Valar Atomics is scaling nuclear energy for heavy industrial power and clean hydrocarbon fuel production. Backed by Sequoia.
About the role
ModSim works alongside the engineering and licensing organizations and develops and maintains the models that underpin design basis definition, transient and accident analysis, safety case development and regulatory submittals, applying rigorous verification, validation and uncertainty quantification throughout.
What they're looking for
- Neutronics and reactor design,
- Thermal-hydraulics systems analysis covering steady-state and transient performance of the complete system, and
- Computational fluid dynamics and finite element analysis for detailed flow, thermal, and structural integrity assessment
- Master’s degree in engineering (MSc/MEng), or equivalent work experience required — Nuclear, Mechanical, Aerospace, or a closely related discipline, PhD strongly preferred
- Demonstrated experience taking modeling and analysis through to design, constructed and/or operating hardware – not solely paper studies
- Depth in at least one of CFD, FEA, thermal-hydraulics or neutronics, with the breadth to direct and critically review the others
More about this role
At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level.
The Team
The ModSim Engineering Group is a dynamic analysis and engineering group that provides the analytical foundation for reactor and plant design, delivering high-fidelity computational analysis, integrated directly into the engineering design process.
- Neutronics and reactor design;
- Thermal-hydraulics systems analysis covering steady-state and transient performance of the complete system; and
- Computational fluid dynamics and finite element analysis for detailed flow, thermal, and structural integrity assessment.
ModSim works alongside the engineering and licensing...
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