Nuclear Engineering and Technology

  • 제55권9호
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  • Pages.3450-3463
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  • 2023
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Homogenized cross-section generation for pebble-bed type high-temperature gas-cooled reactor using NECP-MCX

  • Shuai Qin (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Yunzhao Li (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Qingming He (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Liangzhi Cao (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Yongping Wang (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Yuxuan Wu (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Hongchun Wu (School of Nuclear Science and Technology, Xi'an Jiaotong University)
  • 투고 : 2023.03.12
  • 심사 : 2023.05.22
  • 발행 : 2023.09.25
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초록

In the two-step analysis of Pebble-Bed type High-Temperature Gas-Cooled Reactor (PB-HTGR), the lattice physics calculation for the generation of homogenized cross-sections is based on the fuel pebble. However, the randomly-dispersed fuel particles in the fuel pebble introduce double heterogeneity and randomness. Compared to the deterministic method, the Monte Carlo method which is flexible in geometry modeling provides a high-fidelity treatment. Therefore, the Monte Carlo code NECP-MCX is extended in this study to perform the lattice physics calculation of the PB-HTGR. Firstly, the capability for the simulation of randomly-dispersed media, using the explicit modeling approach, is developed in NECP-MCX. Secondly, the capability for the generation of the homogenized cross-section is also developed in NECP-MCX. Finally, simplified PB-HTGR problems are calculated by a two-step neutronics analysis tool based on Monte Carlo homogenization. For the pebble beds mixed by fuel pebble and graphite pebble, the bias is less than 100 pcm when compared to the high-fidelity model, and the bias is increased to 269 pcm for pebble bed mixed by depleted fuel pebble. Numerical results show that the Monte Carlo lattice physics calculation for the two-step analysis of PB-HTGR is feasible.

키워드

과제정보

This work is financially supported by the National Natural Science Foundation of China (U2067209), the Young Elite Scientists Sponsorship Program by CAST (2019QNRC001) and the Innovative Scientific Program of CNNC.

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