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Mathematics & Computation
Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
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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July 2025
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High-temperature plumbing and advanced reactors
The use of nuclear fission power and its role in impacting climate change is hotly debated. Fission advocates argue that short-term solutions would involve the rapid deployment of Gen III+ nuclear reactors, like Vogtle-3 and -4, while long-term climate change impact would rely on the creation and implementation of Gen IV reactors, “inherently safe” reactors that use passive laws of physics and chemistry rather than active controls such as valves and pumps to operate safely. While Gen IV reactors vary in many ways, one thing unites nearly all of them: the use of exotic, high-temperature coolants. These fluids, like molten salts and liquid metals, can enable reactor engineers to design much safer nuclear reactors—ultimately because the boiling point of each fluid is extremely high. Fluids that remain liquid over large temperature ranges can provide good heat transfer through many demanding conditions, all with minimal pressurization. Although the most apparent use for these fluids is advanced fission power, they have the potential to be applied to other power generation sources such as fusion, thermal storage, solar, or high-temperature process heat.1–3
Rasito Tursinah, Sidik Permana, Zaki Su’ud, Alan Maulana, Putu Sukmabuana
Nuclear Technology | Volume 211 | Number 4 | April 2025 | Pages 635-644
Review Article | doi.org/10.1080/00295450.2024.2361177
Articles are hosted by Taylor and Francis Online.
The single-moderator neutron spectrometer is the result of developments in multisphere neutron spectrometer design. Multisphere is a multimoderator-based neutron spectrometer technique to measure the neutron spectrum with the most comprehensive energy range from electron-volt to gigaelectron-volt. Developing a multisphere into a single moderator aims to obtain a more practical device with regard to mobility and measurement techniques. We also review the layered-moderator design, a multisphere development with a single detector.
This paper ends with a review of the development of single-moderator designs with multidetectors, with regard to the various forms of moderators, types of detectors used, and validation results of each model. The development of the single-moderator neutron spectrometer in the geometric aspect of the moderator produces two dominant moderator shapes: spherical and cylindrical. The spherical shape is applied to measure the multidirectional neutron beam, while the cylindrical shape is used for the monodirectional beam. Validation results of 2.5% to 3.2% on single-sphere designs and 2% to 8% on single-cylindrical designs indicate that the developed single-moderate neutron spectrometer designs can replace multisphere-type spectrometers.
