Abstract: The device comprises a pole fastened to a handling and lifting apparatus arranged above the pool in which the fuel assembly is placed under water. The pole has at least one lower end part (32), the diameter of which is less than the inside diameter of the blocking sleeve (25). This part (32) is pierced with a central bore (40) and with at least two radial orifices (56), in each of which is located a retention claw (57). A rod (41) sliding in the axial bore (40) makes it possible to control the extraction of the claws. The vertical movement of the pole makes it possible to extract the blocking sleeve (25).

Abstract: The device comprises a pole (31) fastened to a handling and lifting means arranged above the pool in which the fuel assembly is placed underwater. The pole has at least one lower end part (32) or spindle, the diameter of which is less than the inside diameter of the blocking sleeve (25). This part (32) has a spring means (48) for retaining the blocking sleeve in the position engaged on the spindle, and a transversely arranged surface (38) for bearing on part of the sleeve (25), and a means (40) for the vertical movement of the pole (31).

Abstract: The device comprises a pipe for aspiration and delivery of water from a well, a column suspended from a traveling crane located above the well and an aspiration head fixed at the end of the column opposite to the crane. The aspiration head is composed of two hollow walls assembled to one another, between which there is a filtration wall separating the internal volume of the head into a first part having an aspiration opening and a second part connected via a conduit to the aspiration pipe.

Abstract: The device comprises a work tool (35) fixed on a crossed displacement carriage device (26). The tool comprises a sliding block (42) mounted so as to move in a guide ( 39). A bearing stop (45) is fixed to the end of the slide of the guide (39). A folding hook (43) is fixed to the end of the sliding block (42) in order to engage with the fin (12), the stop (45) bearing against the small plate (10) of the spacer grip. The sliding block (42) may be displaced by a ball remote control.

Abstract: The device comprises a vertical pole (11) having a manipulating handle (14) at its upper end and a gripper (22) fastened to one end of a gripper support (20) mounted pivotally about a horizontal axis (21) at the end of the pole (11). Springs (25, 29) make it possible to return the gripper into a grasping position distant from the vertical axis ZZ' of the pole (11). A mechanism (24) for controlling the gripper in order to open and close it is carried by the gripper holder (20). This mechanism is connected to a remote-actuation mechanism by a flexible transmission element (37).

Abstract: The device comprises a rod (28) on which is mounted a means (30, 32, 33) for support and displacement which is movable in an axial direction of the rod (28) and in two directions perpendicular to this axial direction. The support (33) of the means for displacement carries a device for pushing axially on a longitudinal end of the pencil, which may be activated by a control means (35), one end of which is located in a control station (25) disposed above a fuel assembly storage pool. Means for measuring the axial pushing force on the pencil and the length of axial displacement of the pencil under the effect of the pushing are disposed in the control station (25). A video camera (34), carried by the support (33), makes it possible to provide an image of a zone in the vicinity of the end of the pencil.

Abstract: The device comprises a rod (20) on which is mounted a means (22, 24, 25) for the support and displacement of a work tool which is movable in an axial direction of the rod (20) and in two directions perpendicular to this axial direction. The tool comprises tongs consisting of two arms which are articulated together about a spindle fixed on the means (22, 24, 25) for support and displacement in a direction parallel to the axis of the rod (20). The tongs comprise end jaws which are capable of gripping a fuel rod. The gripping of the tongs is controlled remotely and the positioning of these tongs on a fuel rod to be removed is checked by means of a video camera (26).

Abstract: For sampling a section of a tube in a nuclear fuel assembly comprising a skeleton formed by two end-pieces joined by tubes fixed to the end-pieces an opening for the extraction of the section through the upper end-piece is cut out with a milling cutter. Through the inside and by means of a cutting tool, the spacer tube is cut off at a level beneath the junction with the upper end-piece by means of a rotary tool introduced through the upper end-piece and the latter is extracted through the opening.