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Division Spotlight
Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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
Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
S. Nakamura
Nuclear Science and Engineering | Volume 61 | Number 1 | September 1976 | Pages 98-106
Technical Paper | doi.org/10.13182/NSE76-A28465
Articles are hosted by Taylor and Francis Online.
The accelerating effect of coarse-mesh rebalancing on the low-order Chebyshev polynomial iterations to obtain the fundamental eigenvector of large homogeneous linear systems associated with elliptic partial-differential equations is mathematically analyzed. Coarse-mesh rebalancing is shown to have a positive accelerating effect if one of the following conditions is met: (a) the weighting vectors are not contaminated with high eigenvector components, (b) Galerkin's weighting vectors are used, or (c) the non-Galerkin weighting vectors are similar to the trial vectors. As another interesting result, it is shown that the overshooting effect is related to the fourth and higher eigenvector components that have spatially odd parities. If the above condition, (c), is met, there is no overshooting; otherwise, the acceleration effect with non-Galerkin weighting vectors is unpredictable.
