Senior Safety Analysis Engineer

Radiant Industries•El Segundo, CA

18h•Onsite

About The Position

Radiant is seeking a Senior Safety Analysis Engineer to lead reactor safety analyses supporting the design, testing, and deployment of its Kaleidos microreactor. The role evaluates reactor behavior during normal, transient, and accident conditions, assesses safety margins, and develops technically defensible analyses to inform design decisions and regulatory evaluations. Work combines reactor systems and thermal-hydraulic analysis with fuel performance, source-term development, and radiological consequence assessments. The engineer owns complex analytical work from methodology development and model execution through uncertainty evaluation, technical review, and documentation. The role works closely with nuclear design, thermal, mechanical, materials, testing, and regulatory teams. The position is 100% onsite at Radiant’s El Segundo headquarters and may require extended hours when needed.

Requirements

Bachelor’s degree in nuclear engineering, mechanical engineering, or a related technical discipline from an accredited institution.
At least 5 years of relevant experience in reactor safety analysis, thermal-hydraulics, nuclear systems modeling, or related engineering disciplines.
Experience developing and applying reactor systems or safety analysis codes such as RELAP5-3D, TRACE, SAM, MELCOR, or equivalent tools.
Strong understanding of reactor thermal-hydraulics, transient behavior, heat transfer, and deterministic safety analysis.
Knowledge of reactor physics, fuel performance, fission product behavior, and radiological safety principles.
Experience developing or evaluating source terms, radiological consequences, or other safety-related performance calculations.
Experience evaluating modeling assumptions, uncertainty, sensitivity, and conservatism in engineering analyses.
Ability to independently own complex analytical projects and translate results into design requirements, safety conclusions, and technical documentation.
Strong written and verbal communication skills, including experience preparing rigorous calculation packages, technical reports, or safety-related engineering documentation.
Must be mission driven and willing to support extended hours when needed.
Must work 100% onsite at Radiant’s El Segundo headquarters.
Any job offer is contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.

Nice To Haves

Master’s degree or Ph.D. in nuclear engineering, mechanical engineering, or a related technical discipline.
Experience with high-temperature gas-cooled reactors, microreactors, advanced reactors, or first-of-a-kind nuclear systems.
Experience with TRISO fuel performance, irradiation behavior, fuel failure mechanisms, and fission product release and transport.
Familiarity with source-term, dose-consequence, or fuel-performance tools such as ORIGEN, MACCS, PARFUME, or BISON.
Experience with reactor physics and neutronics tools such as MCNP, OpenMC, Serpent, or SCALE.
Familiarity with probabilistic risk assessment (PRA), licensing basis event selection, and risk-informed safety methodologies.
Experience with safety analysis code verification and validation, uncertainty quantification, and nuclear quality assurance practices.
Familiarity with DOE authorization processes, NRC licensing frameworks, nuclear industry codes and standards, or regulatory safety analysis.
Experience supporting reactor testing, safety basis development, regulatory submissions, or technical engagement with regulators.

Responsibilities

Lead deterministic reactor safety analyses for anticipated operational occurrences, transients, and postulated accident scenarios.
Develop and apply system-level thermal-hydraulic and transient models to evaluate reactor response, operating limits, and safety margins.
Perform source-term and radiological consequence analyses, including fuel performance, fission product release and transport, and dose evaluations.
Evaluate uncertainties in reactor physics, power distributions, fuel behavior, and thermal-hydraulic models and their effects on safety conclusions.
Use sensitivity studies, bounding assumptions, and phenomena-ranking methods to develop technically defensible analysis approaches.
Collaborate with nuclear, mechanical, thermal, materials, and controls teams to establish analysis inputs, evaluate design alternatives, and resolve safety-related technical challenges.
Partner with testing and materials teams to identify data gaps, establish validation requirements, and correlate analytical predictions with experimental results.
Develop and improve safety analysis methods, models, and tools, including verification and validation, configuration control, and uncertainty quantification.
Prepare and technically review calculation packages, safety analysis reports, and regulatory documentation supporting reactor design and licensing activities.
Work with regulatory and safety teams to establish safety requirements, support technical submissions, and resolve technical issues through closure.

Benefits

Substantial incentive stock plan for all full-time employees.
Medical coverage up to the base silver-level plan for the employee and 50% of dependent coverage; plans up to Platinum are offered.
Sponsored One Medical memberships for employees and their dependents.
Vision coverage at 100% for the top-tier plan and 50% for dependents.
Dental coverage at 100% for the top-tier plan, with orthodontia extra, and 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter, and FSA/HSA benefits are offered as employee-contributed benefits.
Eight weeks of paid parental leave for all parents.
Additional paid pregnancy leave for California 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.
Base salary, substantial equity grants, and comprehensive health benefits.