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Table 4
Calculated relative reproduction factors and fission:capture ratios for two and three-component mixed oxide (MOX) concepts with 1, 2 and 3% by mass plutonium loading in MOX fuel elements.
| Fuel concept description | Reproduction factor (η) | Fission:capture ratio (α−1) | ||||
|---|---|---|---|---|---|---|
| 1%Pu | 2%Pu | 3%Pu | 1%Pu | 2%Pu | 3%Pu | |
| Natural uranium | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| 2.5% enriched UO2 | 1.33 | 1.33 | 1.33 | 2.30 | 2.30 | 2.30 |
| 1.2% enriched UO2 | 1.16 | 1.16 | 1.16 | 1.46 | 1.46 | 1.46 |
| 2.5% UK inventory Pu in DU host [5] (UK CANMOX mimic) | 1.29 | 1.29 | 1.29 | 1.24 | 1.24 | 1.24 |
| 1.8% (U-Th)O2 [20] | 1.11 | 1.11 | 1.11 | 1.28 | 1.28 | 1.28 |
| EPR reprocessed uranium | 1.08 | 1.08 | 1.08 | 1.20 | 1.20 | 1.20 |
| 0.65% UK inventory Pu in DU host | 1.06 | 1.06 | 1.06 | 0.85 | 0.85 | 0.85 |
| 1. Depleted U, UK inventory Pu | 1.14 | 1.26 | 1.31 | 0.98 | 1.18 | 1.28 |
| 2. Depleted U, UO2-EPR Pu | 1.10 | 1.22 | 1.27 | 0.92 | 1.11 | 1.20 |
| 3. Depleted U, MOX-EPR Pu | 1.00 | 1.10 | 1.15 | 0.76 | 0.90 | 0.97 |
| 4. MAGNOX depleted U, UK inventory Pu | 1.15 | 1.26 | 1.31 | 1.01 | 1.20 | 1.30 |
| 5. MAGNOX depleted U, UO2-EPR Pu | 1.12 | 1.22 | 1.27 | 0.96 | 1.13 | 1.22 |
| 6. MAGNOX depleted U, MOX-EPR Pu | 1.02 | 1.11 | 1.16 | 0.80 | 0.92 | 0.99 |
| 7. UO2-EPR reprocessed U, UK inventory Pu | 1.25 | 1.31 | 1.34 | 1.37 | 1.43 | 1.47 |
| 8. UO2-EPR reprocessed U, UO2-EPR Pu | 1.22 | 1.28 | 1.30 | 1.32 | 1.37 | 1.40 |
| 9. UO2-EPR reprocessed U, MOX-EPR Pu | 1.16 | 1.19 | 1.21 | 1.19 | 1.19 | 1.19 |
| 10. Th, depleted U, UK inventory Pu | 0.97 | 1.13 | 1.20 | 0.72 | 0.96 | 1.10 |
| 11. Th, depleted U, UO2-EPR Pu | 0.94 | 1.10 | 1.17 | 0.67 | 0.88 | 1.01 |
| 12. Th, depleted U, MOX-EPR Pu | 0.83 | 0.98 | 1.05 | 0.55 | 0.71 | 0.80 |
| 13. Th, MAGNOX depleted U, UK inventory Pu | 0.98 | 1.14 | 1.21 | 0.75 | 0.98 | 1.12 |
| 14. Th, MAGNOX depleted U, UO2-EPR Pu | 0.95 | 1.10 | 1.18 | 0.69 | 0.90 | 1.02 |
| 15. Th, MAGNOX depleted U, MOX-EPR Pu | 0.85 | 0.99 | 1.06 | 0.58 | 0.73 | 0.82 |
| 16. Th, UO2-EPR reprocessed U, UK inventory Pu | 1.10 | 1.20 | 1.25 | 1.04 | 1.18 | 1.27 |
| 17. Th, UO2-EPR reprocessed U, UO2-EPR Pu | 1.08 | 1.17 | 1.22 | 0.99 | 1.11 | 1.18 |
| 18. Th, UO2-EPR reprocessed U, MOX-EPR Pu | 1.01 | 1.08 | 1.12 | 0.88 | 0.95 | 1.00 |
| 19. Th, AGR reprocessed U, UK inventory Pu | 1.10 | 1.19 | 1.25 | 1.03 | 1.18 | 1.27 |
| 20. Th, natural U, UK inventory Pu | 1.07 | 1.18 | 1.24 | 0.95 | 1.12 | 1.23 |
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