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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.”
T. Numakura, T. Cho, J. Kohagura, M. Hirata, R. Minami, Y. Nakashima, K. Yatsu, S. Miyoshi
Fusion Science and Technology | Volume 39 | Number 1 | January 2001 | Pages 277-280
Poster Presentations | doi.org/10.13182/FST01-A11963460
Articles are hosted by Taylor and Francis Online.
A new method is proposed for obtaining radial profiles of both plasma ion (Ti) and electron temperatures (Te) simultaneously using one semiconductor detector array alone. Furthermore, availability of the new idea of the simultaneous Ti and Te diagnostics is experimentally demonstrated by the use of a small-sized semiconductor detector array. This novel method for semiconductor Ti diagnostics is proposed on the basis of an alternative “positive” use of a semiconductor “dead layer” as an energy-analysis filter. Filtering dependence of charge-exchange neutral particles from plasmas on the thickness on the order of nm thick SiO2 layer is used for analyzing Ti ranging from hundreds to thousands eV. In this report, proof-of-principle plasma experiments for the proposed idea are, at first, demonstrated in the GAMMA 10 tandem mirror to verify the availability of this novel idea of distinguishing and identifying each value of Ti and Te by the use of various thin filtering materials. Furthermore, novel experimental data on radial profiles of Ti and Te are simultaneously observed and analyzed using a semiconductor detector array along with the development of a Monte-Carlo computer simulation code for analyzing interactions between semiconductor materials and incident particles. The radial profiles of Ti and Te obtained from semiconductor detectors by the use of the proposed method are found to be in good agreement with those from a charge-exchange neutral-particle Ti analyzer and a microchannel-plate Te detector. Detailed data and analysis method are represented in the paper.