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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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August 2024
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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.”
C. A. Nixon, W. R. Marcum, A. W. Weiss (Oregon State Univ), K. M. Steer, R. B. Jackson, M. G. Martin (TerraPower)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 493-504
Presently there exist no experimental methods readily available to characterize the comprehensive motion of wire-wrapped pins for the purpose of measuring fluid structure interactions. Specifically, the dearth of capabilities lies in the need to capture pin-to-pin interactions within the bundle that do not have visual access. This study leverages upon recent previous efforts that have demonstrated the successful use of a distributed strain sensor (DSS) to characterize the motion of a single wire-wrapped pin under fluid flow and expands through use of multiple instrumented pins to characterize the simultaneous motion of pin-to-pin interaction. The outcome of this study demonstrates the direct measurement of pin-to-pin contact, rubbing and interaction over a range of relevant flow rates on a 19-pin wire-wrapped bundle.