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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.”
G. Waidmann
Fusion Science and Technology | Volume 33 | Number 2 | March 1998 | Pages 90-96
Basic Theory and Fusion Devices | doi.org/10.13182/FST98-A11946998
Articles are hosted by Taylor and Francis Online.
Different operational limits of tokamaks are reviewed. The finally limiting processes are hard or soft plasma disruptions or a strong x-ray source. The underlying events are explained as far as the physical causes are known. Treated are the density limit, the low-q-limit, the runaway limit, the β–-limit, and the vertical displacement limit. In addition, the spontaneous MHD-instability and a hollow temperature profile situation are presented. The graphical displays are experimental results from the TEXTOR tokamak.
VIII. SUMMARY
A number of practical limitations for tokamak operation was briefly discussed. These limits play an important role for the operation of future large tokamak devices. They must be avoided by all means to minimize the risk of technical defects on machine and electrical components. The physical mechanisms involved and the precursors to coming disruptions must be known and should be studied on existing experiments today. Strategies to bring the future machines into a safe state, whenever a known precursor to a tokamak disruption is detected, must be developed. Tokamak plasmas are susceptible to disruptive behaviour in the limiting parameter regimes.