Atmospheric dispersion of radionuclides from the Fukushima-Daichii nuclear power plant

CEREA, joint laboratory École des Ponts ParisTech and EdF R&D
Victor Winiarek, Marc Bocquet, Yelva Roustan, Camille Birman, Pierre Tran

Map of ground deposition of caesium-137 for the Fukushima-Daichii accident (updated 20 June 2013).

The simulation was performed with a specific version of the numerical atmospheric chemistry and transport model Polyphemus/Polair3D. The parametrisations used for the transport and physical removal of the radionuclides are described in [6,7,8,9].

The source term has been estimated by the assimilation of activity concentrations in the air as well as activity deposited on the ground [1,2].

The magnitude of the deposition field is uncertain and the simulated values of deposited radionuclides could be significantly different from the actual deposition. In particular, the source term remains uncertain, athough its uncertainty has been narrowed down thanks to data assimilation.

Other results obtained by collaborators about the Fukushima radionuclides dispersion accident are references below [3,4,5].