Sunday, April 29, 2012

Radioactive Cesium in Seawater Inside Silt Screen Turns Up Slightly at #Fukushima I Nuke Plant

I thought I hadn't seen TEPCO's press releases on radioactive materials measurements at water intake canals and subdrains at Fukushima I Nuclear Power Plant for some time. It turns out the data has been moved to a separate page "Result of Radioactive Nuclide Analysis around Fukushima Daiichi Nuclear Power Station".

Here are couple of charts from the latest (4/28/2012) data. The cesium densities in the seawater inside the silt screen for Reactor 2 and Reactor 3 have been turning up slightly. For the seawater inside the Reactor 2 silt screen, it could be within the normal fluctuation. The rise in the cesium density in the seawater inside the Reactor 3 silt screen looks rather persistent and sharp, but that could also be within the normal fluctuation in the longer time frame. Note the unit is becquerel/liter.

Seawater inside Reactor 2 silt screen:

Seawater inside Reactor 3 silt screen:

Checking the sub-drain pits, only the Reactor 1 sub-drain and Reactor 2 sub-drain show significant numbers. Here, the unit is becquerel/cubic centimeter.

Reactor 1 sub-drain:

Reactor 2 sub-drain:


Anonymous said...

It is puzzling why there are high levels at all in the intake screen areas at all. There shouldn't be at this point now that they have coated the quay floor with a substance that they claimed would block radiation from being emitted. Was this project not completed maybe.

If it was completed then all radionuclides found at this point would constitutes leakage from reactors and or SFPs

Anonymous said...

There have been minor spikes like this in the past as well. I don't know what they mean and I doubt we'll ever find out, but I have this theory that we are seeing minor fuel relocations and shifts in the water flow patterns, exposing fresh Cs-laden surfaces to water.

Anonymous said...

Talking of Cs, Takashi Morizumi's photos are interesting.

Anonymous said...

Oh that's a good one if it's not faked. I saw similar during the Chernobyl emergency. People were using scraps of film as makeshift dosimeters.

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