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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.”
G. Granucci, A. Airoldi, E. Barbato, A. Bruschi, A. Cardinali, C. Castaldo, R. Cesario, S. Cirant, B. Esposito, D. Farina, F. Gandini, G. Giruzzi, C. Gormezano, M. Leigheb, M. Marinucci, F. Mirizzi, S. Nowak, L. Panaccione, V. Pericoli-Ridolfini, S. Podda, G. Ramponi, G. L. Ravera, A. N. Saveliev, A. Simonetto, C. Sozzi, A. A. Tuccillo, F. Zonca
Fusion Science and Technology | Volume 45 | Number 3 | May 2004 | Pages 387-401
Technical Paper | Frascati Tokamak Upgrade (FTU) | doi.org/10.13182/FST04-A521
Articles are hosted by Taylor and Francis Online.
This chapter reports the main physics results obtained with three radio-frequency-injection systems. The frequency of 8 GHz for the lower hybrid (LH) current drive (CD) (LHCD) system was chosen to explore CD at high density: full CD has been demonstrated for central densities up to 1.4 × 1020 m-3 at 0.5 MA with an applied power up to 2.0 MW. The Frascati Tokamak Upgrade (FTU) database shows CD efficiencies from 0.1 to 0.3 × 1020 AW-1 m-2. In combined experiments with electron cyclotron (EC) waves (140 GHz, up to 1.2 MW), a suprathermal absorption by the fast electron tail generated by LHCD has been observed in both downshifted and upshifted interaction regimes, with the resulting electron cyclotron current drive (ECCD) ranging from 20 to 100 kA, depending on experimental conditions. With pure EC resonance heating, the narrowness of the radial power deposition profile has been exploited, resulting in strong local electron heating. Results in high-density regimes are also presented. The third system (433 MHz, 0.5 MW) is the first to test ion Bernstein wave (IBW) coupling with a waveguide antenna. The experiment operates at high frequency, avoiding the occurrence of nonlinear phenomena at the edge. Improved confinement regimes resulting in a central peaking of the pressure profiles have been achieved with PIBW up to 0.4 MW. Modeling and experimental results are summarized.