[Answer] 2. What kind of disaster occurred on 26 April 1986 at Chernobyl, Ukraine?

Step 1 : Introduction to the question "2. What kind of disaster occurred on 26 April 1986 at Chernobyl, Ukraine?"

...1. Nuclear accident 2. Earthquake 3. Meteor strike 4. Flood The Chernobyl disaster (in what was then part of the Soviet Union, but is now the nation of Ukraine) was the first nuclear accident given a rating of 7 on the International Nuclear Event Scale, the highest level on the logarithmic scale used to measure the severity of such events in terms of impact on the environment. A power surge led to what is called a 'criticality accident', meaning that the chain reaction intended to produce a steady flow of power increased to the rate that causes an explosion. The steam explosion and fire caused a significant amount of radioactive material from the reactor core to be released into the environment. The event led to 56 immediate deaths, and an estimated 4000 later deaths (some groups make higher estimates - this is from the WHO) due to cancer caused by the exposure to radiation. The cities of Chernobyl and Pripyat were abandoned, the plant involved in the explosion was buried in concrete, and (in 2000) the entire facility was finally closed. Although some people still live in the area, it is estimated that the area inside the 30-km radius exclusion zone will not be safe for human occupation for another 20,000 years.

Step 2 : Answer to the question "2. What kind of disaster occurred on 26 April 1986 at Chernobyl, Ukraine?"

Nuclear accident:

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