Abstract
In the liquid metal cooled fast breeder reactor (LMFBR), a thin-wall weir is installed inside the main reactor vessel to form a circulation loop of cold sodium for protection of the main vessel from the hot coolant sodium. Under such conditions, there is a possibility of overflow-induced sloshing of the coolant coupled with vibration of the weir once observed in French Demonstration LMFBR “Super Phenix (SPx).”[1] Therefore it is very important for the safety assessment of LMFBR to study this sloshing-vibration instability. As a basic study, Fukuie and Hara[2] observed essentially the same instability by an experiment in a. 2D rectangular tank having a spring-supported rotatable weir.
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