The operator of Japan's crippled Fukushima nuclear power plant has found that a coolant solution, used to create an ice wall halting the seepage of groundwater into reactor buildings, has leaked from two storage tanks.
The leakage has had no impact on the wall or environment, said Tokyo Electric Power Co Holdings Inc (Tepco).
Still, it underscores the unpredictable challenges in the clean-up of the site, nearly 11 year after an earthquake and tsunami ravaged Japan's northeastern coast, causing the world's worst nuclear disaster since Chernobyl, Ukraine, in 1986.
