Michio Kaku: Japan's Possible Nuclear Meltdown
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Thousands of residents were evacuated from an area around a nuclear plant in quake-hit Japan after radiation levels rose in the reactor, but there was no word on whether there had actually been a leak.
Underscoring grave concerns about the Fukushima plant some 240 km (150 miles) north of Tokyo, U.S. Secretary of State Hillary Clinton said the U.S. air force had delivered coolant to avert a rise in the temperature of the facility's nuclear rods.
Tokyo Electric Power Co said pressure inside a reactor at its Fukushima-Daiichi plant rose after the cooling system was knocked out by the earthquake, the largest on record in Japan.