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Reactor Physicist

  • Mississauga, ON
  • Hybrid
  • Posted Sep 13, 2026
  • 1 position

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Employment type
Full-time
Experience level
Senior · 5+ years
Minimum education
Bachelor’s degree
Posting language
English
Working hours
40 hours per week

Job summary

Perform and supervise complex reactor physics calculations, including kinetics and Monte Carlo simulations, to support nuclear power plant design and operations. Develop and adapt FORTRAN-based methodologies and document technical analyses to meet project schedules and quality assurance standards.

Job details

Job Description Candu Energy Inc. is looking for a Reactor Physicist to be a part of our Reactor Core Physics Department supporting the design of new nuclear power plants and the operation and refurbishment of existing CANDU nuclear power plants. Your role: Perform and/or supervise the following calculations: Finite-reactor-core calculations, Kinetics calculations, Advanced-fuel-cycle calculations, Monte Carlo calculations. Prepare inputs, run reactor physics computer codes Develop, adapt and modify FORTRAN computer codes as required for specific applications (e.g., to implement new methods or perform new types of calculations) Develop methodologies and perform reactor physics analyses to support design and commercial activities Document analyses in technical notes and reports, and present results at meetings Estimate, monitor schedules and assign work to meet completion date, perform varied work assignments effectively and respond quickly to changing project needs Propose/develop approaches to be used on reactor physics tasks Develop analysis basis plans About you: A Relevant honours degree from a university of recognized standing in Physics or Nuclear Engineering or equivalent; A minimum of 5 years of relevant experience (experience obtained in advanced degree programs will be considered for applicability against this requirement) Experience with reactor physics codes such as WIMS, DRAGON, RFSP and/or MCNP Experience with DONJON and KENO codes is very desirable Must be conversant with computer environments; proficiency in both Linux and WINDOWS environments is a strong asset Proficiency in computer programming, especially FORTRAN, is very desirable Excellent oral and written communication skills are required Ability to work well under pressure and be flexible, i.e., must be able to perform varied work assignments effectively and respond quickly to changing project needs Strong problem solving skills are essential Ability to show initiative while working in a team environment Ability to work to budget and schedule Full commitment to working in a formal QA environment. Reward & benefits Explore the rewards and benefits that help you thrive – at every stage of your life and your career at AtkinsRéalis in Canada. Enjoy competitive compensation, employee recognition, and a brilliant range of flexible benefits you can tailor to your health, wellbeing, financial and lifestyle needs. Make the most diverse opportunities for training and professional development to grow your skills and expertise. And take advantage of our hybrid working culture and generous time-off policies to balance a fulfilling career with your personal life. Be rewarded. Find out more. About AtkinsRéalis We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people. Find out more. Additional information AtkinsRéalis cares about your privacy. AtkinsRéalis and other subsidiary or affiliated companies of AtkinsRéalis (referred to throughout as “AtkinsRéalis”) are committed to protecting your privacy. Please consult our Privacy Notice on our Careers site to know more about how we collect, use, and transfer your Personal Data. By submitting your personal information to AtkinsRéalis, you confirm that you have read and accept our Privacy Notice. Appropriate accommodation will be provided upon request throughout the recruitment and hiring process as required by Company policy and the Accessibility for Ontarians with Disabilities Act (AODA). Successful applicants will be notified about AtkinsRéalis’ accommodation policies at the time the employment offer is extended, and the information will be shared with new personnel during the onboarding process. Worker Type Employee Job Type Regular At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.

What you’ll do

Perform and supervise complex reactor physics calculations, including kinetics and Monte Carlo simulations, to support nuclear power plant design and operations. Develop and adapt FORTRAN-based methodologies and document technical analyses to meet project schedules and quality assurance standards.

Requirements

Requires a relevant honours degree in Physics or Nuclear Engineering and a minimum of 5 years of experience in reactor physics. Proficiency in reactor physics codes like WIMS, DRAGON, or MCNP and strong programming skills in FORTRAN are essential.

Benefits

• Competitive compensation • Employee recognition • Flexible benefits • Training and professional development • Hybrid working culture • Generous time-off policies

Listed skills

  • Problem solving · Preferred
  • Technical Reporting · Preferred
  • Project management · Preferred

Other relevant skills

Identified from the job description. Confirm important requirements above.

  • Reactor physics
  • Nuclear engineering
  • Finite-reactor-core calculations
  • Kinetics calculations
  • Monte Carlo calculations
  • FORTRAN
  • WIMS
  • DRAGON
  • RFSP
  • MCNP
  • DONJON
  • KENO
  • Technical reporting
  • Problem solving
  • Project management
  • QA environment
  • Energy Systems
  • Chemical Kinetics
  • Communication
  • Computer Programming
  • Linux
  • Fortran (Programming Language)
  • Nuclear Fuel Cycle
  • Problem Solving
  • Project Management
  • Monte Carlo N-Particle Transport Codes
  • Nuclear Engineering
  • Physics
  • Proactivity
  • Safety Assurance

Job areas

  • Engineering
  • Energy
  • Science & Research
  • Physicist
  • Physicists and Astronomers
  • Physicists

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