Nuclear Decay Heat Curves: MOX
Decay heat power fraction vs time after shutdown for nuclear reactor design and spent fuel management. Covers U-235 thermal fission, U-238 fast fission, Pu-239 thermal fission, standard PWR (45 GWd/tHM), standard BWR (45 GWd/tHM), and MOX fuel per ANSI/ANS-5.1-2014. Time range: 1 second to 10 years. Includes dominant isotope contributors and 2-sigma uncertainty.
| fuel type | time after shutdown s | burnup GWd per tHM (GWd/tHM) | decay heat fraction of operating power (dimensionless) | dominant isotope contributors | enrichment pct (%) | notes | standard | uncertainty pct 2sigma (%) |
|---|---|---|---|---|---|---|---|---|
| MOX | 1 | 45 | 0.068 | Ba-140+La-140+Y-91+Pu-isotopes | 6 | MOX fuel (mixed oxide UO2/PuO2); 45 GWd/tHM; ~6% Pu equivalent enrichment; higher initial decay heat than UO2 due to higher fissile Pu fraction and higher Pu actinide inventory | ANS_5.1_2014 | 6 |
| MOX | 3,600 | 45 | 0.02 | Np-239+I-131+Ba-140+La-140+Pu-241 | 6 | 1 hour; MOX 45 GWd/tHM; similar to UO2 at short times as FP decay dominates; Pu-241 t1/2=14.4y contribution begins accumulating Am-241 in long-term | ANS_5.1_2014 | 5 |
| MOX | 86,400 | 45 | 0.0106 | La-140+Ba-140+Np-239+Pu-FPs | 6 | 1 day; MOX slightly higher than UO2 due to higher Pu fission contribution | ANS_5.1_2014 | 3 |
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