• Kyodo

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Too much heat during welding, poor water quality and inferior materials are being examined as possible causes of a radioactive water leak at a nuclear reactor in Hamaoka, Shizuoka Prefecture, Chubu Electric Power Co. said Tuesday.

The Nagoya-based utility said the mistakes may have caused a welded part at the bottom of a pressure vessel in the 540,000-kw plant’s No. 1 reactor to crack, leading to a leak in early July that averaged 80 liters of radioactive water each day.

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