Hitachi-ge Nuclear Energy, Ltd.

Youichi Wada

Kazushige Ishida

Makoto Nagase

Hideyuki Hosokawa

Motohiro Aizawa

Naoshi Usui

Motomasa Fuse

Masahiko Tachibana

Mayu Sasaki

Nobuyuki Oota

Ryosuke Shimizu

The present disclosure provides a method for relieving a corrosive environment of a boiling water reactor, the method including a step of injecting hydrogen and a noble metal compound into water to be replenished into the reactor pressure vessel during a period of a generating operation of a boiling water nuclear power plant including the reactor pressure vessel. In the method, the hydrogen is injected into water to be supplied into the reactor pressure vessel, and the noble metal compound is injected into water in a line of the boiling water nuclear power plant in which a concentration of oxygen or hydrogen peroxide is stoichiometrically higher than the concentration of hydrogen at which hydrogen undergoes a chemical reaction to turn to water. Thus, when a noble metal is injected into a boiling water reactor, the noble metal can be restrained from adhering onto a pipe for an injection and other pipes, and thereby can increase the amount of the noble metal to be injected into a cooling water in a reactor pressure vessel.

Method for relieving corrosive environment of boiling water reactor, nuclear power plant, and method for injecting noble metal which is carried out in nuclear power plant

It is an object of the present invention to efficiently suppress radionuclide deposition on a reactor component of nuclear power plant. Radionuclide deposition on the surface of a metallic reactor component of nuclear power plant is suppressed by forming a ferrite film on the component, wherein the film is formed, after decontamination for removing radionuclides contaminants from the component surface is completed and before the plant is started up, by contacting a treatment solution which mixes a first agent containing the iron (II) ions, a second agent for oxidizing the iron (II) ions into the iron (III) ions and a third agent for adjusting pH level of a solution to 5.5 to 9.0 in this order with the reactor component surface.

Suppression method of radionuclide deposition on reactor component of nuclear power plant and ferrite film formation apparatus

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Tokyo, Japan

Youichi Wada