The leak, discovered Friday, caused no environmental impact as it was contained within an idled reactor at the Genkai nuclear plant in Saga prefecture in the southern Kyushu region, officials said.
Workers are still scrambling to contain a separate ongoing crisis at the Fukushima No. 1 nuclear plant, triggered by the March earthquake and tsunami that hit northeastern Japan.
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Editor's Note: Map of Genkai Nuclear Power Plant below.
View Live Ustream Radiation Detectors in a larger map