When did Enrico Fermi's Chicago Pile-1 first achieve a self-sustaining chain reaction?

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Labeled diagram showing the process of a nuclear power plant with a pressurized-water reactor. Water circulates through the reactor core, heats to produce steam in a steam generator, which drives a turbine connected to an electric generator. Steam is then cooled in a condenser using water from a cooling tower, which releases nonradioactive water vapor. Control rods, pumps, and transmission lines are also indicated. — nuclear power Schematic diagram of a nuclear power plant using a pressurized-water reactor.

Enrico Fermi's Chicago Pile-1 (CP-1) first achieved a self-sustaining nuclear chain reaction on December 2, 1942.123

The experiment took place under the football stands at the University of Chicago as part of the Manhattan Project. The reactor, which was constructed using graphite blocks as a moderator and uranium as fuel, successfully demonstrated that a nuclear reaction could be initiated, controlled, and stopped. This milestone served as a critical prototype for the development of larger nuclear reactors and the advancement of nuclear technology.143