UN nuclear watchdog chief Rafael Grossi said Saturday he had "constructive" talks with Iranian officials in Tehran after the discovery of uranium particles enriched to near weapons-grade level.

The two-day visit by the head of the International Atomic Energy Agency (IAEA) chief director general comes as the Vienna-based organisation seeks greater cooperation with Iran over its nuclear activities.

"By having a constructive discussion... and having good agreements, like I am sure we are going to have, we are going to be paving the way for important agreements," Grossi told a news conference alongside Iran's top nuclear official Mohammad Eslami.

In his series of meetings with Iranian officials, Grossi met President Ebrahim Raisi.

Raisi acknowledged that "cooperation is a two-way street... (and) can continue based on maintaining the agency's independence and the rights of the Iranian nation," the political deputy of Iran's presidency, Mohammad Jamshidi tweeted.

A diplomatic source earlier told AFP that the meeting with Raisi was aimed to "relaunch the dialogue" on Iran's atomic work and to "reset the relationship at the highest level".

Grossi arrived Friday in Iran amid deadlock in negotiations on reviving a landmark 2015 accord on Iran's nuclear activity, known formally as the Joint Comprehensive Plan of Action, or JCPOA.

Iran denies wanting to acquire atomic weapons, and says it had made no attempt to enrich uranium beyond 60-percent purity.

(AFP)

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