Low-Level Mixed Waste (LLMW) : LLMW is waste that contains LLRW and
hazardous waste. [EPA-MW]
Low population zone (LPZ):
An area of low population density often required around a nuclear installation before being built. The number and density of residents is of concern in
emergency planning so that certain protective measures (such as notification and instructions to residents) can be accomplished in a timely manner. [NRC]
LTP License Termination Plan [CY]
Lucky Dragon: The Fukuryu Maru (Lucky Dragon) was a small Japanese tuna boat, fishing about 90 miles east of Bikini at the time of the BRAVO test.
About two hours after the explosion a 'snow' of radioactive ash composed of vaporized coral began to fall on the ship.
Within hours, the crew members began to experience burning and nausea. Upon returning to Japan, many were hospitalized and one eventually
went into a coma and died. Though the U.S. denied responsibility, it sent the widow a check for 2.5 million yen "as a token of sympathy." [ATARC]
LUST: Leaking Underground Storage Tank
|------------------------ M ------------------------|
M/A: manual or automatic [NUREG-0544]
MAA: material access area [NUREG-0544]
MAAC: Mid-Atlantic Area Council [NUREG-0544]
MAAP: material access authorization program, modular accident analysis program [NUREG-0544]
MAC: maintenance action card, management advisory committee, Management Analysis Co., material accounting, maximum allowable concentration [NUREG-0544]
MACCT: multiple assembly cooling cask test [NUREG-0544]
MAD: maintenance assembly-disassembly [NUREG-0544]
MAELU: Mutual Atomic Energy Liability Underwriters [NUREG-0544]
MAG: magnetics [NUREG-0544]
MAI: miscellaneous actuation instrumentation [NUREG-0544]
MAIN: Mid-American Interpool Network [NUREG-0544]
MAIT: matrix analysis of insider threat [NUREG-0544]
MAM: management and administration manual [NUREG-0544]
MAN: Maschinenfabrik Augsberg-Nürnberg, A.G. (Germany) [NUREG-0544]
MAP: maintenance action plan, maintenance assessment package, methodology assessment program [NUREG-0544]
MAPI: Mitsubishi Atomic Power Industries, Inc. (Japan) [NUREG-0544]
MAPLHGR: maximum average planar linear heat-generation rate, maximum average
planar linear heat-generation ratio [NUREG-0544]
MAR: maintenance action request [NUREG-0544]
MARAD: Maritime Administration [NUREG-0544]
MARCA: Mid-Continent Area Reliability Coordination Agreement [NUREG-0544]
MARCH: meltdown accident response characteristic [NUREG-0544]
MASE: microwave amplification by stimulated emission [NUREG-0544]
MAT: management advisory team [NUREG-0544]
MB: mixed bed [NUREG-0544]
MB-2: Model Boiler-Two [NUREG-0544]
MBA: material balance area [NUREG-0544]
MBO: management by objective [NUREG-0544]
MBP: monobutyl phosphate [NUREG-0544]
Mbq: megabecquerel [NUREG-0544]
MBR: material balance report [NUREG-0544]
MC: main circulator, main condenser, major component, manual chapter (NRC), metal clad, Mitsubishi Corporation [NUREG-0544]
MCA: material control and accountability, maximum credible accident, multichannel analyzer [NUREG-0544]
MC&A: material control and accounting [NUREG-0544]
MCAP: Management Corrective Action Plan [NUREG-0544]
MCB: main control board [NUREG-0544]
MCC: Materials Characterization Center, motor control center, movement control center [NUREG-0544]
MCCB: molded-case circuit breaker [NUREG-0544]
MCES: main condenser evacuation system [NUREG-0544]
MCET: materials, chemical, and environmental technology [NUREG-0544]
MCHFR: minimum critical heat flux rate, minimum critical heat flux ratio [NUREG-0544]
MCI: managed cost improvement, millicurie [NUREG-0544]
MCIG: miscellaneous control and instrumentation group [NUREG-0544]
MCIS: materials compatibility in sodium [NUREG-0544]
MCLAMS: measurement, control, LEID (limit of error of the inventory difference) and MUF
(material unaccounted for) ID (inventory difference) simulation [NUREG-0544]
MCOV: maximum continuous operating voltage [NUREG-0544]
MCPR: maximum critical power ratio, minimum critical power ratio [NUREG-0544]
MCR: main control room, material certification report [NUREG-0544]
MCREC: main control room environmental control [NUREG-0544]
MCRH: main control room habitability [NUREG-0544]
MCRHS: main control room habitability system [NUREG-0544]
MCS: main circulator subsystem, master control station, Monte Carlo Sampling [NUREG-0544]
MCSS: metallic core support structure [NUREG-0544]
MCV: movable closure valve [NUREG-0544]
MD: management directive, measured discard [NUREG-0544]
MDA: minimum detectable activity [NUREG-0544]
MDAFWP: motor-driven auxiliary feedwater pump [NUREG-0544]
MDB: master database [NUREG-0544]
MDC: maximum dependable capacity, minimum detectable concentration, moderator density coefficient [NUREG-0544]
MDCT: mechanical draft cooling tower [NUREG-0544]
MDEFWP: motor-driven emergency feedwater pump [NUREG-0544]
MDEP: Maine Department of Environmental Protection [NUREG-0544]
MDF: mechanical design flow [NUREG-0544]
MDHR: mini-decay heat removal [NUREG-0544]
MDI: Many Diverse Interests, Inc. [NUREG-0544]
MDL: minimum detectable limit [NUREG-0544]
MDM: metal disintegration machining, modified diffusion method [NUREG-0544]
MDNBR: minimum departure from nucleate boiling ratio [NUREG-0544]
MDP: master decommissioning plan [NUREG-0544]
MDR: manufacturer's date report [NUREG-0544]
MDS: megawatt demand setter [NUREG-0544]
MDU: motion detection unit [NUREG-0544]
ME: maintenance effectiveness [NUREG-0544]
M&E: material and equipment [NUREG-0544]
MEA: maintenance engineering analysis, Materials Engineering Associates [NUREG-0544]
MEAG: Metropolitan Electric Authority of Georgia [NUREG-0544]
MEC: Mid American Energy Co. [NUREG-0544]
MECAS: multienergy californium assay system [NUREG-0544]
