With dangerous radioactivity continuing to plague Fukushima Dai-ichi, Japan is preparing to make good on plans to build a wall of ice around the plant. The country will spend some $473 million on the project, which involves piping coolant through walls of frozen soil surrounding the plant. That should keep groundwater separate from radioactive water, of which there is plenty: An additional 400 metric tons of the stuff are created daily as part of the reactor cooling process. Meanwhile, the plant's water treatment equipment will undergo improvements, the BBC reports. (More Japan stories.)