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Table 2.
List of important isotopes for fuel cycle applications and that would benefit from a re-evaluation of their decay data.
| Isotope | Issue | Comment |
|---|---|---|
| 239Np | Decay heat, dose rate | Need for re-evaluation of decay data. |
| 242Cm | Decay heat (very important contributor to MOX decay heat before 2 years) | Discrepancy on its decay energy uncertainties between the libraries (1 order of magnitude between JEFF-3.3 and ENDF/B-VIII.0). The branching ratios 242Am to 242Cm by β− decay is also very important. No uncertainty given in JEFF-3.3. (0.6% in JEFF-3.1.1, 0.3% in ENDF/B-VIII.0). |
| 129I | Reprocessing | Re-evaluation of the 129m Sn precursor of the 129I. |
| 137Cs | Decay heat (+precursor of 137m Ba), burnup estimator | The β− branching 137Cs to 137m Ba is important, no uncertainty given in JEFF-3.3 (0.9436) and inconsistency with ENDF/B-VIII.0 (0.947 ± 0.002). The β− branching of 137Te to 137I, precursor of the Cs and Ba is given as 0.971 in JEFF-3.3 without uncertainty (nor in ENDF/B-VIII.0). |
| 144Ce | Decay heat (+precursor of 144Pr) | Discrepancies on the mean beta decay energy (∼4% not covered by the uncertainties) and missing uncertainty for the branching 44Ce to 144Pr. Discrepancies on the 144Pr mean beta decay energy uncertainty by one order of magnitude between JEFF-3.3 and ENDF/B-VIII.0. |
| 90Sr | Decay heat | The mean beta energy has been increased from JEFF-3.1.1 (174.0 ± 0.5) keV to JEFF-3.3 (193.5 ± 0.5) keV and (195.8 ± 0.8) keV for ENDF/B-VIII.0. The last DDEP evaluation was in 2005. |
| 140La, 132I, 238Pu, 144Pr | Decay heat | Mean decay energy uncertainties to consolidate, discrepancies between libraries. |
| 102, 103Nb, 139Xe | Decay heat | No uncertainty associated to decay mean energies. |
| 131m Te | Dose rate | Half-life, deposited energy. |
| 136Cs | Dose rate | Deposited energy. |
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