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
August 2025
Nuclear Technology
Fusion Science and Technology
Latest News
ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
C. Ronchi, J. Sakellaridis, C. Syros
Nuclear Science and Engineering | Volume 95 | Number 4 | April 1987 | Pages 282-295
Technical Paper | doi.org/10.13182/NSE87-A20439
Articles are hosted by Taylor and Francis Online.
The diffusion equation for volatile radioactive fission products in sintered nuclear fuels is investigated. All known effects that may affect the rate of diffusion to the grain boundaries are taken into account: simultaneous diffusion of the radioactive precursors, radioactive decay, sink trapping, and radiation resolution. Starting from the analysis of the spatial transport equation, an expression for the boundary loss term to be used in the simpler reaction rate equation is deduced. For practical applications the boundary loss term in the absence of resolution effects can reasonably be assumed to be independent of time. This is not generally true if resolution effects are present; in this case the release calculations become more complex than it was assumed so far. Finally, a discussion on the properties of the boundary loss term as functions of the physical parameters involved follows, and details of the calculations are presented.