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Remembering Three Mile Island

GIL SCOTT HERON – WE ALMOST LOST DETROIT (LIVE AT 98.3 SUPERFLY)

This Day in History: America’s Worst Nuclear Fears Realized at Three Mile Island Plant, VOA, 28 Mar 17, Thirty-eight years ago today — March 28, 1979 — disaster struck at 4 a.m. at the Three Mile Island (TMI) nuclear power plant in central Pennsylvania after its cooling system failed.

It remains the worst nuclear accident in American history. A simple plumbing failure prevented the main feedwater pumps from sending water to generators that remove heat from the plant’s core reactor.

During those pre-dawn hours, the temperature of the reactor rose steadily even as staffers were unaware that a valve in the emergency cooling system had become stuck in place, allowing cool water to flow through the valve — not reaching the reactor.

Instruments in the control room misled operators, who thought the cooling system was working normally.

As coolant flowed from the primary system through the valve, other instruments available to reactor operators provided inadequate information. There was no instrument that showed how much water covered the core. As a result, plant staff assumed that as long as the pressurizer water level was high, the core was properly covered with water.

As alarms rang and warning lights flashed, the operators did not realize that the plant was experiencing a loss-of-coolant accident — or, rather, the beginnings of a nuclear meltdown. And just after 6:00 am, data indicated the core reactor had overheated so much that radiation was detected inside the control room.

Half the core was later found to have melted………

In the months following the accident, questions were raised about possible adverse effects from radiation on human, animal and plant life around the nuclear power plant, although none could be directly correlated to the accident.

Thousands of environmental samples of air, water, milk, vegetation, soil and foodstuffs were collected by various government agencies monitoring the area.

In 1997, researchers from Environmental Health Perspectives, the journal of the U.S. National Institute of Environmental Health Science concluded increases in lung cancer and leukemia near the Pennsylvania plant suggested a much greater release of radiation during the 1979 accident than had been believed.

Three Mile Island Health Effects

The accident sparked sweeping safety regulations. The damaged reactor, on the Susquehanna River near Harrisburg, was never restarted. No new commercial nuclear power plant was licensed by the federal government until 2012….http://www.voanews.com/a/americas-worst-nuclear-fears-realized-at-three-mile-island-plant-in-1979/3784186.html

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March 29, 2017 - Posted by | safety, USA

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