketstothetopelevation oftheicebaskets.Theicebasketspositiontheicewithintheicebedinanarrangement topromoteheattransferfromsteamtoice.InsertBThisSRensuresthattheflowchannelsthroughtheicebedhavenotaccumulated iceblockagethatexceeds15percentofthetotalflowareathroughtheicebedregion.Theallowable 15percentbuildupoficeisbasedontheanalysisofthesu~mpartment responsetoadesignbasisLOCAwithpartialblockageoftheicecondenser flowchannels, Theanalysisdidnotperformdetailedflowareamodeling, butlumpedtheicecondenser baysintosixsectionsrangingfrom2.75baysto6.5bays.Individual baysareacceptable withgreaterthan15percentblockage, aslongas15percentblockageisnotexceededforanyanalysissection.Toprovidea95percentconfidence thatflowblockagedoesnotexceedtheallowed15percent,thevisualinspection mustbemadeforatfeast54(33percent)ofthe162flowchannelspericecondenser bay.Thevisualinspection oftheicebedflowchannelsistoinspecttheflowarea,bylookingdownfromthetopoftheicebed,andwhereviewisachievable upfromthebottomoftheicebed.Flowchannelstobeinspected aredetermined byrandomsample.Asthemostrestrictive icebedfiowpassageisfoundatalatticeframeelevation, the15percentblockagecriteriaonlyappliesto"fiowchannels" thatcomprisethearea:a.betweenicebaskets,andb.pastlatticeframesandwallpanels.Duetoasignificantly largerflowareaintheregionsoftheupperdeckgratingandthelowerinletplenumsupportstructures andturningvanes,agrossbuildupoficeonthesestructures wouldberequiredtodegradeairandsteamflow.Therefore, thesestructures areexcludedaspartofaflowchannelforapplication ofthe15percentblockagecriteria.
Industryexperience hasshownthatremovaloficefromtheexcludedstructures duringtherefueling outageissufficient toensuretheyremainoperablethroughout theoperating cycle.Removalofanygross'icebuildupontheexcludedstructures isperformed following outagemaintenance activities.
Operating experience hasdemonstrated thattheicebedistheregionthatisthemostflowrestrictive, duetothenormalpresenceoficeaccumulation onlatticeframesandwallpanels.Theflowareathroughtheicebasketsupportplatformisnotamorerestrictive flowareabecauseitiseasilyaccessible fromthelowerplenumandismaintained clearoficeaccumulation.
Thereisnomechanistically crediblemethodforicetoaccumulate ontheicebasketsupportplatformduringplantoperation.
Plantandindustryexperience hasshownthattheverticalflowareathroughtheicebasketsupportplatformremainsclearoficeaccumulation thatcouldproduceblockage.
Normallyonlyaglazemaydeveloporexistontheicebasketsupportplatformwhichisnotsignificant toblockageofflowarea.Additionally, outagemaintenance practices providemeasurestocleartheicebasketsupportplatformfollowing maintenance activities ofanyaccumulation oficethatcouldblockflowareas.Frostbuilduporlooseiceisnottobeconsidered asflowchannelblockage, whereasattachediceisconsidered blockageofaflowchannel.Frostisthesolidformofwaterthatislooselyadherent, andcanbebrushedoffwiththeopenhand.
IceBed(IceCondenser)
B3.6.15B3.6CONTAINMENT SYSTEMSB3.6.15IceBed(lceCondenser)
ADD1944BASESBACKGROUND Theicebedconsistsofove,721,60 Iboficestoredinbasketswithintheicecondenser.
Itsprimarypurposeistoprovidealargeheatsinkintheevent-ofareleaseofenergyfromaDesignBasisAccident(DBA)incontainment.
Theicewouldabsorbenergyandlimitcontainment peakpressureandtemperature duringtheaccidenttransient.
Limitingthepressureandtemperature reducesthereleaseoffissionproductradioactivity fromcontainment totheenvironment intheeventofaDBA.Theicecondenser isanannularcompartment encfosing approximately 300ooftheperimeter oftheuppercontainment compartment, butpenetrating theoperating decksothataportionextendsintothelowercontainment compartment.
