Cesium Release and Transport in Biso-Coated Fuel Particles

Simulated fission product oxide behavior in Triso-coated HTGR fuel

“…As U0" undergoes fission, the solid fission products separate principally into three phases: (1) oxides that are insoluble in the remaining U0", (2) oxides that are in solid solution with the U0", and (3) metallic 15 inclusions.…”

Release Behavior of Metallic Fission Products from Pyrocarbon-Coated Uranium-Dioxide Particles at Extremely High Temperatures

“…( 1 ) ( 2) Error in the fractional release was estimated to be within a factor of 1.5 for all the fission products detected except 155 Eu, and within a factor of 4 for this nuclide. It was confirmed after the final heating that R agreed with 1-F within a factor of 1.1 except for 155 Eu in most cases, and in all cases within the above factors of 4 and 1.5 for 155 Eu and the rest of nuclides, respectively.…”

Deep-Burn Modular Helium Reactor Fuel Development Plan

“…There are limited data on the diffusive release of fission gases from BISO particles (Morgan 1977), but the relevance of these data to the transport of gases in the OPyC coatings of TRISO particles has to be confirmed. In any case, the available data indicate that the OPyC coating under MHR core conditions will retain the short-lived fission gases.…”