Nuclear explosions are not controlled. Nuclear reactors are controlled.
The first controlled nuclear reaction in the US was on December 2, 1942.
The first nuclear explosion in the US was on July 16, 1945.
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There have been many nuclear explosion in the US in places like, Nevada and New Mexico. In anger against the US no. Japan still remains the only country in the world to be bomb in anger with nuclear weapons.
The Shippingport reactor was the first full-scale PWR nuclear power plant in the United States.
The Manhattan Project resulted in the US creating the first nuclear bomb, which was the cause for Japan to surrender.
Very good question. It probably happened in the 1950s on an experimental reactor on the INEL site in Idaho. I know that their EBR-1 reactor was damaged by a partial meltdown in that time period, but I don't know if it was the first. I have considered making a FOIA request to them on that subject.
ENGLAND!!!