Abstract
Canadian Nuclear Laboratories (CNL) has many decades of thoria research and development experience, including fabrication, irradiation testing, and post–irradiation examination. CNL has previously shown fission gas release (FGR) to be dependent on fuel microstructure in thoria fuels. Lower density fuel with large granules surrounded by porous regions results in higher FGR. Higher and more uniform density fuel results in superior FGR results in thoria fuels with a similar irradiation history. In this paper, this effect of fuel microstructure on FGR is shown empirically using the most recent post–irradiation examination (PIE) results of CNL’s DME-176 and DME-221 thoria experiments. Previously reported PIE results of CNL’s BDL-422 and DME-221 thoria experiments are also compared.
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