Abstract: The device comprises at least one assembly insertable in the enclosure through a hole situated in the vicinity of the tubular plate. Said assembly comprises a suction pipe having a curved part insertable in the casing through the hole and of a shape such that it terminates in the immediate vicinity of the plate, between the enclosure and the stack of tubes and a conduit placed inside the pipe, for connection to a cleaning liquid supply, ending in a nozzle for projecting water in a transverse direction to the pipe, along a grazing path with respect to the tubular plate and in the circumferential direction of the enclosure.

Abstract: Telemanipulator for operation in a waterbox of a steam generator for attachment underneath the tubeplate of the latter. The device has expandable grippers mounted on arms carried by a bearer unit, for engaging and locking as required in the orifices in the tubeplate, with means enabling independent movement of the apparatus underneath the tubeplate while remaining always suspended by at least two grippers. The bearer unit has four independent arms each equipped with two expandable grippers, and on the portion of it opposite from the tubeplate it supports an arm having a number of members hinged together, the end member of the arm being equipped with tool attachment means, the whole of the arm being in turn revolvable about the axis of the unit perpendicular to the tubeplate, with remote-controlled means for adjusting and maintaining the angular position of the arm with respect to the bearer unit and the angular position of each of the members of the arm relative to one another.

Abstract: A tool carrier unit, intended to be moved over a tube plate, comprises two perpendicular arms equipped with devices for engaging in the holes of the plate, and for moving the unit, step by step, by relative movement of the arms, across the plate. The unit comprises a supporting element in the form of an angle bracket defining a vee arranged with its apex perpendicular to the plate. The arms are arranged external to the vee, and at the inside of the vee, unaffected by the movement of the arms, guides are provided for supporting a tool.

Abstract: Apparatus for use in screwing a cover onto an annular bearing seat provided at the circumference of a circular orifice, the cover being provided with a circle of screws to be engaged in threaded bores in the bearing seat, comprises a screwing device comprising an arm pivotable about the axis of a pivot mounted on a support plate to be fixed to the cover, the arm extending perpendicular to the axis of the pivot which extends perpendicular to the plane of the bearing seat, a screwing head mounted on the end of the arm and carrying a screw key for engaging and rotating the screws, and which is movable axially between an operative position engaging a screw and an inoperative position clear of the screw and permitting the arm to rotate to bring the screw key into alignment with another screw, and drive means for rotating the arm, for rotating the screw key and for moving the screw key axially, a remote control console for controlling the drive means, and a television circuit for remote observation of operation of