Nuclear Engineer (SMR ​/ MMR Reactor Design, Licensing & Safety Programs

About Ba Rup On  LLC

Ba Rup On  LLC is a vertically integrated American company with operations spanning energy, healthcare, and infrastructure, headquartered in Irvine, California. Ba Rup On  is actively developing Small Modular Reactor (SMR) and Micro Modular Reactor (MMR) technologies for deployment across the United States, with a mission to deliver safe, reliable, and innovative clean energy solutions that accelerate decarbonization and strengthen domestic energy security.

Ba Rup On  LLC is seeking talented and technically driven Nuclear Engineers to join its growing SMR and MMR development team. This is a hands‑on engineering role at the heart of Ba Rup On ’s reactor programs, spanning reactor design, safety analysis, NRC licensing support, and operational compliance.

This position is open to candidates across experience levels — from mid‑level engineers with foundational nuclear industry experience to senior engineers with deep SMR/MMR, licensing, or safety analysis expertise. The right candidate brings technical rigor, a commitment to nuclear safety, and the drive to help design and build next‑generation reactor systems from the ground up.

Nuclear Engineers at Ba Rup On  will work directly under the CTO and CNO, contributing across multiple technical work streams and growing with the organization as the program scales.

• Support the design, development, and optimization of SMR and MMR reactor systems, including core design, thermal hydraulics, neutronics, and fuel cycle analysis.
• Perform engineering calculations, simulations, and design analyses to support reactor development and licensing submissions.
• Contribute to system integration across nuclear, mechanical, electrical, and instrumentation and controls (I&C) disciplines.
• Ensure all design work complies with applicable U.S. nuclear codes and standards, including ASME BPVC, ANSI, and IEEE standards.
• Support the development and maintenance of design basis documentation, technical specifications, and engineering change packages.

• Assist in the preparation, review, and submission of NRC licensing documentation, including:
  • Safety Analysis Reports (SAR / FSAR)
  • Probabilistic Risk Assessments (PRA)
  • Environmental Reports (ER) in compliance with NEPA
  • Requests for Additional Information (RAI) responses
• Support pre‑application engagement activities and technical interactions with the U.S. Nuclear Regulatory Commission.
• Ensure engineering work products are prepared in compliance with 10 CFR Parts 50, 52, and the emerging Part 53 framework for advanced reactors.
• Maintain thorough documentation of engineering analyses and design decisions to support licensing traceability.

• Perform deterministic and probabilistic safety analyses to support reactor design and licensing, including loss‑of‑coolant accident (LOCA), transient, and beyond‑design‑basis event analyses.
• Develop and maintain PRA models, including initiating event analysis, fault trees, and event trees.
• Support the development and maintenance of the safety case, ensuring design margins are maintained and safety functions are preserved.
• Identify and assess design vulnerabilities, recommend mitigation strategies, and support risk‑informed decision‑making.

• Support the development of operational procedures, surveillance test instructions, and technical specifications aligned with NRC requirements.
• Participate in the Corrective Action Program (CAP), identifying and resolving conditions adverse to quality in accordance with 10 CFR 50 Appendix B.
• Support operational readiness reviews, pre‑startup assessments, and post‑modification testing activities.
• Ensure all engineering work is performed and documented in compliance with the Company’s nuclear quality assurance program.

• Bachelor’s degree in Nuclear Engineering, Mechanical Engineering, Physics, or a closely related technical field. Master’s degree or PhD preferred for senior‑level candidates.
• Minimum 3 years of experience in the U.S. nuclear industry for mid‑level candidates;…