In another thread http://en.wikipedia.org/wiki/Shippingport_Atomic_Power_Station was mentioned. I went to the link, thinking "okay, I remember this one, the first commercial reactor exclusively for electricity generation, not weapon needs. Mostly only historical interesting..." I was reading the article at leisure when it struck me. It was a U-233/thorium reactor. It was a light water reactor. It was a breeder. It succeeded in demonstrating that breeding was achieved. WAIT A SECOND. The light water thorium breeder. The holy grail of unlocking full energy reserves of thorium and possibly all uranium too (as opposed to only using U-235, a much more scarce resource). We already had it, and it *worked*. In *1982*. Why our today's reactors aren't light water thorium breeders, then? Why Indians are torturing themselves trying to build a heavy water breeder, which is more expensive and has some additional problems such as tritium generation? Why did US and other nations spent lots of effort trying to develop fast breeders, which have significant problems too?