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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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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 26 | Number 3 | November 1994 | Pages 248-254
Technical Paper | Safety/Environmental Aspect | doi.org/10.13182/FST94-A30328
Articles are hosted by Taylor and Francis Online.
The catalytic conversion of tritium gas (HT) to tritiated water (HTO) by cement materials is studied by using mortars made of ordinary Portland cement and Portland blast furnace slag cement exposed to HT at concentrations of 3 to 6 × 109 Bq/m3 in air. Within the experimental conditions, no significant difference in the conversion rate is found between the two types of cement. Extended experiments are carried out by using mortars made of ordinary Portland cement to evaluate the catalytic effect of cement materials. The experimental results are explained by a model that assumes that the conversion is dependent on the geometric surface area of the mortars. The mortar surface is found to play an important role in the conversion. The capacity coefficient in mass transfer on the mortar surface and its standard deviation are found to be (4.3 ± 1.4) × 10−11 m/s. The mechanism of the conversion reaction is uncertain in this study. The conversion rate of the catalytic effect by the cement materials is compared with the conversion rate by the radioactive decay of T2. The HTO produced by the conversion is retained in the pore water of the cement materials.