Navy Enlisted Job Descriptions & Qualifications
Machinist Mate (Nuclear Field) MMN
General Info: Nuclear-trained MMs, EMs and ETs perform duties in nuclear propulsion plants operating reactor control, propulsion and power generation systems. The character of NF jobs is mentally stimulating and offers career growth. The NF provides opportunities to work closely with specialists in the nuclear, technology, and engineering fields.
What They Do: The Navy is the leader in the development and safe operation of nuclear power plants and provides the most comprehensive technical education available in the NF. New and exciting career opportunities await the select group of people who possess nuclear knowledge and know-how, gained through Navy training.
ASVAB Score Requirements: VE+AR+MK+MC+NAPT>=290 AND NAPT>=50 or AR+MK+EI+GS+NAPT>OR=290 and AND NAPT>OR=50 or AR+MK+EI+GS>=252 or VE+AR+MK+MC>OR=252
Other Requirements: Must have normal color perception. Must have normal hearing. Security Clearance (SECRET) Requirement. 72 month obligation. Must be U.S. citizen.
Notes: All candidates for ratings in the nuclear field (NF) program must meet test score criteria (no waivers) and other criteria set forth in NAVMILPERSCOMINST 1306.11 (series). All candidates must be high school graduate (GED not acceptable), and have completed at least one year of algebra with a minimum grade of "C". Transcripts (or certified copy) must be filed in service record when enlisted. Minimum auditory requirements: Frequency (HZ) / ISO 500/30 1000/30 2000/30 3000/45 4000/60 5000-8000/None
High school diploma graduate or equivalent. Must be able to type 40 words per minute. Must have no record of conviction by civil court for any offense other than minor traffic.
Technical Training Information: Enlistees are taught the fundamentals of this rating through on-the-job training or formal Navy schooling. Advanced technical and operational training is available in this rating during later stages of career development.
Introduction to technical documentation, basic mechanical theory, safety precautions and programs, alignment and operation of piping systems and equipment, hand tools, precision instruments, lubricants, bearings, couplings, gears, valves, pumps and the Maintenance Material Management System (3M) Group instruction and practical application
Introduction to technical documentation, basic watch standing procedures, alignment and operation of piping systems and equipment, hand tools, precision instruments, lubricants and lubricating systems, bearings, couplings, gears, valves, the Maintenance Material Management System (3M), basic technical knowledge, terminology and watch standing procedures for the operation of conventional marine steam propulsion systems and preventive maintenance of plant equipment
During a 20-year period in the Navy, MMs spend about 70 percent of their time assigned to fleet units and 30 percent to shore stations. Shore assignments are normally at shore intermediate activities (SIMAs) as instructors in Class "A" or "C" Schools, as recruit company commanders or in recruiting duty.
Working Environment: Machinist's mates work within the hull of a ship in fire rooms, boiler rooms, engine rooms or shops. These locations are sometimes hot and noisy. MMs may be required to perform some heavy physical work. They must be able to work closely with others and, in some cases, with limited supervision
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