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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.”
A. D. Caldeira, A. F. Dias, R. D. M. Garcia
Nuclear Science and Engineering | Volume 130 | Number 1 | September 1998 | Pages 70-78
Technical Paper | doi.org/10.13182/NSE98-A1990
Articles are hosted by Taylor and Francis Online.
A degeneracy that may occur in the PN solution to the multigroup slowing-down problem reported in part I of this work is studied. The considered degeneracy is of first order, i.e., it connects only two groups in the defined multigroup structure. The singularities caused by the higher-energy group in the particular solution for the lower-energy group are removed by (a) adding to this solution convenient multiples of the PN modes that define the homogeneous solution for the lower-energy group and (b) applying a limiting procedure to the resulting expression. The propagation of the degenerate solutions to other groups below the lower-energy group is also studied. A test problem posed some years ago in the context of the FN method is solved to demonstrate the consistency of the developed degenerate solutions. Numerical results are tabulated for several orders of the approximation and are compared with previously reported FN results.