Open Access
Table 7.
The main decay heat generators between 4.5 and 20 years cooling time based on the SKB Benchmark [15]. The percent number given each nuclide emphasizes the partial contribution of heat of only one specific nuclide to the total heat produced at a certain time after shutdown.
| 2c∼4.5 y | ∼8.5 y | ||
|---|---|---|---|
| Decay time | Decay time | ||
| 134Cs | 21% | 137Cs/137mBa | 29% |
| 137Cs/137mBa | 20% | 90Sr/90Y | 26% |
| 90Sr/90Y | 19% | 244Cm | 15% |
| 106Ru/106Rh | 11% | 238Pu | 12% |
| 244Cm | 10% | 134Cs | 8% |
| 238Pu | 7% | 241Am | 4% |
| 144Ce/144Pr | 6% | 154Eu | 3% |
| 154Eu | 2% | ||
| 241Am | 1% | ||
| ∼10 y | ∼13.5 y | ||
| Decay time | Decay time | ||
| 137Cs/137mBa | 31% | 137Cs/137mBa | 29% |
| 90Sr/90Y | 29% | 90Sr/90Y | 26% |
| 244Cm | 13% | 238Pu | 18% |
| 238Pu | 11% | 244Cm | 13% |
| 134Cs | 5% | 241Am | 7% |
| 241Am | 5% | 154Eu | 2% |
| 154Eu | 2% | 134Cs | 1% |
| 240Pu | 1% | 240Pu | 0% |
| ∼21.5 y | |||
| Decay time | |||
| 137Cs/137mBa | 32% | ||
| 90Sr/90Y | 29% | ||
| 238Pu | 14% | ||
| 244Cm | 12% | ||
| 241Am | 9% | ||
| 240Pu | 2% | ||
| 154Eu | 1% | ||
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