Abstract
Kernel migration of TRi-structual ISOtopic (TRISO) fuel for High Temperature Gas-cooled Reactor (HTGR) has been analyzed to investigate the potential dominating effects. Kernel migration is a major fuel failure mode and dominant to determine the lifetime of the fuel for High Temperature engineering Test Reactor (HTTR). However, the result and reliability depend on the evaluation method. Therefore, we propose the recommendation method by taking into account of actual distribution of Coated Fuel Particles (CFPs) and the resulting heterogeneous fuel temperature calculation with such distribution. As a result, the evident and conservative method can be proposed, and the method shows that the Kernel Migration Rate (KMR) is predicted to be about 10% less compared with the most conservative evaluation.
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