Senior Mechanical Design Engineer

Position Overview:

System One is seeking a Senior Mechanical Design Engineer to support the Molten Chloride Fast Reactor (MCFR) program and the Molten Chloride Reactor Experiment (MCRE) . This role plays a key part in designing and analyzing mechanical systems that support both the non-nuclear MCRE mockup and the delivery of qualified MCRE hardware . The successful candidate will collaborate closely with vendors, project engineers, and technical leads to help deliver hardware for the first liquid-fueled, fast-spectrum reactor to be constructed and operated at Idaho National Laboratory .

• Coordinate input and requirements from engineering and project teams to develop mechanical design solutions

• Create 3D models of systems, structures, and components using CAD tools (SolidWorks preferred)

• Conduct mechanical analyses including hand calculations and finite element analysis (ANSYS preferred)

• Develop engineering drawings in compliance with ASME Y14.1 and Y14.5 standards

• Draft and maintain technical documentation such as design specifications, mechanical load descriptions, and reports

• Support planning and scheduling of design activities

• Review vendor submittals and manage technical coordination with suppliers

• Present design concepts and analysis results to internal teams and stakeholders

• B.S. in Mechanical Engineering or related discipline from an accredited university with 6+ years of relevant experience, or

• M.S. in Mechanical Engineering or related discipline with 3+ years of experience

• EIT certification or PE license preferred

• Proficiency in CAD software (SolidWorks preferred)

• Experience using mechanical analysis tools (ANSYS preferred)

• Demonstrated success in delivering qualified hardware and documentation packages

• Strong attention to detail in reviewing technical documents, drawings, and calculations

• Experience working within a formal quality program (NQA-1 or ISO 9001 preferred)

• Excellent verbal and written communication skills

• Ability to work in a highly collaborative, multidisciplinary environment

• Motor Abilities: Sitting or standing for extended periods, bending/stooping, fine motor control, grasping/gripping

• Physical Requirements: Minimal physical exertion; must be able to safely lift up to 25 lbs

• Work Environment: Office-based, computer-intensive work; may include stairs and typing/keyboarding for extended periods

• Work Hours: Standard 8+ hour workdays

• Travel: Occasional (05%)