Method of operating nuclear power plant, nuclear power plant, and method of controlling water chemistry of nuclear power plant

A method of operating a nuclear power plant for suppressing occurrence of stress corrosion cracking in metallic component materials in contact with reactor cooling water of a nuclear power plant, wherein

• electrochemical corrosion potentials of said metallic component materials are decreased by injecting zirconium hydroxide and hydrogen into said reactor cooling water, and an injecting amount of said hydrogen, an injecting amount of said zirconium hydroxide and injecting timing of said zirconium hydroxide are controlled so that said electrochemical corrosion potentials may be maintained below a target value.

A method of controlling water chemistry of a nuclear power plant, wherein in order to suppress occurrence of stress corrosion cracking in metallic component materials in contact with reactor cooling water of a nuclear power plant, zirconium hydroxide is injected into said reactor cooling water before injecting hydrogen into said reactor cooling water.

A method of operating a nuclear power plant for suppressing occurrence of stress corrosion cracking in metallic component materials in contact with reactor cooling water of a nuclear power plant, wherein

• zirconium hydroxide and hydrogen are injected into said reactor cooling water.

A method of operating a nuclear power plant for suppressing occurrence of stress corrosion cracking in metallic component materials in contact with reactor cooling water of a nuclear power plant, wherein

• zirconium hydroxide and hydrogen are injected into said reactor cooling water, and an injecting amount of said hydrogen, an injecting amount of said zirconium hydroxide and injecting timing of said zirconium hydroxide are controlled so that said electrochemical corrosion potentials may be maintained below a target value.