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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.”
B. K. Sapra, Y. S. Mayya, Arshad Khan, Faby Sunny, Sunil Ganju, H. S. Kushwaha
Nuclear Technology | Volume 163 | Number 2 | August 2008 | Pages 228-244
Technical Paper | Reactor Safety | doi.org/10.13182/NT08-A3983
Articles are hosted by Taylor and Francis Online.
An experimental nuclear aerosol test facility has been built at the Bhabha Atomic Research Centre for validating the aerosol behavior computer codes used in nuclear reactor safety assessment. Its essential components are the 10-m3 stainless steel test vessel, plasma torch aerosol generator, and aerosol instrumentation to study the aerosol characteristics. Studies have been conducted with metal/metal oxide aerosols in dry environments under varying turbulence conditions and the results have been compared with the predictions of NAUA (Mod 5) code. The code predictions were found to differ from the experimental observations. To explain the differences under calm conditions, a gravity-induced spatial stratification model was formulated and solved. It was found that NAUA prediction agrees fairly well with the depletion of total airborne mass given by this model. In the presence of turbulence, the code overestimated the airborne concentrations. This is attributed to the noninclusion of particle removal by inertial impaction. Accordingly, the deposition velocity formula used in the code was modified based on the Crump-Seinfeld approach. With this modification, the results of airborne mass depletion agreed quite well with the measured data. On the whole, the study provides validated modifications in the NAUA (Mod 5) code to include turbulence effects and a formulation of gravity-induced stratification of aerosols under calm conditions.