Licensing Topical Report: The Measurement and Modelling of Time-Dependent Fission Product Release from Failed HTGR Fuel Particles under Accident Conditions

摘要

The release of fission products from failed fuel particles was measured under simulated accident (core heatup) conditions. A generic model and specific model parameters that describe delayed fission product release from the kernels of failed HTGR fuel particles were developed from the experimental results. The release of fission products was measured from laser-failed BISO ThO sub 2 and highly enriched (HEU) TRISO UC sub 2 particles that had been irradiated to a range of kernel burnups. The burnups were 0.25, 1.4, and 15.7% FIMA for ThO sub 2 particles and 23.5 and 74% FIMA for UC sub 2 particles. The fission products measured were nuclides of xenon, iodine, krypton, tellurium, and cesium. (ERA citation 05:029088)