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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
Meeting 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!
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Take steps on SNF and HLW disposal
Matt Bowen
With a new administration and Congress, it is time once again to ponder what will happen—if anything—on U.S. spent nuclear fuel and high-level waste management policy over the next few years. One element of the forthcoming discussion seems clear: The executive and legislative branches are eager to talk about recycling commercial SNF. Whatever the merits of doing so, it does not obviate the need for one or more facilities for disposal of remaining long-lived radionuclides. For that reason, making progress on U.S. disposal capabilities remains urgent, lest the associated radionuclide inventories simply be left for future generations to deal with.
In March, Rick Perry, who was secretary of energy during President Trump’s first administration, observed that during his tenure at the Department of Energy it became clear to him that any plan to move SNF “required some practical consent of the receiving state and local community.”1
Vladimir Kogan, Philip M. Schumacher
Nuclear Technology | Volume 161 | Number 2 | February 2008 | Pages 190-202
Technical Note | Miscellaneous | doi.org/10.13182/NT08-A3922
Articles are hosted by Taylor and Francis Online.
This paper summarizes the results of an independent review of information from the available literature on plutonium release parameters obtained in worldwide studies on accidental fires that might occur in nuclear facilities and generates technically justifiable recommendations on plutonium releases based on this review. This work was limited to the accidental fires in nuclear facilities involving plutonium-contaminated waste materials that can be in either solid or liquid form, as well as involving plutonium metal itself. Releases of plutonium are expressed in terms of the airborne release fraction (ARF), defined as the total fraction of initial material released in the accident, or the airborne release rate, which is the average rate at which ARF is released for the duration of the accident. Respirable fraction of the mass of plutonium dispersed in the air is conditionally assumed to include particles having aerodynamic diameters smaller than 10 m (aerodynamic diameter of a particle is defined as the diameter of a unit density sphere having the same aerodynamic properties as the particle; particles of any shape or density will have the same aerodynamic diameter if their settling velocity is the same). For intense fires in solid waste storage areas or large explosions associated with plutonium metal, up to 50% of the plutonium contamination may be released as respirable aerosol.
