Mechanical Engineer

About Assystem

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements.

Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

As a member of Assystem, you’ll be part of a team driving the low-carbon energy future. We’re ranked second globally in nuclear engineering, offering you the chance to work on world-class projects like Hinkley Point

C. Together, we’ll innovate and shape tomorrow’s energy solutions.

Working on a major nuclear power plant project, the Mechanical Valve Engineer will support the design review, acceptance, and construction delivery of safety-classified plant systems. The role forms part of the intelligent customer function on behalf of the project, ensuring valve-related design solutions meet nuclear safety, quality, and operational requirements.

The Valve Engineer acts as the technical authority for reviewing and accepting design modifications raised during construction and ensuring technical justification from the responsible designer and contractors. The role involves managing interfaces between construction contractors, designers, equipment suppliers, commissioning teams, and nuclear safety stakeholders.

Working within project’s multidisciplinary engineering environment, the successful candidate will provide specialist expertise across the lifecycle of valve operations, from design review through installation, testing, commissioning, and handover.

• Nuclear-classified valve design and specification.
• Safety, isolation, control, pressure relief, and check valves.
• Motor-operated valves (MOVs), pneumatic valves, hydraulic actuators, and manual valve assemblies.
• Valve sizing, selection, and performance assessment.
• Pressure boundary integrity and valve qualification.
• Piping systems and valve interfaces.
• Mechanical equipment and process system integration.
• Valve maintenance, operability, and reliability engineering.
• Manufacturing, assembly, testing, and inspection of valves.
• Welding and pressure equipment regulations.
• Valve-related Instrumentation & Control (I&C) interfaces.
• Commissioning and operational readiness of valve systems.

The Joint Design Office is a large multidisciplinary engineering organisation supporting the project. As a Valve Engineer, you will interface regularly with:

• Responsible Designers.
• Turnkey Contractors.
• Construction and Installation Teams.
• Quality and Inspection Teams.
• Safety Case Engineers.
• Commissioning Engineers.
• Regulatory and Independent Oversight Bodies.
• Equipment Manufacturers and Supply Chain Partners.

• Develop and maintain an understanding of valve systems within the EPR design and their contribution to nuclear, environmental, and conventional safety functions.
• Review and assess valve-related design changes, technical queries, concessions, and non-conformances.
• Provide technical oversight to ensure compliance with nuclear safety, environmental, quality, and regulatory requirements.
• Support acceptance of construction and installation activities relating to valve systems.
• Ensure valve design, manufacture, testing, and installation comply with applicable codes, standards, and project specifications.
• Work collaboratively with Responsible Designers, contractors, suppliers, and internal stakeholders to resolve technical issues.
• Support commissioning activities and ensure valve performance requirements are met.
• Interface with regulators and independent assessment bodies as required.
• Coordinate specialist support from external organisations and subject matter experts.
• Contribute to lessons learned, technical risk management, and continuous improvement activities.

Working on behalf of the nuclear licensee, the Valve Engineer will use technical expertise and professional…