ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
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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August 2024
Nuclear Technology
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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.”
Daisuke Kawasaki, Joonhong Ahn, Paul L. Chambré, William G. Halsey
Nuclear Technology | Volume 148 | Number 2 | November 2004 | Pages 181-193
Technical Paper | High-Level Radioactive Waste Disposal | doi.org/10.13182/NT04-A3558
Articles are hosted by Taylor and Francis Online.
Results are presented of an analytical study of mass release of a long-lived radionuclide from multiple waste canisters placed in a water-saturated repository in a two-dimensional array configuration. The radionuclide is assumed to be released congruently with the dissolution of the waste matrix. The concentration and release rate of the radionuclide from the downstream side of the repository region are numerically calculated to observe the effects of canister multiplicity and the leach time of the waste form. Peak values of the concentration and the release rate have been analytically formulated.For numerical illustration, the case of a Japanese repository concept is considered, where canisters containing vitrified wastes are placed in a water-saturated granitic rock. For the illustration, the nuclide 135Cs is chosen, which is characterized by a long half-life and high mobility in the assumed geologic media.The peak exit concentration becomes independent of the number of waste canisters in the flow direction if the number is sufficiently great. This peak value is a theoretical upper bound of the exit concentration, regardless of the number of canisters or the waste matrix leach time. The model is suitable for assisting in the design of a repository since the effects of the canister array configuration are reflected by the peak exit concentration and the peak release rate.