3D Geological Modelling for a Safety Case Project

3D Geological Modelling for a Safety Case Project

NNL has carried out several projects in support of the Low Level Waste Repository's (LLWR) Safety Case needed to continue operations. One such project was to develop a 3D model representing the geology from the Quaternary Period (the most recent geological period) underneath the LLWR site. This incorporated the latest data from a recent geophysical survey of the site.

This type of 3D modelling is often difficult due to variations in the distribution of available data. In addition, data tends to decrease in quality as the size of the area studied increases - especially when looking at an area the size of the LLWR site. NNL was able to use mathematical algorithms to interpolate between data points and provide an accurate picture of the site.

In order to ensure LLWR had the most accurate map available, NNL also used a different modelling technique which relies on geological interpretation rather than mathematical interpolation. This second map meant that LLWR was provided with two equally valid but alternative geological models, ensuring they had the best available data to inform their future strategy.