Patent Number: 052290670
Section: claims

1. In a modular nuclear power plant having a reactor cavern with cooling surfaces, a liquid metal cooled nuclear reactor in the reactor cavern, comprising a reactor tank, a reactor core inside said reactor tank, at least one heat exchanger and primary pump inside said reactor tank, and a double tank of nodular graphite cast iron surrounding said reactor tank and serving as a heat accumulator, said double tank including a plurality of detachably interconnected and superposed rings and a base. 2. The nuclear reactor according to claim 1, wherein said rings to be interconnected and superposed and said base are reinforced at points of contact, and including means for screwing said rings and said base to one another by remote operation. 3. The nuclear reactor according to claim 1, wherein said rings and said base are interconnected to one another at respective points of contact, and including a plurality of annular seals, wherein two annular seals are disposed at each of said points of contact, and including a test bore leading to the outside between said seals. 4. In a modular nuclear power plant having a reactor cavern, a liquid metal cooled nuclear reactor in said reactor cavern, comprising a reactor tank, a reactor core inside said reactor tank, and a double tank of nodular graphite cast iron surrounding said reactor tank and serving as a heat accumulator.