The Chernobyl disaster was a catastrophic nuclear accident that took place between April 25 and 26, 1986 at the No. 4 nuclear reactor at the Chernobyl Nuclear Power Plant near the city of Pripiat in northern Soviet Ukraine, close to the border with Soviet Belarus.
What is the AZ 5 button?
At 01:23 the operators pressed the AZ-5 (Rapid Emergency Defense 5) button which ordered a full insertion of all control rods, including the manual control rods that had previously been carelessly withdrawn.
With this information, we can conclude that the AZ-5 is the Rapid Emergency Defense 5.
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