We have confirmed through assessments that our reactor buildings are robust enough to survive an earthquake approximately 1.5 times the size of the Great East Japan Earthquake. Therefore, we feel there is little chance that fuel debris or spent fuel inside the reactor buildings could be affected by the earthquake.
In order to reduce the risk of having decommissioning delayed by an outer-rise tsunami or a tsunami originating in the Kuril–Kamchatka Trench, for which the potential of occurrence is quite high, we have built a seawall to prevent flooding 8.5m (T.P.* 8.5m) above sea level, where a lot of decommissioning-related equipment is positioned. Although there is little chance that a tsunami the size of the great East Japan Earthquake and Tsunami (3.11 tsunami) will occur, we have implemented various countermeasures, such as waterproofing openings in buildings, to prevent the accumulated water in buildings from being dragged out by tsunami drawback, and prevent an increase in the water accumulated in buildings by preventing them from being flooded by a tsunami as much as possible. Furthermore, in preparation for a tsunami that exceeds the size of the 3.11 tsunami, we are treating accumulated water in buildings and relocating it to high ground in addition to planning to also relocate highly concentrated sludge from decontamination equipment to high ground. And, we are planning to construct a new seawall as a countermeasure for the Japan trench tsunami, which the Cabinet Office deemed to be highly likely in 2020. Furthermore, in preparation for a loss of function of dynamic components caused by an earthquake or tsunami, we relocated portable equipment such as fire trucks, power supply trucks, heavy machinery, and concrete pump trucks, etc., to high ground.
*T.P.: Tokyo Peil (Mean sea level of Tokyo Bay)
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