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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