The fundamental cause of the accident at Chernobyl nuclear power plant is a major operational error. I think the root cause is the major mistakes in personnel operation, and the loose and inadequate emergency management and training on the eve of the accident. As a person engaged in special work in special places such as nuclear power plants, good training must be the first. Obviously, the Soviet Union did not do well in this respect. In addition, according to the declassified data, there were widespread design defects in nuclear power plants in the Soviet Union at that time, which was also a very important reason.
The remedial measures taken by the Soviet authorities came one after another, and the Soviet authorities responded quite quickly. Within a few hours after the incident, the expert group rushed to Chernobyl, and helicopters took aerial photos of the ruins to collect evidence. In a short time, the former helicopter threw thousands of tons of chemicals into the ruins regardless of nuclear radiation. Thousands of helicopters were all scrapped, and all pilots were seriously irradiated. Thousands of workers and thousands of soldiers came to build huge concrete coffins covering the whole ruins. These people lost their lives in an average of ten years.
Although the fire has been controlled, it has not stopped the spread of nuclear pollution and nuclear threat. Especially before, the fire brigade sprayed a lot of water to put out the fire and accumulated it under the reactor. If molten uranium and graphite meet water, there will be a big explosion. Scientists estimate that if all uranium is blown up, the whole of Europe will be razed to the ground. As a result, firefighters risked their lives to enter the scene and pump the water dry. In the end, all the firemen died. In addition, the Soviet government sent helicopters to throw 2400 tons of lead blocks to put out the fire. But lead will dissolve when heated, and people will be poisoned by inhaling lead, so these pilots are all dead.
As for nuclear pollution, the biggest problem is that it will seep into the ground and pollute the groundwater. So, the Soviet government dispatched 10,000 miners, dug a tunnel with a depth of 150 meters, dug another 30 meters around the furnace core, injected a lot of coolant, and then surrounded it with a layer of cement wall. In the future, a quarter of these miners will not live to be 40. Other survivors are basically riddled with various diseases.