Iwaki, Japan - partial melting was probably the second nuclear reactor, top Japanese official said Sunday, as authorities frantically trying to prevent a similar threat to close the unit after the devastating earthquake and tsunami.

Some 170,000 people were ordered to evacuate the area covering a radius of 12 miles (20 kilometers) around the plant near Iwaki, Fukushima. The merger refers to a serious collapse of systems of a power plant and its ability to handle the temperatures. A total collapse would release uranium and dangerous products into the environment that can pose serious health risks.

Japan faces a nuclear threat to try to determine the scope of individual disaster on Friday when an earthquake of magnitude 8.9, the most powerful in history, was followed by a tsunami that devastated the northeast coast with impressive speed and power .

The death toll is 763, but the government said the number could exceed 1,000. According to press reports, some 10,000 people are missing or unaccounted for.

The earthquake and tsunami damaged three reactors at the Fukushima Dai-ichi Nuclear, which has lost its function of cooling needed to maintain the fuel rods is working properly. At first, the Unit 1 reactor was struggling with an explosion destroyed the walls of the room in which it is placed. Later, the Unit 3 has also started having problems.

Cabinet Secretary said Yukio Edan players released slightly radioactive air in Unit 3 on Sunday, when injected into water to reduce the pressure and temperature, you can save the fusion reactor.

Even a partial melting of the unit is "very possible" he told reporters.

"Because it is inside the reactor, we can not verify this directly, but we are taking steps in the hypothesis of possible partial collapse," he said.

Edan said radiation levels briefly rose above the legal limits, but has since declined significantly. In addition, the fuel rods were exposed briefly, he said, indicating that cooling water is not applied to drift for a while. This would also help to raise the temperature of the reactor vessel.

Meanwhile, the government has doubled the troops pressed on the rescue and recovery of about 100,000 from 51,000.

Teams searching for missing along hundreds of kilometers (miles) and the Japanese coast, and thousands of hungry families huddled in a dark call centers, which were separated by rescuers and aid. At least one million families were left without water since the earthquake. Large rural areas were surrounded by water and inaccessible. About 2.5 million households were left without electricity.

Powerful aftershocks continued to shake the country, including one Sunday with a magnitude of 6.2 occurred at about 111 sea miles (179 km) east of Tokyo. It swayed buildings in the capital, but there were no reports of casualties or damage.

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