Research on the In-pile Performance of Fully Ceramic Microencapsulated Fuel under Multi-physics Field
In order toresearch the in-pile performance of fully ceramic microencapsulated fuel(FCM),and evaluate the safety and optimize the structure of FCM fuel,two dimensional characteristic model was used to analysis the thermal-mechanical performance of FCM.The internal pressure of TRISO particle was used as input parameters by calculating the single particle.Kernal and buffer layer were deducted because of the dissociation of the two parts.Hence,multi particles mapping during modeling was avoided.The effect of structure on the performance of FCM was studied by establishing units with different structure parameters.The results indicate that the maximum temperature of SiC matrix under normal condition of PWR environment was about 1390 K,which was lower than the decomposition point of SiC.The maximum hoop stress of SiC matrix especially the inner part was up to about 1200 MPa,and the hoop stress of non-fuel region part was lower than the inner part,which can be attributed to the deformation of TRISO particles.The hoop stress of SiC layers was only about 180 MPa,and the failure probability of SiC layer was lower than 9×10-5,thus the integrity of SiC layers and the fission product capability were maintained.The analysis method established in this study can be used in engineering application and structure optimizing of FCM pellet.
Fully Ceramic Microencapsulated Fuel(FCM)thermal-mechanical performancestructure integrityfailure probability
万方数据
维普
