Boiling water reactor with downcomer steam release channel

Details Boiling water reactor with downcomer steam release channel Boiling water reactor with downcomer steam release channel

1991-10-17

1993-01-19

Behrend, Harvey E.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

376373, 376377, 376210, G21C 1500, G21C 1516

Patent

active

051805464

ABSTRACT:
A natural circulation boiling water reactor system using free-surface steam separation incorporates a series of tubes near the inner wall of its reaction vessel extending from a downcomer to well-above the downcomer. These tubes allow steam bubbles which would otherwise be trapped within the downcomer to escape from the recirculating water toward the steam exit of the vessel. This lowers the volume of steam in the downcomer, lowering the water velocity required to maintain a given volume of water recirculation. The reduced water velocity results in less carryunder which results in smaller voids in the reactor core. The smaller voids provide longer fuel burnups and enhance reactor stability.

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patent: 4576784 (1986-03-01), Kobayashi
patent: 4663116 (1987-05-01), Masuhara et al.

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