# Nuclear facilities in Iran

Iran's nuclear program is made up of a number of nuclear facilities, including nuclear reactors and various nuclear fuel cycle facilities.

## Anarak

Anarak, near Yazd, has a nuclear waste storage site.

## Arak

The Arak area has several industrial complexes, some with ties to the nuclear program, in particular the IR-40 reactor under construction and a heavy water production plant, both near Arak. In the late 1990s, one of these complexes may have manufactured a high-explosive test chamber transferred to Parchin, which the IAEA has asked to visit. The Arak area is also thought to hold factories capable of producing high-strength aluminum rotors for IR-1 centrifuges. The design of the reactor in Arak is very similar to those used to make plutonium for the production of nuclear weapons.
Arak was one of the two sites exposed by a spokesman for the People's Mujahedin of Iran in 2002. In August 2006, Iran announced the inauguration of the Arak plant for the production of heavy water. This reactor is intended to replace the life-expired 1967 Tehran Nuclear Research Center research reactor, mainly involved in the production of radioisotopes for medical and agricultural purposes, however the spent fuel of the heavy water production plant contains plutonium suitable for making the core of a nuclear bomb. In 2009 Iran granted the IAEA access to the facility, but did not allow them to see its detailed plans, thereby keeping its purpose unclear. It is believed that the completed reactor was capable of producing 9kg of weapons-grade plutonium, enough for up to two nuclear weapons, annually. Between 2011 and November 2013 the IAEA was denied access to the heavy water plant which had become operational. In 2014, under the Joint Comprehensive Plan of Action, the Arak reactor was to be redesigned and deemed incapable of producing large amounts of weapons grade plutonium. This was to be achieved by modifying the calandria, a metal lattice which holds specialized tubes that contain the fuel assemblies and allow the heavy water to go through them, holding natural uranium fuel and allowing the reactor to produce weapons-grade plutonium. The Modification involved filling the tubes with cement and installing a newly designed core that would not operate on natural uranium. The new design would operate on low-enriched uranium and would allow the reactor the continued production of radio isotopes for medical purposes without weapons-grade plutonium as a by-product. In January 2016, Iran reported that they had removed the original calandria from the core of the reactor, and Iranian officials stated that only the "cavities, and not its heart" had been filled with concrete. Also in January 2016, Iran propagated a photoshopped image of the reactor completely filled with cement, even though it had explicitly refused to carry out such an action, and this caused great confusion as to what had been done. Despite the preventative procedures, in February, and again in November of that same year, Iran exceeded its allowed limit of stockpiled Heavy Water. Iran also transferred over 80 metric tonnes of Heavy Water beyond its borders to Oman, thereby maintaining control over these resources without technically breaching the agreement. In 2017, the facility was renamed the Khondab Heavy Water Research Reactor. On 22 January 2019, the head of Iran’s Atomic Energy Organization (AEOI), Ali Akbar Salehi gave an interview on Iran’s Channel 4 TV in which he stated that Iran had covertly imported a second set of tubes, identical to those which were filled with cement, allowing Iran to build a duplicate of the original calandria for the Arak reactor. Iran notified the IAEA that it intended to bring the reactor online in 2026.

## Ardakan

The possible existence of a nuclear-related facility near Ardakan (also spelled Ardekan or Erdekan) was first reported on 8 July 2003, by the National Council of Resistance of Iran. Mohammad Ghannadi-Maragheh, Vice President for Nuclear Fuel Production of the Atomic Energy Organization of Iran (AEOI), said in September 2003 that the facility was a uranium mill with an annual capacity of 120,000 metric tonnes of ore and an annual output of 50 metric tons of uranium. Iran told the International Atomic Energy Agency (IAEA) that the facility would be hot tested July 2004, producing 40 to 50 kg of yellow cake, but as of 2008 Iran had provided no further information to the IAEA on its operation.

## Bonab

The Atomic Energy Research Center at Bonab is investigating the applications of nuclear technology in agriculture. It is run by the AEOI.

