information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise
21 Mai 2014
May 21, 2014
Fukushima water treatment lines off for some time
The operator of the Fukushima Daiichi nuclear power plant suggests it will take some time before all 3 lines of a wastewater treatment system can resume operations.
Tokyo Electric Power Company turned off Line C of the Advanced Liquid Processing System on Tuesday after discovering that the calcium levels of untreated water weren't falling.
Calcium hampers the removal of radioactive substances and needs to be eliminated before water is treated.
Another problem forced the utility to halt Line A last Saturday.
TEPCO believes that the filters on these 2 lines are malfunctioning.
Back in March, Line B was shut down after its performance dropped.
TEPCO assumes that the plastic parts of the filters have deteriorated due to radiation exposure.
It has replaced the parts with ones made from another material. Line B is likely to resume operation on Friday.
But the company says Line A will remain turned off until mid-June and it has no idea when it can restart Line C.
May 20, 2014 - Updated 21:16 UTC
May 20, 2014
Fukushima's last water treatment line shut down
http://www3.nhk.or.jp/nhkworld/english/news/20140520_24.html
The last functioning water treatment line at the trouble-ridden Fukushima Daiichi nuclear power plant has been shut down.
The plant operator, Tokyo Electric Power Company, says it turned off the last of the 3 working lines of the Advanced Liquid Processing System, or ALPS, on Tuesday morning.
It says the concentration of calcium in contaminated water did not drop before treatment. Calcium hampers the removal of radioactive substances and needs to be eliminated before water is treated.
TEPCO says there may have been problems with the filter that removes calcium and metals.
The utility shut down a second line on Saturday and the first in March after a defective filter caused its performance to drop considerably.
The filter has since been replaced and equipment was cleaned. The operator hopes to restart the line at the end of this month.
TEPCO had initially planned to have all 3 lines fully operational in April, but now there are no prospects for the system to restart stable operations.
May 20, 2014 - Updated 05:25 UTC
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