Process and device for contamination-free installation or removal of objects through an opening in the wall of a room contaminated by radio-activity

The process uses a double lid system and bellows which can be closed on both sides for installation or removal of objects. In change processes in hot cells, for example, no contaminated substances are released and no free contaminated parts of surfaces are caused after the change process. The end of the bellows is connected with the lid at the opening of the first double lid system and is pulled inside the bellows together with the objects fixed to the lid at the opening. A second double lid system accommodated inside the bellows is then taken to the opening, connected to the bellows and to the opening, and is then separated. By this means the beam is separated from the opening again, where the opening and the bellows remain closed by a double lid part of the second double lid system. (RW)