Reactor and Systems Performance Consultant

Frazer-Nash Consultancy; Gloucester; Hybrid; GBP 50,000 - 65,000; Full time

Benefits offered by this job

25 days holiday

Private healthcare

Company pension

Flexible working

Job summary

The role offers hybrid working with time split between office, client sites and home, and a salary range of £50,000–£65,000 depending on experience.

Qualifications

• Demonstrable experience applying technical discipline within the nuclear industry, supporting plant design/operations.
• A degree in Engineering, Physics, Applied Mathematics, or related discipline, or equivalent experience.
• Ability to interpret, validate, and clearly explain complex modelling outputs.

Responsibilities

• Develop and maintain models of nuclear plant systems using industry-standard codes.
• Analyse plant performance under diverse operating scenarios to inform design decisions and safety cases.
• Provide authoritative interpretation of modelling results and underlying phenomena.

Skills

Strong communication skills

Education

Engineering, Physics, Applied Mathematics degree or related

Job description

Title Reactor and Systems Performance Consultant

Title Reactor and Systems Performance Consultant
Role: Reactor and Systems Performance Consultant
Salary range: £50,000–£65,000 per annum depending on experience
Location: Manchester, Burton, Bristol, Gloucester or Glasgow
Working Pattern: We operate a flexible hybrid working pattern at Frazer‑Nash, with time split between the office, client sites and working from home.
Closing date: 30th August. We encourage early applications, as vacancies may close once we receive sufficient applications.

The Nuclear Renaissance is Here

From gigawatt‑scale reactors to next‑generation systems, the UK’s nuclear future depends on engineers who thrive on solving complex physical problems and delivering deep technical insight backed by robust analysis.
At Frazer‑Nash, our reactor and systems performance specialists sit at the heart of our work in nuclear safety, design, and assurance across a range of clients, technologies and technical disciplines. We are seeking people with experience of reactor and systems performance modelling to help shape critical decisions, support safety cases, and strengthen the next generation of nuclear capability. Whether your expertise lies with reactor physics, thermal hydraulics, fuel performance or any related nuclear discipline, you will find a place with us as we expand our teams in support of clients from across the industry.
We are looking for people with experience in any of the following disciplines:

• Reactor physics
• Thermal hydraulics
• Fuel performance
• Fault studies
• Shielding and radiological protection
• Or any other reactor or systems performance discipline

Your Work Will Help To

• Tackle safety‑critical engineering challenges
• Support confident regulatory and design decisions
• Strengthen the UK’s civil nuclear capability
• Deliver high‑quality, trusted consultancy advice to our clients

About Frazer‑Nash In Nuclear

Frazer‑Nash has over three decades of experience supporting the UK nuclear sector. Our multidisciplinary teams work across civil nuclear operations, new‑build programmes and decommissioning, helping our clients meet exacting technical and regulatory requirements.
Our reactor and systems performance specialists work closely with design and safety engineers, providing insight into complex plant behaviour and supporting clients through design, justification, and regulatory engagement. We empower our consultants to take ownership of their work, build deep technical expertise, and have visible impact.

Why Join Frazer‑Nash?

• Work on nationally significant nuclear programmes with real societal impact
• Take ownership of technically challenging work and client delivery
• Develop your career in a supportive, technically ambitious consultancy
• Be part of a collaborative team shaping the future of nuclear engineering in the UK

Why this Role?

As a Reactor and Systems Performance modeller, you will apply advanced analytical techniques and modelling tools to understand and explain complex behaviours in nuclear systems. You will contribute across the full consultancy lifecycle, from technical analysis and interpretation through to client engagement and business development.
Taking the lead
You will manage technical work packages, engage directly with clients, and support project delivery, while collaborating with supportive colleagues and mentoring and guiding less experienced engineers.
Variety of work
Our consultants typical work on multiple projects at once, ranging from short, focused studies to long‑term programme support across the nuclear lifecycle.
Growing capability
You will contribute to winning work, client discussions, and the continued growth of our reactor and systems performance capability across existing and emerging nuclear programmes.

Key Responsibilities Include

• Developing and maintaining models of nuclear plant systems using industry‑standard codes,
• Analysing plant performance under a wide range of operating scenarios to inform design decisions and nuclear safety cases,
• Providing authoritative interpretation of model results and underlying physical phenomena,
• Supporting model verification, validation, and best‑practice application,
• Communicating complex technical outputs clearly and concisely to clients, regulators, and internal stakeholders.

Technical Experience

What We’re Looking For

• Demonstrable experience in the application of your technical discipline within the nuclear industry, supporting plant design and/or operations,
• A strong understanding of the underlying physics and engineering principals that underpin your technical discipline,
• A degree in Engineering, Physics, Applied Mathematics, or a related discipline, or equivalent relevant experience,
• Ability to interpret, validate, and clearly explain complex modelling outputs.

Personal And Consultancy Skills

• Ability to independently manage and deliver work to meet client requirements
• Experience contributing to proposal writing, client liaison, and business development
• The ability and desire to apply your knowledge and expertise to adjacent disciplines – broadening your portfolio of experience and supporting our clients in a flexible manner.
• Strong communication skills, with the ability to engage effectively through meetings, presentations, written reports, commercial bids, and technical discussions
• The ability to work as part of a broad team, including supporting colleagues with formal and informal mentoring and training

Due to the nature of the work that Frazer‑Nash Consultancy undertakes, candidates will be required to undergo pre‑employment screening and must be able to satisfy clearance criteria for UK National Security Vetting.

Benefits

We provide our people with an excellent benefit and offering package that comprises:

• Competitive salary with yearly reviews
• 25 days holiday + the opportunity to buy 5 days.
• A company that has its heart in the right place and a welcoming work culture.
• Happy to talk flexible working
• Enhanced parental benefits
• Company pension scheme
• Targeted professional development
• Life assurance
• Private healthcare membership
• Bonus scheme linked into company performance
• Paid membership fees to a professional institution
• Support in attaining professional membership
• Cycle to work scheme
• Season rail ticket loan
• And further optional benefits you can tailor to your personal requirements