Provides thermal power used by thrusters, the powerplant, auxiliary generators, and some other equipment
| Name | Manufacturer | Operating Temperature | Failure Point | Thermal Power | Mass | Price |
|---|---|---|---|---|---|---|
| 8x SO6 fuel rod | Rusatom-Antonoff | 3,500 K | 4,500 K | 8 GW | 4,000 kg | 16,000 E$ |
| 4x SO6 fuel rod | Rusatom-Antonoff | 3,500 K | 4,500 K | 4 GW | 2,000 kg | 80,000 E$ |
| 12x SO6 fuel rod | Rusatom-Antonoff | 3,500 K | 4,500 K | 12 GW | 6,000 kg | 240,000 E$ |
| 16x SO6 fuel rod | Rusatom-Antonoff | 3,500 K | 4,500 K | 16 GW | 8,000 kg | 320,000 E$ |
| 20x SO6 fuel rod | Rusatom-Antonoff | 3,500 K | 4,500 K | 20 GW | 10,000 kg | 400,000 E$ |
| Nakamura Dynamics Yama-SSR12 | Nakamura Dynamics | 3,000 K | 4,500 K | 30 GW | 5,000 kg | 750,000 E$ |
| Nakamura Dynamics Yama-SSR16 | Nakamura Dynamics | 3,000 K | 4,500 K | 40 GW | 5,500 kg | 1,000,000 E$ |
| Nakamura Dynamics Yama-SSR16S | Nakamura Dynamics | 3,000 K | 4,500 K | 50 GW | 6,000 kg | 1,500,000 E$ |