Recent content by tonio

Interesting report! Also available in English? I can't read it, but the figures more or less speak for themselves, I copied two of them. P43 cross section geology shows the geology of the site, as far as I can see. I assume that the dark green layer is a relatively impermeable layer. P53...

translation...

Some observations about the ground water fluctuations: - a.ua quotes Tepco concluding that "there could indeed be a link between the groundwater at the coastal side of the plant where the wells are, and sea water". It is difficult to believe that Tepco has made such a silly statement. Unless...

I just looked at the data. I didn’t realize that the remediation efforts are focused at a very small area inbetween the reactor 1 and 2 inlets, possibly related to a ground water contamination caused by a spill in 2011? Three images: - 01: general ground water quality data; - 02: detail of area...

This is indeed an interesting report. It shows that: - the original land surface was appr. 30 m above sea level; - the whole site was excavated to a level of appr 10 m above sea level; - the central part was even further excavated to appr. 5 m below sea level, to enable the construction of the...

Interesting information! In the first pdf, a photograph of the core of boring 1-5 is added. When looking at the phoptograph and the added text, I see: - +1,3 – +3,5 m OP: apparently sand-like material - -1,9 – +1,3 m OP: apparently clay-like material which according to te author is “soil...

OK that’s new information for me. That poses an interesting question: is the water table in the buildings kept relatively high in order to avoid excessive inflow of ground water into them? Do you know if that is the case? If that is the case, a geohydrological isolation using the...

In fact the site is not that big, the length of the area to be isolated is about 700 m, there are landfills that are comparable in size of even bigger. Regarding the interception trench, it is not so problematic when the subsuface is very permeable. The main issue is to intercept the...

To be clear: the previous is a regularly used method to contain contamination spreading from contamination sources (landfills, contaminated factories, etc.).

Sketch of likely present situation

What surprises me is that the contaminated area has not been geohydrlogically isolated. That could have been reached by: - digging an interception trench along the foot of the steep slope at the land site of the contaminated area - constructing an impermeable barrier along the seafront of the...

A question for the experienced nuclear engineers. As far as I understood, during the meltdown most or all the fuel elements in the RPV's lost their zirconium cladding. Thus a mixture of UO2 and reaction products, both in the RPV’s and at the bottom of the secondary containment, was exposed to...

Just thinking out loud a little bit, not knowing too much about these reactors... I understood that contaminated water from the reactors leaked towards the surroundings via underground conduits for cables and maybe also water drainage pipes. I suppose that this is normally not possible but...

forgot the photo.

I understand what you mean. See the added details of photos. In the left photo, a steam plume seems to come from the top of the stack. In the other photo (from the quoted message), a steam-like plume emerges from a lower level and changes from whitish to faint black (soot?).