Fast nuclear reactor

A fast nuclear reactor comprising:

• a main vessel;
• a side wall of said main vessel being cylindrical in shape;
• the axis of said cylinder lying in the horizontal plane;
• at least two pipe branches penetrating said side wall of said vessel;
• a nuclear reactor core within said main vessel;
• heat exchangers comprised of tubes are also disposed within said main vessel;
• a liquid metal coolant filling said vessel and in said pipe branches;
• a means for circulating said liquid-metal coolant passing through said core and heat exchanger tubes;
• and an inert gas medium in said pipe branches and contacting said coolant therein;
• said reactor further including an additional tubular vessel arranged internally of said main vessel and surrounding said core and said heat exchangers;
• and an annulus defined between said vessels to form a conduit for the coolant to pass through in a direction from said heat exchanger towards said means for circulating the coolant.