NUCLEAR POWER PLANT, OXYGEN INJECTION DEVICE, DISSOLVED OXYGEN CONCENTRATION METER AND CORROSION SUPPRESSION METHOD FOR NUCLEAR POWER PLANT

摘要

This nuclear power plant is provided with: a nuclear reactor pressure vessel having a reactor core; water supply system pipes for supplying water to the nuclear reactor pressure vessel; and nuclear reactor purification system pipes connected to the nuclear reactor pressure vessel. A regenerative heat exchanger, a non-regenerative heat exchanger, and nuclear reactor purification system purification equipment are installed in the nuclear reactor purification system pipes. The nuclear reactor purification system pipes are connected to and thereby merge with the water supply system pipes and inject hydrogen and a catalyst into reactor water. An oxygen injection device is installed on an upstream-side portion of the nuclear reactor purification system pipes, said portion including carbon steel. A dissolved oxygen concentration meter is installed in the nuclear reactor purification system pipes downstream of the regenerative heat exchanger and upstream of a section merging with the water supply system pipes. Accordingly, in the nuclear power plant, into which hydrogen and a catalyst such as a precious metal are injected, it is possible to achieve both the suppression of stress corrosion cracking (SCC) of the stainless steel, nickel-based alloy, etc. constituting the structures and apparatuses inside the nuclear reactor pressure vessel, and the suppression of flow acceleration corrosion (FAC) of the carbon steel constituting the pipes, apparatuses, etc. of a nuclear reactor cooling material purification system (CUW).