Senior Nuclear Design & Analysis Engineer

US Health Partners, LLC; El Segundo (CA); On-site; USD 150,000 - 210,000; Full time

Benefits offered by this job

Stock options

Medical insurance

One Medical

Vision coverage

Dental coverage

Life insurance

Parental leave

Lunch provided

Flexible PTO

Company events

Job summary

Radiant, based in El Segundo, CA, seeks a Staff Nuclear Engineer to lead nuclear design and analysis for Kaleidos. You’ll own multidisciplinary workstreams, develop high‑fidelity transport models, and drive design decisions through validation, testing, and regulatory documentation.

You will mentor engineers, establish standards, and collaborate with reactor systems, thermal, mechanical, electrical, and safety teams to resolve complex design challenges. This role is onsite with strong autonomy.

Qualifications

• Bachelor’s degree in nuclear engineering or a related technical discipline from an accredited institution.
• 8+ years of relevant nuclear engineering experience across reactor design, analysis, testing, licensing, safety, or operations.
• Demonstrated experience owning complex nuclear engineering projects involving multiple technical disciplines and stakeholders.
• Deep knowledge of neutron transport theory, Monte Carlo simulation methods, nuclear data, and statistical convergence.
• Professional experience developing and applying MCNP, OpenMC, or comparable neutron and radiation transport models.
• Strong understanding of reactor physics concepts, including criticality, reactivity coefficients, depletion, power distribution, shutdown margin, neutron and gamma transport, and uncertainty analysis.
• Experience translating analytical results into reactor design decisions, technical requirements, safety conclusions, or regulatory documentation.
• Experience developing or reviewing technically rigorous analysis methodologies, models, calculation packages, or engineering standards.
• Familiarity with model verification and validation, configuration control, peer review, and nuclear software quality practices.
• Demonstrated ability to operate independently on technically complex problems and drive work from definition through technical closure.
• Strong written and verbal communication skills, including the ability to explain complex analyses, assumptions, uncertainties, and technical conclusions to multidisciplinary teams.

Responsibilities

• Provide technical leadership across reactor physics, core performance, shielding, dose and activation, thermal‑hydraulics, safety analysis, I&C, and reactor operations.
• Own complex nuclear engineering projects from requirements capture and design iteration through model development, analysis, technical review, and final documentation.
• Perform and guide analyses of criticality, reactivity control, shutdown margin, power distribution, depletion, temperature feedback, radiation transport, dose, activation, and shielding performance.
• Develop, review, and improve high‑fidelity neutron and radiation transport models used to support reactor design, safety, testing, and regulatory evaluations.
• Translate analytical results into actionable requirements and design decisions affecting the core, shielding, control systems, instrumentation, fluid systems, structures, and surrounding hardware.
• Lead multidisciplinary technical trades and evaluate the interaction between nuclear performance, thermal behavior, mechanical design, controls, operations, manufacturability, and safety.
• Establish and improve rigorous practices for model verification and validation, peer review, configuration control, uncertainty evaluation, and technical documentation.
• Ensure analytical assumptions, limitations, uncertainties, margins, and conclusions are clearly documented and technically defensible.
• Develop analytical methods, workflows, and tools that improve the accuracy, efficiency, and scalability of Radiant’s nuclear engineering capability.
• Collaborate with reactor systems, thermal, mechanical, electrical, test, operations, safety, and regulatory teams to resolve multidisciplinary design challenges.
• Work with the regulatory organization to translate applicable nuclear standards and requirements into analysis plans, design criteria, calculation packages, and verification activities.
• Support reactor testing and startup by defining analysis needs, instrumentation requirements, acceptance criteria, and methods for comparing predicted and measured performance.
• Provide technical mentorship and review for engineers across nuclear design and analysis activities.
• Identify technical risks, develop practical mitigation strategies, and drive complex nuclear engineering problems through closure.
• Communicate technical status, risks, decisions, and recommendations clearly to engineering teams and company leadership.

Skills

Nuclear engineering knowledge

MCNP/OpenMC proficiency

Reactor physics concepts

Analytical methods development

Multidisciplinary collaboration

Communication skills

Education

Bachelor’s in nuclear engineering

Tools

MCNP

OpenMC

Job description

Radiant, based in El Segundo, CA, seeks a Staff Nuclear Engineer to lead nuclear design and analysis for Kaleidos. You’ll own multidisciplinary workstreams, develop high‑fidelity transport models, and drive design decisions through validation, testing, and regulatory documentation.

You will mentor engineers, establish standards, and collaborate with reactor systems, thermal, mechanical, electrical, and safety teams to resolve complex design challenges. This role is onsite with strong autonomy.