Energy From Thorium Discussion Forum

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PostPosted: Oct 11, 2014 8:38 am 
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The statement of the Chairman of Indian DAE at IAEA has some interesting points

http://dae.nic.in/writereaddata/gc2014_0.pdf
On page 4 of the document, successful separation of actinides from fission products has been claimed. This could provide a more economical, non-proliferating means of providing fissile feed to thorium powered or fast reactors.

A quotation from page 7 is also of interest.
Quote:
The human population living in Kerala coast in South west India is continuously exposed to natural background radiation emanating from the monazite-bearing sand, with the dose varying up to a high of 45 mGy per year in the High Level Natural
Radiation Areas (HLNRA), compared to less than 1.5 mGy per year in some other places in the same area (that is similar to Normal Level Natural Radiation Areas, NLNRA). As a part of on-going research of screening newborns in these areas in India, the studies have now exceeded 160,000 newborns; these studies did not reveal any statistically significant difference in the frequency of any type of malformations and stillbirth after adjusting for the confounding factors such as maternal age at birth, consanguinity, ethnicity, etc., and frequency of Down syndrome. Adaptive response studies are in progress using end points such as chromosome aberration, micronuclei and gene expression pattern.

This study could form the basis of a more rational view on radiation.


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PostPosted: Oct 12, 2014 12:26 am 
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Joined: Jun 05, 2011 6:59 pm
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Location: NoOPWA
Good find. It is now in my facebook page.
HT.

_________________
DRJ : Engineer - NAVSEA : (Retired)


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PostPosted: Mar 01, 2016 6:45 am 
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Used fuel is one of the bugbears of nuclear energy. The radiation is really energy and we should convert radiation and the resultant heat to give a better image to used fuel till recycling is more widely accepted.
We could cool the used fuel in a coolant boiling not below 400C. This hot coolant could be used to produce steam and power. It could do so for a few years till it is cool enough for reprocessing.
Zirconium could be recycled.
Used fuel could be partitioned into fission products, uranium and transuranics.
Major part of used fuel is uranium. UCl6 is highly volatile and should be removed first to reduce mass and effort of processing the rest.
highly radioactive Cs and Sr chlorides could be removed by washing and fractional crystallisation. They could be used as RTG fuels.
Plutonium, which would be reactor grade only, could be removed as PuF6 by fluorination of remainder. It is useful fissile for thorium or fast reactors to burn uranium.
Remaining fission products could be dumped in a borehole.


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PostPosted: Feb 17, 2017 3:07 am 
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Thorium fuel and breeder development is necessary to limit the growth of huge quantities of used fuel, one of the pretexts of opposition to nuclear power. It is only possible by chemical processing of used fuel.
Is anyone except Russia and China doing anything serious about it?


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PostPosted: Feb 18, 2017 2:15 am 
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Quote:
For example, Ed Pheil, the Chief Technology Officer of Elysium Industries, announced for the first time in public that his company was developing a 1000 MWe molten chloride salt fast reactor that would not use any online chemical processing. The fuel salt will periodically be processed to remove fission products, but the actinides will remain in the salt “forever” and become part of the fuel mix for future reactors

I wonder if there can be breeding enough to continue fission and also to cater to neutron absorption by fission products? As a non-nuclear engineer I have always believed in the necessity of removing them.


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