| Abstract Scope |
The TRISO particle is a composite material which contains a uranium bearing kernel, enclosed sequentially by a buffer, IPyC, SiC, and OPyC layers. TRISO particles are susceptible to potential failures under irradiation conditions in the reactor core, including overpressure failure, irradiation-induced IPyC cracking, debonding between coating layers, and buffer tearing. In particular, the advanced gas reactor (AGR) Post Irradiation Examination (PIE) shows that IPyC cracking in particles with failed SiC was either directly related to the buffer fracture or to the shrinking buffer pulling away from the IPyC. Such a strong interaction between different layer failure has not yet been investigated. In this talk, we will discuss the recent modeling progress in TRISO failure modeling. The damage initiation and propagation will be simulated by a phase-field fracture approach developed in BISON. These models will be used to investigate the consequent failures of the buffer, IPyC and SiC layers. |