Iran has agreed to start addressing suspicions that it may have worked on designing an atomic weapon.
Tehran will provide information about detonators, according to the UN nuclear agency, the IAEA.
While rejecting Western claims that its atomic activities have a military purpose, Iran says it will work with the IAEA to clear up what are being called “ambiguities”.
However, Iran’s Deputy Foreign Minister Abbas Araghchi, also a senior nuclear negotiator, says his country’s defensive affairs are non-negotiable in separate talks with world powers.
Shortly after Tehran and the IAEA signed a cooperation deal in November, an interim accord was struck between Iran and the six powers – the United States, France, Germany, Britain, China and Russia.
Iran has agreed to curb its nuclear work in exchange for the easing of some sanctions.
High-stakes negotiations between Iran and the six countries, due to start on February 18 in Vienna, are aimed at reaching a broader diplomatic settlement with the Islamic state.