Nuclear Analysis Engineer

Aalo Atomics is pioneering a new era in clean energy with factory-fabricated microreactors designed to deliver affordable, scalable, and reliable nuclear power. Our mission is to make nuclear energy globally accessible, starting with the Aalo-1, a 10 MWe reactor leveraging cutting-edge safety, modularity, and efficiency. Based in Austin, TX, we’re rapidly growing as we work to deploy the world’s first fleet of advanced microreactors. Join us and help revolutionize energy for a sustainable future.

Aalo is seeking a Nuclear Analysis Engineer to support the design, analysis, licensing, testing, deployment, and operation of Aalo’s advanced reactor systems. Aalo is developing modular sodium-cooled reactor technology intended for scalable manufacturing and deployment. This role will contribute directly to reactor core design, safety analysis, and the technical basis needed to support design decisions, testing, and regulatory engagement.

Specific responsibilities may include:

• →Perform neutronics and reactor physics analyses in support of the design, evaluation, and optimization of advanced reactor cores.
• →Develop high-fidelity three-dimensional reactor models using Monte Carlo transport tools such as Serpent, MCNP, OpenMC, and SCALE.
• →Perform deterministic reactor physics calculations and develop reduced-order models, as appropriate, to support design iteration, scoping studies, and coupled analyses.
• →Evaluate core criticality, neutron flux and power distributions, power peaking, control rod worth, shutdown margin, excess reactivity, and other key nuclear design parameters.
• →Perform fuel depletion and fuel cycle analyses, including evaluation of fuel burnup, isotopic evolution, fission product poisoning, reactivity swing, activation, decay heat, and fuel management strategies.
• →Support multiphysics analysis by coupling neutronics models with thermal-hydraulics, fuel performance, and thermo-mechanical analysis tools.
• →Evaluate reactivity coefficients and feedback mechanisms, including fuel temperature (Doppler), moderator temperature, coolant temperature and density effects, voiding, and other temperature-dependent material effects.
• →Calculate reactor kinetics parameters, including delayed neutron fraction, neutron generation time, and related quantities needed for reactor dynamics and safety analysis.
• →Perform activation, radiation source term, and shielding analyses as needed to support reactor design, operations, maintenance, and safety evaluations.
• →Prepare clear, well-organized technical reports, presentations, and supporting documentation for design reviews, safety analyses, and licensing activities.
• →Communicate methods, assumptions, uncertainties, limitations, and design implications effectively to both technical and cross-functional stakeholders.

• →Competitive salary based on technical level
• →Health, Dental, and Vision Insurance
• →Paid Time Off
• →Corporate Gym Membership

Candidates only. No recruiters or agencies, please.

Candidates may contribute across several of the following technical areas:

• Monte Carlo neutron transport
• Deterministic neutron transport and diffusion methods
• Criticality analysis
• Fuel depletion and fuel cycle analysis
• Radioactive decay, activation, and source term characterization
• Sensitivity analysis and uncertainty quantification
• Multiphysics coupling
• Neutron instrumentation and detector response
• Verification and validation of neutronics analysis software

• Bachelor’s degree in Nuclear Engineering, Physics, Mechanical Engineering, or a closely related technical discipline
• 5+ years of experience performing reactor physics or neutronics analyses for nuclear reactor systems
• Strong grounding in neutron transport, reactor physics, criticality, and nuclear engineering fundamentals
• Experience with continuous-energy Monte Carlo methods and codes
• Experience with deterministic reactor physics methods or tools, including diffusion theory, discrete ordinates, nodal methods, or fast reactor analysis methods
• Proficiency in Python for engineering analysis, automation, scientific computing, or data processing
• Strong written and verbal communication skills

• Master’s degree or Ph.D. in Nuclear Engineering or a related field
• 10+ years of experience in reactor physics, core design, or nuclear analysis
• Experience with one or more production neutronics tools such as Serpent, MCNP, OpenMC, SCALE/KENO, Griffin, or DIF3D
• Experience with deterministic reactor physics tools or methods, including diffusion, discrete ordinates, nodal methods, or fast reactor analysis approaches
• Experience with advanced thermal-spectrum reactor design
• Experience designing or analyzing sodium-cooled reactor systems
• Experience using AI tools to improve the efficiency and effectiveness of engineering workflows
• Experience working under NQA-1-compliant software quality assurance programs and procedures, including software qualification and commercial-grade dedication
  
  

• Based in the United States
• Willing to work on-site in Austin, TX

We're building technology that will help reshape the future of energy. The pace is fast, the problems are difficult, and the expectations are high. Successful team members consistently demonstrate:

Aalo Atomics provides a collaborative and supportive work environment, opportunities for professional growth, intellectually challenging careers, and competitive compensation. Aalo Atomics is an equal opportunity employer and considers all employment decisions without regard to race, color, religion, national or ethnic origin, sex, sexual orientation, gender identity or expression, age, disability, veteran status, or any other characteristic protected by law.

Applicants must be U.S. Citizens or U.S. Persons in compliance with 10 CFR Part 810 and may not hold non-compliant foreign citizenships.

Direct applicants only. No recruiters or staffing agencies, please.