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
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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October 2024
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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.
Gerald S. Lellouche
Nuclear Science and Engineering | Volume 24 | Number 1 | January 1966 | Pages 72-76
Technical Paper | doi.org/10.13182/NSE66-A18125
Articles are hosted by Taylor and Francis Online.
It is shown that it is possible to recast the usual canonical conditions for predicting stability-in-the-large for reactor-kinetics systems into terms of the parameters characteristic of the physical system, thus permitting direct qualitative examination of the stability of a given system. For systems with more than one reactivity coefficient, it is found as a direct consequence of the physical formulation that if the prompt coefficient is negative then a delayed positive coefficient can be more stabilizing than a delayed negative coefficient.