Senior Reactor Physicist
Confirmed on the employer's own hiring board on Oct 27, 2026. First seen by Alion on Sep 10, 2026. AtkinsRéalis scores A on the Alion truth index.
Job Description
Overview
We are seeking a Senior Reactor Physicist to be part of our team in the Fuel and Physics department supporting the design of new nuclear power plants and the operation, refurbishment, or waste management and decommissioning of existing CANDU nuclear power plants.The Senior Reactor Physicist will work under specialist staff to assist in the development of advanced codes and methods and to perform technical analysis using up-to-date reactor physics codes, such as WIMS, DRAGON, RFSP and MCNP.
Please note that this job posting is intended for you to express your interest in future opportunities within AtkinsRéalis.
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 dates 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
Masters degree (or equivalent) or higher from a university of recognized standing in Physics or Nuclear Engineering or equivalent;
Experience of CANDU reactor physics
A minimum of 8 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 , DONJON and/or MCNP
Experience with nuclear data library creation
Experience with few energy group constants
Experience of uncertainty assessment
Knowledge of light water reactors, and small modular reactors is desirable
Must be conversant with computer environments; proficiency in both Linux and WINDOWS environments is a strong asset
Proficiency in computer programming, especially FORTRAN, C++ are very desirable Excellent oral and written communication skills are required
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 of 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.
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.
Additional information
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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
EmployeeJob Type
RegularAt 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.