Iran and China signed a contract for the redesign of the Arak heavy water reactor. Under the terms of the Joint Comprehensive Plan of Action (JCPOA), Iran is required to redesign and rebuild the reactor to run on uranium fuel enriched up to 3.67%. According to the head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi, Iran  is responsible for the new reactor design and related equipment, with China and the United States responsible for evaluating and certifying the design.