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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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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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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Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
L. Bosland, G. Weber, W. Klein-Hessling, N. Girault, B. Clement
Nuclear Technology | Volume 177 | Number 1 | January 2012 | Pages 36-62
Technical Paper | Reactor Safety | doi.org/10.13182/NT12-A13326
Articles are hosted by Taylor and Francis Online.
The Institut de Radioprotection et de Sûreté Nucléaire (IRSN), France, and the Gesellschaft für Anlagen- und Reaktorsicherheit (GRS), Germany, have been involved in the analyses and modeling of PHEBUS tests and particularly in iodine chemistry behavior in the containment. To analyze the accuracy of the chemistry models developed and reproduce volatile iodine formation, iodine behavior in PHEBUS FPT-1 containment was modeled by both IRSN and GRS with two different codes: ASTEC and COSOSYS. The ways of modeling (using the ASTEC/IODE and COCOSYS/AIM respective modules) and the nodalization of both approaches are presented and compared, as well as the assumptions made to perform the calculations. The results of the comprehensive analyses are compared with the experimental results, and interpretation of the iodine behavior in the PHEBUS FPT-1 containment is given. Then, a common point of view is concluded that highlights the lack of knowledge for some phenomena of significant impact on the iodine behavior in the containment during a severe accident. Organic iodide and iodine oxide formation models in particular are pointed out for the gaseous phase. The need for improving iodine behavior models including their coupling to thermal hydraulics and aerosol physics is also explained.