Great British Nuclear Awards Contract to Joint Venture
Amentum-Led Joint Venture Secures $406 Million Contract as Owner’s Engineer for UK’s First Small Modular Reactors
Great British Energy – Nuclear (GBE-N) has awarded a $406 million (£300 million) contract to a joint venture between Amentum (NYSE: AMTM) and Cavendish Nuclear to serve as the owner’s engineer for its flagship small modular reactor (SMR) project in the UK.
This long-term agreement, with a maximum duration of 14 years, will support the deployment of Rolls-Royce SMR’s innovative reactor technology at the Wylfa site in North Wales. The contract represents a significant milestone in advancing the UK’s clean energy ambitions and the rollout of its first SMRs.
The Amentum-led joint venture, known as Litmus Nuclear, will play a pivotal role in the SMR program by delivering independent assurance and expert technical guidance across critical areas, including design, safety, engineering, construction, and commissioning. This support is designed to help GBE-N achieve its goal of securing a final investment decision for the deployment of SMRs at the Wylfa site.
"This award recognizes Amentum’s expertise to accelerate the global expansion and revitalization of nuclear energy. It also underscores our central role in advancing the UK’s nuclear ambitions, complementing our ongoing work at Hinkley Point C and Sizewell C,” said Loren Jones, senior vice president and head of Amentum’s Energy & Environment-International business. “Amentum will draw upon our expertise in nuclear science and engineering to provide independent technical and delivery assurance, helping GBE-N advance the SMR program and bolster the UK’s energy security and industrial base.”
The joint venture will also ensure the SMR program meets regulatory requirements and is poised to deliver reliable, low-carbon power for decades to come.
In November 2025, the UK’s Department for Energy Security and Net Zero announced Wylfa, on the island of Anglesey/Ynys Môn, as the site for the country’s first SMR’s. These 470MWe reactors are smaller and designed to be built more quickly than some traditional nuclear power stations.
About Amentum
Amentum is a global leader in advanced engineering and innovative technology solutions, trusted by the United States and its allies to address their most significant and complex challenges in science, security and sustainability.
About Amentum in the United Kingdom
With more than 6,000 people in the UK, Amentum is the delivery partner for project and construction management services at Hinkley Point C; sole program and project management delivery partner at Sizewell C; and also supports the UK’s existing nuclear power stations under a Lifetime Enterprise Agreement with EDF. It is a major supplier of engineering design, safety case and project management at Sellafield and other UK nuclear decommissioning sites and operates the country’s largest private sector complex of nuclear laboratories and engineering test facilities in Warrington.
