Hitachi-ge Nuclear Energy, Ltd.

Masao Endo

Makoto Nagase

Kazushige Ishida

Yoichi Wada

Motohiro Aizawa

Naoshi Usui

Motomasa Fuse

Masahiko Tachibana

The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.

Method of stress corrosion cracking mitigation for nuclear power plant structural materials

Method of stress corrosion cracking mitigating for nuclear power plant structural materials

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Kitaibaraki, Japan

Masao Endo