Senior Nuclear Engineer - Kinetics

RadiantOnsite

Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.

Senior Nuclear Engineer - Kinetics

Radiant is seeking a driven Senior Nuclear Engineer with a focus on reactor kinetics 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 achieve company goals.
Must work 100% onsite at El Segundo HQ.

Employee Benefits for Eligible Employees:

Stock: Substantial incentive stock plan for all full time, salaried 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 are offered as employee contributed benefits.
Free snacks and drinks onsite.
Flexible PTO policy.

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.

Life at Radiant

Radiant is a team of innovators and communicators creating digital products that bring out the best in people, families and communities. At Radiant we believe in human light - the raw potential within each of us to do extraordinary good.

Thrive Here & What We ValueFlexible PTO policy | Free snacks and drinks onsite | Employee benefits for eligible employees (stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, FSA) | Equal opportunity employer | Unable to provide visa sponsorship at this time.</s> | 1. Substantial incentive stock plan for all full time, salaried employees. | 2. 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. | 3. One Medical: Sponsored memberships for employees and their dependents. | 4. Vision: 100% top tier plan coverage + 50% for dependents. | 5. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits. | 6. Free snacks and drinks onsite. | 7. Flexible PTO policy.</s> | 1. Flexible PTO policy | 2. Free snacks and drinks onsite | 3. Employee Benefits for Eligible Employees: Stock, Medical, Vision, Dental, Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits.</s> | Free snacks and drinks onsite</s> | 4. Equal Opportunity Employer | 5. Access to technology that is subject to U.S. export controls.</s> | 3. Employee benefits for eligible employees include stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, and FSA plans</s> | 2. One Medical: Sponsored memberships for employees and their dependents. | 3. Flexible PTO policy. | 4. Free snacks and drinks onsite. | 5. 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. | 6. Unfortunately, we are unable to provide visa sponsorship at this time.</s> | Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. | Climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. | Plan to test development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. | Goal is to bring one of the world's first factory-constructed microreactors to market. | Microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.</s> | Medical benefits for employees and dependents | Vision benefits for employees and dependents | Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits</s> | Vision: 100% top tier plan coverage + 50% for dependents</s> | 1. Flexible PTO policy. | 2. Free snacks and drinks onsite. | 4. 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. | 5. 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.</s> | 4. 100% top tier plan coverage + 50% for dependents for medical, dental, and vision insurance | 5. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits.</s> | 3. Employee benefits for eligible employees, including stock incentives, medical coverage, dental coverage, vision coverage, voluntary life, accident, hospital, critical illness, commuter and FSA options</s> | 3. Employee Benefits for Eligible Employees (Stock, Medical, Vision, Dental) | 5. No Visa Sponsorship at This Time</s> | Radiant is 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. | Radiant offers employee benefits such as stock incentives, medical and dental coverage, vision coverage, voluntary life, accident, hospital, critical illness, commuter and FSA plans. | Radiant provides free snacks and drinks onsite and has a flexible PTO policy.</s> | 4. Equal Opportunity Employer</s>

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Senior Nuclear Engineer - Kinetics