System Thermal-Hydraulics Analyst

Aalo Atomics; Austin (TX); On-site; USD 99,000 - 121,000; Full time

Benefits offered by this job

Paid Time Off

Competitive salary

Job summary

Aalo Atomics is seeking an experienced System Thermal‑Hydraulics Analyst to support advanced nuclear system analysis and safety evaluations. Based in Idaho Falls, you will develop, execute, and maintain RELAP5‑3D/TRACE models for normal operation, off‑normal events, and accident scenarios.

You will document results, contribute to licensing decisions, and collaborate with reactor designers and safety analysts to strengthen safety margins and support design choices.

Qualifications

• MSc in Nuclear Engineering or a closely related field is required.
• 5+ years of proven experience performing analyses with system thermal-hydraulic codes such as RELAP5/RELAP5‑3D and/or TRACE.
• Strong understanding of single and two‑phase flow, heat transfer, and nuclear reactor thermal‑hydraulics.
• Demonstrated ability to work independently on complex analysis tasks.

Responsibilities

• Develop, execute, and maintain system thermal‑hydraulic models using RELAP5‑3D code.
• Perform steady‑state and transient analyses for nuclear systems, including normal operation, off‑normal events, and accident scenarios.
• Interpret and document analytical results to support licensing, design decisions, and safety assessments.
• Collaborate with reactor designers, safety analysts, and experimental teams to support integrated system evaluations.
• Participate in code verification, validation, and benchmarking activities against experiments or operating data.
• Prepare high‑quality technical reports, analysis documentation, and presentations for internal and external stakeholders.

Skills

RELAP5-3D/TRACE experience

Thermal-hydraulics knowledge

Independent work capability

DOE/NRC experience

QA/model development practices

Mentoring junior analysts

Experimental thermal hydraulics

Education

MSc in Nuclear Engineering or closely related field

Job description

About this position

About Aalo Atomics

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.

About the role

We are seeking an experienced System Thermal‑Hydraulics Analyst to support advanced nuclear system analysis and safety evaluations. The successful candidate will perform detailed system‑level thermal‑hydraulic modeling and contribute to analysis supporting reactor design, safety margins, and transient/accident behavior.

What you’ll do

• Develop, execute, and maintain system thermal‑hydraulic models using RELAP5‑3D code.
• Perform steady‑state and transient analyses for nuclear systems, including normal operation, off‑normal events, and accident scenarios.
• Interpret and document analytical results to support licensing, design decisions, and safety assessments.
• Collaborate with reactor designers, safety analysts, and experimental teams to support integrated system evaluations.
• Participate in code verification, validation, and benchmarking activities against experiments or operating data.
• Prepare high‑quality technical reports, analysis documentation, and presentations for internal and external stakeholders.

Qualifications

Required:

• MSc in Nuclear Engineering or a closely related field.
• 5+ years of proven experience performing analyses with system thermal‑hydraulic codes such as RELAP5 / RELAP5‑3D, and/or TRACE.
• Strong understanding of single and two‑phase flow, heat transfer, and nuclear reactor thermal‑hydraulics.
• Demonstrated ability to work independently on complex analysis tasks.

Preferred Qualifications

• Experience supporting DOE, NRC, or national laboratory projects.
• Familiarity with model development best practices and QA requirements for safety‑related analysis.
• Experience mentoring junior analysts.
• Experience on experimental thermal hydraulics is a plus.

Requirements:

• Based in the United States
• Willing to work on‑site in Idaho Falls, Idaho

What We Offer:

• Competitive salary starting at $110,000
• Paid Time Off

Additional Information:

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.