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General Kenneth Nichols and the Manhattan Project
Nichols
The Oak Ridger has published the latest in a series of articles about General Kenneth D. Nichols, the Manhattan Project, and the 1954 Atomic Energy Act. The series has been produced by Nichols’ grandniece Barbara Rogers Scollin and Oak Ridge (Tenn.) city historian David Ray Smith. Gen. Nichols (1907–2000) was the district engineer for the Manhattan Engineer District during the Manhattan Project.
As Smith and Scollin explain, Nichols “had supervision of the research and development connected with, and the design, construction, and operation of, all plants required to produce plutonium-239 and uranium-235, including the construction of the towns of Oak Ridge, Tennessee, and Richland, Washington. The responsibility of his position was massive as he oversaw a workforce of both military and civilian personnel of approximately 125,000; his Oak Ridge office became the center of the wartime atomic energy’s activities.”
Sümer Şahın, Ralph W. Moir, Sabahattin Ünalan
Fusion Science and Technology | Volume 26 | Number 4 | December 1994 | Pages 1311-1325
Technical Paper | Fusion Reactor | doi.org/10.13182/FST94-A30316
Articles are hosted by Taylor and Francis Online.
A neutron physics analysis of the modified PACER concept was conducted to assess the required liquid zone thickness of which the volume fraction is 25% in the form of Li2BeF4 (Flibe) jets and 75% as void. These liquid jets surround a low-yield nuclear fusion explosive and protect the chamber walls. The neutronic calculations assumed a 30-m-radius underground spherical geometry cavity with a 1-cm-thick stainless steel liner attached to the excavated rock wall. Achievement of tritium breeding ratios of1.05 and LIS requires a Flibe thickness of 1.6 and 2.0 m, respectively, which results in average energy densities of 24 900 and 19085 J/g. Our calculations show that for a Flibe zone thickness > 2.5 m, the activation of the steel liner and rock would be low enough after 30 yr of operation that the cavity would satisfy the U.S. Nuclear Regulatory Commission's rules for “shallow burial” upon decommissioning, assuming other sources of radioactivity could be removed or qualified as well. This means that upon decommissioning, the site could essentially be abandoned, or the cavity could be used as a shallow burial site for other qualified materials.