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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.”
Yuji Nakamura, Masahiro Wakatani, Jean-Noel Leboeuf, B. A. Carreras, N. Dominguez, Jeff A. Holmes, V. E. Lynch, S. L. Painter, Luis Garcia
Fusion Science and Technology | Volume 19 | Number 2 | March 1991 | Pages 217-233
Technical Paper | Plasma Engineering | doi.org/10.13182/FST91-A29361
Articles are hosted by Taylor and Francis Online.
Confinement properties of l-2 torsatron/heliotron configurations with number of toroidal field periods, M, in the range of 10 to 14 are studied. This involves the calculation of zero-current and flux-conserving equilibria; stability against Mercier modes and low-n ideal modes, with n denoting the toroidal mode number; and orbit confinement of deeply trapped energetic particles. Optimization of both mag-netohydrodynamic (MHD) and transport properties is pursued under the condition of plasma aspect ratio A = R/a ≥ 7, with R denoting the major radius and a the average plasma radius. For configurations with M ≤ 12, an average MHD beta limit of 4 to 5% is possible. The addition of a quadrupole field improves the confinement of trapped particles at zero pressure, but particle losses increase with increasing beta. This loss is less severe if the vacuum magnetic axis is shifted slightly inward. A configuration with M = 10, a coil pitch parameter pc in the range 1.25 to 1.30, and an added quadrupole field satisfies the beta and energetic particle confinement requirements for the next generation of large torsatron/heliotron devices.