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Advanced Reactor Mechanical Engineer

Battelle Energy Alliance
United States, Idaho, Idaho Falls
2525 Fremont Avenue (Show on map)
Feb 12, 2026

As a Mechanical Engineer in the Reactor Project Engineering department at Idaho National Laboratory, you'll shape the future of national energy supply by performing mechanical design and analysis of advanced nuclear reactors and associated systems. You'll collaborate with world-class scientists and engineers to develop designs that enable advanced nuclear reactor projects such as the Molten Chloride Reactor Experiment and National Reactor Innovation Center projects. This position is located at our Materials and Fuels Complex, which hosts the core of the U.S. nuclear research and development capabilities with a diverse array of nuclear facilities and reactor experiment test beds. In this role you will collaborate with multiple organizations within INL and external reactor developer partners. Our team works a 4x10 schedule with every Friday off.

Essential Job Functions:

  • Design and analyze mechanical systems to meet requirements in accordance with project documentation and relevant codes and standards for advanced nuclear reactors and associated facilities and systems.
  • Review and determine adequacy of mechanical designs prepared by external organizations
  • Decompose project goals into defined and controlled design requirements.
  • Use best practices in design methodologies to develop and validate designs.
  • Develop physics-based mathematical models of mechanical systems.
  • Apply national consensus codes and standards.
  • Document designs to establish conformance with requirements and standards.
  • Establish testing, inspection, and quality requirements.
  • Provide oversight of mechanical system fabrication, installation, and construction using applicable field experience.
  • Develop mechanical system requirements, perform designs, and support fabrication, inspection, assembly, and testing.
  • Develop systems/equipment performance calculations and develop appropriate design specifications.
  • Monitor and evaluate plant systems, recommend maintenance and repair standards, and identify vendor data and spare parts.
  • Support and lead new project development, including proposals and business plans.
  • Ensure design modifications meet technical baseline requirements and applicable codes.
  • Maintain configuration management of the technical baseline and assigned systems.
  • Mentor and train junior engineering staff.
  • Other duties as assigned.

Knowledge, Skills, and Abilities:

  • Knowledge of design techniques, tools, and principles for technical plans, blueprints, drawings, and models.
  • Knowledge of national consensus codes and standards relevant to assigned scope.
  • Practical application of engineering science and technology.
  • Ability to apply general rules to specific problems.
  • Ability to combine information to form general rules or conclusions.
  • Effective listening and verbal communication skills.
  • Ability to recognize when something is wrong or likely to go wrong.

Required:

  • Level 1: Bachelor's in engineering or mechanical engineering or other related field from an ABET accredited institution and 0 years' experience.
  • Level 2: Bachelor's in engineering or mechanical engineering or other related field from an ABET accredited institution and 2 years of experience. Master's and 0 years of experience. PhD and 0 years of experience.
  • This position requires the ability to obtain and maintain a Department of Energy "Q" clearance, which requires US Citizenship.

The ideal candidate will possess:

  • Advanced degree in mechanical engineering or a directly related engineering field from an ABET-accredited institution.

Job Information:

  • The pay range for this position is: Level 1 ($66,504 - $136,356)/ Level 2 ($79,344 - $162,732). At Idaho National Laboratory compensation decisions are determined using factors such as education, relevant experience, and other credentials.
  • TDP: This is a testing designated position; you will be required to submit to a pre-employment drug screen and periodic drug testing throughout the term of your employment.
  • Multi-Level: This is a multi-level posting and you will be placed at the appropriate level dependent on depth and breadth of proven experience and skills.

Physical Requirements:

While performing the duties of this classification, the employee is frequently required to stand, walk, sit, stoop, kneel, bend, and work in an office and field/laboratory environment. The job requires hand/finger dexterity to keyboard or type, handle materials, manipulate tools, and reach with hands and arms. The job requires operation of job-related equipment and driving a vehicle. The employee must occasionally lift and/or move up to 35 pounds without assistance. Sufficient visual acuity and hearing capacity to perform the essential functions and interact with the public is required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

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