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Conference Spotlight
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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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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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.
Hugh K. Clark
Nuclear Science and Engineering | Volume 15 | Number 1 | January 1963 | Pages 20-28
Technical Paper | doi.org/10.13182/NSE63-A26260
Articles are hosted by Taylor and Francis Online.
A simple technique is described for computing the interaction in groupings of fissionable units. The units may be slabs, cylinders, or spheres and may be surrounded by a reflector. The validity of the approximations employed is discussed. The technique is illustrated by applying it to the specific example of calculating the interaction in a reflected cubic array of eight spheres of uranium (93.5% U235). Comparisons are made with experiment and with other methods of calculation.
