What other reactor did the supervisor of construction of the reactor that went critical under the supervision of Enrico Fermi build?
Walter Zinn:  At Argonne he designed and built several new reactors, including Experimental Breeder Reactor I, the first nuclear reactor to produce electric power, which went live on December 20, 1951. Chicago Pile-1:  The first human-made self-sustaining nuclear chain reaction was initiated in CP-1 on 2 December 1942, under the supervision of Enrico Fermi, who described the apparatus as "a crude pile of black bricks and wooden timbers".
Experimental Breeder Reactor I