Water from the fuel pools at the top floors of the No. 7 and No. 2 reactors at the Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture spilled over due to strong earthquakes, Tokyo Electric Power Company Holdings, Inc. announced Monday. No damage or leakage out of the buildings was confirmed.
This is water you could literally swim in (provided you don’t get close to the fuel) and only 14 litres was spilled, within the containment building. Relax