Abstract
On April 26, 1986, an accident occurred at Unit 4 of the Chernobyl' nuclear plant which destroyed the core of the reactor and portions of the building which housed it. The ceiling and walls of the central room, the ceilings of the RCP motor rooms, the separator areas, and the ventilation centers, and the deaeratior stack roof were all destroyed. The reactor sump and its adjoining area were choked with destroyed structural members, equipment, piping, and pieces of metal. Fragments of structural members tore through the roof of the engine room and damaged girders. The magnitude of the accident was increased by a fire. Radioactive gases and airborne radionuclides were released into the atmosphere. Severe radiation conditions arose. The maximum y-radiation intensity in the area of the destroyed unit ranged from single digits to hundreds of roentgens per hour. The destroyed unit constituted an inaccessible, lifeand health-threatening powerful source of radiation and airborne radioactive contamination (Fig. I).
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