<P> The Chernobyl accident is considered the most disastrous nuclear power plant accident in history , both in terms of cost and casualties . It is one of only two nuclear energy accidents classified as a level 7 event ( the maximum classification ) on the International Nuclear Event Scale , the other being the Fukushima Daiichi nuclear disaster in Japan in 2011 . The struggle to safeguard against scenarios which were perceived as having the potential for greater catastrophe , together with later decontamination efforts of the surroundings , ultimately involved over 500,000 workers and cost an estimated 18 billion rubles . </P>
<P> The Chernobyl accident is considered the most disastrous nuclear power plant accident in history , both in terms of cost and casualties . It is one of only two nuclear energy accidents classified as a level 7 event ( the maximum classification ) on the International Nuclear Event Scale , the other being the Fukushima Daiichi nuclear disaster in Japan in 2011 . The struggle to safeguard against scenarios which were perceived as having the potential for greater catastrophe , together with later decontamination efforts of the surroundings , ultimately involved over 500,000 workers and cost an estimated 18 billion rubles . </P>
where did the worst nuclear disaster in history occur
where did the worst nuclear disaster in history occur
Chernobyl
Chernobyl