I don't think you are supposed to create tritium via UUM.
Than there is no point in using clay,it's friggin rare resource,and you should waste 20 clay and 1 deiterium for one tritium,which is worth 1 280 000 -my guess,that using a nuke reactor without chambers with a single uranium and 4 coolant cells is WAY more efficient
If isotopic separator for lithium-6 would give a 10% rate (roughly 10 clay per tritium),than 4 tritium would make 5 u-matter >>> 48 clay,which would be roughly 5 tritim,which is more or less profitable (or I'm way too rough here >_>)
Still,clay isn't something,that is wasted - it is a highly needed resource,and this update isn't worth wasting it,IMHO
Still,a fusion reaction is waay too funny here,making 1 H-3 from 1 Li-6 and so on.
Shame,we can't use nuclear 