Patent ID: 7680237

Claim:
A containment vessel of a nuclear power plant, comprising: an interior space; a condensing chamber disposed in said interior space, said condensing chamber being filled to a filling level with a cooling liquid; a pressure chamber disposed in said interior space, said pressure chamber having a top region; a condenser disposed in said interior space; a condensing pipe leading into said condensing chamber for enabling overflow of vapor into said condensing chamber from outside said condensing chamber; and a drain pipe for noncondensible gases, said drain pipe disposed in said interior space and fluidically connecting said top region of said pressure chamber to said condensing chamber, said drain pipe defining a direct connection to said condensing chamber, and said drain pipe not connected to said condenser, said drain pipe having an upper end disposed at a level above said condenser and a bottom end immersed into said cooling liquid; said condenser and said upper end of said drain pipe being disposed in said pressure chamber, and said upper end of said drain pipe being disposed to permit the noncondensible gases to be led off from atmosphere surrounding said condenser and thermally interacting with said condenser.