The ASN can rely, for its missions, on the General Directorate for nuclear safety and radioprotection, a centralized administration based in Paris (Direction générale de la sûreté nucléaire et de la radioprotection”, DGSNR) and the Divisions of nuclear safety and radioprotection (Divisions de sûreté nucléaire et de rdioprotection”, DSNR)) set up within the Regional Directorates for Industry, Research and the Environment (DRIRE).
ASN takes its regulatory decisions after the assessment of the licence applications by the Institute for Nuclear Safety and Radiation Protection (IRSN).
In the context of application for Basic Nuclear Installations (INB) licences, modification or final shutdown and decommissioning decrees, the Consultative Commission for Basic Nuclear Installations (CCINB) is consulted by the Ministry of Ecology, Energy, Sustainable Development and Territorial Planning and the Minister of Finance, Economy and Employment. Nuclear facilities which are not considered as Basic Nuclear Installations (INB) because they deal with a quantity of radioactive material at an activity level below the INB threshold are required to comply with the environmental protection provisions specified in the Act 76-663 of 19 July 1976, insofar as they belong to the category of facilities classified on environmental protection grounds (ICPE). They are controlled at the local level by a regional administration, DRIRE, who reports to the Ministry of Ecology, Energy, Sustainable Development and Territorial Planning and the Ministry of Economy, Industry and Labour.
Uranium mines are under the supervision of the Ministry of Ecology, Energy, Sustainable Development and Territorial Planning. Disposal of mining and milling residues is classified on environmental protection grounds.
Nuclear installations connected to National Defence activity are under the control of the Délégué à la sûreté nucléaire et à la radioprotection pour les activités et installations concernant la défense (DSND).
The IRSN is the technical support organisation (TSO) of the ASN, although the latter could call upon other institutions.