Section one: Contracting authority
one.1) Name and addresses
Sellafield Limited
Hinton House, Birchwood Park Avenue
Warrington
WA3 6GR
Contact
Michelle Edmondson
michelle.a.edmondson@sellafieldsites.com
Country
United Kingdom
Region code
UKD1 - Cumbria
National registration number
01002607
Internet address(es)
Main address
https://www.gov.uk/government/organisations/sellafield-ltd
Buyer's address
https://www.gov.uk/government/organisations/sellafield-ltd
one.4) Type of the contracting authority
Body governed by public law
one.5) Main activity
Other activity
Nuclear Decommissioning
Section two: Object
two.1) Scope of the procurement
two.1.1) Title
Decommissioning Nuclear Waste Partnership (DNWP)
two.1.2) Main CPV code
- 45000000 - Construction work
two.1.3) Type of contract
Works
two.1.4) Short 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
two.1.6) Information about lots
This contract is divided into lots: Yes
two.1.7) Total value of the procurement (excluding VAT)
Value excluding VAT: £4,600,000,000
two.2) Description
two.2.1) Title
Lot 1 - Remediation
Lot No
1
two.2.2) Additional CPV code(s)
- 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
- 45000000 - Construction 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
two.2.3) Place of performance
NUTS codes
- UKD11 - West Cumbria
Main site or place of performance
Sellafield Site
two.2.4) Description of the procurement
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.
two.2.5) Award criteria
Quality criterion - Name: Technical / Weighting: 70
Price - Weighting: 30
two.2.11) Information about options
Options: No
two.2.13) Information about European Union Funds
The procurement is related to a project and/or programme financed by European Union funds: No
two.2) Description
two.2.1) Title
Lot 2 - Retrievals Ponds
Lot No
2
two.2.2) Additional CPV code(s)
- 45000000 - Construction work
- 45220000 - Engineering works and construction works
- 45351000 - Mechanical engineering installation works
- 79400000 - Business and management consultancy and related services
- 45222110 - Waste disposal site construction work
- 45100000 - Site preparation work
- 45111000 - Demolition, site preparation and clearance work
- 45111200 - Site preparation and clearance work
- 79723000 - Waste analysis services
- 79415200 - Design consultancy services
- 71320000 - Engineering design services
- 45315100 - Electrical engineering installation works
- 71322000 - Engineering design services for the construction of civil engineering works
- 44421722 - Safety cases
- 43320000 - Construction equipment
- 71530000 - Construction consultancy services
- 98391000 - Decommissioning services
- 45000000 - Construction work
- 42000000 - Industrial machinery
- 45111213 - Site-clearance work
- 22314000 - Designs
- 71321000 - Engineering design services for mechanical and electrical installations for buildings
- 79933000 - Design support services
- 79410000 - Business and management consultancy services
- 45210000 - Building construction work
two.2.3) Place of performance
NUTS codes
- UKD11 - West Cumbria
Main site or place of performance
Sellafield Site
two.2.4) Description of the procurement
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.
two.2.5) Award criteria
Quality criterion - Name: Technical / Weighting: 70
Price - Weighting: 30
two.2.11) Information about options
Options: No
two.2.13) Information about European Union Funds
The procurement is related to a project and/or programme financed by European Union funds: No
two.2) Description
two.2.1) Title
Lot 3 - Retrievals Silos
Lot No
3
two.2.2) Additional CPV code(s)
- 45000000 - Construction work
- 45210000 - Building construction work
- 45315100 - Electrical engineering installation works
- 71530000 - Construction consultancy services
- 79410000 - Business and management consultancy services
- 71320000 - Engineering design services
- 98391000 - Decommissioning services
- 71321000 - Engineering design services for mechanical and electrical installations for buildings
- 79723000 - Waste analysis services
- 79933000 - Design support services
- 45222110 - Waste disposal site construction work
- 45351000 - Mechanical engineering installation works
- 45111213 - Site-clearance work
- 43320000 - Construction equipment
- 44421722 - Safety cases
- 79400000 - Business and management consultancy and related services
- 45220000 - Engineering works and construction works
- 45000000 - Construction work
- 79415200 - Design consultancy services
- 22314000 - Designs
- 45100000 - Site preparation work
- 45111000 - Demolition, site preparation and clearance work
- 42000000 - Industrial machinery
- 45111200 - Site preparation and clearance work
- 71322000 - Engineering design services for the construction of civil engineering works
two.2.3) Place of performance
NUTS codes
- UKD11 - West Cumbria
Main site or place of performance
Sellafield Site
two.2.4) Description of the procurement
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.
