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
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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.
M. M. R. Williams
Nuclear Science and Engineering | Volume 30 | Number 2 | November 1967 | Pages 188-198
Technical Paper | doi.org/10.13182/NSE67-A17330
Articles are hosted by Taylor and Francis Online.
A formalism based upon the source-sink method of Horning, Feinberg, and Galanin has been developed which predicts the neutron noise spectrum, and time-dependent correlation function, in heterogeneous reactor systems. The method is applied to two problems in infinite plane geometry: the infinite lattice, and detector perturbations. In the lattice problem, it is shown that the simple, homogeneous theory will only be valid when the lattice spacing is very much less than the attenuation length of a neutron wave in the pure moderator. The flux depression in the neighborhood of a neutron detector is found to introduce significant corrections to the noise spectrum.