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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Spent fuel transfer project completed at INL
Work crews at Idaho National Laboratory have transferred 40 spent nuclear fuel canisters into long-term storage vaults, the Department of Energy’s Office of Environmental Management has reported.
Cory D. Ahrens
Nuclear Science and Engineering | Volume 170 | Number 1 | January 2012 | Pages 98-101
Technical Note | doi.org/10.13182/NSE10-69TN
Articles are hosted by Taylor and Francis Online.
Since the introduction of the angular segmentation or Sn method some 60 years ago, there have been many advances in the understanding of the method and many improvements to it. Indeed, the Sn method is now a widely used technique for deterministic solution of the transport equation. For three-dimensional (3-D) calculations, the method relies on numerical quadratures for the sphere, which integrate certain subspaces of spherical harmonics. The construction of such quadratures can be difficult. Here we report the development of new, highly efficient quadratures for the sphere that are invariant under the icosahedral rotation group. We compare the efficiency of the standard level-symmetric quadratures commonly used for 3-D Sn calculations and see that the new quadratures can be as much as 70% more efficient than the standard quadratures.