Hitachi-ge Nuclear Energy, Ltd.

Shintaro Yanagisawa

Hideyuki Hosokawa

Nobuyuki Ota

Satoshi Oouchi

Ryo Hamada

Takashi Oohira

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.

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Hitachi, Japan

Shintaro Yanagisawa