The safe enclosure of the radioactive inventory of a nuclear plant is structured according to the multiple barrier principle, i.e. Radioactive substances within the meaning of the Atomic Ener... must pass these multiple different barriers connected in series before they are released. Barriers of a See 'reactor'.:
- Retention of the Nuclides generated by fission or subsequent radioactive deca... in the In accordance with the definition of the German Atomic Energ... itself,
- Enclosure of the In accordance with the definition of the German Atomic Energ... in Tightly bound (usually metallic) casing directly surrounding... tubes,
- Enclosure of the See 'nuclear fuel'. elements in the Thick-walled cylindrical steel vessel enclosing the reactor ... and primary Any substance used to remove the heat in a nuclear reactor. ... system,
- Gas-tight Gastight case around a reactor and the circuit and auxiliary... around the Thick-walled cylindrical steel vessel enclosing the reactor ....