Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (8): 80004-080004.doi: 10.11889/j.0253-3219.2020.hjs.43.080004

• SPECIAL SECTION ON THE 11TH NATIONAL CONFERENCE ON NEW AND RESEARCH REACTORS (PART III) • Previous Articles     Next Articles

Research of the RPT method on double-heterogeneity of accident tolerance fuel

Lei LOU,Dong YAO,Xiaoming CHAI(),Yingrui YU,Lianjie WANG,Xingjie WANG Chenlin PENG,Yunli XIE,Yong LIU,Peng XIAO   

  1. National Key Laboratory of Science and Technology on Reactor System Design Technology, Nuclear Power Institute of China, Chengdu 610213, China
  • Received:2020-03-09 Revised:2020-05-25 Online:2020-08-15 Published:2020-08-12
  • Contact: Xiaoming CHAI E-mail:chaixm@163.com
  • About author:LOU Lei, male, born in 1988, graduated from Xi'an Jiaotong University with a master's degree in 2012, engaged in physics research reactor
  • Supported by:
    National Natural Science Foundation of China(1170051016);Youth Foundation of Sichuan province(2016JQ0045)

Abstract: Background

The traditional volumetric homogenization method (VHM) for the calculation of double heterogeneous system with dispersed particle fuel or burnable poison will bring a certain calculation deviation.

Purpose

This study aims to explore the traditional reactivity-equivalent physical transformation (RPT) method applied to the calculation of infinite neutron multiplication factor (kinf) for the accident tolerance fuel.

Methods

First of all, grid cell containing B4C poison particles in grain model (GM) and VHM model was built to calculate and compare the variation of kinf. Then, the RPT method was employed to treat dispersed particle-type fuel and dispersed particle-type burnable poisons. Finally, a new RPT method with assumption that all the fuel particles were sealed in an annular region in the matrix with the same center of the pellet was implemented to calculate kinf for various accident tolerance fuel.

Results

Comparison results show that the new RPT method not only can treat dispersed fuel particles and burnable particles with similar effect of traditional RPT, but also suits for strong absorber dispersed particle-type burnable poisons that the traditional RPT method is ineffective.

Conclusions

The new RPT method can solve the double non-uniformity problem of dispersed fuel and dispersed burnable poison, providing ideas and reference for the expansion of RPT method to strong absorber dispersed particle-type burnable poisons.

Key words: Accident tolerance fuel, Double-heterogeneity, Traditional RPT method, New RPT method

CLC Number: 

  • TL3