Who Destroyed Three Mile Island?

on YouTube ↗37m

" summary

A minute-by-minute reconstruction explains why operators switch off emergency cooling: misread pressurizer level, a stuck pilot-operated relief valve, a delayed block-valve closure, and overloaded alarms; timeline shows core exposed by ~2/3 and about 20 tons of melted uranium with cleanup costing over $1 billion and taking decades; root causes are training, instrument design, and procedures; recommends systems thinking, blameless post-mortems and human-factors fixes that actually reduced risk.

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" chapters (15)

1. 0:00Start
2. 0:53How a Nuclear Reactor Generates Power
3. 2:02Basic Mechanics of a Nuclear Power Plant
4. 2:45Families of Nuclear Reactors
5. 2:59Pressurized Water Reactor
6. 7:38Schematic of Three Mile Island Unit Two
7. 9:41The Pressurizer
8. 10:58The Pilot-Operated Relief Valve Opens
9. 24:34Hindsight Bias
10. 25:04Outcome Bias
11. 31:31Why Did the Crew Not Respond When the Sump Alarm Went Off
12. 32:35Alarm Printer
13. 33:50Understand Why It Made Sense
14. 34:16Seek Forward Accountability
15. 34:30Holding People Accountable