Decommissioning Nuclear Waste Partnership (DNWP)

A Contract Award Notice
by SELLAFIELD LIMITED

Source
Find a Tender
Type
Framework (Works)
Duration
15 year (est.)
Value
£2B
Sector
CONSTRUCTION
Published
03 Nov 2025
Delivery
06 Oct 2025 to 05 Nov 2040 (est.)
Deadline
n/a

Related Terms

Location

Sellafield Site

Geochart for 2 buyers and 5 suppliers

Description

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 Division

1 Remediation

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.

2 Retrievals Ponds

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.

3 Retrievals Silos

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. These buildings have traditionally presented some of the greatest challenges on the Sellafield site, but major progress is now being made on retrieving waste from the two ponds and the MSSS, with final preparations being made to retrieve waste from the PFCS.

4 Integrated Nuclear Waste

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.

Award Detail

1 Amentum Clean Energy (Warrington)
  • Lot 1 - Remediation
  • Num offers: 5
  • Value: £1,000,000,000
  • Subcontracting opportunities are expected.
2 A2R Altrad Support Services (Whitehaven)
  • Lot 1 - Remediation
  • Num offers: 5
  • Value: £1,600,000,000
  • Subcontracting opportunities are expected.
3 Tda Atkinsréalis UK Amentum Clean Energy Westinghouse Electric (Moor Row)
  • Lot 2 - Retrievals Ponds
  • Num offers: 1
  • Value: £1,000,000,000
4 NDS Altrad Support Services (Warrington)
  • Lot 3 - Retrievals Silos
  • Num offers: 1
  • Value: £1,000,000,000
  • Subcontracting opportunities are expected.
5 A2R Altrad Support Services (Whitehaven)
  • Lot 4 - Integrated Nuclear Waste
  • Num offers: 3
  • Value: £1,600,000,000

Award Criteria

Technical 70.0
PRICE 30.0

CPV Codes

  • 45000000 - Construction work
  • 79410000 - Business and management consultancy services
  • 42000000 - Industrial machinery
  • 45315100 - Electrical engineering installation works
  • 71322000 - Engineering design services for the construction of civil engineering works
  • 71320000 - Engineering design services
  • 45210000 - Building construction work
  • 98391000 - Decommissioning services
  • 71321000 - Engineering design services for mechanical and electrical installations for buildings
  • 79400000 - Business and management consultancy and related services
  • 45100000 - Site preparation work
  • 45111200 - Site preparation and clearance work
  • 79723000 - Waste analysis services
  • 79415200 - Design consultancy services
  • 45220000 - Engineering works and construction works
  • 44421722 - Safety cases
  • 45111000 - Demolition, site preparation and clearance work
  • 45111213 - Site-clearance work
  • 45351000 - Mechanical engineering installation works
  • 71530000 - Construction consultancy services
  • 43320000 - Construction equipment
  • 22314000 - Designs
  • 79933000 - Design support services
  • 45222110 - Waste disposal site construction work

Indicators

  • Award on basis of price.

Reference

  • FTS 070297-2025

Domains