.- A nuclear accident in Japan on Saturday was classified as less serious nuclear disaster occurred at Three Mile Island plant in 1979 and Chernobyl in 1986, said Japan's nuclear safety agency. An agency official said the problem at the nuclear plant operated by Tokyo Electric Power north of Tokyo scored 4 in the Scale International Nuclear and Radiological Event Scale (INES for its acronym in English).
In the INES scale, level 4 corresponds to no risk of accidents outside the plant site and with only a local impact, according to documents of the International Atomic Energy Agency. However, the accident at Fukushima No. 1 is the most serious that has known so far Japan. In the INES scale, level 0 corresponds to the absence of anomalies and level 7, the highest, to a major accident.
The scale uses the term anomaly for level 1 and the word incident to level 2 and 3. At level 4, the scale introduces the term accident. 
In the INES scale, level 4 corresponds to no risk of accidents outside the plant site and with only a local impact, according to documents of the International Atomic Energy Agency. However, the accident at Fukushima No. 1 is the most serious that has known so far Japan. In the INES scale, level 0 corresponds to the absence of anomalies and level 7, the highest, to a major accident.
The scale uses the term anomaly for level 1 and the word incident to level 2 and 3. At level 4, the scale introduces the term accident.
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