Constitution states in Article 21 that "all nuclear activity within the national territory shall only be admitted for peaceful purposes and subject to approval by the National Congress". Brazil acceded to the Nuclear Non-Proliferation Treaty on September 18, 1998, ratified the Geneva Protocol on 28 August 1970, the Biological Weapons Convention on 27 February 1973, and the Chemical Weapons Convention on 13 March 1996. Brazil signed the Treaty of Tlatelolco in 1967, making Brazil a nuclear-weapon-free zone. Brazil is also an active participant in the International Atomic Energy Agency and the Nuclear Suppliers Group, multinational agencies concerned with reducing nuclear proliferation by controlling the export and re-transfer of materials that may be applicable to nuclear weapon development. Brazil signed the Treaty on the Prohibition of Nuclear Weapons on September 20, 2017, but has not ratified it. See also Angra Nuclear Power Plant National Nuclear Energy Commission (CNEN) Brazilian-Argentine Agency for Accounting and Control of Nuclear Materials (ABACC) Argentinian nuclear weapons program References External links Official sites Indústrias Nucleares do Brasil – Brazilian Nuclear Industries Centro de Desenvolvimento da Tecnologia Nuclear – Center of Nuclear Technology Development – National Nuclear Energy Research Institute Instituto de Engenharia Nuclear – Nuclear Engineering Institute – Central-West Nuclear Sciences Regional Center Comissão Nacional de Energia Nuclear – National Nuclear Energy Commission – Manages Brazil's nuclear power plants Associação Brasileira de Energia Nuclear – Brazilian Association of Nuclear Energy Brazilian-Argentine Agency for Accounting and Control of Nuclear Materials Campo de Provas Brigadeiro Velloso – Cachimbo Test Site Departamento de Ciência e Tecnologia Aeroespacial – Brazilian Air Force - Aerospace Technology and Science Department Scientific sites Academic Sites Collection of Archival Documents on the Brazilian Nuclear Program – hosted by the Wilson Center Digital Archive (English) Weapons of mass destruction by country Weapons of Brazil Nuclear technology in Brazil Nuclear weapons programs