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Flood Defence Wall at Dungeness Nuclear Power Station

Over 1500m over reinforced flood defence wall and foundation

When EDF Energy identified that a major improvement to flood defenses and security was needed at its costal nuclear facility at Dungeness, Kent the organisation quickly turned to the proven combination of Allens Security and Extrudakerb to assist in a challenging accelerated project delivery of a high profile design and build package through EDF’s framework supply chain..

Previously the combination had successfully provided hostile vehicle mitigation barrier with high performance intruder fencing at Hinckley Point B nuclear power station. At Dungeness though the challenges faced were far more complex and the input required through design and construction more demanding.

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Extrudakerb again employed Norder Design consultancy where relations were proven and developed over a number of similar schemes. Following a number of site visits a concept design for a reinforced concrete flood wall were completed allowing a budget price and program to be submitted and agreed with the Client.

Order placement soon led to site establishment and detailed design development.

To meet rapidly developing design Extrudakerb relied heavily on its carefully selected supply chain with material deliveries often arriving just in time.

Construction featured a combination of traditional formwork construction together with slipform paving where space and layout allowed.

Extrudakerb provided a site team that was able to evolve to meet and solve the challenges that this environment unavoidably create.


In total 4500 tonnes of reinforcement was erected and 3000 m3 of high strength concrete placed. Modular steel formwork was utilised, designed and fabricated off site by Extrudakerb’s in house division allowing the project program’s critical path to be adhered to.

Productivity was at times remarkable with in excess of 150m3 of concrete placed within an 8 hour shift.

The project workforce was fluid both in terms of quantity and skills as required by the works being undertaken. On site permanent project management and engineering ensured that EDF’s rigorous processes and demands were met including security, safety and environmental management of a location that features areas of special scientific interest.

Target costs were met, program was met, remedial works were practically non-existent and already strong relationships matured and improved.