Industrial Disasters Essay

1623 words - 7 pages

Mistakes happen every day, and you have the privilege to learn from them or not. Some faults can result to injures or even death. In the power world, incidents occur daily, whether they are big or small. And it is very important for any power plant to correct their mistakes and prevent them from happening in the future. As the industrial disasters occur in our world, the world starts to develop regulations and policies that must be followed before performing a power production plant. This essay is going to present two major accidents that happened in the world, Three Mile Island Unit 2 and Chernobyl, and how we can learn from their mistakes.
Three Mille Island has two units, Unit one and Unit two. Unit one, owned and operated by Exelon, built in Susquehanna River, intention of producing power for the local people. It became operational in September 2, 1974. Three Mile Island Unit 2, owned by First Energy Company of Akron, became an operational plant in 1978. Babcock and Wilcox designed both Unit one and two of Three Mile Island, and build to be a pressurized water reactor. After the accident at Three Mile Island Unit 2, the plant never opened back, even though no major injuries occurred.
Three Mile Island Unit 2, located near Harrisburg, PA, had an automatic shutdown, even though the plant’s efficiency level rated about 100 percent. On March 28, 1979, one of the reactor pumps, used to supply cooling water, stopped operating, causing an automatic shutdown. This triggered an increase in pressure and temperature inside the reactor core, which resulted with a pressurized valve to open as deliberated. This released water and steam from the reactor vessel into the basement of the reactor building, trying to make reactor’s pressure a stable state. After the completion of this procedure, the pressurized valve intended to close. However, the operator’s negligent did not obtain full awareness of the valve. And the valve remained in the open position for more than two hours, which discharged the coolant water from the reactor core, departing the job of cooling the reactor before it over heats. This caused excessive heat inside the reactor. Inside the TMI control room, the instruments indicated the closing of the valve, and injection of the water to the reactor vessel was too much. The operator did not complete the following procedures, instead, they ignored the replenishing of water lost after they utilized it, and that resulted of the maintaining open position of relief value. Meanwhile, the pressure deescalated quickly, and the coolant water changed into steam making the main coolant pumps vibrate violently. Operators in the control room failed to inform the vibration prompted operator that there was a loss of coolant water in reactor, and the operator shutdown the main pumps. At the top of the reactor vessel, a large steam bubble formed preventing flow for coolant water. The loss of pressure and water created the dilemma above. Due to the lack of...

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