TY - JOUR
T1 - Numerical analysis of effective thermal conductivity of FCM with multilayer TRISO particle
AU - Gong, Junjie
AU - Yuan, Ruidi
AU - Song, Xiaoqing
AU - Wang, Yongxin
AU - Liu, Bing
AU - Liu, Malin
N1 - Publisher Copyright:
© 2023 The Author(s)
PY - 2023/9
Y1 - 2023/9
N2 - Fully Ceramic Microencapsulated (FCM) fuel, consisting of tristructural-isotropic (TRISO) and SiC matrix, has engaged significant attention owing to its unmatched accident tolerance and excellent heat transfer efficiency. The effective thermal conductivity (ETC) is of great significance when evaluating the thermal efficiency and safety of nuclear fuel. In this study, the finite element method (FEM) is used to model the ETC of full 3D FCM pellets. The effects of several factors on the ETC of the FCM were mainly investigated, such as the volume fraction, components properties, and the distribution of TRISO particles. The numerical ETC was compared to analytical models in the literature, the most appropriate analytical model was recommended and the accuracy of the developed numerical model was verified. The performed calculation showed that the ETC of the pellet is negatively correlated with the volume fraction of the TRISO particles. In addition, we found that the distribution of particles has a noticeable effect on the ETC of the pellet, and the relationship is fitted by data mining. Based on the results of the calculations, two routes to improve the ETC of the FCM pellet are proposed, one is to increase the thermal conductivity of the buffer layer and the matrix in the TRISO particle and the other is to disperse the TRISO particles by optimizing the preparation process. The present study provides theoretical support for the analysis and improvement of the FCM design and fabrication in the future.
AB - Fully Ceramic Microencapsulated (FCM) fuel, consisting of tristructural-isotropic (TRISO) and SiC matrix, has engaged significant attention owing to its unmatched accident tolerance and excellent heat transfer efficiency. The effective thermal conductivity (ETC) is of great significance when evaluating the thermal efficiency and safety of nuclear fuel. In this study, the finite element method (FEM) is used to model the ETC of full 3D FCM pellets. The effects of several factors on the ETC of the FCM were mainly investigated, such as the volume fraction, components properties, and the distribution of TRISO particles. The numerical ETC was compared to analytical models in the literature, the most appropriate analytical model was recommended and the accuracy of the developed numerical model was verified. The performed calculation showed that the ETC of the pellet is negatively correlated with the volume fraction of the TRISO particles. In addition, we found that the distribution of particles has a noticeable effect on the ETC of the pellet, and the relationship is fitted by data mining. Based on the results of the calculations, two routes to improve the ETC of the FCM pellet are proposed, one is to increase the thermal conductivity of the buffer layer and the matrix in the TRISO particle and the other is to disperse the TRISO particles by optimizing the preparation process. The present study provides theoretical support for the analysis and improvement of the FCM design and fabrication in the future.
KW - Data mining
KW - Effective thermal conductivity
KW - Finite element method
KW - Fully ceramic microencapsulated (FCM) fuel pellet
KW - Tristructural-isotropic (TRISO) fuel particle
UR - http://www.scopus.com/inward/record.url?scp=85172935254&partnerID=8YFLogxK
U2 - 10.1016/j.nme.2023.101501
DO - 10.1016/j.nme.2023.101501
M3 - 文章
AN - SCOPUS:85172935254
SN - 2352-1791
VL - 36
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
M1 - 101501
ER -