Iran has breached another limit of its 2015 nuclear deal with major powers by accumulating slightly more than 130 tons of heavy water, a substance used in a type of reactor it is developing, the UN nuclear watchdog said in a report seen by Reuters on Monday.
Heavy water is not as sensitive as uranium, which Iran is enriching in a quantity and to a level of purity beyond limits in the deal. However, the 2015 deal says Iran should not have more heavy water than it needs, specifying this is estimated to be 130 metric tons.
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