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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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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. H. Kittel, S. H. Paine
Nuclear Science and Engineering | Volume 3 | Number 3 | March 1958 | Pages 250-268
Technical Paper | doi.org/10.13182/NSE58-A25465
Articles are hosted by Taylor and Francis Online.
Results are given from experiments in which unrestrained specimens of unalloyed natural uranium were irradiated to total atom burnups ranging up to 1.82% (15,500 Mwd/T) at temperatures from 50° to 220°C. A few specimens were also thermally cycled. The specimens represented material with four different fabrication histories: (1) rolled at 300°C, (2) rolled at 300°C and quenched from the beta phase, (3) rolled at 300°C, quenched from the beta phase, and recrystallized in the alpha phase, and (4) rolled at 600°C. It was found that the 300°C rolled specimens in the as-rolled condition grew in length at a rapid rate when subjected to irradiation, although they maintained relatively smooth surfaces. The growth rate of this material appeared to decrease with increasing irradiation temperature. The beta-quenched specimens were much more stable dimensionally but developed roughened surfaces. The 600°C rolled material showed intermediate behavior. It was concluded that 300°C rolled and beta-quenched uranium can withstand at least 2 atomic per cent burnup without disintegration due to irradiation damage. A qualitative similarity was found between the irradiation growth rates of the four materials and their growth rates under thermal cycling.