[CapTVK]

> ...are "technically incapable of blocking off groundwater with the frozen wall"...every day 300 tons of contaminated water leak from the crippled nuclear plant...

That article is out of date. The frozen wall has been working for quite a while but TEPCO wasn't (isn't) allowed to completely close it.

June 29, 2017

    Tepco applies to the NRA for permission to finish the Fukushima Daiichi ice wall. Closure of the wall has been throttled down by Tokyo’s Nuclear Regulation Authority due to fears concerning groundwater outside the turbine buildings falling below the level of water inside. Tepco has been forced to freeze the last half-dozen seven-meter-wide sections individually, wait to see what it does to external groundwater levels, and then proceed to the next section if groundwater level is maintained according to plan. One section on the inland side of the 1.5 kilometer ice structure is all that needs to be activated to complete the wall. To date, the sequential closure of Tokyo-mandated gaps has dropped the groundwater influx from 400 tons per day down to about 100 tons per day. No projections are being made as to how much more the in-flow will abate after the last part of the wall is frozen.

https://www3.nhk.or.jp/nhkworld/en/news/20170627_01/

I would also like to give a pointer to the "Fukushima Accident Updates" blog-page at hiroshimasyndrome.com. It collects and summarizes a lot of Japanse news and updates concerning Fukishima and related on a regular basis that will never reach the mainstream/ international press.

http://www.hiroshimasyndrome.com/fukushima-accident-updates....