TANK TYPE FAST BREEDER REACTOR

PURPOSE:To prevent a bubble from being flowed in a reactor core by connecting a delivery pipe of a primary main circulating pump between the reactor core and the primary main circulating pump in the tangential direction and coupling a bubbler opening on the side of a hot plenum approximately in the center thereof. CONSTITUTION:A reactor core bubble inflow preventing construction of a tank type fast breeder reactor is composed of a cyclone pipe part 10 between a primary main circulating pump 5 and a reactor core 1. In the normal operation liquid sodium which is flowed in from a suction pipe 6 of the primary main circulating pump 5 is pressurized by the pump 5, flowed out from a delivery pipe 12 and pumped in the reactor core 1. The liquid sodium which is delivered in the cyclone pipe part 10 from the pump 5 causes a whirl and so the liquid sodium and bubbles are separated each other in the case where the bubbles are mixed in the sodium, the bubbles are collected in the center part of the cyclone pipe part 10, and a gas centering cone is formed. The collected bubbles are exhausted in the side of a hot plenum 2 by means of the flow and buoyancy of the liquid sodium which always flows in a bubbler 13, and so the most part of the bubbles cannot be flowed in the reactor core 1.