ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
2026 Nuclear Energy Conference & Expo (NECX)
August 24–27, 2026
Dallas, TX|Hilton Anatole
Latest Magazine Issues
Jun 2026
Jan 2026
2026
Latest Journal Issues
Nuclear Science and Engineering
July 2026
Nuclear Technology
Fusion Science and Technology
Latest News
Valar’s Ward 250 reaches criticality in Utah
El Segundo, Calif.–based start-up Valar Atomics has taken its Ward 250 test reactor critical at the Utah San Rafael Energy Lab (USREL), becoming the second company in the Department of Energy's Reactor Pilot Program to reach the milestone, and, according to the DOE, the first to do so outside a national laboratory.
The DOE celebrated the achievement in a June 18 announcement, describing it as a "zero-power fueled criticality demonstration." The news follows a similar update for Antares Nuclear's Mark-0 reactor, which the DOE said achieved criticality at Idaho National Laboratory earlier this month.
1:00–2:45PM PDT
Palm A
Session Chair: Matthew R. Denman|Alternate Chair: Koroush Shirvan
Palm B
Session Chair: Matthew D. Bucknor|Alternate Chair: Koroush Shirvan
3:15–5:00PM PDT
Panel|Palm A
Session Chair: David S. Grabaskas|Alternate Chair: Matthew D. Bucknor
Panel|Palm B
10:00–11:45AM PDT
Session Chair: Dennis W. Henneke|Alternate Chair: Aslak Stubsgaard
Session Chair: Matthew R. Denman|Alternate Chair: David S. Grabaskas
Session Chair: David Grabaskas|Alternate Chair: Matthew R. Denman
Session Chair: Aslak Stubsgaard|Alternate Chair: David S. Grabaskas
Session Chair: Matthew Denman|Alternate Chair: Aslak Stubsgaard
Session Chair: Dennis Henneke|Alternate Chair: David S. Grabaskas
Session Chair: Aslak Stubsgaard|Alternate Chair: Mihai A. Diaconeasa
Session Chair: Dennis W. Henneke|Alternate Chair: Mihai A. Diaconeasa
Session Chair: Koroush Shirvan|Alternate Chair: David S. Grabaskas
Session Chair: Robert W. Youngblood|Alternate Chair: Mihai A. Diaconeasa
Session Chair: Robert W. Youngblood|Alternate Chair: Dennis W. Henneke