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Iran Takes Stand On Nuclear Deal Provision That Clashes With U.S. View

Iran has been producing heavy water for its Arak nuclear reactor, which currently is not operating.

Iran is questioning a provision of its nuclear deal with world powers in a way that could lead to confrontation with the United States.

The 2015 deal restricts Iran from accumulating a large stock of heavy water, which is used in scientific research as well as in nuclear reactors that produce plutonium.

Iran has been producing heavy water in large quantities and has already exceeded a prescribed 130-ton limit on its stock twice.

Tehran defused a standoff with Washington over the issue in December by shipping excess water to Oman, where it is being stored until a buyer can be found.

In a letter to the United Nations nuclear watchdog made public on March 17, Iran is arguing that the deal does not require it to ship excess water out of the country if it can't immediately find buyers.

The deal only says all excess water "will be made available for export to the international market based on international prices and delivered to the international buyer," Tehran argued.

But the Trump White House has taken a tough stand on strictly enforcing the nuclear deal and the United States last week told the UN that "any excess heavy water...cannot remain in Iran."

Based on reporting by Reuters and