Energy From Thorium Discussion Forum

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PostPosted: Jul 11, 2018 10:44 pm 
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Joined: Apr 25, 2011 10:01 pm
Posts: 39
I have an opponent who claims that spontaneous wigner energy releases cause graphite fires.

Is this applicable to a LFTR?

How can I best rebuke claims that this is a valid safety concern for LFTRs?

Thanks for all your help.


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PostPosted: Jul 12, 2018 3:59 am 
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Joined: Jun 19, 2013 11:49 am
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almost all graphite moderated power reactors keep the graphite sufficiently hot that the amount of Wigner energy that can build up will be extremely small.
This is especially true for an MSR because the graphite temperature will be well over 500C


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PostPosted: Jul 12, 2018 8:14 am 
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Joined: Apr 25, 2011 10:01 pm
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Thank you for pointing me in the right direction. I was able to dig up a lot of material that confirms this.


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PostPosted: Jul 12, 2018 10:25 am 
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Joined: Jun 19, 2013 11:49 am
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matthewwight wrote:
Thank you for pointing me in the right direction. I was able to dig up a lot of material that confirms this.


You're welcome.
The fun thing is that earlier Magnox stations (like the UKAEA reactors at Calder Hall and Chapelcross, and the first CEGB station at Bradwell) had provision to shutdown the reactors for a Wigner annealing, and the reactors at Bradwell were originally to be built with special modifications to the fuel channels to increase graphite temperature (sleeves to reduce gas exposure to the graphite), before improving heat transfer temperatures made it all redundant.


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