1952 (December), Chalk River, Canada. The heart of the reactor is damaged. The accident was classified as level 5 on the INES (International Nuclear Event Scale), which comprises 7. 1957 (October), Central Windscale, United Kingdom. After an incident during a maintenance operation, the heart of the reactor caught fire, releasing large amounts of radioactive particles into the environment.
Level 5 on the INES. 1969 (October), Saint Lawrence Central, France. Fusion of several fuel elements. Level 4 on the INES. 1979 (March), at Three Mile Island, Pennsylvania, USA. Failure of water supply system results in the fusion of the heart. The enclosure is required and little radioactive elements were released.
Level 5 on the INES. 1980 (March), Central Saint-Laurent, France. Merger of two fuel elements. The reactor was damaged. Level 4 on the INES. 1986 (April), Central Lenin at Chernobyl. The heart of the No. 4 reactor melts before they explode, releasing large quantities of radioactive elements.
The fault is attributable to human error and design flaws of the plant. Level 7 on the INES is the worst nuclear accident to date. 
Level 5 on the INES. 1969 (October), Saint Lawrence Central, France. Fusion of several fuel elements. Level 4 on the INES. 1979 (March), at Three Mile Island, Pennsylvania, USA. Failure of water supply system results in the fusion of the heart. The enclosure is required and little radioactive elements were released.
Level 5 on the INES. 1980 (March), Central Saint-Laurent, France. Merger of two fuel elements. The reactor was damaged. Level 4 on the INES. 1986 (April), Central Lenin at Chernobyl. The heart of the No. 4 reactor melts before they explode, releasing large quantities of radioactive elements.
The fault is attributable to human error and design flaws of the plant. Level 7 on the INES is the worst nuclear accident to date.
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