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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.”
Koichi Maki, Satoshi Satoh, Hideyuki Takatsu, Yasushi Seki
Fusion Science and Technology | Volume 27 | Number 2 | March 1995 | Pages 176-182
Technical Paper | Special Section: Pulsed High-Density Systems / Maintenance | doi.org/10.13182/FST95-A30374
Articles are hosted by Taylor and Francis Online.
According to the International Thermonuclear Experimental Reactor (ITER) conceptual design activity, after reactor shutdown, damaged segments are pulled up from the reactor and hung from the reactor room ceiling by a remote handling device. The dose rate in the reactor room and the environment is estimated for this situation, and the following results are obtained: First, the dose rate in the room is >108 µSv/h. Since this dose rate is 107 times greater than the biological radiation shielding design limit of 25 µSv/h, workers cannot enter the room. Second, lenses and optical fiber composed of glass that is radiation resistant up to 106 Gy would be damaged after <100 h near the segment, and devices using semiconductors could not work after several hours or so in the aforementioned dose-rate conditions. Third, during suspension of one blanket segment from the ceiling, the dose rate in the site boundary can be reduced by one order by a 23-cm-thicker reactor building roof. To reduce dose rate in public exposure to a value that is less than one-tenth of the public exposure radiation shielding design limit of 100 µSv/yr, the distance of the site boundary from the reactor must be greater than 200 m for a reactor building with a 160-cm-thick concrete roof.