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April 26th, 1986, Chernobyl Nuclear Disaster

April 26th, 1986, Chernobyl Nuclear Disaster On April 26th, 1986, occurred one of the most catastrophic nuclear accidents in history, classified as grade 7 - "very serious" in the International Nuclear Emergency Scale (INES scale) when the Chernobyl Nuclear Power Plant (Chernobyl), Ukraine (former USSR) reactor No. 4 of the type called RMBK-1000 explodes.
 
This event shocked the world because it is considered the worst ecological and human tragedy of all time, whose consequences nowadays are experienced by residents of neighboring areas.
 
The affected area is greater than 130 000 km2 only in Ukraine. For the date of the accident, the entire population within a radius of 30 km was evacuated to the round area (known as exclusion zone) and relocated in different nearby areas.
 
This accident, with the worst environmental consequences serves as a reference to project into the future and control all nuclear devices and systems; and that is why in the following years, a “sarcophagus” was built with metallic lead structures to avoid the dispersion of the remains of reactor Number 3 and the explosive Number 4 and thus avoid the emission of the radioactivity they still generate. It was one of the most complex constructions in the world because of the radioactivity and structure itself.

The recovery of the zone of the accident and the cleaning products used, has left behind a large number of radioactive debris and contaminated equipment that are stored in close to 800 places in and out of the exclusion zone. They are temporarily stored in containers or buried in trenches that can cause the risk of further contamination of underground waters and land, and because of this all food production from this area had to be stopped.

Today, there are still risks associated with the possible collapse of the sarcophagus given its decay in the years after the accident. The Vienna Convention celebrated in 1996 pointed out the need to investigate and design an adequate system of confinement from an ecological perspective, avoiding filtrations from rain water in the interior and stop the sinking of the current sarcophagus which would allow the escape of radioactive dust and the rest of the fuel into the environment.

Did you know that?
Even when exists a sarcophagus over the reactor number 3 and 4, on April, 2012, started the construction of a new one in ark shape, which will be completed by 2015, aim to avoid problems of radioactive leak for almost 100 years.