The Guardian and other reports say the method is untested.
How can it be kept frozen over time? Moreover the core will continue to be "hot."

Completion of the frozen "wall" is expected by March, 2015, according to the Japan Times.
Money is also allocated to develop more powerful filtering equipment.

300 tons of groundwater are contaminated every day, according to the article by a staff writer of the newspaper.

A senior official, Shinkawa, said "We are deeply sorry for causing an international stir over this contaminated water problem." [!!!!!]