Thelowerportionhasaseriesofhingeddoorsexposedtotheatmosphere ofthelowercontainment compartment, which,fornormalunitoperation, aredesignedtoremainclosed.Atthetopoftheicecondenser isanothersetofdoorsexposedtotheatmosphere oftheuppercompartment, whichalsoremainclosedduringnormalunitoperation.
Intermediate deckdoors,locatedbelowthetopdeckdoors,formthefloorofaplenumattheupperpartoftheicecondenser.
Thesedoorsalsoremainclosedduringnormalunitoperation.
Theupperplenumareaisusedtofacilitate surveillance andmaintenance oftheicebed.nsertAThisarrangement enancestheicecondenser's primaryfunctionofcondensing steamandabsorbing heatenergyreleasedtothecontainment duringaDBA.IntheeventofaDBA,theicecondenser inletdoors(locatedbelowtheoperating deck)openduetothepressureriseinthelowercompartment.
Thisallowsairandsteamtofiowfromthelowercompartment intotheicecondenser.
Theresulting pressureincreasewithintheicecondenser causestheintermediate deckdoorsandthetopdeckdoorstoopen,whichallowstheairtoflowoutoftheicecondenser intotheuppercompartment.
Steamcondensation withintheicecondenser limitsthepressureandtemperature buildupin(continued)
WOGSTSB3.6-151 S0 IceBed(IceCondenser)
B3.6.15BASESSURVEILLANCE SR3.6.15.3REQUIREMENTS(continued)
ThisSRensuresthattheazimuthal distribution oficeisreasonably uniform,byverifying thattheaverageiceweightineachofthreeazimuthal groupsoficecondenser baysiswithinthelimit.TheFrequency of9monthswasbasedonicestoragetestsandtheallowance builtintotherequiredicemassoverandabovethemassassumedinthesafetyanalyses.
Operating experience hasverNedthat,withthe9monthFrequency, theweightrequirements aremaintained withnosignificant degradation betweensurveillances.
SR3.6.15.4nsertBcontinued)
OGSTSB3.6-157 I
IceBed(IceCondenser)
B3.6.15BASESSURVEILLANCE REQUIREMENTS SR3.6.15.4(continued)
SR3.6.15.5Verifying thechemicalcomposition ofthestorediceensuresthatthestoredicehasaboronconcentration ofatleast[1800]ppmassodiumtetraborate andahighpH,p[9.0]andg[9.5],inordertomeettherequirement forboratedwaterwhenthemeltediceisusedintheECCSrecirculation modeofoperation.
Sodiumtetraborate hasbeenproveneffective inmaintaining theboroncontentforlongstorageperiods,anditalsoenhancestheabilityofthesolutiontoremoveandretainfissionproductiodine.ThehighpHisrequiredtoenhancetheeffectiveness oftheiceandthemeltediceinremovingiodinefromthecontainment atmosphere.
ThispHrangealsominimizes theoccurrence ofchlorideandcausticstresscorrosion onmechanical systemsandcomponents exposedtoECCSandContainment SpraySystemfluidsintherecirculation modeofoperation.
TheFrequency of[18]monthswasdeveloped considering thesefactsa.Longicestoragetestshavedetermined thatthechemicalcomposition ofthestorediceisextremely stable.b.Operating experience hasdemonstrated thatmeetingtheboronconcentration andpHrequirements hasneverbeenaproblem;andc.Someonewouldhavetoenterthecontainment totakethesample,and,iftheunitisatpower,thatpersonwouldreceivearadiation dose.SR3.6.15.6ThisSRensuresthatarepresentative samplingoficebaskets,whicharerelatively thinwalled,perforated cylinders, havenotbeendegradedbywear,cracks,corrosion, orotherdamage.Eachicebasketmustberaisedatleast12feetforthisinspection.
TheFrequency of(continued)
WOGSTSB3.6-158
~ViAttachment 3NIUI&G1431,Revision1Technical Specification 3.6.15RevisedPages
IceBedgceCondenser) 3.6.15SURVEILLANCE REUIRElvKNTS continued SURVEILLANCE FREQUENCY
'R3.6.15.2Verifytotalweightofstorediceis~[2,721,600]
Ibby:9monthsaoWeighingarepresentative sampleof~144icebasketsandverifying eachbasketcontains>[1400]lbofice;aildb.Calculating totalweightofstoredice,ata95%confidence level,usingallicebasketweightsdetermined inSR3.6.15.2.a.
