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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