Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (8): 80604-080604.doi: 10.11889/j.0253-3219.2019.hjs.42.080604

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Optimization of TRISO fuel particle for thorium-based pebble bed fluoride salt-cooled high-temperature reactor

Yonghan FANG1,2,3,Xiangzhou CAI1,2,3(),Jingen CHEN1,2,3(),Jifeng HU1,2,Xiaoxiao LI1,2,Chenggang YU1,2,Jianhui WU1,2,Deyang CUI1,2   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. Innovative Academies in TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-03-06 Revised:2019-05-07 Online:2019-08-10 Published:2019-08-26
  • Contact: Xiangzhou CAI,Jingen CHEN;
  • About author:FANG Yonghan, male, born in 1988, graduated from Yantai University in 2011, doctoral student, focusing on Th-U fuel cycle
  • Supported by:
    Strategic Priority Research Program of Chinese Academy of Sciences(XDA02010000);Frontier Science Key Program of Chinese Academy of Sciences(QYZDY-SSW-JSC016)

Abstract: Background

Thorium-based pebble bed fluoride salt-cooled high-temperature reactor (PB-TFHR) is one of the reactor types in the fourth generation reactors. It uses pebble fuel design filled with TRISO (TRi-structural ISOtropic) coated fuel particles dispersed in a graphite matrix and has good neutronic and safety performances.


This study aims at the radius of kernel, thickness and density of coating layers of TRISO in PB-TFHR for neutron properties, the production of fission gas with krypton, xenon and iodine, and failure rate of coated fuel particles. It can provide a design reference for the reactor physics of FHR.


The Standardized Computer Analyses for Licensing Evaluation (SCALE) 6.1 program and the corresponding submodules such as burnup and cross section processing were used to calculate the critical and burnup for the PB-TFHR and the PANAMA model was used to calculate the failure rate of TRISO coated fuel particles.


The results show that when the thickness and density of coating layers are maintained unchanged, a larger radius of kernel (≥0.01 cm) is required to meet the requirement that the reactor is under-moderated while the temperature feedback of core is always negative. When the thickness and density of the coating layers keep constant, at the same burnup, the smaller the radius of kernel is, the less fission gas is produced and the smaller the failure rate is. When the density of coating layers is not changed, variations of the thickness of the porous carbon buffer and the inner pyrolytic carbon layer have a great influence on the keff whilst keeping the thickness of the coating layers unchanged, only changing the density of the coating layers does not affect the keff obviously.


The analysis of this study give the optimal structure of TRISO coated fuel particle and provide some reference for the physical design.

Key words: PB-TFHR, Pebble, TRISO, Burnup, Failure rate

CLC Number: 

  • TL99