The report by IRNA quoted Ali Akbar Salehi, the head of Iran's nuclear agency, saying that the plant will convert uranium hexafluoride, which can be used to make nuclear weapons and fuel. It will become uranium dioxide, which can only be used in nuclear reactors, he said.
"The process has begun and we have implemented our commitment," Salehi was quoted as saying.
In November, Iran accepted to cap its uranium enrichment in return for the easing of some sanctions by the West. Iran and world powers now are negotiating terms of a final deal, which faces a November deadline.
The West fears Iran's nuclear program could allow it to build atomic weapons. Iran says its program is for peaceful purposes, like power generation and medical research.
