LES ACTIVITÉS NUCLÉAIRES : RAYONNEMENTS IONISANTS ET RISQUES POUR LA SANTÉ ET L’ENVIRONNEMENT Environment monitored or type of inspection Cattenom NPP (ASN resolution 2014-DC-0415 of 16 January 2014) Orano La Hague plant (ASN resolution. 2015-DC-0535 of 22 December 2015, as amended) Air at ground level • 4 stations for the continuous sampling of atmospheric dust on fixed filters, with daily measurements total β activity (βG) – γ spectrometry if βG > 2 mBq/m3 – Spectrometry γ monthly on groupings of filters per station • 1 continuous sampling station downwind of the prevailing winds, with weekly measurement of atmospheric 3H • 5 stations continuously sampling atmospheric dust on a fixed filter with daily measurements of total α, total (αG) and total β activity (βG) – γ spectrometry if αG or βG > 1 mBq/m3 – Monthly α (Pu) spectrometry on grouping filters per station • 5 continuous sampling stations for halogens on specific adsorbent with weekly γ spectrometry to measure iodines • 5 continuous sampling stations with weekly measurement of atmospheric 3H • 5 continuous sampling stations with bi-monthly measurement of atmospheric 14C • 5 continuous measurement stations for 85Kr activity in the air Ambient γ radiation • Continuous measurement with recording: – 4 detectors at 1 km – 10 detectors on the site boundary – 4 detectors at 5 km • 5 detectors with continuous measurement and recording • 11 detectors with continuous measurement at the site fencing Rain • 1 continuous sampling station under the prevailing winds with bi-monthly measurement of βG and 3H • 2 continuous sampling stations including one under the prevailing winds with weekly measurement of αG, βG and 3H • γ spectrometry if significant αG or βG Receiving environment liquid discharges • Sampling in the river upstream of the point of discharge and in the the correct mixing zone for each discharge – Measurement of βG, potassium (K)(*) and 3H • Continuous sampling in the river at the good mixing point – 3H measurement (average daily mixture) • Annual sampling of sediments, fauna and flora upstream and downstream of the discharge point with γ spectrometry, free 3H measurement and, on fish, organically bound 14C and 3H • Periodic sampling of a stream and in the reservoir surrounding the site with measurements of βG, K, 3H • Daily seawater samples at two points on the coast, with daily measurements (γ spectrometry, 3H) at one of these points and for each of the two points, α and γ spectrometry and βG, K, 3H and 90Sr measurements • Quarterly seawater sampling at 3 points offshore with γ spectrometry and measurements of βG, K, 3H • Quarterly sampling of beach sand, seaweed, algae and limpets at 13 points with γ spectrometry + 14C measurement and α spectrometry for algae and limpets in 6 points • Sampling of fish, crustaceans, shellfish and molluscs in 3 coastal zones of the Cotentin with α and γ spectrometry and 14C measurement • Quarterly sampling of marine sediments offshore at 8 points with spectrometry α and γ measures 90Sr • Weekly to six-monthly samples of water from 19 streams around the site, with αG, βG, K and 3H measurements • Quarterly sampling of sediments from the 4 main streams adjacent to the site, with γγand α spectrometry • Quarterly samples of aquatic plants in 3 streams in the vicinity of the site with γ spectrometry and 3H measurement Groundwaters • 4-point monthly samples, fortnightly at 1 point and quarterly at 4 points with measurements of βG, K and 3H • 5 sampling points (monthly control) with measurements of αG, βG, K and 3H Water for consumption • Annual sampling of water intended for human consumption, with βG, K and 3H measurements • Periodic sampling of water intended for human consumption at 15 points, with measurements αG, βG, K and 3H Soil • 1 annual sampling of the surface layer of earth with γ spectrometry • Quarterly samples at 7 points with γ spectrometry and 14C measurement Vegetation • 2 grass sampling points, including one under the prevailing winds, monthly γ spectrometry and quarterly 14C and C measurements • Annual campaign for the main agricultural crops, with γ spectrometry, 3H and 14C measurements • Monthly and quarterly grass samples taken at 5 points at 5 other points withγ spectrometry and 3H and 14C measurements – Annual α spectrometry at each point • Annual campaign for the main agricultural crops, with α and γ spectrometry, 3H, 14C and 90Sr measurements Milk • 2 sampling points situated at 0 to 10 km from the installation, including one under the prevailing winds, with monthly γ spectrometry, quarterly 14C measurement and annual 90Sr and 3H measurement • 5 sampling points (monthly check) with γ spectrometry, K, 3H, 14C and 90Sr measurement αG= α total; βG= β total * Measurements of total concentration of potassium by spectrometry for 40K. TABLE 12 Examples of radiological monitoring of the environment around BNIs 168 ASNR Report on the state of nuclear safety and radiation protection in France in 2025
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