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ANS Student Conference 2025
April 3–5, 2025
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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.”
D. V. Gopinath, A. Natarajan, V. Sundararaman
Nuclear Science and Engineering | Volume 75 | Number 2 | August 1980 | Pages 181-184
Technical Note | doi.org/10.13182/NSE80-A21307
Articles are hosted by Taylor and Francis Online.
In the anisotropic source flux iteration technique for solving the radiation transport problems for evaluating the flux integral, the source within the mesh was approximated to a linear form using the nodal source values. It is shown in this Note that at the start of each iteration, in addition to the nodal sources, the source integral over the mesh is also available. Using the source integral as an additional parameter, several linear approximations and a quadratic approximation for the source distribution within the mesh are possible. This Note discusses the relative merits of the various approximations. A comparative analysis of these approximations with the different difference schemes currently in use is also given. Among the linear schemes, the ones retaining the source integral and the gradient or source integral and the terminal nodal source provide very good accuracy. It is also shown that the quadratic scheme retaining both the nodal sources and the source integral provide far more accurate results without significant increase in computer time or memory.
