Let’s find your next opportunity​

{{ job.job_posting_title }}
{{item.trim() }} {{item.trim() }} {{item.trim() }}
{{ job.job_posting_title }}

{{ job.is_cms_job ? (job.cities.split(';').length > 1 ? 'Various locations' : job.location_mappings[0]) : (job.location_mappings.length > 1 ? 'Various locations' : job.location_mappings[0]) }}

saved
viewed

Mississauga, Ontario, Canada

Overview


We are seeking a highly experienced Senior HVAC & Mechanical Lead Engineer (P.Eng.) to lead the mechanical design and multidisciplinary execution of complex infrastructure projects. In this role, you will oversee the complete lifecycle - from concept through contract administration - for HVAC for Nuclear Power Plants.

This position requires experienced individuals who are self-starters capable of working independently and leading/supervising junior engineers. The individuals will work in a fast-paced team environment performing engineering services for Nuclear Power Plants within a matrix organization.

Your role

  • Lead detailed design for HVAC and cooling systems. Supervise, train, and mentor junior and intermediate engineers, technologists.
  • Perform complex heat load calculations, equipment sizing (including high-capacity chillers, boilers, and pumps), piping /duct sizing, and hydraulic modeling, fluid flow analysis and pressure drop calculations.
  • Perform conceptual and detail design activities for HVAC and supporting systems which include preparation of ducting and instrumentation diagrams, detail drawings and equipment arrangement/layouts.
  • Support design registration submissions related to power plants (both conventional and/or nuclear), other commercial, etc.
  • HVAC equipment sizing and selection (AHU, FCUs, Stack etc.), prepares technical specifications, datasheets, engineering quotation request, technical tender evaluation and vendor document review.
  • Review design calculations, analysis reports, documents, and drawings in support of design verification.
  • Design specialized environmental systems for Class 1 Zone 1 & 2 hazardous locations.
  • Ensure full adherence to local, provincial, and national codes and standards including OBC, NFC, NFPA (including NFPA 820), ASHRAE, TEMA, API, and AODA. ASME (B31.1/B31.3, Section VIII) is an asset.
  • Interface directly with regulatory bodies (TSSA, MOE, Enbridge).
  • Define mechanical work scope, performing cost estimates, support proposal preparation, monitoring and reporting project progress and communicating with clients.
  • Collaborate with architectural, structural, electrical, and process control disciplines to integrate mechanical designs smoothly. Conduct technical, conceptual and detailed design meetings with peers, clients, and suppliers. Conduct site visits at site and suppliers.
  • Vendor development, technical evaluation for purchasing equipment, engineering estimates, budgets, schedules, and deliverables in accordance with Quality Management Systems.
  • Assist with proposal preparation, technical writing, and fee estimates to win competitive bids, respond to RFIs and evaluate vendor proposals. Prepare and review engineering quotation requests and technical evaluations. Review and approve supplier's capability to fabricate the required component within the applicable requirements.
  • Review field change notices, shop drawings, conduct site inspections, and resolve design deviations, and oversee deficiency resolutions and commissioning support.
  • Provide engineering support to quality surveillance, manufacturing, assembly and testing with non-conformances. Evaluate the completeness and status of delivered equipment.

Nuclear Engineering

Location

Mississauga, Ontario, Canada

Job Type

Full time

Ref

R-165839

Salary range

-

About you

  • Engineering degree from an accredited University in Mechanical Engineering, Chemical Engineering or Engineering Science.
  • Registered Professional Engineer in a Province of Canada, qualified to seal mechanical and chemical engineering documents.
  • A minimum of 15–20+ years of progressive experience in industrial plant, mechanical building services and infrastructure engineering. Strong knowledge of closed loop cooling water supply and chilled water supply systems is essential.
  • Experience for Nuclear Power plant will be an asset. Solid understanding of process systems, P&IDs, material selection and fundamentals of equipment design. Solid understanding and experience with equipment sizing, selection, and troubleshooting issues.
  • Experience working in or performing design work for systems within a nuclear facility licensed in Canada or outside Canada.
  • Working knowledge of/experience with the CSA B51 standard, ANSI B31.1, ASME B31.3 codes, and other power plants applicable standards or regulatory guides.
  • This is a leadership role; the successful candidate is expected to have demonstrable experience leading a team of technical professionals.
  • Strong written and oral communication skills are essential.
  • Willing to travel to and potentially work full or part-time at Project sites to meet corporate needs (Note: the initial site location is at the Mississauga head office in Ontario).

