August 5, 2013 – JAPAN – Highly radioactive water seeping into the ocean from Japan’s crippled Fukushima nuclear plant is creating an “emergency” that the operator is struggling to contain, an official from the country’s nuclear watchdog said on Monday. This contaminated groundwater has breached an underground barrier, is rising toward the surface and is exceeding legal limits of radioactive discharge, Shinji Kinjo, head of a Nuclear Regulatory Authority (NRA) task force, told Reuters.
Countermeasures planned by Tokyo Electric Power Co are only a temporary solution, he said. Tepco’s “sense of crisis is weak,” Kinjo said. “This is why you can’t just leave it up to Tepco alone” to grapple with the ongoing disaster. “Right now, we have an emergency,” he said. Tepco has been widely castigated for its failure to prepare for the massive 2011 tsunami and earthquake that devastated its Fukushima plant and lambasted for its inept response to the reactor meltdowns. It has also been accused of covering up shortcomings.
It was not immediately clear how much of a threat the contaminated groundwater could pose. In the early weeks of the disaster, the Japanese government allowed Tepco to dump tens of thousands of metric tons of contaminated water into the Pacific in an emergency move. The toxic water release was however heavily criticized by neighboring countries as well as local fishermen and the utility has since promised it would not dump irradiated water without the consent of local townships. “Until we know the exact density and volume of the water that’s flowing out, I honestly can’t speculate on the impact on the sea,” said Mitsuo Uematsu from the Center for International Collaboration, Atmosphere and Ocean Research Institute at the University of Tokyo.
“We also should check what the levels are like in the sea water. If it’s only inside the port and it’s not flowing out into the sea, it may not spread as widely as some fear.” Tepco said it is taking various measures to prevent contaminated water from leaking into the bay near the plant. In an e-mailed statement to Reuters, a company spokesman said Tepco deeply apologized to residents in Fukushima prefecture, the surrounding region and the larger public for causing inconveniences, worries and trouble.
The utility pumps out some 400 metric tons a day of groundwater flowing from the hills above the Fukushima Daiichi nuclear plant into the basements of the destroyed buildings, which mixes with highly irradiated water that is used to cool the reactors in a stable state below 100 degrees Celsius. Tepco is trying to prevent groundwater from reaching the plant by building a “bypass” but recent spikes of radioactive elements in sea water has prompted the utility to reverse months of denials and finally admit that tainted water is reaching the sea.
In a bid to prevent more leaks into the bay of the Pacific Ocean, plant workers created the underground barrier by injecting chemicals to harden the ground along the shoreline of the No. 1 reactor building. But that barrier is only effective in solidifying the ground at least 1.8 meters below the surface. By breaching the barrier, the water can seep through the shallow areas of earth into the nearby sea. More seriously, it is rising toward the surface – a break of which would accelerate the outflow. “If you build a wall, of course the water is going to accumulate there. And there is no other way for the water to go but up or sideways and eventually lead to the ocean,” said Masashi Goto, a retired Toshiba Corp nuclear engineer who worked on several Tepco plants. “So now, the question is how long do we have?” –Reuters
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