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US 11,854,709 B2Granted
Fast reactor with primary and backup control rods
AssigneeHitachi-GE Nuclear Energy, Ltd.
InventorsKoji Fujimura, Kazuhiro Fujimata, Sho Fuchita, Junichi Miwa
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Abstract
A fast reactor core includes a sodium plenum installed above the fuel. The sodium plenum is capable of reducing a void reactivity. During operation, a tip of a primary control rod is inserted in a core fuel region, and a tip of a backup control rod is arranged near an upper end of the sodium plenum.
Claims4
A core of a fast reactor including a sodium plenum installed above a core fuel, comprising:
- a core fuel region in which the core fuel is disposed;
- a sodium plenum region in which the sodium plenum is disposed;
- a primary control rod;
- and
- a backup control rod;
- wherein only a lower tip of the primary control rod is inserted into an upper end of the core fuel region in a normal operation state of the fast reactor, and
- in the sodium plenum region, in which the sodium plenum is disposed above an upper end of the core fuel region, only a central portion of the primary control rod above the lower tip of the primary control rod and only a lower tip of the backup control rod are arranged in the sodium plenum region in the normal operation state of the fast reactor,
- wherein the lower tip of the backup control rod is arranged at a position substantially same as an upper end of the sodium plenum for operation.
5 more elements
Dependencies are inferred from the claim text.