R3.6.15.3Verifyazimuthal distribution oficeata95%confidence levelbysubdividing weights,asdetermined bySR3.6.15.2.a, intothefollowing groups:'monthsa.Group1-bays1through8;b.Group2-bays9through16;andc.Group3-bays17through24.Theaverageiceweightofthesamplebasketsineachgroupfromradialrows1,2,4,6,8,and9shallbep[1400]lb.SR3.6.15.4Verify,byvisualinspection, accumulation oficeonstructural memberscomprising flowchannelsthroughtheicebedisz15percentblockageofthetotalflowarea.18monthsWOGSTS3.6-54(continued)
C'I CPcs-)34IceBed(iceCondenser)
B3.6.15'3.6CONTAINMENT SYSTEMSB3.6.15lceBed(IceCondenser)
BASESBACKGROUND UTheicebedconsistsofover[2,721,600]
Iboficestoredin1944basketswithintheicecondenser.
ItsprimarypurposeistoprovidealargeheatsinkintheeventofareleaseofenergyfromaDesignBasisAccident(DBA)incontainment.
Theicewouldabsorbenergyandlimitcontainment peakpressureandtemperature duringtheaccidenttransient.
Limitingthepressureandtemperature reducesthereleaseoffissionproductradioactivity fromcontainment totheenvironment intheeventofaDBA.Theicecondenser isanannularcompartment enclosing approximately 300ooftheperimeter oftheuppercontainment compartment, butpenetrating theoperating decksothataportionextendsintothelowercontainment compartment.
Thelowerportionhasaseriesofhingeddoorsexposedtotheatmosphere ofthelowercontainment compartment, which,fornormalunitoperation, aredesignedtoremainclosed.Atthetopoftheicecondenser isanothersetofdoorsexposedtotheatmosphere oftheuppercompartment, whichalsoremainclosedduringnormalunitoperation..
Intermediate deckdoors,locatedbelow.thetopdeckdoors,formthefioorofaplenumattheupperpartoftheicecondenser.
Thesedoorsalsoremainclosedduringnormalunitoperation.
Theupperplenumareaisusedtofacilitate surveillance andmaintenance oftheicebed.lTheicebasketscontaintheicewithintheicecondenser.
Theicebedisconsidered toconsistofthetotalvolumefromthebottomelevation eftheicebasketstothetopelevation oftheicebaskets.Theicebasketspositiontheicewithintheicebedinanarrangement topromoteheattrains'.rfromsteamtoice.Thisarrangement enhancestheicecondenser's primaryfunctionofcondensing steamandabsorbing heatenergyreleasedtothecontainment duringaDBA.IntheeventofaDBA,theicecondenser inletdoors(locatedbelowtheoperating deck)openduetothepressureriseinthelowercompartment.
Thisallowsairandsteamtoflowfromthelowercompartment intotheicecondenser.
Theresulting pressureincreasewithintheicecondenser causestheintermediate deckdoorsandthetopdeckdoorstoopen,whichallowstheairtoflowoutoftheicecondenser intotheuppercompartment.
Steamcondensation withintheicecondenser limitsthepressureandtemperature buildupin(continued)
WOGSTSB3.6-151 CA7 IceBed(IceCondenser)
B3.6.15BASESSURVEILLANCE REQUIREMENTS SR3.6.15.4(continued) throughout theoperating cycle.Removalofanygrossicebuildupontheexcludedstructures isperformed following outagemaintenance activities.
Operating experience hasdemonstrated thattheicebedistheregionthatisthemostflowrestrictive, duetothenormalpresenceoficeaccumulation onlatticeframesandwallpanels.Theflowareathroughtheicebasketsupportplatformisnotamorerestrictive flowareabecauseitiseasilyaccessible fromthelowerplenumandismaintained clearoficeaccumulation.
Thereisnomechanistically crediblemethodforicetoaccumulate ontheicebasketsupportplatformduringplantoperation.
Plantandindustryexperience hasshownthattheverticalflowareathroughtheicebasketsupportplatformremainsclearoficeaccumulation thatcouldproduceblockage.
