ML17221A713

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Forwards Addl Info on Proposed License Amend Re Boric Acid Concentration Reduction,Per NRC 880310 Telcon Request
ML17221A713
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 04/06/1988
From: CONWAY W F
FLORIDA POWER & LIGHT CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-88-168, NUDOCS 8804120332
Download: ML17221A713 (11)


Text

REGULAYINFORMATION DISTRIBUTIO YSTEM(RIDS)ACCESSION NBR:8804120332 DOC.DATE:88/04/ObNOTARIZED:

NOFACIL:50-335-St.

LuciePlantiUnitiiFloridaPower5LightCo.AUTH.NAMEAUTHORAFFIL1ATIONCONMAY>W.F.FloridaPower5LightCo.RECIP.NAMERECIPIENT AFFILIATION DocumentControlBranch(Document ControlDesk)DOCKET005000335

SUBJECT:

Forwardsaddiinfoonproposedlicenseamendreboricacidconcentration reductions perNRC880310request.DISTRIBUTION CODE:A001DCOPIESRECEIVED:

LTRiENCLISIZE:TITLE:ORSubmittal:

GeneralDistribution RECIPIENTIDCODE/NAME PD2-2LATOURIGNY>

EINTERNAL:

ACRSNRR/DEBT/ADS 7ENRR/DEST/ESB 8DNRR/DEST/RSB 8EILRB1201EXTERNAL:

LPDRNSICCOPIESLTTRENCL101166111111111111RECIPIENT IDCODE/NAME PD2-2PDARM/DAF/LFMB NRR/DEST/CEB 8HNRR/DEST/MTB 9HNRR/DOEA/TSB 11OQC15-B-18RES/DE/EIB NRCPDRCOPIESLTTRENCL5510111111101TOTALNUMBEROFCOPIESREQUIRED:

LTTR27ENCL24 JtI!)~0~~

OPPg3588Omb~PDRADOCH.0pjanFPLGroupcompany

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ST.LUCIEUNITIrcAcrocoNcErrrorrrrorr REovcrrOFPLRESPONSETONRCRE(VESTFORADDITIONAL INFORMATION I.Containment SumandSraHEvaluation Thefollowing abstractisprovidedtodelineate themethodology employedtoevaluatetheeffectthatreducedboricacidconcentrations wouldhaveontheContainment SumpandSpraypH:Aspartoftheboricacidconcentration reduction program,theexistingFloridaPower&LightContainment SumpandSpraypHcalculation wasrevisedtoreflectthenewoperating parameters fortheBoricAcidMakeup(BAN)Tanksasspecified byCombustion Engineering (Reference CELetterNo.F-CE-10325 datedOctober27,1987).Basedontheresultsoftherevisedcalculation, theoperating concentration rangeforSodiumHydroxide (NaOH)intheChemicalStorageTank(CHST)isamendedtoreflectlowerboricacidconcentrations asdelineated inproposedTechnical Specification 3.6.2.2.ToanalyzetheworstcasepHconditions, thecalculation involvedaniterative processwherebythemaximumandminimumboricacidconcentrations andwatervolumesforallavailable boratedwaterinventories wereconsidered.

Thecalculation wasseparated intotwoparts:1.Containment SumppHEvaluation; and2.Containment SpraypHEvaluation.

TheContainment SumppHEvaluation determined thehighandlowsumppHconsidering worstcasemixingofavailable boratedwaterinventories.

TheContainment SpraypHEvaluation determined thehighandlowcontainment spraynozzlepHduringbothinjection andrecirculation modes.TheContainment SpraypHEvaluation requiredtheanalysisofthefollowing conditions:

off-site, poweravailable, nofailures; off-sitepoweravailable, singlecontainment spraypumpavailable; andlossofoff-sitepower,singledieselgenerator available.

Whenthecalculation wasrevisedforthistask,allpartswerereworkedtodetermine potential impactontheoperating pHlimits.BasedontheresultsoftheContainment SpraypHEvaluation, thepHatthecontainment spraynozzleswasfoundtoexceedthemaximumallowedpHof11.0.Thiscondition wasfoundtoexistduringthebeginning ofrecirculation foreachofthethreecasesidentified above.Inordertomaintaincontainment spraypHwithintheallowable rangeof8.5-11.0,theCHSTNaOHconcentrations wereadjustedanditerations performed untiltankconcentrations wereconsistent withtherequiredpHvaluesatthespraynozzles.Theproposedmodification toTechnical Specification 3.6.2.2,ChemicalStorageTankNaOHconcentrations, (from30%-32%to28.5%-30.5%byweight)reflectthecalculation results.II.ReactorAuxiliarBuildinTemeratureMeasurement QUESTION:

Inregardstothesurveillance requiredwhentheReactorAuxiliary Buildingairtemperature isless-than55Fandconsidering thephysicalsizeofthemulti-level

building, pleasediscussthelocation(s) wheretheairtemperature(s) willbetakenandtherelationship betweenthelocation(s) andthelocation(s) ofallcomponents oftheBAMUsystem.RESPONSE:

Asdelineated inFigure1,theaffectedheattracedpiping/components whichcomprisetheBoricAcidMakeupsystem(i.e.theboricacidmakeuptanks,boricacidmakeup p>pingandpipingtoth~uction ofthechargingpumps~relocatedinrelatively'loseproximity ontheminM0.5ft.elevation oftheReaCWIAuxiliary Building.