## Bushehr

The Bushehr Nuclear Power Plant is located 17 kilometres (11 mi) south-east of the city of Bushehr, on the Persian Gulf. Construction started in 1975 but was halted in July 1979 following the 1979 Iranian Revolution. The reactor was damaged by Iraqi air strikes during the Iran-Iraq war in the mid-1980s. Construction resumed in 1995, when Iran signed a contract with Russian company Atomstroyexport to install into the existing Bushehr I building a 915 MWe VVER-1000 pressurized water reactor. In December 2007 Russia started delivering nuclear fuel to the Bushehr nuclear power plant. The construction was completed in March 2009.
On 13 August 2010, Russia announced that fuel would be loaded into the plant beginning on 21 August, which would mark the beginning of the plant being considered a nuclear facility. Within six months after the fuel loading, the plant was planned to be fully operational. Tehran and Moscow have established a joint venture to operate Bushehr because Iran has not yet had enough experience in maintaining such installations. However, Iran may begin almost all operational control of the reactor within two or three years.
On 23 September 2013, operational control of Bushehr was transferred to Iran. and in November 2014 Iran and Russia signed an agreement to build two new nuclear reactors at the Bushehr site, with an option of six more at other sites later. Construction formally started on 14 March 2017.

## Chalus

In 1995, Iranian exiles living in Europe claimed Iran was building a secret facility for building nuclear weapons in a mountain 20 kilometres from the town of Chalus. In October 2003 Mohamed ElBaradei announced that "In terms of inspections, so far, we have been allowed to visit those sites to which we have requested access". It therefore appears the allegations about the Chalus site were unfounded.

## Darkovin

Iran declared on 6 March 2007 that it has started construction of a domestically built nuclear power plant with capacity of 360 MW in Darkovin, in southwestern Iran.

## Fordow

Fordow, dug deep into a mountain near the city of Qom, and located approximately 160km south of Tehran, is the site of an underground uranium enrichment facility at a former Islamic Revolutionary Guard Corps missile base. After Natanz, Fordow is the second pilot enrichment plant belonging to Iran, and is considered Iran's best sheltered nuclear site as it is believed to be buried up to 80m deep and has been described as being about three floors below ground.
Existence of the then-unfinished Fordow Fuel Enrichment Plant (FFEP) was disclosed to the IAEA by Iran on 21 September 2009, but only after the site became known to Western intelligence services. Western officials strongly condemned Iran for not disclosing the site earlier; U.S. President Barack Obama said that Fordow had been under U.S. surveillance. In its initial declaration, Iran stated that the purpose of the facility was the production of UF$_6$ enriched up to 5% U-235, and that the facility was being built to contain 16 cascades, with a total of approximately 3000 centrifuges. The facility consists of two enrichment halls containing the centrifuges. Iran argues that this disclosure was consistent with its legal obligations under its Safeguards Agreement with the IAEA, which Iran claims requires Iran to declare new facilities 180 days before they receive nuclear material. However, the IAEA stated that Iran was bound by its agreement in 2003 to declare the facility as soon as Iran decided to construct it. Later, in September 2011, Iran said it would move its production of 20% LEU to Fordow from Natanz, and enrichment started in December 2011. The Fordow plant was constructed at a depth of 80–90 m under the rocks. According to the Institute for Science and International Security. In July 2015, Iran agreed to the Joint Comprehensive Plan of Action (JCPOA) which dictated that Iran was to cease all uranium enrichment for 15 years, with the exception of limited stable isotope production, and was to convert the facility into a scientific research center. The International Atomic Energy Agency (IAEA) initially reported that Iran was in compliance with its nuclear commitments;. According to the IAEA, Iran initially complied, however, a surprise inspection in February 2023 revealed that Iran had violated the agreements by covertly modifying the facility's design to enable further uranium enrichment. In March 2023, the IAEA reported that it had discovered uranium which had been enriched to 83.7% purity in Fordow, while research reactors require enrichment of only 20%, and a nuclear weapon requires enrichment of 90%. By august 2024, Iran had increased the number of centrifuges in Fordow and had installed at least 10 cascades (clusters) of advanced IR-6 centrifuges, enabling further uranium enrichment.

