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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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.
Yukio Sakamoto, Shun-ichi Tanaka, Yoshiko Harima
Nuclear Science and Engineering | Volume 100 | Number 1 | September 1988 | Pages 33-42
Technical Paper | doi.org/10.13182/NSE88-A29012
Articles are hosted by Taylor and Francis Online.
The values of buildup factors for a specific energy above K edges and penetration distance vary smoothly with respect to atomic number. An interpolation of buildup factors for an arbitrary elemental material is examined using geometric-progression (G-P) parameters for an equivalent atomic number. The G-P parameters are data fitted to the proposed American National Standard buildup factor data compilation of 17 elements from beryllium to molybdenum and are calculated by the moments method. The data for iron, molybdenum, tin, lanthanum, gadolinium, tungsten, lead, and uranium, including bremsstrahlung and fluorescence, are calculated by the PALLAS code. Various tests over a wide range of atomic numbers confirm that values of the buildup factors generated by interpolated G-P parameters can reproduce the basic data calculated directly over the full range of energy with an accuracy within a few percent. The values of equivalent atomic number for mixture materials, such as water, air, concrete, and lead glass of 4.36 density, are determined from a ratio of scattering cross section to the total attenuation coefficient. The buildup factors for these materials calculated using the G-P parameters, interpolated by the equivalent atomic number, are in good agreement with the basic data, although a deviation is observed above 3 MeV for the buildup factors for lead glass.