DUBAI, Sept 11 (Reuters) - U.N. nuclear watchdog chief Rafael Grossi will travel to Iran on Saturday to meet the head of the Iranian atomic agency, Iran"s envoy to the IAEA said on Twitter, confirming a Reuters report about the visit. read more Kazem Gharibabadi wrote in a tweet: "@rafaelmgrossi will travel to Tehran this afternoon. He will meet Vice-President and head of the AEOI (Atomic Energy Organization of Iran) tomorrow".