Process Engineer

Assystem is an international company with one mission: accelerate the energy transition around the world. Every day, our 7,750 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their millions of neurons to tackle the task of the century: switching to low‑carbon energy. Drawing on more than 55 years of experience in highly regulated sectors, we provide engineering, project management, and digital services to optimise complex infrastructure projects throughout their lifecycle.

Exciting opportunity to work on the SMR Project – be a part of designing complex thermal and fluid systems for the innovative SMR project and contribute to a commercially groundbreaking new build.

• Analyze & calculate cooling water island systems with cutting‑edge analysis and calculation methods.
• Perform static and transient flow and thermal analyses using advanced software tools.
• Assist in designing and integrating various systems.
• Produce, review, and update system documentation.
• Define control strategies for system performance.
• Determine appropriate sizes for system components.
• Conduct thermal‑hydraulic calculations and modelling.
• Formulate detailed equipment specifications.

• Degree in Process or Chemical Engineering, or equivalent.
• Strong understanding of fluid mechanics, heat transfer, thermodynamics.
• Proven experience producing design documentation and test specifications.
• Proficiency with PIPESIM, Flomaster, or other 1D CFD software.
• Due to the nature of the work, applicants must meet UK security clearance criteria.

• Over 55 years in nuclear engineering.
• Ranked among the top 3 largest nuclear engineering companies.
• Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
• Ongoing training with numerous career opportunities.
• 70% of managers promoted internally.
• Hybrid work: 1‑2 days remote per week.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter!

Ready to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation!