LMFBR type reactor

Heat generated in a reactor core is converted to electric power directly by thermoelectric conversion elements only by way of primary coolants. That is, a plurality of thermoelectric conversion elements are attached to the outside of a guard vessel. Air flow means are disposed at the periphery of the guard vessel for keeping the outer side of each of the thermoelectric power conversion elements at a predetermined low temperature. Then, electric power is generated by each of the thermoelectric conversion elements. Alternatively, one or more of fins are disposed at the outer wall of the guard vessel and a plurality of the thermoelectric conversion elements are attached to each of the fins and the outer wall. With such a constitution, direct electric power generation is enabled by the thermoelectric elements. Accordingly, the structure of the reactor is simplified and the size and the weight thereof are reduced. Further, the control for the electric power due to the control of the temperature difference can be facilitated. (I.S.)