Cooling system for the main vessel of a fast breeder reactor

摘要

The invention relates to a device for cooling the main vessel (3) of an integrated type fast neutron nuclear reactor. The annular space (19) limited by the main vessel (3) and an internal ferrule (16) is in communication with the zone (15) of the reactor vessel in which the cold primary liquid is located. The annular space (20) limited by the ferrule (16) and by an internal ferrule (17) is in communication with the lower part of the heart (7), via conduits (31). Thus, the cold primary liquid is injected into the space (20) where it circulates from bottom to top and flows into the space (19) where it circulates from top to bottom while cooling the main tank (3). The invention applies, in particular, to fast neutron nuclear reactors cooled by liquid sodium.