Senior Neutronics Engineer

Working arrangements

Please note this role does offer hybrid working, our model sets out a minimum 60% onsite / 40% home working split

Part time working or job share options will be reviewed on an individual basis.

Fusion energy requires that a number of fascinating design challenges are met. One of these is nuclear technologies; focusing on shielding, tritium breeding, material assessments and activation. We are looking for a senior engineer to lead the technical focus in solving some of these challenges by applying sound physics and engineering judgement to develop solutions which meet the design requirements.

• Work within the Plant Prediction and Simulation department, playing a key role in the development of 3D radiation transport models of prototype fusion energy devices and other radiation sources
• Lead the neutronics effort to progress the design of power plant concepts, including radiation shielding, breeder blanket and bioshield technology, within an integrated project team
• Advance the maturity of shielding, breeder blanket and bioshield design solutions from initial conceptualisation through to detailed design
• Support subject matter experts in Radiation Measurement and Dosimetry
• Supervise the characterisation of the ionising radiation environment (including heat, biological and absorbed dose, and differential fluence) within and around fusion‑energy devices or other radiation sources
• Support the development of radiation transport/radiation effects tools to enhance the efficiency of design workflows
• Propose and perform validation and verification activities on radiation transport models
• Present technical information on the radiation environment, its effects, and the performance of shielding and breeder blankets to both expert and non‑expert audiences
• Interface and collaborate with a variety of in‑house and external resources

• Expertise in radiation transport code such as MCNP, OpenMC or GEANT4, with experience mentoring and guiding teams in advanced applications.
• Expertise in activation/transmutation codes, primarily FISPACT‑II, with knowledge of ORIGEN or similar tools and their strategic deployment in research and industry applications.
• Experience in or knowledge of nuclear fusion technology, including in tokamak design principles and contributions to high‑impact projects.
• Strategic knowledge of assurance techniques for radiation modelling results, with a proven ability to lead computational and experimental validation efforts.
• Good communication skills, capable of engaging with executive leadership, stakeholders, and external partners, while effectively supporting and guiding technical teams.
• Demonstrated technical leadership in solving complex problems through rigorous methodologies, fostering a culture of high‑quality planning, execution, and review.
• Advanced computational proficiency, ensuring optimal use of radiation transport software, including implementation of variance reduction techniques and streamlined analytical reporting through specialised software tools.
• Proactive leadership, driving projects to success under challenging objectives and compressed timelines, with an ability to set and refine strategic directions.
• Self‑driven and visionary approach, able to independently make decisions while also fostering collaboration across multidisciplinary teams.
• Experience in leading teams of scientists and engineers, with a track record of mentoring, developing talent, and driving collective success.

• 25 days holiday (plus bank holidays and 3 festive days to be used between Christmas and the New Year)
• Company pension scheme
• Eligible for company share option scheme
• Company bonus scheme, discretionary, dependant on performance
• A range of financial benefits including death in service and critical illness cover
• Cycle to work scheme

This job includes the following hazards or safety‑critical activities which will require successful pre‑employment health screening through our occupational health service before the successful candidate will be allowed to start work:

• Working at height (ladders, scissor lifts, cherry pickers &…