## Isfahan

The Nuclear Technology Center of Isfahan is a nuclear research facility that currently operates a Miniature Neutron Source Reactor supplied by China. It is run by the AEOI.
The Uranium Conversion Facility (UCF) at Isfahan converts yellowcake into uranium hexafluoride. As of late October 2004, the site is 70% operational with 21 of 24 workshops completed. There is also a Zirconium Production Plant (ZPP) located nearby that produces the necessary ingredients and alloys for nuclear reactors. There is also a Fuel Plate Fabrication Plant (FPFP) at Isfahan.
As of 2022 another new nuclear construction development was built in suburban Isfahan .

## Karaj

The Center for Agricultural Research and Nuclear Medicine at Hashtgerd was established in 1991 and is run by the AEOI.

## Lashkar Abad

Lashkar Abad is a pilot plant for isotope separation. Established in 2002, the site was first exposed by Alireza Jafarzadeh in May 2003, which led to the inspection of the site by the IAEA. Laser enrichment experiments were carried out there, however, the plant has been shut down since Iran declared it has no intentions of enriching uranium using the laser isotope separation technique. In September 2006, Alireza Jafarzadeh claimed that the site has been revived by Iran and that laser enrichment has been taking place at this site.

## Lavizan

(35°46′23″N 51°29′52″E﻿ / ﻿35.77306°N 51.49778°E﻿ / 35.77306; 51.49778) All buildings at the former Lavizan-Shian Technical Research Center site were demolished between August 2003 and March 2004. Environmental samples taken by IAEA inspectors showed no trace of radiation. The site is to be returned to the City of Tehran.
According to Reuters, claims by the US that topsoil has been removed and the site had been sanitized could not be verified by IAEA investigators who visited Lavizan:
   Washington accused Iran of removing a substantial amount of topsoil and rubble from the site and replacing it with a new layer of soil, in what U.S. officials said might have been an attempt to cover clandestine nuclear activity at Lavizan.
   Former U.S. ambassador to the IAEA, Kenneth Brill, accused Iran in June of using "the wrecking ball and bulldozer" to sanitize Lavizan prior to the arrival of U.N. inspectors.
   But another diplomat close to the IAEA told Reuters that on-site inspections of Lavizan produced no proof that any soil had been removed at all.

### Lavizan-3

On 24 January 2015, Iranian dissidents of the National Council of Resistance of Iran claimed a covert uranium enrichment facility, called Lavizan-3, existed just outside Tehran. The NCRI's claims were subsequently rejected by nuclear proliferation researchers such as Jeffrey Lewis based on further analysis of satellite imagery and the discovery that NCRI had portrayed a commercial company's reinforced door advertisement as part of the alleged nuclear facility. A report of the Federation of American Scientists portrayed the allegations as "debunked" in 2017. NCRI's allegations were made in the weeks before final agreements were reached between Iran and the USA over the JCPOA, which the group opposed.

