Title of article
Modelingaspectsinlinearstabilityanalysisofaself-pressurized,naturalcirculationintegralreactorOriginalResearchArticle
Author/Authors
PZanocco، نويسنده , , MGiménez، نويسنده , , DDelmastro، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2004
Pages
20
From page
283
To page
302
Abstract
Thestabilityofaself-pressurizednaturalcirculationintegralreactorisstudiedbymeansofalinearapproach,takingtheCAREM-25reactorasreference.
Athermohydrauliccodehasbeenimprovedforanalysisoflinearstability,greatemphasishavingbeenplacedontheminimizationofnumericaldiffusionandintegrationerrors.Alinearizationmethodisimplementedbymeansofnumericalperturbations.Theresultsareobtainedwithinthefrequencydomain.Thecodeiscomparedtoasimpleranalyticalmodel,bycontrastingstabilitymapsobtainedfrombothmodelsforatestconfiguration,showinggoodagreement.
Inthistypeofreactor,oscillationsarepromotedbythetwo-phaseregimeinitslongriser,andtakeplaceduetothecounteractionbetweenmassflowandbuoyancyforce.
Thestabilityofthesystemisstronglyinfluencedbythesteam-domedynamics.Condensationinthesteamzone,togetherwithreactorpower,determinesthedynamicalstateofthesystem.
Thephase-lagintroducedbythecoredynamicregardingtherisertiming,togetherwiththesensitivityofthebuoyancyforceduetoflowchanges,determinesthesustainabilityoftheoscillation.Aparametricstudyiscarriedout,graduallyincreasingthecomplexityofthemodel,toanalyzetheinfluenceofdifferentfactorsontheoscillationsustainability,concerningphysicalprocessandmodelingapproaches.Theanalysisincludestherelativevelocitiesbetweenphases,theaxialpowerprofilealongthecore,thebuoyancyforceduetosubcooleddensitychanges,theflashingeffect,thecoredynamicandthepressurefeedbackduetoself-pressurization.Thesteam-dome-pressurefeedbackisidentifiedasastabilizingeffect,aslongasitdecreasesthesensitivityofthebuoyancyforce.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2004
Journal title
Nuclear Engineering and Design Eslah
Record number
894768
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