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Division Spotlight
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.
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.
Paulo J. Knob, Ralf D. Neef, Hartwig Schaal
Nuclear Technology | Volume 64 | Number 3 | March 1984 | Pages 217-228
Technical Paper | Fission Reactor | doi.org/10.13182/NT84-A33351
Articles are hosted by Taylor and Francis Online.
For pebble bed reactors, the problem exists that an in-core instrumentation is not possible. As a flux mapping method, we have developed the three-dimensional code ZELT-3D, which reconstructs the flux distribution in the core using the detector signals of the side reflector instrumentation as input. The results of a calculation utilizing this code and its associated theory for perturbation of flux distributions by absorber rods show that a three-dimensional flux mapping of perturbed fluxes is possible and positions of absorber rod tips can be detected well. We think that this flux mapping method can serve to locate xenon oscillations, misloaded core areas, and broken parts of absorber rods.
