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In the first five days after the disasters struck, the Fukushima complex saw explosions and fires in four of the plant's six reactors, and the leaking of radioactive steam into the air. Since then, progress has been made cooling the active reactors and replenishing spent fuel pool, though setbacks have occurred. The bubbling in Unit 2's storage pool is worrisome. If unabated, the water could boil away, exposing fuel rods that would throw up more radiation. At extremely high temperatures, the zirconium cladding around the rods could melt and explode. Nishiyama, the agency official, said the rods had been partly exposed; an agency spokesman Shinji Kinjo believed the rods remained covered. An official of the U.S. Nuclear Regulatory Commission said in Washington that Units 1, 2 and 3 have all seen damage to their reactor cores, but that containment is intact. The commission's executive director, Bill Borchardt, said that "things appear to be on the verge of stabilizing." The Vienna-based International Atomic Energy Agency said that radiation seeping into the environment is a concern and needs to be monitored. "We are still in an accident that is still in a very serious situation," said Graham Andrew, senior adviser to IAEA chief Yukiya Amano. IAEA monitoring stations have detected radiation 1,600 times higher than normal levels
-- but in an area about 12 miles (20 kilometers) from the power station, the limit of the evacuation area declared by the government last week. Radiation at that level, while not high for a single burst, could harm health if sustained. If projected to last three days, radiation at those levels would U.S. authorities would order an evacuation as a precaution. The levels drop dramatically the further you go from the nuclear complex. In Tokyo, about 140 miles (220 kilometers) south of the plant, levels in recent days have been higher than normal for the city but still only a third of the global average for naturally occurring background radiation.
[Associated
Press;
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