%A"Cochinal, R [Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires]" %D1959 %I; CEA Saclay, 91 - Gif-sur-Yvette (France) %2 %J[] %K21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS, 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS, AEROSOL MONITORING, AIR CLEANING SYSTEMS, AIR FILTERS, CHINON-1 REACTOR, G-1 REACTOR, G-2 REACTOR, G-3 REACTOR, HOT LABS, INDOOR AIR CONTAMINATION, MAINTENANCE, MAXIMUM PERMISSIBLE CONCENTRATION, MAXIMUM PERMISSIBLE DOSE, RADIATION MONITORING, RADIOACTIVE AEROSOLS, REMOTE HANDLING %PMedium: ED; Size: 14 pages %TProblems presented by the filtration and sampling of aerosols in the atomic energy programme; Problemes poses par la filtration et le prelevement des aerosols dans le cadre de l'energie atomique %XThe maximum permissible limits for radioactive aerosols are much lower than those for aerosols encountered in the non-nuclear industries. These limits depend on numerous factors such as: nature of the radiation, half-life, etc. The radioactive aerosols can be prepared by various methods. The filtering of the air in high activity laboratories or in plutonium treatment factories necessitates an installation consisting of: - aspiration filters, - extraction filters of very high efficiency (those used for {alpha} emitter cells: designed to be replaced without incurring contamination risks; those used for {gamma} emitter cells: designed to be replaced by remote control). The filtering in nuclear reactors is also effectuated by filter papers: - the G1 reactor with open circuit: the air coolant is entirely filtered at the entry and on leaving; - the G2, G3 and EDF1 reactors with closed circuits: filtering under pressure of a small portion of the coolant gas. (author) [French] Les limites maxima permises des aerosols radioactifs sont beaucoup plus faibles que celles des aerosols rencontres dans l'industrie classique. Elles dependent de nombreux facteurs tel que: nature du rayonnement, periode radioactive, etc... La formation des aerosols radioactifs est de nature diverse. La filtration des laboratoires de haute activite, ou d'usines d'elaboration de plutonium conduit a des types d'installations comportant: - des filtres d'aspiration; - des filtres d'extraction a rendement extremement eleve (type pour cellules emettrices {alpha} concu pour etre change sans risque de contamination, type pour cellules emettrices {gamma}: concu pour etre change a distance) La filtration des reacteurs nucleaires sont egalement effectuee par des papiers filtres: - reacteur G1 a circuit ouvert: air de refroidissement totalement filtre a l'aspiration et a l'extraction; - reacteurs G2, G3, EDF1: a circuit ferme: filtration sous pression d'une faible partie du gaz de refroidissement. (auteur) %0Technical Report %NCEA-R-1789;TRN: FR07R1789116765 %1 %CFrance %Rhttps://doi.org/ TRN: FR07R1789116765 FRN %GFrench