Nuclear Safety Analysis Engineer

Overview

Interested in helping us transform thermal and electric energy? Become a part of the leading Generation‑IV nuclear plant development team.

This position is remote until the office opens in or around Bryan, TX on or before February 2026, after which it will be a 100% on site role.

Come join us at Terrestrial Energy, a US developer of advanced Generation‑IV nuclear reactors. We are growing our workforce to develop and deploy our Integral Molten Salt Reactor (IMSR) small modular nuclear plant to provide cost‑competitive, clean firm heat and power to industry.

With a recent merger creating a publicly listed operating company (NASDAQ “IMSR”), we are positioned to participate in the execution of the company’s growth business plan.

We are building a high‑performing team of experts to lead the company into expansion. We are seeking people who can help build the organization, processes, and corporate culture to lead the company in its expansion.

The Safety Analysis Engineer, under the direction of Safety Manager, is critical to demonstrating the safety characteristics of Terrestrial Energy’s IMSR technology and supporting regulatory licensing activities. The successful candidate is primarily responsible for performing comprehensive safety analyses, developing accident scenarios, and contributing to safety case documentation that demonstrates compliance with regulatory requirements and the inherent safety features of our advanced reactor design.

• Perform deterministic and probabilistic safety analyses for the IMSR design
• Develop and analyze Design Basis Accidents (DBAs) and Beyond Design Basis Accidents (BDBAs)
• Conduct transient and accident analysis using thermal‑hydraulic and neutronics codes
• Evaluate plant response to Postulated Initiating Events
• Assess the performance of Safety Systems and engineered safety features
• Analyze dose consequences and radiological release scenarios
• Perform sensitivity and uncertainty analyses

• Develop and validate computer models for safety analysis using industry‑standard codes
• Build thermal‑hydraulic models of reactor systems and components
• Perform single and coupled physics simulations
• Validate models against experimental data and benchmarks
• Document modeling assumptions, methodologies, and results

• Prepare safety analysis chapters for licensing documentation including Preliminary Safety Analysis Report (PSAR) and Final Safety Analysis Report (FSAR) for NRC/CNSC licensing
• Develop DOE‑required safety analyses including Preliminary Documented Safety Analysis (PDSA) and Documented Safety Analysis (DSA) in accordance with DOE‑STD‑3009
• Highlight key safety decisions including target performance of structures, systems, and components (SSCs), safety system responses to normal and off‑normal operations, and facility security considerations
• Define classification rules and terminology for safety SSCs, including application of the hierarchy of controls and Defense in Depth principles to ensure safety
• Perform analysis of most limiting potential dose consequences (e.g., unmitigated or Maximum Hypothetical Accident scenarios) to support Natural Phenomena Hazard (NPH) Natural Design Category (NDC) categorization
• Support validity assessment of selected safety document format and content, applicability of SSC classifications, and other graded approaches
• Support regulatory review processes and respond to technical questions from regulatory bodies (CNSC, NRC, DOE)
• Ensure analyses comply with applicable regulatory requirements and guidance
• Participate in regulatory meetings and technical discussions
• Support development of technical specifications and operational limits

• Prepare detailed technical reports documenting analysis methodologies, assumptions, and results
• Create clear visualizations and presentations of analysis results
• Maintain comprehensive documentation of safety analysis activities
• Contribute to technical publications and conference papers
• Develop and maintain analysis procedures and quality assurance documentation

• Work closely with Physics, Thermal‑Hydraulics, Systems Engineering,…