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Radiant is building the world's first mass-produced, portable nuclear microreactors. The company's flagship product, Kaleidos, is a 1-megawatt, fail-safe microreactor designed for rapid deployment to hospitals, data centers, remote sites, and military bases. It can run for up to 5 years without refueling and uses existing, well-qualified materials combined with modern software engineering practices.
As Nuclear Engineer, Sensors, you will own the sensor and instrumentation solutions for the Kaleidos microreactor. This is a hands-on technical role with significant ownership and strategic influence in a fast-paced startup environment.
Key Responsibilities:
- Design, specify, and qualify in-core and ex-core detector systems (fission chambers, ion chambers, and other detector technologies) for neutron flux and radiation monitoring.
- Support detector response modeling and verification using radiation transport codes (MCNP, OpenMC, Serpent) to ensure sensor designs meet performance requirements.
- Evaluate and validate sensor survivability and performance under high-temperature, high-radiation, and accident-condition environments.
- Partner with reactor control and data acquisition (DAQ) engineers to integrate sensor outputs into reactor monitoring, protection, and control systems.
- Support verification and validation of instrumentation against customer and regulatory requirements.
- Collect requirements and provide expertise and feedback to engineers across functional areas via clear, constructive communication.
- Execute other nuclear instrumentation and sensor design/analysis duties as assigned.
The ideal candidate is passionate about advanced reactor design, detail-oriented, communicates effectively, and has tenacity to solve interesting technical challenges. You will work 100% onsite at the El Segundo headquarters and must be willing to work extended hours and weekends as necessary.
Radiant was founded in 2020 and is on track to test its first reactor at Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.
REQUIREMENTS:
- Bachelor's degree in nuclear engineering or equivalent from an accredited institution.
- 1–2+ years of nuclear engineering industry experience (Master's degree equivalent to 2 years), with exposure to radiation detection or instrumentation.
- Experience with radiation transport methods, including codes such as MCNP, OpenMC, or Serpent.
- Proficiency in at least one programming language: Python, C++, C#, FORTRAN, or another scientific computing language.
- Basic knowledge of thermal hydraulic principles.
- Self-motivated with strong organizational, written, and oral communication skills.
- Experience working in an engineering organization and developing high-quality work.
DESIRED QUALIFICATIONS:
- Hands-on experience designing, testing, or qualifying sensors/instrumentation in harsh environments (high temperature, high radiation).
- Experience with data acquisition (DAQ) systems and integration with reactor control systems.
- Experience with variance reduction techniques and associated software (Attila4MC and/or ADVANTG).
- Competency in distributed software development processes and high-performance computing environments.
- Familiarity with CAD design software (NX, SolidWorks, SpaceClaim).
- Familiarity with dose consequence methods and software such as MAACS or NRC-RADTRAN.
- At least 1 year of software development or scripting experience.
- Hands-on experience designing hardware and/or performing tests.
