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Because of the disaster at the nuclear power plant in Chernobyl, not many people live there. Chernobyl, Ukraine has a population of 500.
You probably mean at Chernobyl in the Ukraine, in 1986
the nuclear meltdown at Chernobyl.
The Ukraine
Chernobyl, Ukraine, in 1986, is probably what you are thinking of.
The world's worst known nuclear disaster was at Chernobyl, in the Ukraine. The Chernobyl Disaster, as it is called, happened on April 26, 1986. There is a link to a Wikipedia article on this below.
Nuclear power accidents are a disaster. The 1986 nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine was a catastrophic accident.
Chernobyl, Ukraine, 1986
Ukraine
There was no famous disaster (or anything else) at Chernobyl in Russia as there is no such place. However for the disaster that occurred in Chernobyl in the Ukraine, please see the related question.
The city of Pripyat (Prypiat) in Ukraine was built has the home of employees of the Chernobyl Nuclear Power Plant. It was abandoned after the Chernobyl disaster.
Chernobyl is in northern Ukraine, near the border with Belarus.