Posted 12 months ago
Senior Reactor Physicist
@ Candu Energy Inc.
Mississauga, Ontario
Overview
AtkinsRéalis is hiring a Senior Reactor Physicist in Mississauga, ON, to support CANDU reactor design and operation. The role involves reactor physics calculations and analyses using codes such as WIMS, DRAGON and RFSP, plus code development and technical reporting. The posting offers competitive pay, flexible benefits and a defined contribution pension plan, and requires a master's degree or higher and at least 5 years of relevant experience.
Responsibilities:
- Perform and supervise finite-core, kinetics, fuel-cycle and Monte Carlo calculations
- Develop and modify FORTRAN codes for reactor physics applications
- Prepare inputs and run reactor physics codes
- Write technical notes and reports and present results
- Estimate schedules and assign work to meet deadlines
Requirements summary:
- Master's degree or higher in physics or nuclear engineering
- Minimum 5 years of relevant experience
- Experience with CANDU reactor physics
- Experience with WIMS, DRAGON, RFSP, DONJON or MCNP
- Proficiency in Linux and Windows; FORTRAN and C++ desirable
- Work within a formal QA environment
Tools & skills
Benefits mentioned
Source and dates
Employer career site / ATS feed · workday
- Employer posting date
- 2025-11-03
- First seen by our source
- 2026-10-08
- Source record updated
- 2026-10-16
These dates describe the source record, not a live verification that the employer is still hiring. Check the original posting.
Job details
| Seniority | Senior |
| Department | Engineering |
| Experience | 5+ years |
| Hours per week | 40 (estimated) |
| Work setting | Office |
| Position | Mostly sitting |
| Physical demands | physical low · computer high |
| Languages | English |
| Education | Master’s degree (required) |
| Fields of study | Physics, Nuclear Engineering |
| Perks mentioned | Flexible hours, Retirement plan, Stock or equity |
Summary and details written by AI from the posting; the employer’s posting is the authority.
Candu Energy Inc.
| Field | Value |
|---|---|
| Open jobs on Jobsy | 227 |
Job Description
Are you looking for a company that works on major engineering projects all over the world? Do you want to make a difference by improving the daily lives of communities worldwide? Are you seeking to join an inclusive and diverse team that you can truly count on? You’ve come to the right place!
Come join us in reshaping the future with AtkinsRéalis. AtkinsRéalis is dedicated in engineering a better future for our planet and its people.
Our Reactor Core Physics Department at AtkinsRéalis/ Candu Energy is engaged in design and analysis work to support the design of new CANDU Nuclear Power Plants as well as supporting the operation and safety of the existing domestic and international CANDU 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.
Location – Mississauga, ON
Your role within the team:
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 and document analyses in technical notes and reports, 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 as well as develop analysis basis plans
Why choose AtkinsRéalis as an employer?
Because we offer:
The opportunity to work on various major projects for internal and external clients.
An exciting environment where work-life balance is important.
A wide array of learning and development opportunities.
Competitive pay, flexible benefits, an employee share plan, and a defined contribution pension plan.
A work environment focused on health and safety.
The ideal candidate:
Masters degree or higher from a university of recognized standing in Physics or Nuclear Engineering or equivalent;
Experience with CANDU reactor physics
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 , DONJON and/or MCNP
Experience with nuclear data library creation
Experience with few energy group constants and uncertainty assessment
Proficiency in both Linux and WINDOWS environments is a strong asset as well as computer programming, especially FORTRAN, C++ are 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 work to budget and schedule and a full commitment to working in a formal QA environment.
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.
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