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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.”
Alexander W. Abboud, Donna P. Guillen (INL), Richard Pokorny (UCT Prague)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 557-571
A computational fluid dynamics model was developed to support the testing of a laboratory-scale waste glass melter. This work focuses on providing an understanding of how the heat flux convected from the melt pool is affected by the forced bubbling and by the foam layer underneath the cold cap formed by reaction gases. Simulations were performed for high-level waste glass simulants with viscosities near the minimum and maximum values that are expected during the Hanford tank waste vitrification campaign. The model resolves the forced convection bubbling in the molten glass and bubbles in the foam that forms beneath the cold cap. The glass with higher viscosity shows the formation of significantly larger bubbles to overcome the higher viscous force. The foaming thickness under the cold cap in higher viscosity cases is cleared less easily than the low viscosity glass case. However, the percentage of foam in contact with the cold cap is decreased at higher viscosity since the higher viscous force tends to prevent direct contact. This trend is reversed when there is no forced convection supplied by the bubblers. The heat fluxes at the bottom of the cold cap are compared for cases with and without forced convection bubbling. As expected, the convective heat flux increases with bubbling, and the average values for heat transfer coefficients from the CFD show reasonable agreement with Nusselt number correlations for flat plates.