Multi-zone natural-uranium reactor with graphite and heavy water as moderators

摘要

916,893. Reactors. DIEBNER, K. May 30, 1960 [May 30, 1959], No. 19019/60. Class 39 (4). In a breeder reactor, the core consists of the central zone I surrounded by the concentric zones II, III. Each of the three zones contain natural uranium. Zones I, III have graphite and zone II has heavy water as a moderator. The fuel rods 1 are cooled by an organic fluid flowing in the tubes 2. The graphite moderator is either gas or heavy water cooled. Plutonium is formed from the U238 in the natural uranium by the excess of neutrons formed in heavy water zones.