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Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
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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
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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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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.
Ralf-Dieter Penzhorn, Uwe Berndt, Erhard Kirste, Jacqueline Chabot
Fusion Science and Technology | Volume 32 | Number 2 | September 1997 | Pages 232-245
Technical Paper | Tritium System | doi.org/10.13182/FST97-A19893
Articles are hosted by Taylor and Francis Online.
The permeation of protium, deuterium, and an equimolar deuterium-tritium mixture through finger-type Pd-Ag permeators of various configurations operated either in/out or out/in has been compared in parametric studies. The parameters included the permeate pressures; the feed-and-bleed flow rates; and the feed-gas composition, i.e., helium, Q2, and CQ4 (Q-hydrogen, deuterium, tritium). Results on the dependence of the hydrogen isotope breakthrough into the bleed-gas stream and thus on hydrogen isotope decontamination factors were obtained as a function of feed-gas flow. The observed isotopic effects are large, i.e., H2/D2 = 1.72 ± 0.03 and H2/DT = 2.06 ± 0.03. No evidence of permeator deterioration was observed after 1.5 yr of discontinuous operation with hydrogen isotopes—mostly deuterium-tritide. In situ evidence on the integrity of a Pd-Ag permeator was obtained from empirical permeation curves, helium leak measurements, and hydrogen isotope breakthrough curves. Methane poisons Pd-Ag slowly but progressively at 360°C. When the hydrogens in methane are replaced by tritium, the rate of poisoning considerably increases, and after a few days, the overall poisoning becomes severe. The poisoning by hydrocarbons can be completely reversed by heat treatment in laboratory air.