SAFETY INFUSION TANK PROVIDED WITH GRAVITY DRIVEN FLOW CONTROLLER

PROBLEM TO BE SOLVED: To provide a safety infusion tank for filling a large amount of emergency core cooling water rapidly in a reactor vessel in a break accident of a large low temperature pipe of a pressurized light-water reactor type nuclear reactor. SOLUTION: A gravity driven flow controller 130 comprises a spring 131 arranged on an upper end of a vertical pipe 120, and a vertically moving water tank 132 arranged on the spring 131 and moving vertically. When the emergency core cooling water filled in an inside of a pressure vessel 110 of the safety infusion tank 100 is discharged outside from the vertical pipe 120, and a water level of the emergency core cooling water in the pressure vessel 110 is lowered than a vertical position of the vertically moving water tank 132, the vertically moving water tank 132, which is elastically supported by the spring 131, descends. Thereby, a lower surface of the vertically moving water tank 132 adheres to the vertical pipe 120, and a large flow inflow port 123 is closed. As a result, a flow rate is smoothly switched from large flow discharge to small flow discharge. COPYRIGHT: (C)2010,JPO&INPIT