ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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.
Technical Session|Panel|Sponsored by NISD
Monday, June 14, 2021|3:15–5:00PM EDT
Session Chair:
David S. Grabaskas
Alternate Chair:
Matthew R. Denman
Session Organizer:
Andrew J. Clark
Staff Producer:
Julie Bry (ANS)
The ANSI/ASME/ANS "Probabilistic Risk Assessment Standard for Advanced Non-Light Water Reactor Nuclear Power Plants" was approved and published January 28, 2021. The development of the Non-LWR PRA Standard encountered many technical issues that the working group overcame, such as: database development for the 1,500+ requirements; combining PRA elements from multiple PRA standards into one comprehensive PRA standard; formation of absolute importance measures and screening criteria; and appropriate language to allow PRA applications over the entire design/operation life cycle. This panel will discuss these technical issues and the lessons learned from the development of the Non-LWR PRA Standard.
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