Qualla: Three Mile Island

Three Mile Island: Introduction

Fri, 16 Jan 2026 00:00:00 GMT

Photo credit Z22, CC BY-SA 3.0. At 4:00 AM on March 28, 1979, a series of equipment malfunctions, design flaws, and human errors triggered a partial meltdown at the Three Mile Island Nuclear Generating Station near Harrisburg, Pennsylvania. Over the following days, as officials struggled to understand what was happening inside the reactor and whether it might explode, 140,000 people fled the surrounding area. The worst nuclear accident in American history had begun. In the end, no one died directly from the accident - though health effects remain disputed. But Three Mile Island killed something else: America's faith in nuclear power. The accident transformed public opinion overnight, galvanized the anti-nuclear movement, and effectively ended new nuclear plant construction in the United States for three decades. The cooling towers of Three Mile Island became icons of technological failure, symbols of the moment when the atomic dream became a nightmare.

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Image: Z22 | CC BY-SA 3.0

Three Mile Island: The Promise of Atoms

Fri, 16 Jan 2026 00:00:00 GMT

Photo credit Unknown authorUnknown author or not provided, Public domain. Three Mile Island's Unit 1 reactor began operating in 1974, Unit 2 in 1978. They represented the fulfilled promise of nuclear power: clean, cheap electricity from atoms split in controlled reactions, the same forces that had destroyed Hiroshima now harnessed to boil water and spi...

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Image: Unknown authorUnknown author or not provided | Public domain

Three Mile Island: The Accident

Fri, 16 Jan 2026 00:00:00 GMT

Photo credit John G. Kemeny et al, Public domain. At 4:00 AM on March 28, a routine maintenance procedure caused the main feedwater pumps to stop, triggering an automatic shutdown of the reactor. But a pressure relief valve that should have closed stuck open, allowing coolant to drain from the reactor core. Operators, misreading...

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Image: John G. Kemeny et al | Public domain

Three Mile Island: The Fear

Fri, 16 Jan 2026 00:00:00 GMT

Photo credit Unknown authorUnknown author or not provided, Public domain. The public learned about the accident through confused and contradictory announcements. Plant owners initially downplayed the severity. State officials didn't know what to believe. The Nuclear Regulatory Commission's advice evolved hourly. On March 30, Governor Richard Thornburgh...

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Image: Unknown authorUnknown author or not provided | Public domain

Three Mile Island: The Aftermath

Fri, 16 Jan 2026 00:00:00 GMT

Photo credit John G. Kemeny et al, Public domain. The physical cleanup of Three Mile Island took fourteen years and cost nearly $1 billion. Workers in protective suits slowly removed the melted fuel, confirming that about half the core had liquefied. The containment building had held; the worst-case scenario hadn't occurred. Stu...

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Image: John G. Kemeny et al | Public domain

Three Mile Island: Visiting Three Mile Island

Fri, 16 Jan 2026 00:00:00 GMT

Photo credit Governor Tom Wolf from Harrisburg, PA, CC BY 2.0. Three Mile Island lies in the Susquehanna River south of Harrisburg, Pennsylvania. The plant is not open to public tours - Unit 2 remains a secured radiological site. However, the distinctive cooling towers are visible from multiple vantage points along the river and Route 441. T...

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Image: Governor Tom Wolf from Harrisburg, PA | CC BY 2.0