MEED: Metropolitan Edison Co. [NUREG-0544]
MEHC: Mid American Energy Holdings Co. [NUREG-0544]
MEF: median energy of fission [NUREG-0544]
MEFV: maintenance equipment floor valve [NUREG-0544]
MEGAS: multienergy gamma assay system [NUREG-0544]
MEI: maintenance effectiveness indicator, maximally exposed individual [NUREG-0544]
MEIS: minimum electrical isolation scheme [NUREG-0544]
MEL: master equipment list, Mitsubishi Electric Corp. (Japan) [NUREG-0544]
MELB: moderate-energy line break [NUREG-0544]
MELC: moderate-energy line crack [NUREG-0544]
MEOD: maximum extended operating domain [NUREG-0544]
MEPNS: Ministry of Environmental Protection and Nuclear Safety (Ukraine) [NUREG-0544]
MEQ: mechanical equipment qualification [NUREG-0544]
MERIT: management evaluation and risk identification tree [NUREG-0544]
MERITS: methodically engineered, restructured, and improved technical specifications [NUREG-0544]
MERLIN: Medium-Energy, Light-Water-Moderated, Industrial Nuclear Reactor (United
Kingdom) [NUREG-0544]
MES: maintenance engineering services [NUREG-0544]
MESA: multielement skew angle [NUREG-0544]
MESF: minimum engineered safety feature [NUREG-0544]
MESL: maximum emergency service load [NUREG-0544]
METAFRAM: Métallurgie Française des Poudres, S.A. (France) [NUREG-0544]
MEU: medium-enriched uranium [NUREG-0544]
MeV: million electron volts [NUREG-0544]
MEWS: Mixed Energy Waste Study [NUREG-0544]
MF: mound facility [NUREG-0544]
MFB: main feeder bus [NUREG-0544]
MFC: master flow controller [NUREG-0544]
MFCI: molten fuel coolant interaction [NUREG-0544]
MFCS: main feedwater control system [NUREG-0544]
MFI: minimum flow interlock [NUREG-0544]
MFIS: main feedwater isolation signal [NUREG-0544]
MFIV: main feedwater isolation valve [NUREG-0544]
MFL: main feedwater line, master fuse list, maximum foreseeable loss [NUREG-0544]
MFLPD: maximum fraction of limiting power density [NUREG-0544]
MFP: main feed power, main feedwater pump, mixed fission product [NUREG-0544]
MFPG: mixed fission products generator [NUREG-0544]
MFPT: main feedwater pump turbine [NUREG-0544]
MFPTC: main feed pump turbine condenser [NUREG-0544]
MFRV: main feedwater regulation valve [NUREG-0544]
MFS: main feedwater system, mobilization for survival [NUREG-0544]
MFT: multiprogramming with a fixed number of tasks [NUREG-0544]
MFTA: multiduct fuel test assembly [NUREG-0544]
MFV: main feedwater valve, maintenance floor valve [NUREG-0544]
MFW: main feedwater [NUREG-0544]
MFWCS: main feedwater and condensate system [NUREG-0544]
MFWLB: main feedwater line break [NUREG-0544]
MFWRV: main feedwater regulating valve [NUREG-0544]
MFWV: main feedwater valve [NUREG-0544]
MG: manual group, motor generator [NUREG-0544]
M/G: motor generator [NUREG-0544]
M-G: motor generator [NUREG-0544]
MGCR: maritime gas-cooled reactor [NUREG-0544]
MGCR-CX: maritime gas-cooled reactor--critical experiment [NUREG-0544]
MGDS: mined geologic disposal system [NUREG-0544]
MGEC: Madison Gas & Electric Co. [NUREG-0544]
MGVC: manual governing valve control [NUREG-0544]
MHA: maximum hypothetical accident [NUREG-0544]
MH-1A: Mobile High Power Plant No. 1A [NUREG-0544]
MHC: mechanical-hydraulic control [NUREG-0544]
MHD: magnetohydrodynamics [NUREG-0544]
MHDC: magnetohydrodynamic conversion [NUREG-0544]
MHFPR: maximum hypothetical fission-product release [NUREG-0544]
MHI: Mitsubishi Heavy Industries, Ltd. (Japan) [NUREG-0544]
MHNGS: Marble Hill Nuclear Generating Station [NUREG-0544]
MHP: material handling procedure [NUREG-0544]
MHTGR: modular high-temperature gas-cooled reactor [NUREG-0544]
MHTS: main heat transport system [NUREG-0544]
MI: manual individual, mineral insulated [NUREG-0544]
MIBK: methyl isobutyl ketone [NUREG-0544]
MIC: microbiologically induced corrosion, microbiologically influenced corrosion [NUREG-0544]
MICDS: movable in-core detector system [NUREG-0544]
MIDAS: meteorological information and dose acquisition system, meteorological
information and dose assessment system [NUREG-0544]
MIDS: movable
instrument drive system [NUREG-0544]
M&IE: meals and incidental expenses [NUREG-0544]
MIL: material identification list, material identification log [NUREG-0544]
MIMS: metal impact monitoring system [NUREG-0544]
MINET: momentum integral network [NUREG-0544]
MIP: maintenance improvement program, master inspection plan [NUREG-0544]
MIPS: master inspection planning system [NUREG-0544]
MIS: maintenance information system , management information system [NUREG-0544]
MIST: maximum isothermal system temperature, minor isotopes safeguards technique, multiloop integral system test [NUREG-0544]
MIT: Massachusetts Institute of Technology [NUREG-0544]
MITI: Ministry of International Trade and Industry (Japan) [NUREG-0544]
MITR: Massachusetts Institute of Technology Reactor [NUREG-0544]
MKU: Mary
Kathleen Uranium, Ltd. (Australia) [NUREG-0544]
ML: manufacturing license [NUREG-0544]
ML-1: Mobile Low Power Plant No. 1 [NUREG-0544]
MLD: mean low-water datum/data, median lethal dose [NUREG-0544]
MLHGR: maximum linear heat generation rate, maximum linear heat generation ratio [NUREG-0544]
MLO: main lube oil [NUREG-0544]
MLP: main loop pump [NUREG-0544]
MLS: Medilab Select (Belgium), multi-level secure [NUREG-0544]
MLSR: Monthly Letter Status Report [NUREG-0544]
MLSV: main loop shutoff valve [NUREG-0544]
MLW: mean low water [NUREG-0544]
MLWMS: miscellaneous liquid waste management system [NUREG-0544]
MM: mechanical maintenance, modified Mercalli [NUREG-0544]
MME: Mercantile Marine Engineering and Graving Docks Co., N.V. (Belgium) [NUREG-0544]
MMG: motor-motor generator [NUREG-0544]
MMI: man-machine interface, modified Mercalli intensity [NUREG-0544]
MMP: maintenance manual procedure [NUREG-0544]
MMPA: Magnetic Material Producers Association [NUREG-0544]
MMSA: man-machine systems analysis/analyses [NUREG-0544]
