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Reactor Engineer

Constellation
Marseilles, IL Full Time
POSTED ON 4/14/2026
AVAILABLE BEFORE 5/16/2026
Who We Are

As the largest private-sector power producer in the world and the nation's largest producer of clean and reliable energy, Constellation is focused on our purpose: lighting the way to a brilliant tomorrow for all. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute. Now integrated with Calpine, our portfolio includes 55 gigawatts of capacity from nuclear, natural gas, geothermal, hydro, wind and solar facilities, with the generating capacity to power the equivalent of 27 million homes.

The Reactor Engineer position is based out of our LaSalle County Generating Station in Marseilles, IL.

Our culture and employee experience make it clear: We are powered by passion and purpose. Together, we're creating healthier communities and a cleaner planet, and our people are the driving force behind our success. At Constellation, you can build a fulfilling career with opportunities to learn, grow and make an impact. By doing our best work and meeting new challenges, we can accomplish great things. Join us in meeting the country's energy needs today and tomorrow.

Total Rewards

Constellation offers an extensive selection of benefits and rewards to help our employees thrive professionally and personally. We provide competitive compensation and a wide-range of benefits that support both employees and their families, helping them prepare for the future. In addition to highly competitive salaries, eligible employees are offered a bonus program, 401(k) with company match, employee stock purchase program; comprehensive medical, dental and vision benefits, including robust wellbeing programs; disability and life insurance benefits; paid time off for vacation, holidays, and sick days; and much more.

Expected salary range of $79,200 to $88,000, varies based on experience, along with comprehensive benefits package that includes bonus and 401(k).

  • This Engineering role can be filled at Entry-level or Mid-level. Please see minimum qualifications list below for each level***********************************

Entry Level - $87,000

Mid Level - $97,200-$108,000

Ranges are per year based on experience, along with a comprehensive benefits package that includes bonus and 401K

Primary Purpose Of Position

Responsible for performing engineering and technical tasks, under direct supervision, in support of nuclear plant operations.

Primary Duties And Accountabilities

  • Assure all engineering analysis & recommendations prepared are in accordance with applicable safety analyses, industry codes, and all regulatory requirements.
  • Perform reactor engineering and technical tasks as assigned by supervision.
  • Support reactor engineering work functions.
  • Must obtain Qualified Nuclear Engineering (QNE) within 24 months of assuming the position.
  • All other job assignments and/or duties pursuant to company policy or as directed by management to include but not limited to: (Emergency Response duties and/or coverage, Department duty coverage and/or call out, and positions outside of department in support of outage activities etc.)

Minimum Qualifications - Entry Level

  • Bachelor's degree in Engineering (Chemical, Civil/Structural, Electrical, Industrial, Mechanical or Nuclear)
  • Maintain minimum access requirement or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties
  • The requirements as outlined above meet or exceed ANSI/ANS-3.1-2014 (4.6.1) Standard, "Selection, Qualification, and Training of Personnel for Nuclear Power Plants

Minimum Qualifications - Mid Level

  • Bachelor's degree in Engineering (Chemical, Civil/Structural, Electrical, Industrial, Mechanical or Nuclear) and 2 years of related experience (e.g. nuclear, science discipline)
  • Maintain minimum access requirement or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties
  • The requirements as outlined above meet or exceed ANSI/ANS-3.1-2014 (4.6.1) Standard, "Selection, Qualification, and Training of Personnel for Nuclear Power Plants"

Preferred Qualifications

Bachelor's degree in Nuclear Engineering

Engineering in Training certification

Salary : $79,200 - $88,000

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