The graphite cores of two ageing nuclear reactors at Hunterston in North Ayrshire have begun to crumble as cracks spread.
One of the two cracked reactors at Hunterston B nuclear power station in North Ayrshire has been given permission to reopen - but only for four months.
The UK nuclear safety watchdog has boosted checks on two reactors in Scotland because of proliferating cracks in their graphite cores.
Pressure is mounting to keep two nuclear power reactors at Hunterston in North Ayrshire closed after the company that runs them, EDF Energy, said that it had found more cracks and was again postponing plans to restart.
More than 350 cracks have been discovered in an ageing nuclear power reactor at Hunterston in North Ayrshire, breaching an agreed safety limit and prompting calls for a permanent shutdown.
A report for local authorities says that nuclear plants are vulnerable to drone strikes, cyber attacks and terrorist infiltrators.