STORY: Russian forces captured the plant, Europe's largest, in March 2022 and it has repeatedly come under fire in recent months, raising fears of a nuclear disaster. Grossi is working to set up a safe zone around the facility.
Grossi, speaking to reporters in the Ukrainian capital Kyiv, said a nuclear accident could happen any day and reiterated the situation at the plant was very precarious.
"I worry that this is becoming routine, that people may believe that nothing has happened so far, so is the director general of the IAEA crying wolf?" he said.