Nuclear Power in Iran

(Updated November 2014)

  • A large nuclear power reactor is operating in Iran, after many years construction, and a second is planned.
  • The country also has a major program developing uranium enrichment, which was concealed for many years.
  • Iran has not suspended its enrichment-related activities, or its work on heavy water-related projects, as required by the UN Security Council.

Iran produced 240 billion kWh gross in 2011, giving per capita consumption of about 3200 kWh/yr. Its 2011 electricity production comprised 160 TWh from gas, 67 TWh from oil, both of which it has in abundance, 12 TWh from hydro which is less reliably available, and the first contribution from nuclear power. Demand is growing about 4% per year, and Iran trades electricity with Afghanistan, Armenia, Azerbaijan, Iraq, Pakistan, Syria, Turkmenistan and Turkey. Net export is about 7 TWh/yr.

In mid-2013 generating capacity was 68 GWe. The country plans to boost generating capacity to 122 GWe by 2022, with substantial export potential. 

Nuclear power developments

In 1957 a civil nuclear program was established under the US Atoms for Peace program.

In 1974 the Shah announced a target of 23,000 MWe of nuclear capacity to free up oil and gas for export. Preliminary agreements with Siemens KWU and Framatome for four nuclear power plants were signed.

In 1975 construction of two 1,293 MWe (gross) PWR units was started 18 km south of Bushehr in Bushehr province on the Persian Gulf by Siemens KWU, based on the Biblis B reactor in Germany. The contract was actually signed in mid-1976 and some $3 billion paid. After the Islamic revolution, further payment was withheld and work was abandoned early in 1979 with unit 1 substantially complete and unit two about half complete. The plant was damaged by Iraqi air strikes in 1984-88.

At Darkhovin, on the Karun River close to the Iraq border, there were also two French 910 MWe units which in January 1979 had just started construction under a $2 billion October 1977 contract with Framatome. These were cancelled in April 1979, and their engineering components were retained in France, being built there as Gravelines C, units 5&6, which came on line in 1985. In 1992, the Islamic Republic of Iran signed an agreement with China to build two 300 MWe reactors at the Darkhovin site, similar to those at Qinshan in China and Chashma in Pakistan, but China withdrew before construction started.

The original 1974 plan called for construction of four units at Bushehr, then two units at Isfahan, 340 km south of Teheran, to come on line in mid-1980s and two units at Saveh, near Teheran. The Isfahan and Saveh units were to be 1300 MWe class KWU types with dry cooling using two 260 m tall and 170 m wide dry cooling towers. They would have been the first large nuclear plants to use dry cooling.

In 2013 and 2014 senior officials were talking of a target of 20 GWe nuclear by 2020. AEOI cites parliamentary approval for this capacity target (if not deadline) as being binding on it.

Bushehr 1

An agreement between the Iranian and Russian governments on building a two-unit nuclear power plant was signed in Moscow in August 1992. This covered both construction and operation of the plant. The Atomic Energy Organization of Iran (AEOI) insisted that the project should make full use of the structures and equipment already at Bushehr. In 1994, Russia's Minatom agreed with AEOI to complete unit 1 of Bushehr nuclear power plant with a VVER-1000 unit, using mostly the infrastructure already in place, and a contract was signed in January 1995.

The Russian contractor faced major challenges and an approach to Germany for help was rejected, leaving it to certify and document a lot of unfamiliar bits of equipment. All the main reactor components were fabricated in Russia under a construction contract with Atomstroyexport, based on the V-320 design, but designated V-446 signifying adaptation to the Siemens parts and also high seismic rating. The 1000 MWe (915 MWe net) plant constructed by Atomstroyexport had a succession of construction and start-up delays, and as late as 2007 the project was almost abandoned. All work was under IAEA safeguards and operation is also under safeguards. Some 47,000 pieces of equipment passed scrutiny by Atomstroyexport, another 11,000 seemed to be in working order but the specifications and manuals to them were missing and needed to be restored. Meanwhile, since the 1975 construction start, the nuclear safety requirements in Russia and internationally had become more stringent. Some German parts being integrated into the Russian design therefore required significant upgrades. According to a local report, 24% of the parts are German in origin, 36% are Iranian-made while 40% are Russian-made. 

The original plans had two desalination plants, each of 100,000 m3/day capacity, linked to the reactors, but the Russian project dropped these. It appears that they were added later, and the first phase was commissioned in August 2014. With phase 2, the plant will provide 20% of the potable water for Bushehr city.

