Method and device for shutting off the primary circuit of nuclear reactors

摘要

An entirely remotely controlled method and device for shutting off the primary circuit of nuclear reactors. The shutter comprises a deployable basket 910 for preventing falls into the primary piping, whose external L-shaped profile 911 receives the inflatable ring seal of a sealing diaphragm 912, supplemented by the assembly of at least three pressure-resistant plug members 918 which are fastened by jacks 919 to a flange 907 welded onto the SG bowl at the piping connection. Its installation is ensured by a remotely controlled manipulator 921 attached to a support member 908 welded onto the SG partition plate. These devices are intended to reduce the personnel irradiation hazards during servicing operations in the water box of the steam generators. <IMAGE>