See LAT, "Post-quake events at Japan nuclear plant raise concerns":
A portion of Japan's nuclear reactors have been shut down in the wake of the earthquake and subsequent tsunami, but officials are worried about the Fukushima plant, where the emergency cooling system is problematic.See also NYT, "Quake and Tsunami Leaves Wake of Destruction Across Northern Japan." And "Japan Orders Evacuation Near 2nd Nuclear Plant" (via Memeorandum).
About 18% of Japan's 33 nuclear reactors have been shut down in the wake of the magnitude 8.9 earthquake that struck offshore Friday and triggered a massive tsunami, but officials are particularly troubled by events at one of them — the 480-megawatt Fukushima No. 1 plant in Fukushima Prefecture, where the emergency cooling system has not been functioning properly.
Emergency authorities have ordered the evacuation of all civilians in a two-mile radius around the power plant, a total of about 3,000 people, and are planning to vent slightly radioactive steam from the plant, which is located about 160 miles north of Tokyo. Those within a six-mile radius were warned to stay in their homes.
RELATED: At Scientific American, "How to Cool a Nuclear Reactor."