VIENNA (Reuters) -U.N. nuclear watchdog chief Rafael Grossi provided an update on Monday on the situation at Iran's nuclear facilities after Israel launched military strikes and said there was no sign of further damage at the Natanz or Fordow enrichment sites.

Grossi and the International Atomic Energy Agency he heads had previously reported that the smallest of Iran's three enrichment plants, an above-ground pilot plant at the sprawling Natanz nuclear complex, had been destroyed.

While there was no sign of a physical attack on the bigger underground enrichment plant at Natanz, its power supply was destroyed, which may have damaged the uranium-enriching centrifuges there. No damage was seen at the Fordow plant dug into a mountain.

"There has been no additional damage at the Natanz Fuel Enrichment Plant site since the Friday attack, which destroyed the above-ground part of the Pilot Fuel Enrichment Plant," Grossi said in a statement to an exceptional meeting of his agency's 35-nation Board of Governors.

Having said over the weekend that Israeli strikes damaged four buildings at the Isfahan nuclear facilities including the uranium conversion facility that processes "yellowcake" uranium into uranium hexafluoride, the feedstock for centrifuges, so it can be enriched, he elaborated on the damage there.

"At the Esfahan nuclear site, four buildings were damaged in Friday's attack: the central chemical laboratory, a uranium conversion plant, the Tehran reactor fuel manufacturing plant, and the UF4 (uranium tetrafluoride) to EU metal processing facility, which was under construction," he said.

"The (International Atomic Energy) Agency is and will remain present in Iran. Safeguards inspections in Iran will continue as soon as safety conditions allow, as is required under Iran's NPT (Non-Proliferation Treaty) safeguards obligations," he added.

(Reporting by Francois MurphyEditing by Bernadette Baum, Editing by William Maclean)