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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.
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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!
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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.
Josef Schaefer, Detlev Stöver, Rudolf Hecker
Nuclear Technology | Volume 66 | Number 3 | September 1984 | Pages 537-549
F. Hydrogen and Tritium Permeation | Status of Metallic Materials Development for Application in Advanced High-Temperature Gas-Cooled Reactor / Material | doi.org/10.13182/NT84-A33476
Articles are hosted by Taylor and Francis Online.
The phenomenon of hydrogen permeation through high-temperature alloys has been recognized as an important problem in developing nuclear energy production systems. Investigations are concerned with experimental techniques and requirements to conform with the concept of practical development. After establishing the data of hydrogen permeation through bare alloys, efforts are directed toward investigating the permeation behavior of surface oxidized walls. In this way 12 alloy types are examined under various conditions. The reduced penetration occurring under “process gas” atmosphere is determined by the “impeding factor”: It is the ratio of permeation rates measured under special conditions in the case of bare alloy annealed in pure hydrogen and in the case of its oxidized surface. One influence on the permeation behavior is proceeding from the metallic substrate of oxide coating: Centricast and wrought types of alloys are effective in different ways. Varied treatment before coating was significant only in the case of annealing in hydrogen. Most influential is the temperature acting upon both the permeating and the coating quality in a compensating manner. Temperature cycling in oxidizing atmosphere points to improved impeding. The relationship between the oxidation potential and the impeding conditions is not yet clear. In the temperature range between 650 and 900°C, a square root behavior below ∼5-bar hydrogen pressure is dominant, whereas a linear pressure dependence was detected above. A crossover range is obvious, especially distinct at higher temperatures. The influence of chromium oxide in the corrosion cover is manifested by metallurgical postexamination results corresponding with permeation data of selected samples.