## Natanz

The Natanz nuclear facility is located in old Kashan-Natanz near the village of Deh-Zireh, outside the city of Qom, about 40km southeast of Kashan and approximately 160km north of Esfahan. It is Iran's primary uranium enrichment site, and consists of both the Fuel Enrichment Plant (FEP) and the Pilot Fuel Enrichment Plant (PFEP).
The Fuel Enrichment Plant (FEP) covers 100,000 square meters that is built 8 meters underground and protected by a concrete wall 2.5 meters thick, itself protected by another concrete wall. In 2004, the roof was hardened with reinforced concrete and covered with 22 meters of earth. The complex has been described as being about three floors below ground, and consists of three underground buildings, two of which were built to house 50,000 centrifuges, about 14,000 of which are installed and about 11,000 are in operation, and six buildings above-ground, including two 25,000 square meter halls used for the assembly of gas centrifuges, as well as a number of administrative buildings.
The Pilot Fuel Enrichment Plant (PFEP) is located within the complex which houses the FEP in a number of buildings above ground, and serves as a facility for research, development, testing and pilot enrichment. The facility began operation in 2003. It consists of one hall which is divided into a section for research and development and another for production, and can house 6 cascades of 164 centrifuges each. The PFEP is used by Iran to test new centrifuge designs. IAEA reports have documented the presence of IR-1, IR-2m, IR-3, IR-4, IR-5, IR-6, and IR6s centrifuges in the facility, and as of November 2022 Iran was involved in testing IR-8, IR-8b and IR-9 centrifuges at the site.
In 2010 an Iranian announcement confirmed by the IAEA stated that the PFEP had begun to enrich uranium hexafluoride (UF6) to 20%. Starting in July of that year, Iran has been feeding UF6 into two interconnected IR-1 cascades of 164 centrifuges each, in the production hall. As of may 2013, Iran had produced 177.8 kg of UF6 enriched up to 20% in the PFEP. This development heightened concerns over a potential nuclear breakout, as a large stockpile of Uranium enriched to 20% would cut the time it takes to produce weapons-grade uranium by more than half. In April 2021 Iran began enriching UF6 to 60% at the PFEP, using IR-4 and IR-6 centrifuges.
This once secret site was one of the two exposed by Alireza Jafarzadeh in August, 2002.
On 21 February 2003, IAEA Director General Mohamed ElBaradei visited the site and reported that 160 centrifuges were complete and ready for operation, with 1,000 more under construction at the site. During 2003, IAEA inspectors found particles of highly enriched uranium (HEU) at the Natanz facility. Iran claimed the material was contaminated by the supplier country, though Iran did not name it. In accordance with Code 3.1 of the Subsidiary Arrangements to Iran's safeguards agreement that were in force up to that time, Iran was not obligated to declare the Natanz enrichment facility until six months before nuclear material was introduced into the facility. After the election of Mahmoud Ahmadinejad as president of Iran in August 2005, the regime reversed its cooperative stance with the IAEA, on 10 January 2006 Iran removed he IAEAs safeguarding seals from the facility and resumed uranium enrichment, introducing uranium hexafluoride gas (UF6) into centrifuges both in the FEP and in the PFEP. According to the IAEA, in 2009 there were approximately 7,000 centrifuges installed at Natanz, of which 5,000 were producing low enriched uranium. According to Iran Watch, as of October 2024, the Natanz Fuel Enrichment Plant (FEP) was operating 36 cascades (clusters) of IR-1 centrifuges and 30 more advanced centrifuges of the IR-2m, IR-4 and IR-6 models, while the Pilot Fuel Enrichment Plant (PFEP) at Natanz was operating nearly 1000 advanced centrifuges of the IR-4 and IR-6 models, which are enriching uranium to 60%. Additionally, there are several thousand IR-1 centrifuges in storage in Natanz, as well as a number of powerful centrifuges under development which also contribute to the growth of Iran's stockpile of enriched uranium. The accumulation and eventual deployment of large numbers of centrifuges would allow Iran to accelerate the production of nuclear fuel, and potentially allow further enrichment of weapons-grade uranium.
In July 2020, the Atomic Energy Organization of Iran released photos of a building, presumed to be a centrifuge assembly facility, after a recent explosion. An unnamed Middle Eastern intelligence official later claimed that damage to the facility was caused by an explosive device.
On 28 October 2020, the Center for Nonproliferation Studies released satellite images acknowledging that Iran had begun the construction of an underground plant near its nuclear facility at Natanz. In March 2021, Iran restarted enriching uranium at the Natanz facility with a third set of advanced nuclear centrifuges in a series of violations of the 2015 nuclear accord. On 10 April, Iran began injecting uranium hexafluoride gas into advanced IR-6 and IR- 5 centrifuges at Natanz, but on the next day, an accident occurred in the electricity distribution network. On 11 April, IRNA reported that the incident was due to a power failure and that there were no injuries nor any escape of radioactive material. Further details eventually emerged that it was actually Israel that orchestrated the attack. On 17 April, Iranian state television named 43-year-old Reza Karimi from Kashan as a suspect for the blackout, stating that he had fled the country before the sabotage happened. In July 2021, Iran reportedly limited inspectors' access to the plant.

