Title of article
Full-scalemodellingoftheMNSRreactortosimulatenormaloperation,transientsandreactivityinsertionaccidentsundernaturalcirculationconditionsusingthethermalhydrauliccodeATHLETOriginalResearchArticle
Author/Authors
A.Hainoun، نويسنده , , S.Alissa، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2005
Pages
20
From page
33
To page
52
Abstract
Afull-scaleATHLETsystemmodelfortheSyrianminiatureneutronsourcereactor(MNSR)hasbeendeveloped.Themodelrepresentsallreactorcomponentsofprimaryandsecondaryloopswiththecorrespondingneutronicsandthermalhydrauliccharacteristics.UndertheMNSRoperationconditionsofnaturalcirculation,normaloperation,stepreactivitytransientsandreactivityinsertionaccidentshavebeensimulated.TheanalysesindicatethecapabilityofATHLETtosimulateMNSRdynamicandthermalhydraulicbehaviourandparticularlytocalculatethecorecoolantvelocityofprevailingnaturalcirculationinpresenceofthestrongnegativereactivityfeedbackofcoolanttemperature.Thepredictedtimedistributionofreactorpower,coreinletandoutletcoolanttemperaturefollowcloselythemeasureddataforthequasisteadyandtransientstates.However,sensitivityanalysesindicatetheinfluenceofpressureformlosscoefficientsatcoreinletandoutletontheresults.Theanalysisofreactivityaccidentsrepresentedbytheinsertionoflargereactivity,demonstratesthehighinherentsafetyfeaturesofMNSR.Evenincaseofinsertionoftotalavailablecoldexcessreactivitywithoutscram,thehighnegativereactivityfeedbackofmoderatortemperaturelimitspowerexcursionandavoidsconsequentlytheescalationofcladtemperaturetothelevelofonsetofsub-cooledvoidformation.Thecalculatedpeakpowerinthiscaseagreeswellwiththedatareportedinthesafetyanalysisreport.TheATHLETcodehadnotpreviouslybeenassessedundertheseconditions.TheresultsofthiscomprehensiveanalysisensuretheabilityofthecodetotestsomeconceptualdesignmodificationsofMNSRʹscoolingsystemaimingtheimprovementofcorecoolingconditionstoincreasethemaximumcontinuousreactoroperationtimeallowingmoreeffectiveuseofMNSRforirradiationpurposes.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2005
Journal title
Nuclear Engineering and Design Eslah
Record number
894836
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