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Division Spotlight
Human Factors, Instrumentation & Controls
Improving task performance, system reliability, system and personnel safety, efficiency, and effectiveness are the division's main objectives. Its major areas of interest include task design, procedures, training, instrument and control layout and placement, stress control, anthropometrics, psychological input, and motivation.
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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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.”
Peter Taylor, William H. Hocking,† Lawrence H. Johnson, Roderick J. McEachern, Sham Sunder
Nuclear Technology | Volume 116 | Number 2 | November 1996 | Pages 222-230
Technical Paper | Radioactive Waste Management | doi.org/10.13182/NT96-A35302
Articles are hosted by Taylor and Francis Online.
Issues relevant to the performance of irradiated (Th,Pu)O2 as a waste form for geological disposal are briefly reviewed. Fuels of this type are among those being considered for burning plutonium from dismantled nuclear weapons in power reactors, including Canada deuterium uranium (CANDU) systems. The high chemical stability and low aqueous solubility of thoria make this type offuel attractive as a waste form. In contrast with UO2 fuel, the inertness of thoria to oxidation dominates most of the chemical issues of fuel disposal. The overall performance of a thoria-based fuel waste form is likely to be determined by the “instant” release of the gap inventories of mobile fission products such as 129I. This in turn will be controlled largely by the inreactor power history and probably also by details of fuel fabrication. Limited experience with thoria-based fuels [chiefly (Th, U)O2] indicates that, for given power and burnup levels, gas releases can be substantially lower than with UO2 fuels. The gap and grain-boundary inventories of fission products are expected to be correspondingly low. A fabrication route involving molecular-level mixing (e.g., sol-gelprocess) would be preferable to powder blending, because microscopic heterogeneities in the fuel might adversely affect the retention of fission products. Pilot-scale irradiation, postirradiation examination, and leaching studies are required to support this preliminary assessment. Other issues that need to be addressed include impurity specifications (to minimize formation of long-lived activation products) and criticality and safeguards issues that might influence the design of fuel-handling facilities.