Nuclear power plant

The pressure vessel of the water-cooled reactor is placed in another vessel, e.g. in a turbine shop. The two vessels are separated by a water sump in which a vent line from the pressure vessel is submerged. A safety system provides for an escape of the reactor coolant in two phases in case of a failure in the coolant loop. Most of the steam is condensed in the sump, and the high pressure is thus suppressed. The excess pressure which is still forming in the turbine shop is let out through a one-way relief valve at the end of the shop which is opposite the pressure vessel. The low-volume contaminated phase is thus retained in the sump or in the shop. In addition, a choking, baffling or guiding element with a second vent line is provided for the medium flow from the shop to the pressure relief valve. This second vent line leads to vent holes in the lower part of the shop. (DG)