20 August to 20 September 1986.

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20 August

A full report on the cause of the accident was submitted (in Russian) to the International Atomic Energy Agency (IAEA). It states there was an extraordinary sequence of carelessness, mismanagement, and violations of safety codes leading to the accident.


18 September

Galsjo Forest elk hunters fill a quarry in Northern Sweden with carcasses contaminated with radioactivity


20 September

The Soviet Union has paid out $3 billion, mainly for relocation, compensation, and loss of power.



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