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The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
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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.”
Sang-Nyung Kim, Byung-Marn Koh, Joon-Suk Ji
Nuclear Technology | Volume 153 | Number 3 | March 2006 | Pages 304-314
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT06-A3709
Articles are hosted by Taylor and Francis Online.
When reactivity insertion such as refueling occurs in Canada deuterium uranium (CANDU) reactors, the power and the water level are tilted in the upper outer zone of the liquid zone control system (LZCS) and fluctuate unstably for a certain period of time (1 to 5 days). Such instability is observed in most of the CANDU reactors in service around the world, but neither its root cause has been identified nor have solutions against it been established. Therefore, this study experimentally and analytically attempted to prove that the root cause lies in the holdup of light water on the top of the tube support plate (TSP) due to the mismatch between the net volumetric flow rate of light water and helium crossing the narrowed porous TSP installed within the LZCS compartment by performing hydrodynamic simulation of the inflow/outflow of light water and helium. Two solutions against the aforementioned instability of LZCS were suggested. One is to regulate volumes of helium gas flowing into the compartment and light water flowing therefrom, and the other is to enlarge the flowing paths of helium and light water within the TSP. The former may be applicable to nuclear reactors in service and the latter to those planned to be constructed.