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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.

The resulting explosion destroyed the reactor building, and a fire began to burn, releasing even more radioactive material into the air. The accident was so severe that it was initially thought to be a simple industrial accident, and it wasn't until the radiation was detected by monitoring stations in Scandinavia that the true extent of the disaster became clear.

The Chernobyl disaster, which occurred on April 26, 1986, is considered one of the worst nuclear power plant accidents in history. The catastrophic event took place at the Chernobyl Nuclear Power Plant, located near the city of Pripyat in Ukraine, which was then part of the Soviet Union.

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.

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.