Environmental, Health & Safety; EHS Manager

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. Portable nuclear power with rapid deploy capability can replace similar-sized diesel generators, and provide critical asset support for hospitals, data centers, remote sites, and military bases.

Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory‑built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.

We are seeking an Environmental, Health & Safety (EHS) Manager to serve as the site‑level EHS authority supporting manufacturing and operations in a lean, fast‑moving environment. This role owns the development, implementation, and execution of EHS programs that protect employees, ensure regulatory compliance, and scale with the business. The EHS Manager maintains a strong shop‑floor presence and partners closely with Manufacturing, Operations, and Facilities to identify hazards, reduce risk, and embed safety and environmental compliance into daily operations.

This role balances hands‑on field engagement with program ownership, regulatory interface, and continuous improvement leadership.

Safety leadership and OSHA compliance:

• Serve as the site authority for OSHA / Cal‑OSHA compliance, including inspections, regulatory correspondence, recordkeeping, and corrective action management.
• Develop, implement, and maintain required safety programs (e.g., IIPP, Hazard Communication, Lockout/Tagout, Electrical Safety, Hot Work, Contractor Safety) to support a growing manufacturing operation.
• Develop and lead all safety training.
• Define and maintain PPE requirements, conduct hazard assessments, and ensure proper selection, training, and usage.
• Own emergency preparedness programs, including Emergency Action Plans, evacuation procedures, drills, and emergency response coordination.
• Partner with Facilities on fire suppression, alarm, and detection systems.
• Conduct routine shop‑floor safety observations.
• Track leading and key EHS metrics and drive proactive risk reduction.
• Lead incident reporting, investigations, and root cause analysis for injuries, fires, spills, near‑misses, and emergency events.

Manufacturing & Operations Risk Mitigation:

• Partner closely with manufacturing and operations teams to identify hazards and implement engineering and administrative controls.
• Evaluate EHS risk for new processes, equipment, tooling, and work centers prior to installation or commissioning to influence design decisions and ensure safety requirements are met.
• Maintain a regular shop‑floor presence to identify hazards, observe operations and drive continuous improvement initiatives.

Hazardous Materials & Waste Management:

• Own hazardous materials management, including inventory, SDS, labeling, storage compatibility, locations and quantities.
• Ensure compliant handling and storage of hazardous materials, including flammable and combustible materials.
• Manage hazardous waste accumulation areas, manifests, inspections, and disposal vendor coordination.

Environmental Compliance & Permitting:

• Manage and maintain environmental permits and programs, including hazardous materials, hazardous waste, air emissions, wastewater, and stormwater.
• Ensure permit conditions and regulatory requirements are implemented, documented, and routinely verified.
• Lead environmental inspections and regulatory interactions with local, state, and federal agencies as required.
• Track leading and key EHS metrics and drive proactive risk reduction.
• Partner with Facilities on facility modifications, construction, and equipment installations to ensure safety and environmental requirements are addressed.

• Bachelor’s degree in environmental…