He should probably draw a liquid fluoride thorium reactor, then..
(If you don't know about the LFTR, check out this talk by Kirk Sorensen: http://www.youtube.com/watch?v=AZR0UKxNPh8)
(If you don't know about the LFTR, check out this talk by Kirk Sorensen: http://www.youtube.com/watch?v=AZR0UKxNPh8)
Like nitrogen, the nastiness of flourine is potential. Most actual flourine composites, including those proposed to be used in reactors, are quite stable.