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Senior Mechanical Engineer

Job in Idaho Falls, Bonneville County, Idaho, 83401, USA
Listing for: Naval Nuclear Laboratory (FMP)
Full Time position
Listed on 2026-08-29
Job specializations:
  • Engineering
    Mechanical Engineer, Systems Engineer
Salary/Wage Range or Industry Benchmark: 95700 USD Yearly USD 95700.00 YEAR
Job Description & How to Apply Below

Working at the Naval Nuclear Laboratory we foster pride in belonging to an organization whose culture is made up of these core values:
Trust, Empowerment, and Collaboration. Our company promotes a positive culture while ensuring the safety and reliability of our nation's naval nuclear reactors, and training the Sailors who operate those reactors in the U.S. Navy's submarines and aircraft carrier Fleets. Looking for a lifetime career?

Job Description

Our Production Systems Engineering unit is seeking an experienced Mechanical Engineer to support and lead the development, planning, and execution of radiological mechanical systems throughout their full life cycle. In this role, you’ll research, design, verify, and develop mechanical and electromechanical equipment and fluid systems, recommending improvements that enhance safety, performance, efficiency, and cost. You may work in specialized areas such as thermal hydraulics, propulsion plant systems, component design, modeling and simulation, shock and vibration, acoustics, or structural analysis.

Responsibilities include coordinating fabrication, installation, testing, operation, and maintenance activities, analyzing engineering problems using data-driven methods, applying engineering standards, and preparing or reviewing technical documentation for system installation and operations.

Required Combination Of Knowledge And Skill

Bachelors degree from an accredited college or university in a related technical, engineering or science field and a minimum of 6 years of relevant experience; or Masters degree from an accredited college or university in a related technical, engineering or science field and a minimum of 4 years of relevant experience; or Doctorate degree from an accredited college or university in a related technical, engineering or science field and a minimum of 1 year of relevant experience;

or Currently a Senior Reactor Training Engineer, Refueling Engineer, or Field (RPCO) Engineer at the Company.

Preferred Skills
  • Experience with ventilation, HVAC, compressed air systems, and pump design
  • Proven project management expertise
  • Demonstrated ability to work independently, showing self-reliance and strong motivation
Compensation And Benefits
  • Health, Dental, Vision & Voluntary Benefits
  • Disability, Life & Accident Insurance
  • 401(k) Savings program & Capital Accumulation Plan
  • Personal & Medical Time Off
  • Paid Parental Leave
  • Flexible Work Schedules
  • Tuition Assistance for Eligible Employees
  • Student Debt Benefit Personal Time Off Sell Program
  • Employee Assistance Program (EAP)
  • Wellness Program
  • Visit us online to view all NNL benefits!
Pay Range

$95,700.00 - $ annually
Salary information provided is a general guideline only. Annual salary is based upon candidate experience and qualifications, as well as market and business considerations.

The Naval Nuclear Laboratory is operated for the U.S. Department of Energy (DOE) by Fluor Marine Propulsion, LLC (FMP), a wholly owned subsidiary of Fluor Corporation. Naval Nuclear Laboratory personnel are FMP employees who work at four DOE facilities:
Bettis Atomic Power Laboratory, Knolls Atomic Power Laboratory, Kenneth

A. Kesselring Site, and Naval Reactors Facility, and at the U.S. Department of Defense-owned Nuclear Power Training Unit-Charleston. FMP employees also have an established presence at numerous shipyards and vendor locations. For nearly 70 years, the Naval Nuclear Laboratory has developed advanced nuclear propulsion technology, provided technical support, and trained world-class nuclear operators to ensure the safe and reliable operation of our nation's submarine and aircraft carrier Fleets.

The Naval Nuclear Laboratory is a national asset solely dedicated to the Naval Nuclear Propulsion Program. We rely on the dedication and innovation of our nearly 8000 engineers, scientists, technicians, and support personnel.

All candidates must be U.S. citizens. Applicants selected will be subject to a Federal background investigation and must meet eligibility requirements for access to classified matter. FMP is a government contractor and maintains a drug-free workplace and workforce. All candidates must be able to pass a drug test in compliance with FMP company policy and 10 CFR 707. Marijuana is a Federal Schedule I controlled substance and illegal under Federal Law.

Therefore, FMP is required to test for marijuana.

Fluor Marine Propulsion, LLC is an Equal Opportunity Employer, including disability/vets. All qualified applicants will receive consideration for employment without regard to race, color, age, sex, religion, national origin, disability, veteran status, genetic information, or any other criteria protected by federal, state, or local law.

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Position Requirements
10+ Years work experience
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