Describe the Chernobyl Atomic Plant Tragedy 1986.

Chernobyl Atomic Plant Disaster (26 April 1986):

The Chernobyl Disaster at the Chernobyl Nuclear Power Plant near Pripyat (Ukrainian SSR, Soviet Union) is rated at the maximum Level 7 on the International Nuclear Event Scale (INES):

• 1. Causes of the Disaster:
  • Flawed design of the RBMK-1000 graphite-moderated reactor (positive void coefficient).
  • Flawed safety test conducted by operators who disabled automatic emergency shutdown systems, causing an uncontrollable thermal-nuclear power surge and catastrophic steam explosion rupturing the reactor core.
• 2. Catastrophic Consequences:
  • Plume of highly radioactive fission products ($Iodine ext{-}131, Cesium ext{-}137, Strontium ext{-}90$) radiated across USSR and Western Europe.
  • Permanent abandonment and creation of the 30-km Chernobyl Exclusion Zone (Pripyat ghost town); thousands of long-term cancer and thyroid fatalities among emergency liquidators and civilians.
• 3. Global Impact: Spurred worldwide nuclear safety protocols, creation of WANO, and decommissioning of flawed reactor models.