My preferred reactors are.
Molten sodium cooled fast reactor in both Aalo sized modular and BN1200 sized gigawatt scale.(reprocessing off site like Rosatom does)
Integral Fast Reactor (IFR) with dozens of 500MW modules all sharing a single reprocessing plant onsite
Molten salt cooled fast reactor with on-site metal fuel reprocessing for high temp applications 1000C+ with NaCl salts.
D-D catalyst fusion fission hybrid breeder with stainless clad metal uranium first wall fuel pins as the neutron multiplication and fission energy booster 50-200x energy gains vs fusion Q level. Surrounded by a water breeding blanket with light water for neutron capture to deuterium fuel and 7% uranium nitrite for Pu breeding of crazy amounts per year 8000kg for 1000mw of fission hybrid thermal in the inner part. You can also use stainless clad metallic actinides instead of uranium for the fission multiplier Np,Am,Cf all have higher multiplication rates vs U238 since they fast and thermal neutron fission plus you are burning up all the long lived trans uranium elements in one go. The support ratio for my next face reactor can reach 100+ to one.
CANDU in a slightly enriched MOX fueled at 1.2% Pu 239 for triple the fuel life vs natural uranium and one third rhe spent fuel mass to reprocess. You only need to remove fission products and add Pu239 back to 1.2% given CANDU conversion ratio of 0.8 you need 40 ish kg per year of Pu239 from the hybrid breeder.using this slightly enriched MOX fuel cycle a single 1gigawatt fusion fission hybrid supports 200 one gigawatt CANDU. <<<<this is the way.
CANDU are cheap to build the S.Koreans did them for $2800/kw on time and on budget. Do more everywhere and in bulk there is no shortage of deuterium it’s 46 trillion tonnes in the ocean.
Graphene makes for a much better way to get at deuterium not only in seawater but in that liquid breeder blanket too. Even without graphene tech existing methods more than efficient enough. The heavy water doesn’t get used up in a CANDU it’s recycled ,purified and reused only small amounts of make up are needed for the kg lost to neutron captures to tritium but that’s...fusion fuel for the hybrid feeding the CANDU it closes the cycle elegantly.
No matter what science develops, as long as it has the name ‘nuclear’ in it’s title, the Envirowhackos will vilify it so that the public will not accept it. Even if by some fortuitous miracle they get a fusion reactor to work, it will be protested and brought to naught.
They don’t want any cheap and long lasting energy sources at all. They may say they do, but the powers that be do not. Limitless energy means freedom and that is not allowed. ...................