Patent ID: 8295425
Filing Date: 2012-10-23
Classification: G21C,Y02E

Abstract:
1. A fast reactor having a reactivity control reflector comprising: a reactor vessel in which a coolant is accommodated; a reactor core in the reactor vessel dipped with the coolant; a core barrel surrounding the outside of the reactor core; a partition wall spaced apart from and parallel to the core barrel; and a reflector interposed between the core barrel and the partition wall, outside the reactor core, and surrounding only a portion of the reactor core so that the reflector moves around a periphery of the reactor core in a vertical direction to control reactivity of the reactor core, the reflector being cylindrically shaped, wherein the reflector has a lower neutron reflecting portion having a neutron reflection capability higher than that of the coolant and an upper cavity portion located above the lower neutron reflecting portion and having a neutron reflection capability lower than that of the coolant, and the upper cavity portion is composed of a plurality of hermetically-sealed vessels, and wherein the hermetically-sealed vessels are cylindrically shaped, wherein the upper cavity portion includes a frame assembly that surrounds peripheries of the hermetically-sealed vessels, supports the lower neutron reflecting portion and restrains the upper cavity portion in a horizontal direction, wherein the hermetically-sealed vessels are surrounded by supporting rods and are arranged side by side, stacked and accommodated in the frame assembly where the frame assembly includes a coupling member and the supporting rods.