Search - Number 27 - MODELLING OF ATMOSPHERIC TRANSFER OF RADIONUCLIDES IN THE COMPOSITION OF DUST AROUND OBJECTS OF STORAGE OF RADIOACTIVE WASTE

MODELLING OF ATMOSPHERIC TRANSFER OF RADIONUCLIDES IN THE COMPOSITION OF DUST AROUND OBJECTS OF STORAGE OF RADIOACTIVE WASTE
Cover not present MODELLING OF ATMOSPHERIC TRANSFER OF RADIONUCLIDES IN THE COMPOSITION OF DUST AROUND OBJECTS OF STORAGE OF RADIOACTIVE WASTE
Category: Number 27
Publication: 27
Summary

In this work we presented model setup and results of calculations of yearly average concentrations of radioactive aerosols at the Pridneprovsky Chemical Plant in Ukraine (PChP). For calculation of atmospheric transfer we used diagnostic meteorological model CALMET and model of atmospheric transfer CALPUFF. The simulation of air pollution by radioactive aerosols was carried out by using empirical formulas for PM10 resuspension rates depending on wind velocity and surface properties. The emission of radioactivity was estimated using PM10 emission rate multiplied on soil contamination of the corresponding territory which was estimated from measurements. Territories of tailings and surrounding areas were subdivided onto elementary subsources and for each elementary subsource time dependent resuspension rate was calculated. From the presented comparisons of calculated results with measurements it could be concluded that concentration of Ra-226 and U-238 is well reproduced in simulations at the territory of Suhachivske  tailing. Calculated concentrations at Base-C tailing are somewhat overestimated. At the territories of West, South-East and Central Yarr tailings simulated results agree with observations for both Ra-226 and U-238. Results of calculations are suitable for an assessment of risks of the population. The presented results confirm that the developed methodology could be adapted and used for estimation of the influence of contaminated territories on air pollution due to resuspension in the vicinity to objects of similar to Pridneprovsky Chemical Plant.

Keywords: atmospheric transfer, dust, aerosol, radionuclides, CALPUFF.

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