Wall will block groundwater from nearby hillsides that has been flowing under the plant and mixing with polluted water already there.
Fishermen caught a three-eyed fish in a reservoir that receives water from a nuclear plant in Argentina.
A second nuclear plant in Japan sits atop a possibly active seismic fault.
President Obama has nominated geologist Allison M. Macfarlane of George Mason University to lead the Nuclear Regulatory Commission.
Lethal radiation levels of more than 10,000 millisieverts per hour raise the need for caution to even greater extremes that workers at the Fukushima-Daiichi nuclear plant must take.
Here at Discovery News, we understand the crisis in Japan is confusing. There was an earthquake, a tsunami and now a nuclear disaster. Our experts are on hand to answer any questions you may have.
Critics say the Nuclear Regulation Authority (NRA) is a new watchdog without any teeth.
Between 24 and 2,500 new cancer cases in the future might be linked to the nuclear disaster, but the most probable estimates is 180 cancer cases, with 130 deaths from those cancers.
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