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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.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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
Constellation seeks rezone for property adjacent to Illinois plant
While no development details have been released, Constellation is asking to rezone 658.8 acres of land it owns around the Byron nuclear plant in Illinois for possible long-term use.
Wael Hilali, Michael Buck, Joerg Starflinger (Univ of Stuttgart)
Proceedings | 2018 International Congress on Advances in Nuclear Power Plants (ICAPP 2018) | Charlotte, NC, April 8-11, 2018 | Pages 215-222
In a hypothetical severe accident in light water reactors, a deep pool of water is employed in the lower drywell of the containment, to cool the core melt materials discharged from the reactor pressure vessel. By contact with water, the molten corium will fragment, solidify and settle at the bottom as a porous debris bed. The preeminent goal becomes how to prevent the re-melting of the debris in consequence of insufficient cooling. One of the main factors affecting the ability of decay heat removal is the geometrical configuration of the bed, which can also change due to the particles redistribution induced by steam production within the bed. In this work, the influence of steam production on bed formation was investigated experimentally with the dedicated BeForE-facility. A series of experiments were conducted by discharging solid particles in in two-dimensional viewing vessel, while air bubbles simulating the steam production are injected simultaneously from the bottom. Depending on the quantity of the settled particles on the top of each section of the vessel, air flow rate is so monitored and adjusted in time to simulate the corresponding amount of steam produced by the similar quantity of debris. Based on the obtained experimental results, a numerical model is established to simulate the two-dimensional debris bed formation under the influence of steam production.