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Published: Saturday, March 12, 2011, 7:49 p.m.

Explosion at Japan nuclear plant, disaster toll rises

  • A girl who was left inside a building is rescued in Kesennuma, Miyagi, northern Japan on Saturday.

    Kyodo News

    A girl who was left inside a building is rescued in Kesennuma, Miyagi, northern Japan on Saturday.

  • A member of the Self-Defense Force carries an elderly man in tsunami-torn Natori, Japan, on Saturday.

    Yasushi Kanno / The Yomiuri Shimbun

    A member of the Self-Defense Force carries an elderly man in tsunami-torn Natori, Japan, on Saturday.

  • Oil refinery facility is on fire in Ichihara, Chiba Prefecture, near Tokyo on Friday.

    AP Photo / The Yomiuri Shimbun, Kenji Tada

    Oil refinery facility is on fire in Ichihara, Chiba Prefecture, near Tokyo on Friday.

  • Workers inspect a caved-in section of a prefectural road in Satte, Saitama Prefecture, after one of the largest earthquakes ever recorded in Japan sla...

    Workers inspect a caved-in section of a prefectural road in Satte, Saitama Prefecture, after one of the largest earthquakes ever recorded in Japan slammed its eastern coast Friday, March 11, 2011.

  • A tsunami strikes residences after a powerful earthquake in Natori, Miyagi prefecture, Japan, on Friday.

    Kyodo News

    A tsunami strikes residences after a powerful earthquake in Natori, Miyagi prefecture, Japan, on Friday.

  • Flames rise from houses and debris half submerged in Sendai, Miyagi Prefecture, after Japan was struck by a strong earthquake and tsunami off its nort...

    Kyodo News

    Flames rise from houses and debris half submerged in Sendai, Miyagi Prefecture, after Japan was struck by a strong earthquake and tsunami off its northeastern coast Friday.

  • Flames engulf a building near the Sendai airport in the Miyagi prefecture of Japan after the quake Friday.

    Kyodo News

    Flames engulf a building near the Sendai airport in the Miyagi prefecture of Japan after the quake Friday.

IWAKI, Japan — A partial meltdown was likely under way at a second nuclear reactor, a top Japanese official said Sunday, as authorities frantically tried to prevent a similar threat from nearby unit following a catastrophic earthquake and tsunami.
Some 170,000 people have been ordered to evacuate the area covering a radius of 12 miles around the plant in Fukushima near Iwaki. A meltdown refers to a very serious collapse of a power plant's systems and its ability to manage temperatures. A complete meltdown would release uranium and dangerous byproducts into the environment that can pose serious health risks.
Japan dealt with the nuclear threat as it struggled to determine the scope of the twin disasters Friday, when an 8.9-magnitude earthquake, the most powerful in its recorded history, was followed by a tsunami that ravaged its northeastern coast with breathtaking speed and power.
The official count of the dead was 763, but the government said the figure could far exceed 1,000. Media reports said some 10,000 people were missing or unaccounted for.
The quake and tsunami damaged three reactors at the Fukushima Dai-ichi nuclear plant, which lost their cooling functions necessary to keep the fuel rods functioning properly. At first the Unit 1 reactor was in trouble with an explosion destroying the walls of the room in which it is placed. Later, Unit 3 also began to experience problems.
Chief Cabinet Secretary Yukio Edano said operators released slightly radioactive air from Unit 3 Sunday, while injecting water into it as an effort to reduce pressure and temperature to save the reactor from a possible meltdown.
Still, a partial meltdown in the unit is "highly possible," he said.
"Because it's inside the reactor, we cannot directly check it but we are taking measures on the assumption of the possible partial meltdown," he said.
Edano said radiation levels briefly rose above legal limits, but that it has since declined significantly. Also, fuel rods were exposed briefly, he said, indicating that coolant water didn't cover the rods for some time. That would contribute further to raising the temperature in the reactor vessel.
Meanwhile, the government doubled the number of troops pressed into rescue and recovery operations to about 100,000 from 51,000.
Teams searched for the missing along hundreds of miles of the Japanese coast, and thousands of hungry survivors huddled in darkened emergency centers that were cut off from rescuers and aid. At least a million households had gone without water since the quake struck. Large areas of the countryside were surrounded by water and unreachable. Some 2.5 million households were without electricity.
Powerful aftershocks continued to rock the country, including one Sunday with a magnitude of 6.2 that originated in the sea, about 111 miles east of Tokyo. It swayed buildings in the capital, but there were no reports of injuries or damage.





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