ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
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.”
T. E. Dudley, P. B. Daitch
Nuclear Science and Engineering | Volume 25 | Number 1 | May 1966 | Pages 75-84
Technical Paper | doi.org/10.13182/NSE66-A17503
Articles are hosted by Taylor and Francis Online.
The monoenergetic transport equation is solved in the P3 approximation for a cylindrical rod in a square cell. Reflecting boundary conditions applied on the boundary of the cell represent exactly the geometry of cylindrical rods in an infinite square-lattice array. By comparison with Monte Carlo calculations, the P3 calculations appear to approach the exact transport solution at about the same rate in two dimensions as in one dimension. For the cases investigated, the scalar flux in the central absorbing rod is rather independent of the angular position. This appears to be the reason for the success of the Wigner-Seitz equivalent cylindrical cell, with various outer boundary conditions, in predicting flux disadvantage factors. Flux traverses in the square cell and in the Wigner-Seitz equivalent cylindrical cell are also illustrated.
