[ RadSafe ] Fwd: [New post] Fukushima nuclear decommissioners have no ide...

Brennan, Mike (DOH) Mike.Brennan at DOH.WA.GOV
Mon Apr 6 11:50:30 CDT 2015

It would be hard to do the heat transfer math without some idea of the geometry (I don't think, "Assume the elephant is a sphere" will work well in this case).  That being said, I am highly skeptical that the fuel is still molten, or has been for a couple of years.  That doesn't mean it will be easy to deal with.  There will be a full robot graveyard before this problem is dealt with.

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From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of JOHN.RICH at sargentlundy.com
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Subject: Re: [ RadSafe ] Fwd: [New post] Fukushima nuclear decommissioners have no ide...

ANS 5-1-2005 "Decay Heat Power" seems to indicate that at this late date the total thermal power is about 1% of the initial operating power. I'm guessing its not molten anymore, but a heat transfer calc would have to be done to confirm that the heat conduction from the core surroundings is sufficient to keep the corium below its melting point. Wikipedia indicates corium melts around 1200 deg C.  Somebody has to have gone through this exercise, and maybe we can get a response from a heat transfer specialist. 
 But its probable that the core is hot, but solid.

Pls fell free to correct this or add to it.  It's just a first approximation with a lot of unknowns - -jmr

John Rich
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