A blackout roils the plant as the air fills with dust and graphite chunks, and radiation begins spewing out. Patrick Landmann/Getty Images An Unexpected Power Surge Triggers DisasterĪpril 26, 1986, 1:23:04 a.m.: The test officially begins, and an unexpected power surge occurs.Īpril 26, 1986, 1:23:40 a.m.: An operator presses the emergency shutdown button, but the control rods jam as they enter the core.Īpril 26, 1986, 1:23:58 a.m.: The first explosion, to be quickly followed by at least one more, blows the 1,000-ton roof right off the reactor and shoots a fireball high into the night sky. Reactor unit 4 was the one that blew up on April 26, 1986. The control panel of reactor unit 4 inside the Chernobyl exclusion zone and nuclear power plant in 2006.
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