Lead nuclear HVAC design with heat-load calculations and multidisciplinary execution from AtkinsRéalis’ Mississauga head office in Ontario. This position includes potential project-site travel.
As a Senior HVAC and Mechanical Lead Engineer, you will oversee infrastructure projects from concept through contract administration. You will design HVAC and cooling systems, lead technical professionals, and support nuclear power plant engineering. The work includes equipment sizing, hydraulic modeling, P&IDs;, and regulatory submissions.
Key Responsibilities: Lead detailed HVAC and cooling-system design activities
Calculate heat loads, equipment sizes, flows, and pressure drops
Supervise, train, and mentor junior and intermediate staff
Prepare specifications, datasheets, drawings,



and vendor evaluations
Review designs, site changes, deficiencies, and commissioning support
Requirements: Accredited mechanical, chemical, or engineering-science degree
Canadian Qualified Engineer registration qualified to seal documents
Fifteen to twenty-plus years of progressive engineering experience
Experience with nuclear facilities or power plant design
Knowledge of CSA B51, ANSI B31.1, and ASME B31.3
Apply your nuclear HVAC leadership, equipment-sizing expertise, and engineering judgment to complex AtkinsRéalis infrastructure projects.

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📌 Senior Nuclear HVAC Lead Engineer (Ontario)
🏢 AtkinsRéalis
📍 Ontario