## Parchin

Parchin Military Complex (35°31′N 51°46′E﻿ / ﻿35.52°N 51.77°E﻿ / 35.52; 51.77) is located approximately 20 kilometers southeast of downtown Tehran. According to BBC Parchin "is dedicated to the research, development and production of ammunition, rockets and explosives", though other reports suggest that it is also used for the development of Iran's nuclear arsenal.
In 2004, the construction of a large explosives containment vessel raised suspicions regarding Parchin's role in Iran's nuclear programme. The IAEA was initially given access to Parchin on 1 November 2005, and it took environmental samples: inspectors did not observe any unusual activities in the buildings visited at the time, and the results of the analysis of environmental samples did not indicate the presence of nuclear material. Iran presented Parchin as a facility for the testing and manufacturing of conventional explosives, though doubt would eventually be cast on this claim; IAEA safeguards inspectors were looking not for evidence of nuclear material, but of the kind of explosives testing consistent with nuclear weapons research and development. In November 2011, the IAEA reported that it had "credible" information that Parchin was used for implosion testing, and that it was the site of activities aimed at developing a nuclear weapon. In February 2012 the IAEA sought additional access to Parchin, which Iran did not grant. In June 2016, despite Iranian denial of nuclear activity in Parchin the previous year, IAEA investigators reported to the Wall Street Journal that they had found in December 2015 traces of uranium at the Parchin facility, establishing the first physical evidence of a nuclear weapons programme at the missile complex site. Based on intelligence about activity in the Parchin military complex in 2024, it was assessed that Iran had resumed its pursuit of nuclear weapons. This activity included including computer modeling, metallurgy, and explosive research, the combination and nature of which cannot be explained plausibly unless they were used to develop Iran's nuclear arsenal. In October 2025, Taleghan 2, a highly classified nuclear weapons research facility, located within the Parchin Military Complex in Iran, was destroyed in an airstrike conducted by the IDF. The facility was reportedly operational at the time of the attack.

## Saghand

Saghand is Iran's first uranium ore mine that became operational in March 2005. It is located at 32°18′47″N 55°31′48″E﻿ / ﻿32.313°N 55.530°E﻿ / 32.313; 55.530. The deposit is estimated to contain 3,000 to 5,000 tons of uranium oxide at a density of about 500 ppm over an area of 100 to 150 square kilometers.

## Tehran Nuclear Research Center

The Tehran Nuclear Research Center (TNRC) brings together a number of Iranian nuclear research facilities, including the Jabr Ibn Hayan Multipurpose Laboratories, the Molybdenum, Iodine, and Xenon (MIX) Radioisotope Production Facility, the Radiochemistry Laboratories, and the Tehran Research Reactor (TRR). The TNRC has been the site of multiple undeclared nuclear activities, encompassing plutonium separation and purification, uranium conversion, laser enrichment, and polonium production. These activities, many of which have direct applications in nuclear weapons development, have drawn international scrutiny, particularly due to Iran’s failure to disclose them fully to the International Atomic Energy Agency (IAEA). The presence of advanced research infrastructure within the TNRC has further raised concerns about Iran’s nuclear intentions, as the facility’s capabilities extend beyond civilian applications and into sensitive areas relevant to weapons proliferation.

