![]() This knowledge makes them more equipped to use their operating knowledge and plant procedures to work through and manage unusual accident scenarios. Operators are now fully trained to understand the entire physics of the system. The NRC implemented new, more stringent regulations related to improved training, emergency response planning, as well as upgrades to plant design and equipment requirements. Thorough analysis of the accident’s events led to widespread changes across the U.S. NRC Implemented Enhanced Safety & Training It was determined that very low levels could be attributed to the accident and that the radioactive release had negligible effects on the physical health of the individuals or the environment.Ĥ. Various government agencies monitoring the area collected thousands of environmental samples of air, water, milk, vegetation, soil, and foodstuffs. Months after the incident, concerns were raised about possible adverse effects from the radiation exposure on the people, animals, and plants in the areas near Three Mile Island. No adverse effects to the surrounding environment Consequently, a small amount of radioactive material was released.ģ. The malfunction and operator error resulted in inadequate cooling water circulation to the reactor core causing it to overheat and suffer a partial meltdown. Unaware that the plant was experiencing a loss of coolant accident, operators took actions that ultimately exacerbated the issue. The instrumentation incorrectly indicated to plant operators that the valve had reclosed as expected once proper pressure levels were reached. On March 28 th, 1979, equipment failures and a stuck open relief valve prevented the removal of heat from the Three Mile Island Unit 2 reactor’s core–– an essential function that prevents reactor damage. Unit 2 experienced equipment and instrumentation malfunctions The accident’s exposure had no detectable health effects on the plant workers or surrounding public.Ģ. To put this into further context, exposure from a chest X-ray is about 6 millirem. The estimated average radiation dose was about 1 millirem above the area’s natural background of about 100-125 millirem per year. Department of Energy (DOE), the Environmental Protection Agency, the Department of Health, Education and Welfare (now Health and Human Services), and the Commonwealth of Pennsylvania.Įxperts determined that the approximately 2 million people in the nearby area during the accident were exposed to small amounts of radiation. No injuries, deaths or direct health effects were caused by the accidentįollowing the event, detailed studies of the accident’s radiological consequences were conducted by the Nuclear Regulatory Commission (NRC), the U.S. ![]()
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