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On This Day, April 26: Chernobyl Nuclear Reactor Explodes in Ukraine

The test exposed design flaws and operator errors that drove a 100-times-normal power surge, officials said.

Summary by UPI
On April 26, 1986, a fire and explosion at the Soviet Union's Chernobyl nuclear reactor north of Kiev, Ukraine, resulted in the world's worst civilian nuclear disaster.

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Lean Left

The timeline of the events following the accident at the nuclear power plant. Eighteen days later Gorbachev declared: "The worst has passed." But still today men and...

·Turin, Italy
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On April 26, 1986, the worst nuclear disaster in human history occurred—the explosion of a reactor at the Chernobyl nuclear power plant. Contaminated land, a radioactive cloud over Europe, and the tragedy of thousands of people—the events of forty years ago still resonate.

Tests similar to the one in 1986 were also conducted in 1982 and 1984.

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Live Science broke the news in United States on Saturday, April 25, 2026.
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