Abstract: The invention relates to a radiation-shielding closure arrangement wherein closure body closes off an opening in a wall between two mutually adjacent large-area cells of a nuclear facility. When the closure body is in the closed position, the cell adjacent the cell wherein radiation is present is shielded against the radiation. If one of the cells contains a cell crane and is at the same time a prohibited area because of radiation present therein, the adjacent cell is configured to be an access cell so that maintenance work on the cell crane can be conducted there. The opening in the partition wall between the two cells must be closed during the time that the maintenance work on the crane is performed. For this reason the closure body is mounted on a horizontal rail track for movement therealong. The outer profile of the closure body fits snugly in the inner profile of the wall opening or overlaps the wall opening completely.

Abstract: The invention is directed to a coupling arrangement for pipe conduits thrh which a medium containing radioactive or toxic substances is conveyed. The coupling arrangement includes a first coupling unit mounted on the end of a first one of the pipe conduits. A conduit engaging assembly is mounted at the end of the second one of the pipe conduits and includes an inner conduit segment tightly connected to and aligned with the second pipe conduit. A tubular member is arranged in surrounding relationship to the inner conduit segment so as to be coaxial therewith. The tubular member has a forward free end facing toward the first coupling unit and a second coupling unit is mounted on the forward free end of the tubular member and is joinable to the first coupling unit.