The Scottish Environment Protection Agency has issued a final warning letter to British Energy’s Ayrshire nuclear power plant in Scotland following an incident where radioactive waste was discharged into the sea, The Press and Journal reported.

On 15 May this year 570 gallons of low-level waste was reportedly leaked into the Firth of Clyde from Hunterston B plant in Ayrshire before it was sampled for effluent quality as required under the disposal procedures.

The letter warns of enforcement action being taken against the company in case of further contravention of legislation.

British Energy said the mishap occurred during a routine maintenance operation to ‘leak test’ a pipe on the discharge route from the waste facility.

The company spokesman said the discharge did not harm the environment as its volume and levels were safe.