Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Neutronics modelling of control rod compensation operation in small modular fast reactor using OpenMC

  • Guo, Hui (School of Nuclear Science and Engineering, Shanghai Jiao Tong University) ;
  • Peng, Xingjie (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China) ;
  • Wu, Yiwei (School of Nuclear Science and Engineering, Shanghai Jiao Tong University) ;
  • Jin, Xin (School of Nuclear Science and Engineering, Shanghai Jiao Tong University) ;
  • Feng, Kuaiyuan (School of Nuclear Science and Engineering, Shanghai Jiao Tong University) ;
  • Gu, Hanyang (School of Nuclear Science and Engineering, Shanghai Jiao Tong University)
  • Received : 2021.04.15
  • Accepted : 2021.09.17
  • Published : 2022.03.25
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Abstract

The small modular liquid-metal fast reactor (SMFR) is an important component of advanced nuclear systems. SMFRs exhibit relatively low breeding capability and constraint space for control rod installation. Consequently, control rods are deeply inserted at beginning and are withdrawn gradually to compensate for large burnup reactivity loss in a long lifetime. This paper is committed to investigating the impact of control rod compensation operation on core neutronics characteristics. This paper presents a whole core fine depletion model of long lifetime SMFR using OpenMC and the influence of depletion chains is verified. Three control rod position schemes to simulate the compensation process are compared. The results show that the fine simulation of the control rod compensation process impacts significantly the fuel burnup distribution and absorber consumption. A control rod equivalent position scheme proposed in this work is an optimal option in the trade-off between computation time and accuracy. The control position is crucial for accurate power distribution and void feedback coefficients in SMFRs. The results in this paper also show that the pin level power distribution is important due to the heterogeneous distribution in SMFRs. The fuel burnup distribution at the end of core life impacts the worth of control rods.

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Acknowledgement

This work is sponsored by Shanghai Sailing Program (No. 20YF1420700). The computations in this paper were run on the π 2.0 cluster supported by the Center for High-Performance Computing at Shanghai Jiao Tong University.

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