The Fukushima Nuclear Crisis
Japan has 55 nuclear reactors at 19 sites. Two more are under construction and another twelve are in the advanced planning stage. Net Generating capacity is around 50 GW providing around 30% of the country's electricity (more here).
As a result of Japan’s largest earthquake in history on March 11 and subsequent tsunami all reactors shut down automatically as they were designed to do but cooling systems associated with two sites had been damaged.
Three reactor sites are adjacent to the earthquake epicentre and two were in the direct path of the tsunami. The Fukushima-Daiichi plant belonging to Tokyo Electric Power Company was particularly hard hit. It lost all grid connections, providing electricity, and its backup power plant was seriously damaged.
Read more: The Fukushima Nuclear Crisis