[ RadSafe ] Fukushima Daiichi reactor decay heat

[Jaro Franta]

Hi Doug,

Try this :
http://www.facebook.com/photo.php?pid=584572&l=051c7b4acf&id=100000385781211


....as the comments indicate, the decay heat scales with the reactor thermal
power -- which is about 3.03 times the electrical power (for Unit 1, this
would be about 1394MWth)

Fukushima Dai-ichi Nuclear Power Station
Unit 1 (460MWe)
Unit 2 (784MWe)
Unit 3 (784MWe)
Unit 4 (784MWe)
Unit 5 (784MWe)
Unit 6 (1,100MWe)

 Jaro
^^^^^^^^^^^^^^^^^^^^^^^^^




-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Doug Huffman
Sent: March-12-11 9:38 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Fukushima Daiichi reactor explosion

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The Fukushima plants are fully shutdown, rods normally inserted.

They are overheating on decay heat from delayed spontaneous fission (not
neutron induced).  IIRC decay heat represents ~7% reactor power at
shutdown and decays at a rate determined by the power history.

Doug Huffman
Shift Test Engineer
retired since 1995
with fading memories

On 3/12/2011 08:23, Michael LaFontaine, P. Phys. wrote:
> The following report appeared on http://www.stratfor.com/, they also
> have footage of the explosion.
> 
>
> A meltdown occurs when the control rods fail to contain the neutron
> emission and the heat levels inside the reactor thus rise to a point
> that the fuel itself melts,
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