Re-criticality? Contaminated water at the Fukushima Daiichi, 2.3 billion Becquerel detection TEPCO to study

Re-criticality? Contaminated water at the Fukushima Daiichi, 2.3 billion Becquerel detection TEPCO to study

The 27th, TEPCO announced from water taken from galleries such as the cable at the Fukushima Daiichi nuclear power plant Unit 2 sea side passes, radioactive cesium of high concentration of 2.3 billion 50 million becquerels per liter has been detected. Potentially contaminated water flows immediately after the accident has accumulated is high.

TEPCO has detected Collect the contaminated water on the 26th. Cesium-134 is 750 million becquerels, cesium-137 was included 1.6 billion Becquerel. Radioactive substances that emit beta radiation, such as strontium were also 750 million becquerels detection. Concentration of approximately at the level was detected immediately after the accident.

TEPCO described as "believes contaminated water of high concentration and is ready to have remained in the mine shaft". However, there is also a possibility that leaked in the basement of the neighborhood, as well as examine in detail the future, to promote the construction solidify the ground so that it does not leak into the sea.
http://www.asahi.com/national/update/0727/TKY201307270078.htm

It is said with feigned ignorance TEPCO's investigation at this late hour, but I wonder knew from before last?