The effort to steer the Fukushima No. 1 nuclear power plant away from disaster suffered another setback when workers discovered widespread uncontrolled leaking of radioactive water at the six-reactor complex.
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Since the March 11 tsunami knocked out power, plant workers have been intentionally venting radioactive steam into the air to keep overheated reactor cores from bursting. Radioactive steam has also gone aloft from overheated storage pools for used fuel.