MMWEC: Massachusetts Municipal Wholesale Electric Co. [NUREG-0544]
MNCR: material nonconformance report [NUREG-0544]
MNGP: Monticello Nuclear Generating Plant [NUREG-0544]
MNP: maximum negative pressure [NUREG-0544]
MNPS: Millstone Nuclear Power Station [NUREG-0544]
MNS: McGuire Nuclear Station [NUREG-0544]
M&O: management and organizational [NUREG-0544]
MO: mixed oxide, modulate open, motor operator [NUREG-0544]
MOA: memorandum/memoranda of agreement [NUREG-0544]
MOC: middle of cycle, minimum operable channel [NUREG-0544]
MOD: motor-operated disconnect [NUREG-0544]
MODE: maximum organ dose equivalent [NUREG-0544]
MODEM: modulator-demodulator [NUREG-0544]
MONAL: mobile nondestructive assay laboratory [NUREG-0544]
MOOS: maintenance out of service [NUREG-0544]
MOP: maintenance outline procedure [NUREG-0544]
MOR: monthly operating report [NUREG-0544]
MORT: management oversight risk tree [NUREG-0544]
MOTA: materials open test assembly [NUREG-0544]
MOU: memorandum/memoranda of understanding [NUREG-0544]
MOV: metal oxide varister, motor-operated valve [NUREG-0544]
MOVATS: motor-operated valve analysis and test system [NUREG-0544]
MOX: mixed oxide [NUREG-0544]
MOXF: mixed-oxide fuel [NUREG-0544]
MP: magnetic particle, maintenance procedure, Midland Plant [NUREG-0544]
MPA: multiplant action, multiplant activity [NUREG-0544]
MPAI: maximum permissible annual intake [NUREG-0544]
MPBB: maximum permissible body burden [NUREG-0544]
MPC: maximum permissible concentration, Metals Properties Council, Montana Power Co., multi-purpose canister [NUREG-0544]
MPCA: maximum permissible concentration in air [NUREG-0544]
MPCW: maximum permissible concentration in water [NUREG-0544]
MPD: maximum permissible dose [NUREG-0544]
MPE: maximum permissible exposure [NUREG-0544]
MPFF: maintenance preventable functional failure [NUREG-0544]
MPL: master parts list, maximum permissible level, mechanical properties loop [NUREG-0544]
MP&L: Mississippi Power & Light Co. [NUREG-0544]
MPO: manufacturing production order [NUREG-0544]
MPP: maximum positive pressure [NUREG-0544]
M&PP: materials and plant protection [NUREG-0544]
MPR: mechanical pressure regulator [NUREG-0544]
MPRE: medium-power reactor experiment [NUREG-0544]
MPRT: multipurpose rail transport [NUREG-0544]
MPS: manpower system [NUREG-0544]
mps: meter per second [NUREG-0544]
MPS: monitoring and protection system, multipurpose sampler [NUREG-0544]
MPSC: Maine Public Service Co. [NUREG-0544]
MPT: magnetic particle testing, minimum pressurization temperature [NUREG-0544]
MPX: multiplexer [NUREG-0544]
MQE: materials and qualifications engineering, mechanical quality engineering [NUREG-0544]
MQS: motion to quash subpoena [NUREG-0544]
MR: material requisition, monitoring report [NUREG-0544]
MRB: Management Review Board [NUREG-0544]
MRBI: maintenance rule baseline inspection [NUREG-0544]
MRBT: multirod burst test [NUREG-0544]
MRC: Medical Research Council (United Kingdom) [NUREG-0544]
MREM: millirem [NUREG-0544]
MRI: material receiving instruction [NUREG-0544]
MRMU: mobile radiological measuring unit [NUREG-0544]
MRO: medical review officer [NUREG-0544]
MRP: modification/rework package [NUREG-0544]
MRPC: motorized rotating pancake coil [NUREG-0544]
MRR: material receiving report, medical research reactor [NUREG-0544]
MRS: manipulator repair shop, manufacturer's record sheet, monitored retrievable storage [NUREG-0544]
MRSS: main and reheat steam system [NUREG-0544]
MS: main steam, manual sequential, margin of safety, milestone [NUREG-0544]
M/S: maintenance/surveillance [NUREG-0544]
MSA: management self-assessment, material surveillance assembly, mechanical signature analysis/analyses, mines safety appliance [NUREG-0544]
MSAR: mines safety appliance research [NUREG-0544]
MSB: main steamline break, multi-assembly sealed basket [NUREG-0544]
MSBE: molten salt breeder experiment [NUREG-0544]
MSBR: molten salt breeder reactor [NUREG-0544]
MSCA: mixed spectrum critical assembly [NUREG-0544]
MSCI: molten steel coolant interaction [NUREG-0544]
MSG: modular steam generator [NUREG-0544]
MSGTR: multiple steam generator tube rupture [NUREG-0544]
MSHA: Mine Safety and Health Administration [NUREG-0544]
MSICV: main steam isolation check valve [NUREG-0544]
MSIP: modified stabilization in place [NUREG-0544]
MSIS: main steam isolation signal [NUREG-0544]
MSIV: main steam isolation valve [NUREG-0544]
MSIVLCS: main steamline isolation valve leakage control system [NUREG-0544]
MSL: main steamline, maximum still-water level, mean sea level [NUREG-0544]
MSLA: main steamline accident [NUREG-0544]
MSLB: main steamline break [NUREG-0544]
MSLD: mass spectrometer leak detector [NUREG-0544]
MSLI: main steamline isolation [NUREG-0544]
MSLIVSS: main steamline isolation valve sealing system [NUREG-0544]
MSLRDS: main steamline rupture detection system [NUREG-0544]
MSM: master/slave manipulator, modified source multiplication [NUREG-0544]
MSNM: special nuclear material of moderate strategic significance [NUREG-0544]
MSPB: Merit System Protection Board [NUREG-0544]
MSR: material status report, maximum steam rate, moisture separator reheater, molten salt reactor [NUREG-0544]
MSRE: molten salt reactor experiment [NUREG-0544]
MSRP: Multiple System Responses Program [NUREG-0544]
MSRV: main steam relief valve [NUREG-0544]
MSS: main steam system, main support structure, management systems section, Manufacturers Standardization Society of the Valve and Fittings Industry, mixed spectrum superheater, modified scram system [NUREG-0544]
MSSC: more safety-significant component [NUREG-0544]
MSSCE: mixed spectrum superheater critical experiment [NUREG-0544]
MSSR: mixed spectrum superheat reactor, main steam safety relief (valve) [NUREG-0544]
