The Secretary of the Iranian Nuclear Agency said it was a "terrorist act" of problems with the electrical systems of major nuclear facilities.
Several media outlets have reported the possibility of a cyberattack by hostile Israeli intelligence.
A spokesman for the Iranian Nuclear Agency announced on the morning of the 11th that there was a problem with the electrical system at a major nuclear facility in central Natanz.
Details have not been disclosed, but no one has been injured.
Regarding this nuclear facility, President Hassan Rouhani just announced on the 10th that he has put into operation a new high-performance centrifuge used for uranium enrichment.
The Commissioner of the Atomic Energy Agency, Saleh, said that the trouble was a "terrorist act" and that he had been attacked by someone, and that he would not hesitate to retaliate in the future.
The facility exploded and fired in a building developing a centrifuge last July, pointing out Iran's involvement by hostile Israel.
In addition, Israeli media have reported that there is a possibility of a cyber attack by the Israeli intelligence agency Mossad, according to Western countries and intelligence officials.
The U.S. and Iranian delegations have begun indirect talks this month as the U.S. Biden administration seeks to return to a nuclear deal with the former administration on the issue of Iran's nuclear program, while Israel is in the U.S. He has repeatedly shown his opposition to his return.