Additional, preferred qualifications:

  • Experience performing work according to nuclear power plants procedures, practices with the appropriate qualifications for nuclear power plants engineering activities is an asset.
  • Familiarity with HAP for load sizing and energy modelling. Familiarity with AFT Fathom (water flow/pipe sizing), AFT Arrow (duct sizing/pressure drop).
  • Knowledge of/experience using nuclear pressure boundary Codes and Standards, including CSA N285.0 and ASME Section III for reactor systems, code classification, code class boundary, and design registration is an asset.
  • Knowledge of seismic and environmental qualification methods and processes is an asset.
  • Presentation skills and public speaking abilities are an asset.

Why choose AtkinsRéalis?

Why choose AtkinsRéalis?

Wherever you are in your career – and whoever you are – AtkinsRéalis is for you. Here, support and collaboration are a vibrant part of a culture that lets you choose where – and how far – your career can go. Take on projects that push boundaries and drive sustainable impact, surrounded by colleagues who believe there's no limit to how brilliant you can be. It's time to join a like-minded team where you'll be rewarded, supported, and free to be your kind of brilliant.

Rewards & 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.

Be rewarded. Find out more.


Souvik: A nuclear leader and mentor dedicated to shaping a sustainable energy future

Discover Souvik’s video: a nuclear leader and mentor dedicated to shaping a sustainable energy future.

Souvik: A nuclear leader and mentor dedicated to shaping a sustainable energy future

About AtkinsRéalis

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.

Related jobs

Senior HVAC Engineer
Nuclear Engineering Full time
Senior HVAC Engineer

Mississauga, Ontario, Canada

Procurement Quality Assurance Representative (PQAR) / NDE Specialist
Nuclear Engineering Full time
Procurement Quality Assurance Representative (PQAR) / NDE Specialist

Mississauga, Ontario, Canada

Senior Safety Computer Engineer
Nuclear Engineering Full time
Senior Safety Computer Engineer

Mississauga, Ontario, Canada

Safety Computers Systems Engineer
Nuclear Engineering Full time
Safety Computers Systems Engineer

Mississauga, Ontario, Canada

Senior Mechanical Engineer
Nuclear Engineering Full time
Senior Mechanical Engineer

Mississauga, Ontario, Canada

Junior Instrumentation Control and Electrical Engineer
Nuclear Engineering Full time
Junior Instrumentation Control and Electrical Engineer

Mississauga, Ontario, Canada

Civil Engineering Assistant
Nuclear Engineering Full time
Civil Engineering Assistant

Pickering, Ontario, Canada

Civil/Structural Engineer
Nuclear Engineering Full time
Civil/Structural Engineer

Mississauga, Ontario, Canada

Specialist Engineer – Feeder Analysis
Nuclear Engineering Full time
Specialist Engineer – Feeder Analysis

Mississauga, Ontario, Canada

Senior Electrical Engineer - Balance of Plant
Nuclear Engineering Full time
Senior Electrical Engineer - Balance of Plant

Pickering, Ontario, Canada

Chemical Engineering Student - Winter 2027
Nuclear Engineering Full time
Chemical Engineering Student - Winter 2027

Mississauga, Ontario, Canada

Quality Engineering Student - Winter 2027
Nuclear Engineering Full time
Quality Engineering Student - Winter 2027

Mississauga, Ontario, Canada

Related blogs

When a detour becomes a calling: Frédérick’s journey in materials engineering

When a detour becomes a calling: Frédérick’s journey in materials engineering

Discover how Frédérick transitioned from aerospace engineering to materials quality control and now contributes to the success of major projects at AtkinsRéalis.

