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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.
Teruo Yukitoshi, Taishi Moroishi, Isamu Koizumi, Takashi Abe, Kunihiko Yoshikawa, Yoshiaki Shida
Nuclear Technology | Volume 28 | Number 3 | March 1976 | Pages 506-515
Technical Paper | Reactor | doi.org/10.13182/NT76-A31530
Articles are hosted by Taylor and Francis Online.
High-temperature strength, weldability, and decarburization behavior in liquid sodium of 2¼ Cr— 1 Mo steel with a wide variety of heat treatments and some carbon stabilized 2¼ Cr—1 Mo steels are examined for the purpose of material selection of liquid-metal fast breeder reactor (LMFBR) steam generator tubes. Decarburization of 2¼ Cr—Mo steel in sodium can be suppressed when it is appropriately normalized and tempered instead of annealed. The 2¼ Cr—1 Mo—Nb—Ni steel is considered to be preferable to other stabilized steels, since a small addition of nickel assures sufficient strength, even if the normalizing temperature is as low as 950°C. Stabilized steels should be welded carefully to obtain a fully penetrated bead. Preheating above 200°C and postheating above 720°C are required for stabilization. Compared with all the investigated properties, the materials recommended for LMFBR steam generator tubes are normalized-tempered 2¼ Cr— 1 Mo steel and, if decarburization is not allowable, 2¼ Cr—1Mo—Nb—Ni steel, with the condition that a sound-welded joint can be available.
