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Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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.”
F. W. Staub, N. Zuber
Nuclear Science and Engineering | Volume 30 | Number 2 | November 1967 | Pages 296-303
Technical Paper | doi.org/10.13182/NSE67-A17339
Articles are hosted by Taylor and Francis Online.
The void propagation equation is applied to predict the void response to both flow and power oscillations in a boiling liquid in forced flow through a duct with axially nonuniform power input. The analysis and the solution are presented in dimensionless form so they may be applied to various systems of practical interest. For the range of parameters examined in this paper, neither the steady-state void fraction nor the transient void response are significantly affected by the shape of the axial power-input distribution to the fluid. The predicted void response to combined flow and power-input oscillations to the fluid indicates that: 1) The void propagation velocity is about the same whether the power alone, flow alone, or power and flow together are oscillated, provided all other parameters are unchanged. 2) Flow oscillations in phase with power oscillations reduce the amplitude of the void oscillations below the values that would be present with either the same power or flow oscillations acting alone. 3) Flow oscillations 180° out of phase with power oscillations result in void oscillations whose amplitudes are roughly equal to the sum of the void amplitudes that would exist with the respective power and flow oscillations acting alone.