- #12,811
SteveElbows
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- 9
What is the theoretical mechanism by which the temporary stopping of nitrogen injection leads to an increase in measured drywell temperature? Or has the article made a poor assumption?
A similar causal relationship was mentioned in the document I translated at https://www.physicsforums.com/showpost.php?p=3843299&postcount=12798SteveElbows said:What is the theoretical mechanism by which the temporary stopping of nitrogen injection leads to an increase in measured drywell temperature? Or has the article made a poor assumption?
tsutsuji said:A similar causal relationship was mentioned in the document I translated at
The steam seems to be coming from around the well-cap rim, as was usual after the blast. One of the well-cap steam-ejection spots was right at the North edge of the pool.jim hardy said:indeed Arnie's pool criticality hypothesis would have steam-cleaned it and scattered the contents. Instead it's gor rebar pointing in.
Yet in the satellite photo 3 minutes post-explosion it looks to be steaming vigorously.
SpunkyMonkey said:Here's a video clip of what clearly appears to be part of the refueling crane, I suspect it's the upper deck of the trolley. It's also the same object I posted previously, suggesting it looks like the trolley deck.
SpunkyMonkey said:The steam seems to be coming from around the well-cap rim, as was usual after the blast. One well-cap steam-ejection spots was right at the north edge of the pool.
This is my best effort to superimpose the floor plan onto the 3-minute-after image.
The satellite images seem to skew square buildings somewhat, so the floor plan is slightly skewed I hope to the best fit. I believe the steam is not coming from the pool but from around the primary containment, as seen in a lot of imagery from the early days.
SteveElbows said:This didn't mean I ruled out the possibility that the refuelling thing was in the pool
This is my best effort to superimpose the floor plan onto the 3-minute-after image.
SteveElbows said:I'd still like to know what the theory behind this trend is.
jim hardy said:nicely done ! Helicopter video looks like a narrow plume too.
SteveElbows said:I know I went on a few times about the possibility that the fuel handling bridge could have been blown out of the building in a way that made it tip over the southern edge of the building to the ground below, but I was not especially wedded to this theory in particular. We have come quite a long way from the days where people were studying the first high res photos for signs of the resting place of the refuelling bridge, partially due to expectations that the bridge might have been blown vertically high into the air, since the dramatic explosion footage of reactor 3 captured got a lot of attention. I don't think there was anything wrong with people at least briefly considering the more dramatic pool possibilities such as prompt criticality, but there was never any hard evidence that should have strongly pointed people in that direction. Anyway like I said its been quite a long time since those early confusing days and the theories that followed evolved into something that's quite a bit less dramatic.
SpunkyMonkey said:Thanks Jim! :)
But a question the crane falling in the pool raises is: Could a hydrogen-only explosion in the upper-deck space dislodge a 35-ton machine and shove it into the pool?
SpunkyMonkey said:<..>a question the crane falling in the pool raises is: Could a hydrogen-only explosion in the upper-deck space dislodge a 35-ton machine and shove it into the pool?
But a question the crane falling in the pool raises is: Could a hydrogen-only explosion in the upper-deck space dislodge a 35-ton machine and shove it into the pool?
Most Curious said:Hydrogen launched the Saturn 5.
Looking at the crud on top of the fuel assemblies in #3 makes me wonder something. If convective cooling of the fuel stops due to blocking the water flow with debris would the fuel cladding be overheated enough to bulge, crack and fail?
MadderDoc said:The machine may well have been not overly displaced by the immediate effect of the explosion, but then came down the roof on top of it.
jim hardy said:i guess we don't know when it fell into pool. Could it have got tossed about by earthquake?
Most Curious said:Hydrogen launched the Saturn 5.
Most Curious said:Hydrogen launched the Saturn 5.
Enough hydrogen, well mixed with exactly the right amount of air could release a LOT of energy!
Joffan said:Both Unit 3 and Unit 4 spent fuel pool pictures suggest to me that Tepco should rapidly pursue an active pool water filtration system - does anyone know if that is in the plan?
Cire said:Just to be correct. RP-1 (refined kerosene) launched the Saturn V. Only the upper stages are (J2 engines) Hydrogen powered.
Most Curious said:In order to put the crane into the pool would only require blowing the walls outward far enough for the trolley to fall off the rails, which may well have been what happened.
jim hardy said:i guess we don't know when it fell into pool. Could it have got tossed about by earthquake?
If it's like my PWR crane it's not much of a shove. It straddles the pool and has steel wheels that run on steel rails just a few inches from edge..
<snip>
old jim
Thanks a lot.westfield said:<..> a report with images of a KK FHM but in Japanese - Page 30-32 of this PDF
Rive said:The FHM rails are embedded into the floor of the fifth level.
SpunkyMonkey said:Right, so blowing out the walls isn't a prerequisite for knocking down the FHM. But the scenario that it was knocked into the pool by falling roof girders seems pretty clear given the entanglement of the FHM ladder with a roof girder, which, because the ladder was previously supported only by the FHM, seems to dictate that the FHM must have been in its normal position when the girder became ladder entangled.
<snip>.
MadderDoc said:Thanks a lot.
<snip>
From what we have seen of the corresponding parts in unit 2 and 3, they do not seem to have any such improved designs.
Most Curious said:<..>
My point remains the same - hydrogen and appropriate amount of air can make a big bang! The claims made early on of a nuclear type explosion in the pools was, and remains, nonsense IMHO. <..>
westfield said:A note to all related to that - the FHM's across the 6 units at fukuichi are not even close to identical.
MadderDoc said:But on top of that, moments after the explosion we have this big cloud rising over the building, apparently approximately spherical, 75 m diameter -- which would be a volume of about 220000 m3. So where did this huge volume of air come from, how did it get there, what was its composition??
westfield said:That ladder IS strange to be just there but I don't think we can be so conclusive about how it remained there and how the FHM got where it is..
For instance it's not impossible that the ladder could have jammed itself in that position in the FHM floor track as the FHM went into the pool, only later to have the roof truss come down next to it, ladder has nowhere to go as its stuck in the track so it's handrail "clips" itself over the roof truss section.