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
July 2025
Latest News
DOE on track to deliver high-burnup SNF to Idaho by 2027
The Department of Energy said it anticipated delivering a research cask of high-burnup spent nuclear fuel from Dominion Energy’s North Anna nuclear power plant in Virginia to Idaho National Laboratory by fall 2027. The planned shipment is part of the High Burnup Dry Storage Research Project being conducted by the DOE with the Electric Power Research Institute.
As preparations continue, the DOE said it is working closely with federal agencies as well as tribal and state governments along potential transportation routes to ensure safety, transparency, and readiness every step of the way.
Watch the DOE’s latest video outlining the project here.
Weston M. Stacey, Jr.
Nuclear Science and Engineering | Volume 45 | Number 2 | August 1971 | Pages 189-198
Technical Paper | doi.org/10.13182/NSE71-A20885
Articles are hosted by Taylor and Francis Online.
A method is described for solving the energy-dependent neutron diffusion equation by first factorizing the flux into a spatial shape function with weak energy dependence and a spectral function, then developing coupled equations for these two functions which must be solved iteratively. Numerical procedures used to solve these equations combine internally, and in a self-consistent fashion, a fine-group spectrum calculation with a broad-group spatial calculation. Numerical examples, based on representative fast-reactor models, are presented to demonstrate that this space-energy factorization method constitutes an accurate and economical approximation.