Assessment of the level of radioactivity in the environment of the Monts d'Arree, based on a review of radioecological studies and the results of regulatory monitoring - Work initiated by the Brennilis Local Information Commission as part of its mission to inform the public - Study report, June 20, 2011 version. Additional measurements of radioactivity levels in the vicinity of the Monts d'Arree nuclear site - Study carried out for the Citizen Observatory of Radioactivity in the Environment (OCRE), Version of 27/07/17. Local Information Commission of the Monts d'Arree, Shared monitoring of the nuclear site - Reading grids, summary 2011-2019

This document is a compilation of the works carried out by the Acro in collaboration with the Monts d'Arree Local Information Commission (CLI) as part of the shared monitoring of the dismantling work at the Brennilis nuclear site. A first paper draws up a radiological inventory of the site including its environment. To carry out this work, several thousands of pieces of data in 'circulation' were used, whether from the operator's own monitoring, from government departments, or from specific studies carried out by third parties. A second paper provides additional data in locations and matrices that are not part of the regulatory monitoring or for which reference values may be lacking. To this end, the work was divided into two complementary parts, with the aim of gaining knowledge of the radiological situation in the near-field terrestrial and aquatic environment of the nuclear facility currently being dismantled. The last paper presents the shared monitoring tools implemented to follow the progress of the dismantling work, in particular the reading grid designed to facilitate the understanding and interpretation of data from regulatory (and other) monitoring of the Monts d'Arree nuclear site undergoing decommissioning