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Mechanical Design Engineer: Reactor Internals & Shielding

Job in Rockville, Montgomery County, Maryland, 20849, USA
Listing for: X-energy
Full Time position
Listed on 2026-07-23
Job specializations:
  • Engineering
    Mechanical Engineer
Salary/Wage Range or Industry Benchmark: 115000 - 140000 USD Yearly USD 115000.00 140000.00 YEAR
Job Description & How to Apply Below

X-energy LLC seeks a Mechanical Design Engineer to design, analyze, and develop in-core shielding elements and reactor internals for X-energy's high-temperature gas-cooled reactor. You’ll support from concept through detailed design, with emphasis on nuclear safety, quality, and regulatory compliance.

The role involves performing structural, thermal, and hydraulic analyses, developing CAD models, and validating designs in collaboration with systems engineers and suppliers.

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