Abstract: This hooking device is fastened to the choke plug (8) for guide tube (2). comprises of catches (54) regularly arrayed along the periphery of the flange (9) of the choke plug (8) and hooks to the upper spacer (4S) of the guide tube (2). It is kept in the engaged position by a spring system (56-58), 63-65) and can disengage by means of a tool means comprising a roller (77) acting on each catch (54) and a rim (68) resting on a muff (56) acting as a rest also for the spring (57).

Abstract: The shroud is designed to prevent components of a damaged nuclear fuel element from dropping into a pool. The shroud consists of a body 1 surrounding the nuclear element over the major part of its height, and a base 2 equipped with a device to attach it to the feed 13 of the fuel element. The attaching device is actuated by the rotation of a control shaft 17 capable of being inserted in the center of a hub 9 equipped with two arms 10, which carry at their ends gripper fingers 11, maintained in their position of engagement in the feet 13 by springs 20.

Abstract: The safety device consists of doubling a first reel (4) equipped with an operating cable (11) from a carriage (24) for nuclear fuel elements is suspended, by a second reel (5) equipped with an emergency cable (12) connected with the carriage (24) and following the displacement of the carriage in a synchronous manner with the aid of a set of cog-wheels (6 and 7) joined respectively with the reels (4 and 5) by means of reducing gears (2 and 3) and connected with each other by a notched belt (8).To attenuate the impact in case of a rupture of the operating cable (11) and the loading of the emergency cable (12), the carriage (24) is equipped with an attenuating system (22) and an elastic connecting system (20).