Commissioning Engineer (Mechanical & Fuel Route)

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive.

Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all.

We'll inspire and empower you to deliver your best work so you can evolve, grow and succeed - today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent.

In addition to the benefits you'd expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships.

Work-life balance and flexibility is a key focus area for us. We're happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.

About the opportunity

Energy, Engineering and Technical Services is one of our newest Business Units and has been formed with the vision to support positive change and help shape the future of Nuclear Power. Our embedded teams are delivering support to Hinkley Point C (New build power station in the South West), Sizewell C (located in the South East), helping develop technologies in SMR (Small modular Reactor) capability and working towards building Poland's first Energy Power station.

Working in both client facing and internal roles we are delivering major programme and project management capabilities throughout the project lifecycle. We are driving to deliver safe, high quality and to time solutions by thinking innovatively and working collaboratively.

Amentum are currently looking for a Commissioning Engineer (Mechanical & Fuel Route) which 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 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 develop a comprehensive set of commissioning documents that incorporate technical test programs and safety justifications, which will form an integral part of the HPC Commissioning Arrangements. Building strong collaborative relationships with designers, contractors, the HPC 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 will be:

• Be responsible for the full commissioning lifecycle of multiple Radioactive Waste Systems at HPC
• Accountable to a Commissioning Manager in the NNB HPC Project team
• Develop commissioning documentation relating to commissioning testing and system validation activities
• Contribute to design reviews to ensure layout of plant items and systems are in a manner that allows ease of commissioning
• Assist in the detailed planning of commissioning activities and take ownership of a commissioning test program
• Take part in the execution of site commissioning activities including supervision of contractor commissioning personnel to achieve successful and safe commissioning of HPC systems
• Provide information to assist the Commissioning Manager and Senior Commissioning Manager in meeting project-level objectives and milestones
• Analyse commissioning results and provide reports summarising the outcome of commissioning
• Ensure that the commissioning process adheres to nuclear, environmental, and industrial safety regulatory requirements, incorporating international best practices in safety and technical excellence

Qualifications & Skills, experience

• Degree-qualified ideally in related engineering discipline, HNC or equivalent essential
• Technical background in industrial, power generation or process engineering
• Knowledge of Mechanical Systems is essential; Nuclear Fuel Handling Equipment knowledge desirable
• Experience in commissioning, maintenance and/or operations of Nuclear Island systems

Our Culture

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration.

We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.

When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility please visit to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team.