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The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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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First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Kenji Kikuchi, Hideo Kaburaki, Konomo Sanokawa, Katsuyuki Kawaguchi, Masaaki Nemoto, Shintaro Watanabe
Nuclear Technology | Volume 66 | Number 3 | September 1984 | Pages 491-502
E. Friction and Wear | Status of Metallic Materials Development for Application in Advanced High-Temperature Gas-Cooled Reactor / Material | doi.org/10.13182/NT84-A33471
Articles are hosted by Taylor and Francis Online.
In a very high temperature gas-cooled reactor developed at the Japan Atomic Energy Research Institute, reactor components, such as heat transfer tubes (Hastelloy-XR) of an intermediate heat exchanger, hot duct liners (Hastelloy-XR), core support plates ( Cr-1 Mo steel), control rod sheaths (Hastelloy-XR), orifice devices (SUS 304), fuel blocks (graphite), and others, are exposed to helium gas coolant with a temperature of 1000°C and a pressure of 4.1 MPa. The relative sliding movements of the structure, which are stimulated by flow-induced vibration, constraint force, and thermal expansion, might cause unfavorable friction and wear. Sliding wear tests were carried out on PGX graphite, Cr-1 Mo steel, and heat- and corrosion-resistant Hastelloy-XR in 500 to 1000°C. Environmental helium gas pressures of 0.2 and 4.1 MPa were chosen to compare the influence of the pressures. The effects of four different impurity gases (O2, H2, H2O, and CH4) on tribological behavior were studied, each gas concentration being varied up to ∼103 ppm. The specimen was a hemisphere-on-plate type, the plate being oscillated with a 5-Hz frequency and a 0.5-mm amplitude under a 9.8-N contacting load. The test duration was 3 h. In the case of Hastelloy-XR against itself, wear was adhesive in general, but the friction coefficient decreased to ∼0.3 in the environment with high-O2 concentration, and a relatively thick oxide film was found on the sliding surface. The results of calorized Hastelloy-XR against PGX graphite showed little dependence on impurity gas, and a lower value friction coefficient of ∼0.1 was obtained. In Cr-1 Mo steel against PGX graphite, thin layers of Fe2O3 and/or Fe3O4 were formed on the metal surfaces in the environment containing O2, and the friction coefficient gradually increased with high-O2 concentration. The case of PGX graphite against itself gave a low friction coefficient of ∼0.1 in the environment of high-O2 concentration, whereas in other impurity gases the value was ∼0.4.
