jlduh said:
I confirm what you say, i analysed this stuff very accurately and the flash out of the building implies that some gas (already inflammed or not) have to escape the building BEFORE the walls are destructed.
The flash is then going "off" and then the explosion comes with destructions.
EDIT: here are the links to frame by frame explosions at N°1 and N°3 (i think this is what you were looking for Artax):
http://gyldengrisgaard.dk/fuku_expl1/
http://gyldengrisgaard.dk/fuku_expl3/index.html
At the risk of again being redundant again, yes. The VISIAL evidence is what led to all of my initial speculation about the vector of the blast and its origins from the region of the fuel transfer chute. The additional clues -- information about the drywell cap seal, and the fuel transfer chute seal followed.
Initial general speculation regarding the explosion at Unit 3 was that such an energetic blast could only arise from the RPV, yet the RPV pressure was initially preserved. How could that be?
A lot of visible thermal energy is released BEFORE the entire building explodes and the steam explosion occurs. It appears at a very specific location and in a very specific vector, through the southeast end of the building, from, or over the SFP3.
The ignition and conflagration of the initial ejected gas cloud appears to me to occur after it has, like Elvis, left the building. The explosion of the entire building appears to follow the external ignition, and the rising steam column is the last event.
And if you choose not to dismiss the audio evidence, there are also clearly two and possibly three distinct explosions, depending on how one interprets the data (M. Bachmier has done extensive analysis on this).
MaderDoc's analysis of the roof damage supports this scenario, IMO.
In retrospect, is there anything like the bright blue flash that might be expected with a sudden criticality on that video? To my eyes, no. The "sudden" event is the initial outward blast of a cloud of white gas then a fireball at the SE corner.
@MadderDoc:
Sir - might I respectfully ask if you might consider turning your talented eyes toward the south end of Building 3 and perhaps adding your assessment of the mechanical and thermal damage to the south end of the building as well as the roof? I believe you may find similar evidence that the initial blast and thermal damage had a substantial horizontal vector as well. Thanks.