Four nuclear reactors are to be closed temporarily following a safety alert.
The need to investigate a fault in a boiler system means that the reactors will be out of action for around eight weeks.
Two reactors at Heysham, Lancashire, and two at Hartlepool, County Durham, will close tomorrow, according to French energy giant EDF
Together the four units serve three million homes, supplying 10 per cent of Britain’s nuclear power.
The fault, detected in a metal support tube, was found at the Heysham 1 site in Morecambe Bay. The other three reactors will be closed as a precaution because they have the same design.
The problems highlight concerns about Britain’s ageing power stations – no reactors have been built since 1995.