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Title: Nuclear reactor sealing system

A liquid metal-cooled nuclear reactor sealing system. The nuclear reactor includes a vessel sealed at its upper end by a closure head. The closure head comprises at least two components, one of which is rotatable; and the two components define an annulus therebetween. The sealing system includes at least a first and second inflatable seal disposed in series in an upper portion of the annulus. The system further includes a dip seal extending into a body of insulation located adjacent a bottom portion of the closure head. The dip seal comprises a trough formed by a lower portion of one of the components, and a seal blade pendently supported from the other component and extending downwardly into the trough. A body of liquid metal is contained in the trough which submerges a portion of the seal blade. The seal blade is provided with at least one aperture located above the body of liquid metal for providing fluid communication between the annulus intermediate the dip seal and the inflatable seals, and a body of cover gas located inside the vessel. There also is provided means for introducing a purge gas into the annulus intermediate the inflatable seals and the seal blade.more » The purge gas is introduced in an amount sufficient to substantially reduce diffusion of radioactive cover gas or sodium vapor up to the inflatable seals. The purge gas mixes with the cover gas in the reactor vessel where it can be withdrawn from the vessel for treatment and recycle to the vessel.« less
Authors:
 [1]
  1. (Calabasas, CA)
Publication Date:
OSTI Identifier:
864686
Report Number(s):
US 4401619
DOE Contract Number:
AT03-76SF76026
Resource Type:
Patent
Research Org:
ROCKWELL INTERNATIONAL CORP
Country of Publication:
United States
Language:
English
Subject:
nuclear; reactor; sealing; liquid; metal-cooled; nuclear; reactor; sealing; nuclear; reactor; vessel; sealed; upper; closure; head; closure; head; comprises; components; rotatable; components; define; annulus; therebetween; sealing; inflatable; seal; disposed; series; upper; portion; annulus; dip; seal; extending; insulation; located; adjacent; bottom; portion; closure; head; dip; seal; comprises; trough; formed; portion; components; seal; blade; pendently; supported; component; extending; downwardly; trough; liquid; metal; contained; trough; submerges; portion; seal; blade; seal; blade; provided; aperture; located; liquid; metal; providing; fluid; communication; annulus; intermediate; dip; seal; inflatable; seals; cover; gas; located; inside; vessel; provided; means; introducing; purge; gas; annulus; intermediate; inflatable; seals; seal; blade; purge; gas; introduced; amount; sufficient; substantially; reduce; diffusion; radioactive; cover; gas; sodium; vapor; inflatable; seals; purge; gas; mixes; cover; gas; reactor; vessel; withdrawn; vessel; treatment; recycle; vessel; liquid metal-cooled; bottom portion; purge gas; purge gas; purge gas; located inside; reactor vessel; nuclear reactor; nuclear reactor; nuclear reactor; liquid metal; liquid metal; liquid metal; upper portion; fluid communication; amount sufficient; located adjacent; cooled nuclear; cover gas; cover gas; cover gas; substantially reduce; closure head; closure head; closure head; dip seal; dip seal; dip seal; components define; sodium vapor; seal comprises; metal-cooled nuclear; providing fluid; reactor sealing; reactor sealing; extending downwardly; inflatable seal; inflatable seal; inflatable seal; inflatable seal; gas mixes; pendently supported /376/137/220/976/