Fukushima Daiichi's: Extremely high levels of radioactive substances" leaked NHK(02/19/2014)
Channel: Deep13th Nuclear Waste Info
Date: 2014-02-20

Feb. 19, 2014: Highly radioactive water leaks at Fukushima plant [...] [Tepco] says water containing extremely high levels of radioactive substances has leaked from a storage tank. [and] was found on Wednesday night [...] the water leaked from a seam near the top of the tank. It traveled along a rainwater pipe and flowed outside the barrier that surrounds the tank. [...] Officials say their investigation is still underway.

Bloomberg, Feb. 19, 2014: Tepco Says New Leak of Radioactive Water Found at Fukushima Site [...] About 100 metric tons (26,400 gallons) of water [...] Beta radiation readings of 230 million becquerels per liter were taken in a water sample collected today near the H6 tank area [...] About 300 tons of contaminated groundwater seep into the ocean each day [...]

    "The sample was collected today near the H6 tank area"... Why not sample the water from inside the tank it leaked out of?
    100 metric tons with 230,000,000 Bq/L = 23 Trillion Bq of Strontium-90 & other beta emitters, with half generally being Strontium-90 — about 11.5 trillion Bq of Sr-90
    Tepco claims 10 trillion Bq of Sr-90 entered the sea from May 2011 to Aug. 2013

Kyodo News, Feb. 20, 2014: Roughly 100 tons of highly radioactive water leaked [Tepco] said Thursday [with] 230 million becquerels per liter of strontium and other beta ray-emitting radioactive substances. The utility believes the liquid has not flowed into the adjacent sea as there is no drainage nearby [...]

Tepco "believes the liquid has not flowed into the adjacent sea"... yet.  A recent special on Japan TV about Fukushima's contaminated water summed up the situation this way:

NHK (at 36:30 in): "What has become clear is that it's very hard to control radioactive materials once they  get into the environment."