Theexception istheboricacidmakeuptanks,whichhavetanktopsatelevation 32.75ft.asshownonFigure2.Inaddition, theReactorAuxiliary BuildingVentilation Systemisdesignedtomaintainauniformtemperature throughout thebuilding(

Reference:

FinalSafetyAnalysisReportSection9.4.2.2.1).Basedupontheabove,theReactorAuxiliary Buildingairtemperature measurement willbetakenattheBoricAcidMakeupStationasshownonFigure1.III.BoricAcidMakeuTankConcentration QUESTION:

ProposedTechnical Specification 3.1.2.8.a.requiresaboricacidweightpercentrangeof3.2/to3.5/.ProposedT.S.3.1.2.8.b.requiresasimilarrange.PleaseexplainthesetwoproposedTechnical Specifications inrelationship to(1)theproposedbasesstatements pertheproposedPage63/41-2Insert,(2)proposedFigure3.1-1,(3)FPL'sboricacidconcentration reduction safetyevaluation, and(4)Combustion Engineering ReportCEN-353.RESPONSE:

Asdelineated inproposedTechnical Specification Figure3.1-1,proposedPageB3/41-2Insert,andtheCombustion Engineering ReportCEN-353,thereduction ofboricacidconcentration to2.5/oto3.5%%ubyweightrequiresboratedwatervolumesof13,300(2.5/owt.)to8350(3.5/.wt.)gallons.Theboricacidmakeuptanksarecapableofholding9450gallonseach(thehighlevelalarmissetat97.5/ofthe9700gallontankcapacity).

Inordertomaintaintherequiredboratedwaterinventory inoneboricacidmakeuptankandcomplywiththeproposedTechnical Specifications, theboricacidconcentration mustbenolowerthan3.2Xbyweight.Technical Specifications 3.1.2.8.a.and3.1.2.8.b.arewrittentodelineate theboricacidconcentration requirements (3.2/.to3.5/)whenonlyoneboricacidmakeuptankiscreditedwithbeinginservice.IV.BoricAcidConcentration Reduction Uncertainties QUESTION:

Page3oftheFloridaPower&Lightboricacidreduction safetyevaluation specifies theuncertainties considered.

Pleaseprovide:1)abriefdiscussion oftheuncertainties utilizedforscramworth,moderator temperature coefficient andOopplercoefficient; and2)anexplanation fortheomissionofboronmeasurement uncertainties fromtheanalysis.

RESPONSE

Acombinedbiasanduncertainty of10%wasappliedto'hescramworthdatasuppliedtoCombustion Engineering fromFloridaPower5Light.Thiscombinedbiasanduncertainty is,consistent withthelicensing methodology usedbyFloridaPower5Light'sUnit'fuelvendor(ANF)tocalculate shutdownmargin.Thescramworthisadditionally conservative becauseitisassumedtnattnemostworthycontrolelementassemblyisstuckoutofthecoreduringthescram.Aconservative correction wasappliedtothemoderator cooldowncurvesuppliedtoCombustion Engineering fromFloridaPower8Light.SinceCombustion Engineering did notgeneratethemodera~temperature coefficient

(~curve,aconservative correction wasappliedto~iscurvetomakeitconsiste~with themethodsusedbyCombustion Engineering whengenerating acooldowncurveforthemostnegativetechnical specification MTClimitof-0.00028deltarho/F.Theapplication ofabiasof15/oandanuncertainty of151totheDopplercoefficients isconsistent withthelicensing methodology usedforanalogplants.Thesefactorswereusedintheanalysis.

Aboronmeasurement uncertainty wasincludedintheLouisiana Power&Lightphysicsdatawhenthenaturalcirculation scenarioassumedthattheboronometer concentration wouldbeusedtoverifyreactorcoolantsystem(RCS)boronconcentration.

Averyconservative boronometer measurement uncertainty (50ppm)wasaddedtotheRCSboronrequirements.

Areviewofthecooldownscenarioshowsthattheadditionofaboronometer measurement uncertainty totheRCSboronrequirements isunnecessary.

ThecooldownscenarioinCEN353(F)identifies theminimumvolumeofboricacidmakeuptankwaterwillensurethattheRCSisadequately borated.Theboronometer readingswillnotbeusedduringthecooldownasacriteriatoreducetheamountofboricacidmakeuptankwaterdelivered totheRCSduringthiscooldown.

Inconclusion, boronometer measurement uncertainties neednotbeincludedintheborationrequirement curvesforeitherplant.V.FIGURE3.1-1QUESTION:

InregardtoproposedFigure3.1-1,pleaseexplainwhyitisnecessary tohaveatthebottomofthefiguretheexpression" 1720ppmintheRWT."RESPONSE:

WehavereviewedFigure3.1-1andhavedetermined thattheexpression "1720ppmintheRWT"atthebottomofthefigureis'otnecessary.

Therefore, weproposetoremovethisexpression (SeeattachedrevisedFigure3.1-1).rVI.BorationSstemBasesOuringatelephone callonMarch16,1988betweentheNuclearRegulatory Commission St.LucieProjectManagerandFloridaPower&Light,afollowupquestionwasdiscussed regarding boricacidadditionvolumesasdelineated inTechnical Specification BasesPagesB3/41-2andB3/41-3.Theboronadditioncapability forModes5and6,asdiscussed onBasesPageB3/41-3,includedconservatisms outlinedinCEN-353(F),

"BoricAcidConcentration Reduction Effort."However,theboronadditioncapability forModes1-4,discussed onBasesPageB3/41-2,donotincludetheconservatisms outlinedinCEN-353(F).

Inordertoprovideconsistency intheBasesdiscussion, weproposetorevisetheboronrangesforModes1-4toincludetheappropriate conservatisms.(See attachedrevisedinsertPageB3/41-2).

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