Worst Nuclear Disaster:Chernobyl

The Chernobyl disaster was a nuclear reactor accident at the Chernobyl Nuclear Power Plant in Ukraine, then part of the Soviet Union. It is considered to be the worst nuclear power plant disaster in history and the only level 7 instance on the International Nuclear Event Scale. It resulted in a severe release of radioactivity following a massive power excursion which destroyed the reactor. The overall cost of the disaster is estimated at US$200 billion, taking inflation into account. This places the Chernobyl disaster as the most costly disaster in modern history.