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MNSR Annual Operation Report

By Lauren Shaw,2014-12-15 04:40
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MNSR Annual Operation Report

    MNSR Annual Operation Report

    IMPORTANTNUCLEARINSTALLATIONANDEQUIPMENT245

    limit.Furthersampleandanalysisconfirmedslightleakageofheavywaterintosecondarycoolant.

    ConsequentlyHWRRwasshutdownonApril5.

    Zonesurfacesmearandmeasurementof3Hconcentrationofsecondarycoolantsamplewereusedto

    identifytheleakagesource.H

    3concentrationofsamplesaroundsealsoftwoheattransfertubesatline8, column8andline9,column9atinletsideofsecondarycoolantofmainheatexchangerBwasobviously

    higherthanothers.Thefactshowedmatbothsealswerepossiblytheleakagesource.Afterwelding.H3

    concentrationofsecondarycoolantreducedgradually,onApril13,itreachedthebackgroundleve1.

    OnMay18,2007,Hconcentrationofsecondarycoolantsamplereached3.9x10Bq/L,whichis

    aboveoperationallimit.AnalysisshowedslightleakageofheavywaterfrommainheatexchangerBinto

    secondarycoolant.Butadecisionwasmadethatpoweroperationcontinuedtofindoutthetrend.After

    then,H

    3concentrationofsecondarycoolantreducedgradually.OnMay24,itreachedlxl04aq/L, whichisalmostsameasnormaloperationallevel,thatistosayleakageceased. Botheventsshowedthattheageingofmainheatexchangerscausedpossibilityofmalfunction increase.Italsosuggestedthatageingmanagementbestrengthened,suchasestablishmentofageing

databaseandsurveillanceofequipmentstatus.

    Allof4abnormaleventsweretimelyandcorrectlytreated,thusnoactualsafetyconsequenceonthe

    reactorhappened.Theywerealsoreportedtotheregulatorybodywithintherequirementofabnormal

    eventreportingprogram.

    Aftereachevent,differentcorrectiveandpreventivemeasureshavebeenestablishedand implemented.Furthermore,throughtheprocessofjudgment,analysis,treatmentanddiscussionofthe

    events,operationalexperience,lessons,capabilitiesandawarenessareaccumulatedsoastoensurethe

    operationalsafety.

    MNSRAnnualOperationReport

    ZHUGuosheng

    Guidedbythenuclearsafetyroles,codeandstandardsofChina,MNSRperformedsafeoperationin

    2007.TheannualoperationreportofMNSRin2007isasfollows.

    11Licensees:4persons.

    2)Operationtimesof2007:47times.Flullpoweroperationamongthem:0. 3)Tbta1operationhours:353.1h.Equivalenthoursforfullpower:181.05h. 41Energyreleased:4888.35kW.h.

    5)Waterguilty:SpecificresistanceishJgherthan3xl05Q?cmforreactorwater;Specificresistanceis

    higherthan2xlOQ?cmforpoo1water.

    6)Eleetricityconsumption:24810kW.h.

    71NAASamples:414pcs.

    8)Maintenance:Oldfissionchamberwaschangedwithanewone.

    9)Dosage:Wiminthedoselimits.

    Thereare16personsinspected.IndividualannualdoserageisO.09

    0.81mSv;Totalannualcollective

dosageis5.79man?mSv;Averageannualindividualdoseis0-36mSv.CoHectiveexternalex

pose:within

regulatorylimit.

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