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 Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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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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.
W. Häfele, L. Dresner
Nuclear Science and Engineering | Volume 7 | Number 4 | April 1960 | Pages 304-312
Technical Paper | doi.org/10.13182/NSE60-A25721
Articles are hosted by Taylor and Francis Online.
The flux distribution of a pulsed neutron experiment is expanded in terms of eigenfunctions with respect to both energy and space. The diffusion cooling constant is given exactly in terms of matrix elements with respect to these eigenfunctions. These matrix elements are evaluated for the special case of a heavy gas moderator. It is also possible to develop the theory for heterogeneous assemblies. The interaction of the cell and the assembly buckling in these structures is described and the diffusion cooling effect is considered. In addition to the normal diffusion cooling effect, a second cooling effect appears which is due to the neutrons which diffuse into the lumped absorbers.
