World Marks 25 Years Since Chernobyl Disaster
On Tuesday, the world marks 25 years since its worst nuclear power accident, the Chernobyl disaster.
The Chernobyl took placeon 26 April 1986 at the Chernobyl Nuclear Power Plant in the Ukrainian SSR (now Ukraine). An explosion and fire released large quantities of radioactive contamination into the atmosphere, which spread over much of Western Russia and Europe.
It is one of only two classified as a level 7 event on the International Nuclear Event Scale (the other being the recent Fukushima Daiichi nuclear incident)
The Chernobyl accident caused the largest uncontrolled radioactive release into the environment ever recorded for any civilian operation, and large quantities of radioactive substances were released into the air for about 10 days. This caused serious social and economic disruption for large populations in Belarus, Russia and Ukraine.
Several organisations have reported on the impacts of the Chernobyl accident, but all have had problems assessing the significance of their observations because of the lack of reliable public health information before 1986.
Chernobyl unit 4 is now enclosed in a large concrete shelter which was erected quickly (by October 1986) to allow continuing operation of the other reactors at the plant. A New Safe Confinement structure is due to be completed in 2014, being built adjacent and then will be moved into place on rails
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