Iran announced some nuclear " achievements” on Wednesday in defiance to the western sanction threats.In a ceremony held in Tehran, Iranian President Mahmoud Ahmadinejad unveiled nuclear fuel rods, new generation of centrifuges and a number of radioactive medicines.In the ceremony, Ahmadinejad, symbolically, fed a home-made fuel rod made out of 20-percent enriched uranium into the core of Tehran Research Reactor.State TV broadcast live a ceremony in which Ahmadinejad was briefed about the process of production and performance and then he fed a rod into the core of Tehran Research Reactor.Simultaneously, the TV showed other "achievements” in Iran’s nuclear technology, including the radioactive medicines for the treatment of cancer.Ahmadinejad also unveiled a new generation of centrifuges for uranium enrichment.In a live broadcast footage by the state TV, a model of the forth generation of domestically-made centrifuges was presented.At the same time, a live video from Iran’s central Natanz enrichment site displayed a chain of new generation of centrifuges.