FAST NEUTRON REACTOR

PROBLEM TO BE SOLVED: To obtain a fast neutron reactor which controls burnup of core fuels by a reflector and which has a reflector moving device having a simple structure and being capable of reducing maintenance frequency. SOLUTION: The high speed reflector moving device of the reflector is composed of a moving member 53 connected to the reflector 3 and a linear moving device stator 51 for driving the moving member 53. A superslow reflector moving device is composed of a wall surface electromagnet 57 which is attracted to surface of a base 55 used as a running face of a reflector moving device body 56 by electromagnetic attraction force and holds the reflector moving device body 56 by frictional force, a connecting electromagnet 58 which connects the moving element to which the reflector 3 is connected to the reflector moving device body, an inertia body 60 which is provided in vertically movable manner, an electromagnetic repulsive coil 59 which generates a momentary vertical electromagnetic repulsive force to/from the inertia body 60, and a spring element 61 which connects the electromagnetic repulsive coil 59 and the inertia body 60. COPYRIGHT: (C)2007,JPO&INPIT