International Nuclear Event Scale (INES)

The International Nuclear Events Scale (INES) is used for facilitating rapid communication to the media and the public regarding the safety significance of events at all nuclear installations associated with the civil nuclear industry, including events involving the use of radiation sources and the transport of radioactive materials. Events are classified on the scale at seven levels: levels 4–7 are termed “accidents” and levels 1–3 “incidents”. Events without safety significance are termed “deviations” and are classified below scale at level 0. Events without relevance to radiological or nuclear safety are termed “out of scale”.

INES leaflet (57 kb)

INES User Manual (430 kb)

Clarification for the Rating of Fuel Damage Events (430 kb)

INES Additional Guidance for the Rating of Transport of Radioactive Materials and Radiation Source Events (42 kb)

 

For further information please contact the INES contact point



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