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. That night, operators realized that the water pumps needed to be restarted, and the core's temperature started dropping. On the morning of July 14, 1959, Sodium Reactor Experiment trainee John Pace received the bad news. Radiation was spreading, and while the power company downplayed the accident, the governor was on the verge of issuing evacuation orders. nuclear meltdown is recalled 50 years later. FILE - The Diablo Canyon Nuclear Power Plant is seen on June 1. 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. Environmental Groups Urge Regulators to Shut Down California Reactor Over Safety, Testing Concerns. The incident, kept secret for decades, resulted in the dea. Although emergency cooling pumps kicked in, control room operators misinterpreted confusing readings from the pumps' system and shut them off. Documentary film covering the top secret 1959 Sodium Reactor meltdown in Los Angeles, California. Loss of the coolant then caused the reactor core to overheat. If radiation was released during a nuclear reactor failure and rocket. commercial nuclear power plant operating history, although its small radioactive releases had no detectable. 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. radiation exposure from the Santa Susana Field Laboratory, Simi Valley, California. This was the most serious accident in U.S. ![]() 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. After an earthquake and tsunami resulted in an accident at a nuclear power plant in Fukushima in March 2011, NOAA Fisheries tracked radiation levels in U.S.
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