JERUSALEM / TEHRAN — March 27, 2026 : The Israel Defense Forces (IDF) confirmed on Friday that the Israeli Air Force carried out a new round of targeted airstrikes against key components of Iran’s nuclear infrastructure, including the Khondab Heavy Water Research Reactor (IR-40) at the Arak Nuclear Complex and the Ardakan Yellowcake Production Plant in Yazd province.
The IDF described the Khondab reactor as critical infrastructure associated with plutonium production for nuclear weapons and said the strike was intended to prevent the restoration of capabilities at the site following earlier damage.
Strike on Arak Reactor and Operational Context
According to Israeli military officials, the operation targeted the Khondab Heavy Water Research Reactor located within the Arak Nuclear Complex, approximately 250 kilometers southwest of Tehran. The facility, originally designed as a 40-megawatt thermal (MWt) heavy water-moderated reactor using natural uranium fuel, has long been a focal point in assessments of Iran’s potential plutonium production pathway.
The IDF stated that the decision to conduct a second strike on the facility followed intelligence indicating that Iran had resumed efforts to rebuild and restore operational capability at the site.
“Repeated reconstruction attempts by the Iranian regime at the site were identified. Therefore, the IDF has struck the facility once again,” the military said in an official statement.
This marks the second Israeli strike on the Arak facility, following an earlier operation in June 2025 during the Twelve-Day War (Operation Rising Lion). That earlier strike targeted the reactor’s core seal and containment structure, components assessed to be linked to plutonium production. At the time, the reactor was not operational and contained no nuclear material.
Evacuation Measures and Civilian Risk Mitigation
Prior to the strikes, the Israeli military issued evacuation warnings in Farsi via social media platforms. Residents in northwestern areas of Arak city and the nearby Khairabad Industrial Area were instructed to leave the vicinity to reduce the risk of civilian casualties.
No casualties have been reported by Israeli officials in connection with the latest strikes.
Additional Target: Ardakan Yellowcake Production Plant
In the same operational wave, Israeli forces also struck the Ardakan Yellowcake Production Plant in Yazd province. The facility is responsible for converting raw mined uranium ore into yellowcake, a concentrated uranium compound used in the early stages of the nuclear fuel cycle prior to enrichment.
Israeli officials identified the plant as part of the broader nuclear supply chain, linking upstream uranium processing with downstream enrichment and potential weapons-related activities.
Iranian Confirmation and Official Response
Iranian state media, including the IRNA news agency, confirmed that both the Shahid Khondab Heavy Water Complex and the Ardakan facility were hit. Officials from the Atomic Energy Organization of Iran (AEOI) and provincial authorities reported that the Arak strikes occurred in two distinct phases.
Iranian authorities stated that there were no casualties resulting from the attacks. The AEOI also confirmed that the Khondab reactor was inactive at the time of the strike, and as a result, there was no release of radioactive material or risk of contamination to surrounding areas.
Technical Significance of the Arak Reactor
The Khondab Heavy Water Research Reactor is central to concerns regarding plutonium production due to its design. Heavy water reactors use deuterium oxide as a neutron moderator and can produce plutonium as a byproduct during normal operation.
Under its original configuration, the IR-40 reactor was assessed to be capable of producing approximately 8 to 12 kilograms of plutonium annually in its spent fuel. Analysis indicated that around 8 to 10 kilograms of weapons-grade plutonium-239 could potentially be extracted each year, sufficient for one to two nuclear weapons if reprocessed.
This plutonium pathway provides an alternative route to nuclear weapons development that does not rely on uranium enrichment, making it a distinct proliferation concern.
JCPOA Commitments and Reactor Redesign
Under the 2015 Joint Comprehensive Plan of Action (JCPOA), Iran agreed to redesign the Arak reactor to significantly reduce its plutonium output. The original reactor core, or calandria, was to be removed and filled with concrete to render it unusable, and all spent fuel was to be exported from the country.
Following these commitments, the facility was renamed the Khondab Heavy Water Research Reactor, and construction under the original design was halted. The redesigned reactor was intended for peaceful purposes, including research and medical isotope production, with commissioning projected for 2023–2024 under a lower-power configuration.
The Arak complex also includes a heavy water production plant with an estimated capacity of up to 16 metric tons annually, supporting reactor operations.
Israel has maintained that Iran retained the underlying infrastructure necessary to revert to weapons-grade plutonium production, alleging incomplete compliance with JCPOA provisions.
Strategic Assessment and Ongoing Monitoring
Israeli defense officials have stated that the Arak reactor represents a key element of Iran’s nuclear program, both from a technical and economic perspective. The IDF described the facility as a significant financial asset for the Atomic Energy Organization of Iran (AEOI), reportedly generating tens of millions of dollars annually.
The repeated strikes are aligned with Israel’s broader objective of disrupting both plutonium-based and uranium-based pathways to nuclear weapons development.
The Arak Nuclear Complex remains subject to monitoring by the International Atomic Energy Agency (IAEA), where access is maintained under existing safeguard arrangements. Iran continues to assert that its nuclear activities at the site are intended for civilian and peaceful applications.
No further details have been released regarding the extent of damage from the latest strikes or the timeline for any potential reconstruction efforts at the affected facilities.
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