What happened here?
On December 2, 1942, Chicago Pile-1 achieved the first controlled self-sustaining nuclear chain reaction.
Learn more about this event
The Dawn of the Nuclear Age Underground
Beneath the stands of Chicago's Stagg Field, surrounded by wooden timbers and graphite blocks, stood Enrico Fermi and his team. It was December 2, 1942, and the tension was palpable. After months of meticulous preparation, they were about to initiate the first controlled nuclear reaction. Much was at stake—success would mean a scientific breakthrough, while failure could be catastrophic.
When Fermi gave the command to remove the control rods, the Chicago Pile-1 reactor began to come to life. Rare neutrons started splitting uranium nuclei, releasing more energy and additional neutrons. This process sustained itself, marking a first in history. Fermi watched the measuring instruments, which confirmed that the reaction was stable and under control. The team erupted in joy—they had done it.
This day changed the world. Chicago Pile-1 demonstrated that nuclear energy was not only possible but controllable. In the short term, it led to the development of the atomic bomb, and in the long term, to the peaceful use of nuclear energy. Power plants around the world today utilize the principles discovered on that December day when humanity first harnessed the power of the atom.
Where it happened
Coordinates: 41.8179, -87.7307 · View larger map
FAQ
In what year did First Nuclear Reactor happen?
It happened: 1942.
What was First Nuclear Reactor?
On December 2, 1942, Chicago Pile-1 achieved the first controlled self-sustaining nuclear chain reaction.
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