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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.
Kazuichiro Seki, Shigeru Kuwabara, Katsumi Tanimura, Shinsuke Matsumoto, Masao Toba
Nuclear Technology | Volume 74 | Number 1 | July 1986 | Pages 27-37
Technical Paper | Fission Reactor | doi.org/10.13182/NT86-A33816
Articles are hosted by Taylor and Francis Online.
An analysis model has been derived on the vibration of fuel rods in a pressurized water reactor fuel assembly, which is induced by crossflow into the reactor core through a baffle gap. The distribution of speeds of fluid gushing out from a narrow slit onto the fuel rods arrayed in a lattice were first measured and then the force of fluid on fuel rods from an experiment using a mock-up. The force on fuel rods was fitted out using parameters that describe rod position. The amount of energy a fuel rod receives from the fluid through one cycle of its vibrations was calculated as a positional integration of the fluid force. The vibration mode of the fuel rod and the effective momentum flux of the fluid were calculated using the energy. The result of analyzing the effective momentum flux agrees well with the measured result, demonstrating the adequacy of the analysis model developed.
