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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 here 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 TPBN1_UKTJ