Defence – Sustaining the UK’s Nuclear Deterrent

Amentum focuses on providing advanced engineering, design, project management and mission support to enhance our military readiness and national security.

We are working across all the key sites that enable the UK’s continuous-at-sea deterrent (CASD) program, including HMNB Clyde, home base for the Royal Navy’s operational submarines; HMNB Devonport, the largest naval base in Western Europe, BAE Systems Maritime in Barrow-in-Furness, where the Royal Navy’s submarines are built, at Rolls-Royce Nuclear in Derby, where submarine reactors are manufactured, and the Atomic Weapons Establishment in Berkshire, which is responsible for nuclear warhead design and manufacturing. Amentum employs more than 350 multi-disciplinary engineers and project delivery professionals supporting the submarines which deliver Operation Relentless, the longest-running military operation in the history of the Ministry of Defence.

Key Projects


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  • Naval Nuclear Propulsion

    Since 1969, with our heritage of UK firms, Amentum has supported Operation Relentless, more commonly known as the continuous-at-sea deterrent (CASD).  The longest ongoing operation ever delivered by the Ministry of Defence (MOD), the CASD mission ensures that there is always a Royal Navy submarine on patrol armed with nuclear ballistic missiles.  Operating a nuclear…

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  • Naval Engineering and Sustainment

    We are working across all the key sites that enable the UK’s continuous-at-sea deterrent (CASD) program, including HMNB Clyde, home base for the Royal Navy’s operational submarines; HMNB Devonport, the largest naval base in Western Europe, BAE Systems Maritime in Barrow-in-Furness, where the Royal Navy’s submarines are built, at Rolls-Royce Nuclear in Derby, where submarine…

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    Enriched Uranium Components Programme

    Amentum is the Delivery Partner on the Enriched Uranium Components Programme at the Aldermaston site. Amentum is the programme integration partner, managing and delivering the scope of multiple independent yet interconnected projects. This includes: Completion of the Material Handling Store. Repacking of Enriched Uranium in readiness for shipment. Shipment of the material to a new…

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