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
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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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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|Panels
Wednesday, April 24, 2024|10:15AM–12:00PM PDT|Imperial Ballroom
Session Chair:
Samuel E. Bays
Session Organizer:
Alternate Chair:
Massimiliano Fratoni
This panel will discuss topics related to the initial test program for first-of-a-kind (FOAK) advanced reactors. Dr. Sam Bays will provide a historical overview of past advanced reactor test programs as documented in his team's report, "Startup Physics Testing of Advanced Reactors - A Historical Review". Dr. Bays and Dr. Abe Weitzberg have co-chaired the ANS working group, Initial Fuel Loading and Startup Physics Tests for FOAK Advanced Reactors, ANS-19.13. Current findings of ANS-19.13 will be discussed. Dr. Nader Satvat of Kairos Power will be providing an overview of current test plans for the HERMES reactor. Mr. Mike Prible of Westinghouse will provide his perspectives leading the startup physics testing of AP1000 pressurized water reactors.
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