IR-40

IR-40 (officially the Khondab Heavy Water Research Reactor), part of the Arak Nuclear Complex, is an Iranian 40 megawatt (thermal) heavy water reactor near Arak, adjacent to the 1990s era Arak Heavy Water Production Plant. Civil works for the project began in October 2004. It was initially planned that the reactor would begin nuclear operations in 2014. The reactor was hit by an Israeli airstrike during the Iran–Israel war in June 2025 after Israel told residents of the surrounding areas to evacuate for their safety.