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.
Division Spotlight
Fusion Energy
This division promotes the development and timely introduction of fusion energy as a sustainable energy source with favorable economic, environmental, and safety attributes. The division cooperates with other organizations on common issues of multidisciplinary fusion science and technology, conducts professional meetings, and disseminates technical information in support of these goals. Members focus on the assessment and resolution of critical developmental issues for practical fusion energy applications.
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!
Latest Magazine Issues
Aug 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
October 2024
Nuclear Technology
Fusion Science and Technology
August 2024
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.
T. E. Murley, I. Kaplan
Nuclear Science and Engineering | Volume 31 | Number 2 | February 1968 | Pages 207-214
Technical Paper | doi.org/10.13182/NSE68-A18232
Articles are hosted by Taylor and Francis Online.
A method is presented for calculating the energy spectrum of fission neutrons slowing down in a homogeneous medium of arbitrary composition. The integral equation for ø(E) is solved by an iterative method, yielding a sum of partial spectra which are then summed to obtain a very simple expression for the slowing down spectrum. The effects of absorption and inelastic scattering are accounted for in an approximate manner. The fundamental-mode spectrum for a typical fast-reactor composition was calculated by this method, and the results agree favorably with the central spectrum from a 26-group diffusion calculation. A further application is given for using this method to generate weighting spectra for computing average multigroup cross sections.