The Tehran Research Reactor (TRR) is a 5 megawatt-thermal (MWth) pool-type light water research reactor. The United States supplied the TRR to Iran in 1967 and weapon-grade uranium fuel for the reactor.The International Atomic Energy Agency (IAEA) inspects this reactor.ithout notifying the IAEA Iran irradiated uranium oxide (UO2) targets in the TRR and separated plutonium in glove boxes at Tehran Nuclear Research Center (TNRC) laboratories. Iran also admitted to producing small amounts of polonium-210 in the TRR in the early 1990s through the irradiation of bismuth targets.