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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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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.
J. W. Meadows, J. F. Whalen
Nuclear Science and Engineering | Volume 13 | Number 3 | July 1962 | Pages 230-236
Technical Paper | doi.org/10.13182/NSE62-A26157
Articles are hosted by Taylor and Francis Online.
The pulsed source method has been used to measure the thermal neutron diffusion parameters of zircaloy-2 hydride whose approximate composition is ZrH1.7. The asymptotic decay constant (zeroth energy eigenvalue) has been measured for the buckling range 0.03 < B2 < 0.39 cm−2 and has been fitted by a polynomial containing terms to B8. The first energy eigenvalue has been measured over the range 0.05 < B < 0.39 cm−2 and has been used to estimate the thermalization time constant. In addition the thermalization time constant has also been determined from time dependent transmission measurements with 1 /υ absorbers.