After two years delay due to Iran's reluctance to agree to returning used fuel to Russia without being paid for it, two agreements were signed early in 2005 covering both supply of fresh fuel for the new Bushehr nuclear reactor and its return to Russia after use. The Russian agreement means that Iran's nuclear fuel supply is secured for the foreseeable future, removing any justification for enrichment locally.*

* Russia's Atomstroyexport by the end of January 2008 had delivered the 163 fuel assemblies for the initial core of Bushehr plus 17 reserve ones – 82 tonnes of fuel in total. The fuel is enriched 1.6% to 3.62% and is under full international safeguards. The Russian government had withheld supply as negotiations over Iran's uranium enrichment activities proceeded. As of September 2009 the reactor was reported to be 96% complete and testing had begun earlier in the year. Fuel loading was expected by October, with first power soon after, but further delays pushed this to 2010, then to 2011. Atomstroyexport delivered the first one-third core reload by air from TVEL in May 2011 – about 30 tonnes of fuel which will be needed after about 18 months operation.

The reactor was finally due to start up in February 2011 and to "reach first power" in April, and fuel had been loaded by the start of December. However, late in February before starting up it was found that a pump had failed and possibly shed metal particles into the primary cooling system, which could damage the fuel elements. The fuel therefore had to be unloaded, checked and cleaned, and any debris removed from the pressure vessel. The pump concerned was one supplied in the 1970s and was part of the old equipment required to be used under the terms of the Russian contract. Eventually the reactor started up on 8 May 2011, was grid connected early in September 2011, and was expected to enter commercial operation about April 2012, then May 2013, and finally did so in September 2013.* 

* In October 2012 the fuel assemblies were unloaded and put into the spent fuel pond after only two months irradiation, apparently due to indications of some metal fragments in the cooling water remaining from the earlier pump problem. The reactor was reloaded and restarted in December. However, apparently the IAEA was not fully informed of the situation, which caused some international concern about what was happening and why. It was reconnected to the grid in January 2013 and handed over to Iran in September 2013, making it effectively in commercial operation.

AEOI says it will remain under Russian guarantee for another two years from September 2013 “and a number of Russian experts will remain in place to give advice and technical assistance”.* The preliminary agreement states that the first reactor of Bushehr nuclear power plant would be operated by a 50-50 Russian-Iranian joint venture during the one-year warranty period. In August 2010 it was agreed that this JV would operate the plant for up to three years before Atomstroyexport gradually withdrew. However, in September 2011 after grid connection, Rosatom said: "According to the Iranian legislation, only a national company can be an operator of the nuclear power plant", hence Russian specialists would be invited to work under a contract to be awarded by the Nuclear Power Production and Development Company of Iran (NPPD), with their numbers gradually reducing. In May 2012 the first deputy director general of Rosenergoatom Vladimir Asmolov said that all operations related to the reactor equipment control and operation were being carried out by Russian specialists. “There is not a single Iranian operator at Bushehr,” he said. He explained that the Iranian party had signed an agreement with a Rosatom affiliate, Atomtechexport (ATE), which operates the reactor unit. However, Iranian operators have been trained in Russia.

* A Russian report in January 2014 said that 270 employees of Atomtechexport were insured to work in Iran to support “organization of Bushehr nuclear power plant operation, repair and render engineering support to the facility, including the equipment integration.”

Earthquakes in April of 7.7 magnitude and lesser ones in May 2013 are reported to have caused cracks in concrete at Bushehr, but without safety significance. The plant is designed to withstand magnitude 8 quakes. Iran reported to the IAEA that the quakes had caused no damage. In June 2013 the reactor remained shut down due to generator problems, and had apparently been out of action for several months.

The anticipated 7 TWh/yr from the Bushehr reactor frees up about 1.6 million tonnes of oil (11 million barrels) or 1800 million cubic metres of gas per year, which can be exported for hard currency. In 2013 Iran’s Energy Minister said that it saved some $2 billion per year in oil and gas.

Nuclear power reactors 

  type MWe gross, net construction start commercial operation planned close
Bushehr 1 VVER-1000/446 1000, 915 1975, 1994 Sept 2013  
Total (1)   915 MWe net      

Despite high-profile and serious disagreements with IAEA over uranium enrichment, the IAEA continues full involvement with Iran on nuclear safety issues, focused on Bushehr. However, Iran is not a party to the IAEA Convention of Nuclear Safety – it is the only country with an operating nuclear reactor that is not a party to it.

Further nuclear power capacity

The AEOI originally said that construction of a second unit in Bushehr province was to proceed and that feasibility studies for a further 5000 MWe had been ordered. Then in December 2008 it said that the next step would be two new 1000 MWe plants nearby, with Bushehr unit 2 shelved. In May 2012 a 1000 MWe Bushehr unit 2 was again announced, with construction involving foreign contractors to begin by March 2014. There was further public mention in August, September and November 2013. In February 2014 AEOI gave the starting date as April 2014 or in the following months. Russia obtained agreement from AEOI that this would be built from scratch, without trying to integrate it into the German-built structure. It is likely to be a similar VVER-1000 (V-392) without the special adaptations to Siemens design. Russia has noted that intergovernmental agreements would need updating and refining.

