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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.”
W. A. Walls, J. H. Gully, W. F. Weldon, H. H. Woodson
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1154-1159
Ignition Device | doi.org/10.13182/FST91-A29499
Articles are hosted by Taylor and Francis Online.
The concept for a single-turn tokamak experiment IGNITEX1 makes possible the realization of a controlled, self-sustained fusion reaction in the near term with relative simplicity and low cost. The IGNITEX tokamak utilizes low-impedance toroidal field (TF) and poloidal field (PF) magnet systems which induce the high-level fields and currents required for fusion ignition. These magnet systems require power supplies that can meet strict operational conditions. Homopolar generators (HPGs) are well suited for operation of a single-turn tokamak because they are inherently high current, low-voltage machines which can kinetically store all the energy required for a pulsed discharge. The energy storage is accomplished in a compact manner by using high speed composite flywheel technology and provides the added advantage of keeping electrical grid power requirements very low. Finally, since HPGs are simple dc machines, their cost is low and rectifier systems are not necessary. In this paper, the HPG technologies to be utilized in a fusion ignition experiment are described. The various components, materials, and design considerations for the HPG current-collection systems are reviewed, including rotor slip ring, brushes, and actuators. Design, fabrication, and assembly techniques for the lightweight, composite, energy-storage flywheel are given. The status of these HPG technologies relative to IGNITEX power supply requirements are reviewed. The modes of operation of the TF and PF magnet systems are analyzed. Questions of reliability of operation, maintenance, and cost evaluation are also addressed. Finally, the construction and testing of a full-scale prototype IGNITEX HPG power supply module is proposed.