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Our Vacancy

Mechanical Engineer

  • Nuclear
  • Permanent /
  • Warrington
  • 21/06/24
  • On site

Assystem is an international company with one mission: accelerate the energy transition around the world.

Every day, our 6,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy.

We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.

Drawing on more than 55 years’ experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering.

To ensure a viable, efficient, and reliable energy future for all.

Job Description

The Mechanical Engineer will support the design of complex thermal and fluid systems for the Fusion and Modular business unit. This exciting new build project is embracing innovation to deliver a commercially . The role will provide analysis and calculation support across all Cooling Water Island Systems and will contribute to an internal centre of excellence for analysis and calculation methodology. Along with the cross-cutting lead you will generate static and transient flow and thermal analyses using various software tools and methods to demonstrate the system performance.        

In addition the analysis engineer will assist with: 

  •        System design & system integration 

  •        Produce, review & update the system documentation 

  •        Performing analysis to define the control philosophy for the system 

  •        Perform sizing of components 

  •        Thermal-hydraulic calculation & modelling 

  •        Formulating equipment specifications 

My profile

Required Experience: 

Essential –  

  •        Process or Chemical Engineering degree or equivalent qualification 

  •        Demonstrated understanding of fluid mechanics, heat transfer & thermodynamics 

  •      Experience of producing design documentation and test specifications 

  •      Experience of PIPESIM, Flomaster or other 1D CFD software 

  • Experienced user of European and Offshore standards, for example Eurocode 3 and DNV.
  • Master level qualifications are preferable.
  • Experienced in the checking and approving of engineering CAD assemblies and detailed engineering/General Arrangement/fabrication drawings.
  • Experienced in the checking and approving of engineering documentation, such as manual calculations, reports etc.
  • Excellent Finite Element Analysis skills, in-depth knowledge of ANSYS workbench is desirable.
  • Experienced in the production checking and approval of non-linear and fatigue FEA using DNV and Eurocodes.

Additional Requirements:

  • Permanent Staff fill
  • BPSS and SC required
  • To undertake work packages supporting major UK and international Nuclear Clients.

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.


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 !. Bring your unique contributions and help us shape the future.

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