AntonL said:
In the last days we discussed bullets (debris at high velocity) smashing through
neighbouring roofs let's call these falling debris, being material blasted high into the sky and
falling at high equally high velocity. Penetration holes can be seen on turbine building no
3 and in the latest SDF video from two days back, showed steam escaping through holes
of unit 2 roof - possibly also a bombs from rector 3 explosion.
What we have not discussed are these large chunks of debris falling into the SPF and destroying the
spent fuel rods and unit 3 also had 200 brand new rods. In this case the Zirconium
jackets could be destroyed and fission products exposed to the water in the pools
Anton:
It is possible but not very likely that high-lofted falling debris could have damaged SFP3 or other buildings and structures. My initial assessment was that the greatest force of the blast went upward, from the explosion video. But the subsequent photos of the damage on the ground told a different story, with the greatest visible damage appearing to have come from a sideways blast.
I eventually resolved this in my mind by the observation that it was the concrete slabs blasting outward from the building that became bullet or missile like projectiles that did the damage, east and west, and the falling crane, damage to the north. But why, then, if most of the damage appeared to be on the southeast end was there little or no visible damage to Bldg 4? I will come back to that
The vertical component went through much lighter roof panels and may have been less constrained going upward, plus channeled upward by the stronger structure of the weight bearing beams and concrete slab sidewall construction and perhaps the 3SFP, particularly if any large volume of water in the 3SFP was explosively vaporized.
When you consider the absence of north side projectile damage, I believe it is because neither the north or south sides of the upper floor had concrete slabs. The weight bearing function of the east and west walls was to support the weight of the two side rails and the large overhead crane. The reinforced wall structure and the large side rails of the crane helped to hold things together somewhat, with the side panels popping out. Absent concrete panels and weight-bearing columns north and south, there was little projectile blast damage southward other than lighter debris, and nothing to constrain the overhead crane from being blasted out the north wall, or simply rolling down the rails and out the side of the building if the north wall and a couple of the north columns collapsed. The north side damage was to the adjacent lower building, not the side of Bldg2.
On the recent discussion of the flooding of the basement of Turbine Bldg 3, there was a side elevation diagram that showed the relationship of the height of the top of Reactor Bldg 3 vs the top of Turbine Bbldg 3. That will give a bit more insight into the trajectory of the side wall panels that blew out, east and west.
So, in retrospect, I can see how a hydrogen explosion first exited Bldg 3 upward and southward.
As for vertical upward, then downward "bomb-like" (falling debris), there are not that many candidates for heavy debris that could have been blown straight upward. These, in my mind, were
1) section(s) of the roof panels (sheet metal) and girders (not that heavy)
2) the fuel handling machine (visible in RB4 but not in RB3 after the blast,
3) the reinforced concrete plug or sections of the plug atop the drywall containment of reactor 3
4) the contents of SFP3 itself
If the plug blew from the drywall containment, then I cannot see with certainty where it punched through the roof girders, or where it fell to earth, or why a jet of steam, apparently from the drywall containment of RV3 might be seen afterward. It would leave a huge gaping hole and voluminous billowing smoke for days (maybe). This scenario seems very unlikely to me
If the fuel rods were blown straight up and out of SFP3 by the explosion, how did a blast above the level of the SFP3 cause it? Perhaps residual water in the SFP vaporized explosively. Very speculative at best and also seems very unlikely.
That only leaves one "heavy" candidate, the fuel handling machine, and I doubt that did enough damage falling to displace any fuel rods.
Addendum: Per Anton's request, please note that any reference to "bombs" or "missiles" refer to falling or flying debris, and should not be interpreted otherwise. Apologies to any conspiracy theorists who may have misunderstood.