The start of my looking into "What Nuclear Is" - I figure it's no good criticising either the US or anyone else if I have no idea about the arguments at stake, i.e. those over nuclear capability.
Part 1: Types of Nuclear Reactors
Note that the HWR is pretty multi-purpose, but I don't know yet as to why it might offer advantages over other, non-ambiguous tech. Apparently the Canadians use HWR, too. Also note that the HWR being built by Iran could use a metal fuel, which goes against what the BBC are saying. In fact, the BBC guide seems to be quite biased in terms of pointing out what can be achieved with various bits of kit, not what has been achieved elsewhere, say.