Nuclear power plants create energy using a chemical reaction that produces large amounts of heat. Reactors (反应堆) in Japan have many long, thin rods，called fuel rods (棒), which must be kept cool.

　　If the reactor's fuel rods aren't cooled, the reaction

　　can burn out of control. That's what happened at the

　　two Japanese plants after the quake caused a power failure and the cooling systems malfunctioned (发生故障).

　　This overheating could cause radiation to escape and

　　sicken many people.

　　Japan's 54 nuclear reactors are built to withstand

　　the many small or moderate earthquakes the country

　　faces each year. But Friday's earthquake was one of the

　　most severe earthquakes ever recorded.

　　People exposed to unsafe levels of radiation have a

　　higher than normal risk of getting cancer. The Japanese

　　government has been distributing potassium iodide (碘化钾) pills to people in the surrounding areas to protect

　　those who may have come in contact with radiation from

　　the power plant. The pills flood the body with healthy

　　potassium iodide. The potassium iodide works to crowd out “bad” iodine in the body that may have been poisoned by radiation.

　　On Tuesday morning, 750 workers left the Fukushima Daiichi plant.

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