![]() Unfortunately, the subsequent tsunami destroyed all the emergency power supplies, except that of Unit 6, due to several severe damages such as the flooding of the emergency generators. ![]() The emergency diesel generator systems and batteries automatically supply electricity to maintain the cooling system of the reactors and the spent fuel pools of each unit. However, the collapse of the offsite power transmission line tower by the earthquake led to loss of electricity in FNPP1. Operations at Unit 1 through 3 were shut down automatically due to the earthquake. Unit 1, 2, and 3 of the FNPP1 was in operation, while Unit 4, 5, and 6 were undergoing a periodic inspection on the day the earthquake occurred. There were six reactors in FNPP1, which was operated by the Tokyo Electric Power Company (TEPCO). The Fukushima Dai-ichi nuclear power plant (FNPP1) and Fukushima Dai-ni nuclear power plant (FNPP2) located on the Pacific coast of Fukushima Prefecture was destroyed in the tsunami. The Great East Japan Earthquake is a complex disaster that entailed an earthquake, a tsunami, and a nuclear accident. ![]() In normal conditions, the heat is removed through coolant injection, using large amounts of circulating water in the reactor, which stabilizes the temperature of the water within the reactor below 100☌. The steam is then cooled by a condenser and turned back into water. The decay heat of radionuclides in the reactor turns water into steam, which is utilized to generate electricity. Naoki Kunugita, in Encyclopedia of Environmental Health (Second Edition), 2019 Accident at the Fukushima Nuclear Power PlantĪ nuclear power plant consists of nuclear reactor fuel, control rods, moderators, pressure and primary containment vessels, coolants, and containment units.
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