In the test at the Bushehr nuclear power plant, "dummy" fuel rods were used, so no nuclear reaction began.

CNN: U.S.: Iran has material for nuclear bomb but still 'not close'

Reza Khazaneh, a former adviser to the head of Iran's Atomic Energy Organization (IAEO), told the semi-official news agency the tests will be carried out using "dummy" fuel rods without enriched uranium.

CNN: Iran to test nuclear power plant