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.
Yes, the water is not particularly radioactive. It does however contain the spent fuel rods at the bottom that are.