Abstract: A method for disposing of a radioactively contaminated steam generator with a multiplicity of U-shaped heating tubes fixed in a tube plate, includes cutting off the heating tubes above the tube plate, cutting open the dome of the steam generator and gripping the heating tubes one after the other at the U-bend with force-locking measures. Once gripped, each heating tube is drawn through crushing rollers to achieve an initial reduction in size and to reduce a bend radius of the tube and is then passed into a press where it is pressed flat.

Abstract: An installation for decontaminating a radioactively contaminated surface with a dry mechanical abrasive includes an extractor for suction extraction of an extraction gas together with an abrasive/dust mixture produced during blasting. A separator separates the abrasive/dust mixture aspirated by the extractor into a dust fraction and a re-usable abrasive fraction. A storage bin is connected between the extractor and the separator. The storage bin includes a filter device having a filter for filtering the extraction gas flowing through the storage bin to the extractor, and a blowoff line to be connected to the filter device for blowing off the filter.

Abstract: An apparatus decontaminates a radioactively contaminated surface region of a pipe, connector or vessel being open at one end, with a dry mechanical blasting medium. The apparatus includes a processing bell to be mounted on the open end of the pipe, connector or vessel. A flexible dustproof duct is connected to the processing bell. A retaining device protrudes into the duct and is movable from outside in the interior of the pipe, connector or vessel. A blasting head is disposed on the retaining device. A blasting system is connected to the blasting head and has a continuous circulation of the blasting medium.

Abstract: An assembly includes a structure. A shielding apparatus is disposed inside the structure and radioactive plant components having sides and a bottom are surrounded by the shielding apparatus. The radioactive plant components include relatively highly radioactive components and relatively weakly radioactive or non-radioactive components. A water-tight vessel embedded in the structure has an interior and an outside and exclusively surrounds the radioactive plant components at the sides and at the bottom with the relatively highly radioactive components disposed in the interior and the relatively weakly radioactive or non-radioactive components disposed at the outside. The water-tight vessel is sufficiently large to hold water serving as a shielding device and to hold crushed contaminate pieces of the radioactive plant components during subsequent dismantling of the plant components.

Abstract: A method and an apparatus for the wet dismantling of radioactively contaminated or activated components of nuclear reactor plants such as pressure vessels, includes optionally enclosing the component with a jacket or enclosure tube at the end of the service life of the component, the jacket or tube may be cast or molded, providing a sheathing between the component and the jacket, or between the component and a concrete shield, having a thickness sufficient to support at least part of the component after dismantling the component into individual pieces, or joining the jacket to the pressure vessel or to a bottom plate, flooding the component with water for radiation shielding, at least partly dismantling the component into individual pieces through a material-removing tooling or erosion method, and removing the individual pieces.

Abstract: Method for electropolishing the inner surface of an U-shaped heat exchanger tube with an electrode connected to a negative pole of a d-c voltage source, the electrode being slidable into the heat exchanger tube and withdrawable out of the tube by a pulling member, and with a pump connected to an electrolyte tank for feeding electrolyte into the heat exchanger tube, which comprises inserting into two chambers, respectively, formed in a bottom hemispherical shell of a heat exchanger, respective manipulators formed with jibs for positioning tube probes by remote control into end openings of U-shaped heat exchanger tubes disposed in the heat exchanger and opening into the chambers; pressing by the manipulators respective adapters, which are connected to hose connectors and are carried at respective free ends of the manipulator jibs, to the end openings of the heat exchanger tubes through the intermediary of respective seals so as to align in each of the chambers the end opening of one of the U-shaped heat exchang

Abstract: A device for electropolishing the inner surface of a hollow cylindrical body with at least one sponge electrode movable along the inner surface, as well as with devices for guiding the sponge electrode and for supplying the sponge electrode with electrolyte includes a chassis braced against the inner surface of the hollow cylindrical body and being movable along the axis of curvature of the hollow cylindrical body, the sponge electrode being carried by the chassis, being pressable against the inner surface of the hollow cylindrical body and being rotatable about the axis of curvature of the hollow cylindrical body.

Abstract: Apparatus for performing a method of decontaminating metallic components of a nuclear engineering installation by electropolishing with electrodes and an electrolyte liquid travelling in a circulatory loop during the decontamination, including a filter having a pore width of at most 1.5 .mu.m, the electrolyte liquid being an aqueous solution having an electrolyte concentration of at most 20 percent by weight.