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
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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!
Latest Magazine Issues
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Deep geologic repository progress—2025 Update
Editor's note: This article has was originally published in November 2023. It has been updated with new information as of June 2025.
Outside my office, there is a display case filled with rock samples from all over the world. It contains a disk of translucent, orange salt from the Waste Isolation Pilot Plant near Carlsbad, N.M.; a core of white-and-bronze gneiss from the site of the future deep geologic repository in Eurajoki, Finland; several angular chunks of fine-grained, gray claystone from the underground research laboratory at Bure, France; and a piece of coarse-grained granite from the underground research tunnel in Daejeon, South Korea.
19th International Conference on Probabilistic Safety Assessment and Analysis (PSA 2025)
Dr. Matthew Denman is a Distinguished Engineer in Kairos Power’s Modeling and Simulation group. Matt was the responsible engineer for the first Nuclear Regulatory Commission (NRC) approved non-light water reactor mechanistic source term topical report. He was also responsible for the development and execution of the Maximum Hypothetical Accident analysis which supported the construction permit applications of the Hermes and Hermes 2 reactors. Matt is currently responsible for the execution of radiological source term postulated event analysis supporting operating license applications for the Hermes reactors. Prior to joining Kairos Power in 2019, Matt worked at Sandia National Laboratories where he supported various probabilistic risk assessment and advanced reactor licensing activities for both the NRC and Department of Energy.
Matt has a PhD in Nuclear Engineering from MIT in 2011 and a BS in Nuclear Engineering from the University of Florida in 2007. He is a long-time member of the American Nuclear Society and received the David Okrent Award for Nuclear Safety from the Nuclear Installation Safety Division in 2021. Matt was the Program Committee Chair for the inaugural Advanced Reactor Safety (ARS) conference in 2024 and is the General Chair for the second ARS conference in 2026.
Last modified June 5, 2025, 1:17pm CDT