During the Manhattan Project, Wigner led a team that included Alvin M. Weinberg , Katharine Way , Gale Young and Edward Creutz . The group's task was to design the production nuclear reactors that would convert uranium into weapons grade plutonium. At the time, reactors existed only on paper, and no reactor had yet gone critical . In July 1942, Wigner chose a conservative 100 MW design, with a graphite neutron moderator and water cooling.  Wigner was present at a converted rackets court under the stands at the University of Chicago 's abandoned Stagg Field on December 2, 1942, when the world's first atomic reactor, Chicago Pile One (CP-1) achieved a controlled nuclear chain reaction . 
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