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Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
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.
