I'm always surprised that the CANDU[1] reactor isn't more popular, as you don't require uranium enrichment, can use a mix of fuels, and has a number of fail-saf

I'm always surprised that the CANDU[1] reactor isn't more popular, as you don't require uranium enrichment, can use a mix of fuels, and has a number of fail-safes that work without power -- such as gravity-dropped control rods into the low pressure chamber, and requiring the moderator (deuterium in the original models) to be present to maintain a reaction. [1] https://en.m.wikipedia.org/wiki/CANDU_reactor https://en.m.wikipedia.org/wiki/CANDU_reactor