The accident at the Chernobyl nuclear power plant is regarded as the worst nuclear accident in history. Radioactive debris from the disaster drifted across parts of the western Soviet Union and Europe. Large areas of Ukraine, Belarus, and Russia were badly contaminated, resulting in the resettlement of hundreds of thousands of people and a disputed number of deaths. The incident set off an international outcry over the dangers posed by radioactive emissions. What caused the accident? Discuss (http://forum.thefreedictionary.com/postst57295_Nuclear-Reactor-at-Chernobyl-Plant-Explodes--1986-.aspx)