Abstract: A thick non-magnetic metal plating (18) constituting a sleeve on the surface of the tube (12) is produced by electroplating a region to be repaired. The plating has a thickness greater than 0.5 mm, and preferably close to 1 mm, and by itself can ensure the mechanical integrity of the tube in service. Preferably, the thick non-magnetic plating is made of a nickel-boron alloy with less than 5% by weight of boron.

Abstract: During shutdown of the nuclear reactor, the closure head of the vessel having been dismounted and the vessel (3) and the pool of the reactor both being filled with water, an inner zone of the penetration tube (6) for penetrating the bottom head of the vessel (3) is isolated between two seals (39,42), from the upper level of the pool. An electrolyte is caused to flow in the isolated zone inside the penetration tube (6) and a current is passed through the electrolyte in order to deposit a metallic electroplating layer onto the inner surface of the penetration tube (6) in the isolated zone. The metallic layer is preferably a layer of nickel of a thickness of approximately 0.1 mm.

Abstract: An apparatus for nickel electro-plating parts from nickel plating baths that use nickel sulfamate as a source of nickel has a tank containing the nickel plating bath and in which an anode and a cathode are immersed. A semi-permeable wall of sintered or polymer material separates a cathode compartment from an anode compartment.

Abstract: Repair of a steam generator tube is performed by crimping a tubular casing (18) in a zone (14) of the tube (12) in which a metallic coating (20) has been produced on the inner surface of the tube, for example by electrolytic deposition. The tubular casing (18) may consist of an attached sleeve (18), crimped in the tube (12). In the case of a tube crimped over only part of the length of the hole passing through the tube plate, the tubular casing may consist of the tube itself on which additional crimping is performed inside the hole which passes through the tube plate.