Normallyonlyaglazemaydeveloporexistontheicebasketsupportplatformwhichisnotsignificant toblockageofflowarea.Additionally, outagemaintenance practices providemeasurestocleartheicebasketsupportplatformfollowing maintenance activities ofanyaccumulation oficethatcouldblockflowareas.Frostbuilduporlooseiceisnottobeconsidered asflowchannelblockage, whereasattachediceisconsidered blockageofaflowchannel.Frostisthesolidformofwaterthatislooselyadherent, andcanbebrushedoffwiththeopenhand.SR3.6.15.5Verifying thechemicalcomposition ofthestorediceensuresthatthestoredicehasaboronconcentration ofatleast[1800]ppmassodiumtetraborate andahighpH,p[9.0]andg[9.5],inordertomeettherequirement forboratedwaterwhenthemeltediceisusedintheECCSrecirculation modeofoperation.
Sodiumtetraborate hasbeenproveneffective inmaintaining theboroncontentforlongstorageperiods,anditalsoenhancestheabilityofthesolutiontoremoveandretainfissionproductiodine.ThehighpHisrequiredtoenhancetheeffectiveness oftheiceandthemeltediceinremovingiodinefromthecontainment atmosphere.
ThispHrangealsominimizes theoccurrence ofchlorideandcausticstresscorrosion onmechanical systemsandcomponents exposedtoECCSandContainment (continued)
WOGSTSB3.6-158 Page1of2Tennessee ValleyAuthority SEQUOYAHNUCLEARPLANTWATTSBARNUCLEARPLANTCC:Mr.J.A.ScaliceChiefNuclearOfficerandExecutive VicePresident Tennessee ValleyAuthority 6ALookoutPlace1101MarketStreetChattanooga, Tennessee 37402-2801 Mr.KarlW.Singer,SeniorVicePresident NuclearOperations Tennessee ValleyAuthority 6ALookoutPlace1101MarketStreetChattanooga, TN37402-2801 Mr.JackA.Bailey,VicePresident Engineering
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~~Page2of2LTennessee ValleyAuthority
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&Conservation DivisionofRadiological Health3rdFloor,LandCAnnex401ChurchStreetNashville, TN37243-1532 McGuireNuclearStationCC:Ms.LisaF.VaughnLegalDepartment (PBO5E)DukeEnergyCorporation 422SouthChurchStreetCharlotte, NorthCarolina28201-1006 CountyManagerofMecktenburg County720EastFourthStreetCharlotte, NorthCarolina28202MichaelT.CashRegulatory Compliance ManagerDukeEnergyCorporation McGuireNuclearSite12700HagersFerryRoadHuntersville, NorthCarolina28078J.MichaelMcGarry,III,EsquireWinstonandStrawn1400LStreet,NW.Washington, DC20005SeniorResidentInspector c/oU.S.NuclearRegulatory Commission 12700HagersFerryRoadHuntersville, NorthCarolina28078Dr.JohnM.BarryMecklenberg CountyDepartment ofEnvironmental Protection 700N.TryonStreetCharlotte, NorthCarolina28202Mr.StevenP.ShaverSeniorSalesEngineerWestinghouse ElectricCompany5929CarnegieBlvd.Suite500Charlotte, NorthCarolina28209Ms.KarenE.LongAssistant AttorneyGeneralNorthCarolinaDepartment ofJusticeP.O.Box629Raleigh,NorthCarolina27602L.A.KellerManager-NuclearRegulatory Licensing DukeEnergyCorporation 526SouthChurchStreetCharlotte, NorthCarolina28201-1006 ElaineWathen,LeadREPPlannerDivisionofEmergency Management 116WestJonesStreetRaleigh,NorthCarolina27603-1335 Mr.RichardM.Fry,DirectorDivisionofRadiation Protection NorthCarolinaDepartment ofEnvironment, HealthandNaturalResources 3825BarrettDriveRaleigh,NorthCarolina27609-7721 Mr.T.RichardPuryearOwnersGroup(NCEMC)DukeEnergyCorporation 4800ConcordRoadYork',SouthCarolina29745Mr.H.B.BarronVicePresident, McGuireSiteDukeEnergyCorporation 