One of the reactors at the ageing Hunterston nuclear power station in North Ayrshire has been plagued by two serious new breakdowns.
Two large gas circulators vital for cooling the reactor and preventing meltdown were damaged when the lubricating oil was mistakenly switched off. And on Thursday the reactor had to be shut down because its turbine generator was shaking more than it should.
These latest mishaps come after the discovery of two new cracks in the reactor's graphite bricks, as well as a rash of nuclear incidents across Scotland during the week.