> I was just reading about those a couple days ago. Here's a link to the
> wikipedia entry: http://en.wikipedia.org/wiki/Pebble_bed_reactor

An excellent overview of the subject.
The Pebble Bed concept sounds  excellent, but one would still want to be
extremely cautious with the technology (james' enthisiasm for things nuclear
notwithstanding).

Note the AVR :-)

Note the Windscale "accident" from neutron induced Wigner energy while
annealing graphite to prevent exactly what they caused.
This list of nuclear accidents

        http://en.wikipedia.org/wiki/List_of_nuclear_accidents

gives some idea of things that just go wrong. odds are that PB will be safer
but still open to accident. Safer is good.




        RM



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