Oxygen stoichiometry shift of irradiated LWR-fuels at high burn-ups: Review of data and alternative interpretation of recently published results

Progress in understanding fission-product behaviour in coated uranium-dioxide fuel particles

“…This clearly indicates that molybdenum was not fully oxidised during irradiation, i.e., in agreement with the MFPR result which additionally provides the value of the oxygen potential, À455 kJ mol À1 . This value may appear to be slightly too low in comparison with the oxygen-potential database compiled by Spino et al [14] for PWR irradiated UO 2 which indicates, for a similar burn-up, a higher value (i.e., >À450 kJ mol À1 ), even if these values are not directly comparable due to the difference of enrichment between PWR fuel and HTR fuel kernels.…”

“…It can be noted that even calculation of the oxygen potential with a complete thermochemical database should also be regarded as approximate given the incomplete knowledge of FP behaviour in the UO 2 kernel. Additionally, the burn-up dependence of the oxygen potential in irradiated fuels remains today an intensely debated point in the literature (see [13,14]). For these reasons, here, the thermodynamic calculations are presented as a function of oxygen potential.…”

Thermochemical assessment of oxygen gettering by SiC or ZrC in PuO2−x TRISO fuel

“…1. Phases expected to be present are those typical for high burnup fuels, although some disagreement exists regarding the formation of some phases, most notably those containing cesium and/or molybdenum [13][14][15][16][17][18].…”

Fuel Performance of Light Water Reactors (Uranium Oxide and MOX)

“…The accumulation of irradiation point defects and dislocation loops. 42 The accumulation of gaseous fission products, nonsoluble in UO 2 . A partial recovery however exists, activated by the fission energy.…”

“…The more recent state of understanding is described by Baron et al, 45 but a large number of good publications are focused on the analysis of the phenomenon, 11,19,42,[46][47][48][49] or more recently by multiscale approach. 50 As a complement to the national survey programs, HBS was investigated in several international parametric experimental studies, mainly the following projects: High Burn-up Effect Program (HBEP), 10 High Burn-up Rim Project (HBRP), 11,[51][52][53] HBRP_NT, 15 and some new projects such as New Cross over Project (NXO) 50 and F-Bridge.…”