Why this role is different

- Real scope, real ownership. A [team size] engineering team, not a 400-person division. Your core design decisions reach the CTO the same week you make them.

- Licensing-grade work. Your analyses become part of a formal NRC submittal – the highest-rigour environment in the industry, and a credential that follows you for the rest of your career.

- Two missions in one machine. Carbon-free power and isotope production for cancer diagnostics and treatment.

What you'll own

You’ll be the reactor physics authority on the MMR core – from first-principles modelling through to defending your numbers in front of a regulator.

- Core design & optimisation – define and iterate the core configuration, working the trade space between reactivity, thermal limits, cycle length and manufacturability.

- Neutronics analysis – criticality and reactivity coefficients, burnup and depletion, cross-section generation, flux and power distributions.

- Shielding & dose – shielding design, dose rate calculations, and validation of radiation barriers.

- Fuel cycle – fuel management strategy and fuel cycle analysis for a first-of-a-kind core.

- Licensing support – produce the analyses and technical documentation that support the NRC submittal, and engage directly with regulators and reviewers.





- Safety analysis – support risk assessment and failure mode analysis on reactor components alongside the safety team.

- Method & tool development – improve the models, workflows and verification practices the team will rely on for the next decade.

Essential

- MSc in Nuclear Engineering, Reactor Physics, or a closely related field.

- Strong grounding in reactor physics – you can explain why a core behaves the way your model says it does.

- Hands-on experience with at least one Monte Carlo or deterministic neutronics code: Serpent, MCNP, SCALE, PARCS, or equivalent.

- Working knowledge of nuclear safety principles and a regulatory framework (NRC, IAEA, or a national equivalent).

- The engineering judgement to know when a result is wrong before the reviewer tells you.

- Clear written English – your documentation will be read by regulators.

Nice to have (genuinely optional)

- PhD in reactor physics, neutronics, or radiation transport.

- Experience contributing to a licensing submittal or safety case.

- Micro-reactor, SMR, HTGR, molten salt or research-reactor experience.

- Radioisotope production experience.

- Scripting for automation and coupling (Python).

- Italian— useful for working with [the Italian engineering team / partners], not required.

Don't tick every box?

Apply anyway. Deep strength in core design and neutronics matters far more to us than a complete checklist.

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📌 Reactor Physics & Neutronics Engineer (Pisa)
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