PARIS — As it prepares for two sets of negotiations with outsiders on its disputed nuclear program, Iran said on Tuesday that it was converting some of its enriched uranium into reactor fuel, the state news agency IRNA reported, potentially limiting the expansion of stockpiles that the West fears could be used for weapons.

Iranian officials are to meet on Wednesday in Tehran with Herman Nackaerts, the deputy director of the International Atomic Energy Agency, the United Nations nuclear watchdog, who has been pressing for access to a restricted military area at Parchin, 20 miles south of Tehran. International inspectors suspect that the site may have been used for testing bomb triggers.

Later this month, Iranian negotiators are to meet in Kazakhstan with representatives of six powers — the United States, China, Russia, Britain, France and Germany — for a further round in a series of long-running and inconclusive talks about curbing Tehran’s uranium enrichment program.

Western countries suspect that the Iranian government is seeking to acquire the technology to make nuclear weapons despite its assertion that the program is for peaceful purposes like the creation of reactor fuel for civilian use.