Mott MacDonald–Atomworks UK microreactors: siting and design notes for engineers
Reviewed by Joe Ashwell

First reported on New Civil Engineer
30 Second Briefing
Mott MacDonald has signed a memorandum of understanding with Cambridge Atomworks to accelerate development of a British-designed nuclear microreactor aimed at supplying low‑carbon power to remote, off‑grid sites. The collaboration will pair Atomworks’ reactor technology with Mott MacDonald’s nuclear engineering, licensing and infrastructure integration expertise, targeting applications such as isolated industrial facilities, defence sites and remote communities. For civil and geotechnical engineers, the move signals future demand for compact nuclear foundations, shielding structures, transportable modules and site layouts compatible with constrained, hard‑to‑access locations.
Technical Brief
- Road-moveable configuration implies axle-load, turning-radius and clearance constraints for haul roads and bridge crossings.
- Transportable reactor modules will drive demand for repeatable, standardised foundation and connection details across multiple sites.
- Off-grid siting suggests geotechnical design under limited site investigation data and challenging logistics for heavy plant.
- For civil contractors, microreactors foreshadow small-footprint nuclear civils packages rather than conventional large nuclear islands.
Our Take
In our infrastructure coverage, Mott MacDonald increasingly appears on nuclear‑adjacent work, from the £25M environmental and permitting contract for Great British Energy – Nuclear’s SMR deployment to this new microreactor MoU, signalling a deliberate move to own the advisory space around next‑generation nuclear in the UK.
Pairing microreactors with off‑grid UK sites plays to Mott MacDonald’s existing client base in water and local authority infrastructure (e.g. Yorkshire Water and Westmorland and Furness Council in recent pieces), which could make early pilots more about decarbonising public utilities than large centralised power schemes.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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