Reuters:

Iran and the major powers with which it reached a landmark nuclear accord in 2015 have agreed on clarifications that diplomats say will reduce the amount of enriched uranium that counts towards a limit set by the deal.

The IAEA has already expressed concern to Iran about its repeated testing of one of the deal's less strictly defined limits - its stock of heavy water, a substance used as a moderator in reactors like Iran's unfinished one at Arak, which has had its core removed to make it unusable.

Diplomats have said Iran has come close to exceeding other limits under the deal, particularly the 300 kg (661 pound) cap on its stock of enriched uranium, a breach of which would most likely be far more damaging than excess heavy water.

There was concern during a visit to Iran this week by IAEA chief Yukiya Amano that Iran was about to go over that threshold, diplomats said. There is also great uncertainty about how U.S. President-elect Donald Trump, a vocal critic of the deal, will handle any future difficulties that arise with Iran.

How much difference exactly the clarifications will make to the size of Iran's uranium stockpile is not clear.

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