Pressurized water nuclear reactor comprising a primary coolant draining system with an intrinsic determined low water level safety

摘要

The device comprises a pipework (39) for abstracting water from the primary circuit, optionally incorporating a pump (35) connected to a circuit (31) for discharging the abstracted water. The water level in the primary circuit, at the end of the draining, remains at least equal to a determined low level. The device additionally comprises a water tank (36) connected in the vicinity of its lower part and in the vicinity of its upper part, respectively, to a member (4) of the primary circuit, such as a pipe, at two points of the member (4) at different levels, one of which is situated below the low drainage level and the other of which is situated at the low level or above. The abstraction pipework (39) is connected to the water tank (36) at a level corresponding to the low drainage level. The water level of the tank (36) becomes equal to the level in the primary circuit when the water is at the low level in the primary circuit. The abstraction pipework (39) then opens into a part of the water tank (36) receiving the primary circuit venting air. IMAGE