Dispersed type reactor

Since conventional FBR type reactors require sodium pipeways, intermediate heat exchangers and pumps, etc., there is a problem in view of the reliability and the cost. Then, according to the present invention, a reactor core and a steam generator of a reduced size are combined as a modular structure and a plurality of them are disposed in a cooling vessel. Then, the heat generated in the reactor core is transmitted to the steam generator by natural convection and taken out of the reactor. In this way, sodium pipeways, intermediate heat exchangers and pumps are no more necessary to improve the reliability and economy. Change of power can be attained by increasing or decreasing the number of modules. Further, since the reactor core is reduced in the size, inherent safety is high and, even if one module has a trouble, heat of the reactor core can be removed by other modules. (N.H.)