National Geological Screening for a GDF - Wales region
Our work shows that we may find a suitable geological setting for a GDF in most of this subregion.
Given that most of this subregion is the inshore area which extends to 20km from the coast, rock can only be seen at the surface at a few locations in the Vale of Clywd including man-made excavations such as quarries or road cuttings. A small number of boreholes and geophysical investigations give us an understanding of the geology at depth.
There are clay-rich rock layers under most of the subregion in which we may be able to site a GDF. There may also be layers of rock salt under the northern half of the subregion in which we may be able to site a facility. We would need to do more work to find out whether these rocks have suitable properties and thicknesses.
Even where individual clay-rich rock layers are found not to be thick enough to host a GDF they may support the siting of a GDF in deeper rocks as they could act as a barrier to groundwater flow from depth. This is important because movement of groundwater is one of the ways in which radioactive material could be carried back to the surface.
Parts of this area, off the coast around Rhyl, are Coal Authority Licence Areas allowing companies to explore for coal. It is not known whether coal in these licence areas will be exploited. RWM will continue to monitor how this exploration programme progresses.
For further information, read the report below.
We have produced a summary of the geological attributes of Wales