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Division Spotlight
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
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.”
Yongliang Xiong, Yifeng Wang (SNL)
Proceedings | International High-Level Radioactive Waste Management 2019 (IHLRWM 2019) | Knoxville, TN, April 14-18, 2019 | Pages 186-188
Spent nuclear fuel (SNF) is presently being stored at reactor sites awaiting shipment offsite. Analyses conducted for the US Department of Energy (DOE) to evaluate potential strategies for removing SNF from reactor sites use detailed, agent-based models of SNF storage and transportation. Often these models include assumptions to facilitate analysis. Some assumptions might rely on expert judgement, and others are implicitly made when analysis is performed. One common, implicit assumption is that there is no preferred time of year to load casks. Another assumption is that operating reactor sites can only load a fixed number of casks per year. An examination of cask loading dates might improve the quality of these and other assumptions and provide further insight into industry practice. Investigators reviewed dates listed in cask registration letters submitted to the US Nuclear Regulatory Commission. The cask loading dates were then evaluated to identify patterns that would shed light on the validity of assumptions. First, the typical number of casks loaded in a campaign was examined. Next, the time between cask loadings was examined. Seasonal variations were evaluated, along with variations that appear to occur as a result of plant outage cycles. Finally, some larger loading campaigns were noted. Loading campaign size and the relationship between loading campaigns and outages followed notable trends. For smaller sites with fewer reactors, a relatively large degree of scheduling flexibility appears to be present. However, for sites having more reactors, less flexibility is observed, and the relationship between outages and dry cask loading is clearly apparent. It is clear that fewer casks are loaded during the spring and fall, when outages are more likely. Furthermore, cask loadings are reduced during the winter months.