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- Newsgroups: sci.space
- Path: sparky!uunet!spool.mu.edu!darwin.sura.net!udel!rochester!dietz
- From: dietz@cs.rochester.edu (Paul Dietz)
- Subject: Re: Breeder reactors
- Message-ID: <1992Dec22.152934.2024@cs.rochester.edu>
- Followup-To: sci.energy
- Organization: University of Rochester
- References: <BznFpx.93v.1@cs.cmu.edu>
- Distribution: sci
- Date: Tue, 22 Dec 1992 15:29:34 GMT
- Lines: 40
-
- In article <BznFpx.93v.1@cs.cmu.edu> roberts@cmr.ncsl.nist.gov (John Roberts) writes:
-
- > 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?
-
- (I've redirected followups to sci.energy.)
-
- Let me preface this by observing that in a world where countries are
- getting richer and more productive, the only long term way to keep
- countries from making bombs is to have them not want to make bombs.
- This is true even if our energy sources are non-nuclear. Nuclear
- terrorism, I think, is overrated; chemical terrorism is much easier,
- after all, and as deadly, but has not yet occured.
-
- There are nuclear fuel cycles that make the fuel less easily diverted
- (although none is completely safe.) The pyrometallurgical process for
- reprocessing spent fuel developed at ANL leaves the reprocessed
- actinides contaminated with sufficient high level waste to make
- diverting them difficult. This process is pretty simple (just 3 or 4
- basic steps) and could be done on-site.
-
- Thorium-based cycles would make U-233. This could be spiked
- with U-232, which would make the fuel a fairly strong gamma emitter.
- This would make its diversion difficult and easily detectable.
-
- Since this discussion was in the context of space resources, do
- remember that to make a significant impact on terrestrial resource
- demands, space industry would involve the manipulation of billions of
- tons of material per year. A 60,000 ton object dropped on the earth
- hits with a yield of at least a megaton.
-
- Paul F. Dietz
- dietz@cs.rochester.edu
-