The Fukushima Dai-Ichi nuclear power plant devastated by a tsunami two years ago continues to bring bad news to Tokyo Electric Power Co (TEPCO).

On Monday, March 18, at 6:57am local time, an electricity outage disabled nine facilities at the Fukushima plant, including cooling systems of the four storage pools for used fuel rods.

TEPCO dispatched 25 specialists to deal the problem, but it took all of 30 hours for technicians to repair the systems.

On Wednesday, just 12 minutes after midnight (15:12 GMT), power supply to the cooling systems was fully restored, reported TEPCO. However, certain questions remain.