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
Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
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.
S. Sanatani, L. S. Kothari
Nuclear Science and Engineering | Volume 11 | Number 2 | October 1961 | Pages 211-217
Technical Paper | doi.org/10.13182/NSE61-A28066
Articles are hosted by Taylor and Francis Online.
To study the diffusion of thermal neutrons in a solid medium, we divide the neutron energy range into two groups, one above and another below the Bragg cutoff energy for the medium. We then apply the method of groups to study the problem. As examples we have considered infinite slabs of beryllium at temperatures of 100°K and 300°K, with an infinite plane source of neutrons at one end of the slab. The flux distributions and the mean neutron energy are calculated for the different cases. It is found that, while for beryllium at 300°K the mean energy is not very much different from the Maxwellian value, for beryllium at T = 100°K results are markedly different from those for a Maxwellian distribution at that temperature. In order to emphasize the effect of the interaction between the two groups in determining the equilibrium flux distributions, we have also made calculation neglecting the interaction and compared these with the earlier results which take account of the interaction.