Several of Japan's nuclear power plants are experiencing serious damage from the earthquake and ensuing tsunami. Here's what you need to know to understand the news, as it happens Several of Japan's nuclear power plants, especially the Fukushima Naiishi plant in northeastern Japan, are experiencing serious problems in the wake of Friday's earthquake and tsunami. If you've been following the news, you've seen some pretty alarming stuff going on at this plant--terms like "explosion," "partial meltdown," "evacuation," and "radiation exposure." Scary stuff. Here's what you need to know to understand and keep up with the news unfolding in Japan.What Is a Nuclear Reaction?