The Nuclear Power Production & Development Company of Iran (NPPD), closely associated with AEOI, had invited bids in 2007 to construct two large third-generation PWR nuclear reactors – 1000 to 1600 MWe each – near Bushehr, to come on line about 2016. It is not known whether any bids were received then, but anything there would now be a Rosatom VVER project. Russia is the only envisaged source of nuclear power technology, as various government spokesmen set forth hopes and needs.

In March 2014 AEOI said it had agreed with Rosatom to build at least two more 1000 MWe nuclear reactors at Bushehr. AEOI said that the agreement is part of a 1992 deal between the two countries on further nuclear cooperation. Technical and commercial issues were to be worked out, but Iran’s ambassador in Moscow earlier said that the plant, along with other goods, would be bartered for oil (which is subject to UN trade sanctions). A government-level protocol on building two further reactors was signed in April 2014. In November 2014 a further protocol to the original 1992 agreement was signed by Rosatom and AEOI, covering construction of four VVER reactors on a turnkey basis at Bushehr, and four more at another site yet to be determined. These are all to involve maximum local engineering content, and will be fully under IAEA safeguards. As usual with its foreign projects, Rosatom will supply all the fabricated nuclear fuel for the eight units “for the whole period of the nuclear power plant operation” and will take all used fuel back to Russia for reprocessing and storage. (Article 3 of protocol.) However, under the terms of the 1992 agreement, Rosatom and AEOI also signed a memorandum of understanding to “work on necessary arrangements for the fabrication in Iran of the nuclear fuel or its elements to be used in Russian design Units.”

At the same time a contract for construction of the first two reactors as Bushehr phase II was signed by NIAEP-ASE and the Nuclear Power Production and Development Company of Iran. Two desalination plants are to be part of the project.

In May 2007 the AEOI said it was planning to build an indigenous 360 MWe light water reactor at Darkhowin/Darkhovain on the Karun River in Khuzestan province in the west, close to Iraq at the head of the Gulf. Two Framatome 950 MWe plants were about to be built here in 1970s, and two 300 MWe Chinese plants were planned in the 1990s. The head of NPPD denied that these new ones would use Chinese technology and in October 2008 announced that their design would begin shortly and be completed in six years. In 2011 AEOI said that it planned a 360 MWe plant there, and that its design was well underway, and in May 2012 AEOI said the design of the light water reactor was finished. A further announcement in February 2013 confirmed planning intention for a 360 MWe plant. In May 2013 a senior government official said that Iranian experts were designing a 300 MWe light water reactor for Darkhowin, under IAEA supervision. In May 2014 AEOI said it had made progress on the project. The IAEA has requested, but to early 2013 at least, apparently not been given, design information on this proposed plant.

Increasingly, part of the rationale for sites on the Gulf is desalination (for ‘sweet water’), giving them priority in planning.

A February 2013 announcement also said that 16 sites had been selected for new nuclear plants to be built over the next 15 years. In December 2013 AEOI said that a majority of Iran’s new nuclear facilities will be on its southern coast on the Persian Gulf and northern coast on the Caspian Sea, while another plant would be in central Iran. It was in talks with Rosatom regarding 4000 MWe of new plant, mainly at Bushehr or in Bushehr province.

Nuclear power reactors planned and proposed 

  type MWe gross construction start commercial operation planned close
Bushehr 2 VVER-1000/392? 1000 March 2015    
Bushehr 3  VVER-1000/V392? 1000 2016?    
planned: 2   2000      
Darkhowin LWR 360      
Bushehr 4 VVER ?      
Bushehr 5  VVER ?      
other 1-4  VVER        
Proposed: 7          

Iran is tectonically active, and nuclear power plants there need to be designed and built accordingly with high seismic criteria. In April 2013, following a magnitude 6.3 earthquake near Bushehr, the Gulf Cooperation Council met and expressed concern about possible radiation releases from the Bushehr nuclear plant. The six GCC Arab states had previously urged Tehran to ensure its facility complies with international safety standards and to join the IAEA Convention on Nuclear Safety.

Uranium enrichment

Iran has a major project developing uranium enrichment capability. This program is heavily censured by the UN, since no commercial purpose is evident.

The antecedents of this go back to 1974, when Iran loaned $1.18 billion to the French Atomic Energy Commission to build the multinational Eurodif enrichment plant at Tricastin, and it secured a 10% equity in the enterprise, entitling it to 10% of output. The loan was repaid with interest in 1991 but the plant has never delivered any enriched uranium to Iran since the new government in 1979 cancelled its agreements with Eurodif and ceased payments to it. But in 1991 Iran revived its nuclear power ambitions and demanded delivery of its share of uranium under original contract, but this was refused by France due to political sanctions then being in force. Iran views this refusal as proof of the unreliability of outside nuclear supplies and cites the Eurodif experience as the basis for achieving energy independence by developing all of the elements of the nuclear fuel cycle itself. The AEOI still holds the 10% share in Eurodif. Its 10.8 million SWU plant operated by Areva started production in 1979 and closed in mid 2012.

