A reactor has been shut down at the Torness nuclear power plant due to a problem with a valve.
Reactor Two at the plant, near Dunbar, was closed on Thursday morning after workers found a fault.
EDF Energy said there were no safety or environmental impacts associated with the closure, which is expected to be short term.
Electricity is still being generated from Reactor One and maintenance work is ongoing at Reactor Two.
Paul Winkle, station director, said : “Whilst carrying out routine maintenance in the conventional turbine part of the plant there was an issue with a valve and our operations team took prompt action and manually shut down the reactor, putting safety first.
“Cooling to the reactor was maintained at all times and there were no safety, health or environmental impacts.
“The reactor will be returned to power as soon as maintenance is satisfactorily completed.”