Nuclear Engineering and Technology

  • 제55권12호
  • /
  • Pages.4597-4606
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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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Realistic thermal analysis of the CANDU spent fuel dry storage canister

  • Tae Gang Lee (School of Mechanical Engineering, Pusan National University) ;
  • Taehyeon Kim (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd) ;
  • Taehyung Na (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd) ;
  • Byongjo Yun (School of Mechanical Engineering, Pusan National University) ;
  • Jae Jun Jeong (School of Mechanical Engineering, Pusan National University)
  • 투고 : 2023.05.08
  • 심사 : 2023.08.25
  • 발행 : 2023.12.25
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초록

Thermal analysis of the CANDU spent fuel dry storage canister is very important to ensure the integrity of the spent fuel. The analyses have been conducted using a conservative approach, with a particular focus on the peak cladding temperature (PCT) of the fuel rods in the canister. In this study, we have performed a realistic thermal analysis using a computational fluid dynamics (CFD) code. The canister contains 9 fuel bundle baskets. A detailed analysis of even a single basket requires significant computational resources. To overcome this challenge, we replaced each basket with an equivalent heat conductor (EHC), of which effective thermal conductivity (ETC) is developed from the results of detailed CFD calculations of a fuel bundle basket. Then, we investigated the effects of some conservative models, ultimately aiming at a realistic analysis. The results revealed: (i) The influence of convective heat transfer in the basket cannot be ignored, but it's less significant than expected. (ii) Modeling of the lifting rod is crucial, as it plays a decisive role in axial heat transfer at the center of the canister and significantly reduces the PCT. (iii) Convection within the canister is very important, as it not only reduces the PCT but also shifts its location upwards.

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과제정보

This work was supported by the Institute of Korea Spent Nuclear Fuel grant funded by the Ministry of Trade, Industry and Energy of the Korea government (2021040101002C).

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