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
Aug 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
August 2025
Latest News
Powering the future: How the DOE is fueling nuclear fuel cycle research and development
As global interest in nuclear energy surges, the United States must remain at the forefront of research and development to ensure national energy security, advance nuclear technologies, and promote international cooperation on safety and nonproliferation. A crucial step in achieving this is analyzing how funding and resources are allocated to better understand how to direct future research and development. The Department of Energy has spearheaded this effort by funding hundreds of research projects across the country through the Nuclear Energy University Program (NEUP). This initiative has empowered dozens of universities to collaborate toward a nuclear-friendly future.
Moon H. Chang, Kap S. Moon, Jae M. Noh, Si H. Kim
Nuclear Science and Engineering | Volume 103 | Number 4 | December 1989 | Pages 343-350
Technical Paper | doi.org/10.13182/NSE89-A23687
Articles are hosted by Taylor and Francis Online.
The behavior of neutron leakages between nodes is in general spatially coupled and environment dependent. To investigate this phenomenon, a new transverse leakage model characterized by the space-dependent neutron flux expanded into spatially nonseparable polynomials has been developed. The new transverse leakage model incorporated into the nodal expansion method was tested for its accuracy and applicability by performing benchmark problems and applied to a realistic pressurized water reactor core, beginning of cycle 1 of Korea Nuclear Unit 1. The results obtained for homogeneous nodal problems with the explicit representation of the baffle and water reflector show that the new method improves the reactor core physics parameters, and that it improves the nodal power distribution of the conventional models more than a factor of 2, especially in the fuel regions next to the core baffle where the material discontinuity is predominant due to the significant difference in the neutron spectrum.