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Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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.”
Jungsook Clara Wren, Joanne M. Ball, Glenn A. Glowa
Nuclear Technology | Volume 125 | Number 3 | March 1999 | Pages 337-362
Technical Paper | Radioisotopes | doi.org/10.13182/NT99-A2952
Articles are hosted by Taylor and Francis Online.
Organic impurities in containment water, originating from various painted structural surfaces and organic containment materials, could have a significant impact on iodine volatility following an accident. To determine the effect of these impurities on iodine volatility under accident conditions, literature, experimental, and modeling studies have been conducted on1. the radiolysis of organic compounds in the aqueous phase2. thermal and radiolytic formation and decomposition of organic iodides3. dissolution of organic solvents from various painted surfaces into the aqueous phase4. hydrolysis and aqueous-gas phase partitioning of organic iodides5. iodine deposition on painted surfaces.The experimental studies consist of intermediate-scale "integrated effects" tests in the Radioiodine Test Facility and bench-scale "separate effects" tests. Recent findings from these studies and implications of these studies on the safety analysis of an accident in a nuclear power station are discussed.The studies have shown that organic impurities will be found in containment water as a result of the dissolution of organic compounds from various surface paints. These compounds can have a significant effect on iodine volatility following an accident. The main influence of containment paints on iodine behavior will arise as a result of the aqueous-phase radiolysis of dissolved organic solvents, which are leached from the painted surface by the water. The radiolysis products will decrease the sump pH and dissolved oxygen concentration, consequently increasing the overall rate of conversion of dissolved I- to volatile I2. It appears that the rates of these processes may be controlled by the dissolution kinetics of the organic compounds from the surface coatings. Moreover, organic compounds may also react thermally and radiolytically with I2 to form organic iodides in the aqueous phase. Our studies have shown that the formation of organic iodides in the aqueous phase from soluble organic compounds such as ketones, alcohols, and phenols will have more impact on the total iodine volatility than the formation of CH3I from CH4 and I2 from either the gas or the aqueous phase.