The implementation of a nuclear agreement between Iran and six world powers is expected to begin in late December or early January, Tehran’s envoy to the UN atomic watchdog said Friday.

The implementation of a nuclear agreement between Iran and six world powers is expected to begin in late December or early January, Tehran's envoy to the UN atomic watchdog said Friday.

"We expect that either at the end of December or the beginning of January we should start implementing the measures agreed by both sides," Reza Najafi, envoy to the International Atomic Energy Agency, told reporters.

The breakthrough accord struck last weekend between Iran and the United States, China, Russia, Britain, France and Germany -- the P5+1 -- foresees Iran rolling back some of its nuclear program temporarily in exchange for sanctions relief.

"We have had preliminary discussions with the agency with regard to the nuclear-related measures ... to be verified by the agency," Najafi said Friday.
"We are going to continue those discussions."

This will mean an increased workload for the IAEA and its Japanese chief Yukiya Amano, who said Thursday that "some time" -- and more money -- would be needed to work out how to verify the deal.

"This requires a significant amount of money and manpower.... The IAEA's budget is very, very tight. I don't think we can cover everything from our own budget," Amano told reporters.