Determination of oxygen to uranium ratio in irradiated uranium dioxide by controlled potential coulometry

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

“…In this respect, the modified spectrophotometric method by Kihara et al [19], which has been frequently utilized for U-Me-O systems [18], and other chemical methods likewise based in the determination of the U 4+ /U 6+ ratio in solution (e.g. flow coulometry, polarography), as those early used for UO 2+x [62] and already put in practice for low burn-up irradiated LWRfuels [20,21], may be worthwhile to be explored for the high burn-up fuels.…”

“…Also, determinations of the oxygen stoichiometry via chemical methods (e.g. spectrophotometry, coulometry) in spent LWR-fuels had been up to now rare, with only two known cases in the open literature at burn-ups of 2.5 [20] and 34 GWd/tM [21]. For this reason, a reasonable way to estimate the oxygen stoichiometry of the irradiated fuel remains the comparison of the measured oxygen potential, e.g.…”