3 Mile Island Meltdown

The Three Mile Island incident on May 28, 1979, was a significant nuclear accident in Pennsylvania. Although smaller than other nuclear disasters, it highlighted how minor errors can lead to major consequences. The incident involved construction delays, operational issues, and a series of equipment failures, leading to a partial meltdown. The response was delayed, and the aftermath included a lengthy cleanup process. Despite the severity, no health effects were reported among residents. The incident underscored the importance of nuclear safety and regulatory oversight.

What year did the Three Mile Island incident occur?

• 1986

• 1979

• 1969

• 2011

Which unit at Three Mile Island was plagued with issues during construction?

• Unit 4

• Unit 3

• Unit 2

• Unit 1

What action did workers take to avoid the shutdown of Unit 2?

• Improved safety measures

• Falsified performance data

• Increased power output

• Replaced faulty equipment

What was the initial technical failure that led to the meltdown?

• A stuck relief valve

• A failed feedwater pump

• A power surge

• A broken turbine

What was the consequence of the stuck relief valve during the incident?

• Increased water levels

• Continuous steam venting

• Immediate shutdown

• Power surge

What human error contributed to the worsening of the meltdown?

• Ignoring safety protocols

• Misreading control panel indicators

• Overloading the reactor

• Delaying maintenance

What did workers mistakenly believe about the reactor's condition?

• It was completely shut down

• It was overheating

• It was operating normally

• It was filled with water

How long did it take for officials to inform residents about the incident?

• Immediately

• One day

• Two days

• A week

What was the long-term impact on Unit 2 after the incident?

• It was upgraded

• It was permanently shut down

• It continued to operate

• It was relocated

Why was Unit 1 eventually shut down in 2019?

• Technical failures

• Environmental concerns

• Public opposition

• Financial reasons