Senior Stress Engineer, Nuclear Microreactor Systems

Radiant; El Segundo (CA); On-site; USD 134,000 - 185,000; Full time

Benefits offered by this job

Stock options

Medical benefits

Dental and vision plans

Life & disability insurance

Parental leave

Daily catered lunch

Job summary

Radiant is seeking a Stress Engineer in El Segundo to own structural loads, dynamics, and transient analyses for Kaleidos, our portable nuclear microreactor platform. You will lead FEA work, support design decisions, and collaborate across Mechanical, Nuclear, and Test teams.

The role requires hands-on engineering in fast-paced environments, with 4+ years in stress/loads/dynamics and strong experience in ANSYS/Abaqus/Nastran.

Qualifications

• Bachelor’s degree in Mechanical Engineering, Aerospace Engineering, Structural Engineering, or a related field.
• 4+ years of professional experience in stress, loads, dynamics, or structural analysis for complex mechanical systems.
• Strong fundamentals in structural mechanics, dynamics, and vibration.
• Experience with finite element modeling and analysis of metallic and composite structures.
• Proficiency with industry-standard FEA tools (e.g., ANSYS, Abaqus, Nastran).
• Familiarity with design allowables, safety factors, and margin‑of‑safety methodologies.
• Ability to work cross‑functionally and communicate analysis results clearly to both technical and non‑technical stakeholders.

Responsibilities

• Develop and own static, dynamic, and transient loads for reactor systems, support structures, and transport configurations.
• Perform structural dynamics analyses, including modal, random vibration, shock, sine vibration, and fatigue assessments.
• Implement explicit dynamics simulations to model nonlinear reactor response under transient seismic and transportation event cases.
• Define and analyze transportation and handling environments, including shock and vibration from road, rail, air, or sea transport.
• Generate load cases and environments to support structural sizing, design margins, and verification plans.
• Conduct finite element analyses (FEA) using tools such as ANSYS, Abaqus, or similar tools.
• Collaborate with design engineers to influence hardware architecture, material selection, and joint design.
• Support test planning and correlation, including shaker tests, modal surveys, and structural verification testing.
• Develop and maintain analysis documentation, reports, and requirements for internal reviews and regulatory interfaces.
• Contribute to failure investigations, root cause analyses, and design improvements
• Help establish best practices for loads, dynamics, and structural verification within a growing engineering organization.

Skills

Stress analysis

Dynamics

Vibration

FEA tools

Cross-functional comms

Education

B.S. in Mechanical/Aerospace/Structural Engineering

Tools

ANSYS

Abaqus

Nastran

Job description

Radiant is seeking a Stress Engineer in El Segundo to own structural loads, dynamics, and transient analyses for Kaleidos, our portable nuclear microreactor platform. You will lead FEA work, support design decisions, and collaborate across Mechanical, Nuclear, and Test teams.

The role requires hands-on engineering in fast-paced environments, with 4+ years in stress/loads/dynamics and strong experience in ANSYS/Abaqus/Nastran.