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PostPosted: Feb 24, 2011 8:48 pm 
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Joined: Mar 16, 2010 1:48 am
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Location: Guangdong, China
As the title showed, why don't we take LiF as moderator? from the nuclear data, we can find that Li-7 has very small absorption XS, big reduction ratio. even consider the cost of seperation Li-6, Li will not be more expensive than D2O, but why German use D2O as moderator rather than Li when they produce nuclear bomb in world war II?
attached is the XS of Li-7


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PostPosted: Feb 24, 2011 9:06 pm 
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We do use LiF as the moderator. The molten salt is LiF-BeF2 for most LFTRs (the French team does not include the BeF2).


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PostPosted: Feb 24, 2011 10:08 pm 
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also, Li never been taken as moderator in any text book and MCNP, I don't think it's chemical properties will affect people's discuss with it's moderator property. can any guys tell me this history reason?


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PostPosted: Feb 24, 2011 10:15 pm 
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Lars wrote:
We do use LiF as the moderator. The molten salt is LiF-BeF2 for most LFTRs (the French team does not include the BeF2).

yes! in molten salt reactor, LiF do contribute to the neutron moderation, that's why I ask this question, but I want to know why people don't take Li as moderator in history except msr? for example in the text book "the element of nuclear reactor theory" writed by S.Glasstone, in mcnp data, the thermal scatter library also do not contain Li.


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PostPosted: Feb 24, 2011 10:21 pm 
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Joined: Nov 30, 2006 3:30 pm
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Still too absorptive, even with isotopic separation. This might be a good thread to look at:

viewtopic.php?f=3&t=159


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