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Salary
$50k – $76k per year
Location
In office (Devens)
Seniority
Intern
Employment
Internship

Confirmed on the employer's own hiring board on Oct 26, 2026. First seen by Alion on Oct 15, 2026. Commonwealth Fusion Systems scores B on the Alion truth index.

Overview
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Commonwealth Fusion Systems is a commercial fusion energy company headquartered in Devens, Massachusetts, and founded in 2018. The firm specializes in the development of high-temperature superconducting magnets and compact tokamak devices, specifically the SPARC net-energy machine and the ARC commercial power plant. It operates through a strategic partnership with the Massachusetts Institute of Technology and focuses on scaling fusion technology to provide carbon-free, baseload power to global energy markets.

Join the power movement as a Nuclear Engineering Intern

We are looking for a talented Nuclear Engineering Intern to join our team! CFS interns are highly valued within the organization and placed into meaningful and challenging roles.

Program Details:

  • 13-18 week internship
  • 40-50 hours per week with set hourly salary based on year in school
  • Opportunities on site in Devens, MA. If an intern is going to be on site, you will be responsible for your own transportation and housing
  • Specific project assignments and required technical skillset will vary based on the team’s existing need.
  • Opportunities available for currently enrolled college students in all levels of schooling from bachelor’s degree to PhD
  • Interns must be authorized to work in the United States for any employer

What you'll do:

  • The intern will work on projects such as, but not be limited to: Neutronics analyses such as energy deposition in delicate materials or shielding sensitivity studies for diagnostic design
  • They will collaborate with engineers on the Nuclear Engineering team to do neutronics calculations (heating, activation, flux, dose, etc) to support the design and operation of SPARC, the scoping of ARC, and any other nuclear engineering needed
  • They will have opportunities to contribute to the computational development of method and workflows needed to support and optimize different types of neutronics analyses

What we’re looking for:

    • Pursuing an engineering degree with focus in the field of Nuclear Engineering - required
    • Have complete by the start of their internship Neutron Transport or Neutronics or a Reactor Theory course
    • Experienced in MCNP or OpenMC
    • Strong communication skills and a willingness to learn
    • Must work well in a team
    • Must be highly self-motivated and driven to execute quickly with excellent troubleshooting/problem-solving skills
    • Optional: experienced in CAD and/or Python / C++, Neutronics Methods (Monte Carlo or Deterministic)

Must-have Requirements:

  • Willingness to travel or work required nights/weekends/on-call occasionally
  • Perform activities such as typing, standing, or sitting for extended periods of time
  • Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
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