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Division Spotlight
Young Members Group
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.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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Latest News
BWXT will scout potential TRISO fuel production sites in Wyoming
BWX Technologies Inc. announced today that its Advanced Technologies subsidiary has signed a cooperation agreement with the state of Wyoming to evaluate locations and requirements for siting a potential new TRISO nuclear fuel fabrication facility in the state.
D. R. Vissers, J. T. Holmes, L. G. Bartholme, P. A. Nelson
Nuclear Technology | Volume 21 | Number 3 | March 1974 | Pages 235-244
Technical Paper | Instrument | doi.org/10.13182/NT74-A31394
Articles are hosted by Taylor and Francis Online.
A diffusion-type hydrogen-activity meter has been developed at Argonne National Laboratory to measure the hydrogen level of the sodium coolant in Liquid Metal Fast Breeder Reactor systems. The meter can be operated in two modes: an equilibrium mode and a dynamic mode. In the equilibrium mode, the hydrogen pressure in equilibrium with the sodium is measured by a pressure sensor and is related to the hydrogen concentration in the sodium by the Sieverts’ law constant for the hydrogen-sodium system. In the dynamic mode, the hydrogen concentration in sodium is measured by the rate of hydrogen diffusion through a nickel membrane immersed in the sodium. A vacuum of 10−6 to 10−8 Torr is drawn on the membrane at a steady rate by an ion pump, and the hydrogen activity gradient from the sodium side to the vacuum side of the membrane causes hydrogen to diffuse through the membrane. The partial pressure of hydrogen on the vacuum side, a measure of the hydrogen flux and hydrogen activity in the sodium, is determined by measuring the current to the ion pump. The meter is unique in that it does not require any form of external calibration. Data were obtained in this study of the Sieverts’ constant and hydrogen solubility for the range of 0.03 to 1 ppm. The Sieverts’ constant is slightly affected by temperature over the range 370 to 500° C and is given by The solubility of hydrogen in sodium for 0.03 to 70 ppm (including the data of others) is given by