As part of the construction of Hinkley Point C, we will be dredging mud and sediment from the seabed off the Hinkley Point C site ahead of the drilling of six vertical shafts for the cooling water system. The cooling water system is a significant piece of infrastructure, which involves tunneling more than 3km out into the Bristol Channel.
In order to do this, it is necessary to dredge the immediate area where we will be installing the vertical shafts. This process will began in September 2018 and contractors have now completed the licensed work to dredge and deposit mud in the Severn Estuary. Further dredging will be required as the construction progresses and we will work closely with the appropriate experts to prepare our licence application and will again comply with all requirements. We also fully support all efforts to inform and explain the dredging work to the public.
EDF Energy is one of many companies - over many decades - dredging and depositing sediment in the Bristol Channel for industrial or construction purposes.
The sediment we and others are dredging in the Bristol Channel is typical of the sediment found anywhere in the Bristol Channel, and as such it is no different to the sediment already at the Cardiff Grounds. It is not classed as radioactive under UK law and poses no threat to human health or the environment.