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Three Mile Island Accident from Nuclear Power Plant Near Middletown Pennslyvania
Transcript of Three Mile Island Accident from Nuclear Power Plant Near Middletown Pennslyvania
from Nuclear Power Plant
Near Middletown, PA Cooling Tower Reactor Building A cooling tower is a device which takes waste heat into the atmosphere through a cooling of a water stream.
They provide cooled water for air conditioning, manufacturing and electric power generation. A building that contains a nuclear reactor. The accident began at 4:00 a.m. on March 28, 1979, when the plant had a failure in the secondary, non‑nuclear section of the plant.
The main feedwater pumps stopped running, because of a mechanical or electrical failure, whichstopped the steam generators from removing heat.
First the turbine, then the reactor suddenly shut down.
Immediately, the pressure in the primary system began to rise.
In order to prevent that pressure from becoming too much, the pilot-operated relief valve opened. The valve should have closed when the pressure fell by a certain amount, but it did not.
Signals available to the operator failed to show that the valve was still open. As a result, cooling water poured out of the stuck-open valve and caused the core of the reactor to overheat. What Happened? Interview about the Disaster Health Affects Not much radiation was exposed to the community in the area.
Many samples of air, water, milk, vegetation and soil were taken and tested and only a small amount of radionuclides were present, which comes to conclude that everyone in the area of the accident was not harmed Voices from the Disaster Impact of the Accident Timeline of Events that happened after accident July 1980 Approximately 43,000 curies of krypton were vented from the reactor building.
July 1980 The first manned entry into the reactor building took place.
Nov. 1980 An Advisory Panel composed of citizens, scientists, state and local officials, held its first meeting in Harrisburg, PA.
July 1984 The reactor vessel head was removed.
Oct. 1985 Defueling began.
July 1986 The off-site shipment of reactor core debris began.
Aug. 1988 GPU submitted a request for a proposal to amend the TMI-2 license to a possesion only license and to allow the facility to enter long-term monitoring storage.
Jan. 1990 Defueling was completed.
July 1990 GPU submitted its funding plan for placing $229 million in escrow for radiological decommissioning of the plant.
Jan. 1991 The evaporation of accident-generated water began.
April 1991 NRC published a notice of opportunity for a hearing on GPU's request for a license amendment.
Feb. 1992 NRC issued a safety evaluation report and granted the license amendment.
Aug. 1993 The processing of 2.23 million gallons accident‑ generated water was completed.
Sept. 1993 NRC issued a possession-only license.
Sept. 1993 The Advisory Panel for Decontamination of TMI-2 held its last meeting.
Dec. 1993 Post-Defueling Monitoring Storage began. Changes that have Occured due to Accident Had to upgrade plant design and equipment
Improved controls for opperating the plant
Regular inspection of plant performane by senior NRC managers The accident was caused by a combination of personnel error, design deficiencies, and component failures.
The accident at Three Mile Island changed both the nuclear industry and the NRC.
Public feared of what was going to happen, NRC’s regulations became more strict and management of the plants was watched more carefully.