Are you looking for a role that will challenge you? Do you enjoy being the person who keeps a team organized, informed, and running efficiently? Can you see yourself supporting senior leaders, managing competing priorities, coordinating important business activities, and serving as a key point of contact for a dynamic organization?

In this role as a Senior Administrative Assistant, you will play an integral part in supporting departmental leadership, ensuring the smooth operation of business activities, and contributing to the team's overall success. If you answered yes, then this may be the job for you! Apply today!

What you will be doing!

- Managing office activities and providing administrative support to departmental leadership.
- Acting as a front-line contact for internal and external inquiries while screening, prioritizing, and tracking correspondence.
- Coordinating meetings, preparing agendas, recording meeting minutes, and arranging meeting logistics.
- Preparing, editing, formatting, and assembling presentations, reports, records, and confidential documentation.
- Compiling, tracking, analyzing, and reporting on project, schedule, budget, and operational data.
- Coordinating domestic and international travel arrangements, conference registrations, itineraries, and expense claims.
- Supporting hiring, performance management, succession planning, and other human resources activities.
- Maintaining SharePoint sites, electronic filing systems, shared folders, tracking spreadsheets, and departmental records.
- Assisting staff with preparing and issuing correspondence, reports, and other business documents.
- Monitoring action items and tracking deliverables to ensure commitments are completed on schedule.
- Preparing procurement documentation, purchase requests, and office supply orders.
- Participating in process improvement initiatives, audits, and administrative support activities across the department.
- Other duties as assigned by your manager.

What We Are Looking For

- Education
- Successful completion of secondary school (Grade 12) with related experience, or a college diploma in a related discipline such as Office Administration.

- Experience

- A minimum of five years of experience in an administrative assistant role or equivalent experience.




- Experience providing administrative support to managers and senior leaders.

- Knowledge, Skills & Abilities

- Strong proficiency with Microsoft Office applications, including Word, Excel, PowerPoint, Outlook, and SharePoint.
- Excellent organizational skills with the ability to manage multiple priorities and deadlines.
- Strong verbal and written communication skills.
- Exceptional attention to detail and commitment to accuracy.
- Demonstrated ability to handle sensitive and confidential information with discretion and professionalism.
- Robust interpersonal skills and the ability to build effective working relationships with stakeholders at all levels.
- Demonstrated initiative, adaptability, sound judgment, and problem-solving abilities.

- 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: Five (5) days per week, seven and a half (7.5) hours per day for a thirty-seven and a half (37.5) hour work week.

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.

📌 Senior Administrative Assistant (Chalk River)
🏢 Canadian Nuclear Laboratories
📍 Chalk River