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Fusion Science and Technology
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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.”
Gerasimos Tinios, Steve F. Horne, Ian H. Hutchinson, Stephen M. Wolfe
Fusion Science and Technology | Volume 24 | Number 4 | December 1993 | Pages 355-365
Technical Paper | Plasma Engineering | doi.org/10.13182/FST93-A30186
Articles are hosted by Taylor and Francis Online.
The problem of reducing a complicated electromagnetic passive structure model coupled to a linear plasma response model to a size that allows rapid calculations of gains for plasma position and shape control is discussed. Model reduction through eigenmode decomposition does not reproduce the input-to-output relationship of the system unless one has a good idea of which eigenmodes are important. Hankel singular mode decomposition, on the other hand, provides an orthogonal basis for the system response, where the modes are ordered by their importance to the input-to-output relationship. A perturbed equilibrium plasma response model is used together with an electromagnetic model of the Alcator C-Mod passive structure to assess the performance of different model reduction schemes. Between 10 and 20 modes are required to give an adequate representation of the passive system. Emphasis is placed on keeping the reduction process independent of the parameters of the plasma to be controlled.