Failure of coated fuel particles during thermal excursion above 2,000.DEG.C.

概要

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In an attempt to obtain information on survival temperature limit for TRISO parti-cles, out-of-pile heating experiment was carried out on unirradiated, unbonded particles. Catastrophic failure resulting in the formation of a hole like a volcano crater occurred during heating at 2, 2502, 300°C for 2035 min. Although the failure temperatures were lower than the melting point of the kernel material (UO<SUB>2</SUB>), visual and microscopic observations of failed particles suggests kernel melting. Failure of SiC layer was detected after heating at temperatures as low as 2, 130°C. At 2, 560°C, SiC layer disappeared completely. A similar heating experiment on particles embedded in graphite matrix was carried out for the purpose of comparison. The embedded particles survived higher temperature excursion than in the case of the unbonded particles. Effects of heating on OPTAF of PyC and on crushing strength of particles are also reported.
一般社団法人日本原子力学会の論文