### Tehran Research Reactor

The Tehran Research Reactor (TRR) 35°44′18″N 51°23′17″E﻿ / ﻿35.73833°N 51.38806°E﻿ / 35.73833; 51.38806 was a focal point in the negotiations leading to the 2015 Joint Comprehensive Plan of Action (JCPOA) due to its dual-use potential. While the reactor was primarily designated for medical isotope production, its capability to operate with highly enriched uranium (HEU) raised concerns about its possible military applications. The facility’s ability to produce materials relevant to nuclear weapons development made it a subject of international scrutiny and regulatory measures within the framework of the nuclear agreement.
The reactor was supplied by the United States under the Atoms for Peace program. The 5-megawatt pool-type nuclear research reactor became operational in 1967 and initially used highly enriched uranium fuel. Light water is used as moderator, coolant and shielding. The TRR core lattice is a 9×6 array containing Standard Fuel Elements (SFEs), Control Fuel Elements (CFEs), irradiation boxes (as vertical tubes provided within the core lattice configuration for long term irradiation of samples and radioisotope production) and graphite boxes (as reflectors).
After the Iranian Revolution, the United States cut off the supply of highly enriched uranium (HEU) fuel for the TRR, which forced the reactor to be shut down for a number of years. Due to the nuclear proliferation concerns caused by the use of HEUs and following Reduced Enrichment Research and Test Reactor (RERTR) Programs, Iran signed agreements with Argentina's National Atomic Energy Commission to convert the TRR from highly enriched uranium fuel to low-enriched uranium, and to supply the low-enriched uranium to Iran in 1987–88. TRR core was converted to use Low Enriched Uranium (LEU) fuels in 1993. On the other hand, during the same time period, between 1988 and 1993, Iran conducted undeclared experiments in uranium reprocessing at the TRR, and between 1991-1993 separated approximately 100 milligrams of plutonium, an amount much higher than the 200 micrograms which it declared. Additionally, Iran attempted to extract the Polonium-210 isotope by irradiating two bismuth targets, which together with beryllium serves as a neutron initiator in a number of nuclear weapon designs. Although Iran stated that these actions were experiments for the feasibility of radioisotope thermoelectric generator production, the IAEA expressed doubt regarding Iran's declared intentions.
Fuel elements of TRR are now plate-type U$_3$O$_8$-Al with approximately 20% enrichment. In February 2012, Iran loaded the first domestically produced fuel element into the Tehran Research Reactor.
Standard fuel elements of TRR have 19 fuel plates, while CFEs have only 14 fuel plates to accommodate the fork-type control rods. Control of the reactor is accomplished by the insertion or removal of safety and regulating absorber plates, which contain Ag–In–Cd alloy and stainless steel, respectively. The negative temperature coefficient of reactivity of the system provides additional passive nuclear safety.
The reactor core is immersed in either section of a two-section, concrete pool filled with water. One of the sections of the pool contains an experimental stall into which beam tubes and other experimental facilities converge. The other section is an open area for bulk irradiation studies. The reactor can be operated in either section.
The reactor experimental facilities in the stall end are as follow:
* Two pneumatic rabbit tubes (for short term irradiation of samples)
* One graphite thermal column
* One 12"×12" beam tube
* Four 6" diameter beam tubes
* One 8" diameter beam tube
* One 6" diameter through tube
TRR core cooling is accomplished by gravity flow of pool water at nominal rate of 500 m$^3$/hr through the reactor core, grid plate, plenum and into the hold-up tank from where it is pumped through the shell of the heat exchanger and then back into the pool.

## Yazd

Yazd Radiation Processing Center, established in 1998 by AEOI, is equipped with a Rhodotron TT200 accelerator, made by IBA, Belgium, with outputs of 5 and 10MeV beam lines and a maximum power of 100 kW. As of 2006 the centre is engaged in geophysical research to analyze the mineral deposits surrounding the city and was expected to play an important role in supporting the medical and polymer industries.
In 2016, an AEOI spokesman stated that AEOI plans to build at least 10 multipurpose gamma irradiation plants for radiation sterilization of disposable medical products, and that Iran needs 5 electron beam accelerators for wastewater treatment and 10 for material modification.