In about 2000 Iran started building at Natanz, 80 km southeast of Qom, a sophisticated enrichment plant, which it declared to IAEA only after it was identified in 2002 by a dissident group. This is known as the Pilot Fuel Enrichment Plant (PFEP), and is above ground, but also at Natanz a large underground Fuel Enrichment Plant (FEP) is being developed. Operations at the PFEP, FEP and the uranium conversion plant (UCF) are under international safeguards, though monitoring is constrained. To May 2010, environmental samples confirmed that both enrichment plants were operating as declared, FEP producing less than 5.0% enrichment. However, in February 2010 about 1950 kg of low-enriched uranium from FEP was taken to PFEP.

Natanz PFEP

At PFEP, two cascades have been designated for production of LEU enriched up to 20% U-235, ostensibly for the Teheran Research Reactor (TRR), and the balance of the plant is designated for R&D.

One cascade enriches from 3.5% LEU to almost 20%, while the second one takes the tails from the first one and produces about 10% LEU with tails of less than 1% uranium-235. The enriched stream is fed into the first cascade. In total, some 1177 kg of the 3.5% LEU from FEP has been fed into these, and 150kg of 19.75% enriched uranium has been produced from the start of operations to February 2013.

The IAEA earlier responded that the PFEP operations now " required a full revision of the previous safeguards approach". This was agreed in May 2010, including enhanced surveillance and checks. On 23 June 2011 the head of AEOI said: "We have the ability to produce 5 kg (of 20% enriched uranium) each month, but we do not rush." He had earlier said that the TRR required 1.5 kg of fuel per month. In August 2011 he confirmed that Iran had more 20% LEU than it needed for the Tehran research reactor, and that “security measures required that the sensitive part of the facilities would be transferred to underground buildings” – evidently Fordow. The IAEA reported then that monthly production rates of 20 percent LEU had increased significantly, implying better performance of the two IR-1 cascades. The near 20% UF6 is being converted to oxide form at the Fuel Plate Fabrication Plant at Esfahan. By August 2013 some 185 kg UF6 had produced U3O8 containing 87 kgU, the balance remaining in process.

In total, Iran has fed 1541 kg of 3.5% LEU to produce 189 kg of 19.75% uranium at PFEP since the beginning of operations in February 2010.

International concern regarding the surge of activity in enrichment to about 20% U-235 is based on the fact that in terms of SWU (energy) input this is about 90% of the way to weapons-grade material, and thus would require only a small and possibly clandestine plant to bridge the gap.

The PFEP at Natanz started operating in 2003, and by 2006 a 164-centrifuge IR-1 cascade had produced 3.6% enriched material. Two other cascades were being installed, IR-2 and IR-3, and a 10-machine IR-4 cascade followed by mid-2009. To mid-August 2009, about 140 kg of uranium hexafluoride (UF6) had been fed into various cascades of four types, producing uranium enriched to less than 5%. The IR-1 machine is the local version of Pakistan's P1 centrifuge design, and Iran is undertaking R&D on a variant of the more advanced P2 design. A few of these new design centrifuges designated IR-2, IR-4, IR-5 and IR-6 are installed, but output is intermittent. In November 2013 there were 164 IR-2m centrifuges installed and with 178 IR-4, ine IR-5, 13 IR-6 and one IR-6s centrifuges at PFEP. The IR-2m is reported to be at least three times as efficient s the IR-1.

Natanz FEP 

At the main underground FEP at Natanz, production hall A is being set up with eight units (A24-A28 initially, A21-A23 later), each of 18 cascades with 164 IR-1 centrifuges – total 2952 each unit. In August 2010 the IAEA reported that over 30.7 tonnes of UF6 had been fed into FEP, and 2803 kg of low-enriched uranium hexafluoride (3.5% U-235) had been produced. The target capacity is said to be 54,000 centrifuges. In February 2013 there were 12,699 centrifuges in 74 cascades plus three partially installed, and 53 cascades were operating (8992 centrifuges). By November 2013 the total installed was over 15,420 IR-1 centrifuges. A total of 8271 kg of low-enriched UF6 (3.5% U-235) had been produced at FEP, from over 82 tonnes of UF6 feed, and the rate was steady at 236 kg/month. Capacity in November 2013 was about 6735 SWU/yr. About 1557 kg of the output had been used to make the 19.75 % enriched UF6.

In January 2013 Iran informed the IAEA that it proposed to install IR-2m centrifuges at Natanz and over 1000 had been installed by August. There was preparatory work on the remaining 12 cascades of IR-2 machines. By November 2013 none of these were operating.

