Tetra Tech has in-depth understanding of both U.S. and Canadian nuclear licensing and regulatory requirements, with more than 40 years of internationally recognized credentials in the areas of nuclear licensing, analysis, regulatory program support, design, and project management.

Tetra Tech’s wide-ranging, multidiscipline design expertise is derived from a combination of experience and training gained from collaborating with architect-engineer firms and nuclear steam supply system (NSSS) vendors and through new nuclear facility design and construction. Our team supports major commercial reactor types in operation in North America, including pressurized water reactors (PWRs), boiling water reactors (BWRs), and pressurized heavy water reactors (PHWRs), providing proven processes that reinforce control, feedback, and continuous improvement.  

Tetra Tech maintains its own 10 CFR 50 Appendix B Quality Assurance (QA) Program, as well as providing our clients with certified lead auditors, technical specialist support, third party audits, QA program assessments and improvements, and QA program training. We independently prepare and review safety-related calculations and reports that emphasize logic, clarity, consistency, and completeness or perform such activities using the client’s QA Program.  

In addition, Tetra Tech’s Canadian offices maintain a separate quality management system, which has undergone external audits to ensure compliance with the CSA / N285, ASME App. XXIII; CSA / N286.2; CSA / N286-05; CSA / N286.7; ISO9001:2008; and CSA / Z299.1 standards. 

Our commercial nuclear power services include:

Analytical Analysis

  • HVAC loss analysis 
  • Pipe stress analysis
  • Safe shutdown analysis
  • Electrical load analysis
  • Shielding design and evaluation – MCNP, Microshield
  • Thermal hydraulic modeling analysis – GOTHIC


  • Criticality safety and system automation
  • Design basis and configuration management
  • FLEX strategy and analysis
  • Nuclear security system design
  • Plant modification
  • Seismic assessment 
  • Severe Accident Mitigation Alternatives (SAMA)
  • System engineering and operability design 

Engineering, Procurement, and Construction (EPC) 

  • Conceptual studies and design requirements
  • Preliminary and detailed design
  • Bid preparation, review, and evaluation
  • Commissioning and turnover
  • Field engineering
  • Procurement specification development
  • Receipt and inspection services
  • Supplier management
  • Work planning and installation plans

Regulatory Programs

  • Aging management and condition assessments 
  • Appendix R and fire protection evaluations and analysis
  • Asset management and equipment reliability 
  • Corrective action planning
  • Emergency planning
  • Equipment qualification (EQ)
  • Nuclear training
  • Quality assurance (QA)
  • Preventative maintenance planning and support

Related Projects

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Emergency Power Replacement

Emergency Power Replacement at Nuclear Generating Station

Providing conceptual, preliminary, and detailed design for the replacement of the standby emergency power generators in Pickering, Ontario

Tetra Tech supported the disposition of more than 400,000 cubic feet of unneeded legacy classified items from the Y-12.

Nuclear Materials Management Support

Providing technical expertise and historical knowledge to support nuclear materials management at the Department of Energy’s Y 12 Complex

Early construction on  Vogtle Electric Generating Plant Units 3 and 4

Vogtle Nuclear Plant Expansion Permitting and Licensing

Providing key technical and environmental support to pave the way for the first new U.S. nuclear power operating license in more than 30 years

Diablo Canyon

Diablo Canyon LiDAR and Photogrammetry

Supporting analysis of seismic activity along the California coastline near an operating power plant

Remote Emergency Power Generator for Ontario Power Generation

Fast-tracked EPCM project brought power system online 12 weeks from project start