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To remove radioactive cesium from the water, TEPCO introduced the Simplified Active Water Retrieve and Recovery System (SARRY) in August 2011. Fourteen four-meter-tall cylinders stand inside a SARRY building. Filters inside the cylinders remove radioactive cesium, making the radiation dose 10,000 times lower.
On the west side of the plant's grounds, another system dubbed ALPS (Advanced Liquid Processing System) was being constructed. As this can remove 62 of 63 kinds of radioactive materials released from the plant, TEPCO decided to build ALPS to deal with materials that SARRY cannot handle, such as strontium. The one material ALPS cannot remove is tritium.
Source: Yuki Inamura and Masayuki Takata (Yomiuri Shimbun staff writers), "Dirty water an urgent issue at ruined N-plant", The Daily Yomiuri (Tokyo), March 9, 2013, P. 3
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