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Bottom head to shell junction assembly for a boiling water nuclear reactor

United States Patent

5,721,758
February 24, 1998
View the Complete Patent at the US Patent & Trademark Office
A bottom head to shell junction assembly which, in one embodiment, includes an annular forging having an integrally formed pump deck and shroud support is described. In the one embodiment, the annular forging also includes a top, cylindrical shaped end configured to be welded to one end of the pressure vessel cylindrical shell and a bottom, conical shaped end configured to be welded to the disk shaped bottom head. Reactor internal pump nozzles also are integrally formed in the annular forging. The nozzles do not include any internal or external projections. Stubs are formed in each nozzle opening to facilitate welding a pump housing to the forging. Also, an upper portion of each nozzle opening is configured to receive a portion of a diffuser coupled to a pump shaft which extends through the nozzle opening. Diffuser openings are formed in the integral pump deck to provide additional support for the pump impellers. The diffuser opening is sized so that a pump impeller can extend at least partially therethrough. The pump impeller is connected to the pump shaft which extends through the nozzle opening.
Fife; Alex Blair (San Jose, CA), Ballas; Gary J. (San Jose, CA)
General Electric Company (Schenectady, NY)
08/ 608,635
February 29, 1996
GOVERNMENT RIGHTS STATEMENT The Government of the United States of America and the Advanced Reactor Corporation have rights in this invention pursuant to Contract No. DE-FC02-92NE342657 awarded by the U.S. Department of Energy.