Vienna (AFP) - The UN's nuclear watchdog said Monday that Iran's stock of heavy water for reactors has surpassed the limit set under its agreement with world powers. The International Atomic Energy Agency said in a statement that Iran's heavy water production plant was in operation and that its stock of heavy water reserves was 131.5 tonnes, above the 130-tonne limit. In Vienna, an IAEA spokesperson said: "On 17 November, the Agency verified that the Heavy Water Production Plant (HWPP) was in operation and that Iran’s stock of heavy water was 131.5 metric tonnes." Heavy water is not itself radioactive...