Chernobyl - the destruction on April 26, 1986 of the fourth power unit of the Chernobyl nuclear power plant located on the territory of the Ukrainian SSR (now Ukraine). The destruction was explosive, the reactor was completely destroyed, and a large number of radioactive substances were emitted into the environment. The accident is regarded as the largest in its kind in the history of nuclear energy, both in terms of the estimated number of people killed and affected by its consequences, and economic damage. During the first three months after the accident, 31 people died; the long-term effects of irradiation, identified over the next 15 years, have caused the deaths of 60 to 80 people. 134 people suffered radiation sickness of one degree or another. More than 115 thousand people from the 30-kilometer zone were evacuated. To eliminate the consequences, significant resources were mobilized, more than 600 thousand people participated in the elimination of the consequences of the accident .
https://ru.m.wikipedia.org/wiki/АвариянаЧернобыльской_АЭС