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WP 3. Atmosphere

The work package focused on atmospheric modelling and the assessment of radionuclide distribution in cases of accidents in the EuroArctic region with the release of radioactive substances to the environment. The work package was divided into two parts: computational and experimental methods.

The Arctic Research Centre of Finnish Meteorological Institute (FMI) was in the lead of WP 3. The activities and main results included

  1. The modelling of two hypothetical nuclear accidents. The other was supposed to take place in the planned Hanhikivi Nuclear Power Plant in North Ostrobothnia in Finland, the other on the possible Floating Nuclear Power Plant on the arctic sea area north of Kola Peninsula. Dispersion of fallouts and exposures to local populations on radiation were modelled and long-term effects assessed.
  2. The effects of both hypothetical accidents were studied by calculating dispersion estimations. The estimates gave the most likely and the worst possible situation for dispersions of radioactive substances, their concentration and fallout levels, and the radiation doses and radiation exposure on population. The dispersion of the radioactive plume from Hanhikivi NPP was calculated in several different weather conditions and different times of year.
  3. The modelling results were validated by comparing the calculated levels with the observed concentrations of atmospheric radioactivity in Finnish Lapland. FMI has followed the concentrations of natural and artificial radionuclides in the air in Rovaniemi, Northern Finland since 1960s by collecting, analyzing and archieving weekly air filter samples. The atmospheric concentrations of several radiologically important radionuclides were analyzed, and the levels were compared with the modeled concentrations of radionuclides from the two hypothetical accidents.
  4. The SILAM model of FMI and SNAP model of Norwegian Meteorological Insitute (MET) were compared in order to develop and enhance the performance of both models.

WP 3 publications:

 A report on the comparison of SILAM and SNAP models (available upon request from NRPA or STUK): Bartnicki, J.; Klein, H.: Comparison of SILAM and SNAP results in the frame of the CEEPRA project.