Iran has for the first time addressed concerns about the so-called “possible military dimensions” of its nuclear program, a new confidential IAEA report showed Friday.

Tehran provided the UN atomic watchdog with information related to detonators that can be used for a nuclear weapon under a key November interim nuclear deal, the quarterly report, seen by AFP and AP, showed.

In technical meetings in late April and earlier his week in Tehran, Iran provided “information and explanations, including showing documents, to substantiate its stated need and application of EBW (Explosive Bridge Wire detonators),” the report by IAEA director-general Yukiya Amano for member states, said.

“Iran showed information to the agency that simultaneous firing of EBW (Explosive Bridge Wire detonators) was tested for a civilian application,” it went on.

“This is the first time that Iran has engaged in a technical exchange with the agency on this or any other of the outstanding issues related to possible military dimensions to Iran’s nuclear program since 2008.”

The EBW issue was part of seven “practical measures” Iran agreed with world powers under a key November interim deal and due to be fulfilled by May 15.

Under the deal Iran agreed to roll back its nuclear program to make it virtually impossible to make an atomic bomb in exchange for some relief from international sanctions.

Iran cuts stockpile of high-enriched uranium

The UN nuclear agency says Iran has neutralized about four-fifths of its stockpile of higher-enriched uranium that could be turned quickly into the core of a nuclear weapon.

The agency says Iran now has less than 40 kilograms (90 pounds) of the material. That’s about a fifth of what it would need to for a weapon.

The UN’s International Atomic Energy Agency reported the development Friday in a confidential report obtained by The Associated Press.

Iran denies any interest in having atomic arms. But it has agreed to some nuclear concessions in exchange for a partial lifting of the sanctions that are crippling its economy under a deal in effect since January.

Diluting and converting its 20-percent enriched stockpile were among the Iranian commitments under the agreement.