CRS6JP00014733, Job Posting Title: Principal Process Engineer in Warrington, Cheshire
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Job Title: Principal Process Engineer
Contract: 12-month contract (Inside IR35)
Location: Warrington (site-based / hybrid subject to project needs)
Security Clearance: UK Security Check (SC) - must be held or eligible
Positions Available: 3
Role Overview
We are seeking three highly experienced Principal Process Engineers to support a critical programme within the UK nuclear sector. These roles have been raised as a specific project requirement and will play a key part in the technical delivery, assurance, and development of process engineering solutions associated with RepU management and reuse.
The programme relates to the UK's historic and potential future use of reprocessed uranium, including its storage, conversion, re-enrichment, and potential reuse in fresh fuel cycles.
Key Responsibilities
Provide principal-level process engineering leadership to the project
Develop, review, and approve process flowsheets, mass and energy balances, and technical documentation
Support process design, optimisation, and safety case development for nuclear fuel cycle facilities
Interface with safety, operations, commissioning, and regulatory teams
Ensure compliance with UK nuclear regulations, safety standards, and best practice
Act as a technical authority, mentoring junior engineers where required
Support technical decision-making and risk reduction across the project lifecycle
Essential Experience & Skills
Chartered or chartership-track Process / Chemical Engineer (IChemE or equivalent)
Extensive experience in nuclear process engineering, ideally within fuel cycle, reprocessing, or waste programmes
Strong understanding of nuclear safety principles and regulated environments
Experience producing and reviewing technical substantiation and safety documentation
Ability to work effectively in multi-disciplinary project teams
SC clearance held or clear eligibility to obtain
Desirable
Direct experience with RepU, reprocessing, enrichment, conversion, or spent fuel programmes
Experience working on UK nuclear licensed sites (e.g. Sellafield or similar)
Knowledge of once-through and closed fuel cycle strategies
If you've got strong nuclear process engineering experience and active SC clearance, this is a chance to work on a technically complex, nationally significant project.
Please click to find out more about our Key Information Documents. Please note that the documents provided contain generic information. If we are successful in finding you an assignment, you will receive a Key Information Document which will be specific to the vendor set-up you have chosen and your placement.
To find out more about Progressive please visit
Progressive Recruitment, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC(phone number removed) England and Wales
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- Location:
- Warrington
- Job Type:
- FullTime
- Category:
- Principal Process Engineer, Engineer, Process Engineer, Engineering, Process