Table 2.
Some global neutronic parameters, material absorption rates, and their differences due to hydrogen migration. “Result Value” is the value calculated from the final OpenMC run. The difference and relative difference are calculated by comparing the Result Value to the OpenMC results from a coupled simulation where hydrogen concentration is constant. “AR” stands for absorption rate, and has units of absorptions per source particle. “Thermal FF” is the thermal fission factor, the fraction of fissions that are caused by incident neutrons below 4 eV.
| Quantity | Result Value | Dif. | Rel. Dif. (%) |
|---|---|---|---|
| Eigenvalue | 1.04433 ± 0.00020 | 0.00265 ± 0.00028 | – |
| Leakage | 0.72630 ± 0.00013 | –0.00079 ± 0.00018 | –0.11 ± 0.02 |
| Thermal FF | 0.78750 ± 0.00007 | 0.00151 ± 0.00009 | 0.19 ± 0.01 |
| UO2 AR | (5.94 ± 0.00)e–1 | (0.96 ± 0.15)e–3 | 0.16 ± 0.03 |
| SS316 AR | (8.96 ± 0.00)e–3 | (5.8 ± 1.1)e–5 | 0.66 ± 0.13 |
| Potassium AR | (2.26 ± 0.04)e–5 | (5 ± 6)e–7 | 2.2 ± 2.6 |
| BeO AR | (2.01 ± 0.00)e–2 | (–5.1 ± 1.1)e–5 | –0.24 ± 0.05 |
| ZrH AR | (4.78 ± 0.00)e–2 | (4.0 ± 0.2)e–4 | 0.84 ± 0.04 |
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