Job Description Your Mission on this Role: Principal Process Engineer Join Assystem’s multi-disciplinary engineering team supporting one of our major clients. You’ll work alongside Mechanical, Civil, Electrical, and Piping Engineers to ensure safe, compliant, and efficient design and operation of nuclear facilities. Key Responsibilities Develop, author, and maintain Infrastructure Design Substantiation documents ️ Manage design changes and concessions, ensuring compliance with safety and regulatory standards Prepare and present design justifications to client nuclear safety committees Produce and maintain EIMT (Examination, Inspection, Maintenance & Testing) schedules and reports Contribute to Periodic Review of Safety reports and assessments Provide technical advice and guidance to internal and external stakeholders Conduct Independent Technical Assessments (ITA) and Peer Reviews (IPR) Apply advanced engineering methods and technologies in a high-hazard nuclear environment ✅ Review and approve technical reports, calculations, and safety case submissions