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(Japan Times)   Leaks in Fukushima No. 1 radioactive water tank attributed to blown seals. Yet another fetish that ends badly for all concerned   ( japantimes.co.jp) divider line
    More: Obvious, Tokyo Electric Power Co.  
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1949 clicks; posted to Main » on 25 Aug 2013 at 3:44 PM (4 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»

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2013-08-25 03:54:38 PM  
2 votes:

Makh: Fix the damn thing...

and leave my private life out of it. Ok, pal?

/Now I'll have that damn song in my head all day. Thanks, Fark!
2013-08-25 03:25:52 PM  
2 votes:
Fix the damn thing...
2013-08-25 02:09:51 PM  
2 votes:
No, no it's just ice cream
2013-08-25 08:31:51 PM  
1 vote:
A criticality event in a reactor chamber would be a disaster since the heat and increased radioactive flux will warp the fuel rods still in there, meaning you won't be able to remove them.

You are aware that a lot of the fuel at Three Mile Island was effectively jackhammer out of the reactor, right?  The 'fuel rods' at Fukushima most certainly don't exist anymore, since the cores were exposed to air for so long.  They no doubt melted and the fuel is now a lump at the bottom of the reactor vessel.  Early research suggested a melt through at unit 1, but they're now of the opinion that didn't happen (it wasn't seen when they dropped a camera into the containment and the radiation measurements in there don't support it).

Think a round peg in a round hole that suddenly turns into a square peg.

Watch the video on the cleanup of TMI some day.  Fukushima will no doubt be the same but tougher.

I wonder if lead shot poured into the reactor coolant lines would settle out in the bottom of the vessel and shut them down permanently?

There's no chain reaction going on.  The problem is that the reactor has so many holes at the bottom (control rods, sensors, etc).  What's really the problem is that the penetrations to the containment failed, which IIRC indicates temperatures over 500 degrees F (I have an article on the BWR containment failure modes somewhere on my computer).  What TEPCO *should* be doing with it's cute little robots is canvasing the reactor building for the sources of these leaks and trying to find a way to plug them.

IMHO, it's time an international effort take over from TEPCO.  They're clearly way in over their head, and in the typical Japanese fashion, they refuse to admit it.
2013-08-25 08:23:10 PM  
1 vote:
Riche:  enough to create a fission explosion.

"Just get hot" as in burst into flame releasing a cloud of Hydrogen gas which eventually explodes scattering deadly radioactive material everywhere in the area.  Tiny compared to even a small nuke, but VERY dirty.

No.  First off, there's virtually nothing in the reactor vessels that's left to generate hydrogen (there's a small amount made by radiolysis, but it's trivial).  Second, the fuel's been noncritical for well over 2 years.  The decay heat has gone pretty low.  It's not hot enough to 'burst into flame'.  Furel of this age is taken and examined in hot cells all the time.  It doesn't just 'burst into flame'.  Once the fuel's been subcritical for a few months, the danger point is basically past.  There's a LOT of research into this, try reading it some day.  If this was regular rector fuel, it'd be reaching the point where dry storage would be possible.

Finally - it's unlikely that there COULD be a critical reaction at this point.  The geometry required to actually achieve one is touchy, and the fuel itself is a lump at the bottom of the reactor vessel.  The water on top of it makes for a horrid moderator, and there's all the internals (stainless) mixed in with the fuel.  This is evidenced by that fact that there's no xenon or iodine production going on.  The absence of both means there's no chain reaction going on.

I find it hard to believe any sane engineer would ever allow a reactor design like the one at Fukushima to ever be seriously considered, let alone built.  Especially considering there are far safer options for nuclear power.

*shrug*  It was what was they thought up in the 50's.  The BWR has a lot of outstanding features.  Pretty much the only real drawback it has is the decay heat requires active cooling for a long time period (months) after shutdown.  Remember that these plants were tiny in the 50's when they first were designed.  They handled differently.  Then they grew tenfold (actually, more) in size.

Yet we got dozens them all over the place.  A lot of them built in earthquake zones, and all of them coming up on (or past) their design life.

There's no hard and fast design life on a large plant like a nuke.  A well maintained one can last decades, the flip side is a poorly maintained one can get wasted pretty fast.  Look at Zion and Rancho Secco - both were retired way before their licenses expired, mostly because the utilities running them had no clue what they were doing and ran the plants into the ground (Zion needed steam grnerators at an abnormally young age. Rancho Seco?  Who the fark lets a municipal water department run a nuclear plant?).  The flip side is Oyster Creek and nine Mile point are still running quite well, and Ginnea is almost as old and nobody even talks about that place.
2013-08-25 05:57:16 PM  
1 vote:

Triumph: The alt-news sites are in full-on bed-wetting mode.

True statement at any time for any situation, unfortunately. Hard to calibrate my meters when those outlets are always at Code Red for everything.
2013-08-25 04:31:18 PM  
1 vote:
Aww- I miss Gorgor at times like these.
2013-08-25 03:48:43 PM  
1 vote:
What do the Challenger engineers, Fukushima, and a male walrus all have in common?

They're all looking for a tight seal.
2013-08-25 12:46:36 PM  
1 vote:
oi44.tinypic.comView Full Size

"Well, I thought it worth it."
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