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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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
November 2025
Nuclear Technology
October 2025
Fusion Science and Technology
Latest News
Radiant to build first microreactor at Tenn. Manhattan Project site
Radiant Industries will build its first portable nuclear reactor at the site of the Manhattan Project in Oak Ridge, Tenn.
The land for Radiant’s new factory includes portions of the K-27 and K-29 Manhattan Project sites. The company plans to test Kaleidos, a 1-MW nuclear microreactor, in 2026, with first deployments expected soon after.
Nuclear and Emerging Technologies for Space (NETS-2022) Plenary SPeaker
Tactical Technology Office (TTO)
Program Manager
DARPA
Maj. Nathan Greiner joined DARPA in July 2018 as a program manager in the Tactical Technology Office. His research interests include advanced power and propulsion technologies for land, sea, air, and space applications.
Before joining DARPA, Maj. Greiner completed a one-year fellowship at the Oak Ridge National Laboratory in Oak Ridge, Tennessee, where he focused on materials research. Previously, he served as a deputy branch chief and hypersonics research engineer in the U.S. Air Force Research Laboratory’s Aerospace Systems Directorate at Wright-Patterson Air Force Base, Ohio. He also has held positions as a liaison officer with U.S. Special Operations Command at Camp Lemonnier, Djibouti, and program manager for U.S. Special Operations Command at MacDill Air Force Base, Florida.
Maj. Greiner holds a Doctor of Philosophy in aeronautical engineering from the Air Force Institute of Technology, a Master of Science in mechanical engineering from the University of Utah, and a Bachelor of Science in mechanical engineering from the University of St. Thomas in St. Paul, Minnesota.
Last modified April 27, 2022, 4:36pm EDT
