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
Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
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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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.
D. P. Hines, S. Oldberg, E. L. Zebroski
Nuclear Technology | Volume 9 | Number 3 | September 1970 | Pages 338-345
Fuel Element Performance Model | Symposium on Theoretical Models for Predicting In-Reactor Performance of Fuel and Cladding Material | doi.org/10.13182/NT70-A28788
Articles are hosted by Taylor and Francis Online.
The steady-state theory of fuel pin swelling in which the majority of fuel pin diametral increase is ascribed to the effects of solid and gaseous fission product swelling of the fuel is in apparent conflict with a body of data relating to oxide fuel pins. The non steady-state or ratchetting theory holds that fuel-cladding mechanical interaction occurs by thermal expansion interaction of the fuel and cladding during reactor temperature or power changes. The primary rate determining mechanism is considered to be something other than the steady-fuel swelling rate. Examples of non-steady-state mechanisms, which experimental evidence suggests may be important, include fuel clad interference occurring during the first startup of the fuel pin, the buildup of porosity in the fuel due to a cracking and healing process, mass transport of fuel from the inside to the outside of the fuel column, and fuel clad interference occurring during reactor shutdown and subsequent removal of the pin from the reactor.
