Liquid-metal dip seal with pneumatic spring

Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device

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176 37, 137251, G21C 1306

Patent

active

040267636

ABSTRACT:
An improved liquid-metal dip seal for sealing the annulus between rotating plugs in the reactor vessel head of a liquid-metal fast-breeder nuclear reactor has two legs of differing widths communicating under a seal blade; the wide leg is also in communication with cover gas of the reactor and the narrow leg is also in communication with an isolated plug annulus above the seal. The annulus contains inert gas which acts as a pneumatic spring. Upon increasing cover gas pressure which depresses the level in the wide leg and greatly increases the level in the narrow leg, the pneumatic spring is compressed, and resists further level changes, thus preventing radioactive cover gas from bubbling through the seal.

REFERENCES:
patent: 2991905 (1961-07-01), Monson et al.
patent: 2995505 (1961-08-01), Guild
patent: 3253996 (1966-05-01), Bond, Jr. et al.
patent: 3522144 (1970-07-01), Webb et al.
patent: 3713461 (1973-01-01), Noteltiers
patent: 3819478 (1974-06-01), Thorel et al.
Proc. of the Breeder Reactor Corp., Proposed Reference Design for the Clinch River Breeder Reactor Plant, ERDA Tech. Inf. Center, P.O. Box 62, Oak Ridge, Tenn. 37830, CONF-741087, Oct. 1974, pp. 20-24.
Yevick et al., Fast Reactor Technology: Plant Design, MIT Press, 1966, pp. 368 & 369.

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