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Four uranium concentration points, which cannot be explained by the accidental leak from the Socatri plant in Tricastin, were detected yesterday in the water table.
Nuclear waste was discovered on the site of the Tricastin power plant, a little over a week after the accidental release by Socatri, a subsidiary of Areva, of 74 kilograms of natural uranium on the same site. But there would be no connection between the two events. The waste discovered yesterday comes from uranium enrichment activities for military purposes and was buried from 1964 to 1976 under a mound of earth located northeast of the Tricastin site.
Military activity
Jean-Christophe Gariel, Deputy Director of the Environment at the Institute for Radiation Protection and Nuclear Safety (IRSN) explains: "At present there are four points which exhibit fluctuations, values above" background noise "(normal radioactivity), ie above a few micrograms per liter. A certain number of anomalous points had been highlighted during measurements carried out in autumn 2007, which were the subject of a report presented to the authorities at the beginning of the month. A new one, called ET243, was discovered two days ago, said Jean-Christophe Gariel.
He also recalled the presence there of an “old” civilian nuclear site, and “recurrent military activity over the past 30 to 40 years”.
Socatri denounces, for its part, the "amalgam" created by the Commission for independent research and information on radioactivity (CRIIRAD), considering that the mound of earth under which this waste is buried "does not constitute a health risk for populations ". The contamination of the water table under the mound led, from 1980 to 1998, to its pumping for drainage purposes. The mound has since been under surveillance, a study having confirmed the absence of risk for the population.
The controversy over this military waste arose from the persistence of abnormally high uranium levels in the measurements taken since the incident of July 8 at certain points in the water table surrounding Tricastin.
For Corinne Castagnier, director of CRIIRAD, "it is a pollution which was very important in the past but which continues slowly but surely today, and it must be ended as soon as possible".
The Nuclear Safety Authority said yesterday, about the leak itself, that the latest measurements "seemed to indicate a return to normal for almost all of the points monitored in surface water and groundwater". •