Sellafield Ltd has awarded a framework with a maximum value of £4.6bn to support high hazard risk reduction programmes on the Sellafield site in Cumbria, through the Decommissioning & Nuclear Waste Partnership (DNWP).
The framework agreement will be in place for up to 15 years. DNWP will support activities related to retrieving waste materials from the site’s oldest facilities as well as treating and storing those materials and decommissioning redundant assets.
DNWP will replace and build on the past capabilities delivered through the existing Design Services Alliance (DSA) and the Decommissioning Delivery Partnership (DDP) ahead of their expiry.
The confirmed winners of the four lots are:
Lot 1: Remediation

- A2R (AtkinsRéalis and Altrad Support Services)
- Amentum (founded in 2020 as a spin-out of the management services group of Aecom)
Lot 2: Retrievals
- The Decommissioning Alliance (AtkinsRéalis, Amentum and Westinghouse Electric Company UK)
Lot 3: Retrievals
- Nuclear Decommissioning Solutions (Altrad Support Services, Cavendish Nuclear and Shepley Engineers)
Lot 4: Integrated nuclear waste partner
- A2R (AtkinsRéalis and Altrad Support Services)
Sellafield Ltd chief supply chain officer James Riddick explained: “Cleaning up the legacy of historic operations on our site is at the heart of our mission. It is important that we achieve this safely, efficiently, and sustainably – our supply chain, and this partnership plays a key role in that.
“We’re pleased to welcome our new partners. Their specialist capabilities and teams, working alongside our skilled Sellafield workforce, will help us deliver our mission and drive progress both on site and across our wider community.”
Got a story? Email news@theconstructionindex.co.uk



