Sodium circulating system for a reactor

Object: To provide an overglow system in a mechanical sodium pump, which eliminates the provision of an overflow column and makes it easy to install a guard vessel and minimizes entry of gas into sodium by passing it through an overflow tank. Structure: Overflown sodium in a circulating pump is once introduced into an overflowing tank in an overflowing system provided in order to maintain a highest liquid level within a reactor vessel constant, and the thus introduced sodium is pumped into the reactor vessel by a pumping electromagnetic pump thereby providing positive treatment without using the overflow column and without possibility of entry of gas. (Kamimura, M.)