12700HagersFerryRoadHuntersville, NC28078-8985 IC CatawbaNuclearStationCC:Mr.GaryGilbertRegulatory Compliance ManagerDukeEnergyCorporation 4800ConcordRoadYork,SouthCarolina29745Ms.LisaF.VaughnLegalDepartment (PB05E)DukeEnergyCorporation 422SouthChurchStreetCharlotte, NorthCarolina28201-1006 AnneCottington, EsquireWinstonandStrawn1400LStreet,NWWashington, DC20005NorthCarolinaMunicipal PowerAgencyNumber11427Meadowwood Boulevard P.O.Box29513Raleigh,NorthCarolina27626CountyManagerofYorkCountyYorkCountyCourthouse York,SouthCarolina29745PiedmontMunicipal PowerAgency121VillageDriveGreer,SouthCarolina29651Ms.KarenE.LongAssistant AttorneyGeneralNorthCarolinaDepartment ofJusticeP.O.Box629Raleigh,NorthCarolina27602ElaineWathen,LeadREPPlannerDivisionofEmergency Management 116WestJonesStreetRaleigh,NorthCarolina27603-1335 NorthCarolinaElectricMembershi'p Corporation P.O.Box27306Raleigh,NorthCarolina27611SeniorResidentInspector U.S.NuclearRegulatory Commission 4830ConcordRoadYork,SouthCarolina29745VirgilR.Autry,DirectorDivisionofRadioactive WasteManagement BureauofLandandWasteManagement Department ofHealthandEnvironmental Control2600BullStreetColumbia, SouthCarolina29201-1708 L.A.KellerManager-NuclearRegulatory Licensing DukeEnergyCorporation 526SouthChurchStreetCharlotte, NorthCarolina28201-1006 SaludaRiverElectricP.O.Box929Laurens,SouthCarolina29360Mr.StevenP.ShaverSeniorSalesEngineerWestinghouse ElectricCompany5929CarnegieBlvd.Suite500Charlotte, NorthCarolina28209Mr.G.R.PetersonSiteVicePresident CatawbaNuclearStationDukeEnergy~',orooration 4800ConcordRoadYork,SouthCarolina29745-9635 4h' CatawbaNuclearStationCC:Mr.T.RichardPuryearOwnersGroup(NCEMC)DukeEnergyCorporation 4800ConcordRoadYork,SouthCarolina29745RichardM.Fry,DirectorDivisionofRadiation Protection NorthCarolinaDepartment ofEnvironment, Health,andNaturalResources 3825BarrettDriveRaleigh,NorthCarolina27609-7721 CC:RegionalAdministrator, RegionIIIU.S.NuclearRegulatory Commission 801Warrenville RoadLisle,IL60532-4351 AttorneyGeneralDepartment ofAttorneyGeneral525WestOttawaStreetLansing,Ml48913TownshipSupervisor LakeTownshipHallP.O.Box818Bridgman, Ml49106U.S.NuclearRegulatory Commission ResidentInspector's Office7700RedArrowHighwayStevensville, Ml49127JeremyJ.Euto,EsquireIndianaMichiganPowerCompanyNuclearGeneration Group500CircleDriveBuchanan, Ml49107Mayor,CityofBridgmanP.O.Box366Bridgman, MI49106SpecialAssistant totheGovernorRoom1-StateCapitoiLansing,Ml48909DonaldC.CookNuclearPlantUnits1and2DrinkingWaterandRadiological Protection DivisionMichiganDepartment ofEnvironmental Quality3423N.MartinLutherKingJrBlvdP.O.Box30630CPHMailroomLansing,Ml48909-8130 GordonArentDirector, Regulatory AffairsIndianaMichiganPowerCompanyNuclearGeneration Group500CircleDriveBuchanan, Ml49107DavidA.LochbaumUnionofConcerned Scientists 1616PStreetNW,Suite310Washington, DC20036-1495 A.Christopher Bakken,SiteVicePresident IndianaMichiganPowerCompanyNuclearGeneration GroupOneCookPlaceBridgman, Ml49106MichaelW.RencheckVicePresident, NuclearEngineering IndianaMichiganPowerCompanyNuclearGeneration Group500CircleDriveBuchanan, Ml49107Mr.RobertP.Powers,VicePresident IndianaMichiganPowerCompanyNuclearGeneration Group500CircleDriveBuchanan, MI49107
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