Commisioning Engineer - Mechanical & Fuel Route

# Commisioning Engineer – Mechanical & Fuel Route
* Nuclear* Permanent /
* Bridgwater* United Kingdom
* 05/06/26
* On site
* Share

I apply##️ 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.
Why Join the Community of Switchers?  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.##

Job Description
** Role Overview
** Working on a major nuclear power plant project, the Commissioning Engineer within the Mechanical & Fuel Route Team is responsible for the planning, execution, and delivery of commissioning activities associated with mechanical systems supporting the fuel route and reactor operations of the plant. The role ensures that systems are commissioned safely, compliantly, and in accordance with project schedules, regulatory requirements, and operational readiness objectives.

Working as part of a multidisciplinary commissioning team, the Commissioning Engineer will support the transition of systems from construction through testing, commissioning, and handover to operations, ensuring that all activities are conducted to the highest standards of nuclear safety and quality.
** Framework & Boundaries
** Throughout the project’s lifecycle, the role of the Senior Commissioning Engineer will evolve, combining  technical expertise with project management skills. At the early stages you will contribute to detailed  planning and preparation for the start of the Commissioning phase. Following this, you will oversee the  execution of factory tests and commissioning tests as part of a team and analyse of the results to justify the  readiness of the HPC units to safely enter commercial operation.

As part of the role, you will collaborate closely with Responsible Designers and project contract partners.  Together, you will ensure compliance with a comprehensive set of commissioning documents that  incorporate technical test programs and safety justifications, which will form an integral part of the  Commissioning Arrangements. Building strong collaborative relationships with designers, contractors, the  project delivery team, site engineering, and the plant operational organization will be crucial in  ensuring well-defined and controlled interfaces with the commissioning process.
** Key Responsibilities
*** Develop, review, and implement commissioning documentation, including:  + Commissioning Test Documents (CTDs)  + Commissioning Work Instructions (CWIs)  + Test Procedures  + Method Statements  + Risk Assessments
* Execute commissioning activities for mechanical systems associated with the fuel route, including:  + Fuel handling equipment  + Mechanical handling systems  + Cooling and auxiliary systems  + Ventilation and process systems  + Mechanical plant and equipment
* Coordinate and supervise commissioning technicians, contractors, and specialist vendors during testing and commissioning activities.
* Ensure all commissioning activities are conducted in compliance with:  + Nuclear site licence conditions  + Regulatory requirements  + Commissioning processes  + Safety, environmental, and quality standards
* Review construction completion records and verify system readiness for commissioning.
* Identify and manage commissioning defects, non-conformances, and punch list items through to closure.
* Support system walkdowns, inspections, and turnover activities between construction, commissioning, and operations teams.
* Participate in commissioning risk assessments and hazard identification workshops.
* Record, analyse, and report test results, ensuring…