![]() Two days later, however, a hydrogen gas bubble was discovered from the partially melted reactor, but crews were able to bleed the gas before the reactor reheated. It sits on the country's east coast, about 220km (137 miles) north-east of the capital Tokyo. That night, operators realized that the water pumps needed to be restarted, and the core's temperature started dropping. The Fukushima Daiichi Nuclear Power Plant is in the town of Okuma, in Fukushima Prefecture. Radiation was spreading, and while the power company downplayed the accident, the governor was on the verge of issuing evacuation orders. Analysis of loss of coolant accident without ECCS and DHRS in an integral pressurized water reactor using. The reactor was also shut down, but decay heat continued to be released, and by the following morning, the core was nearing total meltdown temperature. Although emergency cooling pumps kicked in, control room operators misinterpreted confusing readings from the pumps' system and shut them off. Total loss of coolant led to a power excursion and explosion of experimental reactor. Loss of the coolant then caused the reactor core to overheat. The explosions and nuclear fuel rods melting at Japan's Fukushima nuclear power plant. The accident occurred when a pressure valve in one of the reactors malfunctioned, failing to close and allowing contaminated cooling water to drain into the adjoining buildings. A nuclear meltdown happens when the reactors residual power exceeds the heat that can be removed by the cooling systems. The partial March 1979 meltdown at Pennsylvania's Three Mile Island power plant was the most serious nuclear accident to occur in the U.S., according to History. Unfortunately, when the pressure in the reactor decreased, the valve failed to completely close resulting in a small break loss of coolant accident (SBLOCA).
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