Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (1): 10602-010602.doi: 10.11889/j.0253-3219.2019.hjs.42.010602

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Real-time simulation of 3D reactor core based on nonlinear iteration method

Xinhui DUAN1,2,Bingshu WANG1,Ping JIANG3   

  1. 1. North China Electric Power University, Baoding 071003, China
    2. Baoding Sinosimu Technology Co. Ltd, Baoding 071051, China
    3. Hebei University, Baoding 071002, China
  • Received:2018-09-13 Revised:2018-12-08 Online:2019-01-10 Published:2019-01-25
  • Supported by:
    Supported by Innovation Fund for Technology-based SMEs (No.11C26211304067)

Abstract: Background

The functions on full scope simulator of nuclear power plant have developed from simple operator training and examination to the addition of the analysis of malfunction and safety. Therefore, the higher requirements are put forward from two aspects of precision and speed.


This study aims to improve calculation precision and speed of two group transient neutron diffusion equations by using the nonlinear iteration method (NIM) for 3D reactor core modeling.


First of all, the flux and power of neutron are calculated in real-time using the coarse mesh finite difference method (CMFD). The couple parameters of CMFD are updated in real-time by the NIM. Then the coupled correction factor is calculated by nodal expansion method (NEM), and the dynamic group parameters are corrected in real-time to decrease the control rod cusping effect. Finally, the three-dimensional reactor core real-time simulation code is developed and verified by the typical benchmark examples, and the real-time simulation mesh spacing and convergence criterion are suggested and tested.


Results show that the NIM combines the advantages both on high precision of NEM and fast speed of CMFD. The dynamic group parameters correction (DXS) can prompt the accuracy at the coarse cell and large time step.


In the development process on full scope simulator of nuclear power plant, NIM can effectively solve the high precision and real-time balancing problem of three dimensional reactor core transient simulation model.

Key words: Nonlinear iteration, Corrected coupling factor, Reactor transient, Real-time simulation

CLC Number: 

  • TL329