| Family | Subfamily | Readiness Level |
| Fission | PWR | 9 |
| MSR | 4 | |
| RMBK | Theoretically unfeasible | |
| CANDU | Theoretically unfeasible | |
| HTGR | Theoretically unfeasible | |
| BWR | Theoretically unfeasible | |
| LMR | 8 | |
| Hybrid Fission-Fusion | Molten salt—Magnetic Confinement | Theoretically unfeasible |
| Molten salt—Inertial Confinement | Theoretically unfeasible | |
| Magnetic Confinement | Theoretically unfeasible | |
| Fusion* | Inertial Confinement | Theoretically unfeasible |
| Magnetic and Inertial Confinement | 3 | |
| Lattice Confinement | 7 |