TOKYO (AP) — Japan’s nuclear regulator on Wednesday upgraded the rating of a leak of radiation-contaminated water from a tank at its tsunami-wrecked nuclear plant to a “serious incident” on an international scale, and it castigated the plant operator for failing to catch the problem earlier.The Nuclear Regulation Authority’s latest criticism of Tokyo Electric Power Co. came a day after the operator of the Fukushima Dai-ichi nuclear plant acknowledged that the 300-ton (300,000-liter, 80,000-gallon) leak probably began nearly a month and a half before it was discovered Aug. 19.
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