The Nuclear Renaissance is Here

Fromgigawatt‑scalereactors tonext‑generationsystems, the UK’s nuclear future depends on engineers who thrive on solving complex physical problems and delivering deep technical insight backed by robust analysis.

AtFrazer‑Nash, ourreactor and systems performancespecialists sit at the heart of our work in nuclear safety, design, and assuranceacross a range of clients,technologiesandtechnical disciplines We are seekingpeople withseveral years'experience offissionreactor andsystemsperformancemodellingto help shape critical decisions, support safety cases, and strengthen the next generation of nuclear capability.Whether yourexpertiselies withreactor physics,thermal hydraulics, fuelperformanceor any relatedfissionnucleardiscipline,you will find a place with us as we expand our teams in support ofclients from across the industry.

We are looking for people with experience inany ofthe followingdisciplines

• Reactor physics

• Thermal hydraulics

• Fuel performance

• Fault studies

• Shielding and radiological protection

• Or any otherfissionreactor or systems performance discipline

Your work will help to:

• Tacklesafety‑criticalengineering challenges

• Support confident regulatory and design decisions

• Strengthen the UK’s civil nuclear capability

• Deliverhigh‑quality, trusted consultancy advice to our clients

AboutFrazer‑Nashin Nuclear

Frazer‑Nashhas over three decades of experience supporting the UK nuclear sector. Our multidisciplinary teams work across civil nuclear operations,new‑buildprogrammes and decommissioning, helping our clients meet exacting technical and regulatory requirements.

Ourreactor and systems performancespecialists work closely withdesign andsafety 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 technicalexpertise, and have visible impact.

Why JoinFrazer‑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 aReactor and Systems Performance modeller, you will apply advanced analytical techniques and modelling tools to understand and explain complex behavioursin 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, whilecollaborating with supportive colleagues and mentoringand guiding less experienced engineers.

Variety of work

Our consultants typically work on multiple projects at once, ranging from short, focused studies tolong‑termprogramme support across the nuclear lifecycle.

Growing capability

You will contribute to winning work, client discussions, and the continued growth of ourreactor and systems performancecapability across existing and emerging nuclear programmes.

Key responsibilities include:

• Developing andmaintainingmodels of nuclear plant systems usingindustry‑standardcodes,

• Analysingplant performanceunder a wide range of operating scenariosto inform design decisions and nuclear safety cases,

• Providing authoritative interpretation of model results and underlying physical phenomena,

• Supporting model verification, validation, andbest‑practiceapplication,

• Communicating complex technical outputs clearly and concisely to clients, regulators, and internal stakeholders.

WhatWe’reLooking For

Technical experience:

• Demonstrable experience inthe application of your technical discipline within thefissionnuclear industry, supportingplant design and/or operations,

• A strong understanding oftheunderlying 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

• Theability and desire to apply your knowledge andexpertiseto adjacent disciplines – broadening yourportfolio of experience andsupporting our clients in a flexible manner.

• Strong communicationskills, 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 colleagueswithformal and informal mentoring andtraining