Fast reactor

A fast reactor comprising:

• a reactor vessel in which coolant is housed;
• a reactor core which is housed in the reactor vessel and which includes a fuel assembly;
• a core support plate which is fitted in the reactor vessel so as to support the reactor core;
• a reflector which surrounds the outer periphery of the reactor core and which can be moved in vertical direction;
• a partition which surrounds the reflector from the reactor vessel side thereof so as to form a flow channel of the coolant;
• a thermal shield which surrounds the partition from the reactor core side of the partition and/or the reactor vessel side thereof;
• a neutron shield which is provided in the flow channel of the coolant so as to surround the partition from the reactor vessel side thereof;
• an upper support plate which is fitted to the reactor vessel so as to support the reactor core, the partition, and the neutron shield;
• an intermediate heat exchanger which is set above the upper support plate;
• a pump which is provided in the flow channel of the coolant so as to drive the coolant;
• and
• an upper plug which is set in an upper part or above the reactor vessel and which includes a neutron shield layer and a thermal shield layer.