Senior Reactor Test Engineer: Microreactor Hardware

Radiant; El Segundo (CA); On-site; USD 150,000 - 230,000; Full time

Benefits offered by this job

Stock: Substantial incentive stock

Medical: 100% up to base silver plan

One Medical: Sponsored memberships

Vision: 100% coverage

Dental: 100% coverage

Flexible PTO

Daily catered lunch

On-site snacks

Job summary

Radiant in El Segundo, CA, seeks a Senior Reactor Engineer to lead testing and verification of core assemblies, reactivity control mechanisms, instrumentation, and related reactor subsystems for the Kaleidos microreactor. You will own testing from requirements definition to data analysis and documentation, working with nuclear, mechanical, thermal, and controls engineers.

You will translate test results into design improvements, review procedures, and support operations, commissioning and

Qualifications

• Bachelor's degree in nuclear engineering, mechanical engineering, or a related technical discipline.
• 5+ years of relevant experience in reactor engineering, hardware testing, design verification, or complex hardware development.
• Demonstrated experience developing and executing component or subsystem tests, including planning, instrumentation, data analysis, and performance evaluation.
• Strong engineering fundamentals in mechanical systems, heat transfer, materials, instrumentation, and component performance.
• Understanding of reactor operating principles, safety functions, and component-level performance requirements.
• Experience developing technical procedures, establishing acceptance criteria, and evaluating results against engineering requirements.
• Experience troubleshooting hardware failures, conducting root cause investigations, and implementing design improvements.
• Ability to interpret engineering drawings, specifications, and technical requirements while independently owning multidisciplinary engineering projects.

Responsibilities

• Lead testing and verification of reactor components, mechanisms, and subsystems, including core assemblies, reactivity control mechanisms, instrumentation, and associated hardware.
• Own test activities from requirements definition and planning through execution, data analysis, and documentation.
• Develop test plans, procedures, instrumentation requirements, and acceptance criteria to verify hardware performance against design and safety requirements.
• Collaborate with nuclear, mechanical, thermal, and controls engineers to develop test strategies, evaluate designs, and resolve technical challenges.
• Perform engineering analyses and compare experimental results against analytical predictions and design assumptions.
• Review and technically approve test procedures, verification reports, and engineering documentation within assigned authority.
• Support reactor operations, commissioning, and integrated testing through procedure reviews, readiness assessments, and technical evaluations.
• Investigate hardware failures and test anomalies, identify root causes, and work with design teams to implement corrective actions.
• Translate test findings into design improvements while maintaining rigorous requirements traceability, documentation, and configuration control.

Skills

Test planning & data analysis

Strong engineering fundamentals

Cross-disciplinary collaboration

Troubleshooting hardware failures

Independent project ownership

Reactor operating principles

Education

Bachelor's degree in nuclear/mechanical engineering

Master's degree or Ph.D. preferred

Tools

Python

MATLAB

Job description

Radiant in El Segundo, CA, seeks a Senior Reactor Engineer to lead testing and verification of core assemblies, reactivity control mechanisms, instrumentation, and related reactor subsystems for the Kaleidos microreactor. You will own testing from requirements definition to data analysis and documentation, working with nuclear, mechanical, thermal, and controls engineers.

You will translate test results into design improvements, review procedures, and support operations, commissioning and