Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (2): 20603-020603.doi: 10.11889/j.0253-3219.2020.hjs.43.020603


Preliminary study on the fast solution strategy of hexagonal nodal neutron transport calculation program

Wenyong XIA,Tengfei ZHANG(),Xiaojing LIU,Jinbiao XIONG,Xiang CHAI   

  1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2019-10-09 Revised:2019-12-04 Online:2020-02-15 Published:2020-02-24
  • Contact: Tengfei ZHANG
  • Supported by:
    National Natural Science Foundation of China(11805122)

Abstract: Background

Computational time and calculation accuracy are key features of the application of neutron transfer method.


This paper aims to reduce the computational time on the premise of ensuring the accuracy of calculation.


Based on a neutron transport calculation program for hexagonal nodal, a fast solution method was proposed to solve the 1/6 core is solved with 60° periodic symmetric boundary conditions, and calculated in parallel. The natural decoupling between the response matrices corresponding to different energy groups and nodes, and the parallelism between non-overlapping spatial regions was taken into account to solve the response matrix equation. Based on message passing interface (MPI), parallel program of the response matrix construction was developed to solve the matrix equation. Calibration calculation for the TAKEDA4 benchmark was carried out by parallel computing.


The computational results show that the 60° periodic symmetric boundary condition and the parallel computing function can greatly improve the computational efficiency while ensuring the same calculation accuracy, and verify the correctness of the fast solution strategy. Compared with the full core serial calculation, the total calculation time overhead of the 1/6 core under 9 processors can be reduced by 26, 25, and 22 times under P1, P3, and P5, respectively.


A quick solution for hexagonal nodes is initially achieved.

Key words: Variational nodal method, 60° periodic symmetric, MPI parallel

CLC Number: 

  • TL325