ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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!
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Latest News
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
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.