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National Museum of Nuclear Science & History

Jack Hefner joined the Manhattan Project at Oak Ridge in 1943. Hefner was a reactor engineer and helped supervise the construction of the X-10 Graphite Reactor. Later, he transferred to Hanford and worked as a shift engineer, where he monitored the B Reactor. Hefner also helped maintain Hanford's sprawling facilities, including office buildings and houses in the 700 Area.

Jack Hefner's Timeline
1943 Joined the Manhattan Project at Oak Ridge.

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