Patent Number: 044656530
Section: claims

1. A nuclear reactor of the type utilizing liquid as primary and secondary coolants, comprising: a reactor vessel for containing said primary coolant;  a core positioned in the reactor vessel for cooling via said primary coolant;  a plurality of primary liquid metal coolant circulation pumps positioned outside of said reactor vessel separately therefrom and not submerged in said primary coolant;  a plurality of intermediate liquid metal heat exchangers directly detachably mounted to an upper portion of the reactor vessel and extending into the interior of the reactor vessel for permitting heat exchange between the liquid metal primary coolant and the liquid metal secondary coolant, said intermediate heat exchangers being arranged in a circular configuration within said reactor vessel with the core serving as a center of said configuration and wherein said intermediate heat exchangers are at substantially the same elevational level as the core;  a substantially annular partition wall disposed between the intermediate heat exchangers and an inner wall portion of the reactor vessel defining an annular region containing liquid metal primary coolant and means for allowing the liquid metal primary coolant which is passed through each said intermediate heat exchanger after leaving the core to enter said annular region;  first pipe means for conducting the liquid metal primary coolant from said annular region to the outside of said reactor vessel and into each said primary coolant circulation pump; and  second pipe means for conducting the liquid metal primary coolant discharged from each said primary coolant circulation pump into said reactor vessel and to the bottom of the core in said reactor vessel.