Бразилияның құпия ядролық бағдарламасы және қарусыздану тарихы

In the 1970s and 1980s, during the military regime, Brazil had a secret program intended to develop nuclear weapons. The program was dismantled in 1990, five years after the military regime ended. Brazil is considered to possess no weapons of mass destruction but does have some of the key technologies needed to produce nuclear weapons. Brazil is one of many countries (and one of the last) to forswear nuclear weapons under the terms of the Non Proliferation Treaty.

In the 1950s, President Getúlio Vargas encouraged the development of independent national nuclear capabilities. During the 1970s and 1980s, Brazil and Argentina embarked on a nuclear competition. Through technology transfers from the West German company Kraftwerk Union (a subsidiary of Siemens), which did not require IAEA safeguards, Brazil pursued a covert nuclear weapons program known as the "Parallel Program," Sources have indicated that, a few years later, Brazilian cylinders of hexafluoride were transported to China containing natural uranium. They returned to Brazil in a container that, supposedly, carried porcelain purchased by the First Lady Dulce Figueiredo during the presidential trip. In 1987, President Sarney announced that Brazil had enriched uranium to 20%. In 1991, Brazil and Argentina renounced their nuclear rivalry. Brazil's enrichment technology development, and the plant itself, involved substantial discussions with the IAEA and its constituent nations. The dispute came down to whether IAEA inspectors would be allowed to inspect the machines themselves. The Brazilian government did not allow the inspection of the centrifugal cascade halls, arguing that this would reveal technological secrets (probably relating to the use of a magnetic lower bearing in place of the more common mechanical bearing). They also claimed that their technology is better than that of the United States and France, mainly because the centrifugal axis is not mechanical, but electromagnetic. Eventually, after extensive negotiations, agreement was reached that while not directly inspecting the centrifuges, the IAEA would inspect the composition of the gas entering and leaving the centrifuge. Then–U. S. Secretary of State Colin Powell stated in 2004 that he was sure that Brazil had no plans to develop nuclear weapons.

It is likely that Brazil has retained the technological capacity and knowhow to produce and deliver a nuclear weapon. If Brazil decided to pursue a nuclear weapon, the centrifuges at the Resende enrichment plant could be reconfigured to produce highly enriched uranium for nuclear weapons. Even a small enrichment plant like Resende could produce several nuclear weapons per year, but only if Brazil was willing to do so openly. The Brazilian Navy is currently developing a nuclear submarine fleet, and in 2007 authorised the construction of a prototype submarine propulsion reactor. In 2008, France agreed to transfer technology to Brazil for the joint development of the nuclear submarine hull.

The Aramar Experimental Center (Centro Experimental de Aramar) located in Iperó in the State of São Paulo, was inaugurated in 1988 as the first uranium only enrichment plant in Brazil. The facility is run by the CNEN and the Brazilian Navy. In addition to the Centrifuge Enrichment Plant, the facility also hosts an Isotopic Enrichment Laboratory and several Small Nuclear Centers (Pequenas Centrais Nucleares, or PCNs). The enrichment laboratories are under the National Safeguards control and national inspections are carried out by the Safeguards Division of CNEN.

The Cachimbo test site, officially named Brigadeiro Velloso Test Site (Campo de Provas Brigadeiro Velloso), is located in the State of Pará and covers 45,000 km2, an area larger than the Netherlands. It is within this military area that a 320 meters deep hole at the Cachimbo Mountain Range was a site for nuclear explosives tests. The shaft has been public knowledge since 1986 and was allegedly abandoned in September 1990, when President Fernando Collor de Mello used a small shovel to symbolically seal up the hole.

The Brazilian Army Technology Center (Centro Tecnológico do Exército, or CTEx) located in Guaratiba State of Rio de Janeiro, once worked on the project development of a plutonium producing research reactor. Known as 'The Atlantic Project', it was conducted by the Special Projects Institute – IPE (closed on October 1, 2001). Nowadays, CTEx performs scientific research and technology development in defence activities in strict respect to the Constitution of the Federative Republic of Brazil and international laws. The CTEx's nuclear research laboratories are under the national regulatory authority (Brazilian Nuclear Energy Commission CNEN) control and safeguards inspections verifications are performed jointly by the Brazilian Argentine Agency for Accounting and Control of Nuclear Materials (ABACC) and the International Atomic Energy Agency (IAEA).

The Department of Aerospace Science and Technology (Departamento de Ciência e Tecnologia Aerospacial, or DCTA) is a research facility located in São José dos Campos, in the State of São Paulo where nuclear research is also conducted.

The Resende Nuclear Fuel Facility (Fábrica de Combustíveis Nucleares, or FCN) is a nuclear enrichment facility located in Resende, in the State of Rio de Janeiro. The plant is managed by the Nuclear Industries of Brazil (Indústrias Nucleares do Brasil, or INB) and by the Brazilian Navy.

Brazil's 1988 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.