The document describes the accident which took place at Chernobyl nuclear power plant prior to 1986 disaster. The information on the accident which took place on 9 September 1982 was classified. The document demonstrates that before the Chernobyl disaster the Soviet government knew about the deficiences of the Chernobyl nuclear power plant.

This document describes the deficiencies which were made in activities aimed at overlapping of Chernobyl disaster’s consequences. These deficiencies could lead to new victims because the security rules of handling with dangerous radioactive materials were broken.

Radiation levels in Pripyat and the surrounding area following the Chernobyl nuclear disaster.

Physicists at the Academy of Sciences give advice for containing the Chernobyl nuclear disaster.

This KGB report provides a chronology of the Chernobyl nuclear disaster, and gives information on the disaster's first victims.

The Soviet Minister of Power and Electrification reports on an explosion and fire at the Chernobyl Atomic Power Station in Ukraine. The Soviet Ministry of Heath has determined that "it is not required to take special measures, including the evacuation of the population from the city."