ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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!
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Latest News
DOE extends Centrus’s HALEU production contract by one year
Centrus Energy has announced that it has secured a contract extension from the Department of Energy to continue—for one year—its ongoing high-assay low-enriched uranium (HALEU) production at the American Centrifuge Plant in Piketon, Ohio, at an annual rate of 900 kilograms of HALEU UF6. According to Centrus, the extension is valued at about $110 million through June 30, 2026.
T. M. Tran, J. Ligou
Nuclear Science and Engineering | Volume 79 | Number 3 | November 1981 | Pages 269-277
Technical Paper | doi.org/10.13182/NSE81-A19404
Articles are hosted by Taylor and Francis Online.
The time-dependent linear Fokker-Planck equation governing the transport of fast ions in a spherical host medium is solved in the suprathermal energy range, including both continuous slowing down and angular diffusion. Because of the parabolic nature of the angular dispersion term, an implicit time-centered scheme is proposed. On the other hand, a second-order diamond approximation in energy and space is chosen to avoid the spurious numerical diffusion driven by the usual first-order methods. The last variable, the pitch angle cosine, is discretized by centered finite differences. Good accuracy is demonstrated when comparing the results of the proposed method with the “exact” values given in the literature for some benchmark problems or by checking energy and particle balance equations. A numerical code (CIRCE) based on this scheme has been developed; it can be coupled to standard one-dimensional hydrodynamics codes after a few straightforward modifications.