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
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
June 2025
Nuclear Technology
Fusion Science and Technology
May 2025
Latest News
Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
Charles D. Scott
Nuclear Science and Engineering | Volume 34 | Number 3 | December 1968 | Pages 214-223
Technical Paper | doi.org/10.13182/NSE68-A21087
Articles are hosted by Taylor and Francis Online.
The cosorption of water and carbon dioxide by molecular sieves is a potential method of removing these contaminants from the helium coolant of a nuclear gas cooled reactor. This system was experimentally investigated by both differential- and deep-bed tests at a temperature of 25°C; at pressures of 1 to 30 atm for differential tests and 10 to 30 atm for deep-bed tests; with gas flow rates of 0.0010 to 0.0138 g/(cm2 sec); and with inlet water or carbon dioxide concentrations of 3.4 × 10−8 to 9.3 × 10−7 g moles/cm3. These tests showed that the system could be described by the rate limiting step of intracrystalline diffusion with diffusion coefficients at 25°C of 1.92 × 10−10 cm2/sec for water and 3.11 × 10−10 cm2/sec for CO2. Sorbed CO2 was found to be irreversibly replaced by sorbed water, and the CO2 loading was dependent on water concentration. Differential equations were derived to describe the system of the cosorption of two interacting fluid species with Freundlich-type isotherms in a flowing fluid by a fixed bed of solids in which the sorption rate is controlled by intracrystalline diffusion. The set of differential equations was solved by a finite difference method for the case of water and carbon dioxide cosorption by molecular sieves. Generalized breakthrough curves for both water and CO2 were determined, and their use for design purposes is demonstrated.