MSSS: main steam supply system, main steam support structure [NUREG-0544]
MSSV: main steam safety valve, main steam shutoff valve [NUREG-0544]
MSV: mean square voltage [NUREG-0544]
MS&W: maintenance shop and warehouse [NUREG-0544]
MT: magnetic particle test, magnetic particle testing, material transfer, materials test, melt through [NUREG-0544]
MTBF: mean time between failures [NUREG-0544]
MTC: moderator temperature coefficient, multi-assembly transfer cask [NUREG-0544]
M&TE: measuring and test equipment [NUREG-0544]
MTER: multitest evaluation report [NUREG-0544]
MTF: mean time to failure [NUREG-0544]
MTG: main turbine generator [NUREG-0544]
MT/G: main turbine generator [NUREG-0544]
MTI: maintenance team inspection, mandatory team inspection, Mechanical Technology, Inc. [NUREG-0544]
MTL: materials test loop, Mobiltherm light [NUREG-0544]
MTOS: magnetic tape operations system [NUREG-0544]
MTPF: maximum total peaking factor [NUREG-0544]
MTR: materials testing reactor [NUREG-0544]
MTS: module tracking system [NUREG-0544]
MTT: microwave theory and techniques [NUREG-0544]
MTTF: mean time to failure [NUREG-0544]
MTTR: mean time to repair, mean time to replacement [NUREG-0544]
MTU: metric ton of uranium, metric ton unit, module test unit [NUREG-0544]
MU: makeup [NUREG-0544]
MUF: material unaccounted for [NUREG-0544]
MUG: MOV Users Group [NUREG-0544]
MU&P: makeup and purification [NUREG-0544]
MUR: management update and retrieval, mockup reactor [NUREG-0544]
MUSE: Musicians United for Safe Energy [NUREG-0544]
MUT: makeup tank [NUREG-0544]
MUTN: MOVATS Users Technical Notice [NUREG-0544]
MUX: multiplexer [NUREG-0544]
MVP: mechanical vacuum pump [NUREG-0544]
MVS: multiple virtual storage [NUREG-0544]
MVT: multiprogramming with a variable number of tasks [NUREG-0544]
MW: megawatt [NUREG-0544]
MWDC: multiple weld data card [NUREG-0544]
Mwe: megawatt electric [NUREG-0544]
MWHT: miscellaneous waste holdup tank [NUREG-0544]
MWO: maintenance work order [NUREG-0544]
MWS: makeup water system [NUREG-0544]
MWST: makeup water storage tank, miscellaneous waste storage tank [NUREG-0544]
Mwt: megawatt thermal [NUREG-0544]
MW-yr: megawatt-year [NUREG-0544]
MYAP: Maine Yankee Atomic Power Co. [NUREG-0544]
MYAPS: Maine Yankee Atomic Power Station [NUREG-0544]
MZFR: Mehrzweck Forschungsreaktor (Germany) [NUREG-0544]
m: metastable [DOELLWRpt]
m3: cubic meters [DOELLWRpt]
Mach Stem: The shock front formed by the merging of the incident and reflected shock fronts from an explosion. [ATARC]
Macroencapsulation: A process using molten polyethylene (or similar material) to
surround items such as debris with radioactive surface contamination or pieces of con-taminated
lead, thereby rendering the hazardous constituents immobile and unable to
leach into the surrounding environment. [EPALLRW]
MACT Rule: MACT Rule applies to hazardous waste incinerators, cement
kilns, and light weight aggregate kilns and sets the emission standards for D/F,
Hg, Sb, As, Be, Cr, HCl/Cl2, CO, and HC. The rules requires
continuous emissions monitoring, tied in with operational performance controls
and a feed shutoff. The EPA plans to issue the final MACT Rule in 1998.
[DOE/EM-0342]
Magenta Dolomite: The upper of the two dolomite layers within the Rustler Formation that are
locally water-bearing. [WIPPEA]
Magnetic confinement
In fusion research, the use of shaped magnetic fields to confine a plasma. [AT]
magnitude (earthquake) A measure of the total energy released by an earthquake. It is commonly
measured in numerical units on the Richter scale. Each unit, e.g. 7, is
different from an adjacent unit by a factor of 30. [WIPPEA]
Major Accomplishments Description: The description of the major accomplishments for a unit of work during the reporting period. [DOEEMGMT]
Major Item of Equipment (MIE): Capital equipment not related to construction, or a group of automatic data processing (ADP) components having a total estimated purchase value of $1,000,000 or more, including related capital costs. (See Major System)[DOEEMGMT]
Major Systems Acquisition (MSA) (See Strategic Systems)
Major System (formerly Major Project)
A special type of line item project that is a single stand-alone effort within a project mission area that is a primary means to advance the Department's strategic goals. Designation of a major system is determined by the Secretary, based on cost ($100 to 400 million), risk factors, international implications, stakeholder interest, and national security. [DOEEMGMT]
Major Threshold: A variance threshold that is used to isolate values that fall outside set criteria. [DOEEMGMT]
Manhattan Engineer District (MED): Established in August 1942, this
district of the U.S. Army Corps of Engineers was the agency authorized to oversee
the design, production, and testing of the first nuclear weapons. On January 1,
1947, the district transferred authority over nuclear weapons stewardship to the
civilian authority of the newly established Atomic Energy Commission; the
district was abolished later that year. [DOE/EM-0319]
Manhattan Project: The U.S. Government project that produced the
first nuclear weapons during World War II. Started in 1942, the Manhattan Project
formally ended in 1946. The Hanford Site, Oak Ridge Reservation, and Los Alamos
National Laboratory were created for this effort. The project was named for the
Manhattan Engineer District of the U.S. Army Corps of Engineers. [DOE/EM-0466]
The Manhattan Project was the code name for
the U.S. effort during World War II to produce the atomic bomb. The
program was under the leadership of Gen. Leslie Groves, and theoretical
physicist J. Robert Oppenheimer. The main laboratory was built on an
isolated mesa at Los Alamos, New Mexico. The first atomic bomb was tested at Alamogordo, New Mexico, on July 16, 1945.
