---
title: 'Senior Safety Analysis Engineer at Radiant Industries'
canonical: 'https://feeny.ai/job/senior-safety-analysis-engineer-radiant-industries-el-segundo-ke71y76kzdt1'
type: 'job'
last_seen: '2026-10-19'
---

# Senior Safety Analysis Engineer at Radiant Industries

- **Company:** [Radiant Industries](https://feeny.ai/companies/radiant-industries)
- **Location:** El Segundo, CA
- **Compensation:** $150k–$212k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-10-15
- **Last confirmed live:** 2026-10-19
- **Apply:** https://jobs.ashbyhq.com/radiant-industries/dc624e50-ab7a-42b9-9bc6-2ef277b21ed0

## Job description

## About Radiant

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.

## About the Role

Radiant is seeking a Senior Safety Analysis Engineer to lead reactor safety analyses supporting the design, testing, and deployment of Kaleidos. You will evaluate reactor behavior during normal, transient, and accident conditions, assess safety margins, and develop technically defensible analyses that inform reactor design decisions and regulatory evaluations. This role combines reactor systems and thermal-hydraulic analysis with fuel performance, source term development, and radiological consequence assessments. You will own complex analytical work from methodology development and model execution through uncertainty evaluation, technical review, and documentation, working closely with nuclear design, thermal, mechanical, materials, testing, and regulatory teams. The ideal candidate brings strong reactor safety fundamentals, hands-on modeling experience, and sound engineering judgment. You should be comfortable identifying dominant physical phenomena, evaluating analytical uncertainties, and translating complex results into practical design and safety decisions.

## Responsibilities & Duties

- Lead deterministic reactor safety analyses covering 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 impact on safety conclusions.
- Apply 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.

Required Qualifications & Skills

- 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.

## Preferred Qualifications & Skills

- 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.

Additional Requirements

- Must be mission driven and willing to support extended hours when needed.
- Must work 100% onsite at Radiant's El Segundo headquarters.

## 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: recruiting@radiantnuclear.com.

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. 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.

## About Radiant Industries

## Company Overview
- **One-liner**: Radiant Industries is building the world’s first mass‑produced, portable nuclear microreactor (Kaleidos) to replace diesel generators with zero‑emission, resilient power for remote sites, hospitals, data centers, and military installations.
- **Entity Type**: Private (Series D – $300M raised in December 2025, led by Lockheed Martin Ventures)
- **Headquarters**: El Segundo, California, USA
- **Founded**: 2020 (some sources list 2019)
- **Founders**: Not publicly disclosed

## Core Business
- **Primary industry**: Nuclear electric power generation / clean energy
- **Target customers**: B2B – remote communities, hospitals, data centers, military bases, industrial sites that currently rely on diesel generators or unstable grids
- **Mission**: To bring one of the world’s first factory‑constructed microreactors to market, providing portable, zero‑emissions power anywhere, anytime.

## Products & Services
- **[Kaleidos Microreactor](https://www.radiantnuclear.com/)**: A 1 MW electric / 1.9 MW thermal portable nuclear reactor packaged in a shipping container. It uses helium gas cooling and TRISO fuel (meltdown‑proof ceramic uranium particles). Delivered by truck or aircraft, installed without site excavation, and can reach full power the next day. After 5+ years the entire container is returned to the factory for refueling; up to four fuel cycles yield a 20‑year product lifetime. Customers purchase via Power Purchase Agreements (PPAs) or direct unit sales.

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Key Metric**: Total funding raised – **$622.6M** (as of early 2026)
- **Notable Investors/Partners**: Andreessen Horowitz (led Series B), Lockheed Martin Ventures (led Series D), plus 18+ other investors across Series B, C, and D rounds
- **Growth Signals**:
  - Headcount grew **141% YoY** to 157 employees (as of mid‑2026)
  - 64 active job postings (+178% YoY)
  - Plans to test its development reactor in **2026** – which would be the first new commercial reactor design to achieve a fueled test in over 50 years
  - Initial customer deployments targeted for **2028**
  - SBIR Phase II awards from the U.S. Air Force for nuclear microreactor installation energy resilience

## Competitive Advantages
- **Portability & speed**: Delivered in a standard shipping container, installed in one day, no on‑site water or excavation needed.
- **Passive safety**: TRISO fuel is meltdown‑proof; the core is cooled by natural convection (air jacket) without pumps.
- **Factory‑built, factory‑refueled**: No nuclear waste or infrastructure left on site after the container is returned.
- **High energy density**: Over 110× the energy density of existing diesel systems.
- **Fleet monitoring**: Hundreds of units can be monitored 24/7 from a centralized control center.

## Strategic Focus
- Complete fueled testing of the Kaleidos prototype in 2026.
- Secure regulatory approvals (special nuclear material license, Part 7 license).
- Scale manufacturing for initial customer deployments beginning in 2028.
- Expand into military, commercial, and humanitarian markets (disaster relief, remote microgrids, backup power).

## Why Work Here
- **Culture & mission**: High‑impact climate tech – directly replacing diesel generators with clean nuclear power. Rated 5.0/5.0 on employer reviews (5 reviews) with strong scores for culture (4.7) and career growth (4.8).
- **Work location**: On‑site in El Segundo, CA (steps from the Pacific Ocean, near downtown). Employees work from a physical office.
- **Perks**: Company equity, relocation assistance, free daily meals, commuter benefits, onsite parking, generous parental leave, family medical leave, onsite Mother’s Room, dental/health insurance, FSA.
- **Diversity & inclusion**: Mandated unconscious bias training; hiring practices that promote diversity.
- **Tech stack**: React, TypeScript, Python, C++, C#, Kubernetes, Docker, PostgreSQL, AWS, Ansys, SolidWorks, Altium, and more. Engineers work on cutting‑edge nuclear, mechanical, and embedded systems.
- **Growth trajectory**: 141% headcount growth in the past year; 64 open roles across engineering, regulatory, supply chain, and operations.

## Sources
1. [radiantnuclear.com](https://www.radiantnuclear.com/) – Product details, specs, deployment model
2. [builtin.com](https://builtin.com/company/radiant) – Company overview, perks, culture, tech stack, reviews
3. [linkedin.com](https://www.linkedin.com/company/r-a-d-i-a-n-t) – Funding, headcount, employee growth, locations, key executives
4. [sbir.gov](https://www.sbir.gov/portfolio/1655711) – SBIR awards, Phase II contracts with U.S. Air Force
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/radiant-industries) – Current open positions (64+)

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