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).”
Jose March-Leuba, Dan G. Cacuci, Rafael B. Perez
Nuclear Science and Engineering | Volume 86 | Number 4 | April 1984 | Pages 401-404
Technical Note | doi.org/10.13182/NSE84-A18640
Articles are hosted by Taylor and Francis Online.
When a heat transfer coefficient is varied in a lumped-parameter model of a nuclear reactor, the model can undergo period-doubling pitchfork bifurcations leading to aperiodic behavior. Until aperiodicity commences, the model behaves in the universal manner predicted by Feigenbaum, and the Poincaré map for the excess neutron population behaves as a typical one-dimensional map with a quadratic maximum. In the aperiodic region, though, this Poincaré map displays a hysteresis-like folding. At all times, the model's dynamic evolution remains bounded.