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August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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.”
Gerasimos Tinios, Steve F. Horne, Ian H. Hutchinson, Stephen M. Wolfe
Fusion Science and Technology | Volume 30 | Number 2 | November 1996 | Pages 201-218
Technical Paper | Special Section: Plasma Control Issues for Tokamaks / Experimental Device | doi.org/10.13182/FST96-A30751
Articles are hosted by Taylor and Francis Online.
Linear control models are tested against experimental data from the Alcator C-Mod tokamak. A nonrigid, approximately flux-conserving, perturbed equilibrium plasma response model is used, together with a detailed toroidally symmetric model of the conducting vacuum vessel and the supporting superstructure, and experimentally determined power supply responses. Experiments are conducted with vertically unstable plasmas where the feedback is turned off and the plasma response is observed in an open-loop configuration. The agreement between theory and experiment is found to be very satisfactory, proving that the perturbed equilibrium plasma response model and a toroidally symmetric electromagnetic model of the vacuum vessel and the structure can be trusted for the purposes of calculations for control law design. The closed-loop behavior is also examined by injecting step perturbations into the desired vertical position of the plasma. The control hardware introduces nonlinearities that make it difficult to explain observed behavior with linear theory. Nonlinear simulation of the time evolution of the closed-loop experiments is able to account for the discrepancies between linear theory and experiment. Satisfactory agreement is then obtained between the model including the full multiple input/multiple output control system and the experimental observations.