Fordow FFEP 

In September 2009, after the fact was exposed internationally, Iran told the IAEA that it was building another enrichment plant at Fordow, about 20 km north of Qom, in an underground tunnel complex on a military base. This Fordow FFEP is designed to have 8 cascades each of 174 IR-1 machines in each of two halls. Evidently construction began in 2006, and in November 2012 it had four IR-1 cascades (two sets tandem) operating, each 174 machines (so 696 centrifuges), producing 19.75% enriched uranium at a rate of 10.6 kg/month. Four further cascades have been installed and ready, and a further eight cascades with equipment in place but not installed. 

Lashkar Ab’ad laser laboratories

This was the site of experiments on undeclared laser enrichment about 2003, and the facility has expanded greatly in recent years. It is not clear what activities are being pursued there, as IAEA has been denied information and access. However, there are some indications that work on laser enrichment may continue. In 2010 there was a high-profile announcement that the country has laser enrichment capability.

Enrichment progress and plans

Over 2009-10 the Iranian centrifuge program was set back by the Stuxnet computer virus which affected Iranian companies involved with the control systems for the IR-1 centrifuges. In late 2009 to early 2010 about 1000 centrifuges at FEP were decommissioned. This appears to have been due to Stuxnet affecting frequency converters and causing the motors to over-speed, destroying the units. The normal failure rate of the IR-1 centrifuges is reported as about 10% per year. 

The underground Fordow enrichment plant (FFEP) is evidently playing a larger role in producing 19.75% enriched uranium, using the well-proved IR-1 centrifuges. This positions Iran to stockpile a large amount of 19.75% LEU in a facility better protected against military strikes. 

With about 9000 centrifuges operating through 2013 and to May 2014, most at 0.71 SWU/yr each (though Fordow 0.87), the total is about 6500 SWU/yr capacity at Natanz in May 2014, according to ISIS, and another 600 SWU/yr at Fordow with its 700 operating centrifuges. Across its three facilities, 18,458 IR-1 centrifuges and 1008 IR-2m centrifuges were installed at May 2104.

To November 2014 Iran had produced a total of 13,397 kg of LEU hexafluoride enriched up to 5%, of which 8390 kg remained in that form, the rest having been further processed. The rate was earlier about 233 kg/month. About 3437 kg of this LEU have been used to make 448 kg of 19.75 % LEU hexafluoride at PFEP and FFEP, and to January 2014 this had been ongoing at about 15 kg/month. This far exceeds Iran’s needs for the Tehran research reactor, and to August 2014 about 15% of this had been made into fuel assemblies for that reactor while the rest was converted to oxide. (About 260 kg of that material could be turned into 56 kg of weapons-grade uranium with input of only 1800 SWU, and the rate of production could readily be increased using installed capacity.)

Uranium Resources and Mining

In the early 1980s Iran purchased 450 tonnes of uranium (531 t U3O8) from South Africa. Some 366 t of this was subsequently converted to UF6 at Esfahan. This is the main, and practically the only, material being used in Iran's enrichment plants.

Iran has very small reported uranium resources, all in a high cost category, about one-third as reasonably assured and two-thirds as inferred resources. It is reported to have significant levels of molybdenum and other impurities which create difficulties in enrichment. AEOI is responsible for uranium exploration, mining and treatment. Most exploration is in central Iran.

The only mining and milling so far is at Gachin/Gchine, near the port of Bandar Abbas on the Persian Gulf, in Hormozgan province. The ore is in surficial salt plugs at 0.20 %U grade, accessed by open pit. The Bandar Abbas Uranium Production Plant (BUPP) began production from Gachin ore in 2006, and operations continue, to produce about 12 tU/yr with acid leaching. This is delivered to the conversion plant at Isfahan.

An underground mine has been developed at Saghand in the central desert region of Yazd province, and AEOI announced commencement of production there in April 2013. Resources of 900 tU at 0.055% U are quoted. The associated Ardakan mill about 75 km west of Saghand is expected to produce 58 tU/yr from the higher-grade ore (av 0.05%) with acid leaching, while lower grade material (0.01 to 0.03%) will be heap leached at site.

In February 2013 AEOI announced that uranium resources had increased to 4000 tU from 1527 tonnes. No details were given.

Other parts of fuel cycle

A uranium conversion plant (UCF) at the Isfahan Nuclear Technology Centre has 200 t/yr capacity and started up in 2004. It is under IAEA safeguards and the IAEA reported that to November 2014 it had produced 550 tonnes of natural UF6, of which 163 tonnes had been moved to Natanz FEP.

Enrichment activities at Natanz and Fordow are covered above.

A fuel fabrication plant is being built next to the UCF. 

Iran continues producing fuel for the Tehran Research Reactor (TRR), and one quarter of the 185 kg of near 20 percent LEU hexafluoride (125 kgU) sent for conversion to oxide has been made into 21 TRR fuel assemblies.

