Apports de la surveillance du centre CEA-Valduc sur la connaissance des transferts de l’eau tritiée atmosphérique dans les différents compartiments de l’environnement

Knowledge brought by survey data review from CEA Valduc about transfers in the different environmental compartments. The objective of this document is to describe the behavior of tritium in the environmentfromthesitesurvey dataofaFrench researchcenter.Sincethelate60s, the nuclear site of Valduc has discharged tritium gas and tritiated water into the atmosphere. Those discharges have led to a transfer to the nearby groundwater and rivers. An assessment of the tritium migrating through the hydrogeological system during the 1969-2009 period is presented. Surface survey data also provide a lot of information about transfers by the air pathway to the different compartments: air, rain, soil, plants and animals. The ratios between the different compartment concentrations show that air-leaf transfer is significant, that rain and air deposition are of the same order of magnitude, and that a relatively good equilibrium exists between the free and organic material water of plants. Some outdoor experiments confirm, in agreement with the literature, the level of incorporation in organic materials. Outside the center, water always remained below the present WHO limit