7. 6. Click ahead to see 11 other history-making nuclear disasters. A radioactive explosion in 1957 in the Ural Mountains was the true original. 1999 Sept. 30, Tokaimura, Japan: uncontrolled chain reaction in a uranium-processing nuclear fuel plant spewed high levels of radioactive gas into the air, killing two workers and seriously injuring one other. The Chernobyl nuclear disaster is one of the two, level 7 nuclear accidents in history. An accident at a uranium processing plant in Tokaimura exposed 55 workers to radiation; one died. Quick -how many nuclear accidents can you name? On April 26, 1986, the world's worst nuclear disaster befell the Chernobyl, Ukraine Power Plant. Level 5 The plant’s reactor in Unit 4 experienced a surge of power and a full reactor meltdown. It occurred when a surge in power of the nuclear reactor resulted in an explosion and fire. Level 6 Britain’s first nuclear reactor, Windscale, was built in the late 1940s. The Worst Nuclear Disasters As fears of a meltdown at the earthquake and tsunami-damaged Fukushima nuclear plant persist, TIME takes a look at some of the more frightening nuclear mishaps of the past A Brief History of the Exxon Valdez Disaster All maps, graphics, flags, photos and original descriptions © 2020 worldatlas.com, International Nuclear and Radiological Event Scale, The Worst Disasters in the History of the United Kingdom, Level 5 - Accident With Wider Consequences, Level 4 - Accident With Local Consequences. No deaths occurred as a result of the meltdown. The incident occurred when a reactor, known as "Unit 1", caught fire. Doses off-site were less than normal background radiation. Tokyo Electric Power Co.—Kyodo News/AP. Four people died in worst radiation disaster in Western Hemisphere. It was the worst earthquake in Japan's history and one of the worst tsunamis to strike the world in recorded history. 1957–Windscale Pile, Great Britain Nuclear technology produces radioactive waste that comes into contact with humans and the environment during reactor accidents and waste storage leaks. By the time the fire was extinguished, the UK and large swathes of Europe were already under a radioactive cloud. However, the clean-up required was arduous and involved hundreds of volunteers and military personnel. “The Worst Nuclear Disaster in U.S. History” For twelve years, things ran smoothly, but on July 1, high levels of radiation leaked from the Sodium Reactor Experiment (SRE). Today, around 5 million people live in radionuclide contaminated zones, and they still lack the information they need to live healthy lives. The Chernobyl nuclear disaster forced 350,000 people to be evacuated over fears of radiation poisoning. Dec 29 During testing, an explosion occurred that ended in 9 days of fires and radiation emissions. Content is available under CC BY-SA 3.0 unless otherwise noted. During testing, an explosion occurred that ended in 9 days of fires and radiation emissions. It was the first nuclear accident in the history of all nuclear energy. Get the full list and find out how they’re ranked. Embed Share. Level 7 Major Accident: A major release of radioactive material with widespread health and environmental effects requiring implementation of planned and extended countermeasures. 10 Worst Nuclear Disasters Presenting 10 nuclear disasters that might make you head for the fallout shelter. 3. One of the worst disasters which took place in history is Chernobyl disaster in 1986 in Ukraine. Nuclear disaster at the uranium fuel treatment plant in T… Radiation in the environment can result in significantly reduced plant growth and animal deaths. 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