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AwardedUnited KingdomWorks£4,600,000,000

Decommissioning Nuclear Waste Partnership

Published
Published 10 November 2025
Deadline
Closed 27 June 2024

Overview

Sellafield Ltd is responsible for safely operating and decommissioning Europe's largest, most complex nuclear site, which is home to legacy nuclear facilities that are some of the most hazardous buildings in Western Europe. Sellafield Ltd, through the Decommissioning and Nuclear Waste Partners (DNWP) Framework opportunity, has brought together four partners across four Lots to provide a full suite of expertise and support to deliver decommissioning activities and projects, including asset care. Delivery will be across nuclear facilities on the Sellafield licenced site that are in mix of states including operational, post operation clean out (POCO), decommissioning and demolition. Consequently, the scope of work for the DNWP Framework will include construction delivery, demolition related works, associated technical services (including safety case and design) and waste management with the scope aligned across the following four Lots: Lot 1 Remediation Partners Lot 2 Pond Retrievals Partner Lot 3 Silos Retrievals Partner Lot 4 Integrated Nuclear Waste Partner Lot 1 will consist of two Remediation Partners. 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. Lot 2 will consist of a Ponds Partner, encompassing both the First Generation Magnox Storage Pond ("FGMSP") , associated buildings and the Pile Fuel Storage Pond ("PFSP"). and associated buildings. Legacy Ponds is the Operating Unit (OU) organisation within the Retrievals value stream of Sellafield that is charged with managing the programmes of work for the FGMSP and the PFSP. These are two legacy nuclear storage ponds that retain significant radiological materials and hazards that require timely mitigation, principally by retrieving the materials to downstream treatment and storage/disposal facilities while maintaining a safe and secure environment. Lot 3 will consist of a Silos Partner, encompassing both the Magnox Swarf Storage Silo ("MSSS") and Pile Fuel Cladding Silo ("PFCS"). The Retrievals value stream is responsible for managing the site's major hazard and risk reduction programme: retrieving the waste from Sellafield's four highest risk legacy storage facilities. Lot 4 will consist of a single enterprise-wide Integrated Nuclear Waste Partner. This Nuclear Waste Partner will work through the Waste Operating Unit ("Waste OU"). The Waste OU is part of the Remediation Portfolio, it includes a dedicated programme providing enabling activities across the Sellafield enterprise with major customers being the DNWP Remediation & Retrievals Partners.

Key details

Country
United Kingdom
Status
Awarded
Category
Works
Estimated value
£4,600,000,000
Procedure
Selective
SME suitable
No
Published
10 November 2025
Deadline
Closed
Classification (CPV)
Engineering works and construction works

Award outcome

Awarded value
£4,600,000,000
Award date
30 October 2025
Contract period
30 October 2025 → 30 October 2040
Winners
  • A2R (Altrad Support Services Limited and AtkinsRéalis UK Li
  • Amentum Clean Energy Limited
  • NDS (Altrad Support Services Ltd, Cavendish Nuclear Ltd, Shepley
  • TDA (AtkinsRéalis UK, Amentum Clean Energy, Westinghouse El

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Notice history

Every published notice in this contracting process, newest first.

  1. Contract Award Notice

    10 November 2025

Contracting authority

  • Sellafield Limited

    Buyer

    Seascale, United Kingdom

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Awarded: Decommissioning Nuclear Waste Partnership — won by A2R (Altrad Support Services Limited and AtkinsRéalis UK Li +3 — Skim