Nuclear Energy Services, Inc.

Consolidation Edison Company of New York, Inc.

Louis J Zezza

William R Masetti

Frank Fiorelli

Daniel M Gately

Method and apparatus for maintaining a water level which immerses heat exchanger tubes, containing radioactive emitting material, within an inner shell of a steam generator while permitting space between the inner shell and a coaxial outer shell to be free of water during operations performed by workmen in such space after the apparatus is installed thereby reducing exposure of the workmen to harmful radiation. Seal support segments are installed around the inner shell at the lower end of the space and in engagement with the inner and outer shells. A pair of inflatable tubes are placed end-to-end on the support segments so as to encircle the inner shell. Seal retention segments which, together, form a ring around the inner shell are placed on the inflatable tubes and the latter tubes are inflated to form a water tight seal between the shells. The water level in the shells can be lowered to a level below the inflatable tubes during installation of the components and the water level within the inner shell can be raised so as to immerse the radiation emitting tubes after inflation of the inflatable tubes, but preferably, the radiation emitting tubes are maintained immersed in water until the components are installed and the inflation of the inflatable tubes, and water in the space is then pumped out.

Method and apparatus for fluid sealing of steam generator

In a nozzle dam assembly wherein a circular dam faces into a nozzle adjacent its opening and a support frame abuts the backside of the dam and is removably affixed across a ring encircling the opening, apparatus for selectively locating the dam at its optimum sealing position within the nozzle notwithstanding the particular longitudinal profile of the nozzle or eccentricity of the ring-relative to the nozzle opening comprising apparatus for adjusting the dam relative to the frame along the nozzle axis and also vertically and horizontally perpendicular to the nozzle axis.

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Brookfield, CT, United States of America

Louis J Zezza