Knowledge from recent investigations on sloshing motion in a liquid pool with solid particles for severe accident analyses of sodium-cooled fast reactor
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Investigations on the molten-pool sloshing behavior are of essential value for improving nuclear safetyevaluation of Core Disruptive Accidents (CDA) that would be possibly encountered for Sodium-cooledFast Reactors (SFR). This paper is aimed at synthesizing the knowledge from our recent studies onmolten-pool sloshing behavior with solid particles conducted at the Sun Yat-sen University. To bettervisualize and clarify the mechanism and characteristics of sloshing induced by local Fuel-CoolantInteraction (FCI), experiments were performed with various parameters by injecting nitrogen gas intoa 2-dimensional liquid pool with accumulated solid particles. It was confirmed that under differentparticle-bed conditions, three representative flow regimes (i.e. the bubble-impulsion dominant, transitional and bed-inertia dominant regimes) are identifiable. Aimed at predicting the regime transitionsduring sloshing process, a predictive empirical model along with a regime map was proposed on thebasis of experiments using single-sized spherical solid particles, and then was extended for coveringmore complex particle conditions (e.g. non-spherical, mixed-sized and mixed-density spherical particleconditions). To obtain more comprehensive understandings and verify the applicability and reliability ofthe predictive model under more realistic conditions (e.g. large-scale 3-dimensional condition), furtherexperimental and modeling studies are also being prepared under other more complicated actualconditions
Abstract
Investigations on the molten-pool sloshing behavior are of essential value for improving nuclear safetyevaluation of Core Disruptive Accidents (CDA) that would be possibly encountered for Sodium-cooledFast Reactors (SFR). This paper is aimed at synthesizing the knowledge from our recent studies onmolten-pool sloshing behavior with solid particles conducted at the Sun Yat-sen University. To bettervisualize and clarify the mechanism and characteristics of sloshing induced by local Fuel-CoolantInteraction (FCI), experiments were performed with various parameters by injecting nitrogen gas intoa 2-dimensional liquid pool with accumulated solid particles. It was confirmed that under differentparticle-bed conditions, three representative flow regimes (i.e. the bubble-impulsion dominant, transitional and bed-inertia dominant regimes) are identifiable. Aimed at predicting the regime transitionsduring sloshing process, a predictive empirical model along with a regime map was proposed on thebasis of experiments using single-sized spherical solid particles, and then was extended for coveringmore complex particle conditions (e.g. non-spherical, mixed-sized and mixed-density spherical particleconditions). To obtain more comprehensive understandings and verify the applicability and reliability ofthe predictive model under more realistic conditions (e.g. large-scale 3-dimensional condition), furtherexperimental and modeling studies are also being prepared under other more complicated actualconditions
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