Senior Process Engineer

Assystem, Warrington, England, United Kingdom

Assystem is a global leader committed to accelerating the energy transition. With 7,500 employees across 12 countries, we tackle the monumental task of switching to low‑carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top‑notch engineering, project management, and digital solutions.

Join the Fusion and Modular Nuclear Business Unit! The Process Engineer will support the design of complex thermal and fluid systems for the Rolls‑Royce SMR project. This exciting new build project is embracing innovation to deliver a commercially viable solution. The role will provide analysis and calculation support across Turbine Island systems and will contribute to an internal centre of excellence for analysis and calculation methodology.

You will generate static and transient flow and thermal analyses using various software tools and methods to demonstrate system performance.

• Ensure supplier deliverables meet requirements, challenging designs where necessary.
• Create and review Process Flow Diagrams, Piping & Instrumentation Diagrams, Layout Drawings, Component Sizing Calculations, and Specifications.
• Conduct and review studies and design documents.
• Develop and review functional and design requirements.
• Integrate Turbine Island design into the broader power plant.
• Serve as the go‑to expert for Turbine Island interface and stakeholder activities.
• Support Design Reviews, HAZID/HAZOP studies, and ensure adherence to H&S Policies.
• Work with safety teams on nuclear safety licensing and environmental permitting.

• 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 our managers are promoted internally.
• Hybrid work: 3 days remote per week.

• Background in the nuclear sector or regulated industries such as thermal power generation, oil and gas.
• Knowledge of steam turbines, condensers, feedwater heaters, pumps, and piping systems.
• Experience from FEED to detailed design and EPC delivery.
• Skilled in developing procurement specifications and working with suppliers.
• Excellent communication skills for interacting with internal and external stakeholders.
• Familiarity with UK Health & Safety regulations, safety systems, and HAZOP.
• Understanding of ASME, European, and UK standards.
• Experience or awareness of systems engineering desirable.

• Security: BPSS and SC required.
• Travel ready:
  Ability to travel to Assystem offices and customer sites within the UK.
• Global impact:
  Support major UK and international nuclear clients with key work packages.

Mid‑Senior level

Full‑time

Business Consulting and Services

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

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!