| 摘要 |
A reflector control type fast reactor 1 comprises: a reactor vessel 7 accommodating therein a primary coolant 5; a reactor core 2 disposed in the reactor vessel 7 and immersed in the primary coolant 5; and a reflector 4 that vertically moves for adjusting leakage of neutrons generated from the reactor core 2 to control a reactivity of the reactor core 2, the reflector 4 including a neutron reflecting part 4 a disposed on an outside of the reactor core 2 in a vertically movable manner, the neutron reflecting part 4 a having a neutron reflecting ability higher than that of the primary coolant 5, and a cavity part 4 b positioned above the neutron reflecting part 4 a, the cavity part 4 b having a neutron reflecting ability lower than that of the primary coolant 5. The neutron reflecting part 4 a is formed of a plurality of metal plates 37 that are stacked on each other. Each of the metal plates 37 has a plurality of coolant channels 36 through which the primary coolant 5 flows.
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