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
Materials Science & Technology
The objectives of MSTD are: promote the advancement of materials science in Nuclear Science Technology; support the multidisciplines which constitute it; encourage research by providing a forum for the presentation, exchange, and documentation of relevant information; promote the interaction and communication among its members; and recognize and reward its members for significant contributions to the field of materials science in nuclear technology.
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
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.
Y. Ronen, Y. Dali
Nuclear Science and Engineering | Volume 130 | Number 2 | October 1998 | Pages 239-253
Technical Paper | doi.org/10.13182/NSE98-A2003
Articles are hosted by Taylor and Francis Online.
A new concept for a core in a high-conversion reactor is presented. This core consists of tight lattice fuel elements enriched with plutonium. These fuel elements are made up of layers of higher enrichment (mixed-oxide fuel) and natural uranium; therefore, the core is composed of alternate layers of high- and low-enrichment fuels. The reactor with this core was nicknamed "Big Mac."Due to spectral effects and leakage into and out of the different zones, it was found that this reactor has a high conversion ratio >0.9 with negative void coefficient, a relatively long fuel cycle, with 6% average fissile plutonium enrichments. Several interesting spectral effects were found and analyzed.
