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
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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.
H. Aisu
Nuclear Science and Engineering | Volume 21 | Number 2 | February 1965 | Pages 250-256
Technical Paper | doi.org/10.13182/NSE65-A21049
Articles are hosted by Taylor and Francis Online.
The analytical expression for the effective resonance integral of a tubular absorber filled with moderator is obtained for the non-Doppler-broadened situation using the first collision probabilities for tubular geometry and is compared with the simpler expression by Carlvik and Pershagen. The effect of neutron transparency of the fuel on the resonance integral is shown to be important for a thin fuel region, and the correction factor in the calculation of the effective surface is given for the non-Doppler-broadened situation. The effect of Doppler broadening is examined in a simple manner. A correction factor lower than 0.8 is plausible for uranium oxide and metal tubes in the practical problems.