two.2.5) Award criteria
Quality criterion - Name: Technical / Weighting: 70
Price - Weighting: 30
two.2.11) Information about options
Options: No
two.2.13) Information about European Union Funds
The procurement is related to a project and/or programme financed by European Union funds: No
two.2) Description
two.2.1) Title
Lot 4 - Integrated Nuclear Waste
Lot No
4
two.2.2) Additional CPV code(s)
- 45000000 - Construction work
- 45111200 - Site preparation and clearance work
- 45351000 - Mechanical engineering installation works
- 79933000 - Design support services
- 22314000 - Designs
- 45210000 - Building construction work
- 79415200 - Design consultancy services
- 98391000 - Decommissioning services
- 45000000 - Construction work
- 45220000 - Engineering works and construction works
- 45111200 - Site preparation and clearance work
- 43320000 - Construction equipment
- 71320000 - Engineering design services
- 71321000 - Engineering design services for mechanical and electrical installations for buildings
- 45222110 - Waste disposal site construction work
- 79723000 - Waste analysis services
- 42000000 - Industrial machinery
- 71530000 - Construction consultancy services
- 79410000 - Business and management consultancy services
- 71322000 - Engineering design services for the construction of civil engineering works
- 45100000 - Site preparation work
- 44421722 - Safety cases
- 45111000 - Demolition, site preparation and clearance work
- 45111213 - Site-clearance work
- 79400000 - Business and management consultancy and related services
- 45315100 - Electrical engineering installation works
two.2.3) Place of performance
NUTS codes
- UKD11 - West Cumbria
Main site or place of performance
Sellafield Site
two.2.4) Description of the procurement
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.
two.2.5) Award criteria
Quality criterion - Name: Technical / Weighting: 70
Price - Weighting: 30
two.2.11) Information about options
Options: No
two.2.13) Information about European Union Funds
The procurement is related to a project and/or programme financed by European Union funds: No
Section four. Procedure
four.1) Description
four.1.1) Type of procedure
Restricted procedure
four.1.3) Information about a framework agreement or a dynamic purchasing system
The procurement involves the establishment of a framework agreement
four.1.8) Information about the Government Procurement Agreement (GPA)
The procurement is covered by the Government Procurement Agreement: Yes
four.2) Administrative information
four.2.1) Previous publication concerning this procedure
Notice number: 2023/S 000-022241
Section five. Award of contract
Lot No
1
Title
Lot 1 - Remediation
A contract/lot is awarded: Yes
five.2) Award of contract
five.2.1) Date of conclusion of the contract
30 October 2025
five.2.2) Information about tenders
Number of tenders received: 5
Number of tenders received from SMEs: 0
Number of tenders received from tenderers from other EU Member States: 0
Number of tenders received from tenderers from non-EU Member States: 0
Number of tenders received by electronic means: 5
The contract has been awarded to a group of economic operators: No
five.2.3) Name and address of the contractor
Amentum Clean Energy Limited
305 Bridgewater Place Birchwood Park, Birchwood
Warrington
WA36XF
Country
United Kingdom
NUTS code
- UKD6 - Cheshire
National registration number
01120437
The contractor is an SME
No
five.2.4) Information on value of contract/lot (excluding VAT)
Initial estimated total value of the contract/lot: £2,000,000,000
Total value of the contract/lot: £1,000,000,000
five.2.5) Information about subcontracting
The contract is likely to be subcontracted
Value or proportion likely to be subcontracted to third parties
Proportion: 41 %
Section five. Award of contract
Lot No
1
Title
Lot 1 - Remediation
A contract/lot is awarded: Yes
five.2) Award of contract
five.2.1) Date of conclusion of the contract
30 October 2025
five.2.2) Information about tenders
Number of tenders received: 5
Number of tenders received from SMEs: 0
Number of tenders received from tenderers from other EU Member States: 0
Number of tenders received from tenderers from non-EU Member States: 0
