In 1985 Iran commissioned a Fuel Fabrication Laboratory (FFL) in cooperation with a French company, but did not declare the facility to the IAEA until 1993.[1] Between 1985 and 1993 Iran carried out undeclared fuel fabrication research at the laboratory and produced some fuel pellets using imported UF6.[2] Iran later irradiated these pellets at the Tehran Research Reactor and used them for plutonium separation experiments.[3] The IAEA reported in 2004 that the plant has a limited fuel pellet production capability.[4]

Sources:
[1] "Nuclear Sites, Esfahan," Institute for Science and International Security, www.isisnucleariran.org.
[2] "Implementation of the NPT Safeguards Agreement in the Islamic Republic of Iran," International Atomic Energy Agency (IAEA), 10 November 2003, www.iaea.org.
[3] "Implementation of the NPT Safeguards Agreement in the Islamic Republic of Iran," International Atomic Energy Agency (IAEA), 2 September 2005, www.iaea.org.
[4] "Implementation of the NPT Safeguards Agreement in the Islamic Republic of Iran," International Atomic Energy Agency (IAEA), 15 November 2004, www.iaea.org.