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The damaged reactor was encased in a concrete sarcophagus to prevent further radioactive material from escaping. A new containment structure, the New Safe Confinement, was built over the old sarcophagus and was completed in 2017.

The Chernobyl Nuclear Power Plant was a RBMK (Reaktor Bolshoy Moshchnosty Kanalny) type reactor, designed to generate electricity for the Soviet grid. The plant had four reactors, with Reactor 4 being the site of the disaster. On the night of April 25, 1986, a safety test was being conducted on Reactor 4 to determine how long the turbines would keep spinning and generating electricity in the event of a loss of power to the main cooling pumps. chernobyls012160puhdblurayx26510bithdrmem upd

During the test, a combination of human error and design flaws led to a power surge, causing the reactor to overheat. The reactor's power output began to increase rapidly, and the operators made a series of critical errors, including turning off important safety systems. At 1:23 a.m. on April 26, the reactor's fuel rods ruptured, releasing a massive amount of radioactive material into the atmosphere. The damaged reactor was encased in a concrete