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ANS Student Conference 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.”
Kenji Yokoyama, Akira Shono, Makoto Ishikawa
Nuclear Science and Engineering | Volume 157 | Number 3 | November 2007 | Pages 249-263
Technical Paper | doi.org/10.13182/NSE06-109
Articles are hosted by Taylor and Francis Online.
Experimental data acquired during experimental fast reactor JOYO MK-I performance tests in the late 1970s have been reevaluated and analyzed with a nuclear analysis system for fast reactors employed by the Japan Atomic Energy Agency. For the purpose of improving the prediction accuracy of nuclear characteristics, nominal values and uncertainties of the experimental data were reevaluated in light of knowledge obtained after the MK-I performance test and calculation results based on the latest reactor physics analysis methods. All nominal values were corrected by a formulation of control rod interaction effects proposed in the present paper, and all possible uncertainty factors were evaluated and quantified.The analysis results agreed well with measured values within the experimental and nuclear-induced uncertainties for all the nuclear characteristics of criticality, control rod worth, sodium void reactivity, fuel replacement reactivity, and isothermal temperature coefficient.Meanwhile, the present reevaluated data have been registered with the International Reactor Physics Benchmark Experiments Project with the expectation that these data will be widely used.