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Report No.
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Experimental study on onset of gas entrainment by 1/1.8 scale model of sodium cooled fast reactor

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

Gas entrainment (GE) at free surface is one of the significant issues for the design of Japanese Sodium Cooled Fast Reactor. In the previous study, authors confirmed that GE did not occur at the rated operating mode in the reactor. In the present study, a water experiment to simulate the startup operation of reactor was performed in a large-scaled partial model of the reactor upper plenum in the reactor. 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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