Hitachi, Ltd.

Akira Ichimura

Kenichi Ito

Katsumi Ohsumi

Yamato Asakura

Noriyuki Ohnaka

Motohiro Aizawa

Naohito Uetake

Kouichi Yamane

A reactor water clean-up system is provided with a first filter demineralizer having a filter resin containing an alkali substance and a second filter demineralizer with a filter resin not containing an alkali substance. The reactor water is supplied to the first filter demineralizer during the term from the starting operation of the preoperating test of the nuclear reactor and of each fuel cycle to 2000 EFPH. The alkali substance contained in the filter resin is guided into the nuclear reactor to change the pH of the reactor water in the nuclear reactor to the weak alkali side. The Cr quantity which is taken in the oxide film of the fuel cladding tube surface is reduced. After 2000 EFPH from the starting operation, the supply of the reactor water to the first filter demineralizer is stopped, and then, the reactor water is supplied to the second filter demineralizer.

Boiling water reactor and its operating method

Growing community of inventors

Ibaraki-machi, Japan

Akira Ichimura