Mechanical Engineers
Confirmed on the employer's own hiring board on Oct 10, 2026. First seen by Alion on Oct 9, 2026. Assystem scores B on the Alion truth index.
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.
The Role:
Reporting to the Turbine Island Senior Mechanical Engineer, you will be responsible for various Turbine Island design development activities. The Mechanical Engineer shall work closely with multi-disciplined teams and the supply chain to help deliver the Turbine Island design.
Key Responsibilities:
Acting as an Intelligent Customer, involved in checking supplier deliverables, including design against requirements.
Development and checking with support of Senior Engineers of Process Flow Diagrams, Piping and Instrumentation Diagrams, Layout Drawings, Component Sizing Calculations, Component and Equipment Datasheets and Specifications, and other concept or detailed design related documents
Development and checking with support of Senior Engineers of Optioneering Studies or Decision Record Files, Design Descriptions, Requirement Specifications, among other design development activities
Application of Systems Engineering, including development and review of Functional and Design Requirements
Integration of Turbine Island design into wider power plant
Interface with wider Turbine Island team and stakeholders
Attend Design Reviews and HAZID/HAZOP studies with multidisciplined teams
Participate in nuclear safety licensing, environmental planning /permitting, and other interface activities that are relevant to the Turbine Island scope
Ensure adherence to the company statutory H&S Policies and rules and compliance with the project and Quality Management System
Your Background:
- Previous experience, in the nuclear sector or other highly regulated industries such as thermal power generation or oil and gas and process sectors. Good experience and background in thermal power systems and equipment such as steam turbines, condensers, feedwater heaters, pumps, and piping systems.
- Preferably with good experience in similar roles with specific emphasis on FEED through to detailed design and EPC delivery.
- Development of procurement specifications and working with equipment suppliers.
- Strong technical background and broad experience in thermal power or similar projects.
- Excellent communication skills and ability to interact with internal and external stake holders.
- Ability to identify and manage critical interfaces on major projects.
- Good knowledge of UK Health and safety regulations, safety systems, HAZOP and engineering substantiation and technical standards.
- Appreciation and application of ASME, European and UK codes and standards.
- Systems Engineering experience or awareness desirable.
Personal Specification/Attributes:
- Results oriented, ability to work independently and proactively as part of a team, good organisation skills, ability to deal with confidential and sensitive nuclear information in a professional manner and in-line with export control obligations.
- Bachelor’s degree or Higher National Diploma in an engineering discipline.
- CEng in a relevant discipline or working towards Professional Registration.
- SC Clearance or capable of achieving it.
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.
NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.
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.