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Leo Szilard invented nuclear reactors in 1933 and patented the idea in 1934 (GB630726) however for many reasons nothing could be done with the idea until after World War 2.

EBR-1 in the United States was one of the first experimental nuclear power plants. On December 21, 1951 it produced enough power to light the whole building.
The worlds first nuclear power plant became operational on June 27, 1954 Obninsk Russia just outside Moscow.

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