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INES scale (International Nuclear Event Scale) represents internationally accepted way of classification of events (deviations, accidents and disasters) in nuclear facilities. A cooperation has been developed between the International Atomic Energy Agency from Vienna (IAEA) and the Nuclear Energy Agency of the Organization for Econmic Cooperation and Development (OECD-NEA). The main purpose of introducing the INES scale is to make easier the communication between experts, journalists and public.
The scale classifies all the events inside nuclear facilities that might cause decrease of the level of safety. INES is a scale of eight degrees (0-7). Degree 0 stands for events that do not influence the level of nuclear safety. The disaster of the nuclear power plant Chernobyl was classified as 7th degree, and the one on Three Mile Island as 4th degree. Classification is carried out regarding three criteria:
From the description of the single degrees of the INES scale follows that application of the countermeasures should be considered in cases of events classified as events of the fourth or higher degrees (events with influence on the environment).
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In case of a nuclear emergency it is very important to ensure understanding between experts and the public |
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