Sizewell B nuclear power station is back on line after being shut down for safety reasons for four days.
The reactor was taken out of service at 4am on Tuesday after low levels of oil were detected on a cooling pump.
Power station owner EDF said Sizewell B was safely returned to service at 8.30pm on Friday night.
Jim Crawford, station director of Sizewell B said: 'Our highly trained engineers have completed repairs on the cooling pump which has enabled us to safely return Sizewell B back to service within the short timescales planned.'
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