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Cesium-137 density spiked over 300 × in groundwater of Reactor 2 seaside
Various nuclides density rapidly increased in groundwater collected in Reactor 2 seaside, according to Tepco.
As Tepco reports, they found Mn-54 and all β nuclides density (to include Sr-90) jumped up on 11/10/2014. The observed density was the highest readings, which were approx. 10 times much as the previous readings. (Mn-54 : 5,000 Bq/m3 (11/3) → 54,000 Bq/m3 (11/10), All β : 230,000,000 Bq/m3 (11/3) → 2,100,000,000 Bq/m3 (11/10))
From the follow-up analysis in order to verify the accuracy, they found Cs-134 density jumped up from under detectable level (4,200 Bq/m3) of the previous reading on 11/10 to 920,000 Bq/m3, also Cs-137 density increased from 9,000 Bq/m3 on 11/10 to 3,000,000 Bq/m3, which are the highest readings ever.
They didn’t announce the readings of Sr-90.
In this area, groundwater is stopped flowing to the port so groundwater tends to be accumulated. This is why Tepco keeps pumping us water from ground and the sample was the pumped up water.
About the potential cause of this sharp increase in radioactive density, Tepco comments it might be because they reduced the water volume to pump to be 10% since 11/6/2014, however it wasn’t explained how specifically the reduction can cause the rapid increase.
Additionally, groundwater level has been continuously increasing in this area for some reason. (cf, Groundwater coming up in seaside of Reactor 2 again / Overflowing up-ground around 18th December [URL])
http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_141113_04-j.pdf
http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_141114_06-j.pdf
http://www.tepco.co.jp/nu/fukushima-np/f1/smp/2014/images/2tb-east_14111302-j.pdf
Iori MochizukiThe post Cesium-137 density spiked over 300 × in groundwater of Reactor 2 seaside appeared first on Fukushima Diary.
Source: http://fukushima-diary.com/2014/11/cesium-137-density-spiked-300-x-groundwater-reactor-2-seaside/
