Abstract
The irradiation of microspheres of ThO2 and Th0.81U0.19O2in the form of high‐temperature gas‐cooled reactor (HTGR) particles resulted in the buildup of CO as well as Kr + Xe within the particle. The particles were later equilibrated at 1325T2270 K, crushed, and the CO and Kr + Xe contents were measured. Oxygen released as CO can be represented by the expression O/f=74.6F exp (–7400/T), where O/f is the moles of oxygen released per mole of fissioned actinide, F is fission per initial heavy‐metal atom, and T is the equilibration temperature. This oxygen release is reasonably consistent with that predicted from thermodynamic data for the oxides of the fuel and fission products. The burnup dependence of the release of Kr and Xe to the void space within the particle was consistent with published data and approached the theoretical value for the 233u‐235U system, (Kr+Xe)/f0.32.
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