Gas centrifuge enrichment plant for the production of uranium hexafluoride (UF6) enriched up to 20% U-235 and the production of UF6 enriched up to 5% U-235; designed to contain up to 2,976 gas centrifuges in 16 cascades divided between two units; all of the installed centrifuges are IR-1 machines; was developed covertly by Iran and first publicly revealed in September 2009 by the United States, the United Kingdom, and France; first brought into operation in 2011.

Is reportedly located about 95 kilometers southwest of Tehran off the Qom to Aliabad highway on the grounds of a former Islamic Revolutionary Guard Corps (IRGC) missile site; reportedly consists of three major tunnel entrances leading to underground enrichment halls; reportedly protected by one S-200 and two HAWK air defense sites; reportedly built with cooperation from the Passive Defense Organization and operated by the Atomic Energy Organization of Iran (AEOI); reportedly protected by the Islamic Revolutionary Guard Corps.

Entities reported to have been involved in construction at the site include:

Ashtian Tablo
Bals Alman
Bargh Azaraksh
Fulmen Company
Fulmen Group
Iran Transfo Company
Iranian Offshore Engineering & Construction Co (IOEC)
Khatam-al Anbiya Construction Headquarters (KAA)
Raka
Saman Tose'e Asia

Entities reported to have been involved in procurement for the site include:

Eyvaz Technic
Fulmen Company
Fulmen Group
Safa Nicu
Test Tafsir

Individuals reported to have been involved in research at the site include Morteza Behzad.