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Workers were forced to evacuate the Dounreay nuclear power station in the Scottish Highlands after the discovery of radioactive contamination, it has been revealed.
Site bosses blamed "human error" for the incident, according to the Press and Journal newspaper.
They also said that there was "insignificant" low-level contamination but no harm has come of the leak.
The incident happened on June 7 but has only just been made public following the Dounreay Stakeholder Group on Wednesday evening.
According to reports, workers were forced to leave the plant after follow-up surveys found a number of other contamination 'hotspots'.