Three Mile Island - The Disaster (cont.)

Three Mile Island - The Disaster (cont.)

• When the steam generators boiled dry standby pumps began to operate, as they should
  • Operators turned down the flow thinking enough coolant was available - kept problem growing.
• Practically an accidental turning on of the standby pumps by a supervisor averted the accident.

• Human intervention was primary cause of accident
• The Human Error was principally due to design of the control room

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