Japan Earthquake: nuclear plants

clancy688

Here it is: http://www.tepco.co.jp/cc/press/betu...es/110603a.pdf (page 8)

Out of the 720k TBq, 140 TBq account for C137. A little comparison: The Chernobyl core had a total C137 inventory of 280 TBq (of which only 40% escaped).

Bioengineer01

I rushed to answer the request and didn't have the time to finish reading the thread, my mistake, I had taken that into account in my original napkin calculations, but i didn't have the napkin :), so I tried to redo them in a rush and forgot about your point that is critically important. I am not an expert on the subject but had read about errors made in the original leaks reports and how they had to be corrected to I-131 as the baseline isotope, to account for the larger time impact of the longer lived isotopes. I also understand that my calculation fails to consider the decay of I-131 when released or accurate measurements from each basement and an individual estimate for the leaks through cracks in the foundations of each, plus all other isotopes not CS and I.

With respect to the official Soviet reports and the many many many... later reports quoting different numbers I found them searching in google, you will find similar stories of cover up to the ones now being reported about TEPCO, the parallels are just too close for comfort. Rather than me going back and finding one of those links, I highly recommend that you do the search, it will be very illustrative to your understanding of where we are in the disclosure cycle of the current crisis.

Bioengineer01

Great news!

Poor because the ration of the area of the mouth of the pool to its depth is far from ideal for creating a vectored explosion. You ideally need a gun barrel type structure, like the RPV or the PCV

Bandit127

Possibly a gun barrel length to width ratio might be ideal - I am not an expert.

But things designed to 'shape' (i.e. vector) explosions commonly have a L/W ratio of 1:1 or 2:1

Joe Neubarth

Thank you. MY observation was that the top of the fuel modules were visible at the depth in the water where they should have been located, regardless of the debris. If there had been an explosion as Artie Gunderson claimed, those modules should have been blown out of the pool like a shotgun blast. Since they were still visable, I believe Artie's conjecture is wrong.

Pu239

I had a question from another forum:

What actually happens if the #4 spent fuel pool collapses?

1. If they collapse in a heap - danger of repeated criticalities?
2. Radiation will become too high for workers to be on site.
3. Very serious situation leading to higher levels of radiation

Also, live video shows #4 continually steaming (I assume it's not smoke) - more noticeable at night. What causes this steam?

It must be SFP-related since there is no active core.

elektrownik

I must back to old thermal images case again, we have big problem here - in thermal images there was heat source in core location, sometimes its temperature was 1/3 bigger than SFP location. I asked about this here and some peoples told me that it could be damaged SFP gate and that water flow from SFP to RPV, but we all saw on SFP 4 video that gate is undamaged, so now, how it is possible that there is heat source in unit 4 core location ???

causeceleb

and furthermore, whenever Building #4 is steaming the steam comes from 2 distinct locations:
1) the front middle of the building (location of the reactor)
2) the south wall middle area, which is the location of the SFP

so, once again, why is there steam coming out of the area of the reactor in Bdg. #4

radio_guy

one thing nagging me about all that is wondering if the core of #4 was fully unloaded.. or if they were a little behind and just said oh yeah.. we did it. expecting to have it completed shortly?

elektrownik

Tepco webcam what the......
http://www.tepco.co.jp/nu/f1-np/camera/

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causeceleb

well, of course, the implication in what i am saying is that, contrary to what TEPCO says,
there was in fact fuel in #4 reactor and it's for certain that the primary containment
lid (yellow cap) was off and stored....

elektrownik

Tepco doesnt tell us also about unit 5 pressure stress test during earthquake until last gov report... so who know... maybe there was fuel in unit 4.

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causeceleb

yes, here at 2:48 a.m. Japan time Bdg. #4 is steaming like mad, and the "extra cloud of fog"
is being caused by all of that excessive steam.

elektrownik

I never saw so much steam from unit 4

causeceleb

this is about the 3rd time i've seen it. i think it happens whenever they water
the corium in the reactor at the same time they water the SFP.

elektrownik

I see 2 sources of steam in unit 4:

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clancy688

There's also a plume coming out of Unit 2. It's hard to see, though.