Science & Tech
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The world’s first nuclear reactor was rebuilt at this site in 1943 after initial operation at the University of Chicago. This reactor (CP-2) and the first heavy water moderated reactor (CP-3) were major facilities around which Argonne National Laboratory developed. This site was released by the laboratory in 1956, and the U.S. Atomic Energy Commission then buried the reactors here.
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Willow Springs, Illinois · United States
