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Assystem Strengthens Sellafield Partnership with New PACE Framework Win

· Issued by Assystem SA

Summary by 6ix AI

Sellafield Ltd, a United Kingdom nuclear site operator, has selected the OneAxIoM joint venture as preferred supplier for an asset care and asset creation program valued at up to $2.78 billion (£2.1 billion). Assystem, as a key supply chain partner, will support the work alongside the joint venture.

Key details

  • The work falls under the Projects and Asset Care Execution (PACE) framework contract. It will support Sellafield Ltd's spent fuel management and retrievals mission at its United Kingdom nuclear site.
  • Services cover engineering and design, procurement, installation and plant modification, project management and controls, commissioning, dismantling, removal and ongoing asset care.
  • OneAxIoM is led by Amentum and Mitie Plc. It combines the 16-year AXIOM Joint Venture of Assystem, Amentum and Mott MacDonald with the OneAIM Joint Venture of Amentum and Mitie Plc.
  • Assystem says its track record in engineering design and project management support, and its long-standing contribution to the Sellafield site's mission, were a key factor in its selection as a strategic supply chain partner to OneAxIoM.

What’s still pending

  • OneAxIoM has been selected as preferred supplier, and the program value is given as up to $2.78 billion (£2.1 billion), not a fixed amount.

6ix AI wrote this summary from the release below and checked it against the release.

On 6ix: 6ix.com/news/assystem-strengthens-sellafield-partnership-with-new-pace-framework-win

6 October 2026

United Kingdom nuclear site operator Sellafield Ltd has selected the OneAxIoM joint venture as preferred supplier for an asset care and asset creation program valued at up to $2.78 billion (£2.1 billion).

Under the Projects and Asset Care Execution (PACE) framework contract, the joint venture and Assystem, as a key supply chain partner, will support Sellafield Ltd's spent fuel management and retrievals mission by providing full lifecycle capabilities including engineering and design, procurement, installation and plant modification, project management and controls, commissioning, dismantling, removal and ongoing asset care.

OneAxIoM, led by Amentum and Mitie Plc, is the synergy of two Sellafield Ltd's most successful collaborations: the 16 year AXIOM Joint Venture comprising Assystem, Amentum, and Mott MacDonald, and the OneAIM Joint Venture, comprising Amentum and Mitie Plc.

Assystem's proven track record in delivering complex engineering design solutions and project management support and capability across one of the world's most challenging nuclear environments has established it as a trusted delivery partner. This expertise, coupled with its long-standing contribution to the Sellafield site's mission, was a key factor in Assystem being selected as a strategic supply chain partner to OneAxIoM, strengthening Assystem's delivery capability in support of Sellafield's long-term programme objectives.

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