Recent content by MadderDoc

Hard to say something generally about the CRDM housing. Some of the CRDM housings seen periferically in the video appear to be sort of intact, hanging onto the RPV bottom, vertically in their original position. Other places we see CRDM housings obviously displaced and damaged. However at the...

The micro drone does not appear to have any camera that could offer a straight up view. However the video from close to the position of the RPV bottom does in some places show horizontal views, in which damaged and crashed CR guide tubes are visible. That would not seem possible, unless there...

Well, observations just does not seem consistent with a theory, that implies dripping only somewhere in the "middle". The widely accepted theory likely also did not predict that it would be possible to find identifiable CR guide tubes ejected from the RPV, in the space underneath it. So the...

They were at the time injecting water into the RPV through the CS or FDW lines at a rate of 70 m3/day. That is just about 0.8 liter/s [~0.2 gallons/s]. That could be it :-)

The droplets are falling from the wet surface of the robot once it is retracted from the water.

I would think it unlikely, that the robot managed to come by detecting and locating every center of disturbance there may in fact be of the water surface. However, it would be expected that the water coming out from the broken RPV bottom would come out rather through a number of prefererential...

That is the video "170724_02j.mp4". http://www.tepco.co.jp/tepconews/library/archive-j.html?video_uuid=ji55t6eq&catid=61699 Yes, that is true, however the water surface we see in that video segment, from about 02:06, is outside the piedestal area, meaning it is not being disturbed by water...

The fact that the water surface is disturbed is revealed when light from the robot happens to hit the disturbed surface from below, to be reflected in it, in angles such as to be registered back at the camera of the robot. Of course the water surface is not disturbed only in those locations...

Yes the concrete shield plugs in unit 1 are in severe disarray. Here is a link that may be used as an entry to the subject, and to the original handouts about the observations: http://www.fukuleaks.org/web/?p=16279

It is one of 'bonus'- samples that came out of the tests they did way back in July 2013, probing the soundness of the TIP lines of Unit 2. They didn't manage to get any of the probes past the TIP indexers. (That is about 8-10 meters in from the PCV wall). When the probes were withdrawn, some...

The water level measuring system at the plant was not very advanced, and could not cope well with elevated temperature, and evaporation from the reference leg under these accident conditions. There was no way of correction for loss of water from the reference leg, meaning the readout values for...

Besides those two dominant blow out routes, there are several other lesser release points from the area of the top shield plugs, along their outer perifery, up between the broken slabs and along cracks in them. Pressure will out.

It is ~the max design pressure for the drywell. It is absolutely not built to operate at that pressure. I think it is rebar from a concrete layer in the original upper roof construction. Quite a lot of a section of that appears to have crashed and remained as debris on the top of unit 3...

Yes, you mentioned that earlier. What is the significance of this observation, as you see it, I mean what does it tell?

Well, during that period, while the water level indicators went wildly up and downscale. the PCV pressure about doubled, until at the time of the explosion, it abruptly fell back. From basic physics, the pressure p inside the system during that period would have been directly proportional with...