Framatome Gmbh

Andre Guglielmo

Paul Jacquier

Daniel Grypczynski

The centering device comprises a centering plate (23) mounted on a carrier member (21) for rotation about an axis parallel to the axis of the steam generator tubes and carrying two radial expansion fastening grippers (39), and a drive (22, 27, 28) for orientation of the plate (23) about its axis. The fastening grippers (39) are disposed on the plate in relative positions corresponding to openings provided in the tube plate (18) for the passage of the tubes (13).

Device for centering a servicing tool in a steam generator tube

The body (4) of the plug (3) is rebored in the direction of its end wall (6) and the clamp block (7) is drilled by an electric machining process, over a substantial part of the length of the plug. The wall of the plug body (4) is relieved of stress with the aid of a welding torch introduced into the bore made by electric machining, and a gripping tool is introduced into the bore in order to extract from the tube the plug body (4) which has been relieved of stress.

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Villeurbanne, France

Andre Guglielmo