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Division Spotlight
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.
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.
Takashi Nakamura, Toshiso Kosako, Katsumi Hayashi, Shuichi Ban, Kazuaki Katoh
Nuclear Science and Engineering | Volume 77 | Number 2 | February 1981 | Pages 182-191
Technical Paper | doi.org/10.13182/NSE81-A21352
Articles are hosted by Taylor and Francis Online.
The dose distribution and the spectrum variation of neutrons due to the skyshine effect have been measured with various detectors in the environment surrounding the electron synchrotron of the Institute for Nuclear Study, University of Tokyo. The dose distribution and the spectra of neutrons on the outer surface of the concrete shield of the synchrotron building were also measured in order to get information on the skyshine source. The measured neutron spectra both at the source and in the environment show an approximate 1/E spectrum below ∼100 keV, but the latter is much softer than the former above that energy. These experimental data were analyzed with the multigroup Monte Carlo code, MMCR, with the result that the calculated results are in good agreement with the experiment. This experiment is uniquely worthwhile since the skyshine of the radiation directed almost vertically into the air from the accelerator building was measured and the energy spectrum and dose distributions of the neutron source were clarified.