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- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Newsgroups: sci.space
- Subject: Re: Breeder reactors
- Message-ID: <BznFpx.93v.1@cs.cmu.edu>
- Date: 22 Dec 92 07:05:16 GMT
- Article-I.D.: cs.BznFpx.93v.1
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Lines: 39
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-
- -From: dietz@cs.rochester.edu (Paul Dietz)
- -Subject: Re: Breeder reactors (was Re: Justification for the Space Program
- -Date: 20 Dec 92 18:53:59 GMT
- -Organization: University of Rochester
-
- -In article <1992Dec20.044836.26997@seq.uncwil.edu> session@seq.uncwil.edu (Zack C. Sessions) writes:
- ->>Speaking of breeder reactors, why doesn't the U.S. have more of
- ->>them?
- ->Because they're too damn dangerous.
-
- -Gee, all kinds? Do remember that there are at least 3 fundamentally
- -different classes of breeder reactors that we know are workable (fast
- -breeders, thermal breeders and spallation reactors). The second of
- -these already has instances in commercial use (Canadian CANDU PHWRs,
- -and the related Indian PHWRs). These can be operated in the
- -thorium/uranium fuel cycle which involves no plutonium, although
- -currently they operated as burners with natural uranium.
-
- One concern I've heard concerning at least some of the breeder cycles is that
- the fuel produced is more easily converted to bomb-grade material than is the
- U238-U235 mix traditionally used in commercial reactors. At the moment, it's
- difficult to guarantee that nobody can steal or divert a sufficient quantity
- of such a material (if it's widely used) to cause trouble. I believe I've
- heard proposals such as deliberately contaminating the fuel with high-level
- waste to make it too dangerous for thieves to handle. Do you have any more
- information on this aspect? And are there designs where the breeder itself
- consumes the fuel it generates?
-
- -With natural uranium currently at $10/lb, and with fossil fuels
- -abundant (too abundant, some might say) breeders (as such) don't
- -currently have sufficient advantages to overcome political and
- -economic obstacles.
-
- How much does uranium sufficiently enriched for use in commercial reactors
- cost? (For that matter, how much does U235-depleted uranium cost?)
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-