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Study on bubble behavior of inert gases at entrance nozzle in sodium-cooled fast reactor

Konaka, Yuji*; Takata, Takashi*; Yamaguchi, Akira*; Ito, Kei; Ohshima, Hiroyuki

Bubbles of inert gases exist in a primary coolant system of sodium-cooled fast reactor. Those bubbles may cause increase of reactivity in the core and cavitation erosion and so on. Therefore it is necessary from the viewpoint of reactor safety to understand the dynamic behavior of the bubbles. In this study, the model of gas transport at the entrance nozzle has been developed using a non-dimensional correlation based on a three-dimensional analysis of dynamic bubbles behavior. As a result, it has been demonstrated that the bubble behavior is influenced by the sodium flow field, bubble radius and the shape of the entrance nozzle. The authors have also developed a correlation for the gas behavior based on the dimensionless number which corresponds to the geometric, the buoyancy and the drag force effects acting on the bubble.

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