I find the answers below most useful; the report in Neutron News in particular escaped my attention. Thanks again for the quick and comprehensive response.
See IAEA database of research reactors http://www.iaea.org/worldatom/rrdb/ (Martyn Bull)
See also: http://www.ch.iucr.org/cww-top/rad.index.html (Howard Flack)
The Egyptian facility was featured in the last (Vol 11, Issue 2) Neutron News (Steve King)
(If you don't have it, I (AH) have a PDF version).
For Argentina, try http://www.cab.cnea.gov.ar/ (Spencer Howells)
Start at www.invap.com.ar because all were built by the Argentineans.
A database has been assembled by Brian Dodd at www.iaea.or.at/worldatom/rrdb
Bob Williams and Hank Prask
Argentina just won the bid to build the new ANSTO reactor http://www.ansto.gov.au/info/press/2000_06.html (Bill Buyers).
Thanks also to Judith Howard, Ian McLure, Andres Goeta, Mike Johnson, Jaime Fernandez-Baca and Janet Wallace.
Alan H.
Dr Alan W. Hewat, Diffraction Group Leader,
Institut Laue-Langevin Grenoble FRANCE <[EMAIL PROTECTED]> tel (33) 4.76.20.72.13
ftp://ftp.ill.fr/pub/dif fax (33) 4.76.20.76.48 http://www.ill.fr/dif/