Navy
ENGINEERING

Rating

MMN

Machinist's Mate, Nuclear Power

Description

Machinist's Mates, Nuclear Power (MMN) operate and maintain Naval Nuclear propulsion plants and associated equipment; supervise and administer Naval nuclear propulsion plant operations; apply reactor, electrical, and mechanical theory involved in the operation of the nuclear reactor, steam plant, propulsion plant, and auxiliary equipment; operate and repair systems associated with reactor plants, propulsion plants, and auxiliary support systems (air compressors, freshwater production plants, steam turbines, shaft line components, air conditioning equipment, feed and condensate, steam, hydraulic, seawater systems, air, potable water, lubricating oil and oil purification, reactor auxiliary and support systems pumps, valves, and heat exchangers); perform tests, transfers, and inventories of lubricating oils, fuels, and water; and maintain records and reports on both submarine and surface ships.

Core Skills

  • nuclear power plant operations
  • mechanical and electrical systems troubleshooting
  • reactor and steam plant monitoring
  • preventive and corrective maintenance
  • technical procedure compliance
  • system diagnostics and fault isolation
  • technical documentation and log keeping
  • safety and regulatory compliance
  • root cause analysis
  • team coordination in high-risk environments
  • time-critical decision making
  • technical training and mentoring
  • reading and interpreting technical drawings
  • condition-based maintenance practices
  • basic data analysis for performance trending

Common Certifications

  • Engineer-in-Training (EIT) / Fundamentals of Engineering (FE)
  • Professional Engineer (PE) license pathway
  • OSHA 30-Hour General Industry Safety
  • Stationary Engineer License
  • Nuclear Operator License (NRC)
  • Boiler Operator License

Civilian Career Paths

  • MECHANICAL ENGINEERING
  • ELECTRICAL ENGINEERING
  • FACILITIES MANAGEMENT
  • PROJECT MANAGEMENT

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Data sourced from official Navy publications and public military occupational references. Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.