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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
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
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 since 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. local time 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.”
Sarah Miele, Pranav Karve, Sankaran Mahadevan (Vanderbilt Univ), Vivek Agarwal (INL)
Proceedings | Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technolgies (NPIC&HMIT 2019) | Orlando, FL, February 9-14, 2019 | Pages 976-982
In this work, we investigate the suitability of a novel dynamics-based method, namely vibroacoustic modulation (VAM), for the detection and localization of cracks caused by the alkali-silica reaction (ASR). ASR is a chemical reaction between the cement and certain aggregates containing amorphous silica. In a VAM test, the structural component is excited using two frequencies. The frequency modulation (and hence the nonlinear structural behavior) appears as sidebands around the higher (probing) frequency in the linear spectrum (LS) of the measured response in the neighborhood of the damage zone. A map of the magnitude of such sidebands can be used to detect and localize the damage [1]. We perform laboratory experiments to investigate VAM-based damage diagnosis in thick concrete components. We describe laboratory testing on a cement slab containing four pockets of reactive aggregates placed at known locations. Our experiments show that VAMbased testing with optimized test parameters and suitable sensor density can potentially be used to detect and localize cracks in thick concrete structures.