APPARATUS TO REDUCE THERMAL STRESSES IN THE SLEEVE OF A DEVICE STEEPING IN LIQUID ALKALINE METAL COOLANT IN A FAST BREEDER NUCLEAR REACTOR

摘要

1. A device for the reduction of temperature differences that may exist at a given level between generatrices having a different angular position of a vertical sleeve (21) of an apparatus dipping into a pool (1) of liquid alkali metal in a fast neutron reactor and passing through the horizontal closure member (2) over said pool, characterized in that said sleeve has a temperature-homogenization means around its circumference comprising a concentric internal sleeve (13B) whose temperature is uniform around its circumference, and a series of metal plates (27) disposed perpendicularly to the axis of said sleeve (21) as vertically-spaced horizontal rings around the circumference of said sleeve, between the latter and an external jacket (24), and simultaneously providing biological portection against radioactive radiation, the space between the sleeve (21) and the internal sleeve (13B) being filled with an inert gas.