[ATARC]
MARSSIM - Multi-Agency Radiation Survey and Site Investigation Manual.
Guidance developed by the Nuclear Regulatory Commission, the U.S. Environmental
Protection Agency, the U.S. Department of Energy and the U.S. Department of
Defense that provides a statistical methodology for evaluating radiation survey
data. [CY]
MARV: The maneuvering reentry vehicle (MARV) is one of the latest developments in nuclear weapons delivery systems. MARVs are designed either to deliver a nuclear warhead with pinpoint accuracy, or to enable the warhead to avoid enemy detection and destruction through evasive maneuvers.
MARVs are expected to have an accuracy of 36.6 m (120 ft) after a flight of 1,609 km (1,000 mi). MARVs designed for evasive maneuvers employ such techniques as small steering rockets, internal weight shifting, and movable flaps or fins. [ATARC]
Mass defect
The difference between the mass of a nucleus and the sum of the masses of its constituent nucleons. It is related to the binding energy of
the nucleus by Einstein's equation E=mc2. [AT] The mass of an atom's nucleus is less than the sum of its constituents' masses. [ATARC]
Mass-energy equation:
The equation developed by Albert Einstein, which is usually given as E=mc2, showing that, when the energy of a body changes by an amount E (no matter
what form the energy takes), the mass, m, of the body will change by an amount equal to E/c2. The factor c2, the square of the speed of light in a vacuum
(3x108 meters/second), may be regarded as the conversion factor relating units of mass and energy. The equation predicted the possibility of releasing
enormous amounts of energy by the conversion of mass to energy. It is also called the Einstein Equation. [NRC]
mass number (symbolized A): The sum of the number
of protons and the number of neutrons in a nucleus. [IEER]
Mass spectrometer
An analytical instrument in which accelerate positive ions of a material are separated electromagnetically according to their charge to mass
ratios. Different species can be identified and accurate measurements made of their relative concentrations. [AT]
Matched sales: These are uranium sales under the Suspension Agreement
that must comprise an
equal amount of Russian natural uranium and newly produced domestic uranium.
[DOE/EA-1172]
Materials in Inventory Initiative: Established in February 1995 by the Department
of Energy to quantify surplus materials and identify potential
associated concerns. This initiative encompassed materials in
storage that are not currently in use, that have not been used
for a period of at least one year, and that are not expected to
be used within the next year. Categories of materials to be reviewed
include: scrap metals, enriched and natural uranium, lithium,
sodium, chemicals, plutonium and other Nuclear Materials Management
Safeguards System-tracked materials, and lead.
[DOELL]
Materials in inventory: Materials that are not currently in use (i.e.,
have not been used during the last year and are not expected to be used within
the coming year) and have not been designated as waste or set aside by the
Nuclear Weapons Council for national defense purposes. For nuclear materials,
'not currently in use' is synonymous with 'inactive' per DOE Order 5660.1B.
[DOE/EM-0319]
Maximum dependable capacity (gross):
Dependable main-unit gross generating capacity, winter or summer, whichever is smaller. The dependable capacity varies because the unit efficiency varies
during the year due to temperature variations in cooling water. It is the gross electrical output as measured at the output terminals of the turbine generator during
the most restrictive seasonal conditions (usually summer). [NRC]
Maximum dependable capacity (net): Gross maximum dependable generating capacity less the normal station service loads.[NRC]
MCLs: Maximum Contaminant Levels (Drinking Water Standards)
MCL - Maximum concentration limit, the regulatory limit for various
constituents, usually organics and inorganics; there are different levels for
different media, such as air, soil, and water. The MCL cannot be exceeded. [CY]
Megawatt /Megawatt hour (MWh): One million (106) watts or watt-hours. [NRC]
Metallurgical Laboratory (Met. Lab): Located at the University of Chicago, and led by Enrico Fermi, began work towards a controlled chain reaction. Chicago Pile Number One or CP-1 went critical on December 2, 1942. They continued to work on further investigation of nuclear reactions.
The most vocal protest over the bomb's use came from the Met. Lab and was led by Leo Szilard.
[ATARC]
metric ton: 1,000 kilograms of about 2,204 pounds. The usual U.S. ton
measurement, called a short ton, is 2,000 pounds. [IEER]
MeV: One million electron volts. [LBNL] A unit of energy equivalent to
1.6 -6 erg. Approximately 200 MeV of energy are produced for every
nucleus that undergoes fission.
mi: mile [DOELLWRpt]
micron: One one-millionth of a meter. [IEER]
Midgetman: Recommended for development by the bipartisan Presidential
Commission on Strategic Forces, Midgetman is a new, small, highly mobile,
single-warhead intercontinental ballistic missile. While the development and
eventual deployment of Midgetman is expected to strengthen the land-based
segment of the U.S. nuclear defense triad, it is also expected to influence or
alter arms control negotiations. The single-warhead Midgetman would be fully
effective only if limitations were set on the total number of warheads.
[ATARC]
MIKE Test, The: On November 1, 1952 a 10.4 megaton thermonuclear explosion, code-named MIKE, at Eniwetok Atoll demonstrated the release of energy from nuclear fusion. The apparatus was an experimental device, not a weapon, that had been constructed on the basis of the principles developed by Edward Teller and Stanislaw Ulam.
The island of Elugelab in the Eniwetok Atoll on which the test was conducted, was completely vaporized. [ATARC]
Milestone: An important or critical event that must occur in the project cycle to achieve project objectives. [DOEEMGMT]
Milestone Actual Date: The date when a milestone is accomplished. [DOEEMGMT]
Milestone Category: The status category for a milestone that further defines the progress of ongoing activities. [DOEEMGMT]
Milestone Comments: A narrative explanation of milestone status on an exception basis. If a milestone is overdue or has a forecast delay or forecast early status, the comments provide other information required by the program or project manager. The information may include an explanation for the projected delay; the status of negotiations with regulators, including date of agreement; the enforcement status, including existing or projected Notices of Violation (NOVs) or fines and penalties; or a revised forecast date. [DOEEMGMT]
Milestone Decrement Date: The projected date a milestone can be accomplished assuming that the decrement level funding is provided for the unit of work. [DOEEMGMT]
Milestone Description: Information about a milestone in a form that is understandable to a lay person. The milestone description more fully describes a milestone if the milestone title is not sufficient. [DOEEMGMT]
Milestone Forecast Date: The date when an Operations/Field Office Project Manager expects to accomplish a milestone if this date is different from the planned date. [DOEEMGMT]
Milestone Keyword: A word used to categorize a milestone. [DOEEMGMT]
Milestone Level: The Baseline Change Control Board level or change authority level for a milestone. [DOEEMGMT]
Milestone Number: An optional alphanumeric identifier for a milestone. [DOEEMGMT]
Milestone Planned Date: The date when a milestone is planned to be accomplished. For enforceable agreements, the planned date is the date recorded in the agreement. For other baselines milestones, the planned date is the baseline date and therefore, can only be changed through a Baseline Change Control Board action. [DOEEMGMT]
Milestone Planning Date: The projected date on which the milestone can be accomplished assuming that the planning level funding is provided for the unit of work. [DOEEMGMT]
Milestone Regulatory Driver Reference: The specific reference or source document for the regulatory requirement that applies to the completion of the milestone. [DOEEMGMT]
Milestone Status: An evaluation of the milestone planned, actual, and forecast dates against the as-of date.
