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Conference Spotlight
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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
Japan gets new U for enrichment as global power and fuel plans grow
President Trump is in Japan today, with a visit with new Prime Minister Sanae Takaichi on the agenda. Takaichi, who took office just last week as Japan’s first female prime minister, has already spoken in favor of nuclear energy and of accelerating the restart of Japan’s long-shuttered power reactors, as Reuters and others have reported. Much of the uranium to power those reactors will be enriched at Japan’s lone enrichment facility—part of Japan Nuclear Fuel Ltd.’s Rokkasho fuel complex—which accepted its first delivery of fresh uranium hexafluoride (UF₆) in 11 years earlier this month.
S. Shalev, G. Shani, Z. Fishelson, and Y. Ronen
Nuclear Science and Engineering | Volume 35 | Number 2 | February 1969 | Pages 259-266
Technical Paper | doi.org/10.13182/NSE69-A21141
Articles are hosted by Taylor and Francis Online.
As part of a comprehensive project to investigate the validity of pulsed-neutron measurements in small systems, we have measured the extrapolation length in a pulsed light-water system with B2 = 0.11/cm2. Space- and time-dependent flux distributions were obtained with a miniature fission chamber and were analyzed by least-squares techniques. Special attention was paid to the extraction of the fundamental mode and to the overall internal consistency of the results. The thermal-neutron extrapolation length, corrected to 20°C, was found to be 0.300 ± 0.015 cm.
