Arak was originally conceived in the 1990s following Iran’s decision to pursue a nuclear capability in response to the 1980-88 war with Iraq. Unable to procure a heavy water reactor from international sources, Tehran opted to develop its own. According to the Associated Press, heavy water reactors differ from light water reactors in that they use deuterium oxide (heavy water) as a neutron moderator, enabling the use of natural uranium and the production of plutonium as a byproduct.
Over the past week, Israel has acknowledged strikes on Natanz, Isfahan, Karaj, and Tehran, describing the campaign as a preemptive measure to degrade Iran’s nuclear capabilities and prevent any progress toward weaponisation.
Video footage released by the Israel Defense Forces shows precision-guided munitions hitting the reactor dome, followed by a plume of fire and debris. The footage, though brief, was consistent with Maxar’s satellite imagery showing the collapse of the reactor dome’s crown structure.
In a statement, Israeli officials said the attack was “intended to target the plutonium-producing component of the Khondab reactor in order to prevent its restoration and eventual use for military nuclear development.”
The International Atomic Energy Agency (IAEA), the UN’s nuclear watchdog, has confirmed that there was no radiological release from the Arak facility, noting that the reactor was not yet loaded with fuel and had never entered operational status. Nevertheless, the agency expressed “serious concern” over the precedent of military attacks on nuclear installations.
Arak’s Role In 2015 Nuclear Deal
The Arak reactor was a contentious point during the negotiations of the 2015 Joint Comprehensive Plan of Action (JCPOA), the nuclear deal between Iran and six world powers. As part of that agreement, Iran pledged to redesign the reactor to significantly reduce its plutonium output and render part of the core inoperable by pouring concrete into it.
Yet, following the US withdrawal from the agreement in 2018 under US President Donald Trump, progress on the redesign halted. In 2019, Ali Akbar Salehi, the head of Iran’s Atomic Energy Organisation at the time, revealed on Iranian state television that duplicate parts had been secretly procured to allow for the potential reassembly of the disabled components.
Inspectors from the IAEA have repeatedly said since then that due to limitations imposed by Iranian authorities, the agency lost “continuity of knowledge” regarding both the reactor’s configuration and heavy water stockpiles.