Senior Safety Analysis Engineer

The role

You will lead reactor safety analyses to support the design, testing, and deployment of Kaleidos. This role involves evaluating reactor behavior, assessing safety margins, and developing technical analyses for design and regulatory decisions.

What you will do

• Lead deterministic reactor safety analyses covering operational occurrences, transients, and accident scenarios.
• Develop and apply system-level thermal-hydraulic and transient models.
• Perform source term and radiological consequence analyses.
• Evaluate uncertainties in reactor physics, power distributions, fuel behavior, and thermal-hydraulic models.
• Apply sensitivity studies, bounding assumptions, and phenomena-ranking methods.
• Collaborate with nuclear, mechanical, thermal, materials, and controls teams.
• Partner with testing and materials teams to identify data gaps and correlate predictions with experimental results.
• Develop and improve safety analysis methods, models, and tools.
• Prepare and technically review calculation packages, safety analysis reports, and regulatory documentation.
• Work with regulatory and safety teams to establish safety requirements and support technical submissions.

Required qualifications

• Bachelor's degree in nuclear engineering, mechanical engineering, or a related technical discipline from an accredited institution.
• 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.
• Demonstrated 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.

Nice to have

• 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.

Benefits

• 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.
• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees.
• Daily catered lunch.
• Free snacks and drinks.
• Flexible PTO policy.

Before you apply

• Any job offer made will be contingent upon the applicant's capacity to serve in compliance with U.S. export controls.

About the company

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force.