Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (6): 60001-060001.doi: 10.11889/j.0253-3219.2020.hjs.43.060001

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

Evaluation of super homogenization method for pin-by-pin core calculation

Bin ZHANG1,2,Yunzhao LI2,Hongchun WU2   

  1. 1.Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China
    2.School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2020-03-17 Revised:2020-03-24 Online:2020-06-15 Published:2020-06-12
  • About author:ZHANG Bin, male, born in 1989, graduated from Xi'an Jiaotong University with a doctoral degree in 2017, focusing on reactor physical design
  • Supported by:
    National Natural Science Foundation of China(11775171)

Abstract: Background

The new generation of pin-by-pin calculation method has gradually become the state-of-the-art approaches along with the improvement of computer technology and the development of core design.The difference between the pin-by-pin calculation and the traditional two-step scheme leads to the homogenization technique difficult to implement.

Purpose

This study aims to evaluate super homogenization techniques for pin-by-pin core calculationwith emphasis on equivalent homogenization constants.

Methods

Super homogenization method was used as one of the main homogenization techniques of pin-by-pin calculation. For fuel assembly, the traditional super homogenization method was employed to generate the group constants. For reflector assembly with neutron leakage, the super homogenization method related to space leakage was applied to the generation of equivalent homogenization constant including super homogenization factor.

Results

Based on the three-dimensional C5G7 benchmark, the application performance of the super homogenization method in pin-by-pin calculation is evaluated. The eigen-value relative error of pin-by-pin calculation is -0.001 6, assembly-power and pin-power relative errors are less than 5.5%.

Conclusions

Numerical results showed that the pin-by-pin calculations have the higher accuracy than the assembly-homogenized results.

Key words: Pin-by-pin calculation, Super homogenization method, Group constants, C5G7 benchmark

CLC Number: 

  • TL99