Play a significant part in the UK’s sustainable nuclear future

At Sellafield Ltd, we are harnessing our expertise; bringing together world-class skills and innovative technology to solve complex nuclear, infrastructure, and engineering challenges. By joining Sellafield Ltd, you join an amazing team of people, from all walks of life, where you can thrive in a connected, considerate culture of innovation, collaboration, and community; and play a significant part in the UK’s sustainable nuclear future.​

The challenges we face are amongst the most complex anywhere in the world. We are using advanced technologies to shape, create and advance the world’s nuclear decommissioning knowledge and capability. That’s why our work is driven by people with a passion for problem-solving and innovation.

About the role​:
Our Commissioning Start up Operability Team ensures that new or modified assets are rigorously tested, compliant, and ready to transition safely and efficiently into operational use. On a highly regulated nuclear site, robust commissioning is essential, your work will directly support safe operations, regulatory compliance, and long term asset performance.
Our commissioning activities span:
• Operational value streams.
• Site infrastructure and major projects.
• IT and security systems.
• Both new build and modification environments.

With such diversity, you’ll gain invaluable experience across a wide range of plants, systems, and project types.

Joining the team means continuous development through structured training pathways, skill building opportunities, and strong early career support. Whether you’re experienced in commissioning or eager to transition into a plant based role, this is an excellent opportunity to grow.

Who we’re looking for:

We welcome applications from individuals with backgrounds in:
• Operations
• Maintenance
• Technical Support
• Engineering (Mechanical, Electrical, Control & Instrumentation)

You may be an experienced professional or early in your career looking for progression. If you bring most of the following, we’d love to hear from you:

• Understanding of legal, regulatory, contractual and governance requirements linked to commissioning.
• Knowledge of commissioning deliverables: People, Plant, and Procedures.
• Experience with design processes, HAZOP, risk management, estimating, and knowledge management.
• Familiarity with commissioning arrangements aligned with Nuclear Site Licence Condition 21.
• Experience delivering engineering, manufacturing, process, or plant based tasks.
• Involvement in defining and implementing Operations & Maintenance arrangements.
• Ability to develop positive stakeholder relationships and communicate effectively.
• A passion for shaping the future operation of new plants and systems.
• Ability to work within a team or lead defined work packages.
• Experience mentoring or coaching others.
• Good document and report writing skills.
• Awareness of the Sellafield gated process.
• Ability to obtain DV (Developed Vetting) clearance.

Why us?

At Sellafield Ltd, we are committed to supporting our employees in fulfilling their potential. With having 100 years of work in front of us, we offer comprehensive training and development opportunities, enabling you to feel inspired in your role. Whatever area you join us in, you’ll find a genuinely exciting and rewarding career.

Making sure our employees feel supported is important to us. Therefore, to help you get the most out of life in and outside of work, we also offer a range of employee benefits:
• You will benefit from an annual bonus of up to 10% – 15% made up of company and personal performance.
• An attractive defined contribution pension scheme – the company will match up to 13.5% for a 7% employee contribution!
• 30 days annual leave + bank holidays. Plus, the ability to purchase an extra 2.5 days per year.
• The ability to carry over 10 days annual leave each financial year.
• Paid Sick Leave.
• Family Friendly Policies – Visit our Rewards & Benefits page to read more.
• Cycle to Work Scheme.
• Lifestyle Benefits sasra.co.uk • Learning & Development Opportunities https://careers.sellafieldsite.co.uk/work-with-us/learning-and-development/
• Reward & Recognition Policies.
• Welfare & Employee Assistance Programme.
• Free Aviva Health App & Annual Health Check.
• MyDiscounts – Employee Savings & Discounts.
• MyBenefits – A Charity Giving Scheme.
• Many, many more! Click this link to visit our Rewards & Benefits page: https://careers.sellafieldsite.co.uk/work-with-us/rewards-and-benefits/

Sellafield Ltd is a unique place to grow your career, offering a remarkable blend of role variety, job security, personal growth, professional development, and truly significant work. This is your opportunity to tackle some of the biggest challenges in the nuclear, infrastructural and engineering worlds and create a clean and safe environment for generations to come. Explore Sellafield Ltd today.

Additional Information:

• The closing date for this vacancy is 5th April 2026.
• In the event of a high number of responses to any advert, Sellafield Ltd reserves the right to close the advert early. Once closed, the advert will be removed from our website. We encourage you to submit your application as soon as possible to avoid disappointment.
• As part of the application process you will be asked to provide evidence of your qualifications. For this role we require English Language, Maths and Science GCSE or other equivalent qualifications may be considered.
• Please regularly check your Spam/Junk folders for news about this vacancy, correspondence could contain invitations to interview and other important updates.
• Sellafield Ltd are recognised as a Disability Confident Employer (Level 3). Disability Confident employers offer an interview to disabled applicants that meet the minimum criteria for a vacancy. Sellafield Ltd define the minimum criteria as the ‘essential skills’ which are listed on the vacancy notice. Whilst completing your application form, you will be able to indicate if you wish to be considered under the disability confident scheme. If you would prefer to discuss this directly with us, please contact the GBS Recruitment team on recruitment@sellafieldcloud.co.uk
• Please be aware that this role is subject to achieving security clearance. This role requires higher level of National Security Vetting where applicants must typically have 5 or 10 years of continuous residency in the UK. Factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict the level of clearance you’re able to achieve.