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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.”
M. Inutake
Fusion Science and Technology | Volume 39 | Number 1 | January 2001 | Pages 49-55
Invited Review Lectures | doi.org/10.13182/FST01-A11963414
Articles are hosted by Taylor and Francis Online.
Radial potential control by use of end-plate biasing in the GAMMA10 tandem mirror is very effective to suppress low-frequency fluctuations and to achieve a reactive plasma with hot ion temperature of up to 10 keV. In order to clarify effects of both radial electric field and its shear on low-frequency fluctuations, basic experiments have been carried out a small linear device, QT-U of Tohoku University, in which systematic control and precise measurements of radial potential profiles can be done. Flute-mode and drift-mode fluctuations appear in the radial region with steep density gradient. The observed flute-mode is identified as Kelvin-Helmholtz instability driven by strong E × B drift shear. The drift-mode fluctuations depend complicatedly on both radial electric field and its shear. The drift-mode is destabilized in the region of weakly negative electric field. In the strong Eτ region, the mode is suppressed, irrespective of its sign. This behavior agrees qualitatively with that observed in the ECH mode of GAMMA10. The drift-mode in the QT-U is clearly stabilized by the increase in net ion drift shear which is defined as the sum of E × B drift shear and ion diamagnetic drift shear.