MODELLING OF EX-VESSEL PHENOMENA

The reactor system is enclosed in a leak-tight containment to protect the public from release of radioactive products; this implies the prevention of leakages from the containment atmosphere into the environment.

Containments of commercial reactors have a volume from several thousand to a maximum of 80000 m3; some small containments are equipped with a pressure-suppression — system (ice boxes or a water pool). Containments are somewhat compartmentalized.