Competition with a shortlist
Competitive procedure with a selection stage: suppliers were shortlisted before being invited to bid.
Key facts
- Buyer
- Sellafield Limited · Nuclear
- Suppliers
- Amentum Clean Energy Ltd, A2R (Altrad Support Services Limited and AtkinsRéalis UK Limited), TDA (AtkinsRéalis UK, Amentum Clean Energy, Westinghouse Electric Company UK), NDS (Altrad Support Services Ltd, Cavendish Nuclear Ltd, Shepley Engineers Ltd)
- Value
- £6,200,000,000 across 5 lots
- Procedure
- Restricted procedure
- Sector
- Construction work · Construction work (CPV 45000000)
- Region
- North West
- Official notice
- 070297-2025 on Find a Tender
- Timeline
-
- Contract date30 Oct 2025
- Published3 Nov 2025Published 4 days after the contract date
Description
Lot 1 will consist of two Remediation Partners. The Remediation value stream will have a growing scope as more and more of the Sellafield site moves from operations into remediation and decommissioning. This will be reflected in a growing investment over the lifetime of the DNWP framework, subject to annual public sector funding constraints. Remediation is about cleaning up the Sellafield site over the next century as safely and cost-effectively as possible. As an asset reaches the end of its operational life, remediation addresses the nuclear, radiological and conventional risks through post-operation clean-out, decommissioning, demolition and land remediation. The focus of waste informed nuclear decommissioning up to 2040 includes clearing redundant buildings to make land available for beneficial re-use and preparing to decommission the UK’s oldest nuclear reactor complexes and nuclear fuel handling facilities.
Lots in this award
| Lot | Supplier | Value |
|---|---|---|
| Decommissioning Nuclear Waste Partnership (DNWP): Lot 1 - Remediation | Amentum Clean Energy Ltd | £1bn |
| Decommissioning Nuclear Waste Partnership (DNWP): Lot 1 - Remediation | A2R (Altrad Support Services Limited and AtkinsRéalis UK Limited) | £1.6bn |
| Decommissioning Nuclear Waste Partnership (DNWP): Lot 2 - Retrievals Ponds | TDA (AtkinsRéalis UK, Amentum Clean Energy, Westinghouse Electric Company UK) | £1bn |
| Decommissioning Nuclear Waste Partnership (DNWP): Lot 3 - Retrievals Silos | NDS (Altrad Support Services Ltd, Cavendish Nuclear Ltd, Shepley Engineers Ltd) | £1bn |
| Decommissioning Nuclear Waste Partnership (DNWP): Lot 4 - Integrated Nuclear Waste | A2R (Altrad Support Services Limited and AtkinsRéalis UK Limited) | £1.6bn |
About the suppliers
Amentum Clean Energy Ltd: every public contract they have won, plus their Companies House record (company 01120437).
A2R (Altrad Support Services Limited and AtkinsRéalis UK Limited): every public contract they have won.
TDA (AtkinsRéalis UK, Amentum Clean Energy, Westinghouse Electric Company UK): every public contract they have won.
NDS (Altrad Support Services Ltd, Cavendish Nuclear Ltd, Shepley Engineers Ltd): every public contract they have won.