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
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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
Fusion Science and Technology
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.
T. D. Reilly, E. R. Martin, J. L. Parker, L. G. Speir, R. B. Walton
Nuclear Technology | Volume 23 | Number 3 | September 1974 | Pages 318-327
Technical Paper | Instrument | doi.org/10.13182/NT74-A15924
Articles are hosted by Taylor and Francis Online.
A system has been developed to measure continuously the 235U and 234U enrichment in the UF6 product of a gaseous diffusion plant. The measurements are made on liquid UF6 prior to withdrawal into product cylinders. The 235U enrichment is measured to a relative accuracy of 0.5% at two sigma by counting the 185.7-keV gamma ray from 235U with an NaI detector. The 234U enrichment is measured with a neutron detector counting (α,n) neutrons from UF6. The neutron system can measure either 234 U enrichment directly or 235 U enrichment indirectly (for low-enriched uranium, 2 to 5% 235U, the two enrichments are nearly proportional). The accuracy of the neutron measurement is 2.5% at two sigma. The gamma and neutron measurements are independent and could be used singly if only one isotope were desired. Both are required to measure 235 U and 234 U enrichment. The system is presently installed at the Goodyear Atomic Corporation gaseous diffusion plant in Piketon, Ohio.