Milestone Target Date: The protected date a milestone can be accomplished assuming that the target level funding is provided for the unit of work. [DOEEMGMT]
Milestone Title: A brief descriptive title identifying the milestone. [DOEEMGMT]
Milestone Type: An alphabetic code indicating the type of milestone. [DOEEMGMT]
Milliroentgen: One thousandth of a roentgen, R. (1 mR = 10-3R) [NRC]
Mill tailings:
Naturally radioactive residue from the processing of uranium ore.
Although the milling process recovers about 93 percent of the uranium, the residues (or
tailings), contain several naturally occurring radioactive elements, including uranium,
thorium, radium, polonium, and radon. [EPALLRW]
A slurry of about 40 percent solids (including
radioactive particles and chemically hazardous metals) and 60 percent liquid,
primarily water. [IEER]
The sand-like materials left over from separating
uranium from its ore. More than 99 percent of the ore becomes tailings. Mill
tailings, which are one type of 11 e(2) byproduct material, typically contain
about 85 percent of the radioactivity present in unprocessed ore.
[DOE/EM-0319]
See also: "Uranium Mill Tailings"
Milk:
To elute a cow. [LBNL]
MIMS: Manifest Information Management System [TNRCC]
Mined geologic disposal: See geologic repository. [DOE/EM-0266]
Minigenerator:
A trademark of Union Carbide Corporation that is used to identify radioisotope generator systems for educational use. [LBNL]
Minimal Action: An alternative scenario that completely rescopes projects and activities
to minimize costs while maintaining Base Case human health and
environmental risks and without the restrictions of current environmental
regulations or agreements. One of three alternative cases analyzed
as part of the Baseline Report.
[DOELL]
Minimum treatment (for LLW) The least amount of treatment required to allow on-site
disposal or transportation to another site for disposal. [EPALLRW]
Minor Threshold: A variance threshold that is used to isolate those values that fall between negligible and critical parameters. [DOEEMGMT]
Minuteman Missile: Minuteman was one of the earliest intercontinental ballistic missiles (ICBMs) developed by the United States. Of the three versions of Minuteman that have been deployed, only Minuteman III is still in service.
The Minuteman III is susceptible to reduction under the terms of the 1991 START treaty, although the treaty does not specify the actual weapons by name. Cuts in the number of Minuteman III warheads are, therefore, anticipated. [ATARC]
Mixed Transuranic Waste (MTRU) : MTRU contains both Transuranic (TRU)
and hazardous
wastes. Approximately 55% of DOE's TRU is MTRU. [EPA-MW]
Mixed Waste (MW) : MW contains both hazardous waste (as defined by RCRA
and its amendments) and radioactive waste (as defined by AEA and its amendments).
It is jointly regulated by NRC or NRC's Agreement States and EPA or EPA's RCRA
Authorized States.
The fundamental and most comprehensive statutory definition is found in the
Federal Facilities Compliance Act (FFCA) where Section 1004(41) was added to
RCRA: "The term 'mixed waste' means waste that contains both hazardous waste and
source, special nuclear, or byproduct material subject to the Atomic Energy Act
of 1954." [EPA-MW]
Mixed Low-Level Waste (MLLW): DOE Order 435.1 defines mixed low-level waste as
waste containing
both radioactive and hazardous components as defined by the Atomic Energy Act and
the
Resource Conservation and Recovery Act, respectively. [DOE/ LLW DispCapRpt
Rev2]
Mixed oxide fuel: A mixture of uranium oxide and plutonium oxide used to fuel a reactor. Often it is abbreviated as "MOX."
Conventional fuel is made of pure uranium oxide. [NRC]
Moderator: A material, such as ordinary water, heavy water, or graphite, that is used in a reactor to slow down
high-velocity neutrons, thus decreasing the likelihood of
fission. [NRC] A material used to reduce neutron energy
(for fissioning if in a reactor) by elastic scattering. [DOE-IDB97]
Moderator temperature coefficient of reactivity: The change in reactivity per degree change in moderator temperature due to the property of the reactor moderator to slow down fewer neutrons as its
temperature increases. This acts to stabilize power reactor operations. [NRC]
Molecules: Larger structures formed by the bonding of atoms.
[DOE/EM-0266]
monitoring well - A hole drilled into the ground with a pipe inserted to
allow for the collection of groundwater samples. [CY]
MOX: A fuel composed of a mixture of plutonium dioxide and uranium
dioxide. [IEER] See Mixed Oxide Fuel
Multiple Independently Targetable Reentry Vehicle (MIRV): A package of two or more warheads which can be carried by a single ballistic missile but are deliverable to separate targets. [ATARC]
Multi-purpose canister - Also MPC. A canister containing spent fuel
assemblies or high level waste that is certified for dry storage, transporting
offsite and for a U.S. Department of Energy (DOE) disposal repository. [CY]
mR/hr: millirem per hour [DOELLWRpt]
MRS facility: A proposed facility for the monitored
retrievable storage of spent nuclear fuel from
commercial power plants. Such a facility would permit
continuous monitoring, management, and maintenance
of these wastes and provide for their ready retrieval for
further processing or disposal. [DOE-IDB97] MRS has also been
implemented in other waste management concepts,
such as assured isolation.
