[en] The invention has been aimed at a device for the radiation shield in radiation protection wall penetrations. Within a misaligned tube a protective barrier is arranged through which at least one channel opening is guided on the principle of gap area lapping. The invention renders possible to use much less absorber material for the protective barrier

[en] The invention aims at the development of bushing means for passing electric wires through containment shells in such a way that air-tightness and its continuous monitoring during operation is ensured

[en] The invention has been directed at a hermetic penetration of feeders and instrumentation leads through the containment of nuclear power plants. This penetration is sealed against media and radiation also at high temperature and radiation exposures. It ensures an economical mounting and a non-destructive dismounting as well as a minimum expense of failed component exchange and has a longevity. The penetration consists of a fixed flanged pipe with a radiation protective device which has some cylinder plates with bores. The bores take up insulating tubes for guiding the bare and axially parallel staggered feeders and instrumentation leads