An ongoing concern in the area of nuclear safety and security is the possibility that terrorist organizations may attack facilities possessing radioactive material in order to cause widespread radioactive contamination or to construct nuclear weapons. Such facilities may include nuclear power plants, civilian research reactors, uranium enrichment plants, fuel fabrication plants, uranium mines, and military bases where nuclear weapons are stored. The attack threat is of several general types: commando-like ground-based attacks on equipment which if disabled could lead to a reactor core meltdown or widespread dispersal of radioactivity, external attacks such as an aircraft crash into a reactor complex, or cyber attacks.[1]
The United States 9/11 Commission has said that nuclear power plants were potential targets originally considered for the September 11, 2001 attacks. If terrorist groups could sufficiently damage safety systems to cause a core meltdown at a nuclear power plant, and/or sufficiently damage spent fuel pools, such an attack could lead to widespread radioactive contamination. The Federation of American Scientists have said that if nuclear power use is to expand significantly, nuclear facilities will have to be made extremely safe from such attacks. New reactor designs have features of passive nuclear safety, which may help. In the United States, the Nuclear Regulatory Commission carries out "Force on Force" exercises at all nuclear power plant sites at least once every three years.[1]
Nuclear power plants become preferred targets during military conflict and, over the past three decades, have been repeatedly attacked during military air strikes, occupations, and invasions.[2] Various acts of civil disobedience since 1980 by the peace group Plowshares have demonstrated extraordinary breaches of security at nuclear weapons plants in the United States. The National Nuclear Security Administration has acknowledged the seriousness of the 2012 Plowshares action. Non-proliferation policy experts have questioned "the use of private contractors to provide security at facilities that manufacture and store the government's most dangerous military material".[3] Nuclear weapons materials on the black market are a global concern,[4][5] and there is concern about the possible detonation of a dirty bomb by a militant group in a major city.[6][7]
The number and sophistication of cyber attacks is on the rise. Stuxnet is a computer worm discovered in June 2010 that is believed to have been created by the United States and Israel to attack Iran's uranium enrichment facilities. It caused major damage to the facility by operating the centrifuges in erratic and unintended ways.[8] The computers of South Korea's nuclear plant operator (KHNP) were hacked in December 2014. The cyber attacks involved thousands of phishing emails containing malicious code, and information was stolen.[9] Neither of these attacks directly involved nuclear reactors or their facilities.