![]() READ MORE: Chernobyl Timeline: How a Nuclear Accident Escalated to a Historic Disasterģ:37 p.m.: With flooding having destroyed the generator’s backup batteries, Unit 1 loses DC power as well. Without the regular flow of cooling water, a meltdown will inevitably follow. In five of the six reactors, AC power is lost without the power, water pumps can’t provide the steady flow of cool water to the reactors’ intensely hot cores. It destroys seawater pumps, drowns power panels that distribute energy to water pumps, and surges into basements where backup generators are housed. The first wave arrives at the Fukushima Daiichi Nuclear Power Plant in the form of a 13-foot-high wave, which is deflected by a sea wall built to withstand waves up to 33 feet high.ģ:35 p.m.: A second wave, this one over 50 feet high, breaches the wall. The earthquake has a magnitude of 9.1, making it the largest earthquake in Japan’s history-and one of the five most powerful earthquakes globally recorded since modern record-keeping began.ģ:27 p.m.: The earthquake sets off a tsunami. March 11, 2011: An Earthquake Precipitates CrisisĢ:46 pm: The westward moving Pacific Plate, an oceanic tectonic plate, lurches downwards beneath the Okhotsk plate along the Japan Trench, causing an earthquake 43 miles off the northeastern coast of Honshu, Japan’s most populous island. A broken picture frame lies in the mud within the exclusion zone, about 12 miles (20 kilometers) away from Fukushima Nuclear Power Planton Apin Minamisoma, Fukushima Prefecture, Japan.
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