"Iran has conducted its enrichment activities in line with its long-term enrichment and R&D enrichment plan" agreed with world powers, according to the six-page confidential document, seen by several news agencies, including Iran's IRNA.
Iran agreed to limit its nuclear program's capabilities while the USA and five other world powers eased economic sanctions on the country.
Despite mounting pressure from the Trump administration, the International Atomic Energy Agency (IAEA) said Thursday that Iran was in compliance with a 2015 treaty it signed with the USA and five other leading world powers.
U.S. Ambassador to the United Nations Nikki Haley said on August 31 that Iran is showing its "true colors" by renewing ties with the Palestinian militant group Hamas and providing it with arms.
"The Americans will take their dream of visiting our military and sensitive sites to their graves".
Officials at the UN agency told Reuters that despite the us demand that it inspect military sites, the United States has presented no new evidence of possible violations of the nuclear accord that could justify such a move.
IAEA monitors Iran's compliance via site visits, remote monitoring, containment seals, and satellite imagery.
Iran's stock of so-called heavy water - a moderator used in a type of reactor that can produce plutonium - stood at 111 tonnes, below the 130-tonne limit agreed in the deal, the report said, adding that Iran had restarted production of heavy water on June 17 after a maintenance shut-down of the plant on April 27. In July he told the Wall Street Journal he "would be surprised if they were in compliance".
However, the IAEA officials said they would not help the Trump administration make a false case for abandoning the agreement.
"We're not going to visit a military site like Parchin just to send a political signal", an IAEA official said. Yet, Trump has violated the JCPOA and continues to hold the fate of the accord in doubt by threatening to withhold a Congressionally-mandated certification of Iran's compliance in mid-October, which would trigger expedited consideration of snapback sanctions.
Following months of negotiations, the long-awaited deal was signed between Tehran and major world powers - the US, France, Britain, Russia, and China, plus Germany.
Iranian President Hassan Rouhani later said the USA call was unlikely to be accepted by the IAEA. Since sanctions began to roll back, Iran has made multibillion-dollar deals with a number of foreign companies previously barred from doing business with the country.
In a statement released by the U.S. Mission to the United Nations, the ambassador said under Security Council Resolution 2231, Iran is prohibited from exporting any and all arms without Security Council approval.