ML17254A890
| ML17254A890 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/26/1984 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17254A889 | List: |
| References | |
| NUDOCS 8408070526 | |
| Download: ML17254A890 (8) | |
Text
1aJune26,1984StartupPhysicsTestingProgramCycle14StartupPhysicsTestingProgramwasconducted duringtheperiodfromMay11,1984toJune88,1984.Thestateddatesspanfrominitialcriticality toattainment of188%power.Theresultsofthephysicstestingprogramshowedthatallmeasureddatawaswithintheboundsoftheacceptance criteriatolerances withexceptions asnotedbelow.ThePT-34seriesofprocedures wasusedtoperformthelowpowerphysicstestingmeasurements inconjunction withtheS-15seriesforfluxmapping.
Theprogramconsisted ofdetermining thefollowing parameters:
l.Allrodsoutcriticalboronconcentration 2.Isothermal Temperature coefficient 3.ControlRodWorthsforBanks"D","C"and"B"4.Boronendpoints 5.Coresymmetryandpowerdistribution measurements 6.Criticalboronconcentration
-FullPowerInitialcriticality wasachievedon85/12/84at8458hours.TheHotZeroPowerparameters aslistedin1thru4abovewerethenmeasured.
Thefluxsymmetrymappingandsubsequent powerescalation andmeasurement ofpowerdistribution andhotchannelfactorswasdelayeduntil5/23/84duetotheplantreturntocoldshutdownforsecondary chemistry concerns.
Thefollowing datasummarizes theresultsofthetestingprogram.CriticalMeasurements a~NuclearH~etDetermination:
Nuclearheatwasobservedat~4x18ampsonChannelN-41.Itwasdetermined fromthisthatalLreactivity measurements wouldbeperformed below2x18FullScaleampstostaybelownuclearheat.b.Reactiv~it ComputerCheckout:
Thereactorwasplacedonvaryingperiodstoprovideacomparison ofindicated reactivity withthatderivedfromperiodmeasurements.
Thefollowing tablesummarizes thecomputercheckout:
ControlBankTMeasured1Reactivity (PCM)TtDifference DStepsIReactorIl(M-P)x188Withdrawn IPeriod/SecondslMeasured (M)IPredicted (P)lP61826268'3157.298'523.1635.S652.5223~4536.153.1-1.25%.665-1.11%8408070526 840709.PDRADOCK05000244PPDR
)(ttIt~St'ItItr,IItIlJII4IJt qc~'Isothermal TempatureCoefficient:Heatpandcooldownratesofapproximately 18P7hr.wereestablished todetermine theisothermal temperature coefficient.
Thefollowing datasummarizes theresultsoftheaverageoftwoacceptable traces.TAccetanceIMTCIsARO-4.9INotPositiveI
-2.215+2.685IICore~MTCpDifference ConfigurationIPredicted (P)ICriteriaIMeasured (M)I(M-P)1lrNOTE:Moderator Temperature Coefficient
=ITC-(-1.66)d.ControlRodWorth:ControlRodworthwasmeasuredbyadjusting rodpositiontocompensate fordilution.
Thefollowing tablesummarizes theintegralrodworthdata.PredictMeasuredDifference CtrlI(P)BankI(PCM)PPMIM-P(PCM)ICriter.PPPM(M)IAccept.I(M-P)x188IPredictIMeasureIDiffDC*BSum946184218822998914.5995.5827.52737.5+15%+15%+15%+18%3~334.46-17.428.4418211418331912318398324+21-ll5+5Acceptance Criteria:
Theacceptance criteriaisthatthemeasuredindividual bankintegralworthbewithin15%ofthepredicted valuesandthatthetotalworthofthreebanksbewithin185ofthepredicted value.Ifthecriterion onindividual bankworthisnotmet,anevaluation willbeperformed todetermine thecauseandanypotential impacts.Ifthecriterion intotalworthofthethreebanksisnotmet,additional bankswillbemeasureduntilthemeasurement iswithin18%oftheprediction.
Thiswillbecontinued, ifnecessary, tomeasurement atanN-1rodinsertedcondition.
TheresultofanN-lmeasurement, withappropriate allowance formeasurement uncertainty, willbecomparedtothevalueassumedintheSafetyAnalyses.
