Fars quoted Ali Akbar Salehi, head of Iran's Atomic Energy Organisation, as saying the country could disregard the limit "whenever we wish, and would do the enrichment at any volume and level."
If Iran took such a step, it would be the first time the nation had deliberately reduced compliance with the nuclear agreement, which disarmament advocates have described as a major achievement.
Political analysts said Iran was unlikely to renounce the agreement, known as the Joint Comprehensive Plan of Action, because that could alienate the European countries, as well as China and Russia, that have sought to preserve the accord despite the US withdrawal.
"Iran is about to reduce its compliance with the JCPOA, but not formally withdraw," said Cliff Kupchan, chairman of the Eurasia Group, a political risk consultancy. "That's a distinction with a big difference."
While Iran may increase its stockpile of enriched uranium and possibly test advanced centrifuges, Kupchan said, "I doubt they'll take drastic steps in these areas, and Iran will continue to comply with other important aspects of the JCPOA."
Relations between Iran and the United States have worsened substantially under the Trump administration, which has imposed onerous sanctions on the Iranians since the president renounced the nuclear agreement May 8, 2018.
The administration has sought to drive exports of Iranian oil to near zero and has designated the Islamic Revolutionary Guards Corps as a terrorist organisation, among other actions. The Iranians have responded so far by designating the US Central Command as a terrorist organization, suggesting that American forces posted in other countries are at risk from Iranian attack.
On Sunday the administration said it was strengthening US military deployment in the Persian Gulf in response to what it called an increased Iranian threat.
The risk of an armed confrontation between Iran and the United States figures prominently in a statement signed by a bipartisan group of more than 60 national security experts, exhorting the administration to rejoin the nuclear agreement. The group, known as the National Coalition to Prevent an Iranian Nuclear Weapon, had planned to release the statement on the anniversary of the US withdrawal.
"The US unilateral withdrawal from the JCPOA on May 8, 2018 significantly undermined America's national security and has fueled momentum for a possible new conflict in the Middle East," the signers wrote. "If Iran also withdraws from the JCPOA, or from the Nuclear Non-proliferation Treaty (NPT), the trans-Atlantic alliance will be dealt a severe blow and a Middle Eastern nuclear arms race could ensue."
The group has long opposed Trump's position on the accord and had urged him to abide by it in the months before he scrapped the agreement.
Written by: Rick Gladstone
© 2019 THE NEW YORK TIMES