Research & Development

The Teheran Nuclear Research Centre was established in 1967 by the AEOI. It has a US-supplied 5 MW pool-type research reactor which has operated since about 1967. The IAEA monitors the Teheran Research Reactor (TRR) and also a Molybdenum, Iodine and Xenon Radioisotope production facility (MIX). Since being converted from 93% HEU about 1988 by Argentinian specialists, the TRR runs on 19.75% enriched uranium, and 116 kg of this was supplied from Argentina about 1993 – enough for 10-20 years depending on how the reactor is operated. This had nearly run out in 2009. It was earlier said that the presence of molybdenum in Iranian UF6 means that domestic supplies may be unsuitable at this level of enrichment, but this is unconfirmed.

In 2009 it seemed likely that Russia might provide some further uranium for TRR fuel blended down from 36% enriched material and fabricated in France, in exchange for an equivalent amount of Iran's (< 5%) enriched uranium from Natanz. This was rejected by Iran, which then tabled a revised version. At issue was the amount of Iran's uranium stockpile to be handed over at one time, and where this would occur. The international negotiators wanted to do this exchange in one large shipment, while Iran preferred several smaller swaps which maintained more of its overall holding for a longer period. In February 2010 the government ordered the AEOI to commence enriching Iranian uranium to 19.75%. It is not clear whether the Isfahan fuel fabrication plant can make fuel elements for TRR.

In May 2010, a deal with Brazil and Turkey was announced and submitted to the IAEA whereby Iran would ship 1200 kg of 3.5% enriched uranium to Turkey, and then receive 120 kg of 19.75% enriched uranium fuel elements for the TRR in return from the so-called Vienna Group, comprising the IAEA, USA, Russia and France. This apparently did not proceed.

The Nuclear Technology Center of Isfahan operates four small nuclear research reactors, all supplied by China. The Center is run by the AEOI. In April 2013 the AEOI announced plans for a new research reactor at Bonab, and in June the location was reported as Zarghan, in East Azerbaijan province, respectively south and north of Tabriz.

A plant for making research reactor fuel plates for TRR was expected to be commissioned about the end of 2011, and in August 2012 the IAEA said that ‘a small amount’ of the 19.75% enriched uranium had been used thus.

In June 2010 the AEOI announced that it planned to build four new research reactors for production of medical isotopes, including a 20 MW one to replace TRR when its operational life finishes in 15 years. This plan would justify production of more 20%-enriched uranium at Natanz, which gives rise to international concern. In May 2014 the AEOI announced plans for a 10 MW light water research reactor at Shiraz to produce medical and industrial radioisotopes.

Arak IR-40 heavy water reactor 

Iran is also building a 40 MW heavy water-moderated reactor at Arak fuelled by natural uranium. It is declared as being to replace the old Teheran reactor for production of radioisotopes. 

The IR-40 design is very similar to those used by India and Israel to make plutonium for nuclear weapons, and was apparently designed by Russia's NIKIET. Construction is under way and the incomplete plant was "inaugurated" in August 2006. In August 2009 it was about 63% complete, with the reactor vessel due to be installed in 2011. In July 2011 AEOI reported it as 75% complete. Iran has said that it will be under IAEA safeguards, and has been subject to IAEA inspection during construction. However, from 2006 Iran has declined to provide IAEA with detailed design information on the IR-40 reactor to allay concerns regarding its precise purpose.  An IAEA design verification visit in February 2013 noted that cooling and moderator plumbing was almost complete, though in November critical components were not yet installed. It was expected to start up in 2014, with a delay due to slow progress with fuel fabrication. However, in October 2014 it was still incomplete. In April 2014 AEOI announced that an oxygen-18 production unit for PET had started operation at Arak.

The UN Security Council has demanded that construction of IR-40 cease due to its plutonium production potential. In February 2014 the AEOI said that the reactor was not primarily for plutonium production, that its 9 kg/yr of Pu would not be weapons grade, and anyway AEOI might redesign it to meet western concerns. Also it said that Iran has no reprocessing capacity. US sources have suggested changing the fuel and lowering the power to reduce plutonium production to about 1 kg per year while still enabling its purported use for making radioisotopes.

A heavy water production plant is operating at Arak, but the IAEA was denied access to it from 2011 to November 2013. It began construction in 2001. It can produce 16 tonnes of reactor-grade heavy water per year.

A fuel manufacturing plant has been constructed at Isfahan to serve the IR-40 reactor and possibly Bushehr and TRR. In May 2009 the IAEA noted that fuel rods were being produced and that an initial fuel assembly for IR-40 had been produced from these. In 2012 production of natural uranium oxide fuel pellets continued. In November 2012 the IAEA noted that a prototype IR-40 natural uranium fuel assembly was to be irradiation tested at TRR. In November 2013 the IAEA said that ten IR-40 fuel assemblies had been made, out of 150 needed for a full core. Fuel production stopped in 2014 under the terms of the Joint Plan of Action (see below).

