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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.”
Masaki Suwa, Atsuyuki Suzuki
Nuclear Technology | Volume 85 | Number 2 | May 1989 | Pages 187-205
Technical Paper | Chemical Processing | doi.org/10.13182/NT89-A34240
Articles are hosted by Taylor and Francis Online.
The pinching effect in a co-decontamination extraction process is investigated with much concern for criticality safety control. To predict the pinching effect, computer codes, such as PULCO, are used to make numerical simulations. Using computer codes for criticality safety control seems to be impractical, however, because some uncertainties are inevitably associated with the calculation due to the assumptions that are included in a simulation code; thus, a safety margin must be taken into account in designing extraction equipment. A new model for inferring pinching effects is proposed. It is based on knowledge that represents the intrinsic nature of the pinching effect and a co-decontamination process holding independent of process conditions. The predictions obtained from this model are conservative, but practical from the standpoint of criticality safety control. The margin in designing equipment can be reduced if the overall reliability of a measurement system in which this model is to be incorporated is high enough to predict pinching effects. The program of this model is written in logic programming language, C-Prolog.
