{"id":594476,"url":"https://alion.io/job/atkinsrealis-senior-reactor-physicist","title":"Senior Reactor Physicist","company":{"id":8926,"name":"AtkinsRéalis","domain":"atkinsrealis.com","url":"https://alion.io/company/atkinsrealis","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":84,"open_postings":427,"ghost_share":0.002,"stale_share":0.621,"repost_share":0.009,"time_to_fill_p50_days":42,"computed_at":"2026-10-28T05:59:10Z"}},"role":"Energy","role_family":"Energy","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Mississauga, Canada"],"countries":["CA"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":74000,"max_usd":131000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":15},"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Fortran","optional":false},{"name":"MCNP","optional":false},{"name":"C++","optional":true},{"name":"Linux","optional":true}],"status":"live","first_seen_at":"2026-09-10T15:06:26Z","employer_posted_date":"2026-04-27","last_verified_at":"2026-10-29T00:19:25Z","board_verified":true,"closed_at":null,"days_open":48,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":48},"description":"Job Description\nOverview\nWe 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.\nPlease note that this job posting is intended for you to express your interest in future opportunities within AtkinsRéalis.\nYour role\nPerform and/or supervise the following calculations: Finite-reactor-core calculations, Kinetics calculations, Advanced-fuel-cycle calculations, Monte Carlo calculations.\n\nPrepare inputs, run reactor physics computer codes\n\nDevelop, adapt and modify FORTRAN computer codes as required for specific applications (e.g., to implement new methods or perform new types of calculations)\n\nDevelop methodologies and perform reactor physics analyses to support design and commercial activities\n\nDocument analyses in technical notes and reports, and present results at meetings\n\nEstimate, monitor schedules and assign work to meet completion dates Perform varied work assignments effectively and respond quickly to changing project needs\n\nPropose/develop approaches to be used on reactor physics tasks\n\nDevelop analysis basis plans\n\nAbout you\nMasters degree (or equivalent) or higher from a university of recognized standing in Physics or Nuclear Engineering or equivalent;\n\nExperience of CANDU reactor physics\n\nA minimum of 8 years of relevant experience (experience obtained in advanced degree programs will be considered for applicability against this requirement)\n\nExperience with reactor physics codes such as WIMS, DRAGON, RFSP , DONJON and/or MCNP\n\nExperience with nuclear data library creation\n\nExperience with few energy group constants\n\nExperience of uncertainty assessment\n\nKnowledge of light water reactors, and small modular reactors is desirable\n\nMust be conversant with computer environments; proficiency in both Linux and WINDOWS environments is a strong asset\n\nProficiency in computer programming, especially FORTRAN, C++ are very desirable Excellent oral and written communication skills are required\n\nReward & benefits\nExplore the rewards and benefits that help you thrive - at every stage of your life and your career at AtkinsRéalis in Canada.\nEnjoy competitive compensation, employee recognition, and a brilliant range of flexible benefits you can tailor to your health, wellbeing, financial and lifestyle needs.\nMake the most of diverse opportunities for training and professional development to grow your skills and expertise.\nAnd take advantage of our hybrid working culture and generous time-off policies to balance a fulfilling career with your personal life.\nBe rewarded. Find out more.\nAbout AtkinsRéalis\nWe'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.\nFind out more.\nAdditional information\nAtkinsRéalis 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.\nBy submitting your personal information to AtkinsRéalis, you confirm that you have read and accept our Privacy Notice.\nAppropriate 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).\nSuccessful 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.\nWorker Type\nEmployeeJob Type\nRegularAt AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. 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