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Fusion Science and Technology
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.”
Albert K. Fischer
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1012-1017
Blanket Technology | doi.org/10.13182/FST91-A29475
Articles are hosted by Taylor and Francis Online.
The energetics and kinetics of the evolution of H2O and H2 from LiA1O2 are being studied by the temperature programmed desorption technique. The concentrations of H2, H2O, N2, and O2 in a helium stream during a temperature ramp are measured simultaneously with a mass spectrometer. Blank experiments with an empty sample tube showed that square wave spikes of H2 introduced into the helium gas stream were severely distorted by reaction with the tube walls. The tube could be stabilized, however, by sufficiently prolonged heat treatment with H2 so that H2 peaks would not be distorted up to approximately 923 K(650°C). The amount of H2 adsorption/desorption is small compared to the amount of H2O adsorption/desorption. After prolonged treatment with helium containing 990 ppm H2 at 400°C, H2O evolution into the He-H2 stream was observed during 473 to 1023 K (200 to 750°C) ramps at rates of 2 or 5.6 K/min. The different peak shapes reflecting this process were deconvoluted to show that they are composites of only 2 or 3 reproducible processes. The activation energies and pre-exponential terms were evaluated. The different behavior originates in the differences among different surface sites for adsorption. The interpretation of higher temperature peaks (above 873 K (650°C) must still consider the possibility of contributions from interactions with the steel walls. It was found that H2 enhances evolution of N2 from the steel.