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Costain appointed to Magnox Decommissioning Framework


22 June 2023

• Appointment will see Costain awarded a share of £485m

• Six-year contract will support Magnox as it decommissions sites

Costain has been awarded a place on a new six-year framework for Magnox Ltd. to support the company across 11 sites and deliver its decommissioning programme through to 2029.

The full programme of work, which is worth up to £485m, will contribute to the clean-up of the UK’s nuclear waste whilst reducing the environmental impact of the sites and helping to deliver the Nuclear Decommissioning Authority’s strategic goals. Costain has secured a position on both Lot 1 and Lot 2 of the framework utilising its full complex delivery and consultancy capability.

Sam White, managing director for the natural resources division, Costain, commented:

“Costain has been implementing innovative solutions to deal with legacy nuclear waste for over 20 years and these awards build on our decommissioning heritage with Magnox.

“Our previous work across the Magnox Fleet has been instrumental in moving sites towards Care and Maintenance – essentially de-fuelling, decommissioning and creating safestores. This work represents a significant milestone along the decommissioning journey towards eventual final site clearance.”

Magnox is a wholly owned subsidiary of the Nuclear Decommissioning Authority and Costain’s experience will support the safe and secure closure of the Magnox sites.

Paul Winkle, Magnox chief operating officer said:

“This new decommissioning framework contract builds on the success of the previous one. It is a key, collaborative business tool that will provide an efficient, cost-effective route to market to decommission, demolish or re-use redundant buildings.”

“Magnox created a 7,400 m2 demolition footprint last year – that’s the collective size of 45 tennis courts. This is a significant achievement for the company and all the supply chain partners involved. We’re looking to deliver even more this year and the new framework contract will simplify the procurement process to do that.”


Discover more about our nuclear team:

Applying a quality conscience to safety-critical major projects | Costain

Additional evaporative capacity, Sellafield | Costain


Enquiries: Jemma Savage, Headland

[email protected]

[email protected]


Notes to Editors

About Costain

Costain helps to improve people’s lives by creating connected, sustainable infrastructure that enables people and the planet thrive. We shape, create, and deliver pioneering solutions that transform the performance of the infrastructure ecosystem across the UK’s energy, water, transportation, and defence & nuclear markets.

We are organised around our customers anticipating and solving their challenges and helping to improve performance. By bringing together our unique mix of construction, consulting, and digital experts we engineer and deliver sustainable, efficient, and practical solutions.

For more information visit www.costain.com

About Magnox

Magnox Limited is a wholly owned subsidiary of the Nuclear Decommissioning Authority (NDA). Magnox is responsible for decommissioning first generation nuclear power stations Berkeley, Bradwell, Chapelcross, Dungeness A, Hinkley Point A, Hunterston A, Oldbury, Sizewell A, Trawsfynydd and Wylfa, and research sites Harwell and Winfrith. Magnox Limited is also responsible for electricity generation at hydroelectric plant Maentwrog.

As a division of Magnox Limited from 1 April 2023, Dounreay is responsible for the clean-up and demolition of the former centre of fast reactor research and development.