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Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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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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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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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.”
E. Treille, J. Wendling, F. Plas
Nuclear Technology | Volume 174 | Number 3 | June 2011 | Pages 353-363
Technical Paper | TOUGH2 Symposium / Radioactive Waste Management and Disposal | doi.org/10.13182/NT11-A11745
Articles are hosted by Taylor and Francis Online.
The choice of the Callovo-Oxfordian formation in eastern France for construction of a proposed repository for high-level, long-lived radioactive waste (HLW) is based primarily on the low hydraulic conductivity of the clay-rich host rock. This property is also intrinsically linked to a low capacity of the rock to evacuate the significant amounts of hydrogen gas generated over time by processes such as anoxic corrosion of metallic materials and radiolysis of organic waste. The effects of hydrogen production on the behavior and safety performance of the disposal system components must be evaluated for the operating and postclosure periods of the repository. In order to do this, numerical simulations using TOUGH2-MP were performed on a vitrified waste (HLW) disposal cell and its access drift, for the operating period. The objective was to investigate generation and transfer of hydrogen within and outside the disposal cell, coupled with the desaturation of the access drift near field due to the combined action of drift ventilation and the coupled behavior of dry air and hydrogen within the disposal cell. Particular attention was focused on the form of hydrogen (expressed or dissolved), total gas pressure buildup, degree of gas saturation, gas transport pathways, gas concentrations, and gas exchanges between the disposal cell and the access drift.Simulation results show the validity of the conceptual assumption based on anoxic conditions in the useful part of the disposal system. The major part of the hydrogen comes to the access drift during the operating phase. Internal boundaries between interface zones and concrete lining are preferential pathways for the gas transfer.