Senior Reactor System Design Engineer

You will join the Reactor Plant and Systems team, a multidisciplinary engineering function responsible for the design and development of the systems that underpin the Reactor Island. The team brings together expertise across mechanical, fluid and safety-critical systems, working collaboratively to develop robust, licensable and high-performing designs. Operating within a highly regulated environment, the team plays a critical role in progressing the programme through detailed design and regulatory approval., As a Senior Reactor System Design Engineer, you will lead the development of complex process and mechanical system designs across the Reactor Island. You will translate high-level requirements into robust, evidence-based design solutions that meet stringent regulatory and safety expectations, and contribute to the whole lifecycle of system design from concept to licensing support., * Lead the delivery of system design packages to ensure technical robustness, alignment with programme requirements and on-time delivery.

• Develop and manage system requirements, ensuring designs are clearly defined, traceable and supported by verification and evidence.
• Produce high-quality engineering documentation, including design reports, system definitions and substantiation artefacts supporting safety cases and regulatory submissions.
• Collaborate closely with internal teams and external stakeholders, including regulators, to resolve technical challenges and maintain programme momentum.
• Identify and manage risks and opportunities within the design scope, ensuring effective mitigation and continuous improvement.
• Apply design governance, configuration control and assurance processes to maintain consistency, quality and compliance.
• Provide technical leadership and guidance to engineers, supporting capability growth and driving a high-performance team environment.

• Proven experience delivering complex system design work within nuclear or another highly regulated or safety-critical industry.
• A degree in an engineering or relevant technical discipline, or equivalent industry experience.
• Strong understanding of systems engineering principles, including requirements management, integration and structured design approaches.
• Practical experience in mechanical or process system design, such as fluid systems, HVAC, chemical or plant-based systems.
• Confidence in producing and reviewing detailed technical documentation such as P&IDs, calculations and design substantiation reports.
• Strong communication skills with the ability to engage and build credibility across multidisciplinary teams and stakeholders.
• A collaborative and proactive approach, with the ability to lead technical work, solve problems and support the development of others.

• Salary range: £50,650 - £66,500 DOE (or £50,600 - £66,465 for UK currency).
• Performance-related bonus target opportunity: 12.5%
• Benefits Allowance: £2,200 per annum for a bespoke package.
• Pension: 12% employer and 6% employee contributions.
• Holidays: 28 days + public holidays, with the option to buy or sell up to 4 days.
• Private Medical Insurance - BUPA single cover health care.
• Life Assurance - 6x pensionable pay.
• One-off payment: £250 for new starters to purchase home office equipment.