PROCESS MODELING AND SIMULATION TO DEVELOP UO 2 -TRISO COATED PARTICLE FOR INDIAN HIGH TEMPERATURE REACTORS

This work reports process modeling and its simulation to fabricate TRISO (TRistructural-ISOtropic) coated Uranium Oxide particle. The development of TRISO coating on spherical fuel microspheres of 500 µm size was carried out in a hot spouted bed reactor by chemical vapor deposition. A particle growth model is proposed and simulated to fix process parameters for TRISO coating in a single campaign. The coating thickness of each layer is controlled using indigenously developed pressure fluctuation technique. Results shows the potential of present process to arrive at uniform TRISO coated particles with specified coating thickness and corresponding coating densities. Shri P.K. Mollick is the recipient of the DAE Young Engineer Award for the year 2012