Which nuclear accident occurred in March 1979?

Which nuclear accident occurred in March 1979?

• A. Three Mile Island
• B. Chernobyl
• C. Fukushima
• D. Windscale

Answer: (A)

March 1979 is tied to a major nuclear accident in the United States, at Three Mile Island in Pennsylvania. A partial meltdown happened at Unit 2 after cooling-system failures and operators misread instruments, leading to a loss of coolant and melting of part of the reactor core. The release of radioactive gases was small, but the incident had a profound impact on U.S. nuclear safety—prompting sweeping changes in regulation, plant design, operator training, and emergency preparedness. For context, Chernobyl occurred in 1986 in the Soviet Union and involved a catastrophic explosion and large radiation release; Fukushima occurred in 2011 in Japan after an earthquake and tsunami, with meltdowns at several reactors; Windscale happened in 1957 in the United Kingdom and involved a reactor fire. None of these took place in March 1979, so the event associated with that date is Three Mile Island.

March 1979 is tied to a major nuclear accident in the United States, at Three Mile Island in Pennsylvania. A partial meltdown happened at Unit 2 after cooling-system failures and operators misread instruments, leading to a loss of coolant and melting of part of the reactor core. The release of radioactive gases was small, but the incident had a profound impact on U.S. nuclear safety—prompting sweeping changes in regulation, plant design, operator training, and emergency preparedness.

For context, Chernobyl occurred in 1986 in the Soviet Union and involved a catastrophic explosion and large radiation release; Fukushima occurred in 2011 in Japan after an earthquake and tsunami, with meltdowns at several reactors; Windscale happened in 1957 in the United Kingdom and involved a reactor fire. None of these took place in March 1979, so the event associated with that date is Three Mile Island.