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Division Spotlight
Mathematics & Computation
Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
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!
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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.
DeeEarl Vaden
Nuclear Technology | Volume 88 | Number 3 | December 1989 | Pages 325-331
Technical Paper | Technique | doi.org/10.13182/NT89-A34315
Articles are hosted by Taylor and Francis Online.
The hydrogen meter leak detectors at the Experimental Breeder Reactor II (EBR-II) are periodically checked with a vacuum ionization gauge to see if the leak detectors are calibrated. The gauge, which measures equilibrium pressure, requires an equation to convert the gauge pressure to the hydrogen concentration in sodium. The original equationH, ppm = 10.30 * (Pg, Torr)1/2 is derived from Sievert’s law with adjustments for gauge sensitivity to hydrogen and thermal transpiration effects. EBR-II experience has shown that the Sievert’s law equation has not been reliable in accurately determining the hydrogen concentration in sodium. It is also difficult to determine the hydrogen gauge sensitivity, which can change with time. EBR-II has developed a new equation over a hydrogen range of 0.063 to 0.230 ppm,H, ppm = 0.016 + 10.10 * (Pg, Torr)1/2 , by using a frit-type plugging meter to determine the hydrogen concentration when an equilibrium pressure measurement is done. With sodium hydride as the predominant impurity, the impurity saturation temperature (plugging temperature) measured with the plugging meter can be used to calculate the hydrogen concentration. Measuring the equilibrium gauge pressure and plugging temperature at various hydrogen impurity levels provides the data to accurately calibrate the vacuum ionization gauge without measuring or estimating the gauge sensitivity, gauge temperature, or Sievert’s law constant.
