Nuclear Engineering and Technology

  • 제56권2호
  • /
  • Pages.673-684
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  • 2024
  • /
  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Modelling atomic relaxation and bremsstrahlung in the deterministic code STREAM

  • Nhan Nguyen Trong Mai (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Kyeongwon Kim (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Deokjung Lee (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology)
  • 투고 : 2023.08.10
  • 심사 : 2023.11.02
  • 발행 : 2024.02.25
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초록

STREAM, developed by the Computational Reactor Physics and Experiment laboratory (CORE) of the Ulsan National Institute of Science and Technology (UNIST), is a deterministic neutron- and photon-transport code primarily designed for light water reactor (LWR) analysis. Initially, the photon module in STREAM did not account for fluorescence and bremsstrahlung photons. This article presents recent developments regarding the integration of atomic relaxation and bremsstrahlung models into the existing photon module, thus allowing for the transport of secondary photons. The photon flux and photon heating computed with the newly incorporated models is compared to results obtained with the Monte Carlo code MCS. The incorporation of secondary photons has substantially improved the accuracy of photon flux calculations, particularly in scenarios involving strong gamma emitters. However, it is essential to note that despite the consideration of secondary photon sources, there is no noticeable improvement in the photon heating for LWR problems when compared to the photon heating obtained with the previous version of STREAM.

키워드

과제정보

This work was partially supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2019M2D2A1A03058371). This work was also partially supported by Korea Hydro & Nuclear Power Co., Ltd (No. A22LP10).

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