Organisation, regulation & safety

The Atomic Energy Organization of Iran (AEOI) has been the lead authority since 1974. It is responsible for the establishment of regulations for nuclear and radiation safety (under a 1989 act), licensing facilities, and supervising.

The Nuclear Power Production & Development Company of Iran (NPPD), established in 2004, is responsible for Bushehr.

The Iran Nuclear Regulatory Authority (INRA) is responsible for regulation and safety, as well as monitoring, legal compliance and radioactive waste management. It is under the AEOI and maintains a close relationship with its Russian counterpart, Rostechnadzor.

The Nuclear Science & Technology Research Institute (NSTRI) was established in 2002 to take over AEOI’s research role.


Iran joined the Nuclear Non-Proliferation Treaty (NPT) in 1970 and concluded its safeguards agreement with the IAEA in 1974. It has signed the Additional Protocol to this safeguards agreement but has not ratified it.

All Iran's facilities, except the Kalaye plant and the Arak heavy water plant, were under IAEA safeguards as of mid 2003. Details are in the Director-General's reports to the IAEA Board on IAEA website.

Iran originally attracted world attention in 2002 when some previously undeclared nuclear facilities became the subject of IAEA inquiry. On investigation, the IAEA found inconsistencies in Iran's declarations to the Agency and raised questions as to whether Iran was in violation of its safeguards agreement, as a signatory of the NPT.

An IAEA report in November 2003 showed that Iran had, in a series of contraventions of its safeguards agreement over 22 years, systematically concealed its development of key techniques which are capable of use for nuclear weapons. In particular, that uranium enrichment and plutonium separation from used fuel were carried out on a laboratory scale. Iran admitted to the activities but said they were trivial.

In August 2005 the IAEA Board called upon Iran to suspend work associated with uranium enrichment. In March 2006 the IAEA referred the issue to the UN Security Council, which in 2006 required that “Iran shall without further delay suspend . . . all enrichment-related and reprocessing activities.” However Iran has not backed off from its activities in developing uranium enrichment.

On 24 March 2007 the UN Security Council unanimously adopted a resolution imposing further sanctions on Iran and reaffirming that Iran must take the steps required by the IAEA Board, notably to suspend its uranium enrichment activities. The IAEA reported in May 2007 that Iran had ceased providing information required under the Additional Protocol.

The IAEA stated clearly in November 2007 and since that unless the Additional Protocol was ratified and in place it is not possible for the Agency to establish that undeclared nuclear materials and activities are absent. Its "knowledge about Iran's current nuclear program is diminishing." Meanwhile enrichment continues, the existence of the underground and undeclared Qom plant has come to light, and hence a third UN Security Council resolution appeared likely.

The Iran situation has revived wider concerns about which countries should develop facilities with high proliferation significance – such as enrichment and reprocessing, even under safeguards if there is no evident economic rationale. At some point in the future, such a country could give three months notice of withdrawal from the NPT and reconfigure its facilities for weapons production. The USA asserts that Iran has been in fact developing just such a breakout capability. 

This contention was supported in February 2010 when the government ordered the AEOI to commence enriching Iranian uranium to 19.75% for the Teheran Research Reactor (TRR), thereby significantly closing the gap between its normal low-enriched material and weapons-grade uranium. The 1950 kg of low-enriched uranium (< 5%) moved to PFEP would be enough for vastly more 19.75% enriched uranium than the TRR could conceivably use. In August 2011 the AEOI confirmed that Iran had more 20% LEU than it needed for the Tehran research reactor, and that “security measures required that the sensitive part of the facilities would be transferred to underground buildings” – evidently Fordow.

Since early 2012 Iran has continued to deny the IAEA’s requests for access to the alleged high explosive testing site related to nuclear weaponization experiments at Parchin. The extensive activities, including asphalting much of it, that Iran has undertaken there have seriously undermined the Agency’s ability to conduct effective verification. This is looming as a factor to block implementation of the 2013 Geneva agreement.

Iran has agreed with the IAEA on safeguard measures for the IR-40 heavy water reactor at Arak and has pledged to finalise these by August 2014.

On 11 November 2013 a new Joint Statement on a Framework for Cooperation was signed with the IAEA whereby “Iran and the IAEA will cooperate further with respect to verification activities to be undertaken by the IAEA to resolve all present and past issues.” It addresses several of IAEA’s secondary concerns other than the main centrifuge enrichment program and the heavy water reactor, but set a three-month target for six measures. The agreement is essentially a test of possible enhanced cooperation on the main issues and to set up a negotiating process. This initiative was in parallel with the P5+1 negotiations. In September 2014 the IAEA reported that Iran was not meeting its obligations under the Framework.

