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
Sep 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
August 2025
Latest News
New consortium to address industry need for nuclear heat and power
Hoping to tackle a growing global demand for energy, The Open Group, a vendor-neutral technology and standards membership organization, has announced the formation of the Industrial Advanced Nuclear Consortium (IANC) to collaborate on finding advanced nuclear energy solutions to serve industrial customers.
J. M. Kallfelz, G. B. Bruna, G. Palmiotti, M. Salvatores
Nuclear Science and Engineering | Volume 62 | Number 2 | February 1977 | Pages 304-309
Technical Note | doi.org/10.13182/NSE77-A26966
Articles are hosted by Taylor and Francis Online.
The application of generalized perturbation theory, both time dependent and static, to burnup problems is discussed. Simple analytical forms, applicable for many cases of interest, are derived for the time-dependent expressions. The influence of changes in Φ(E,r) during the cycle on the production of the plutonium isotopes is calculated for a typical liquid-metal fast breeder reactor case, using perturbation theory. Comparison of the results with direct calculations indicates that perturbation theory gives satisfactory accuracy for this problem.