Card link for When a detour becomes a calling: Frédérick’s journey in materials engineering
Cybersecurity Careers: Bita's Journey

Cybersecurity Careers: Bita's Journey

For Bita, Cyber Security Specialist at AtkinsRéalis in Vancouver, the journey into cybersecurity wasn't a straight line. It spanned multiple countries, several technical disciplines, and more than a few moments of uncertainty. Today, she helps protect critical infrastructure projects combining technology, engineering, and problem-solving has led to a rewarding career protecting the infrastructure that powers modern life.

Card link for Cybersecurity Careers: Bita's Journey
Technician careers: a future-focused profession with endless opportunities

Technician careers: a future-focused profession with endless opportunities

At AtkinsRéalis, technicians are key members of our multidisciplinary teams and contribute to large-scale projects across Quebec, Canada, and around the world. From public transit and municipal infrastructure to energy, nuclear, and major industrial projects, their expertise helps deliver some of the country’s most complex and ambitious initiatives.

Card link for Technician careers: a future-focused profession with endless opportunities
Metallurgy and corrosion: Jean‑François

Metallurgy and corrosion: Jean‑François

Jean‑François is director of the metallurgy and corrosion group at AtkinsRéalis. With several decades of experience in materials science, welding inspection, corrosion, and quality control, he helps ensure the safety, durability, and reliability of critical infrastructure across Canada.

Card link for Metallurgy and corrosion: Jean‑François
Ragavendran in Blue shirt

Building more than projects: Ragavendran’s journey of growth

Some projects test your technical skills. Others change how you see your career. For Ragavendran, both happened along the way.

Card link for Building more than projects: Ragavendran’s journey of growth
Alexandre, mechanical engineer at AtkinsRéalis: leading industrial lifting projects in Saguenay

Alexandre, mechanical engineer at AtkinsRéalis: leading industrial lifting projects in Saguenay

When I chose to join AtkinsRéalis in Canada, I wanted to explore a new side of engineering. After working for contractors and equipment manufacturers as an estimator, project manager, and design engineer, this was my first experience with an engineering consulting firm. Today, I can confidently say that this decision has allowed me to broaden my skills while contributing to major industrial projects across the Saguenay-Lac-Saint-Jean region of Quebec.

Card link for Alexandre, mechanical engineer at AtkinsRéalis: leading industrial lifting projects in Saguenay
Praveen smiling in front of camera

Beyond the design: Praveen’s journey from delivery to ownership at AtkinsRéalis

Praveen has grown by taking on new challenges, broadening his perspective, and turning experience into greater ownership.

Card link for Beyond the design: Praveen’s journey from delivery to ownership at AtkinsRéalis
Lekhana in floral dress

Designing with purpose, leading with confidence: Lekhana’s journey at AtkinsRéalis

From solving complex engineering challenges to leading teams, Lekhana’s journey shows how the right opportunities can transform not just what you do, but who you become.

Card link for Designing with purpose, leading with confidence: Lekhana’s journey at AtkinsRéalis
Devendra on his bike

Creating impact through engineering excellence

What keeps an engineer inspired after nearly a decade in the industry? Devendra shares his journey.

Card link for Creating impact through engineering excellence
From engineer to project leader: Serafina on aviation, mentorship, and growth in Florida

From engineer to project leader: Serafina on aviation, mentorship, and growth in Florida

Meet Serafina from our Tampa office, where she's helping airports grow and communities thrive.

Card link for From engineer to project leader: Serafina on aviation, mentorship, and growth in Florida
Selfie of Mike and his partner standing in a golf course

Mike on mega projects, reinvention, and aviation at Denver International

From mega projects to airport expansion, read how AtkinsRéalis helped Mike grow beyond project delivery.

Card link for Mike on mega projects, reinvention, and aviation at Denver International
Growing through challenges: Vincent’s journey at AtkinsRéalis

Growing through challenges: Vincent’s journey at AtkinsRéalis

Today, I hold a hybrid role at AtkinsRéalis that combines business development, project management, and technical project delivery. My career path reflects the opportunities I chose to embrace, driven by a constant desire to learn and take on new professional challenges.

Card link for Growing through challenges: Vincent’s journey at AtkinsRéalis