ph3Reactor Physics Neutronics Engineer — Micro Modular Reactor /h3 h3Pisa, Italy · Onsite · Permanent · *****,000 € + premio /h3 pDesign the core of a reactor that will actually get built /p pMost nuclear engineers spend a career optimising someone else's core.
This is a chance to define one from a blank sheet.
/p pOur client is a nuclear technology company developing ab Micro Modular Reactor /b — small enough to transport, simple enough to deploy where grid power doesn't reach, and designed to produce both clean electricity and bmedical and industrial radioisotopes /b.
/p pThey are currently taking the design through the bUS NRC licensing process /b, which means the neutronics work you do here doesn't sit in a report.
It goes into a licensing submittal, and then into hardware.
/p h3Why this role is different: /h3 ul libReal scope, real ownership.
/b A (team size) engineering team, not a 400-person division.
Your core design decisions reach the CTO the same week you make them.
/li libLicensing-grade work.
/b 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.
/li libTwo missions in one machine.
/b Carbon-free power and isotope production for cancer diagnostics and treatment.
/li /ul h3What you'll own /h3 pYou'll be the reactor physics authority on the MMR core — from first-principles modelling through to defending your numbers in front of a regulator.
/p ul libCore design optimisation /b — define and iterate the core configuration, working the trade space between reactivity, thermal limits, cycle length and manufacturability.
/li libNeutronics analysis /b — criticality and reactivity coefficients, burnup and depletion, cross-section generation, flux and power distributions.
/li libShielding dose /b — shielding design, dose rate calculations,



and validation of radiation barriers.
/li libFuel cycle /b — fuel management strategy and fuel cycle analysis for a first-of-a-kind core.
/li libLicensing support /b — produce the analyses and technical documentation that support the NRC submittal, and engage directly with regulators and reviewers.
/li libSafety analysis /b — support risk assessment and failure mode analysis on reactor components alongside the safety team.
/li libMethod tool development /b — improve the models, workflows and verification practices the team will rely on for the next decade.
/li /ul h3What you'll bring /h3 h3Essential /h3 ul liMSc in Nuclear Engineering, Reactor Physics, or a closely related field.
/li liStrong grounding in breactor physics /b — you can explain why a core behaves the way your model says it does.
/li liHands-on experience with at least one Monte Carlo or deterministic neutronics code: bSerpent, MCNP, SCALE, PARCS /b, or equivalent.
/li liWorking knowledge of nuclear safety principles and a regulatory framework (bNRC, IAEA, or a national equivalent /b).
/li liThe engineering judgement to know when a result is wrong before the reviewer tells you.
/li liClear written English — your documentation will be read by regulators.
/li /ul h3Nice to have (genuinely optional) /h3 ul liPhD in reactor physics, neutronics, or radiation transport.
/li liExperience contributing to a blicensing submittal /b or safety case.
/li liMicro-reactor, SMR, HTGR, molten salt or research-reactor experience.
/li liRadioisotope production experience.
/li liScripting for automation and coupling (Python).
/li libItalian /b — useful for working with (the Italian engineering team / partners), not required.
/li /ul pbDon't tick every box?
/b Apply anyway.
Deep strength in core design and neutronics matters far more to us than a complete checklist.
/p /p #J-*****-Ljbffr

📌 Nuclear Reactor Engineer (Pisa)
🏢 Danem People Group
📍 Pisa