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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.”
J. H. Harris, T. C. Jernigan, F. S. B. Anderson, R. D. Benson,+ R. J. Colchin, M. J. Cole,+ A. C. England, R. F. Gandy,† M. A. Henderson,† D. L. Hillis, R. L. Johnson,+ D. K. Lee,‡ J. F. Lyon, G. H. Neilson, B. E. Nelson,+ J. A. Rome, M. J. Saltmarsh, C. W. Simpson, D. J. Taylor,+ P. B. Thompson,+, J. C. Whitson‡
Fusion Science and Technology | Volume 17 | Number 1 | January 1990 | Pages 51-61
Technical Paper | Stellarator System | doi.org/10.13182/FST90-A29170
Articles are hosted by Taylor and Francis Online.
The Advanced Toroidal Facility is a large torsatron device with a major radius R0 = 2.1 m, an average plasma minor radius a ≈ 0.3 m, and a magnetic field B0 ≤ 2T. The sheared magnetic configuration [τ(0) ≈ 0.3, τ(a) ≈ 1] is produced by an l = 2, M = 12 field period helical winding set and associated circular vertical field coils. The segmented helical windings were constructed with a tolerance of ±1-mm deviation from the ideal winding law using computer-aided manufacturing and assembly techniques. Nevertheless, in the initial operating period, it was found that field errors produced significant magnetic islands (island width ≈6 cm at τ = ½), which reduced the effective plasma radius by ∼30%. The main cause of these islands was the toroidally asymmetric field perturbation produced by the geometry of the electrical coil feeds. After “symmetrization” of the buswork, the dominant magnetic islands were reduced in size to ≤1 cm at the operating field of 1 T.