Incident: Fukushima


INES level: 5


Year: 2011
Description: Reactor shutdown after the 2011 Sendai earthquake and tsunami; failure of emergency cooling caused an explosion

Incident: Onagawa


INES level:


Year: 2011
Description: Reactor shutdown after the 2011 Sendai earthquake and tsunami caused a fire

Incident: Fleurus


INES level: 4


Year: 2006
Description: Severe health effects for a worker at a commercial irradiation facility as a result of high doses of radiation

Incident: Forsmark


INES level: 2


Year: 2006
Description: Degraded safety functions for common cause failure in the emergency power supply system at nuclear power plant

Incident: Erwin


INES level:


Year: 2006
Description: Thirty-five litres of a highly enriched uranium solution leaked during transfer

Incident: Sellafield


INES level: 3


Year: 2005
Description: Release of large quantity of radioactive material, contained within the installation

Incident: Atucha


INES level: 2


Year: 2005
Description: Overexposure of a worker at a power reactor exceeding the annual limit

Incident: Braidwood


INES level:


Year: 2005
Description: Nuclear material leak

Incident: Paks


INES level: 3


Year: 2003
Description: Partially spent fuel rods undergoing cleaning in a tank of heavy water ruptured and spilled fuel pellets

Incident: Tokaimura


INES level: 4


Year: 1999
Description: Fatal overexposures of workers following a criticality event at a nuclear facility

Incident: Yanangio


INES level: 3


Year: 1999
Description: Incident with radiography source resulting in severe radiation burns

Incident: Ikitelli


INES level: 3


Year: 1999
Description: Loss of a highly radioactive Co-60 source

Incident: Ishikawa


INES level: 2


Year: 1999
Description: Control rod malfunction

Incident: Tomsk


INES level: 4


Year: 1993
Description: Pressure buildup led to an explosive mechanical failure

Incident: Cadarache


INES level: 2


Year: 1993
Description: Spread of contamination to an area not expected by design

Incident: Vandellos


INES level: 3


Year: 1989
Description: Near accident caused by fire resulting in loss of safety systems at the nuclear power station

Incident: Greifswald


INES level:


Year: 1989
Description: Excessive heating which damaged ten fuel rods

Incident: Goilnia


INES level: 5


Year: 1987
Description: Four people died and six received doses of a few Gy from an abandoned and ruptured highly radioactive Cs-137 source

Incident: Chernobyl


INES level: 7


Year: 1986
Description: Widespread health and environmental effects. External release of a significant fraction of reactor core inventory

Incident: Hamm-Uentrop


INES level:


Year: 1986
Description: Spherical fuel pebble became lodged in the pipe used to deliver fuel elements to the reactor

Incident: Tsuraga


INES level: 2


Year: 1981
Description: More than 100 workers were exposed to doses of up to 155 millirem per day radiation

Incident: Saint Laurent des Eaux


INES level: 4


Year: 1980
Description: Melting of one channel of fuel in the reactor with no release outside the site

Incident: Three Mile Island


INES level: 5


Year: 1979
Description: Severe damage to the reactor core

Incident: Jaslovsk Bohunice


INES level: 4


Year: 1977
Description: Damaged fuel integrity, extensive corrosion damage of fuel cladding and release of radioactivity

Incident: Chapelcross


INES level:


Year: 1967
Description: Graphite debris partially blocked a fuel channel causing a fuel element to melt and catch fire

Incident: Monroe


INES level:


Year: 1966
Description: Sodium cooling system malfunction

Incident: Charlestown


INES level:


Year: 1964
Description: Error by a worker at a United Nuclear Corporation fuel facility led to an accidental criticality

Incident: Santa Susana Field Laboratory


INES level:


Year: 1959
Description: Partial core meltdown

Incident: Chalk River


INES level:


Year: 1958
Description: Due to inadequate cooling a damaged uranium fuel rod caught fire and was torn in two

Incident: Vinca


INES level:


Year: 1958
Description: During a subcritical counting experiment a power buildup went undetected - six scientists received high doses

Incident: Kyshtym


INES level: 6


Year: 1957
Description: Significant release of radioactive material to the environment from explosion of a high activity waste tank.

Incident: Windscale Pile


INES level: 5


Year: 1957
Description: Release of radioactive material to the environment following a fire in a reactor core

Incident: Chalk River


INES level: 5


Year: 1952
Description: A reactor shutoff rod failure, combined with several operator errors, led to a major power excursion of more than double the reactor's rated output at AECL's NRX reactor