ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
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.”
Jungsook Clara Wren, Will Long, Chris J. Moore, Keith R. Weaver
Nuclear Technology | Volume 125 | Number 1 | January 1999 | Pages 13-27
Technical Paper | Reactor Safety | doi.org/10.13182/NT99-A2929
Articles are hosted by Taylor and Francis Online.
The performance of charcoal filters for removing radioiodine from airstreams has been studied under conditions associated with routine reactor operations, as well as under conditions expected following an accident. These studies have led to the development of a physical model that can predict the time-dependent behavior of iodine release from triethylenediamine (TEDA)-impregnated charcoal filters under postaccident conditions. The charcoal filter model and the experimental studies performed to obtain appropriate values for the parameters used in the model are described.The model is a one-dimensional mass balance equation that includes convection, diffusion, and adsorption-desorption processes. The adsorption-desorption kinetics for CH3I on TEDA-impregnated charcoal is based on a two-step process: physical adsorption on the charcoal surface followed by chemisorption on TEDA impregnants, the rate of this chemisorption depending on the concentration of the physically adsorbed CH3I. Experiments were performed to determine the temperature and relative humidity dependences of the parameters used in the model, i.e., the adsorption and desorption rate constants and adsorption capacities. For a given charcoal, it was assumed that the rate constants depend only on temperature, whereas the adsorption capacities depend only on relative humidity. The observed rate constants for the physical and chemical adsorption and desorption processes all show Arrhenius temperature dependences. The observed dependence of adsorption capacity on relative humidity is consistent with the assumption that the adsorption sites are reduced as a result of capillary condensation. The full CH3I breakthrough curves, calculated using the model, reproduced the experimental data very well, supporting the assumption of a two-step adsorption-desorption mechanism. Some of the simulation results are also presented.