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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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
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.
Mark S. Lanza (Framatome Inc.), Donald R. Todd (PNNL)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 27-32
A general based charcoal filter model was added to the thermal hydraulics code GOTHIC Version 8.2. The model can be used to simulate unsteady iodide transport and adsorption within a charcoal filter that is used to filter vapor exiting the containment of a nuclear plant. The code accepts user inputs for adjusting filtering efficiency and performs calculations for the time and space dependent concentration of iodides in the vapor phase as well as the adsorbed phase within a charcoal filter.
The model includes advective and diffusive transport for iodides coupled with a sorption kinetics model, including first-order reversible physisorption and second-order irreversible chemisorption. Multiple independent gaseous compounds can be modeled simultaneously. The iodide compounds within these gasses are coupled by a decay-chain model and the combined concentration of the gaseous compounds is coupled to the chemisorption capacity of the filter.
Validation of the model to predict iodide transport and sorption within impregnated, activated charcoal was performed through experimental benchmarking. The validation demonstrates that the numerical solution correctly predicts measured data.