Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (01): 10601-010601.doi: 10.11889/j.0253-3219.2014.hjs.37.010601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Investigation of fission product gas formation in TRISO Th/U coated fuel particles

YIN Wenjing1,2 ZHANG Haiqing1 CAO Changqing1 LIN Jun1 ZHU Zhiyong1   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2013-10-18 Revised:2013-11-07 Online:2014-01-10 Published:2014-01-20
  • Supported by:

    “Strategic Priority Research Program" of the Chinese Academy of Sciences (TMSR project)

Abstract:

Background: Fission product gas accumulation in Tri-structural iso-tropic (TRISO) coated fuel particles can cause the failure of TRISO fuel elements. Purpose: The aim is to study the fission product gases (xenon and krypton) accumulation in UO2 and ThO2 coated particles with respect to various neutron spectra and neutron flux. Methods: Calculations were conducted using ORIGEN code with the neutron databases of THERMAL.LIB, BWRU.LIB, CANDUSEU.LIB and PWRU.LIB as input. Results: It was found that, with the same neutron spectrum, neutron flux and running time, the production of xenon is about 7 times of that of krypton in the UO2 coated particles, and about 4.5 times in the ThO2 coated particles. For the ThO2 coated particles, both xenon and krypton reach saturation earlier when the neutron spectrum are softer, and the saturation values are smaller compared with those in the harder spectrum environment. Conclusion: Taking the fission product gas accumulation as the main factor of TRISO coated particles, the calculation implies that the ThO2 coated particles can have a longer lifetime than the UO2 coated particles under the same neutron environment.

Key words: TRISO (Tri-structural iso-tropic) coated fuel particles, Fission product gas, Neutron spectrum, Neutron flux