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.
J. Schlösser
Nuclear Science and Engineering | Volume 24 | Number 2 | February 1966 | Pages 123-132
Technical Paper | doi.org/10.13182/NSE66-A18297
Articles are hosted by Taylor and Francis Online.
A model of parallel capillaries with different diameters has been developed to explain back-diffusion experiments on four rather different graphites both impregnated and unimpregnated. The transport phenomenon has been taken as an interaction between diffusional and molecular flow on one hand, and viscous and slip flow on the other, to cover the whole range of diameter to mean-free-path ratios possible in graphite. It can be shown that only by assuming at least three bundles of capillaries with different diameters can these experiments be adequately explained. It is further possible to relate the material constants, the viscous flow component B0, and the slip flow component K0 to the pore-size distribution obtained. When we consider the complexity of porous capillaries in graphite, the agreement is found to be good, about 30%.