Commissioning is the act of bringing something newly produced into a working condition.


Commissioning is the act of bringing something newly produced into a working condition; Or in the Sellafield context: is the process of demonstrating that all systems and components of a building or industrial plant are designed, installed, tested, operated, and maintained according to the operational requirements of the plant owner and within the safety constraints of the relevant regulatory body. Commissioning engineers are involved in all parts of the project process, as a key input into design, procurement and construction. During the Commissioning phase of the project our engineers will test systems and components of a constructed plant in accordance with procedures they author from design information and first engineering principles. Once the plant is tested and found to meet the design intent, the Commissioning Engineers will be involved in demonstrating readiness to start operations.

Typical roles and responsibilities:

Graduates will be assigned within several different project teams on a variety of nuclear projects during their two year graduate scheme period. The Commissioning Graduate will split their time between the office (writing test procedures and technical reports, planning work, analysing data, attending committees and inputting into various other project processes such as design and project support) and out on site/plant carrying out practical commissioning engineering tasks, such as executing tests, carrying out inspections and diagnosing and rectifying defects. These assignments will systematically enable professional and personal development whilst providing the engineering, technological, innovation and leadership challenges required to achieve Chartered status. Some of the Commissioning Graduates even achieve Incorporated Engineer status along the way to CEng and have gained this within the 2 year graduate trainee period.

Progression possibilities:

Development during the trainee period will enable the graduate to meet the future project challenges undertaking lead roles as technical expert engineers or technical and business managers. Post trainee period assignments within commissioning will provide continued development tailored to meet individual professional accreditation requirements. Graduate career pathways can vary and will be designed to progressively challenge the individual whilst they accrue experience as an engineer and as a leader within the company. All our graduates will accrue the right technical, project, business and leadership experience to achieve CEng within 4 years of joining the Sellafield Ltd.


Sellafield, West Cumbria

Suitable degree disciplines:

  • Electrical Engineering
  • Mechanical Engineering
  • Control Systems


The Technical Profession consists of 500 science, technology, engineering and maths specialists, who mainly have degrees in chemistry, physics, maths, materials science and chemical engineering disciplines.

Learn More


The commercial profession provides a service to the whole of Sellafield Ltd.

Learn More
Back to top