(1957), the RA-1 Enrico Fermi. The 335-MWe Atucha I designed by Germany's (Siemens) was completed in 1974. In 1984 the 600-MWe Embalse designed by Canadian CANDU started its commercial operation. In 1995 CNEA's functions where divided into newly created separate organizations such as the Nuclear Regulatory Authority (Autoridad Regulatoria Nuclear - ARN), which supervises nuclear safety in the country, and the Nucleoeléctrica Argentina - NASA, the company that operates the two completed nuclear power reactors. Today, CNEA mainly focuses on research and development of nuclear and related technologies. In 2001 the original 1956 Directory structure of a President and five members designated by the National Executive authority was reduced, eliminating four positions of the Directory by Decrees 1065–01 and 1066–01. On 2010 CNEA reopened the Enriched uranium plant at Pilcaniyeu inaugurated on 1983 but closed in the 1990s In 2014 692-MWe Atucha II, also a Siemens design, started operating besides Atucha I. Since then Argentina operates three pressurized heavy-water reactors (PHWR), that use heavy water as moderator and coolant and unenriched natural uranium as fuel, for the generation of electricity. Also in 2014, CNEA begun construction of the world's first small modular reactor (SMR), the CAREM-25 a small (25 MWe) pressurized water reactor (PWR) that unlike all previous power reactors in the country has been totally designed and developed domestically. It will use low-enrichment uranium as fuel and light water as coolant and moderator, a first for the country that traditionally used PHWRs designs. In December 2015 a new uranium enrichment plant to manufacture fuel for Argentina's nuclear plants, located in Pilcaniyeu, was inaugurated. The plant will use both gaseous diffusion and more modern laser techniques. Research, development, production and educational activities Although CNEA HQ is located in Buenos Aires city most of CNEA's activities are concentrated at three other sites Centro Atómico Constituyentes, San Martín, Buenos Aires province Its premises contain the first nuclear reactor in Latin America RA-1 that went critical on 17 January 1958. Its researchers not only pioneered the construction of research reactors in Argentina, but also formed its leading groups in metallurgy, physics and chemistry. The Tandar accelerator is a large tandem Van de Graaff type facility dedicated to nuclear physics, condensed matter physics and medical research. It houses facilities for the development and building of research nuclear reactors fuels. Its academic unit, the Instituto Sábato, focused in Materials Science grants Licenciado, MSc and PhD