Nuclear power plant, oxygen injection device, dissolved oxygen concentration meter and corrosion suppressing method of nuclear power plant

摘要

To make suppression of stress corrosion cracking (SCC) of stainless steel, nickel-based alloy, etc. constituting a structure and equipment inside a nuclear reactor pressure vessel and suppression of flow accelerated corrosion (FAC) of carbon steel constituting piping, equipment, etc. of a reactor water clean-up system (CUW) compatible with each other in a nuclear power plant into which hydrogen and a catalyst such as a precious metal are injected.SOLUTION: The nuclear power plant is provided that comprises: a nuclear reactor pressure vessel having a reactor core; water supply system piping supplying water to the nuclear reactor pressure vessel; and nuclear reactor clarification system piping connected to the nuclear reactor pressure vessel. A regenerative heat exchanger, a non-regenerative heat exchanger, and nuclear reactor clarification system clarification equipment are installed in the nuclear reactor clarification system piping. The nuclear reactor clarification system piping is connected in such a way as to merge with the water supply system piping and to inject hydrogen and a catalyst into reactor water. An oxygen injection device is installed in an upstream part of piping including carbon steel of the nuclear reactor clarification system piping. A dissolved oxygen concentration meter is installed in a region on the upstream side of a place where the nuclear reactor clarification system piping merges with the water supply system piping, and on the downstream side of the regenerative heat exchanger.SELECTED DRAWING: Figure 1