A tank at Japan’s damaged Fukushima nuclear plant has leaked another 100 metric tons of highly contaminated water, the worst incident since August.
Operator Tokyo Electric Power Co (Tepco) said Thursday that the water had overflowed late the previous day after a valve had mistakenly been left open.
“We are taking various measures, but we apologize for worrying the public with such a leak,” said Masayuki Ono, a spokesman for the utility. “Water is unlikely to have reached the ocean as there is no drainage in that tank area.”
The leak, considered a level three, or “serious incident,” on the seven-point international scale for radiological releases, adds to criticism of the utility’s response to the three nuclear meltdowns that followed the 2011 earthquake and tsunami. Last week, a nuclear regulatory official said Tepco had postponed the release of record-high measurements of highly radioactive strontium-90 in the groundwater, despite repeated requests.