Radiant

Portable nuclear microreactors for clean energy.

radiantnuclear.com

HQ: El Segundo, CA, USA

Energy

Company research

Public company, workplace, funding, and market signals

Updated Aug 16, 2026

Overview

Radiant is an advanced nuclear company building portable, mass-produced microreactors. Its first product, Kaleidos, is a 1 MW failsafe transportable microreactor intended to replace diesel generators and provide resilient power for remote sites, military bases, hospitals, and data centers.

Primary product

Kaleidos portable nuclear microreactor

Founded

2020

Headquarters

El Segundo, California, United States

Team size

51-200

Industry

Nuclear Electric Power Generation

Sub-industry

Advanced nuclear microreactors

Offices

El Segundo, California, United States

Oak Ridge, Tennessee, United States

Business model

B2B hardware

government/defense contracting

energy infrastructure

Funding

Stage

Series D

Total raised

$622.6M

Latest round

Series D · Dec 2025

Latest amount

$300M

Strategic investment from Lockheed Martin Ventures

Feb 2026 · Lockheed Martin Ventures

Strategic investment / oversubscribed round

Dec 2025 · Draper Associates and Boost VC

$300M

Series C close

May 2025 · DCVC

$165M

Series C

Nov 2024 · DCVC

$100M

Series B

Apr 2023 · Andreessen Horowitz

$40M

Government awards / SBIR / DOE support

Jan 2023

$2.3M

Series A

Jan 2022 · Union Square Ventures

$11M

Angel / seed (reported in company timeline)

Jan 2020

$1.8M

People & investors

Leadership

Doug Bernauer

Co-founder & CEO

Tori Shivanandan

Chief Operating Officer

Rachel Slaybaugh

Investor Board Member, Compensation Committee Member

Benjamin Betzler

Head of Nuclear Engineering

Tatevik Garibyan

Director of People Operations

Alex Garrison

Senior Director, Reactor Engineering

Peter Hadjisavas

VP of IT

Travis Leung

Director, Facilities

Matt Wilson

Vice President

Charles Palella

Senior Director, Supply Chain Management

Nami Peymani

Director Electrical Systems

Sarah Glidden

Early Career Recruiting & Programs Lead

Founders

Bob Urberger

Co-founder & Chief Technology Officer

Rita Baranwal

Chief Nuclear Officer

Investors

Work & culture

Public messaging emphasizes mission-driven engineering, commercialization, safety, resilience, and national-security relevance. Hiring and posts suggest a technically heavy, fast-moving team focused on advanced nuclear hardware and operations.

Product & market

Pricing

Not publicly disclosed; likely enterprise/government project-based sales for reactors, testing, and deployment agreements.

Differentiators

—Portable, truck-transportable microreactor design
—1 MW class failsafe microreactor
—Factory assembly/fueling and on-site deployment model
—Uses air cooling and no on-site water use
—First mover in DOME testing among private microreactor developers
—Defense and DOE validation via selection for DOME and ANPI/Buckley

Technology

gitlab

tableau

graphql

boolean

etap

spaceclaim

github actions

git

netsuite

javascript

siemens

apache

docker

react

cloudflare

fortran

ansys fluent

nginx

unix

dbt

Customers

U.S. Department of the Air Force / Buckley Space Force Base

Idaho National Laboratory / NRIC / DOE (test-bed and development partners)

hospitals

datacenters

military installations

remote/off-grid sites

Competitors

Westinghouse eVinci

Antares

NANO Nuclear

First American Nuclear

other microreactor developers

Scale & contact

Estimated monthly visits

26K

Traffic estimate as of Jun 2026

Latest news

DOE Selects Radiant for Second HALEU Allocation to Support First Commercial Microreactor at a U.S. Military Installation

Business Wire / Morningstar · Jul 2026

DOE conditionally selected Radiant for a second HALEU allocation tied to its planned Buckley Space Force Base deployment, advancing the commercial microreactor program.

Energy Department to Distribute Third Round of HALEU to NASA and Radiant

U.S. Department of Energy · Jul 2026

DOE made conditional commitments to provide HALEU to NASA and Radiant; the Radiant allocation supports a microreactor deployment to Buckley Space Force Base and marks a second selection for Radiant.

DOME, world’s first nuclear reactor test bed, ready for privately developed advanced reactors

Idaho National Laboratory · Jul 2026

INL announced DOME is open and that Radiant’s Kaleidos demonstration unit plans to start a year-long testing program this spring.

Air Force selects Radiant to deliver microreactors to Buckley Space Force Base

Radiant Nuclear · Apr 2026

Radiant said the Department of the Air Force selected it to develop and operate a microreactor for Buckley Space Force Base, with delivery targeted for 2028.

Radiant adds Lockheed Martin as strategic investor to oversubscribed funding round

Radiant Nuclear · Feb 2026

Radiant announced a strategic investment from Lockheed Martin Ventures into its current financing round.

About Blog / news Careers DOE DOME page Homepage Homepage Idaho Strategic MOU Lockheed Martin strategic investment NRIC DOME demonstrators Series B announcement

SourcesRadiant homepage / company profile via Exa Series B funding announcement Series C announcement Series C close Radiant funding / investor posts Lockheed Martin strategic investment DOE HALEU allocation announcement DOE DOME page

Jobs and careers at Radiant

98 jobs at Radiant

2027 New Graduate - Thermal Engineer

On-site

Engineering

El Segundo, CA; El Segundo, California, United States

2d ago

On-site

Full-time