2D modelling of atmospheric dispersion in the near field at the site of La Hague

¹ Université Paris VI, Laboratoire d'Analyse Numérique, 187 rue du Chevaleret, 75013 Paris, France
² COGEMA, 2 rue Paul Dautier, 78140 Vélizy-Villacoublay, France

Abstract

To refine assessment of radionuclides concentrations in the environment in the very near field at the La Hague site, COGEMA has decided to develop a dedicated 2D dispersion model. This simplified model aims to provide accurate assessment for the main meteorological situations while assuring a computer answer in a limited time (objective of 20 to 30 minutes on a basic computer for a fine mesh). The model has been developed by the University of Paris VI (Numerical Analysis Laboratory) which has provided the software. In order to test and calibrate this research tool, a comparison program with the 3D MERCURE software on academic cases has been launched. Together, a comparison between field measurements of krypton 85, picked up at four monitoring points around the site, and model outputs, has been planned. At the same time, the creation of a user-friendly interface is to be performed to enrich the software, and to facilitate sets of runs for various assumptions (involving model complexity, mesh refinement, meteorological episodes complexity) according to the needs.