Nuclear engineering expertise

For decades, Actemium has been a trusted delivery partner to government organisations as well as Tier 2 and Tier 3 contractors across the UK nuclear sector – delivering safe, reliable and innovative mechanical, electrical and automation solutions.

The UK nuclear industry demands more than technical competence. It requires disciplined delivery, predictable performance, and an ability to operate safely and securely within highly regulated, mission‑critical environments.

Actemium brings together the expertise of specialist engineering businesses from across the UK to deliver integrated solutions spanning consultancy and design, manufacture and build, installation, testing, commissioning, and long‑term operational support. We cater to the full lifecycle – from early optioneering and Front-End Engineering Design (FEED) through to upgrades, obsolescence management and plant life extension – underpinned by robust project governance and a pragmatic, “right‑first‑time” approach.

Multi-discipline nuclear engineering

Across the nuclear enterprise, our teams are trusted for multi‑discipline engineering and safety‑critical systems delivery, including:

Mechanical, process, electrical and control & instrumentation engineering

Actemium provides integrated mechanical, process, electrical, and control & instrumentation (EC&I) engineering, covering concept development through to detailed design. This multi‑discipline capability ensures safe, compliant, and buildable solutions that translate complex requirements into engineered systems ready for delivery and operation.

Engineering substantiation and stress analysis

We deliver engineering substantiation and stress analysis that underpin nuclear safety cases and long‑term asset integrity obligations. Through robust analytical methods and disciplined design assurance, we verify that structures, systems, and components perform safely throughout their lifecycle and withstand scrutiny from regulators and stakeholders.

Industrial automation and software

We provide industrial automation and software solutions for the nuclear sector, including safety systems, control panel design and build, system implementation, commissioning, and ongoing lifecycle support. Our approach ensures reliable, secure, and compliant control architectures that perform predictably in safety‑critical and regulated environments.

Bespoke engineered products

Actemium designs, builds, and tests bespoke engineered products in the UK, including LV switchgear, motor control centres, process and control panels, generator control panels, and containerised e‑house or switch room solutions. This factory‑built approach improves quality, reduces onsite risk, and provides nuclear customers with proven, ready‑to‑deploy infrastructure aligned to programme and operational demands.

Digital engineering

Actemium applies digital engineering techniques such as laser scanning, virtual reality, simulation, and digital twinning to improve constructability and validate designs early. This approach reduces rework, de‑risks delivery, and strengthens operational readiness by giving project teams and operators greater confidence before build and commissioning.

Our expertise across the nuclear industry

Actemium supports a broad spectrum of nuclear sub‑sectors, including nuclear decommissioning, nuclear defence, nuclear fuel, nuclear research and development, and nuclear new build.

Nuclear Decommissioning

Actemium is an established nuclear decommissioning and waste retrieval solutions partner with a strong track record of executing complex projects safely, on time and to exacting quality standards. With over 40 years’ experience supporting customers including Sellafield and Magnox (now Nuclear Restoration Services), we have delivered work across some of the UK’s most nationally significant nuclear sites.

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Nuclear Defence

Actemium supports nuclear defence programmes with high‑integrity engineering delivered under rigorous security, assurance, and configuration control requirements. From containment and safety‑critical control systems to secure automation and resilient, factory‑tested power infrastructure, we help reduce delivery risk and provide engineering outputs that stand up to scrutiny – without losing pace.

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Nuclear Fuel

Actemium has a deep understanding of the nuclear fuel cycle, from uranium enrichment through to fuel fabrication, with decades of support at the UK’s enrichment facility at Capenhurst and fuel fabrication facilities at Springfields. Our work spans mechanical and powder handling, process engineering, specialist glovebox systems, and R&D programmes supporting the production of exotic nuclear fuels.

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Nuclear research and development

Actemium helps R&D and advanced nuclear programmes move quickly from concept to testable, repeatable systems without compromising safety, quality, or configuration control. Through pilot plants, high‑integrity containment, test infrastructure, and digital engineering tools, we translate research intent into buildable, operable systems with a clear route to commissioning and future scale‑up.

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Nuclear New Build

Actemium supports nuclear new build programmes with engineered electrical, automation, and containerised solutions that reduce site installation risk, improve quality control, and increase schedule certainty. Whether as a package contractor or specialist partner, we deliver programme‑ready systems with clear interfaces, disciplined governance, and fewer surprises at commissioning.

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Why choose Actemium?

40 years of proven successful delivery
across the UK the nuclear sector
300+ highly experienced & security cleared
nuclear engineers and project managers
Partnering with many Tier 1, 2 and 3 nuclear players
in the UK nuclear industry
On time and on budget
with a proven ability to deliver to exacting requirements

Award winning business
for innovation, quality and value
End-to-end capability
from design through to implementation and maintenance
Project management excellence
for seamless customer experience
Powered by global innovation
through Actemium and VINCI Energies

Want to know more?

Get in touch with our engineers today and we will help guide you with your project.

Our customers and partners

Over the years, Actemium has worked with some of the UK’s most respected nuclear operators, delivery partners and engineering organisations across civil, defence, R&D and decommissioning programmes.