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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
2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott 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
June 2025
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Latest News
AI and productivity growth
Craig Piercycpiercy@ans.org
This month’s issue of Nuclear News focuses on supply and demand. The “supply” part of the story highlights nuclear’s continued success in providing electricity to the grid more than 90 percent of the time, while the “demand” part explores the seemingly insatiable appetite of hyperscale data centers for steady, carbon-free energy.
Technically, we are in the second year of our AI epiphany, the collective realization that Big Tech’s energy demands are so large that they cannot be met without a historic build-out of new generation capacity. Yet the enormity of it all still seems hard to grasp.
or the better part of two decades, U.S. electricity demand has been flat. Sure, we’ve seen annual fluctuations that correlate with weather patterns and the overall domestic economic performance, but the gigawatt-hours of electricity America consumed in 2021 are almost identical to our 2007 numbers.
François Martin, André Bergeron, Guillaume Campioni, Yannick Gorsse, Nathan Greiner, Elsa Merle
Nuclear Science and Engineering | Volume 199 | Number 1 | April 2025 | Pages S994-S1005
Research Article | doi.org/10.1080/00295639.2024.2328964
Articles are hosted by Taylor and Francis Online.
The CEA multiphysics tool combining the deterministic neutronics code APOLLO3® and the computational fluid dynamics (CFD) platform TRUST/TrioCFD is used to model the first-ever-built molten salt nuclear reactor, the Aircraft Reactor Experiment (ARE). A neutronics model and a thermal-hydraulic model of the reactor were created and coupled. Steady-state and transient simulations were performed in order to reproduce experiments realized on the ARE. The simulation results and experimental data are compared as a way of validating the multiphysics tool. The nominal state of the ARE is reproduced first; significant discrepancies were observed regarding the liquid sodium flow. Variations of βeff with the fuel flow rate were then studied. While the simulation was in very good agreement with the experimental data for high flow rates, some discrepancies were observed at low and null flow rates. Finally, a transient simulation of a rod withdrawal was reproduced. While the beginning of the transient simulation was in good agreement with the experimental data, oscillations appeared in the second half of the simulation.
