Intern NRad & NuclearSystems Engineer Summer 2027

About Commonwealth Fusion Systems:

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research top talent and new technologies were designing and building commercially viable fusion power plants. And were working with policymakers suppliers and many others to build the energy industry of the future.

Were in the best position to make it happen. Since 2018 weve raised $4 billion of capital making us the largest and leading fusion company in the world.

Now were looking for more thinkers doers builders and makers to join us. People wholl bring new perspectives solve tough problems and thrive as part of a team.

If thats you and this role fits we want to hear from you.

Join the power movement as a NRad or Nuclear/Systems Engineering Intern

We are looking for talented NRad and Nuclear/Systems Engineering Interns 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 teams existing need.
• Opportunities available for currently enrolled college students in all levels of schooling from bachelors degree to PhD
• Interns must be authorized to work in the United States for any employer

What youll do:

The NRad intern

• 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
• 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
• Contribute to the computational development of method and workflows needed to support and optimize different types of neutronics analyses

The Nuclear/Systems Engineering Intern

• Support the interface of Nuclear Engineering and Systems Engineering working collaboratively with both teams on neutronics analyses and their application to the development of system design
• Work on projects such as but not limited to: participating in Hazard Identification reviews and evaluation of accident scenarios development and verification of radiation related system requirements and margin budget development tracking and support.

What were looking for:

• Pursuing an engineering degree with focus in the fields Nuclear Engineering or Mechanical Engineering
• Neutron Transport or Neutronics or a Reactor Theory course completed by the start of internship
• Experienced in MCNP or OpenMC
• Experience in Mechanical Design throughcourses previous internships or classprojects
• Strong communication skills and awillingness to learn
• Must work well in a team
• Must be highly self-motivated and driven toexecute quickly with excellenttroubleshooting/problem-solving skills
• Prior hands-on experience or internshipsworking in a commercial/research fissionplant environment or the naval nuclearpower program
• Optional: experienced in CAD and/or Python/ C

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

$25 - $38 an hour

Rates are aligned to your current year in school ensuring equitable and consistent pay across our intern program.

For BS interns the hourly rate is $25$32

F or MS/PhD interns the rate is $35$38

Benefits included for full-time interns:

40 hours of sick time

Health dental and vision insurance

401(k) with employer matching (must be 21 years of age to enroll)

Professional growth opportunities

Team-building activities

#LI-Onsite

At CFS we excel in fast-paced environments driven by our values of integrity execution impact and self-critique. As we grow were eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally regardless of race color national origin ancestry citizenship status protected veteran status religion physical or mental disability marital status sex sexual orientation gender identity or expression age or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively Export Control Laws). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

Required Experience:

Intern