ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Education, Training & Workforce Development
The Education, Training & Workforce Development Division provides communication among the academic, industrial, and governmental communities through the exchange of views and information on matters related to education, training and workforce development in nuclear and radiological science, engineering, and technology. Industry leaders, education and training professionals, and interested students work together through Society-sponsored meetings and publications, to enrich their professional development, to educate the general public, and to advance nuclear and radiological science and engineering.
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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Nuclear Science and Engineering
May 2025
Nuclear Technology
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Latest News
TerraPower begins U.K. regulatory approval process
Seattle-based TerraPower signaled its interest this week in building its Natrium small modular reactor in the United Kingdom, the company announced.
TerraPower sent a letter to the U.K.’s Department for Energy Security and Net Zero, formally establishing its intention to enter the U.K. generic design assessment (GDA) process. This is TerraPower’s first step in deployment of its Natrium technology—a 345-MW sodium fast reactor coupled with a molten salt energy storage unit—on the international stage.
L. E. Hansen, E. D. Clayton
Nuclear Technology | Volume 6 | Number 4 | April 1969 | Pages 381-390
Technical Papers and Note | doi.org/10.13182/NT69-A28348
Articles are hosted by Taylor and Francis Online.
Lack of experimental data for nuclear criticality control over operations with plutonium necessitates the use of computed critical parameters for guidance. To provide guidelines for criticality safety use, survey calculations for unreflected and water-reflected spheres, semi-infinite cylinders, and semi-infinite slabs have been made, using calculational techniques confirmed by available experimental data. The Pu(metal)-water mixtures examined cover the entire range of possible moderation ratios and have isotopic 240Pu contents of 20%. Critical experiment data for water-reflected spherical systems containing Pu(NO3)4 solutions with 435g Pu/liter at 4.6 wt% 240Pu were extrapolated by means of calculations to 239Pu(metal)-water mixtures for a direct comparison between calculations and experimentally derived critical parameters. The effect of 240Pu on criticality was examined as a function of both concentration and geometry. The manner in which 240Pu affected the minimum critical mass of Pu(metal)-water systems was also determined.
