Nuclear Decay Heat Curves: standard_BWR
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 (%) |
|---|---|---|---|---|---|---|---|---|
| standard_BWR | 1 | 45 | 0.0645 | Ba-140+La-140+Y-91+Zr-95 | 3.8 | Standard BWR UO2 fuel; 45 GWd/tHM; 3.8% initial enrichment; slightly lower Pu fraction than PWR; initial decay heat fraction per Todreas & Kazimi Table 3-3 BWR reference | ANS_5.1_2014 | 3 |
| standard_BWR | 3,600 | 45 | 0.0188 | Np-239+I-131+Ba-140+La-140 | 3.8 | 1 hour; BWR slightly lower than PWR due to lower average specific power and lower Pu fraction; 45 GWd/tHM BWR composite | ANS_5.1_2014 | 3 |
| standard_BWR | 86,400 | 45 | 0.01021 | La-140+Ba-140+Np-239 | 3.8 | 1 day; BWR 45 GWd/tHM; slightly lower than PWR at same burnup due to lower Pu-239 fraction from lower thermal flux history | ANS_5.1_2014 | 2 |
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