Information about serious nuclear power plant incidents, attacks upon nuclear reactors, criticality incidents (uncontrolled nuclear reactions) and notable radiation accidents (since the 1990's).
Hover over the map pins for information about radiation incidents at that location. You can zoom in or out and pan using the map controls on the left.
Introduced in 1990, the International Nuclear and Radiological Event Scale (INES) was created by the International Atomic Energy Agency (IAEA) as a way to describe the relative severity of nuclear events. It ranges from a grade 0 (Deviation - no safety significance) through 7 (Major Accident - a major release of radioactive material with widespread health and environmental implications.) As of January 2014, only two incidents - the 1986 Chernobyl disaster and the disaster at the Fukushima Daiichi plant following the 2011 tsunami - have been rated a 7.
This map shows radiation accidents that were classified at level 2 (Incident) or higher.