Chernobyl Disaster

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On April 26, 1986, Unit 4 at the Chernobyl nuclear power plant suffered catastrophic steam and hydrogen explosions during a turbine-rundown test, releasing at least 5% of its 192-tonne reactor core (~14 EBq total radioactivity). It remains the only accident in commercial nuclear power history where radiation-related fatalities occurred, catalyzing global nuclear safety culture and international conventions. Reactor Physics Flaw: The Soviet RBMK-1000 possessed a 'positive void coefficient' at low power and control-rod tip design flaws that caused a massive power surge when operators initiated emergency shutdown. Radiological & Evacuation Scale: Pripyat (45,000 residents) was evacuated on April 27; 116,000 people within 30 km were evacuated by May 14, and ~350,000 total were eventually evacuated or resettled across a 4,300 sq km exclusion zone. Two plant workers died in the initial explosions and 28 emergency workers/firemen died within weeks from acute radiation syndrome (ARS) out of 134 confirmed ARS cases. UNSCEAR (2018) estimated ~5,000 of ~20,000 thyroid cancer cases (1991–2015) in patients aged <=18 in 1986 were 'probably' radiation-attributable (15 fatal cases 1991–2005), while a 2021 Science study found no transgenerational genetic mutation increase.

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