Assummarized above,Bank"B"indicated adeviation ofpredicted rodworththatexceededtheacceptance criteriaof+15%.Thetotalrodworthforthethreebankshowever,didsatisfytheacceptance criteriaof+18' 0J~~fD
~,J'Thedeviation habeenevaluated bynuclear'engineering, and,ithasbeendetermined thatproceeding tofullpowerisacceptable forthefollowing reasons.Thetotalrodworthforthethreebanksmeasurediswithin+18%ofpredicted values,therefore, satisfying theassumptions outlinedintheshutdownmargincalcu-lation.2~Theshutdownmargincalculation (Table6.3oftheNuclearDesignReport)indicates thatexcessshutdownmarginof818pcmexiststotherequiredshutdownmarginof1888pcmatBOL.3~ThemeasuredARO,D,D+Cand,estimated D+C+Bboronendpointdatacomparewelltothepredicted valuesindicating thattheBbankdeviation doesnotrepresent anunanticipated corereactivity anomaly.TheWestinghouse nucleardesignerisconducting hisownevaluation todetermine thecauseofthedeviation.
Basedonthisevaluation, additional fluxmapdataandcomparison ofoverallcoreperformanceversuspredicted throughthecycle,itcanbedetermined atalaterdatewhethertoimposeahigherDbankinsertion limittowardendofcyclewheretheshutdownmarginisattheminimum.e.BoronEnd~oint:
Thefollowing tablesummarizes theboronendpointdata.rrTDifference Con~icauration (predicated (p)(acceptance(Measured (M)((M-p)ARODInsertedD+CInserted*D+C+BInsertedl 1329122711131818+75+75+75.+7513291286118318858-21-185Acceptance Criteria:
Theaveragecriticalboronconcentration foragivenconfiguration willbecomparedtothepredicted concentration forthatconfiguration.
Theacceptance criterion willbe+75ppm.Ifthisacceptance criterion isnotmet,themeasurement datawillbereviewedandthefuelsupplierwillbeaskedtoreviewhispredictions.
Concurrent withthisreviewtheremainder ofthezeropowerphysicstestingwillbecompleted toseeifanyotherdifferences arepresentthatcouldaidindetermining thecauseofnotmeetingtheacceptance criteria.
Ifaftertheaboveactions,theacceptance criterion stillcannotbemetanevaluation willbeperformed ontheeffectofthisdifference onparameters usedintheaccidentanalysis'f theaccidentanalysisisunaffected bythisdifference, thecorewillbeallowedtogoabove5%ratedpower.
t~II~IJ8II-IIlJttIIJ4ltttLIftIftCIIII'
~~~.~NOTE:Althoughthetestingprogramdidnotspecifymeasurement ofControlBank"B"PPMBoronNorthortheBoronEndpointforD+C+BInserted, sufficientacquiredboronsampledataexistedtoincludethestatedvaluewithreasonable confidence.
FluxSymmetryandPowerDistribution:
Thefluxsymmetryfluxmapwasperformed at23.6%ratedpower.Alllocations wereevaluated totheacceptance criteriaaslistedbelow.Theonlylocations tofalloutoftheacceptance bounds,werelocations I-5andI-6,whichrecorded-14.231%and-14.233%respectively.
Thethimbleusedtopredicttheselocations isI-5.ThisspecificassemblylocationisaMixedOxideAssembly(Plutonium enriched).
Theresultswereevaluated anditwasdetermined thatmodelingofthepowerdistribution forthisassemblywasthereasonforthedifference.
Theremainder ofthemapwasingoodagreement withpredictions andverifiedthecorewasproperlyloaded.AllNuclearHotChannelfactorswerewellwithintheboundsofPlantTechnical Specifications.
Duringsubsequent powerescalation, fluxmapsweregenerated at46$,71.5%withIncore/Excore calibration performed at83%power.Following areactor/turbine tripduetoanexciterfailure,powerescalation to188%wasachieved.
The188%mapwasthentakenon6/8/84,withallHotChannelFactorswellwithintheboundsofPlantTechnical Specifi-cations.A~ccetanceCriteria:
Theacceptance criterion forafluxmapisthattheplantTechnical Specification onpeakingfactorsbemet.Asanaidinevaluating thepowerdistribution maps,thedifferences betweenmeasuredandpredicted assemblypowerlevelsarereviewed.
Generalcriteriaforthesecomparisons arethatthedifference forassemblies withrelativepower<1'belessthan15%andthedifference forassemblies withrelativepower>1.8belessthan18%.Ifthesedifferences areexceeded, anevaluation shallbeperformed toensurethatthepeakingfactorTechnical Specifications willbemet.Ifsuchanevaluation indicates thatthepeakingfactorlimitswillbemet,nofurtheractionisnecessary.
geCriticalBoronConcentration
-FullPower:Duetothenumerousdelaysasaresultofsecondary concernsencountered duringstartup,HotFullPowerSteadystateconditions werenotattaineduntil6/8/84,whichrepresents anexposureof"388MWD/MTU.Thecalculated boronconcentration atthatpointwas888PPMwithapredicated valueof828PPM.Subsequent Boronmeasurements todateindicatethepredicated tocloselyapproximate theactualvaluesobtained.
RECElVEO-REGlON 1$85JULl2Plill:52~gfi~,~r~~~~~