Senior Engineer - Core Design and Performance

• Develop and refine core physics and thermal-hydraulic models.
• Development, quality assurance and optimisation of core analysis methods.
• Deliver technical analysis across physics, kinetics, and/or thermal hydraulics.
• Produce assessments supporting E3S principles and plant economic performance.
• Establish verification, validation, and uncertainty quantification requirements.
• Provide technical supervision and informal coaching to junior analysts.

• Master's degree in Nuclear Engineering, Physics, or a closely related discipline.
• Experience in reactor physics and/or thermal hydraulics analysis.
• Proficiency in Python for pre/post-processing analysis scripts.

Technical Expertise

• Strong knowledge of reactor plant design and plant operations.
• Experience with physics and/or thermal hydraulics tools such as CASMO SIMULATE, S5, VIPRE, CTF and S5K.
• Familiarity with nuclear safety case development and regulatory practices.
• Understanding of software development processes and quality assurance.

Skills & Behaviours

• Proven ability to deliver complex technical tasks within agreed timescales.
• Strong planning, organisation, and risk management skills.
• Excellent technical writing and communication skills.
• Collaborative approach with experience mentoring junior team members., * Obtaining Baseline Personnel Security Standard (BPSS) clearance
• Satisfactory completion of a Disclosure and Barring Service (DBS) check
• Satisfactory completion of a basic financial probity check

We anticipate paying a salary of between £48,000 - £62,500 DOE plus:-

• Bonus - Performance related target opportunity 12.5%
• Benefits Allowance - £2,200 per annum, enabling you to create a bespoke package
• Pension - 12% employer and 6% employee contributions.
• Holidays - 28 days holiday (+ public holidays) and the ability to buy or sell up to 4 days.
• Private Medical Insurance - BUPA single cover health care
• Life Assurance - 6x pensionable pay
• £250 - One-off payment for new starters for home office purchases

Why Join Us?

You'll be joining a forward-thinking organisation that values transparency, fairness, and innovation. We offer:

• A flexible, inclusive, and supportive working environment.
• Opportunities for career growth in a rapidly scaling business.
• A culture that values diversity, innovation, and continuous learning.

As a Senior Engineer- Core Design and Performance at Rolls Royce SMR you'll play a key role in shaping the future of nuclear energy. You will develop and refine neutronic and thermal-hydraulic models, lead methodologies for core analysis, and deliver technical assessments that underpin safety, security, and economic performance. This is an opportunity to work on cutting-edge reactor technology, collaborating with experts to ensure our SMR reactor core meets stringent design and safety standards.