This is my thoughts of it.
The plan B would be the D+D reaction or in best case D+He3. It may be best to reduce availability of uranium and production of radioactive waste.
Plan C may be If only the D+T reaction can be made.
This can be used in some hybrid reactor. A new generation of accelerator driven nuclear fission reactors is developing. These reactors can use U238, Thorium and radioactive waste as flue. They are safe and produce little amount of waste. To replace the accelerator with a DT burning DPF can increase it
