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

One of the key scope elements within MIP is establishing a defuel capability for out of service submarines. This work comprises of a number of interrelated projects to develop various multi-disciplinary infrastructure systems, with an overall value in excess of £100m. The Dock Readiness project is delivering the infrastructure upgrades for the existing dry dock that will be used for the submarine defuels. 

The primary purpose of the role is to ultimately assist and support the Design Manager in the delivery of project scope. This will include the likes of the following;

  • To undertake the delivery of mechanical engineering activities to the required scope, quality, schedule and cost.
  • Responsible for technical aspects of the mechanical engineering work packages from identification of the need, through to handover.
  • Undertake technical delivery of one or more design packages as directed by the Principal Mechanical Engineer.
  • Ensure that the design documentation covers the scope of operations required by the Project Manager and is produced to agreed standards, schedule and budget.
  • Plan for effective project implementation.
  • Ensuring effective Quality Management Arrangements, operate and deliver through compliance with Business Management System and Technical Manual.
  • Support ensuring that the processes and activities being undertaken are appropriately documented with appropriate records maintained and configuration and quality controls applied.
  • Support ensuring that staff and contractors are familiar with the hazards and risks associated with the work undertaken by the delegated engineering team through effective management and communication of the Risk Assessment.

My profile

  • Knowledge of design of mechanical and nuclear process systems e.g. fresh water, demineralised water etc.;
  • Knowledge of design of industrial gas systems e.g. low and high pressure air, welding gases etc.;
  • Knowledge of design of mechanical building services;
  • Awareness of seismic analysis for mechanical process equipment;
  • Awareness of substantiation of process equipment for justification of Nuclear Safety Functions.
  • Be able to demonstrate relevant knowledge and skills required in technical design development;
  • Sound understanding of engineering design and safety practice as relevant to discipline, post and project requirements;
  • Sound understanding of Company and departmental procedures relating to Design, Health & Safety and Quality requirements, and ability to manage tasks in accordance with these procedures;
  • Working knowledge of relevant engineering computer applications
  • The candidate will have a degree or equivalent in a Mechanical Engineering related discipline.

  • Preferably working towards Chartered Engineer status and member of relevant institute.

Security Clearance:

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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