Nuclear Engineer, Core Physics

Radiant Industries; El Segundo (CA); On-site; Full time

Benefits offered by this job

Substantial incentive stock plan

100% medical coverage for employees

Sponsored memberships for One Medical

100% coverage for vision and dental

8-weeks of paid parental leave

Daily catered lunch

Flexible PTO policy

Company bonding events

Job summary

A leading nuclear engineering firm is seeking a Reactor Operations Engineer to design and implement nuclear testing operations at their El Segundo headquarters. Responsibilities include developing procedures, performing reactor physics calculations, and collaborating with engineers. A Bachelor's degree in nuclear engineering and at least 2 years of reactor operations experience are required. The position offers substantial benefits including stock incentives, comprehensive health coverage, and flexible PTO policies, along with a vibrant work environment near the Pacific Ocean.

Qualifications

• Must have a Bachelor's degree in nuclear engineering.
• Minimum of 2 years experience in reactor operations.
• Familiarity with radiation transport methods is required.

Responsibilities

• Collect testing requirements from nuclear engineers.
• Develop procedures to satisfy test requirements.
• Perform reactor physics calculations to verify testing sequence.
• Document testing procedures and support operator training.

Skills

Bachelor’s degree in nuclear engineering or equivalent

2+ years of experience with reactor operations

Experience with radiation transport methods

Knowledge of thermal hydraulic fundamentals

Education

Bachelor’s degree in nuclear engineering

Tools

MCNP

OpenMC

Serpent

Job description

Reactor Operations Engineer, Nuclear

Radiant is a seeking a nuclear engineer responsible for designing and implementing nuclear-specific testing operations at our 2026 demonstration. You will be responsible for the design of a large portion of the test campaign, which includes providing analysis to verify that the proposed testing is both safe and meets the test’s objectives. This position will work closely with nuclear engineers to establish test success criteria and systems / operations engineers to implement written procedures.

Responsibilities and Duties

• Collect testing requirements, objectives, and success criteria from nuclear engineers.
• Develop procedures that satisfy test requirements within the operational bounds of Kaleidos.
• Perform various reactor physics calculations (neutronic and transient analyses) to verify proposed testing sequence addresses all requirements.
• Document testing procedures and support operator training and control room GUI development.

Required Skills and Qualifications

• Bachelor’s degree in nuclear engineering or equivalent degree from an accredited institution.
• 2+ years of experience with reactor operations.
• Experience with radiation transport methods, including with codes such as MCNP/OpenMC/Serpent.
• Knowledge of thermal hydraulic fundamentals.

Desired Skills and Qualifications

• 4+ years of experience with reactor operations.
• Direct experience as a reactor operator of an existing nuclear reactor.
• Hands‑on experience in developing technical procedures, human factors engineering, or operational interface design.

Additional Requirements

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.
• Must work 100% onsite at El Segundo HQ.

Benefits and Perks

• Stock: Substantial incentive stock plan for all full‑time employees.
• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
• One Medical: Sponsored memberships for employees and their dependents.
• Vision: 100% top tier plan coverage + 50% for dependents.
• Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.
• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
• 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
• Daily catered lunch. Free snacks and drinks.
• Flexible PTO policy. Remote workday allocation.
• Company and team‑bonding events, happy hours and in‑person camaraderie.
• Beautiful El Segundo headquarters close to the Pacific Ocean.

Total Compensation and Benefits

Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.

The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [e-mail].

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

Unfortunately, we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.