Number of tenders received by electronic means: 5
The contract has been awarded to a group of economic operators: No
five.2.3) Name and address of the contractor
A2R (Altrad Support Services Limited and AtkinsRéalis UK Limited)
Rutherford House, Westlakes Science Park
Whitehaven
CA24 3JZ
Country
United Kingdom
NUTS code
- UKD11 - West Cumbria
National registration number
n/a
The contractor is an SME
No
five.2.4) Information on value of contract/lot (excluding VAT)
Initial estimated total value of the contract/lot: £2,000,000,000
Total value of the contract/lot: £1,600,000,000
five.2.5) Information about subcontracting
The contract is likely to be subcontracted
Value or proportion likely to be subcontracted to third parties
Proportion: 41 %
Section five. Award of contract
Lot No
2
Title
Lot 2 - Retrievals Ponds
A contract/lot is awarded: Yes
five.2) Award of contract
five.2.1) Date of conclusion of the contract
30 October 2025
five.2.2) Information about tenders
Number of tenders received: 1
Number of tenders received from SMEs: 0
Number of tenders received from tenderers from other EU Member States: 0
Number of tenders received from tenderers from non-EU Member States: 0
Number of tenders received by electronic means: 1
The contract has been awarded to a group of economic operators: No
five.2.3) Name and address of the contractor
TDA (AtkinsRéalis UK, Amentum Clean Energy, Westinghouse Electric Company UK)
Rutherford House, Westlakes Science Park
Moor Row
CA24 3HY
Country
United Kingdom
NUTS code
- UKD11 - West Cumbria
The contractor is an SME
No
five.2.4) Information on value of contract/lot (excluding VAT)
Initial estimated total value of the contract/lot: £1,000,000,000
Total value of the contract/lot: £1,000,000,000
Section five. Award of contract
Lot No
3
Title
Lot 3 - Retrievals Silos
A contract/lot is awarded: Yes
five.2) Award of contract
five.2.1) Date of conclusion of the contract
30 October 2025
five.2.2) Information about tenders
Number of tenders received: 1
Number of tenders received from SMEs: 0
Number of tenders received from tenderers from other EU Member States: 0
Number of tenders received from tenderers from non-EU Member States: 0
Number of tenders received by electronic means: 1
The contract has been awarded to a group of economic operators: No
five.2.3) Name and address of the contractor
NDS (Altrad Support Services Ltd, Cavendish Nuclear Ltd, Shepley Engineers Ltd)
Units 6 & 7 Lyncastle Way Appleton Thorne Trading Estate Warrington
Warrington
WA4 4ST
Country
United Kingdom
NUTS code
- UKD61 - Warrington
National registration number
n/a
The contractor is an SME
No
five.2.4) Information on value of contract/lot (excluding VAT)
Initial estimated total value of the contract/lot: £1,000,000,000
Total value of the contract/lot: £1,000,000,000
five.2.5) Information about subcontracting
The contract is likely to be subcontracted
Value or proportion likely to be subcontracted to third parties
Proportion: 1 %
Section five. Award of contract
Lot No
4
Title
Lot 4 - Integrated Nuclear Waste
A contract/lot is awarded: Yes
five.2) Award of contract
five.2.1) Date of conclusion of the contract
30 October 2025
five.2.2) Information about tenders
Number of tenders received: 3
Number of tenders received from SMEs: 0
Number of tenders received from tenderers from other EU Member States: 0
Number of tenders received from tenderers from non-EU Member States: 0
Number of tenders received by electronic means: 3
The contract has been awarded to a group of economic operators: No
five.2.3) Name and address of the contractor
A2R (Altrad Support Services Limited and AtkinsRéalis UK Limited)
Rutherford House, Westlakes Science Park
Whitehaven
CA24 3JZ
Country
United Kingdom
NUTS code
- UKD11 - West Cumbria
National registration number
n/a
The contractor is an SME
No
five.2.4) Information on value of contract/lot (excluding VAT)
Initial estimated total value of the contract/lot: £600,000,000
Total value of the contract/lot: £1,600,000,000
Section six. Complementary information
six.4) Procedures for review
six.4.1) Review body
Royal Courts Of Justice
Strand
London
WC2A 2LL
Country
United Kingdom
Internet address
https://www.find-court-tribunal.service.gov.uk/courts/royal-courts-of-justice