The AZ-5 Button: How a Safety Test Destroyed Reactor Four
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The AZ-5 Button: How a Safety Test Destroyed Reactor Four
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Letto da:
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Di:
(00:00:52) The test that shouldn't have been run
(00:02:18) Falling power and a fatal decision
(00:03:54) One twenty-three AM
(00:05:30) The men who walked into it
(00:07:15) What the plant management knew and didn't say
(00:08:30) Pripyat waits
(00:09:51) The graphite fire and the ten-day battle
(00:11:10) The weight of what followed
At 1:23 AM on April 26, 1986, a routine safety test at the Chernobyl Nuclear Power Plant triggered a catastrophic chain of events that would expose millions to radiation and help bring down the Soviet Union. Episode seven goes inside that night — the decisions, the design flaws, and the men who couldn't yet know what they were walking into.
The explosion that destroyed Reactor Four was not a random mechanical failure. It was the product of a delayed test, an undertrained night shift, a xenon-poisoned core, and a fatal design flaw in the RBMK reactor itself. When operators pressed the emergency shutdown button — AZ-5 — graphite-tipped control rods briefly boosted reactivity before they could slow it. Within three seconds, the reactor surged to thirty times its rated output. The 1,500-ton reactor lid was blown off the building entirely.
This episode reconstructs the sequence in forensic detail: the power crash that should have ended the test, the shift manager's decision to continue, the positive void coefficient that made a low-power reactor a powder keg, and the two explosions that opened the core to the sky. Then the firefighters arrived — before 2 AM, with no protective equipment, with no idea they were walking through a radioactive field that would kill several of them within weeks.
Drawing on personnel logs, Soviet-era inquiry records, and post-Soviet testimony, this chapter places you in the control room and on the roof in the minutes that changed nuclear history. If you want to understand how Chernobyl actually happened — not the mythology, but the mechanics — this is the episode.
This episode includes AI-generated content.
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