Tokyo Electric Power Co. has issued another correction for groundwater radiation at the Fukushima No. 1 nuclear complex and now says that it's only a tenth of what it announced earlier this month.

The correction Wednesday was the second the beleaguered utility has issued for groundwater data. Tepco is locked in a battle with water and is desperately seeking fishermen's consent to divert or dump the least-tainted portions of it into the Pacific Ocean to prevent it from mixing with highly radioactive water accumulating in the reactor buildings.

When it runs out of storage space, the tainted water will flood the premises and the environment, making the decommissioning process incredibly difficult.