Nuclear Thermal-Hydraulics Engineer

Nuclear Thermal Hydraulics Engineer Work Location: Waterloo, ON About Canadian Strategic Missions Corp. (CSMC) Canadian Strategic Missions Corporation is building the capabilities that will shape Canada's future in space, defence, and energy. We focus on developing dual use systems that address critical challenges here on Earth while enabling sustained human activity beyond it. In a short time, CSMC has established real momentum. WE have secured significant government investment to advance next generation micro nuclear reactors in partnership with leading institutions, alongside expanding a portfolio of technologies designed for remote environments, national defence, and future space missions. These efforts reflect a broader ambition to deliver reliable power and critical infrastructure where it matters most. Our work is grounded in close collaboration with government and guided by a clear sense of purpose: to build sovereign capability at a time when it has never been more important. We care deeply about execution, long term impact and earning the trust required to deliver systems that will service Canada and its allies for decades. CSMC is a company for builders. We are a group of people drawn to hard problems, meaningful impact and the opportunity to shape systems that matter at a national and global scale. We are building a team that thrives in ambiguity, values execution, and is motivated by mission and impact. About the Role We are seeking a Nuclear Thermal Hydraulics Engineer specializing in thermal-hydraulics to support the design and analysis of advanced reactor systems. The successful candidate will develop, implement, and validate models to assess heat transfer, fluid flow, and system performance under steady- state and transient conditions. Key Responsibilities Perform thermal-hydraulic and system-level analyses for reactor designs. Develop models using codes such as RELAP5, TRACE, OpenFOAM, COMSOL, or ANSYS Fluent. Analyze heat transfer, flow distribution, and two-phase flow phenomena. Support safety and performance assessments through coupled neutronic-thermal simulations. Evaluate coolant system design and decay heat removal capabilities. Prepare technical reports and present analysis results to project teams and stakeholders. Support the business development activities of the company including proposals, RFPs, regulatory applications, and other as needed. Qualifications Bachelor’s, Master’s, or Ph.D. in Nuclear Engineering, Mechanical Engineering, or related discipline. 2+ years of relevant experience in thermal-hydraulics analysis (industry, research, or graduate work). Demonstrated proficiency in one or more of the following: RELAP5, TRACE, OpenFOAM, ANSYS Fluent, COMSOL, or equivalent CFD/system codes. Strong understanding of heat transfer, single- and two-phase flow, and reactor cooling systems. Experience with Python, MATLAB, or similar scripting tools for post-processing and data automation. Excellent analytical and communication skills, including strong writing skills. Experience with CFD coupling, or multi-physics simulation. Exposure to experimental validation or test loop design. Prior experience with Aerospace or Military Grade engineering is a plus. Why Join CSMC CSMC is building technologies that will shape Canada’s future in energy, space, and national security. You’ll join a team of engineers, scientists, and mission‑driven builders who care deeply about solving hard problems that matter. We move quickly, support each other, and take pride in doing work that has real impact. Along the way, you’ll have access to competitive compensation, benefits, and equity, and the chance to grow with a company that values ownership, curiosity, and technical excellence. Employment Eligibility CSMC works with highly sensitive nuclear, defence, and aerospace technologies, and all roles require eligibility for federal security screening and compliance with controlled goods and export regulations. Candidates must be legally authorized to work in Canada, able to obtain and maintain Government of Canada security clearance, and eligible to meet foreign affiliation and export control requirements. These conditions are mandatory Bona Fide Occupational Requirements and reflect the need to securely develop and protect nationally significant capabilities.

Develop and validate thermal-hydraulic models to assess heat transfer and fluid flow for advanced micro-modular reactor systems. Perform system-level analyses and support safety assessments through coupled simulations and technical reporting.

Requires a degree in Nuclear or Mechanical Engineering with at least 2 years of experience in thermal-hydraulics and proficiency in CFD or system codes. Candidates must be eligible to work in Canada and capable of obtaining necessary security clearances.

• Equity Participation • Mentorship

Identified from the job description. Confirm important requirements above.

• Thermal-Hydraulics Analysis
• RELAP5
• TRACE
• OpenFOAM
• COMSOL
• ANSYS Fluent
• CFD
• Heat Transfer
• Two-Phase Flow
• Python
• MATLAB
• Multi-physics Simulation
• Reactor Cooling Systems
• Technical Reporting
• System-level Analysis
• Neutronic-thermal Simulations

• Engineering
• Energy
• Science & Research
• Technology
• Manufacturing

Minimum education

Bachelor’s degree

Minimum experience

2+ years

Posting language

English

Working hours

40 hours per week