From boston.com:
Japan admitted yesterday that it was unprepared for a severe nuclear accident like the tsunami-caused Fukushima disaster, and said damage to the reactors and radiation leakage were worse than it previously thought.
In a report being submitted to the UN nuclear agency, the government also acknowledged reactor design flaws and a need for greater independence for the country’s nuclear regulators.
The report said the nuclear fuel in three reactors probably melted through the inner containment vessels, not just the core, after the March 11 earthquake and tsunami knocked out the Fukushima Daiichi nuclear plant’s power and cooling systems. Fuel in the Unit 1 reactor started melting hours earlier than previously estimated.
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