In this study, a modified two-dimensional geometry model was employed comprised of metal cladding, a metal matrix, and dispersed fuel particles. And an analysis method was established to simulate the thermal–mechanical behavior of dispersed plate-type fuel under the Reactivity Insertion Accident (RIA). Key fuel properties including thermal performance, mechanical behaviors and irradiation effects were considered. All these models were coded in the ABAQUS subroutines and solved. The influences of heat transfer deterioration, fission gas and burnup were investigated. Significant parameters to describe the performance of the fuel element, such as temperature, von Mises stress and strain profile, were evaluated. The results indicate that the deterioration of the heat transfer in the flow channel and the deepening burnup increase stress and strain of the dispersed plate-type fuel. The fission gas causes the crack of the fuel particles.

在这项研究中，采用了由金属包壳、金属基体和分散的燃料颗粒组成的改进的二维几何模型。并建立了一种分析方法来模拟反应性插入事故（RIA）下分散板型燃料的热力学行为。考虑了包括热性能、机械行为和辐照效应在内的关键燃料特性。所有这些模型都在 ABAQUS 子程序中编码并求解。研究了传热劣化、裂变气体和燃耗的影响。评估了描述燃料元件性能的重要参数，例如温度、von Mises 应力和应变曲线。结果表明，流道内传热的恶化和燃耗的加深增加了分散板式燃料的应力和应变。裂变气体导致燃料颗粒破裂。