The fate of the Arak reactor in central Iran was one of the toughest sticking points in the long nuclear negotiations that led to the agreement, signed by Iran with the United States, Britain, France, China, Russia and Germany.
In the redesign, the heavy water reactor will be reconfigured so it cannot yield fissile plutonium usable in a nuclear bomb.
China and the United States are joint heads of the working group on the Arak project, and progress has been smooth, Lu told a daily news briefing.
Iran has said that the 40-megawatt, heavy-water plant is aimed at producing isotopes for cancer and other medical treatments, and has denied that any of its nuclear activity is geared to developing weapons.
The announcement comes as U.S. Secretary of State Rex Tillerson accused Iran of "alarming ongoing provocations" to destabilise countries in the Middle East as the Trump administration launched a review of its policy towards Tehran.
Tillerson said the review would not only look at Iran's compliance with the 2015 nuclear deal but also its behaviour in the region which he said undermined U.S. interests in Syria, Iraq, Yemen and Lebanon.
Lu, while not directly referring to Tillerson's comments, said China hopes all parties could ensure the nuclear deal was implemented, appropriately handle disagreements and make positive contributions to nuclear non-proliferation and peace and stability in the Middle East.
(Reporting by Ben Blanchard; Editing by Robert Birsel) ((firstname.lastname@example.org; +86 10 6627 1201; Reuters Messaging: email@example.com))
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