[en] The Nuclear Regulatory Authority was established as an autonomous body reporting to the Presidency of Argentina by Act known as the Nuclear Activity National Act, and is empowered to regulate and control the nuclear activity with regard to radiation and nuclear safety, physical protection and nuclear non-proliferation issues. This report details functions and competence of the regulatory body in order to preserve its own independent criterion regarding every aspect of radiological and nuclear safety, and the global strategy of the regulatory system, which are concentrated in the following basics aspects: issue of the corresponding standards; execution of regulatory inspections and audits to verify the compliance with granted licenses and authorisations; independent execution of analyses and studies for the licensing process of nuclear installations; development of technical and scientific aspects associated to radiological and nuclear safety; training of personnel involved in radiological and nuclear safety, either belonging to the Regulatory Body or those working in installations, which perform practices under control. The regulatory control activities are carried out with independence of technical opinions and decisions; administrative autarchy; legal capacity to act in the field of public and private rights, and qualified personnel. The regulatory system complies with the concept of safety culture and its development, and the commitment to nuclear power plants' safety is made clear in design or operation concepts giving priority to safety over economic rentability of the installations. The compliance with Maintenance Programs, In-service Inspection Programs and good operation practices are also part of the commitment. This paper describes the organisational structure of the regulatory body, its human resources, personnel qualification and training, and the necessary financial resources. The regulatory body issues and establishes the standards, which regulate and control nuclear activities. They are based on a set of fundamental concepts, which are a part of the performance approach philosophy sustained by the regulatory system concerning radiological and nuclear safety. Such concepts are developed in the report. Concerning emergencies, all regulated activities involving the use of ionizing radiation must have emergency procedures or plans, which are a condition within the process of licensing and controlling those activities. In the event of radiological emergencies in facilities other than nuclear power plants, the ARN will take the necessary steps through its own Radiological Emergency Intervention System (SIER). The Nuclear Emergency Intervention System (SIEN) acts in emergencies resulting from accidents in nuclear power plants in coordination with SIER. Lastly, the licensing system is described focusing on nuclear power plants and personnel licensing, regulatory inspections and audits, and regulatory actions that the regulatory body may take in relation with a particular installation in terms of requirements or recommendations, as well as the sanction regime. (author)