Machinist's Mate Nuclear(MMN Navy Rating)

Nuclear-qualified Machinist's Mate (MMN) serving in an operator (O) or supervisor (S) role on the N25 Naval Reactors plant type. Earned through Naval Nuclear Power School (NNPS), Nuclear Power Training Unit (NPTU) qualification, and plant-specific qualification. See NAVPERS 18068F Vol II.

Nuclear-qualified Machinist's Mate (MMN) serving in an operator (O) or supervisor (S) role on the N26 Naval Reactors plant type. Earned through Naval Nuclear Power School (NNPS), Nuclear Power Training Unit (NPTU) qualification, and plant-specific qualification. See NAVPERS 18068F Vol II.

Performs emergency weld repairs on propulsion plant piping and components.

Identifies personnel who have been disqualified from serving in nuclear propulsion plants and are still in the process of converting to another rating.

Operates and performs organizational level maintenance on mechanical systems for submarine nuclear propulsion plants.

Performs radiological controls and water chemistry control functions and associated analyses in addition to operating and performing organizational level maintenance on mechanical systems for submarine nuclear propulsion plants.

Operates and performs organizational level maintenance on mechanical systems for surface ship nuclear propulsion plants.

Performs radiological controls and water chemistry control functions and associated analysis in addition to operating and performing organization level maintenance on surface ship nuclear propulsion plants.

Responsible for the oversight of nuclear operations, maintenance, and nuclear trained personnel onboard submarines and aircraft carriers. Directs and reviews all levels of nuclear operations and maintenance; and manages the training, qualifications, proficiency, and professional development of all nuclear trained personnel assigned.

Is the senior enlisted advisor to the respective command advising on proper administration and supervision of a nuclear propulsion plant. The RDMC assists the Reactor Officer in administering enlisted personnel, designating enlisted watch assignments, monitoring the qualification program of all nuclear trained operators, and acts as a liaison for the Reactor Department at the CPO level.

Is the senior enlisted advisor to the respective command advising on proper administration and supervision of a nuclear propulsion plant. The EDMC assists the Engineering Officer in administering enlisted personnel, designating enlisted watch assignments, monitoring the qualification program of all nuclear trained operators, and acts as a liaison for the Engineering Department at the CPO level.

Validates that nuclear-trained submarine/Nuclear Power Training Unit (NPTU) Sailors have completed the Engineering Watch Supervisor or surface Sailors have completed the Propulsion Plant Watch Supervisor qualification.

Qualified to perform radiological controls and water chemistry control functions and associated analyses; additionally, operates and performs organizational level maintenance on mechanical systems for submarine nuclear propulsion plants.

Submarine nuclear propulsion operator assigned to duties not associated with the supervision, operation or maintenance of naval nuclear propulsion plants.

Provides basic and in-depth administration and maintenance of shipboard propulsion plant Local Area Network (LAN). Manages and maintains internal site networks to include but not limited to Active Directory management, server and database backup and administration, server and client administration. Conducts first-level network software and hardware troubleshooting and corrective actions.

Manages shipboard nuclear reactor plant network operating systems (e.g., Windows Server and clients) and infrastructure (i.e., cabling, throughput, connectivity, I/O devices, and topologies). Possesses thorough knowledge of current technology and trends. Implements a variety of protocols, services, and standards such as TCP/IP and Internet (http, ftp, telnet, smtp, snmp).

Supervises organizational and depot level radiological maintenance on Naval Nuclear Propulsion Plants and in nuclear capable repair activities.

Researches and writes organizational level nuclear propulsion plant maintenance procedures.

Reflects knowledge, skills, and abilities for Fleet Maintenance Activity Nuclear Planners (FMANPs) not gained through any other source. Writes intermediate level nuclear repair Technical Work Documents (TWDs). Conducts detailed research, focusing on technical accuracy, required materials, developing sketches, radiological containment fabrication, work step flow, and post repair testing.

Performs radioactivity analysis with High Purity Germanium semi-conductor detectors, Sodium Iodide Scintillators, and Plastic Scintillators. Identifies and quantifies radioactivity from samples, system hardware, tools, and equipment to determine suitability for release from radioactive controls.

Surface ship nuclear propulsion operator assigned to duties not associated with the supervision, operation, or maintenance of a naval nuclear propulsion plant.

Supervises organizational level maintenance and conducts onboard maintenance training on conventional propulsion boilers, steam propulsion engines, forced draft blowers, associated machinery, ship service turbine generators (SSTG), steam plant controls/regulating components (less automatic boiler controls), supporting auxiliary equipment, valves and piping systems.

Performs preventive, organizational and/or intermediate level maintenance on submarine diesel engines and components including pumps, blowers, governors, injectors, cylinders, liners, pistons, connection rods, bearings, crankshaft, vertical drive assembly, lubrication oil, fuel oil, scavenging air, exhaust, starting air, and cooling water systems.

Starts, operates, performs organizational and/or intermediate level maintenance and overhauls all types of refrigeration, cooling and air conditioning equipment utilizing centrifugal or reciprocating compressors, including accessories and controls. Identifies abnormal conditions and corrects malfunctions that may lead to inadequate refrigeration, cooling or air conditioning.

Performs intermediate and organizational level maintenance on marine propulsion boilers. Reviews and maintains records and reports pertinent to boiler repair.

Stands watch on Automatic Boiler Control Console, identifies abnormal in-plant conditions that lead to emergencies and/or casualties, and initiates corrective or emergency actions/procedures when such conditions arise.

Performs organizational level maintenance on electronic automatic boiler controls systems, steam plant control systems (chameleon), boiler combustion monitoring systems, boiler ignitor system. Maintenance includes preventive and corrective maintenance, troubleshooting, calibration, and testing on system and subsystem components.

Provides haircuts that conform to Navy grooming standards; maintains barber equipment; meets sanitation requirements.

Performs NAMTS operational and intermediate level maintenance procedures in inspecting, troubleshooting, repairing, maintaining and testing submarine valve systems and components. Demonstrates knowledge of operational and intermediate level repair procedures, repair and maintenance standards, quality assurance specifications and proper use of industrial machinery.

Performs Navy Afloat Maintenance Training Strategy (NAMTS) operational and intermediate level maintenance procedures in inspecting, troubleshooting, repairing, maintaining and testing submarine pump systems and components.

Member has been disqualified from serving on submarine duty and is still in the process of converting to another Source Rating. Once the conversion process is complete, this NEC code shall be achieved.

Qualified as a worker at an IMA Nuclear Repair work center (Shop 38N) or Nuclear Power Training Unit (NPTU) Maintenance Training Group (MTG).

Performs NAMTS operational and intermediate level maintenance procedures in inspecting, troubleshooting, repairing, maintaining and testing submarine compressors, heat exchangers and refrigeration systems as well as recharging systems and aligning equipment shafts.

Performs NAMTS operational and intermediate level maintenance procedures in inspecting, troubleshooting, repairing, maintaining and testing submarine hydraulics systems and components. Demonstrates knowledge of operational and intermediate level repair procedures, repair and maintenance standards, quality assurance specifications and proper use of industrial machinery.