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Parchin Military Complex (Nuclear)

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In 2004, allegations surfaced that Iran was conducting secret experiments involving “high-explosive shaped charges with an inert core of depleted uranium” to test the characteristics of an implosion type nuclear weapon. 1 An ISIS analysis based on commercial satellite images referred to the site as a “logical candidate” for weaponization related research. 2 Iran denied the allegations and granted the IAEA restricted access to the complex in January and November 2005. 3 The Agency reported in February 2006 that inspectors “did not observe any unusual activities in the buildings visited,” and that “environmental samples did not indicate the presence of nuclear material.” 4 However, the IAEA was unable to visit all sites it wanted to inspect, and suspicions about the Parchin site persist. The exile group The National Council of Resistance of Iran has claimed that Iran constructed a sophisticated underground tunnel system at Parchin, where weaponization work continues. 5 These claims have never been substantiated.

In November 2011 the IAEA revealed that information from member states indicated the construction of “a large explosives containment vessel or chamber at the Parchin military complex in 2000 to conduct high explosive and hydrodynamic experiments related to the development of nuclear weapons.” 6 In spring 2013, Iran began laying asphalt around the Parchin site, leading to allegations that it was ‘sanitizing’ the area before another round of IAEA inspections. 7

In May 2022, one engineer was killed and another injured in an incident at a Parchin “research unit” that Iranian officials called an “industrial accident.”8


Uranium is a metal with the atomic number 92. See entries for enriched uranium, low enriched uranium, and highly enriched uranium.
Nuclear weapon
Nuclear weapon: A device that releases nuclear energy in an explosive manner as the result of nuclear chain reactions involving fission, or fission and fusion, of atomic nuclei. Such weapons are also sometimes referred to as atomic bombs (a fission-based weapon); or boosted fission weapons (a fission-based weapon deriving a slightly higher yield from a small fusion reaction); or hydrogen bombs/thermonuclear weapons (a weapon deriving a significant portion of its energy from fusion reactions).
International Atomic Energy Agency (IAEA)
IAEA: Founded in 1957 and based in Vienna, Austria, the IAEA is an autonomous international organization in the United Nations system. The Agency’s mandate is the promotion of peaceful uses of nuclear energy, technical assistance in this area, and verification that nuclear materials and technology stay in peaceful use. Article III of the Nuclear Non-Proliferation Treaty (NPT) requires non-nuclear weapon states party to the NPT to accept safeguards administered by the IAEA. The IAEA consists of three principal organs: the General Conference (of member states); the Board of Governors; and the Secretariat. For additional information, see the IAEA.


  1. “UN Atomic Agency Seeks to Visit Key Iranian Defense Site: diplomats,” AFP, 16 September 2004.
  2. David Albright and Corey Hinderstein, “Parchin: Possible Nuclear Weapons-Related Site in Iran,” Institute for Science and International Security, 15 September 2004, www.isis-online.org.
  3. “Iran Denies Any Nuclear Activity at Suspect Site Parchin,” AFP, 16 September 2004; “UN Inspectors Visit Sensitive Iranian Military Site,” AFP, 2 November 2005.
  4. “Implementation of the NPT Safeguards Agreement in the Islamic Republic of Iran,” International Atomic Energy Agency (IAEA), 27 February 2006, www.iaea.org.
  5. “Iran-Nuclear: Exile Says Iran Expands Tunnels for Nuclear Work,” National Council of Resistance of Iran, 17 September 2005, http://ncr-iran.org.
  6. David Albright and Robert Avagyan, “Taking Stock and Moving Forward on the Issue of the Parchin High Explosives Test Site,” Institute for Science and International Security, 25 January 2013, http://isis-online.org.
  7. ISIS reports, “Iran Laying Asphalt at the Suspect Parchin Site,” Institute for Science and International Security, 22 May 2013, http://isis-online.org; Stewart Bell, “Canada presses Iran on nuclear cover-up; Accuses regime of ‘sanitizing’ suspicious sites,” National Post, 6 June 2013.
  8. Maziar Motamedi, “One dead after ‘accident’ at Iran’s Parchin military complex,” Al Jazeera, 26 May 2022, www.aljazeera.com.


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