Multiple facilities including a Multi-nuclide Removal Facility (Advanced Liquid Processing System = ALPS) are used to treat the contaminated water accumulated in Fukushima Daiichi Nuclear Power Station. After the concentration of cesium and strontium contained in the contaminated water is reduced, the Multi-nuclide Removal Facility (ALPS) eventually removes most of the radioactive materials except tritium. On May 27, 2015, the treatment of all highly contaminated water (RO-concentrated salt water) which contained strontium, except residual water in the bottom of the storage tanks, was completed. This has helped reduce the risks attributed to contaminated water, such as an increase in radiation dose on the premises or contaminated water leaking from the storage tanks. The strontium-treated water, from which cesium and strontium have been already reduced will require further treatment by ALPS for further risk reduction.

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Changes in Types of Water Stored in Each Tank Area

The diagrams below show changes in types of water stored in each tank area from 2013 until the present. As shown below, the tank areas store either reverse osmosis (RO) concentrated salt water, water treated by the Multi-nuclide Removal Facility (ALPS), or strontium-treated water.

Structure of Main Treatment Facility: Multi-nuclide Removal Facility (ALPS)

A Multi-nuclide Removal Facility (ALPS) was introduced to improve the treatment capacity of contaminated water. It was difficult for the existing treatment facilities to remove radioactive materials besides cesium, but the Multi-nuclide Removal Facility can remove most of the radioactive materials except tritium. We are currently carrying out testing in order to check the treatment performance.

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