NUCLEAR FUEL COOLING METHOD AND NUCLEAR FUEL COOLING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a nuclear fuel cooling method that can cool a nuclear fuel even when cooling of the nuclear fuel by cooling water held in a plant is disabled.SOLUTION: When a cooling material loss accident takes place, a high pressure core flooder device 8 pours cooling water 36 in a condensate storage tank 15 into a reactor pressure vessel 2 provided with a reactor core having a fuel assembly loaded through cooling water supply pipes 14 and 10. When a water level in the condensate storage tank 15 is lowered to a set water level, an on-off valve 44 is not opened and cooling water 37 of a pressure suppression pool 6 cannot be poured into the reactor pressure vessel 2, sea water to be supplied by a sea water supply pipe 24 is supplied to a reverse osmosis membrane device 46 to generate plain water, and the generated plain water is supplied to the condensate storage tank 15 by a piping 26. The plain water is poured into the reactor pressure vessel 2 through the cooling water supply pipes 14 and 10 as the cooling water 36.