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Commissioning Engineer (Mechanical)

Please Note: The application deadline for this job has now passed.

Job Introduction

The role of Commissioning engineer is responsible for the safe delivery of project activities within an operational nuclear facility. Many of the projects are bespoke in nature and have complex nuclear safety aspects which must be demonstrated and documented to a high standard to comply with the arrangements laid out within the Nuclear site licence conditions.


The Bespoke nature of some of the projects to be delivered often required a novel engineering solution – it is expected that a commissioning engineer will contribute to the develop of these engineering solutions, while safety and quality is not compromised.

Role Responsibility

  • To carry out commissioning performance and safety testing and to document accurately testing results / performance data.
  • To mark-up engineering drawings / documentation to reflect the ‘as-built’ condition of installed and commissioned plan and equipment.
  • To document design, installation, quality performance, and safety non-conformances.
  • To provide commissioning progress reporting when required.
  • To supervise third parties when required.
  • Take part in internal and external audits when necessary.
  • To provide commissioning expertise into the design and safety case process (MDDR / HAZOP etc.).
  • Ensure Lifetime records are correctly documented and passed to document control for filing.
  • To look for opportunities/improvements to the operation of plant and/or equipment during the commissioning process.
  • To attend off site ‘works’ testing at manufacturers premises when required to carry out or witness testing of plant and equipment to be provided to site.
  • Display professional conduct at all times.

The above is not exhaustive and other duties may be allocated as required by the project and Commissioning Manager.

The Ideal Candidate

  • Time served indentured mechanical / Process Apprenticeship.
  • Minimum ONC or equivalent qualification in mechanical or Process Engineering.
  • Demonstrable engineering experience in the nuclear industry.
  • Demonstrable commissioning experience in the nuclear industry.
  • Experience in the production of performance test documentation.
  • Experience in the production of safety test documentation.
  • Be able to fault find on systems, plant and equipment.
  • A comprehensive understanding of safe working within a nuclear environment, including conventional hazards.
  • Ability to gain a Process Plant & Equipment (PP&E) nomination to carry out Plant Isolations for others.

About the Company

Grounded in robust science and decades of experience, National Nuclear Laboratory (NNL) is the authoritative voice in the UK and beyond for technological development within the nuclear power sector.

Our unparalleled understanding of the science, challenges and opportunities makes us an unrivalled authority and partner in the field, providing experts, technologies, and access to cutting-edge facilities to organisations around the world.

Harnessing potential technologies and translating them into to industry-ready solutions means our pioneering approach spearheads international improvement and technological progress.

We work on projects as small as drilling a hole to analyse underground wastes with our integrated micro drilling technology, or as large as developing state-of-the-art power systems for spacecraft, based on radioactive materials

NNL has a vision for Equality, Diversity and Inclusivity (ED&I) where NNL aims to be an inclusive workplace that attracts diverse talent through transparent and equal policies and procedures. We want you and the diverse mix of people that we employ, customers that we service and stakeholders that we influence to feel valued. We encourage a workplace culture where everyone can thrive with a sense of belonging.

National Nuclear Laboratory

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