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Chimney for enhancing flow of coolant water in natural circulation boiling water reactor

United States Patent

5,857,006
January 5, 1999
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
A chimney which can be reconfigured or removed during refueling to allow vertical removal of the fuel assemblies. The chimney is designed to be collapsed or dismantled. Collapse or dismantlement of the chimney reduces the volume required for chimney storage during the refueling operation. Alternatively, the chimney has movable parts which allow reconfiguration of its structure. In a first configuration suitable for normal reactor operation, the chimney is radially constricted such that the chimney obstructs vertical removal of the fuel assemblies. In a second configuration suitable for refueling or maintenance of the fuel core, the parts of the chimney which obstruct access to the fuel assemblies are moved radially outward to positions whereat access to the fuel assemblies is not obstructed.
Oosterkamp; Willem Jan (Oosterbeek, NL), Marquino; Wayne (San Jose, CA)
General Electric Company (San Jose, CA)
08/ 347,621
December 1, 1994
The Government of the United States of America has rights in this invention in accordance with Contract No. DE-AC03-90SF18494 awarded by the Department of Energy.