Hitachi-Ge Nuclear Energy, Ltd.

Takashi Oohira

Hideyuki Hosokawa

Nobuyuki Ota

Ryo Hamada

Satoshi Oouchi

Motohiro Aizawa

Masahiko Kazama

Naobumi Tsubokawa

Hiroo Yoshikawa

Shintaro Yanagisawa

Provided are a chemical decontamination method and a chemical decontamination apparatus capable of preventing deterioration of a metal ion exchange resin and performing decontamination at a low cost in a short time. The chemical decontamination method of the invention includes: a reduction decontamination step of supplying a reduction decontamination solution to a decontamination target portion and performing reduction decontamination on a surface of a member constituting the decontamination target portion; a hydrogen peroxide decomposition step of decomposing hydrogen peroxide contained in the reduction decontamination solution after the reduction decontamination step; and a metal ion removing step of removing a metal ion contained in the reduction decontamination solution after the hydrogen peroxide decomposition step.

Chemical decontamination method and chemical decontamination apparatus

A chemical decontamination method capable of improving the decontamination efficiency of chemical decontamination of a steam dryer in the RPV is provided. In particular, the decontamination method includes feeding a chemical decontamination aqueous solution into a reactor pressure vessel in which a steam dryer is arranged, and after chemical decontamination of the steam dryer, the water level of the chemical decontamination aqueous solution existing in the reactor pressure vessel is lowered to a first water level below the lower end of the steam dryer.

Chemical decontamination method

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Hitachi, Japan

Takashi Oohira