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Experimental investigation on gas entrainment in reactor vessel using 1/1.8th scale model; Evaluation of onset condition under low liquid level condition at startup operation

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

An compact sodium-cooled fast reactor has been investigated in the Fast Reactor Cycle Technology Development Project. The compact-sizing may cause the cover gas entrainment (GE) at the free surface of reactor vessel. The prevention of gas entrainment is one of the significant thermal hydraulic issues. In the previous study, a water experiment in the 1/1.8 scale partial model was performed to check the adequacy of reactor design. From the result, it has been assured GE did not occur in the rated condition of reactor. However, there are the specific operating conditions with the low sodium level due to the thermal contraction concerning the cold startup or shutdown of reactor, where the sodium temperature is low. The objective of this study is to evaluate the onset condition of gas entrainment in those condition. The onset condition of GE was clarified in low liquid level. From the result, it was assured gas entrainment did not occur with the doubled D/P geometry.

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