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| Arak reactor | |
|---|---|
| Name | Arak Heavy Water Reactor |
| Country | Iran |
| Location | Arak, Markazi Province |
| Status | Modified / partially dismantled (as of 2021) |
| Operator | Atomic Energy Organization of Iran |
| Type | Heavy water reactor (HWR) / IR-40 design |
| Thermal power | 40 MWth (design) |
| Coolant | Light water (initial design used heavy water moderator with light water coolant) |
| Moderator | Heavy water (D2O) |
| Fuel | Natural uranium (original design) / low-enriched uranium (post-modification) |
| Construction began | 2006 |
| Commissioning | Not fully commissioned for power/research operations |
Arak reactor is a heavy-water moderated research reactor facility near Arak, Iran, designed originally as the IR-40 heavy water reactor. Conceived in the early 2000s, the facility drew attention for its potential to produce weapons-grade plutonium and for its role in Iran’s nuclear program. The installation became a focal point of diplomatic negotiations involving the International Atomic Energy Agency, P5+1, and the Joint Comprehensive Plan of Action.
The project emerged amid expansion of Iran’s nuclear infrastructure, linked to sites such as Bushehr Nuclear Power Plant, Natanz uranium enrichment facility, and the Fordow Fuel Enrichment Plant. Designed as a 40-megawatt-thermal heavy-water research reactor, it was intended to support activities at institutions like the Atomic Energy Organization of Iran and Tehran University's nuclear research groups. International scrutiny intensified because heavy-water reactors are associated with plutonium production, raising concerns by the International Atomic Energy Agency and governments including the United States, United Kingdom, France, Germany, and Israel.
The IR-40 design featured a heavy water moderator and light water coolant, similar in concept to heavy-water reactors at facilities like Canada's NRU reactor and the Khushab Nuclear Complex in Pakistan. Specifications included a 40 MW thermal power rating, use of natural uranium metal or oxide fuel, and on-site spent fuel handling. The reactor's design allowed for on-power refueling cycles in some heavy-water reactor analogues, which led experts from International Atomic Energy Agency and national laboratories such as Los Alamos National Laboratory and Oak Ridge National Laboratory to assess plutonium production pathways. Cooling systems, containment approaches, and fuel routing were debated in technical briefings involving institutions like ISIS (Institute for Science and International Security).
Construction began in the mid-2000s near Arak, Iran, involving Iranian contractors and oversight from the Atomic Energy Organization of Iran. Work progressed alongside other projects at sites like Isfahan Uranium Conversion Facility and prompted multiple IAEA inspections. During the 2010s, satellite imagery analysis by organizations such as Institute for Science and International Security and reporting by media outlets in The New York Times and The Guardian chronicled progress and pauses in construction. Operational commissioning for research or power generation was not achieved in a conventional sense before international negotiations altered the facility’s trajectory.
Originally planned fuel choices—natural uranium metal or oxide—would have tied the reactor to upstream facilities such as the Uranium conversion facility at Isfahan and downstream facilities for spent fuel handling. Plutonium separation potential raised concerns about reprocessing capabilities akin to facilities at La Hague or Sellafield in other contexts, prompting calls for safeguards including IAEA continuous monitoring and fuel-leasing or repatriation arrangements modeled on agreements with nations like Taiwan and South Korea. Waste management strategies discussed included on-site interim storage, dry cask options analogous to methods at Hanford Site and eventual conditioning for geological repositories similar to plans in Sweden and Finland.
Technical assessments referenced seismic risk in central Iran near Zagros Mountains and infrastructure resilience comparable to evaluations done for reactors in Japan and Italy. Safety analyses involved containment resilience, heavy-water system integrity, coolant-loss scenarios, and radiological consequence modeling informed by methodologies used by Nuclear Regulatory Commission and International Atomic Energy Agency safety standards. Environmental monitoring proposals paralleled programs at facilities like Chernobyl exclusion studies and routine surveillance practices from European Commission nuclear safety networks.
The reactor was central to disputes between Iran and countries including United States, United Kingdom, France, Germany, and Russia. Negotiations involving the P5+1 led to provisions in the Joint Comprehensive Plan of Action that required redesign, modification, or constraints on the reactor to reduce plutonium production. The IAEA played a mediating and verification role, with technical annexes and verification mechanisms reminiscent of arrangements under the Nuclear Non-Proliferation Treaty safeguards agreements and precedents set in negotiations with North Korea and the IAEA–Libya Declaration.
Following diplomatic agreements, modifications were implemented to alter the reactor’s core design, fuel type, and spent fuel handling to limit weapons-significant plutonium production, with verification by the International Atomic Energy Agency. Actions included partial dismantlement, redesign toward low-enriched uranium cores, and removal of heavy-water moderator components analogous to conversion steps discussed in international technical reviews. As of the early 2020s the site status reflected reduced proliferation risk and ongoing IAEA monitoring, while the facility remained a persistent topic in bilateral and multilateral discussions involving Iranian Supreme National Security Council, European Union External Action Service, and national capitals such as Washington, D.C. and London.
Category:Nuclear reactors in Iran