Research Article
PSI Methodologies for Nuclear Data Uncertainty Propagation with CASMO-5M and MCNPX: Results for OECD/NEA UAM Benchmark Phase I
Table 5
Effect of changing the perturbation group structure for the PB-2 HZP cell case.
| Parameter | Perturbation group structure | 19-group | 31-group | 44-group |
| Eigenvalue | 0.55% | 0.55% | 0.54% | U-235 abs. | 0.99% | 0.99% | 0.92% | U-235 fis. | 1.01% | 1.02% | 0.94% | U-238 abs. | 1.08% | 1.07% | 1.03% | U-238 fis. | 3.70% | 3.67% | 3.73% |
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