Develop and refine neutronic and/or thermal‑hydraulic models of the reactor core
Deliver technical analysis across core physics, kinetics and thermal‑hydraulics disciplines
Assess steady‑state and transient core performance, ensuring compliance with safety limits
Support evaluation of core‑related fault sequences and plant behaviour under fault conditions
Develop and implement methodologies for core analysis and modelling
Establish verification, validation and uncertainty quantification requirements for analytical models
Produce high‑quality technical assessments supporting safety, environmental and economic performance
Deliver work packages in line with programme governance, including planning, risk management and reporting
Develop integrated task plans and manage risks, issues and opportunities
Monitor progress and report against technical and programme milestones
Engage with internal stakeholders, customers and regulators to resolve technical queries
Manage interfaces with other engineering functions across the SMR programme
Ensure compliance with nuclear safety, export control and regulatory requirements
Support and mentor junior engineers, providing technical guidance and coaching

Strong experience in reactor physics and/or thermal‑hydraulics analysis
Understanding of pressurised water reactor (PWR) design, plant behaviour and operating principles
Knowledge of nuclear safety case development, regulatory practices and E3S principles (including ALARP and BAT)
Experience with analysis tools for core physics, kinetics or sub‑channel analysis
Experience developing or using analysis tools such as CMS, VIPRE, CTF, S5 or similar (or equivalent transferable tools)
Experience in developing pre‑ and post‑processing tools, ideally using Python
Understanding of software development processes and quality assurance frameworks
Proven ability to deliver complex technical work packages to time, cost and quality
Strong planning and organisational skills, with ability to manage dependencies and priorities
Ability to identify and manage technical risks and drive resolution
Strong technical writing and communication skills, including engagement with stakeholders
Experience working collaboratively across multidisciplinary engineering teams
Ability to coach, mentor and support the development of junior engineers
A strong academic background with a Master’s degree in Nuclear Engineering, Physics or a closely related discipline
Typically 5+ years’ experience in reactor physics and/or thermal‑hydraulics analysis
Experience in analysis scripting or data processing tools (e.g. Python).

Bonus – Performance‑related target opportunity up to 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 ability to buy or sell up to 4 days
Private Medical Insurance – BUPA single cover
Life Assurance – 6× pensionable pay
Home Office Support – £250 one‑off payment for new starters

Senior Engineer – Core Design, Performance

Key skills