Device for stabilizing the tubes of the bundle of a steam generator having anti-vibration bars

Device for stabilizing tubes of a bundle of a steam generator, comprising anti-vibration bars between curved parts of said tubes bent in a form of a U, said tubes having two straight legs set at ends thereof in a tube plate, said curved parts of said tubes having radii of curvature different from one another and being located adjacent to one another to form a substantially hemispherical dome, and being separated by anti-vibration bars which are each arranged in substantially radial directions between said curved parts of said tubes in a mutually adjacent position, and bows in the form of a portion of a ring surrounding an outer surface of said dome and arranged in planes all passing through a same diameter of said dome and connected by hoops perpendicular to said bows, said device further comprising a plurality of fastening brackets fixed to each said bow perpendicularly relative to said bow and relative to said anti-vibration bars which are each fastened, at an outer end thereof, to one of a bracket and a hoop my mechanical screwing means.