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Division Spotlight
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.
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
TerraPower begins U.K. regulatory approval process
Seattle-based TerraPower signaled its interest this week in building its Natrium small modular reactor in the United Kingdom, the company announced.
TerraPower sent a letter to the U.K.’s Department for Energy Security and Net Zero, formally establishing its intention to enter the U.K. generic design assessment (GDA) process. This is TerraPower’s first step in deployment of its Natrium technology—a 345-MW sodium fast reactor coupled with a molten salt energy storage unit—on the international stage.
Renzo Carta, Stella Dernini, Anna Maria Polcaro, Pier Francesco Ricci, Giuseppe Tola, Giancarlo Pierini
Fusion Science and Technology | Volume 15 | Number 1 | January 1989 | Pages 55-63
Technical Paper | Tritium System | doi.org/10.13182/FST89-A25324
Articles are hosted by Taylor and Francis Online.
Recent studies have given lower and lower values for the solubility of hydrogen isotopes in the eutectic 83Pb-17Li alloy, a candidate breeding material for the blanket of fusion machines. Therefore, thermodynamic stability for the gaseous phase under the high pressure reached at the bottom of the alloy containers can be achieved even for very low tritium concentrations in the liquid phase. A mathematical model to determine when tritium bubble nucleation occurs at an appreciable rate is presented. Considering the design parameters and the operating conditions of the Next European Torus project, it is foreseeable that the tritium generated in the blanket could evolve almost completely in the gaseous phase by forming bubbles at the top of the containers even if acceptable values of the tritium inventory (<100 g) and permeation (∼0,5 g·day−1) are maintained. This situation can be achieved if the molten alloy wets the metallic surface poorly and if the fouling on the exchanger side in contact with the cooling water causes a moderate increase of the resistance to tritium diffusion through the walls. Due to a lack of experimental data, a few assumptions are adopted, but the usefulness of the results obtained is not affected.