Reactor two at Torness Nuclear Power Station, near Dunbar, is back generating electricity for the National Grid after its three yearly statutory maintenance.
The operation did take longer than expected as extra work was needed to repair an in-service inspection standpipe. The reactor went back on line on Thursday, August 9 at 10.10pm.
The nuclear regulator, the Office for Nuclear Regulation, was kept fully informed throughout the process and worked closely with station staff on the issue.
Paul Winkle, station director, said: “I would like to take this opportunity to thank our staff and many contractors for their hard work and dedication over the last few months.
“The outage did take longer than expected, but our priority was always to carry out the tasks in a safe manner and return to unit to service as quickly and as safely as possible, and that is exactly what we have done.”