Environmental, Health & Safety; EHS) Manager

About Radiant

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, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. 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 leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.

We are looking foran Environmental, Health & Safety (EHS) Manager to serve as the company EHS authority supporting Radiant's multi-site manufacturing and operations in a lean, fast-moving environment. This role owns the strategy, development, implementation, and execution of EHS programs and initiatives that protect employees, ensure regulatory compliance, and scale with the business. The EHS Manager maintains a strong shop-floor presence and partners closely with the engineering, manufacturing, and facilities teams to identify hazards, reduce risk, and embed safety and compliance into daily operations.

This role balances hands-on field engagement with strategic thinking, change management, program ownership, regulatory interface, and continuous improvement leadership.

Responsibilities & duties:

Develop Radiant's EHS strategy and own the related implementation roadmap, based on both regulatory compliance and first-principles thinking around business risk.

• Work with the executive team and cross-functional leadership to affect change throughout the organization and lead Radiant through its next phase of EHS and operational maturity.

• Serve as company- and site-levelauthorityfor OSHA / Cal-OSHA compliance, including inspections,regulatory correspondence,record-keeping, and corrective action management.

• Develop, implement, andmaintainrequiredsafety programs(e.g., IIPP, Hazard Communication, Lockout/Tagout, Electrical Safety, Hot Work, Contractor Safety) to support a growing multi-site, multi-State manufacturing operation.

• Develop and leadallsafety trainings for the organization as needed.

• Define andmaintainPPE 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 the facilities team on fire suppression, alarm, detection systems, and other relevant programs.

• Partner with shop-floor teams to identify supportive EHS solutions and embed the EHS mindset into daily work.

• Track and report on keyEHS metrics: drive proactive risk reduction.

• Leadincidentreporting,investigations,and root cause analysisforinjuries,fires,spills,near-misses, and emergency events.

Manufacturing & operations risk mitigation:

• Partner closely with the manufacturing and operations teams toidentifyhazards and implement engineering and administrative controls.

• EvaluateEHS risk for new processes, equipment,tooling,and work centers prior to installation or commissioning toinfluencedesign decisions and ensure safety requirements are met.

• Maintain a regular shop-floor presence toidentifyhazards,observeoperationsanddrivecontinuous improvement initiatives.

Hazardous materials & waste management:

• Own hazardous materials management, including inventory,SDS, labeling, storage compatibility,locations and quantities.

• Ensure…