Intern - Nuclear Engineer - Summer 2027

Commonwealth Fusion Systems•Devens, MA

2d•Onsite

About The Position

Commonwealth Fusion Systems is seeking a Nuclear Engineering Intern to contribute to nuclear engineering projects supporting fusion energy development. The internship lasts 13–18 weeks and requires 40–50 hours per week. Opportunities are available on site in Devens, Massachusetts; interns working on site are responsible for their own transportation and housing. Project assignments and required technical skills vary according to team needs. The program is open to currently enrolled college students at all levels from bachelor’s through PhD, and interns must be authorized to work in the United States for any employer. The intern will collaborate with Nuclear Engineering team members on neutronics analyses and calculations—including heating, activation, flux, and dose—to support the design and operation of SPARC, the scoping of ARC, and other nuclear engineering work. Projects may include energy-deposition analyses for delicate materials, shielding-sensitivity studies for diagnostic design, and computational development of methods and workflows for optimizing neutronics analyses. Compensation is based on year in school: $25–$32 per hour for bachelor’s interns and $35–$38 per hour for MS/PhD interns. The role may involve travel, occasional nights, weekends, or on-call work. It requires extended periods of typing, standing, or sitting and a commitment to safety in an industrial environment that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics. Full-time interns are offered 40 hours of sick time, health, dental, and vision insurance, a 401(k) with employer matching (enrollment requires being at least 21), professional growth opportunities, and team-building activities. Employment offers are contingent on compliance with U.S. Export Control Laws.

Requirements

Be pursuing an engineering degree focused on Nuclear Engineering.
Have completed a Neutron Transport, Neutronics, or Reactor Theory course by the start of the internship.
Have experience with MCNP or OpenMC.
Have strong communication skills and willingness to learn.
Work well in a team.
Be highly self-motivated and driven to execute quickly, with excellent troubleshooting and problem-solving skills.
Be authorized to work in the United States for any employer.
Be willing to travel or occasionally work nights, weekends, or on-call.
Be able to perform activities such as typing, standing, or sitting for extended periods.
Demonstrate dedication to safety in an industrial environment.

Nice To Haves

Experience in CAD.
Experience in Python or C++.
Experience with neutronics methods, including Monte Carlo or deterministic methods.

Responsibilities

Perform neutronics analyses, such as energy-deposition analyses for delicate materials and shielding-sensitivity studies for diagnostic design.
Collaborate with Nuclear Engineering team engineers on neutronics calculations, including heating, activation, flux, and dose.
Support the design and operation of SPARC, the scoping of ARC, and other nuclear engineering work.
Contribute to computational methods and workflows used to support and optimize different types of neutronics analyses.
Follow safety practices to mitigate industrial hazards.