MSDS: Material Safety Data Sheet
Mutual Assured Destruction (MAD): The present situation in which the superpowers have the ability to inflict an unacceptable degree of damage upon each other even after absorbing a first strike; a condition which deters both sides from initiating hostilities. [ATARC]
MX Missile: The United States MX (MX‚missile experimental) program has had a long and controversial history. Beginning in the 1960s, U.S. military experts anticipated growing improvement in the accuracy and number of Soviet missile systems, to the point where they would be able to attack and destroy the concrete underground silos within which the land-based U. S. intercontinental ballistic missiles (ICBMs) were housed. It therefore seemed necessary that new missiles should be deployed in such a way that they would be invulnerable to Soviet attack. [ATARC]
|------------------------ N ------------------------|
NA: not applicable, not available [NUREG-0544]
N/A: not applicable [NUREG-0544]
NAA: neutron activation analysis/analyses [NUREG-0544]
NAB: nuclear assembly building [NUREG-0544]
NAC: national agency check, Nuclear Assurance Corporation [NUREG-0544]
NACE: National Association of Corrosion Engineers [NUREG-0544]
NAD: nuclear accident dosimetry [NUREG-0544]
NAEC: North Anna Environmental Coalition [NUREG-0544]
NAESCO: North Atlantic Energy Service Corp. [NUREG-0544]
NAFTA: North American Free Trade Agreement [NUREG-0544]
NAGRA: Nationale Genossenschaft für die Lagerung Radioaktiver Abfälle
(Switzerland) [NUREG-0544]
NAI: sodium iodide [NUREG-0544]
NAIG: Nippon Atomic Industry Group Co., Ltd. (Japan) [NUREG-0544]
NAN: Nuclear Awareness Network [NUREG-0544]
NANT: National Academy for Nuclear Training [NUREG-0544]
NAPA: National Academy of Public Administration [NUREG-0544]
NAPCA: National Air Pollution Control Administration [NUREG-0544]
NAPS: North Anna Power Station [NUREG-0544]
NAPSIC: North American Power Systems Interconnection Committee [NUREG-0544]
NAPUS: nuclear auxiliary power unit system [NUREG-0544]
NARA: National Archives and Records Administration [NUREG-0544]
NARADCom: Natick Research and Development Command [NUREG-0544]
NARM: naturally occurring or accelerator-produced radioactive material [NUREG-0544]
NARUC: National Association of Regulatory Utility Commissioners [NUREG-0544]
NAS: National Academy of Sciences, nonreactor assessment staff [NUREG-0544]
NASA: National Aeronautics and Space Administration [NUREG-0544]
NASAP: Nonproliferation Alternative Systems Assessment Program [NUREG-0544]
NAS-NRC: National Academy of Sciences--National Research Council [NUREG-0544]
NASE: National Academies of Science [NUREG-0544]
NASUCA: National Association of State Utility Consumer Advocates [NUREG-0544]
NAWAS: national warning system [NUREG-0544]
NB: nuclear blank, nuclear boiler [NUREG-0544]
NBGEL: New Bedford Gas and Edison Light Co. [NUREG-0544]
NBL: New Brunswick Laboratory [NUREG-0544]
NBP: New Brunswick Power (Canada) [NUREG-0544]
NBR: nuclear boiler rated [NUREG-0544]
NBS: National Bureau of Standards (now National Institute of Standards and
Technology) [NUREG-0544]
NBSR: National Bureau of Standards Reactor [NUREG-0544]
NC: neutron controller, normally closed, nuclear construction [NUREG-0544]
NCA: neutron control assembly [NUREG-0544]
NCAI: National Congress of American Indians [NUREG-0544]
NCBR: near-commercial breeder reactor [NUREG-0544]
NCF: no containment failure [NUREG-0544]
NCIG: Nuclear Construction Issues Group (EPRI) [NUREG-0544]
NCP: network control program [NUREG-0544]
NCR: nonconformance report, nonconforming condition report, notification-of-change report [NUREG-0544]
NCRERP: North Carolina Radiation Emergency Response Plan [NUREG-0544]
NCRP: National Council on Radiation Protection [NUREG-0544]
NCRP(M): National Committee on Radiation Protection and Measurements [NUREG-0544]
NCRWS: National Campaign for Radioactive Waste Safety [NUREG-0544]
NCS: national communications system, nuclear criticality safety [NUREG-0544]
NCSA: National Center for Supercomputing Applications [NUREG-0544]
NCSAG: Nuclear Cross Section Advisory Group [NUREG-0544]
NCSCR: North Carolina State College Reactor [NUREG-0544]
NCSL: National Conference of State Legislatures [NUREG-0544]
NCSS: neutron control subsystem [NUREG-0544]
NCSUR: North Carolina State University Reactor [NUREG-0544]
NCV: non-cited violation [NUREG-0544]
NCVP: natural circulation verification program [NUREG-0544]
ND: negative declaration, normally deenergized [NUREG-0544]
NDA: no detectable activity, nondestructive analysis, nondestructive assay [NUREG-0544]
NDC: nuclear data committee [NUREG-0544]
NDCT: natural draft cooling tower [NUREG-0544]
NDE: nondestructive examination [NUREG-0544]
NDHX: natural draft heat exchanger [NUREG-0544]
NDL: nuclear data link [NUREG-0544]
NDRC: National Defense Research Council [NUREG-0544]
NDT: nil ductility temperature, nil ductility transition, nondestructive testing [NUREG-0544]
NDTT: nil ductility transition temperature [NUREG-0544]
NE: normally energized, nuclear engineering [NUREG-0544]
NEA: Northeast Energy Alliance, Nuclear Energy Agency (OECD), Nuclear Engineering Associates [NUREG-0544]
NEB: Nuclear Energy Board (Ireland) [NUREG-0544]
NEC: National Electrical Code, Nuclear Energy Center [NUREG-0544]
NECAP: Nutmeg Electric Companies Atomic Project [NUREG-0544]
NECNP: New England Coaliltion on Nuclear Pollution [NUREG-0544]
NECO: Nuclear Engineering Company [NUREG-0544]
NECSS: Nuclear Energy Center Site Survey [NUREG-0544]
NEDS: nuclear employee data system [NUREG-0544]
NEES: New England Electric System [NUREG-0544]
NEGEA: New England Gas and Electric Association [NUREG-0544]
NEI: Nuclear Energy Institute (formerly NUMARC and USCEA) [NUREG-0544]
