Nuclear Mechanical Engineer – Richland, WA; Remote​/Hybrid

Nuclear Mechanical Engineer to join our growing nuclear engineering team. This role is mechanical engineering–led, with a strong emphasis on applying mechanical design, analysis, and systems engineering within nuclear-regulated environments.

In this position, you will support a nuclear projects, including small modular reactors (SMRs), nuclear facility modifications, and lifecycle engineering activities, working closely with nuclear licensing, regulatory, and multidisciplinary engineering teams. You will also support U.S. Government nuclear nonproliferation programs around the world, including installation, setup, and troubleshooting fixed, mobile, and handheld radiation detection equipment.

This is an excellent opportunity for a mechanical engineer looking to apply their expertise within highly regulated and technically complex environments that directly support national energy infrastructure.

At Tetra Tech, we are Leading with Science to solve the world’s most complex challenges. Our industry-leading experts in engineering and consulting are committed to driving positive change in communities around the world. For over 50 years, we have been at the forefront of innovation and sustainability. Today we stand as a market leader, offering cutting-edge solutions in water, environment, energy, and international development.

Our work has improved more than 625 million lives around the world.

Join Tetra Tech to make a real difference. Our work leverages cutting‑edge technologies, advanced analytics, and the expertise of world‑class scientists and engineers to create meaningful change around the world. Discover your full potential – join us to advance your career while leaving a lasting legacy.

The Nuclear Mechanical Engineer provides mechanical design, analysis, and technical leadership in support of nuclear facilities and systems throughout their lifecycle, from conceptual design through modification, decommissioning, and license termination.

• Apply mechanical engineering principles to nuclear‑regulated systems and facilities
• Perform complex engineering analyses and equipment design
• Develop and review detailed design packages and technical documentation
• Apply expertise in plant systems and operational requirements
• Utilize 3D CAD tools (including Solid Works) for equipment and system design
• Perform mechanical engineering design and analysis for nuclear and radiological facilities, systems, and components
• Develop and review mechanical design deliverables, including calculations, specifications, drawings, and technical reports
• Support system and component design for nuclear facilities, including modifications to operating facilities
• Support preparation and review of licensing‑related technical inputs (e.g., safety analysis support, design basis documentation)
• Assist with feasibility studies, design development, and technical evaluations
• Maintain accurate and complete engineering documentation

• Contribute to projects spanning the full facility lifecycle
• Lead mechanical engineering efforts for nuclear power plant modification projects
• Support field implementation activities at nuclear facilities
• Support project execution with respect to scope, schedule, and budget
• Participate in project planning, scheduling, and execution activities
• Support design reviews, constructability reviews, and engineering evaluations
• Participate in internal and client technical meetings

• Support designs subject to stringent regulatory, safety, and quality requirements
• Interface with nuclear licensing and regulatory staff to ensure mechanical designs align with licensing bases and regulatory commitments
• Ensure compliance with applicable nuclear, regulatory, safety, and quality standards
• Ensure work is performed in accordance with applicable codes, standards, regulations, and quality assurance programs (e.g., NQA-1 where applicable)
• Conduct activities in line with internal procedures, legislation, and industry standards.

• Collaborate…