Abstract
Structural integrity of SiC layers on TRISO‐coated HTGR fuel particles is a critical property necessary to ensure fission product retention. Characterization and detection of microcracks in SiC layers by high‐pressure (69 MPa) mercury intrusion is discussed. Particular emphasis is placed on relating metallic and gaseous fission‐product release to the level of defective SiC layers. Gaseous fission‐product release during irradiation is shown to be more accurately predicted when the fraction of defective SiC layers as determined by mercury intrusion is taken into account.
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