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Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
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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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Smarter waste strategies: Helping deliver on the promise of advanced nuclear
At COP28, held in Dubai in 2023, a clear consensus emerged: Nuclear energy must be a cornerstone of the global clean energy transition. With electricity demand projected to soar as we decarbonize not just power but also industry, transport, and heat, the case for new nuclear is compelling. More than 20 countries committed to tripling global nuclear capacity by 2050. In the United States alone, the Department of Energy forecasts that the country’s current nuclear capacity could more than triple, adding 200 GW of new nuclear to the existing 95 GW by mid-century.
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.
