It's 50 years since the Sellafield magnox reprocessing plant began operating.
In that time, the West Cumbrian facility has reprocessed more than 50,000 tonnes of spent nuclear fuel.
It will reprocess a further 3,000 tonnes before it closes in six years' time.
The plant separates spent fuel rods into plutonium and uranium which could be reused in power station in the future.
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Almost half a million pounds from the Heritage Lottery Fund will protect the remains of the former copper mines in Coniston.
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His father, Secretary of State for Scotland David Mundell, is one of the highest profile Remain supporters north of the border.