PAEC continued its research on plutonium and built the 40–50 MW (megawatt, thermal) Khushab Reactor Complex at Joharabad. In April 1998, Pakistan announced that the nuclear reactor was operational. The Khushab reactor project was initiated in 1986 by Munir Khan, who informed the world that the reactor was totally indigenous, i.e. that it was designed and built by Pakistani scientists and engineers. Various Pakistani industries contributed in 82% of the reactor's construction. The Project-Director for this project was Sultan Bashiruddin Mahmood. According to public statements made by the US Government officials, this heavy-water reactor can produce up to 8 to 10 kg of plutonium per year with increase in the production by the development of newer facilities, sufficient for at least one nuclear weapon. The reactor could also produce tritium if it were loaded with lithium-6, although this is unnecessary for the purposes of nuclear weapons, because modern nuclear weapon designs use directly. According to J. Cirincione of Carnegie Endowment for International Peace, Khushab's Plutonium production capacity has allowed Pakistan to develop lighter nuclear warheads that would be easier to deliver to any place in the range of the ballistic missiles.