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
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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.
H. D. Ringel, E. Zimmer
Nuclear Technology | Volume 45 | Number 3 | October 1979 | Pages 287-298
Technical Paper | Fuel | doi.org/10.13182/NT79-A32297
Articles are hosted by Taylor and Francis Online.
For refabrication of high-temperature reactor fuel elements, a process for producing dense ThO2 and (Th,U)O2 microspheres has been developed. The process is an external gelation process and takes full advantage of the gelation features of thorium hydroxide for formation of particles. Unlike other external gelation methods, neither viscosity increase by adding other substances (e.g., organic polymers) to the broth nor drop formation in organic liquids is employed. The method uses few process steps and only simple process equipment. A pilot plant has been constructed that operation with one nozzle can produce 1 kg/h of (Th,U)O2 microspheres 500 µm in diameter.
