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.

In this letter the Soviet minister proposed to the Soviet government to concentrate the nuclear research in Ukrainian Institute of Physic and Technology (UIPhT) and to locate in Kharkov the nuclear scientists from Leningrad Institute of Physic and Technology because Kharkov institute had very good base for the nuclear studies. If this proposal was realized Kharkov could become more important Soviet nuclear center than Moscow or Sarov. In any case this letter of people’s commissar recognized the prominent role of the Ukrainian Institute of Physic and Technology (UIPhT) in the Soviet nuclear science.