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SiC‐Fission Product Reactions in HTGR TRISO UC 2 and UC x O y Fissile Fuel: I, Kinetics of Reactions in a Thermal Gradient
Author(s) -
SMITH C. L.
Publication year - 1979
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1979.tb12741.x
Subject(s) - nuclear fission product , fission products , materials science , fissile material , fission , kinetics , radiochemistry , chemical kinetics , analytical chemistry (journal) , chemistry , nuclear physics , neutron , physics , quantum mechanics , chromatography
The potential for SiC‐lanthanide fission product reactions on the cool side of TRISO‐coated UC 2 and UC 4.3 O 1.3 fuel particles was studied in postirradiation thermal‐gradient heating experiments. The kinetics of the reactions were obtained by determining the rate of decrease in SiC thickness as‐a function of temperature and fission density. Reaction rates are independent of the fission density for UC 2 kernel burnups >5% FIMA. The rate of change in SiC thickness for TRISO UC 2 in a temperature gradient is X (μm/h) = 4.2×10 7 exp(‐3.283×10 5 /8.313 T ). No reduction in SiC thickness was observed in TRISO UC 4.3 O 1.3 fuel; the rates of SiC fission product reactions are at least an order of magnitude slower than those observed in UC 2 . No metallic fission product release from TRISO particles was indicated until the SiC layer thickness was reduced by 50%.