November 2013 Geneva Agreement

An agreement to curb Iran’s evident progress towards nuclear weapons capability was struck on 24 November 2013 between Iran and the foreign ministers of China, France, Germany, Russia, UK, and USA (P5+1 - the five permanent members of the UN Security Council plus Germany) and a senior EU representative. It links closely to the IAEA Joint Statement on a Framework for Cooperation signed two weeks earlier.

The initial steps of the Joint Plan of Action cover a term of six months, renewable by mutual consent. For that period, Iran undertook not to enrich uranium to over 5% U-235, nor to make "any further advances" of activities at its Natanz and Fordow enrichment plants or the Arak heavy water reactor. It would not install any further centrifuges beyond the 18,500 then, nor operate the 1000 or so advanced centrifuges among these. It also undertook to dilute half of its "working stock" of 20%-enriched uranium to no more than 5%, with the remainder retained as oxide for fabrication of fuel for the Tehran Research Reactor (TRR). Enhanced monitoring activities would include wider access for IAEA inspectors and provision of information to the IAEA. In return, the countries underook to lift various US and EU sanctions on sectors including petrochemical exports, gold and precious metals and promised that no new nuclear-related sanctions would be imposed by either the UN Security Council or the EU over the six-month period covered by the first step, which commenced on 20 January 2014.

The Geneva interim plan aims to resolve two key issues before a comprehensive deal can be finalized. First, all IAEA concerns about Iran’s past, and possibly ongoing, work on nuclear weapons and other alleged military nuclear activities must be satisfied – Iran had stalled on this for years, notably in blocking IAEA access to the Parchin site. Secondly, Iran needs to address satisfactorily all provisions of UN Security Council resolutions, if not by suspending its centrifuge program as earlier demanded, then taking enough tangible steps to alleviate international concerns about this aspect of its nuclear program and the Arak heavy water reactor.

According to the action plan, the parties aim to conclude negotiating and begin implementing a long-term "comprehensive solution" within a year of the adoption of the Geneva agreement. The comprehensive solution would involve a mutually defined enrichment program with "practical limits and transparency measures" to ensure that Iran's nuclear program remains peaceful. "Iran reaffirms that under no circumstances will Iran ever seek or develop any nuclear weapons," the action plan states. The ultimate objective is the lifting of all nuclear-related sanctions against Iran, and the country's nuclear program being treated in the same way as that in any other non-nuclear weapon state that is party to the nuclear non-proliferation treaty (NPT).

The IAEA report on 20 March 2014 said that Iran had not enriched any uranium above 5% at any declared facility and was beginning to downblend or convert its stockpile of this 20% material (75 kg UF6 downblended so far at PFEP, 32 kg UF6 converted to oxide at Fuel Plate FP), it had not installed any further centrifuges at Natanz FEP or Fordow, it had not progressed work on fuel for the IR-40 reactor, it had provided access to the uranium mine and mill at Gchine, and it continued R&D at Natanz PFEP including work on the new IR-8 centrifuge. The plant to convert low-enriched UF6 to UO2 was not yet operational.

The IAEA report on 23 May 2014 said that Iran had not enriched any uranium above 5% at any declared facility, had downblended 100 kg of near 20% enriched UF6 and converted the rest to oxide (essentially leaving none as UF6, but with now about 230 kg as oxide), it had not installed any further centrifuges at Natanz FEP or Fordow, it had not progressed work on the Arak IR-40 reactor or made fuel for it, it had provided access to the Arak heavy water plant, and it continued R&D at Natanz PFEP. The 20 July 2014 IAEA report confirmed these data for the near 20% enriched material, and that 1505 kg of ca. 5% enriched UF6 had been converted to UO2.

See also Nuclear Proliferation Case Studies paper.

Main References

OECD NEA & IAEA, 2006, Uranium 2005: Resources, Production and Demand
IAEA website, particularly Iran section
Institute for Science & International Security, 2009, Nuclear Iran: not inevitable; Jan 2009.
Institute for Science & International Security, 2010, IAEA Iran Report, 18 Feb 2010.
Institute for Science & International Security, 2010, Did Stuxnet Take Out 1,000 Centrifuges at the Natanz Enrichment Plant? Preliminary Assessment, 22 Dec 2010.
Institute for Science & International Security, 2011, Stuxnet Malware & Natanz, 16 Feb 2011.
Institute for Science & International Security, 25/11/2013, The Rocky Path to a Long-Term Settlement with Iran, and 26/11/13 Iran’s Negotiating Track with the IAEA.
Institute for Science & International Security, 2014, IAEA Iran Report, 23 May 2014.
ISIS Nuclear Iran website – reports to 14/11/13
AEOI, late 2011, Nuclear Industry in Iran (booklet).
Khlopkov, Anton & Lutkova, Anna, August 2010, The Bushehr NPP: Why did it take so long? Centre for Energy & Security Studies, Moscow (
Rosatom-AEOI protocol 11/11/14 on building eight new reactors
Rosatom-AEOI MOU 11/11/14 on fuel fabrication in Iran.