Abstract: At least two pivoting jets (55a, 55b, 55c) of cleaning liquid, each directed between two successive lines of tubes substantially perpendicular to the rows of tubes, are sent, in succession, from locations situated inside the bundle of the steam generator, into a space between two successive rows of tubes so as to sweep the tube plate between a central part vertically in line with the space between the two rows of tubes and two outer parts situated at the periphery of the bundle and along the length of the space between the rows of tubes. The flow rate of cleaning liquid is at least equal to 20 1/min, per jet. The invention applies in particular to the cleaning of the tube plate of a steam generator of a pressurized-water nuclear reactor.

Abstract: At least two pivoting jets (55a, 55b, 55c) of cleaning liquid, each directed between two successive lines of tubes substantially perpendicular to the rows of tubes, are sent, in succession, from locations situated inside the bundle of the steam generator, into a space between two successive rows of tubes so as to sweep the tube plate between a central part vertically in line with the space between the two rows of tubes and two outer parts situated at the periphery of the bundle and along the length of the space between the rows of tubes. The flow rate of cleaning liquid is at least equal to 20 l/min, per jet. The invention applies in particular to the cleaning of the tube plate of a steam generator of a pressurized-water nuclear reactor.

Abstract: The method comprises providing an annular cavity in an internal part of a tapped bore of the guide cone, screwing the tapped bore of the guide cone onto the threaded end of the thermal sleeve and expanding at least part of the end of the thermal sleeve radially into the cavity of the guide cone from inside the thermal sleeve and the guide cone.

Abstract: The device includes a first tubular support (11) carrying on its outside surface means for fixing to a handling tool, a second tubular support (18) mounted coaxially inside the first support (11) for rotation about its axis. A flexible strip (55) carrying a monitoring probe at one of its ends is engaged in a slideway support carried by the second support (18) and including an end part (65) mounted to pivot about an axis which is perpendicular to the axis (25) of the second support (18). The strip (55) is moved translationally along the axial direction (25) by a conveyor bolt (53). The inside surface of the tubular piece (3) is monitored by moving the probe fixed to the end of the flexible strip (55) rotationally about the axis (25) and in axial translation, inside the annular space (8) between the sleeve (5) and the tubular piece (3).

Abstract: The tubular wall (1) of the irradiated component is machined on its upper annular surface, with chips (44) being formed by the use of a metal working machine (30) bearing on this upper surface and moving in rotation about the axis (6) of the wall (1) of the component. The chips (44) formed by the metal working machine (30), e.g., a milling head, which moves in the vertical direction and downwards, are collected and cleared away continuously during the progress of the machining in the axial direction (6) of the wall (1) of the component. The device is fastened to the upper part of the tubular casing (1), arms (7a, 7b) equipped with jacks allowing the device (4) to be flanged to the wall (1) of the component, and bearing devices (12) comprising arms (13) being mounted pivotably about a horizontal axis between a low bearing position and a high withdrawal position (13'). The bearing arms (13) change from their low position to their high position at the moment when the machining tool (31) passes.