Abstract: In addition to the metal-fiber filter and molecular sieve of a depressurization system for the containment vessel of a nuclear reactor, within an auxiliary equipment building adjacent the structure surrounding the containment vessel, at least one metal-fiber filter and at least one molecular sieve form filter elements of a system for evacuating the space between the structure and the containment.

Abstract: A device for relieving the pressure in a containment of a nuclear power station. The device includes a filter unit for filtering compressed air from the containment and discharging the air to the atmosphere. Radioactive substances entrained in the compressed air are removed. The filter unit includes an aerosol-filter subunit located within the containment, and a molecular-sieve subunit for iodine filtering located outside the containment in an auxiliary equipment building. Ducts and fittings connect the subunits of the filter unit. At least one duct extends through the containment wall and can be opened and closed by fittings which can be actuated in the event of a failure.