Utilizing neutronics modelling to predict changing Pu ratios in UO2 in the presence of Th
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The isotopic fractions of plutonium produced in a reactor are of significant value as nuclear forensic signatures, and the mechanisms of their production and alteration should be investigated thoroughly. A series of neutronics calculations were made on a typical UO2 PWR setup, introducing (Th, U)O2 MOX rods gradually, to investigate how the presence of Th affects the 240Pu/239Pu and 242Pu/239Pu ratios in the remaining UO2 fuel rods. A relationship is found that links the percentage change in these ratios, with the burnup and Th content in the configuration. In an extreme case, it was found that the presence of Th may increase the ratio of 242Pu/239Pu by as much as 3.5% at low burnup.
| Original language | English |
|---|---|
| Article number | 103762 |
| Journal | Progress in Nuclear Energy |
| Volume | 137 |
| Early online date | 2 May 2021 |
| DOIs | |
| Publication status | Published - 1 Jul 2021 |
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