Senior Mechanical Engineer

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? Apply today!Job DescriptionThe Facility Commissioning and Turnover (FCAT) unit provides commissioning oversight and turnover assurance, ensuring that all building systems and equipment delivered for the Spent Fuel Handling Recapitalization Project (SFHP) meet the Owner's Project Requirements and are ready for operational acceptance. In this role, you will serve as mechanical commissioning oversight for HVAC, exhaust systems, heat recovery units, life safety mechanical systems, and other facility mechanical equipment. You will review scripts, Pre Test Checklists (PTCs), mechanical test procedures, and installation quality, ensuring mechanical systems meet design requirements and are ready for turnover. Responsibilities include supporting walkdowns with end-users, validating redline drawing accuracy, resolving vendor related issues, integrating mechanical commissioning activities into integrated construction schedule, and coordinating training and testing logistics.Required Combination of Knowledge and SkillBachelors 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 SkillsExperience with HVAC, mechanical equipment installation, and fluid/thermal systemsFacility commissioning experienceStrong coordination and communication skillsAbility to interpret mechanical drawings, redlines, and specificationsCompensation and BenefitsHealth, Dental, Vision & Voluntary BenefitsDisability, Life & Accident Insurance401(k) Savings program & Capital Accumulation PlanPersonal & Medical Time OffPaid Parental LeaveFlexible Work SchedulesTuition Assistance for Eligible EmployeesStudent Debt Benefit Personal Time Off Sell ProgramEmployee Assistance Program (EAP)Wellness ProgramVisit us online to view all NNL benefits!Pay Range$95,700.00 - $149,600.00 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, satellite, and vendor locations.For more than 75 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.Requisition ID8982- Posted10/08/2026-Energy Drive-Engineering & Science-4 - 6 Years-0-25%-Job location (country) (1)United StatesJob location (region) (1)Idaho Falls, ID