On this day in labor history, the year was 1979.
That was the day The Three Mile Island Unit 2 reactor partially melted down near Middleton, Pennsylvania.
A combination of equipment failure and human error has long been attributed as the cause of the meltdown.
An initial overheating and reactor shut down had occurred.
But a pressure valve remained stuck open, allowing coolant to escape.
Design flaws in control equipment failed to indicate the position of the valve.
Workers then mistook the increased pressure as a result of excessive coolant.
They shut off the emergency water system that could have cooled the core.
Fears of radiation release and hydrogen bubbles led to voluntary evacuations that included over 140,000 residents.
Authorities assured the public that the partial meltdown had been contained.
President Carter convened a commission to investigate the causes.
It concluded that while the operators took inappropriate actions, the training they received was inadequate as were the procedures they were required to follow.
Plant designers, Babcock and Wilcox were held responsible for poor design.
The company failed to notify operators of repeated valve failure and a previous near duplicate of the potential catastrophe at the Davis-Besse plant.
Metropolitan Edison, General Public Utilities and the NRC were also held responsible for poor quality control, poor maintenance, communication lapses and poor training.
Fears regarding public health and safety intensified, fueling health studies of those exposed and the anti-nuclear power movement.
The aftermath brought about sweeping changes involving emergency response planning, reactor operator training, human factors engineering, radiation protection, and many other areas of nuclear power plant operations.
It also caused the NRC to tighten and heighten its regulatory oversight. All of these changes significantly enhanced U.S. reactor safety.
April 2 - Trouble in the Sweetest Place on Earth
April 1 - The Promise of 1946
March 31 - Hospital Workers Stand United
March 30 - 15th Amendment Adopted
March 29 - West Coast Hotel v Parrish Decided
March 27 - FE Strikers Battle Police at Harvester
March 26 - Police Attack UE Amid ‘46 Strike Wave
March 25 - Centralia Coal Mine #5 Explodes
March 24 - Exxon Valdez Runs Aground
March 23 - Texas City Refinery Explosion Kills 15
March 22 - ERA Passes the Senate
March 21 - Truman Signs Loyalty Order
March 20 - Another Deadly Explosion
March 19 - Wartime President Pushes for Labor Peace
March 18 - Wartime Workers Betrayed
March 17 - The Hoggs Hollow Tragedy
March 16 - Big Bill Haywood Talks General Strike
March 15 - The Grapes of Wrath Opens in Theaters
March 14 - Remembering Walter Crane
Create your
podcast in
minutes
It is Free
Navigating Life After 40
Teaching Learning Leading K-12
Regenerative Skills
The Jordan B. Peterson Podcast
The Mel Robbins Podcast