Posts Tagged sarcophagus

Fukushima Daiichi Nuclear Accident – 26 March status « BraveNewClimate#comments

More replies to my question, why don’t they just immediately dump concrete on these suckers and be done with it (aka “the sarcophagus solution”)?

 on 26 March 2011 at 4:35 PM Concreting the whole thing would be a very bad idea:

1) It would prevent any sort of cooling. The casing would most likely crack and leak

2) It would prevent all investigations, lesson-learning and dismantling

3) The resulting “monument” would be a major emotional landmark for the anti-nuke community

and

on 26 March 2011 at 3:04 PM. Even if entombed in concrete, I believe re-criticality would be extremely unlikely, and perhaps almost impossible. Criticality requires a certain geometry – and the water acts as a moderator to help reflect neutrons back into the fuel to promote criticality. As you lose geometry and water, you lose the likelyhood of criticality also. Besides, it would be difficult to entomb themm, and far better to bring these reactors under control if possible so we can learn from what happened.

Also – Chernobyl can’t even be compared to these reactors – it was a vastly different design. It had a massive explosion in the core itself, and for all intents and purposes no containment building or vessel. Part of the core was vaporized in the explosion, and rather than water as a moderator, it primarily used graphite, which was set on fire by the explosion – all of this spread contamination (and actual chunks and bits of fuel!) around the site, and served to pump a large amount of radiation up high into the atmosphere

via Fukushima Daiichi Nuclear Accident – 26 March status « BraveNewClimate#comments.

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Fukushima Daiichi Nuclear Accident Update (25 March, 15:45 UTC) (Facebook)

There is an interesting and apparently well-informed discussion going on on the IAEA facebook page.

Specifically, there is some discussion about entombment (I blogged about this earlier, but the discussion doesn’t end there, it continues):

  1. Unfortunately, you can’t entomb live/melting reactors—-they would have to explode/burn off a large amount of material before they could bury the rest without a criticality. For example, clean up crews at Chernobyl stated at least 70% of it’s reactor had vaporized before entombment(contrary to official reports).
  2. Chris Ilderton ‎”The Science Guy’ on CNN is still spouting about cementing/entombing the reactors(while they are in the process of melting) Anyone got data on maximum tempature a fully molten core CAN reach?? I’m not thinking concrete is going to hold up.
    11 hours ago ·  
  3. Chris Ilderton I’ve heard 4 to 6,000 Farenheit for a fully molten core
  4. Chris Ilderton Apparently, If the Uranium melts, 2800c, the carbon and stainless steel or any amounts of concrete isn’t going to stop it from heading toward a large enough underground water source to cool it. Not good. Besides the Cladding breaking down/melting, what are the next signs to look for, especially if we don’t have access to temp reading?
  5. ‎@Chris (and everyone else), if a meltdown occurs, it will stop at some point, and that should be well before it escapes the bottom of the containment, here’s why. As it heats up and melts the Zircaloy cladding, it’ll pool up in the bottom …of the RPV. It will also melt some of the control rods, which adds hafnium and boron, both asborb neutrons and slow the reaction. If it’s still hot enough to melt through the bottom of the RPV, it will fall into the dry well. Each time it melts something, all that additional material gets mixed in with the fuel making it harder to sustain a reaction. At some point, it has absorbed enough steel, boron, zirconium, hafnium, and other materials that the reaction stops and it begins to cool (very slowly).
    http://en.wikipedia.org/wiki/Nuclear_meltdownSee more

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Fukushima Daiichi Nuclear Accident Update (25 March, 15:45 UTC) (3)

From the comments on a website comes the first discussion I’ve read about why the authorities are not entombing the stricken reactors with concrete, as suggested by Horise Takashi. Perhaps he is ignorant of this? I’ve no idea if the comment is correct or not.

Is it still too early to entomb the plant in cement, like Chernobyl?

12 hours ago · 1 personSoCal Martial Law-Alerts likes this.Chris Ilderton ‎@Diana. Unfortunately, you can’t entomb live/melting reactors—-they would have to explode/burn off a large amount of material before they could bury the rest without a criticality. For example, clean up crews at Chernobyl stated at least 70% of it’s reactor had vaporized before entombment(contrary to official reports).

via Fukushima Daiichi Nuclear Accident Update (25 March, 15:45 UTC) (3).

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Fukushima nuclear crisis – worse than you think

The situation may be worse than the Japanese media are telling us. A lot worse.

CounterPunch have posted a translation of part of an interview with a long-time anti-nuclear activist and writer, Hirose Takashi:
Hirose Takashi: What They’re Covering Up at Fukushima:

Hirose Takashi has written a whole shelf full of books, mostly on the nuclear power industry and the military-industrial complex. Probably his best known book is Nuclear Power Plants for Tokyo in which he took the logic of the nuke promoters to its logical conclusion: if you are so sure that they’re safe, why not build them in the center of the city, instead of hundreds of miles away where you lose half the electricity in the wires?

He did the TV interview that is partly translated below somewhat against his present impulses. I talked to him on the telephone today (March 22 , 2011) and he told me that while it made sense to oppose nuclear power back then, now that the disaster has begun he would just as soon remain silent, but the lies they are telling on the radio and TV are so gross that he cannot remain silent.

I have translated only about the first third of the interview (you can see the whole thing in Japanese on you-tube), the part that pertains particularly to what is happening at the Fukushima plants.

Hirose: But what’s worrisome is that a nuclear reactor is not like what the schematic pictures show (shows a graphic picture of a reactor, like those used on TV). This is just a cartoon. Here’s what it looks like underneath a reactor container (shows a photograph). This is the butt end of the reactor. Take a look. It’s a forest of switch levers and wires and pipes. On television these pseudo-scholars come on and give us simple explanations, but they know nothing, those college professors. Only the engineers know. This is where water has been poured in. This maze of pipes is enough to make you dizzy. Its structure is too wildly complex for us to understand. For a week now they have been pouring water through there. And it’s salt water, right? You pour salt water on a hot kiln and what do you think happens? You get salt. The salt will get Read the rest of this entry »

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