Senior Nuclear Engineer

Radiant Industries; El Segundo (CA); On-site; USD 100,000 - 130,000; Full time

Benefits offered by this job

Substantial incentive stock plan

100% medical coverage up to silver plan

Paid parental leave

Flexible PTO policy

Daily catered lunch

Job summary

A leading engineering firm in California is seeking a driven Senior Nuclear Engineer to own modeling methods and reactor physics calculations critical for safety analysis. The ideal candidate will have a bachelor's in nuclear engineering and over 4 years of experience with Monte Carlo software such as OpenMC. The role involves direct involvement in commercialization of a unique nuclear reactor technology at the company's El Segundo headquarters. Comprehensive benefits include stock options and flexible PTO.

Qualifications

• 4+ years of experience with Monte Carlo nuclear engineering software.
• Experience documenting analysis methods and assumptions.
• Strong programming skills in any language, preferably Python.

Responsibilities

• Own modeling methods of core neutronics and reactor physics calculations.
• Perform calculations of energy deposition distributions and reactivity coefficients.
• Verify assumptions and assess conservatism of neutronics models.

Skills

Monte Carlo nuclear engineering software

Programming in Python

Knowledge of reactor kinetics

Communication with cross-functional teams

Education

Bachelor’s degree in nuclear engineering

Job description

Senior Nuclear Engineer

Radiant is seeking a driven Senior Nuclear Engineer to join our team! You will own modeling methods and reactor physics calculations of neutronics parameters such as reactivity, kinetics parameters, and energy deposition distributions used within our cutting‑edge custom‑made Digital Twin simulation software. You’ll be responsible for assessing conservatism and verifying assumptions within the modeling methods and documenting all results. Because these methods are pivotal in the safety analysis, you will play a key role in the commercialization of the first mass‑produced nuclear reactor.

Responsibilities and Duties

• Own modeling methods of core neutronics and reactor physics calculations supporting Radiant’s transient safety analyses.
• Perform calculations of energy deposition distributions, reactivity coefficients, kinetics parameters, and control blade worths to input into Digital Twin models.
• Verify assumptions and assess conservatism of neutronics models.
• Document methods for both technical and non‑technical audiences.
• Assist in Verification & Validation (V&V) efforts for the Digital Twin.
• Review and support other nuclear analyses across the company in reactor physics, shielding, and radiation detection.

Required Skills and Qualifications

• Bachelor’s degree in nuclear engineering or a similar field from an accredited institution.
• 4+ years of experience with Monte Carlo nuclear engineering software such as OpenMC, MCNP, Serpent, SCALE, etc.
• Experience documenting analysis methods and assumptions.
• Strong programming skills in any language, preferably Python.

Desired Skills and Qualifications

• Knowledge and experience in reactor kinetics.
• Basic knowledge of thermal hydraulic principles.
• Experience communicating and distilling information with cross‑functional teams.
• Driven, self‑motivated, and takes ownership of work end to end.

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.