The International Atomic Energy Agency (IAEA) reported that Iran began producing uranium metal at a nuclear facility in Isfahan on February 6. Iran produced 3.6 grams of natural uranium metal in a "laboratory experiment," according to the IAEA. About half a kilogram of highly enriched uranium metal can be used in the core of a nuclear weapon. Earlier, Iran said it would make uranium metal to prepare fuel for a nuclear research reactor in Tehran. The 2015 nuclear accord prohibits Iran from producing uranium metal for 15 years.