GAS TREATMENT FACILITY OF NUCLEAR POWER PLANT

PROBLEM TO BE SOLVED: To provide a gas treatment facility of a nuclear power plant capable of improving a gas treatment efficiency inside a reactor containment vessel even when a total AC power source is lost.SOLUTION: When a total AC power source is lost in a nuclear reactor cooling water loss accident, hydrogen, radionuclide, and water vapor are discharged into a reactor containment vessel from the broken part of a piping which is connected to a reactor pressure vessel. A catalytic hydro-treating device 2 installs a catalyst layer 22 and a heat transfer tube 5 of a heat-exchanger 4 in a casing 3. A high-temperature water vapor including hydrogen and radionuclide is supplied into the heat transfer tube 5 so as to heat a gas to be described later, which is supplied into the casing 3. The water vapor is condensed in the heat transfer tube 5 and generates a mist. The mist is removed together with the radionuclide by a mist separator 6. The gas including hydrogen which is supplied into the casing 3 from the mist separator 6 is heated by the water vapor, and guided into the catalyst layer 22. Hydrogen is coupled to oxygen in the catalytic layer 22 and becomes water vapor.