| date | INES | title | location  |
|---|
| 25-04-2003 | INES 1 | Heavy water leak from a defuelled coolant channel in a PHWR during Inspection, with reactor in shutdown state | NARORA-2, India |
| 31-03-1993 | INES 3 | COMPLETE STATION BLACK OUT DUE TO FIRE IN TURBINE BUILDING | NARORA-1, India |
| 19-03-1996 | INES 0 | Unit trip on no primary circulating pump running | NARORA-1, India |
| 28-11-2000 | INES 0 | Forced shutdown of Narora Unit-1 due to unavailability of make up water | NARORA-1, India |
| 09-09-2019 | INES 0 | Lost of radioactive sealed source | Morelia. Michoacan, Mexico |
| 29-06-2003 | INES 2 | FAILURE OF FIXED GAUGING DEVICE RESULTING IN RADIATION EXPOSURE TO MEMBERS OF THE PUBLIC | Monsanto Chemical Plant, United States of America |
| 09-01-2004 | INES 2 | Overexposure to Radiation Worker | Monroe, United States of America |
| 08-12-1995 | INES 1 | Secondary sodium leakage in the prototype fast breeder reactor Monju | MONJU, Japan |
| 26-10-2013 | INES 2 | Deficiency in the determination of the uranium content of liquid waste tanks | Molybdenum Production Facility / Petten, Netherlands |
| 17-10-2013 | INES 2 | Deficiency in the determination of the uranium content of liquid waste tanks | Molybdenum Production Facility / Petten, Netherlands |
| 03-08-2020 | INES 2 | Overexposure to Worker | Mobile, Alabama / Applied Technical Services, Inc., United States of America |
| 24-08-2016 | INES 2 | Overexposure to Radiographer | Mistras Group/Deer Park Texas, United States of America |
| 26-07-1997 | INES 1 | Slightly increased radioactivity release outside the reactor while preparing for removal of leaky fuel assembly | MIR-M1, RU-0013, Russian Federation |
| 03-08-2004 | INES 0 | Potential Radiation Overexposure to a Radiographer | Mills, United States of America |
| 09-02-1991 | INES 2 | STEAM GENERATOR TUBE BREAK | MIHAMA-2, Japan |
| 17-11-1992 | INES 2 | OVEREXPOSURE OF WORKER DUE TO THE MALFUNCTION OF THE INTERLOCK SYSTEM | MICROTRON, Viet Nam |
| 06-07-2018 | INES 1 | Stolen industrial radiography device in Mexico City | Mexico City, Mexico |
| 29-09-2008 | INES 2 | Radiographer Overexposure to Extremity | Metco, United States of America |
| 14-09-2007 | INES 2 | Potential Radiographer Overexposures | Metco, United States of America |
| 07-10-2008 | INES 2 | Cobalt-60 contaminated elevator buttons sold abroad by a French company | Metallic products manufacturer, France |
| 15-05-1997 | INES 2 | Discovery of a Cs-137 radiation source on a scrap yard | METAL FOUNDRY, HETTSTEDT, Germany |
| 23-03-1999 | INES 2 | Theft of a vehicle containing a GAM80 gamma radiography unit (with 80 Ci source) | Mesnil Amelot, France |
| 26-07-2004 | INES 2 | Worker injured and contaminated at the French MOX processing plant MELOX | MELOX Fuel process plant, France |
| 03-03-2009 | INES 2 | Non-respect of a safety-criticality requirement at AREVA NC Melox facility (Marcoule) | MELOX Fuel process plant, France |
| 11-02-2020 | INES 2 | Internal contamination of a worker in a fuel pellets fabrication workshop | Melox - Orano Cycle - Marcoule, France |
| 27-12-2008 | INES 0 | Very low activity source found in scrap metal | Meghri, Armenia |
| 29-12-2003 | INES 2 | Unshielded radioactive source found in metal scrap | Meghri, Armenia |
| 26-06-2000 | INES 4 | Lost source causing a radiological accident at Meet Halfa, Egypt | MEET HALFA, Egypt |
| 04-01-1994 | INES 2 | POWER EXCURSION AT MCMASTER NUCLEAR RESEARCH REACTOR DURING FUEL LOADING | MCMASTER RESEARCH REACTOR, Canada |
| 31-08-1994 | INES 1 | DAMAGE TO A SPENT FUEL ASSEMBLY DURING PREPARATORY OPERATIONS FOR REPROCESSING | MAYAK, RT-1, Russian Federation |
