Reactor Systems Engineer

About the role

Ocean Atomics is an American company designing, licensing, and assembling a standardized nuclear electric power plant and the surrounding support systems for maritime applications. The Reactor Systems Engineer will define the arrangement of the primary system, build and run system-level thermal-hydraulic models, and design and analyze the system architecture across normal, transient, and accident conditions.

Responsibilities

• Define and maintain the arrangement of the primary system and its interfaces with supporting systems
• Build, run, and maintain system thermal-hydraulic models spanning steady-state, transient, and accident scenarios
• Design and analyze decay heat removal architectures and demonstrate adequate cooling for limiting events, leveraging the maritime environment as appropriate
• Support trade studies that balance arrangement, component sizing, and safety margins
• Rigorously document analysis results and justify methodology and V&V in support of the licensing process
• Couple system models with neutronics and structural inputs to support multiphysics and transient studies
• Provide primary system and accident-response information to safety analysis, simulator, and operations teams

Requirements

• Experience building and running system thermal-hydraulic models of nuclear plants
• Strong understanding of primary system behavior, including natural circulation, two-phase flow, and the design tradeoffs between active and passive cooling
• Working knowledge of decay heat removal design and the design basis events that size it
• Strong working knowledge of one or more reactor systems codes (e.g. RELAP5-3D, TRACE)
• Ability to work on a close, rapidly iterative design team and translate analysis into arrangement decisions
• Strong technical writing skills

Qualifications

• Bachelor's degree in Nuclear or Mechanical Engineering
• 5+ years designing or analyzing reactor primary systems
• Familiarity with multiple system and subchannel/CFD tools (e.g. RELAP5-3D, TRACE, GOTHIC, COBRA, STAR-CCM+)
• Familiarity with coupling system models to neutronics
• Experience supporting safety analysis and licensing basis development (DBAs, LOCA/non-LOCA, station blackout)

Pay

Compensation Range: $110K - $240K

Why this matters

Every industry on Earth needs scalable, clean energy, and the ocean is the ideal place to unlock it. Joining Ocean Atomics means building real, lasting infrastructure — the kind that powers generations. The world needs abundant energy. Let's make it happen.

Ocean Atomics LLC is an equal opportunity employer. We are committed to a workplace free of discrimination and do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, veteran status, or any other characteristic protected by applicable law.

This role involves access to information subject to U.S. export control laws, including unclassified nuclear technology governed by the U.S. Department of Energy under 10 CFR Part 810. Depending on a candidate's status, access may require DOE authorization, which Ocean Atomics may apply for. Any offer is contingent on your ability to work in compliance with these requirements.