The Chernobyl Nuclear Disaster
By the end of April it will have been 31 years since the accident at the Chernobyl Nuclear Power Plant occured.
A night power-failure stress test, at the no. 4 reactor, resulted in uncontrolled reaction conditions and subsequent steam explosion followed by an open-air fire.
This fire caused updrafts for 9 days.
Large quantities of radioactive isotopes were dispersed into the atmosphere.
Despite the 30 kilometres long radioactive exclusion zone there are some people, called samosely, who decided to remain there.
stress test: a test to show how strong something (system, health) is.
updraft: an upward movement of air.