information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise
18 Mai 2014
May 17, 2014
Water treatment system halted at Fukushima plant
http://www3.nhk.or.jp/nhkworld/english/news/20140517_17.html
The operator of the Fukushima Daiichi nuclear power plant has again shut down a key water treatment system at the plant.
Tokyo Electric Power Company says it shut down one of the 3 lines of the Advanced Liquid Processing System, or ALPS, on Saturday morning. It says it took the decision because the system failed to reduce the calcium level in the water before treatment.
The presence of calcium hampers the removal of radioactive substances and has to be eliminated using sodium carbonate or a filter before water treatment. TEPCO is trying to find out why the calcium level did not drop and whether there's any problem with the treatment process.
The line of the ALPS system was shut down in March due to problems with the filter to remove metals including calcium. It was closed again in April when workers forgot to open a valve used to insert sodium carbonate.
One of the other 2 lines of the ALPS system has been shut down since March due to the partial loss of a filter that seriously damaged the performance.
TEPCO initially planned to begin a full operation of all 3 ALPS lines last month.
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