Are you a skilled tradesperson with experience in plumbing and steamfitting who takes pride in maintaining critical infrastructure safely and efficiently? If you are, we are looking for a Mechanical Maintainer / Plumber / Steamfitter to join our team at our Chalk River Laboratories site. In this role, you will support operations, research, and decommissioning activities by performing installation, maintenance, troubleshooting, commissioning, and repair work on piping systems and associated mechanical equipment.

Interested? If you answered yes, then this may be the job for you!

What you will be doing!

- Performing preventive maintenance and corrective maintenance activities on piping systems and associated mechanical equipment.
- Commissioning piping systems and equipment to support site infrastructure and operational requirements.
- Constructing, fabricating, installing, and modifying piping systems and associated mechanical equipment.
- Decommissioning piping systems and equipment, including safely removing piping, equipment, and related hazards.
- Reading and interpreting drawings, work packages, blueprints, and technical documentation to ensure work is completed accurately and in compliance with applicable requirements.
- Following maintenance records, route sheets, and quality control processes, including completing required documentation and sign-offs.
- Maintaining tools, equipment, and work areas while ensuring excellent housekeeping practices.
- Adhering to CNL, federal, provincial, and industry safety requirements and applying Event Free Tools practices throughout all assigned work.
- Troubleshooting mechanical systems and equipment to support safe and reliable operations.
- Assisting in training, coaching, and mentoring apprentices, trainees, and new employees by demonstrating safe work practices and technical skills.
- Collaborating with supervisors, planners, schedulers, facility staff, customers, and other trades personnel to coordinate work activities effectively.
- Other duties as assigned by your manager.

What We Are Looking For

- Education
- Secondary school diploma.
- Qualification as a Plumber/Steamfitter, typically acquired through completion of a 9,000-hour apprenticeship program or equivalent.

- Experience

- Experience using standard hand tools, power tools, calibration equipment, and shop machinery safely and effectively.

- Knowledge, Skills & Abilities





- Knowledge of applicable codes, standards, and safe work practices related to plumbing, steamfitting, and mechanical maintenance.
- Demonstrated commitment to the proper use of personal protective equipment (PPE).
- Solid written and verbal communication skills.
- Ability to work effectively in a multi-trade environment.
- Ability to read and interpret blueprints, technical drawings, specifications, and parts lists.
- Strong troubleshooting and problem-solving abilities.
- Physical fitness and the ability to perform the demands of a skilled trades position.

- Security Clearance Eligibility Required

- Reliability Status with Site Access Security Clearance (SASC), which has a minimum requirement of 3-5 years of verifiable history in Canada, Australia, New Zealand, the United States and/or the United Kingdom. CNL implements security screening in accordance with the Treasury Board of Canada Secretariat's “Standard on Security Screening” and the “Policy on Government Security.”

Working Conditions

- Working schedule: Four (4) days per week, ten (10) hours per day for a forty (40) hour work week.
- This position is part of th e M&E; Union a nd is governed by the terms and conditions outlined in the M&E; Collective Agreement. As a member of this bargaining unit, you’ll benefit from clear expectations around hours of work, wages, vacation, and other conditions that support a fair and consistent working environment.

Why CNL? Does the idea of working with a dynamic team across Canada to advance nuclear science and technology for a clean and secure world excite you? At CNL, we’re reinventing ourselves to be industry leaders—pioneering solutions to the problems that matter most. From building the next generation of clean nuclear and hydrogen energy technologies, to developing targeted cancer treatments, to continuing our global leadership in environmental remediation—we are driven by impact, innovation, and purpose.

What We Offer: A Total Rewards Package





We believe in taking care of our people. Here’s what you can expect as part of our team:

- Paid time off: vacation, sick, personal, and floater days
- Benefits effective Day One – no waiting period
- Tuition support to help you keep learning and growing
- A defined-benefit pension plan or a defined-contribution pension plan, depending on your employee group, to support your long‑term financial security

Do Our Priorities Resonate with You?

- Delivering clean energy for today and tomorrow
- Restoring and protecting the environment
- Contributing to the health of Canadians

If so, you’ll feel right at home at CNL!

Location: Onsite Located in the heart of the Ottawa Valley, our Chalk River site offers a beautiful natural setting with forests, lakes, and wildlife, right at your doorstep. Surrounded by welcoming communities such as Deep River, Petawawa, and Pembroke, you’ll have access to unparalleled outdoor adventures and a fantastic work-life balance. Please note: This is a fully on-site position based at our Chalk River Laboratory in Ontario.

Our Commitment to Equity, Diversity & Inclusion

At CNL, we are committed to fostering an environment that promotes equity, diversity, and inclusion. We celebrate and welcome employees, stakeholders, and partners of all backgrounds and identities. Click here to read all about it!

We are proud to uphold a workplace culture grounded in our Core Values:

- Respect
- Teamwork
- Accountability
- Safety
- Integrity
- Excellence

These values drive our employment practices and ensure meaningful career development opportunities and accommodations for all employees. CNL is an equal opportunity employer. If you require accommodation during any phase of the hiring process, please let us know via [email protected] . All requests will be handled with confidentiality.

CNL operates on sites located on the traditional lands, waterways and ceded and unceded territories of Indigenous peoples. CNL recognizes and affirms all First Nations, Métis communities and Inuit in this land we now know as Canada. We acknowledge, respect and seek to better understand Indigenous history, rights and title on the lands where we work and develop projects. We honour and respect the importance of the relationship between Indigenous peoples and their lands, waters and territories.

📌 Plumber/Steamfitter (Chalk River)
🏢 Canadian Nuclear Laboratories
📍 Chalk River