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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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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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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.
S. Dulla, P. Ravetto, M. M. Rostagno
Nuclear Science and Engineering | Volume 148 | Number 1 | September 2004 | Pages 89-102
Technical Paper | doi.org/10.13182/NSE04-A2444
Articles are hosted by Taylor and Francis Online.
The objective of the work is the determination of the importance of transport effects in subcritical systems driven by an oscillated neutron source. The transport equation is solved in the frequency domain for two-dimensional source-driven systems, using the discrete ordinates method. Some problems connected with the application of synthetic acceleration procedures for the solution of the transport equation in the frequency domain are addressed. Comparisons between transport and diffusion results allow identification of physical situations (multiplying system geometry and material characteristics) in which transport effects could be important for a certain range of the frequency of the source.
