Nuclear Engineering and Technology

  • 제54권12호
  • /
  • Pages.4722-4730
  • /
  • 2022
  • /
  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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A spent nuclear fuel source term calculation code BESNA with a new modified predictor-corrector scheme

  • Duy Long Ta (Department of Nuclear Engineering, Hanyang University) ;
  • Ser Gi Hong (Department of Nuclear Engineering, Hanyang University) ;
  • Dae Sik Yook (Korea Institute of Nuclear Safety (KINS))
  • 투고 : 2022.04.12
  • 심사 : 2022.07.18
  • 발행 : 2022.12.25
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초록

This paper introduces a new point depletion-based source term calculation code named BESNA (Bateman Equation Solver for Nuclear Applications), which is aimed to estimate nuclide inventories and source terms from spent nuclear fuels. The BESNA code employs a new modified CE/CM (Constant Extrapolation - Constant Midpoint) predictor-corrector scheme in depletion calculations for improving computational efficiency. In this modified CE/CM scheme, the decay components leading to the large norm of the depletion matrix are excluded in the corrector, and hence the corrector calculation involves only the reaction components, which can be efficiently solved with the Talyor Expansion Method (TEM). The numerical test shows that the new scheme substantially reduces computing time without loss of accuracy in comparison with the conventional scheme using CRAM (Chebyshev Rational Approximation Method), especially when the substep calculations are applied. The depletion calculation and source term estimation capability of BESNA are verified and validated through several problems, where results from BESNA are compared with those calculated by other codes as well as measured data. The analysis results show the computational efficiency of the new modified scheme and the reliability of BESNA in both isotopic predictions and source term estimations.

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과제정보

This work was supported by the NRF (National Research Foundation of Korea) through Project No. NRF-2019M2D2A1A02057890 and by the Korea Institute of Nuclear Safety (KINS).

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