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The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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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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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.”
Shigeo Numata, Yasuhiko Fujii, Makoto Okamoto
Fusion Science and Technology | Volume 19 | Number 1 | January 1991 | Pages 140-145
Technical Paper | Safety/Environmental Aspect | doi.org/10.13182/FST91-A29323
Articles are hosted by Taylor and Francis Online.
Depth profiles of tritiated water in concrete walls measured in a heavy water reactor are analyzed using a diffusion model. The apparent diffusion coefficient of tritiated water in concrete made with a standard mixing proportion is 3.3 × 10−11 m2/s. In addition to the primary diffusion mechanism, there is evidence of a second mechanism, possibly a fast diffusion process. The diffusion model can be applied to tritiated water penetration into concrete when the concrete walls of fusion reactors are exposed to air containing tritiated water vapor. In the heavy water reactor, the average concentration of tritiated water in the air over 20 yr is estimated to be ∼2.0 × 10−2 Bq/cm3. The tritium inventory in concrete is ∼1.0 × 107 Bq/m3 in the region <0.65 m deep. A 0.2-m-thick concrete wall is sufficient to prevent tritium release into the environment from exceeding the regulatory limit.