NEIL: Nuclear Electric Insurance Limited [NUREG-0544]
NEJAC: National Environmental Justice Advisory Council [NUREG-0544]
NELIA: Nuclear Energy Liability Insurance Association [NUREG-0544]
NELPIA: Nuclear Energy Liability Property Insurance Association [NUREG-0544]
NEMA: National Electrical Manufacturers Association [NUREG-0544]
NENE: Northeast Nuclear Energy Co. [NUREG-0544]
NEO: nuclear engineering and operations [NUREG-0544]
NEP: New England Plant [NUREG-0544]
NEPA: National Environmental Policy Act [NUREG-0544]
NEPCO: New England Power Company [NUREG-0544]
NEPIA: Nuclear Energy Property Insurance Association [NUREG-0544]
NERA: National Economic Research Associates, Inc. [NUREG-0544]
NERC: National Electric Reliability Council, National Environment Resource Council (United Kingdom), Nuclear
Energy Research Centre (Belgium) [NUREG-0544]
NERHL: Northeastern Radiological Health Laboratory [NUREG-0544]
NERP: nuclear experience review program [NUREG-0544]
NERV: nuclear emulsion recovery vehicle [NUREG-0544]
NERVA: nuclear engine for rocket vehicle application [NUREG-0544]
NESC: National Electric Safety Code, Nuclear Energy Software Center [NUREG-0544]
NESCWS: nonessential services chilled water system [NUREG-0544]
NESDIP: Nestor Shielding and Dosimetry Improvement Program [NUREG-0544]
NESF: normal engineered safety feature [NUREG-0544]
NESP: National Environmental Studies Project [NUREG-0544]
NEST: nuclear emergency search team [NUREG-0544]
NETR: Nuclear Engineering Test Reactor [NUREG-0544]
NEU: Northeastern Utilities (Company) [NUREG-0544]
NEUSSN: Northeastern U.S. Seismic Network [NUREG-0544]
NEUT: Northeast Utilities [NUREG-0544]
NEVP: Nevada Power Co. [NUREG-0544]
NEW: Nuclear Energy Women [NUREG-0544]
NEWS: Nuclear Engineering Workstation Simulator [NUREG-0544]
NEWSTAR: nuclear energy waste space transportation and removal [NUREG-0544]
NF: neutron flux [NUREG-0544]
NFC: no further consequences [NUREG-0544]
NFCA: nonfuel core array [NUREG-0544]
NFI: Nuclear Fuel Industries, Ltd. (Japan) [NUREG-0544]
NFPA: National Fire Protection Association [NUREG-0544]
NFRRC: nuclear fuel recovery and receiving center [NUREG-0544]
NFS: network file system, Nuclear Fuel Services Co. [NUREG-0544]
NFSA: new fuel storage area [NUREG-0544]
NG: nitroglycerin, noble gas [NUREG-0544]
NGA: Nationale Gesellschaft für Förderung der Industriellen Atomtechnik
(Switzerland) [NUREG-0544]
NGE: North Georgia Electric Membership Corp. [NUREG-0544]
NGF: Natural Guard Fund [NUREG-0544]
NGN: Next Generation Network [NUREG-0544]
NGSF: noble gas storage facility [NUREG-0544]
NHPA: National Historic Preservation Act [NUREG-0544]
NHY: New Hampshire Yankee [NUREG-0544]
NI: never incorporated, nuclear instrument, nuclear instrumentation, nuclear island [NUREG-0544]
NIAC: Nuclear Industry Assessment Committee, Nuclear Insurance Association of Canada [NUREG-0544]
NIC: Nuclear Industry Check Valve Group, Nuclear Industry Consortium (Belgium) [NUREG-0544]
NICWB: nuclear island cooling water building [NUREG-0544]
NIDA: National Institute on Drug Abuse [NUREG-0544]
NIH: National Institutes of Health (U.S. Public Health Service) [NUREG-0544]
NII: Nuclear Installations Inspectorate (United Kingdom) [NUREG-0544]
NIM: nuclear instrument module [NUREG-0544]
NiMo: Niagara Mohawk Power Corp. [NUREG-0544]
NIOBE: numerical integration of the Boltzmann equation [NUREG-0544]
NIOSH: National Institute for Occupational Safety and Health (U.S. Public Health Service) [NUREG-0544]
NIPA: notice of initiation of procurement action [NUREG-0544]
NIPS: Northern Indiana Public Service Co. [NUREG-0544]
NIRA: Nucleare Italiana Reattori Avanzati, SpA (Italy) [NUREG-0544]
NIRB: Nuclear Insurance Rating Bureau [NUREG-0544]
NIRL: negligible individual risk level [NUREG-0544]
NIRMA: Nuclear Information and Records Management Association, Inc. [NUREG-0544]
NIRNS: National Institute for Research in Nuclear Science (United Kingdom) [NUREG-0544]
NIRS: National Institute of Radiological Sciences (Japan), Nuclear Information
and Resource Service [NUREG-0544]
NIS: Network Information Service, Nevada Inspection Service, Newly Independent States, nuclear instrumentation system [NUREG-0544]
NISCO: Nuclear Inspection Services Company [NUREG-0544]
NISP: National Industrial Security Program [NUREG-0544]
NISPOM: National Industrial Security Program Operating Manual [NUREG-0544]
NIST: National Institute of Standards and Technology (formerly National Bureau of
Standards) [NUREG-0544]
NJBPU: New Jersey Board of Public Utilities [NUREG-0544]
NJOAL: New Jersey Office of Administrative Law [NUREG-0544]
NLI: National Lead Industries, Nuclear Industries, Inc. [NUREG-0544]
NMA: National Mining Association [NUREG-0544]
NMAC: Nuclear Maintenance Assistance Center (Electric Power Research Institute) [NUREG-0544]
NMCC: Nuclear Material Control Center (Japan) [NUREG-0544]
NMDB: nuclear maintenance database [NUREG-0544]
NMEC: Northern Michigan Electric Cooperative, Inc. [NUREG-0544]
NMED: nuclear material events database [NUREG-0544]
NMIS: nuclear materials information system, nuclear materials inventory system [NUREG-0544]
NMMSS: nuclear materials management and safeguards system [NUREG-0544]
NMP: national meter programming, Niagara Mohawk Power Corp. [NUREG-0544]
NMPNS: Nine Mile Point Nuclear Station [NUREG-0544]
NMRG: Nuclear Managers Review Group [NUREG-0544]
NMS: national measurement system, neutron monitoring system [NUREG-0544]
NMSS: Nuclear Material Safety and Safeguards, Office of (NRC) [NUREG-0544]
NMST: new materials system test [NUREG-0544]
NMT: nuclear medicine technologist [NUREG-0544]
NN: nearest neighbor, nearest neighboring [NUREG-0544]
NNC: National Nuclear Corporation, Ltd. (United Kingdom) [NUREG-0544]