DUBAI, United Arab Emirates — Iran agreed Monday to offer more information and expanded access to U.N. nuclear inspectors – including more openings at a planned reactor and uranium site.

Under the plans, announced at a joint news conference, Iran would allow inspectors a first-time visit of its key Gachin uranium mine on the Persian Gulf coast and give broader access to the heavy water facility being built in the central city of Arak. Heavy water reactors use a different type of coolant to produce a greater amount of plutonium byproduct than conventional reactors. Inspectors from the U.N.’s International Atomic Energy Agency, or IAEA, have already visited the reactor site, but seek more extensive examinations.

The new accord also calls on Iran to provide more details on its nuclear program including proposed new reactor sites and all planned research reactors.