AFP - As the smoke began to leak late Monday afternoon from the reactor 2 of the Fukushima nuclear power plant (north-eastern Japan) but that coming out of the reactor 3 was arrested, said Nuclear Safety Agency.
"Around 6:20 p.m. (9:20 GMT), white smoke began to emerge from a crack in the roof of the reactor 2," said a spokesman.
Repairs were underway at the reactor to reactivate some of the equipment, especially in the control room.
Two hours earlier, another smoke from gray to black, had begun to escape from the reactor 3, but it did not last.
"TEPCO has informed us that the black smoke came from the reactor 3, but it stopped at 6:02 p.m. ET radiation levels remained stable," said a spokesman for the agency.
The agency gave no explanation of the origin of this incident, but according to experts, it was not steam but with smoke from something that burned.
Unit 3 has sustained the most damage after the earthquake and tsunami of 11 March: the roof top was completely destroyed by a huge explosion last week due to an accumulation of hydrogen resulting from operations of depressurization .
Unit 3 is the most worrying because it contains MOX fuel, a mixture of plutonium oxide and uranium derived from recycled products, which releases are considered more harmful than those from a uranium-based fuel .