“The unplanned outages are controlled shutdowns of the power plant in order to perform precise remediation works on certain equipment, in addition to the annual corrective maintenance program , which require the shutdown of the units, as per the nuclear safety procedures,” Nuclearelectrica said in a statement Thursday.

The same reactor was disconnected last Friday, for maintenance works at the systems related to the classical part of the power plant, and restarted Sunday.

Nuclearelectrica operates Romania’s sole nuclear power plant in Cernavoda, whose two 700-megawatt reactors cover around 18% of the country’s electricity consumption.