Here's yet another version of events:

http://news.yahoo.com/news?tmpl=stor...a/iran_nuclear

....
Work at some parts of the Isfahan plant began
Monday, but other, more sensitive units - including
the one that ultimately produces UF-6 - had remained
under U.N. seal. Iran notified the IAEA on Tuesday
that it wanted the seals removed - saying the IAEA
could either do so itself or authorize Iranian officials
to break them under IAEA supervision.

"The IAEA said in a letter to us today that it gives
(the Atomic Energy Organization of Iran) permission
to remove the seals and fully restart activities at
the facility," Mohammad Saeedi, Iran's deputy nuclear
chief, told state-run television Wednesday.

--

FF