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Conference Spotlight
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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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.
Herbert Goldstein, Jeremiah Certaine
Nuclear Science and Engineering | Volume 10 | Number 1 | May 1961 | Pages 16-23
Technical Paper | doi.org/10.13182/NSE61-A25924
Articles are hosted by Taylor and Francis Online.
The moments method has been used to calculate the flux age at 1.44 ev in D2O and D2O-H2O mixtures of neutrons from various point isotropic sources. For the neutrons from a D-D source averaged overall solid angle and operating at a deuteron energy of 200 kev, the age in 99.8% D2O was computed to be 118.6 ± 1.2 cm2, in good agreement with the experimental value of Spiegel and Richardson. The rate of change of age for this source with very small admixtures of H2O was found to be —4.5% per 1% H2O, which agrees with the results of experiment and other calculations. Flux ages to 1.44 ev were also calculated for seven monoenergetic point sources from 2.00 to 2.98 Mev in energy. The approximate linearity of these ages with source energy is used to show that uncertainties in the angular distribution of the D-D source neutrons have a negligible effect on the averaged age. It is also shown that the 2.4 Mev antiresonance in oxygen is manifested in the age in D2O only as a correction to the first flight term.
