Nuclear Engineer Iii​/Iv; Structures

Key Responsibilities

• Develop detailed CAD models for nuclear system components, mechanical assemblies, piping, shielding, and structural elements.
• Develop structural loads in coordination with other engineering teams
• Analyze and size components, assemblies and systems based on developed loads using industry standards, engineering calculations and FEM.
• Develop and implement analysis methods that to include static, cyclic and thermal loads.
• Support design, development and execution of structural and hydraulic tests.
• Create analysis reports to support reactor licensing per business standards.
• Coordinate across disciplines to ensure all loads and design constraints are fully understood and captured.
• Maintain configuration control, analysis standards, revision logs, and documentation in accordance with nuclear QA frameworks (e.g., ASME NQA-1, ANSI/ANS standards).
• Support design reviews by preparing designs, analysis, interface checks, and tolerance analyses.
• Collaborate closely with other mechanical, nuclear, thermal-hydraulic, and systems engineers to refine concepts, resolve design issues, and ensure alignment across disciplines.
• Assist in vendor interface by providing clear specifications, answering technical queries, and updating designs/analysis as needed.
• Contribute to continuous improvement of design and analysis workflows, libraries, and standards.
• Willing to relocate to Madison, WI

• Bachelor’s or Master's degree in Mechanical, Nuclear, Aerospace or related field and 10+ years experience in structures design and analysis roles.
• Proficiency with modern CAD tools (e.g., Solid Works, Inventor, Creo, AutoCAD, or similar).
• Experience with high temperature structural design and analysis.
• Expertise in common structural analysis software (ANSYS, NASTRAN, FEMAP etc)
• Experience applying nuclear-industry standards (ASME, ASTM, RCC-MRx, etc.).
• Ability to read, interpret, and develop engineering drawings.
• Detail-driven mindset with a disciplined approach to documentation and version control.
• US Citizenship, or Permanent Resident status required.

• Experience in reactor design, radiation shielding, balance‑of‑plant systems, or nuclear fuel cycle equipment.
• Familiarity with PLM/PDM systems (Windchill, Teamcenter, etc.).
• Background in piping design, pressure vessel design, or seismic qualification and fatigue spectrum development.
• Exposure to manufacturing processes, suppliers, and tolerancing best practices in regulated environments.

• Bachelor's (Required)

• In person

• Competitive salary with equity options
• Comprehensive benefits, holiday and PTO schedule
• Opportunity to shape supply chain operations in a groundbreaking nuclear startup

• Dental insurance
• Health insurance
• Life insurance
• Paid time off
• Vision insurance

• Development and analysis of reactor structures designs that meet business timelines , objectives and quality standards.
• Use of creative problem solving to find ways to accelerate development while maintaining quality standards and design objectives.
• You communicate clearly and communicate effectively, to maintain coordination across the IPT.
• You take ownership of your work and help push Fissionaire’s designs forward with confidence and precision.