Scope
Reference
C28065
Description
Sellafield Ltd plan to call for competition under Lot 8 of the new Crown Commercial Services RM6356 Construction Professional Services 2 (CPS2) Framework Agreement that is due to go live in April 2026. Sellafield Ltd. anticipates the call for competition commencing in April 2026.
Design support is a critical enabler to the Sellafield Ltd mission. Delivery of design engineering and safety case support services are essential to the Sellafield decommissioning mission covering new assets, asset care, retrievals, and remediation projects. It will support the intelligent customer function for the other delivery models and provide early-stage client support to conclude the most appropriate point to commence scope transfer (i.e. value transition point).
The contracts will deliver a design scope associated with the provision of Intelligent Customer (IC) oversight and niche nuclear design and safety case specialisms for the Sellafield Ltd Enterprise.
The scope established to support the Sellafield enterprise aligns to capability provision. At the primary level it aligns to:
• Client support – IC design support and independent capabilities, including early front-end design and studies support (pre-value transition point)
• Operational support – providing a design and safety case provision to operational nuclear facilities, often needed quickly and with integrated working and on plant access. Value is realised through responsiveness to plant scenarios, minimising equipment downtime and reducing the need for replacement systems with associated Capital Departmental Expenditure Limit(CDEL) expenditure.
• Safety case and specialist nuclear capability – supplements existing internal capabilities and focuses on enabling access to specialist skills that otherwise wouldn’t be sustainable as part of full lifecycle delivery models.
The competition will be managed as ten procurements based on scope aligned to different areas of the business. They will be undertaken in three tranches:
Tranche 1
1. Contract 1 – Design support to Plant-Facing Design Office (PFDO) civil, structural and architectural
2. Contract 2 - Design support to PFDO multi-discipline mechanical, electrical and instrumentation
3. Contract 3 - Design support to PFDO manufactured products
4. Contract 4 - Design support to PFDO process
Tranche 2
5. Contract 5 - Design support to Site project office client
6. Contract 6 - Design support to Remediation / legacy projects
7. Contract 7 - Design support to Retrievals client
8. Contract 8 - Design support to Studies and engineering capability
Tranche 3
9. Contract 9 - Design support to Infrastructure front-end enabling
10. Contract 10 - Design support to Safety case
Tenderers can bid for all contracts. If a supplier bids for all contracts, the intention is to restrict award to four (4) contracts, to enable a resilient supply chain. Suppliers who are approved on Lot 8 and wish to submit bids for five(5) or more contracts of this procurement, will be required to state a ‘Preferred Contracts’ in the event they are scored highest on both bids.
The proposed duration for contracts is four (4) years, with no opportunity to extend for a further.
Commercial tool
Establishes a framework
Total value (estimated)
- £300,000,000 excluding VAT
- £360,000,000 including VAT
Above the relevant threshold
Contract dates (estimated)
- 1 June 2026 to 31 May 2030
- 4 years
Main procurement category
Services
CPV classifications
- 79933000 - Design support services
Contract locations
- UKD11 - West Cumbria
- UKD61 - Warrington
Engagement
Engagement deadline
5 December 2025
Engagement process description
Following publication of this UK2 Preliminary Market Engagement (PME) Notice Sellafield Ltd will be undertaking PME to prepare effectively before calling for competition.
The purpose of this Request for Information (RFI) is to provide potential participants who have bid for Lot 8 of CPS2 (and the wider Supply Chain), with the opportunity to engage with Sellafield Ltd. to better understand what the market can offer which will allow Sellafield Ltd. to refine and shape our requirements for Design Support Provider services.
Sellafield Ltd. also want to gather feedback on the proposed timescales, contract restrictions, Call-Off term and approach for the commercial model.
Suppliers must register their interest to obtain further information and provide feedback about this opportunity via the Nuclear Decommissioning Authority and Sellafield Ltd E-procurement system, Atamis.
This can be found at the following address: https://atamis-2464.my.site.com/s/Welcome. Once you have registered on Atamis, you can access all documentation and submit feedback using the record reference C28065, Design Service Providers Engagement Vehicle.
Further information and UK1 notices can be found in the following records:
C25802 - Plant-Facing Design Office (PFDO) Civil, Structural and Architectural
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021371-2025]
C25855 - PFDO: Multi-discipline Mechanical, Electrical and Instrumentation
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/020851-2025]
C25788 - PFDO: Manufactured Products Organisation
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021141-2025]
C25789 - PFDO: Process
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021152-2025]
C25799 - Site Project Office Client
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021111-2025]
C25786 - Remediation / Legacy Projects
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/020813-2025]
C25857 - Retrievals Client
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/020858-2025]
C25787 - Studies and Engineering Capability
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021134-2025]
C25797 - Infrastructure - Front-end Enabling
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021356-2025]
C25804 - Safety Cases
UK1 Notice: [https://www.find-tender.service.gov.uk/Notice/021340-2025]
Participation
Particular suitability
Small and medium-sized enterprises (SME)
Submission
Publication date of tender notice (estimated)
1 April 2026
Contracting authority
Sellafield Limited
- Public Procurement Organisation Number: PWYP-8439-MZWY
Hinton House, Birchwood Park Avenue
Warrington
WA3 6GR
United Kingdom
Contact name: Mark Kowe
Email: dsp.engagement@sellafieldsites.com
Website: https://www.gov.uk/government/organisations/sellafield-ltd
Region: UKD61 - Warrington
Organisation type: Public authority - sub-central government