"Tokyo Electric Power Co. has started taking measures to contain highly radioactive groundwater at the Fukushima No. 1 nuclear plant, but its strategy is based on a theory that is disputed by industry experts."
"TEPCO insists that recently detected radioactive substances originated during the early stages of the disaster in 2011, and it is setting up barriers near the area of the initial water leak problems.
However, even the Nuclear Regulation Authority (NRA) says it is currently impossible to pinpoint where the latest leaks are coming from. Some say the leakage could be anywhere within the intricate system to cool the melted reactors and the underground maze of pipes at the plant site.
The utility’s measures, intended to prevent the underground radioactive water from spilling into the sea, could end up exacerbating the problem, some experts have warned."