|Nuclear Power Station Earthing Design Verification & Construction Safety
|South West England
A sufficient and effective earthing system is important for large installations such as power stations.
ERM was asked to verify the proposed earthing design against UK standards, including ERM’s previous experience designing the earthing system for the new 400kV connection substation and verifying the designs for the existing 400kV and 275kV substations.
The scale of the site, its varying elevation and the proposed use of a back fill material made this a challenging project.
The size of the power station earthing system, along with the adjacent interconnected sites and requirement to represent a multilayer soil model including backfill representation made the construction and processing of a CDEGS model difficult.
ERM built a bespoke top-end PC to give sufficient processing power to run this model in a timely manner. Regular liaison with the client throughout the project allowed ERM to understand the breadth of the project including associated areas such as construction techniques and installation methods proposed.
The range of practical and technical experience at ERM allowed us to not only deliver the customer’s requirements but to provide advice value engineering advice, which subsequently provided significant safety improvements and savings in excess of £1M.
The earthing design was approved from a safety viewpoint and significant cost savings were identified during value engineering both for the design itself and for its construction. The saving exceeded £1M. Safety hazards with 11kV construction supplies were identified and designed out with a pragmatic solution that required little ongoing management.
The finished product was a detailed model with the functionality required to examine, calculate and draw the above conclusions.