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Report No.
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Experimental study of gas entrainment phenomena in sodium cooled fast reactor by 1/1.8 scale partial model

Ezure, Toshiki ; Kimura, Nobuyuki; Miyakoshi, Hiroyuki; Kamide, Hideki 

Gas entrainment (GE) at free surface is one of the significant issues for the design of Japan Sodium Cooled Fast Reactor. In the previous study, authors confirmed that GE did not occur under the conditions of the rated operating mode of the reactor. In the present study, a water experiment was performed in a large-scaled partial model of the reactor upper plenum to simulate the startup operation of reactor where the sodium level was lower than in the rated condition. The onset condition of GE was observed by the visualization of free surface. Vertical velocity distribution was also measured in order to qualify the mechanism of GE. As a result, it was confirmed that GE did not occur in the startup condition of reactor.

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