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.
Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
June 2025
Nuclear Technology
May 2025
Fusion Science and Technology
Latest News
Sam Altman steps down as Oklo board chair
Advanced nuclear company Oklo Inc. has new leadership for its board of directors as billionaire Sam Altman is stepping down from the position he has held since 2015. The move is meant to open new partnership opportunities with OpenAI, where Altman is CEO, and other artificial intelligence companies.
Donald Hoffman is the current president and CEO of EXCEL Services Corporation. He founded EXCEL Services Corporation in 1985 to provide specialized professional services to nuclear utilities in licensing, regulatory support, and operational areas.
Hoffman is very active in the nuclear industry and served as the 59th president of the American Nuclear Society. He is the Chair of the Virginia Nuclear Energy Consortium Authority which is charged with the responsibility for making the Commonwealth a national and global leader in nuclear energy and to serve as an interdisciplinary study, research, and information resource for the Commonwealth on nuclear issues. He is the Co-Chair of the ANS Special Committee on Nuclear in the States which shall identify and review: state and regional-opportunities for new nuclear development in the US; state-level legislative and regulatory barriers preventing such development; federal policies that have a direct impact on state level decision-making; lessons learned from the new nuclear development projects currently under construction, and determine the best course forward. He is also the president of Eagle Alliance, a U.S. based grassroots organization that represents all facets of nuclear science and technology.
Prior to starting EXCEL, Hoffman served in the U.S. Nuclear Submarine Navy as a senior reactor operator and engineering officer. He was a branch chief and a lead reviewer at the Nuclear Regulatory Commission reviewing license applications and technical specifications.
Hoffman has been a member of ANS since 1984, has served on the Board of Directors, and has been an active member of many divisions and committees.
He received his degree in Nuclear Engineering and Technology in 2010 from Excelsior College in New York.
He continues to make presentations and provide testimony regarding the benefits of nuclear science and technology to the U.S. Congress, the U.S. Governors, the National Governors Association, and other U.S. organizations.
Read Nuclear News from July 2013 for more on Don.
Last modified October 17, 2018, 2:31pm CDT
