Japan Nuclear Crisis: Reactors 3 and 4 Remain Biggest Concerns at Fukushima Daiichi Plant

New thermal imaging today shows the biggest problem at Japan's crippled Fukushima Daiichi nuclear plant continues to be reactors 3 and 4, a U.S. official told ABC News. The temperature in reactor 4 has increased from Thursday, the official said, and the fuel rods -- which are supposed to be housed in a steel container surrounded by concrete -- are surrounded only by steel because the concrete has blown away. Limited progress has been made in restoring power to the reactors, said the official....Full Story
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