Overview

AtkinsRéalis is looking to hire a Senior Mechanical/Process Engineer. This position requires experienced individuals who are self‑starters capable of working independently and leading or supervising junior engineers. The role involves working in a fast‑paced team setting to provide engineering services for Nuclear Power Plants within a matrix organization.

Your Role

- Prepare and review design basis documents for both nuclear and conventional systems of the nuclear power station (e.g., design specification, over‑pressure protection reports, design reports, drawings, BOMs, SCL, etc.).
- Prepare and review Engineering Change packages following the major nuclear operator’s ECC process.
- Mentor and provide technical guidance to junior engineers.
- Perform calculations and assessments as required.
- Support Engineering Management with timely updates on engineering progress, performance, and staffing needs.
- Directly interface with customer engineering representatives to ensure that applicable standards and regulatory requirements are met.

About You

- Degree in Mechanical or Chemical Engineering from an accredited university with a minimum of 15 years of relevant experience, including a minimum of 10 years in the nuclear industry as a Senior Design Engineer working on modifications to nuclear systems or components.
- Registered Professional Engineer in the Province of Ontario, in good standing.
- Qualified Specialized Professional Engineer to ASME Section III, Division 1, Appendix XXIII, or qualified for certification.
- Experience interfacing with CNSC and TSSA, including preparing correspondence letters, TSSA registration and reconcilation packages, code classifications, and memos.




- Experience in refurbishment, modifications, and technology enhancement of existing mechanical and piping systems, structures, and components (SSCs) in operating stations from concept design to available‑for‑service (AFS) and close‑out, following established client Engineering Change Control (ECC) processes and procedures.
- Experience in plant islanding/lay‑up engineering and mechanical, process, and piping systems integration/design and analysis for SSCs (e.g., turbine auxiliary systems, moisture separators/reheaters, water‑treatment plant, main condenser, HVAC, station drainage, cranes, compressed‑air systems, water systems, chillers, etc.).
- Working knowledge of nuclear codes and standards, including CSA N285.0, CSA N289, ASME Section III Division 1, and ASME B31.1.
- Working knowledge of the major nuclear operator’s ECC process.
- Results‑driven individual with strong interpersonal skills.
- Excellent written and oral communication skills.

Preferred Qualifications

- Knowledge of pressure‑boundary work, including pressure vessel design, analysis, code classification, code‑class boundary, non‑destructive examination, and design registration.
- Knowledge of ASME Y14.5 dimensioning and tolerancing standard.
- Knowledge of seismic and environmental qualification methods and processes.
- Presentation and public‑speaking skills.

Rewards & Benefits

Enjoy competitive compensation, employee recognition, and a range of flexible benefits that can be tailored to your health, wellbeing, financial, and lifestyle needs. Benefit from a hybrid working culture and generous time‑off policies to balance a fulfilling career with your personal life.

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📌 Specialist Engineer - Mechanical/Process (Mississauga)
🏢 AtkinsRéalis
📍 Mississauga