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Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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.”
Robert C. Bowden, Casey Tompkins, Sun-Kyu Yang (CNL)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 751-764
In this experimental investigation, mean liquid velocity fields were investigated for turbulent flow within a horizontal 7-rod bundle geometry using Particle Image Velocimetry (PIV). PIV measurements were conducted at two axial locations, near the bundle inlet and also near the mid-plane, and at four Reynolds numbers ranging from approximately 8400 to 21000 based on a hydraulic diameter of 7.636 mm. The axial velocity fields in three different gap regions of the 7-rod bundle were reported, including rod-rod gaps and rod-channel gaps. Statistical techniques were used to describe the velocity fields, including mean and turbulent velocity components. The instantaneous and ensemble-averaged velocities in the gap regions are shown to be aligned in the axial (horizontal) flow direction, with a negligible mean vertical components. It was found that the maximum velocity profile was between 20 to 25% higher than the average velocity, while measured axial turbulent velocity typically ranged between 10 to 20% of the corresponding mean velocity. Profiles of local mean and turbulent velocity components in the gap regions were found to be self-similar when normalized using the maximum velocity, and local velocity, respectively.