An investigation is under way following a radioactive leak at the Torness nuclear power station.
Health and safety officials were alerted after the problem was found during a routine inspection.
The incident was one of three reported to ministers from UK plants which are now under investigation by the Office for Nuclear Regulation (ONR).
Groundwater at the Dunbar plant was found to be contaminated with radioactive tritium, which was leaking from two pipelines.
They were serious enough to be reported to ministers under safety guidelines agreed after the Chernobyl accident in Ukraine 25 years ago.
According to the ONR, the response to the incidents from the companies that run the plants was “appropriate”.
The pipelines at Torness were put out of use after the leak was discovered.
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