Mid-range atmospheric dispersion modelling. Intercomparison of simple models in EMRAS-2 project.
An intercomparison of atmospheric dispersion models has been carried out for a hypothetical accident occurring in a nuclear power plant in the center of Spain. The accident consisted of a steam generator tube rupture, and two radionuclides have been considered for the exercise: 137-Cs and 131-I. Meteorological conditions and radionuclide release rates were supplied. Models provided deposition maps, timeintegrated concentrations in air and arrival times of the plumes to specific locations. The effect of the meteorological conditions used in the modelling was clear, with different behavior of the plume with neutral stability vs. stable conditions. The predicted arrival times of the plume at specific locations showed much less variability than deposition and air concentrations. This variability in part reflects the uncertainties inherent in atmospheric dispersion modelling and in the selection of parameter values, such as deposition velocities or diffusivities.
University of Seville, ETSIA, Ctra Utrera km 1, 41013, Sevilla, Spain. Electronic address: rperianez@us.es.
Raúl
R
Periáñez
Oak Ridge Center for Risk Analysis, 102 Donner Drive, 37830, Oak Ridge, Tennessee, USA.
Kathleen M
KM
Thiessen
Canadian Nuclear Laboratories, K0J 1J0 Chalk River, Ontario, Canada.
Sohan L
SL
Chouhan
SOGIN S.p.A., Via Torino, 6, I-00184, Rome, Italy.
Francesco
F
Mancini
Institut de Radioprotection et de Sûreté Nucléaire, 31 Avenue de la division Leclerc BP17, F-922625, Fontenay-aux-Roses, France.
Emilie
E
Navarro
Austrian Institute of Technology, A-2444, Seibersdorf, Austria.
Gert
G
Sdouz
Federal Authority for Nuclear Regulation, Sheikh Zayed First Street, P.O. Box 112021, Abu Dhabi, United Arab Emirates.
Dejan
D
Trifunović
D000396:Air Pollutants, Radioactive / Q000032:analysis; D002588:Cesium Radioisotopes / Q000032:analysis*; D007457:Iodine Radioisotopes / Q000032:analysis; D008962:Models, Theoretical; D055848:Nuclear Power Plants; D011834:Radiation Monitoring / Q000379:methods*; D018788:Radioactive Hazard Release
D000396:Air Pollutants, Radioactive; D002588:Cesium Radioisotopes; D007457:Iodine Radioisotopes
131-I; 137-Cs; Atmospheric dispersion; Model; Nuclear power plant